diff options
| author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
| commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
| tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/v850/kernel | |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/v850/kernel')
57 files changed, 9573 insertions, 0 deletions
diff --git a/arch/v850/kernel/Makefile b/arch/v850/kernel/Makefile new file mode 100644 index 00000000000..3930482bddc --- /dev/null +++ b/arch/v850/kernel/Makefile @@ -0,0 +1,40 @@ +# +# arch/v850/kernel/Makefile +# +# Copyright (C) 2001,02,03 NEC Electronics Corporation +# Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> +# +# This file is subject to the terms and conditions of the GNU General Public +# License. See the file "COPYING" in the main directory of this archive +# for more details. +# + +extra-y := head.o init_task.o vmlinux.lds + +obj-y += intv.o entry.o process.o syscalls.o time.o semaphore.o setup.o \ + signal.o irq.o mach.o ptrace.o bug.o +obj-$(CONFIG_MODULES) += module.o v850_ksyms.o +# chip-specific code +obj-$(CONFIG_V850E_MA1) += ma.o +obj-$(CONFIG_V850E_ME2) += me2.o +obj-$(CONFIG_V850E_TEG) += teg.o +obj-$(CONFIG_V850E_AS85EP1) += as85ep1.o +obj-$(CONFIG_V850E2_ANNA) += anna.o +# platform-specific code +obj-$(CONFIG_V850E_SIM) += sim.o simcons.o +obj-$(CONFIG_V850E2_SIM85E2) += sim85e2.o memcons.o +obj-$(CONFIG_V850E2_FPGA85E2C) += fpga85e2c.o memcons.o +obj-$(CONFIG_RTE_CB) += rte_cb.o rte_cb_leds.o +obj-$(CONFIG_RTE_CB_MA1) += rte_ma1_cb.o +obj-$(CONFIG_RTE_CB_ME2) += rte_me2_cb.o +obj-$(CONFIG_RTE_CB_NB85E) += rte_nb85e_cb.o +obj-$(CONFIG_RTE_CB_MULTI) += rte_cb_multi.o +obj-$(CONFIG_RTE_MB_A_PCI) += rte_mb_a_pci.o +obj-$(CONFIG_RTE_GBUS_INT) += gbus_int.o +# feature-specific code +obj-$(CONFIG_V850E_INTC) += v850e_intc.o +obj-$(CONFIG_V850E_TIMER_D) += v850e_timer_d.o v850e_utils.o +obj-$(CONFIG_V850E_CACHE) += v850e_cache.o +obj-$(CONFIG_V850E2_CACHE) += v850e2_cache.o +obj-$(CONFIG_V850E_HIGHRES_TIMER) += highres_timer.o +obj-$(CONFIG_PROC_FS) += procfs.o diff --git a/arch/v850/kernel/anna-rom.ld b/arch/v850/kernel/anna-rom.ld new file mode 100644 index 00000000000..7c54e7e3f1b --- /dev/null +++ b/arch/v850/kernel/anna-rom.ld @@ -0,0 +1,16 @@ +/* Linker script for the Midas labs Anna V850E2 evaluation board + (CONFIG_V850E2_ANNA), with kernel in ROM (CONFIG_ROM_KERNEL). */ + +MEMORY { + /* 8MB of flash ROM. */ + ROM : ORIGIN = 0, LENGTH = 0x00800000 + + /* 1MB of static RAM. This memory is mirrored 64 times. */ + SRAM : ORIGIN = SRAM_ADDR, LENGTH = SRAM_SIZE + /* 64MB of DRAM. */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +SECTIONS { + ROMK_SECTIONS(ROM, SRAM) +} diff --git a/arch/v850/kernel/anna.c b/arch/v850/kernel/anna.c new file mode 100644 index 00000000000..6aaeab5e8a4 --- /dev/null +++ b/arch/v850/kernel/anna.c @@ -0,0 +1,208 @@ +/* + * arch/v850/kernel/anna.c -- Anna V850E2 evaluation chip/board + * + * Copyright (C) 2002,03 NEC Electronics Corporation + * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/major.h> +#include <linux/irq.h> + +#include <asm/machdep.h> +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/v850e_timer_d.h> +#include <asm/v850e_uart.h> + +#include "mach.h" + + +/* SRAM and SDRAM are vaguely contiguous (with a big hole in between; see + mach_reserve_bootmem for details); use both as one big area. */ +#define RAM_START SRAM_ADDR +#define RAM_END (SDRAM_ADDR + SDRAM_SIZE) + +/* The bits of this port are connected to an 8-LED bar-graph. */ +#define LEDS_PORT 0 + + +static void anna_led_tick (void); + + +void __init mach_early_init (void) +{ + ANNA_ILBEN = 0; + + V850E2_CSC(0) = 0x402F; + V850E2_CSC(1) = 0x4000; + V850E2_BPC = 0; + V850E2_BSC = 0xAAAA; + V850E2_BEC = 0; + +#if 0 + V850E2_BHC = 0xFFFF; /* icache all memory, dcache all */ +#else + V850E2_BHC = 0; /* cache no memory */ +#endif + V850E2_BCT(0) = 0xB088; + V850E2_BCT(1) = 0x0008; + V850E2_DWC(0) = 0x0027; + V850E2_DWC(1) = 0; + V850E2_BCC = 0x0006; + V850E2_ASC = 0; + V850E2_LBS = 0x0089; + V850E2_SCR(3) = 0x21A9; + V850E2_RFS(3) = 0x8121; + + v850e_intc_disable_irqs (); +} + +void __init mach_setup (char **cmdline) +{ + ANNA_PORT_PM (LEDS_PORT) = 0; /* Make all LED pins output pins. */ + mach_tick = anna_led_tick; +} + +void __init mach_get_physical_ram (unsigned long *ram_start, + unsigned long *ram_len) +{ + *ram_start = RAM_START; + *ram_len = RAM_END - RAM_START; +} + +void __init mach_reserve_bootmem () +{ + /* The space between SRAM and SDRAM is filled with duplicate + images of SRAM. Prevent the kernel from using them. */ + reserve_bootmem (SRAM_ADDR + SRAM_SIZE, + SDRAM_ADDR - (SRAM_ADDR + SRAM_SIZE)); +} + +void mach_gettimeofday (struct timespec *tv) +{ + tv->tv_sec = 0; + tv->tv_nsec = 0; +} + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* Start hardware timer. */ + v850e_timer_d_configure (0, HZ); + /* Install timer interrupt handler. */ + setup_irq (IRQ_INTCMD(0), timer_action); +} + +static struct v850e_intc_irq_init irq_inits[] = { + { "IRQ", 0, NUM_MACH_IRQS, 1, 7 }, + { "PIN", IRQ_INTP(0), IRQ_INTP_NUM, 1, 4 }, + { "CCC", IRQ_INTCCC(0), IRQ_INTCCC_NUM, 1, 5 }, + { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 }, + { "DMA", IRQ_INTDMA(0), IRQ_INTDMA_NUM, 1, 2 }, + { "DMXER", IRQ_INTDMXER,1, 1, 2 }, + { "SRE", IRQ_INTSRE(0), IRQ_INTSRE_NUM, 3, 3 }, + { "SR", IRQ_INTSR(0), IRQ_INTSR_NUM, 3, 4 }, + { "ST", IRQ_INTST(0), IRQ_INTST_NUM, 3, 5 }, + { 0 } +}; +#define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1) + +static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS]; + +void __init mach_init_irqs (void) +{ + v850e_intc_init_irq_types (irq_inits, hw_itypes); +} + +void machine_restart (char *__unused) +{ +#ifdef CONFIG_RESET_GUARD + disable_reset_guard (); +#endif + asm ("jmp r0"); /* Jump to the reset vector. */ +} + +EXPORT_SYMBOL(machine_restart); + +void machine_halt (void) +{ +#ifdef CONFIG_RESET_GUARD + disable_reset_guard (); +#endif + local_irq_disable (); /* Ignore all interrupts. */ + ANNA_PORT_IO(LEDS_PORT) = 0xAA; /* Note that we halted. */ + for (;;) + asm ("halt; nop; nop; nop; nop; nop"); +} + +EXPORT_SYMBOL(machine_halt); + +void machine_power_off (void) +{ + machine_halt (); +} + +EXPORT_SYMBOL(machine_power_off); + +/* Called before configuring an on-chip UART. */ +void anna_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud) +{ + /* The Anna connects some general-purpose I/O pins on the CPU to + the RTS/CTS lines of UART 1's serial connection. I/O pins P07 + and P37 are RTS and CTS respectively. */ + if (chan == 1) { + ANNA_PORT_PM(0) &= ~0x80; /* P07 in output mode */ + ANNA_PORT_PM(3) |= 0x80; /* P37 in input mode */ + } +} + +/* Minimum and maximum bounds for the moving upper LED boundary in the + clock tick display. We can't use the last bit because it's used for + UART0's CTS output. */ +#define MIN_MAX_POS 0 +#define MAX_MAX_POS 6 + +/* There are MAX_MAX_POS^2 - MIN_MAX_POS^2 cycles in the animation, so if + we pick 6 and 0 as above, we get 49 cycles, which is when divided into + the standard 100 value for HZ, gives us an almost 1s total time. */ +#define TICKS_PER_FRAME \ + (HZ / (MAX_MAX_POS * MAX_MAX_POS - MIN_MAX_POS * MIN_MAX_POS)) + +static void anna_led_tick () +{ + static unsigned counter = 0; + + if (++counter == TICKS_PER_FRAME) { + static int pos = 0, max_pos = MAX_MAX_POS, dir = 1; + + if (dir > 0 && pos == max_pos) { + dir = -1; + if (max_pos == MIN_MAX_POS) + max_pos = MAX_MAX_POS; + else + max_pos--; + } else { + if (dir < 0 && pos == 0) + dir = 1; + + if (pos + dir <= max_pos) { + /* Each bit of port 0 has a LED. */ + clear_bit (pos, &ANNA_PORT_IO(LEDS_PORT)); + pos += dir; + set_bit (pos, &ANNA_PORT_IO(LEDS_PORT)); + } + } + + counter = 0; + } +} diff --git a/arch/v850/kernel/anna.ld b/arch/v850/kernel/anna.ld new file mode 100644 index 00000000000..df7f80f2833 --- /dev/null +++ b/arch/v850/kernel/anna.ld @@ -0,0 +1,20 @@ +/* Linker script for the Midas labs Anna V850E2 evaluation board + (CONFIG_V850E2_ANNA). */ + +MEMORY { + /* 256KB of internal memory (followed by one mirror). */ + iMEM0 : ORIGIN = 0, LENGTH = 0x00040000 + /* 256KB of internal memory (followed by one mirror). */ + iMEM1 : ORIGIN = 0x00040000, LENGTH = 0x00040000 + + /* 1MB of static RAM. This memory is mirrored 64 times. */ + SRAM : ORIGIN = SRAM_ADDR, LENGTH = SRAM_SIZE + /* 64MB of DRAM. */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +SECTIONS { + .intv : { INTV_CONTENTS } > iMEM0 + .sram : { RAMK_KRAM_CONTENTS } > SRAM + .root : { ROOT_FS_CONTENTS } > SDRAM +} diff --git a/arch/v850/kernel/as85ep1-rom.ld b/arch/v850/kernel/as85ep1-rom.ld new file mode 100644 index 00000000000..fe2a9a3ab52 --- /dev/null +++ b/arch/v850/kernel/as85ep1-rom.ld @@ -0,0 +1,21 @@ +/* Linker script for the NEC AS85EP1 V850E evaluation board + (CONFIG_V850E_AS85EP1), with kernel in ROM (CONFIG_ROM_KERNEL). */ + +MEMORY { + /* 4MB of flash ROM. */ + ROM : ORIGIN = 0, LENGTH = 0x00400000 + + /* 1MB of static RAM. */ + SRAM : ORIGIN = SRAM_ADDR, LENGTH = SRAM_SIZE + + /* About 58MB of DRAM. This can actually be at one of two + positions, determined by jumper JP3; we have to use the first + position because the second is partially out of processor + instruction addressing range (though in the second position + there's actually 64MB available). */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +SECTIONS { + ROMK_SECTIONS(ROM, SRAM) +} diff --git a/arch/v850/kernel/as85ep1.c b/arch/v850/kernel/as85ep1.c new file mode 100644 index 00000000000..4059b1df11b --- /dev/null +++ b/arch/v850/kernel/as85ep1.c @@ -0,0 +1,240 @@ +/* + * arch/v850/kernel/as85ep1.c -- AS85EP1 V850E evaluation chip/board + * + * Copyright (C) 2002,03 NEC Electronics Corporation + * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/major.h> +#include <linux/irq.h> + +#include <asm/machdep.h> +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/v850e_timer_d.h> +#include <asm/v850e_uart.h> + +#include "mach.h" + + +/* SRAM and SDRAM are vaguely contiguous (with a big hole in between; see + mach_reserve_bootmem for details); use both as one big area. */ +#define RAM_START SRAM_ADDR +#define RAM_END (SDRAM_ADDR + SDRAM_SIZE) + +/* The bits of this port are connected to an 8-LED bar-graph. */ +#define LEDS_PORT 4 + + +static void as85ep1_led_tick (void); + +extern char _intv_copy_src_start, _intv_copy_src_end; +extern char _intv_copy_dst_start; + + +void __init mach_early_init (void) +{ +#ifndef CONFIG_ROM_KERNEL + const u32 *src; + register u32 *dst asm ("ep"); +#endif + + AS85EP1_CSC(0) = 0x0403; + AS85EP1_BCT(0) = 0xB8B8; + AS85EP1_DWC(0) = 0x0104; + AS85EP1_BCC = 0x0012; + AS85EP1_ASC = 0; + AS85EP1_LBS = 0x00A9; + + AS85EP1_PORT_PMC(6) = 0xFF; /* valid A0,A1,A20-A25 */ + AS85EP1_PORT_PMC(7) = 0x0E; /* valid CS1-CS3 */ + AS85EP1_PORT_PMC(9) = 0xFF; /* valid D16-D23 */ + AS85EP1_PORT_PMC(10) = 0xFF; /* valid D24-D31 */ + + AS85EP1_RFS(1) = 0x800c; + AS85EP1_RFS(3) = 0x800c; + AS85EP1_SCR(1) = 0x20A9; + AS85EP1_SCR(3) = 0x20A9; + +#ifndef CONFIG_ROM_KERNEL + /* The early chip we have is buggy, and writing the interrupt + vectors into low RAM may screw up, so for non-ROM kernels, we + only rely on the reset vector being downloaded, and copy the + rest of the interrupt vectors into place here. The specific bug + is that writing address N, where (N & 0x10) == 0x10, will _also_ + write to address (N - 0x10). We avoid this (effectively) by + writing in 16-byte chunks backwards from the end. */ + + AS85EP1_IRAMM = 0x3; /* "write-mode" for the internal instruction memory */ + + src = (u32 *)(((u32)&_intv_copy_src_end - 1) & ~0xF); + dst = (u32 *)&_intv_copy_dst_start + + (src - (u32 *)&_intv_copy_src_start); + do { + u32 t0 = src[0], t1 = src[1], t2 = src[2], t3 = src[3]; + dst[0] = t0; dst[1] = t1; dst[2] = t2; dst[3] = t3; + dst -= 4; + src -= 4; + } while (src > (u32 *)&_intv_copy_src_start); + + AS85EP1_IRAMM = 0x0; /* "read-mode" for the internal instruction memory */ +#endif /* !CONFIG_ROM_KERNEL */ + + v850e_intc_disable_irqs (); +} + +void __init mach_setup (char **cmdline) +{ + AS85EP1_PORT_PMC (LEDS_PORT) = 0; /* Make the LEDs port an I/O port. */ + AS85EP1_PORT_PM (LEDS_PORT) = 0; /* Make all the bits output pins. */ + mach_tick = as85ep1_led_tick; +} + +void __init mach_get_physical_ram (unsigned long *ram_start, + unsigned long *ram_len) +{ + *ram_start = RAM_START; + *ram_len = RAM_END - RAM_START; +} + +/* Convenience macros. */ +#define SRAM_END (SRAM_ADDR + SRAM_SIZE) +#define SDRAM_END (SDRAM_ADDR + SDRAM_SIZE) + +void __init mach_reserve_bootmem () +{ + if (SDRAM_ADDR < RAM_END && SDRAM_ADDR > RAM_START) + /* We can't use the space between SRAM and SDRAM, so + prevent the kernel from trying. */ + reserve_bootmem (SRAM_END, SDRAM_ADDR - SRAM_END); +} + +void mach_gettimeofday (struct timespec *tv) +{ + tv->tv_sec = 0; + tv->tv_nsec = 0; +} + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* Start hardware timer. */ + v850e_timer_d_configure (0, HZ); + /* Install timer interrupt handler. */ + setup_irq (IRQ_INTCMD(0), timer_action); +} + +static struct v850e_intc_irq_init irq_inits[] = { + { "IRQ", 0, NUM_MACH_IRQS, 1, 7 }, + { "CCC", IRQ_INTCCC(0), IRQ_INTCCC_NUM, 1, 5 }, + { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 }, + { "SRE", IRQ_INTSRE(0), IRQ_INTSRE_NUM, 3, 3 }, + { "SR", IRQ_INTSR(0), IRQ_INTSR_NUM, 3, 4 }, + { "ST", IRQ_INTST(0), IRQ_INTST_NUM, 3, 5 }, + { 0 } +}; +#define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1) + +static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS]; + +void __init mach_init_irqs (void) +{ + v850e_intc_init_irq_types (irq_inits, hw_itypes); +} + +void machine_restart (char *__unused) +{ +#ifdef CONFIG_RESET_GUARD + disable_reset_guard (); +#endif + asm ("jmp r0"); /* Jump to the reset vector. */ +} + +EXPORT_SYMBOL(machine_restart); + +void machine_halt (void) +{ +#ifdef CONFIG_RESET_GUARD + disable_reset_guard (); +#endif + local_irq_disable (); /* Ignore all interrupts. */ + AS85EP1_PORT_IO (LEDS_PORT) = 0xAA; /* Note that we halted. */ + for (;;) + asm ("halt; nop; nop; nop; nop; nop"); +} + +EXPORT_SYMBOL(machine_halt); + +void machine_power_off (void) +{ + machine_halt (); +} + +EXPORT_SYMBOL(machine_power_off); + +/* Called before configuring an on-chip UART. */ +void as85ep1_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud) +{ + /* Make the shared uart/port pins be uart pins. */ + AS85EP1_PORT_PMC(3) |= (0x5 << chan); + + /* The AS85EP1 connects some general-purpose I/O pins on the CPU to + the RTS/CTS lines of UART 1's serial connection. I/O pins P53 + and P54 are RTS and CTS respectively. */ + if (chan == 1) { + /* Put P53 & P54 in I/O port mode. */ + AS85EP1_PORT_PMC(5) &= ~0x18; + /* Make P53 an output, and P54 an input. */ + AS85EP1_PORT_PM(5) |= 0x10; + } +} + +/* Minimum and maximum bounds for the moving upper LED boundary in the + clock tick display. */ +#define MIN_MAX_POS 0 +#define MAX_MAX_POS 7 + +/* There are MAX_MAX_POS^2 - MIN_MAX_POS^2 cycles in the animation, so if + we pick 6 and 0 as above, we get 49 cycles, which is when divided into + the standard 100 value for HZ, gives us an almost 1s total time. */ +#define TICKS_PER_FRAME \ + (HZ / (MAX_MAX_POS * MAX_MAX_POS - MIN_MAX_POS * MIN_MAX_POS)) + +static void as85ep1_led_tick () +{ + static unsigned counter = 0; + + if (++counter == TICKS_PER_FRAME) { + static int pos = 0, max_pos = MAX_MAX_POS, dir = 1; + + if (dir > 0 && pos == max_pos) { + dir = -1; + if (max_pos == MIN_MAX_POS) + max_pos = MAX_MAX_POS; + else + max_pos--; + } else { + if (dir < 0 && pos == 0) + dir = 1; + + if (pos + dir <= max_pos) { + /* Each bit of port 0 has a LED. */ + set_bit (pos, &AS85EP1_PORT_IO(LEDS_PORT)); + pos += dir; + clear_bit (pos, &AS85EP1_PORT_IO(LEDS_PORT)); + } + } + + counter = 0; + } +} diff --git a/arch/v850/kernel/as85ep1.ld b/arch/v850/kernel/as85ep1.ld new file mode 100644 index 00000000000..ef2c4399063 --- /dev/null +++ b/arch/v850/kernel/as85ep1.ld @@ -0,0 +1,49 @@ +/* Linker script for the NEC AS85EP1 V850E evaluation board + (CONFIG_V850E_AS85EP1). */ + +MEMORY { + /* 1MB of internal instruction memory. */ + iMEM0 : ORIGIN = 0, LENGTH = 0x00100000 + + /* 1MB of static RAM. */ + SRAM : ORIGIN = SRAM_ADDR, LENGTH = SRAM_SIZE + + /* About 58MB of DRAM. This can actually be at one of two + positions, determined by jump JP3; we have to use the first + position because the second is partially out of processor + instruction addressing range (though in the second position + there's actually 64MB available). */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +SECTIONS { + .resetv : { + __intv_start = . ; + *(.intv.reset) /* Reset vector */ + } > iMEM0 + + .sram : { + RAMK_KRAM_CONTENTS + + /* We stick most of the interrupt vectors here; they'll be + copied into the proper location by the early init code (we + can't put them directly in the right place because of + hardware bugs). The vectors shouldn't need to be + relocated, so we don't have to use `> ... AT> ...' to + split the load/vm addresses (and we can't because of + problems with the loader). */ + . = ALIGN (0x10) ; + __intv_copy_src_start = . ; + *(.intv.common) /* Vectors common to all v850e proc. */ + *(.intv.mach) /* Machine-specific int. vectors. */ + . = ALIGN (0x10) ; + __intv_copy_src_end = . ; + } > SRAM + + /* Where we end up putting the vectors. */ + __intv_copy_dst_start = 0x10 ; + __intv_copy_dst_end = __intv_copy_dst_start + (__intv_copy_src_end - __intv_copy_src_start) ; + __intv_end = __intv_copy_dst_end ; + + .root : { ROOT_FS_CONTENTS } > SDRAM +} diff --git a/arch/v850/kernel/asm-consts.c b/arch/v850/kernel/asm-consts.c new file mode 100644 index 00000000000..24f29136907 --- /dev/null +++ b/arch/v850/kernel/asm-consts.c @@ -0,0 +1,61 @@ +/* + * This program is used to generate definitions needed by + * assembly language modules. + * + * We use the technique used in the OSF Mach kernel code: + * generate asm statements containing #defines, + * compile this file to assembler, and then extract the + * #defines from the assembly-language output. + */ + +#include <linux/stddef.h> +#include <linux/sched.h> +#include <linux/kernel_stat.h> +#include <linux/ptrace.h> +#include <linux/hardirq.h> +#include <asm/irq.h> +#include <asm/errno.h> + +#define DEFINE(sym, val) \ + asm volatile("\n->" #sym " %0 " #val : : "i" (val)) + +#define BLANK() asm volatile("\n->" : : ) + +int main (void) +{ + /* offsets into the task struct */ + DEFINE (TASK_STATE, offsetof (struct task_struct, state)); + DEFINE (TASK_FLAGS, offsetof (struct task_struct, flags)); + DEFINE (TASK_PTRACE, offsetof (struct task_struct, ptrace)); + DEFINE (TASK_BLOCKED, offsetof (struct task_struct, blocked)); + DEFINE (TASK_THREAD, offsetof (struct task_struct, thread)); + DEFINE (TASK_THREAD_INFO, offsetof (struct task_struct, thread_info)); + DEFINE (TASK_MM, offsetof (struct task_struct, mm)); + DEFINE (TASK_ACTIVE_MM, offsetof (struct task_struct, active_mm)); + DEFINE (TASK_PID, offsetof (struct task_struct, pid)); + + /* offsets into the kernel_stat struct */ + DEFINE (STAT_IRQ, offsetof (struct kernel_stat, irqs)); + + + /* signal defines */ + DEFINE (SIGSEGV, SIGSEGV); + DEFINE (SEGV_MAPERR, SEGV_MAPERR); + DEFINE (SIGTRAP, SIGTRAP); + DEFINE (SIGCHLD, SIGCHLD); + DEFINE (SIGILL, SIGILL); + DEFINE (TRAP_TRACE, TRAP_TRACE); + + /* ptrace flag bits */ + DEFINE (PT_PTRACED, PT_PTRACED); + DEFINE (PT_DTRACE, PT_DTRACE); + + /* error values */ + DEFINE (ENOSYS, ENOSYS); + + /* clone flag bits */ + DEFINE (CLONE_VFORK, CLONE_VFORK); + DEFINE (CLONE_VM, CLONE_VM); + + return 0; +} diff --git a/arch/v850/kernel/bug.c b/arch/v850/kernel/bug.c new file mode 100644 index 00000000000..c78cf750915 --- /dev/null +++ b/arch/v850/kernel/bug.c @@ -0,0 +1,142 @@ +/* + * arch/v850/kernel/bug.c -- Bug reporting functions + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/kernel.h> +#include <linux/reboot.h> +#include <linux/sched.h> +#include <linux/module.h> + +#include <asm/errno.h> +#include <asm/ptrace.h> +#include <asm/processor.h> +#include <asm/current.h> + +/* We should use __builtin_return_address, but it doesn't work in gcc-2.90 + (which is currently our standard compiler on the v850). */ +#define ret_addr() ({ register u32 lp asm ("lp"); lp; }) +#define stack_addr() ({ register u32 sp asm ("sp"); sp; }) + +void __bug () +{ + printk (KERN_CRIT "kernel BUG at PC 0x%x (SP ~0x%x)!\n", + ret_addr() - 4, /* - 4 for `jarl' */ + stack_addr()); + machine_halt (); +} + +int bad_trap (int trap_num, struct pt_regs *regs) +{ + printk (KERN_CRIT + "unimplemented trap %d called at 0x%08lx, pid %d!\n", + trap_num, regs->pc, current->pid); + return -ENOSYS; +} + +#ifdef CONFIG_RESET_GUARD +void unexpected_reset (unsigned long ret_addr, unsigned long kmode, + struct task_struct *task, unsigned long sp) +{ + printk (KERN_CRIT + "unexpected reset in %s mode, pid %d" + " (ret_addr = 0x%lx, sp = 0x%lx)\n", + kmode ? "kernel" : "user", + task ? task->pid : -1, + ret_addr, sp); + + machine_halt (); +} +#endif /* CONFIG_RESET_GUARD */ + + + +struct spec_reg_name { + const char *name; + int gpr; +}; + +struct spec_reg_name spec_reg_names[] = { + { "sp", GPR_SP }, + { "gp", GPR_GP }, + { "tp", GPR_TP }, + { "ep", GPR_EP }, + { "lp", GPR_LP }, + { 0, 0 } +}; + +void show_regs (struct pt_regs *regs) +{ + int gpr_base, gpr_offs; + + printk (" pc 0x%08lx psw 0x%08lx kernel_mode %d\n", + regs->pc, regs->psw, regs->kernel_mode); + printk (" ctpc 0x%08lx ctpsw 0x%08lx ctbp 0x%08lx\n", + regs->ctpc, regs->ctpsw, regs->ctbp); + + for (gpr_base = 0; gpr_base < NUM_GPRS; gpr_base += 4) { + for (gpr_offs = 0; gpr_offs < 4; gpr_offs++) { + int gpr = gpr_base + gpr_offs; + long val = regs->gpr[gpr]; + struct spec_reg_name *srn; + + for (srn = spec_reg_names; srn->name; srn++) + if (srn->gpr == gpr) + break; + + if (srn->name) + printk ("%7s 0x%08lx", srn->name, val); + else + printk (" r%02d 0x%08lx", gpr, val); + } + + printk ("\n"); + } +} + +/* + * TASK is a pointer to the task whose backtrace we want to see (or NULL + * for current task), SP is the stack pointer of the first frame that + * should be shown in the back trace (or NULL if the entire call-chain of + * the task should be shown). + */ +void show_stack (struct task_struct *task, unsigned long *sp) +{ + unsigned long addr, end; + + if (sp) + addr = (unsigned long)sp; + else if (task) + addr = task_sp (task); + else + addr = stack_addr (); + + addr = addr & ~3; + end = (addr + THREAD_SIZE - 1) & THREAD_MASK; + + while (addr < end) { + printk ("%8lX: ", addr); + while (addr < end) { + printk (" %8lX", *(unsigned long *)addr); + addr += sizeof (unsigned long); + if (! (addr & 0xF)) + break; + } + printk ("\n"); + } +} + +void dump_stack () +{ + show_stack (0, 0); +} + +EXPORT_SYMBOL(dump_stack); diff --git a/arch/v850/kernel/entry.S b/arch/v850/kernel/entry.S new file mode 100644 index 00000000000..895e27b1d83 --- /dev/null +++ b/arch/v850/kernel/entry.S @@ -0,0 +1,1121 @@ +/* + * arch/v850/kernel/entry.S -- Low-level system-call handling, trap handlers, + * and context-switching + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/sys.h> + +#include <asm/entry.h> +#include <asm/current.h> +#include <asm/thread_info.h> +#include <asm/clinkage.h> +#include <asm/processor.h> +#include <asm/irq.h> +#include <asm/errno.h> + +#include <asm/asm-consts.h> + + +/* Make a slightly more convenient alias for C_SYMBOL_NAME. */ +#define CSYM C_SYMBOL_NAME + + +/* The offset of the struct pt_regs in a state-save-frame on the stack. */ +#define PTO STATE_SAVE_PT_OFFSET + + +/* Save argument registers to the state-save-frame pointed to by EP. */ +#define SAVE_ARG_REGS \ + sst.w r6, PTO+PT_GPR(6)[ep]; \ + sst.w r7, PTO+PT_GPR(7)[ep]; \ + sst.w r8, PTO+PT_GPR(8)[ep]; \ + sst.w r9, PTO+PT_GPR(9)[ep] +/* Restore argument registers from the state-save-frame pointed to by EP. */ +#define RESTORE_ARG_REGS \ + sld.w PTO+PT_GPR(6)[ep], r6; \ + sld.w PTO+PT_GPR(7)[ep], r7; \ + sld.w PTO+PT_GPR(8)[ep], r8; \ + sld.w PTO+PT_GPR(9)[ep], r9 + +/* Save value return registers to the state-save-frame pointed to by EP. */ +#define SAVE_RVAL_REGS \ + sst.w r10, PTO+PT_GPR(10)[ep]; \ + sst.w r11, PTO+PT_GPR(11)[ep] +/* Restore value return registers from the state-save-frame pointed to by EP. */ +#define RESTORE_RVAL_REGS \ + sld.w PTO+PT_GPR(10)[ep], r10; \ + sld.w PTO+PT_GPR(11)[ep], r11 + + +#define SAVE_CALL_CLOBBERED_REGS_BEFORE_ARGS \ + sst.w r1, PTO+PT_GPR(1)[ep]; \ + sst.w r5, PTO+PT_GPR(5)[ep] +#define SAVE_CALL_CLOBBERED_REGS_AFTER_RVAL \ + sst.w r12, PTO+PT_GPR(12)[ep]; \ + sst.w r13, PTO+PT_GPR(13)[ep]; \ + sst.w r14, PTO+PT_GPR(14)[ep]; \ + sst.w r15, PTO+PT_GPR(15)[ep]; \ + sst.w r16, PTO+PT_GPR(16)[ep]; \ + sst.w r17, PTO+PT_GPR(17)[ep]; \ + sst.w r18, PTO+PT_GPR(18)[ep]; \ + sst.w r19, PTO+PT_GPR(19)[ep] +#define RESTORE_CALL_CLOBBERED_REGS_BEFORE_ARGS \ + sld.w PTO+PT_GPR(1)[ep], r1; \ + sld.w PTO+PT_GPR(5)[ep], r5 +#define RESTORE_CALL_CLOBBERED_REGS_AFTER_RVAL \ + sld.w PTO+PT_GPR(12)[ep], r12; \ + sld.w PTO+PT_GPR(13)[ep], r13; \ + sld.w PTO+PT_GPR(14)[ep], r14; \ + sld.w PTO+PT_GPR(15)[ep], r15; \ + sld.w PTO+PT_GPR(16)[ep], r16; \ + sld.w PTO+PT_GPR(17)[ep], r17; \ + sld.w PTO+PT_GPR(18)[ep], r18; \ + sld.w PTO+PT_GPR(19)[ep], r19 + +/* Save `call clobbered' registers to the state-save-frame pointed to by EP. */ +#define SAVE_CALL_CLOBBERED_REGS \ + SAVE_CALL_CLOBBERED_REGS_BEFORE_ARGS; \ + SAVE_ARG_REGS; \ + SAVE_RVAL_REGS; \ + SAVE_CALL_CLOBBERED_REGS_AFTER_RVAL +/* Restore `call clobbered' registers from the state-save-frame pointed to + by EP. */ +#define RESTORE_CALL_CLOBBERED_REGS \ + RESTORE_CALL_CLOBBERED_REGS_BEFORE_ARGS; \ + RESTORE_ARG_REGS; \ + RESTORE_RVAL_REGS; \ + RESTORE_CALL_CLOBBERED_REGS_AFTER_RVAL + +/* Save `call clobbered' registers except for the return-value registers + to the state-save-frame pointed to by EP. */ +#define SAVE_CALL_CLOBBERED_REGS_NO_RVAL \ + SAVE_CALL_CLOBBERED_REGS_BEFORE_ARGS; \ + SAVE_ARG_REGS; \ + SAVE_CALL_CLOBBERED_REGS_AFTER_RVAL +/* Restore `call clobbered' registers except for the return-value registers + from the state-save-frame pointed to by EP. */ +#define RESTORE_CALL_CLOBBERED_REGS_NO_RVAL \ + RESTORE_CALL_CLOBBERED_REGS_BEFORE_ARGS; \ + RESTORE_ARG_REGS; \ + RESTORE_CALL_CLOBBERED_REGS_AFTER_RVAL + +/* Save `call saved' registers to the state-save-frame pointed to by EP. */ +#define SAVE_CALL_SAVED_REGS \ + sst.w r2, PTO+PT_GPR(2)[ep]; \ + sst.w r20, PTO+PT_GPR(20)[ep]; \ + sst.w r21, PTO+PT_GPR(21)[ep]; \ + sst.w r22, PTO+PT_GPR(22)[ep]; \ + sst.w r23, PTO+PT_GPR(23)[ep]; \ + sst.w r24, PTO+PT_GPR(24)[ep]; \ + sst.w r25, PTO+PT_GPR(25)[ep]; \ + sst.w r26, PTO+PT_GPR(26)[ep]; \ + sst.w r27, PTO+PT_GPR(27)[ep]; \ + sst.w r28, PTO+PT_GPR(28)[ep]; \ + sst.w r29, PTO+PT_GPR(29)[ep] +/* Restore `call saved' registers from the state-save-frame pointed to by EP. */ +#define RESTORE_CALL_SAVED_REGS \ + sld.w PTO+PT_GPR(2)[ep], r2; \ + sld.w PTO+PT_GPR(20)[ep], r20; \ + sld.w PTO+PT_GPR(21)[ep], r21; \ + sld.w PTO+PT_GPR(22)[ep], r22; \ + sld.w PTO+PT_GPR(23)[ep], r23; \ + sld.w PTO+PT_GPR(24)[ep], r24; \ + sld.w PTO+PT_GPR(25)[ep], r25; \ + sld.w PTO+PT_GPR(26)[ep], r26; \ + sld.w PTO+PT_GPR(27)[ep], r27; \ + sld.w PTO+PT_GPR(28)[ep], r28; \ + sld.w PTO+PT_GPR(29)[ep], r29 + + +/* Save the PC stored in the special register SAVEREG to the state-save-frame + pointed to by EP. r19 is clobbered. */ +#define SAVE_PC(savereg) \ + stsr SR_ ## savereg, r19; \ + sst.w r19, PTO+PT_PC[ep] +/* Restore the PC from the state-save-frame pointed to by EP, to the special + register SAVEREG. LP is clobbered (it is used as a scratch register + because the POP_STATE macro restores it, and this macro is usually used + inside POP_STATE). */ +#define RESTORE_PC(savereg) \ + sld.w PTO+PT_PC[ep], lp; \ + ldsr lp, SR_ ## savereg +/* Save the PSW register stored in the special register SAVREG to the + state-save-frame pointed to by EP. r19 is clobbered. */ +#define SAVE_PSW(savereg) \ + stsr SR_ ## savereg, r19; \ + sst.w r19, PTO+PT_PSW[ep] +/* Restore the PSW register from the state-save-frame pointed to by EP, to + the special register SAVEREG. LP is clobbered (it is used as a scratch + register because the POP_STATE macro restores it, and this macro is + usually used inside POP_STATE). */ +#define RESTORE_PSW(savereg) \ + sld.w PTO+PT_PSW[ep], lp; \ + ldsr lp, SR_ ## savereg + +/* Save CTPC/CTPSW/CTBP registers to the state-save-frame pointed to by REG. + r19 is clobbered. */ +#define SAVE_CT_REGS \ + stsr SR_CTPC, r19; \ + sst.w r19, PTO+PT_CTPC[ep]; \ + stsr SR_CTPSW, r19; \ + sst.w r19, PTO+PT_CTPSW[ep]; \ + stsr SR_CTBP, r19; \ + sst.w r19, PTO+PT_CTBP[ep] +/* Restore CTPC/CTPSW/CTBP registers from the state-save-frame pointed to by EP. + LP is clobbered (it is used as a scratch register because the POP_STATE + macro restores it, and this macro is usually used inside POP_STATE). */ +#define RESTORE_CT_REGS \ + sld.w PTO+PT_CTPC[ep], lp; \ + ldsr lp, SR_CTPC; \ + sld.w PTO+PT_CTPSW[ep], lp; \ + ldsr lp, SR_CTPSW; \ + sld.w PTO+PT_CTBP[ep], lp; \ + ldsr lp, SR_CTBP + + +/* Push register state, except for the stack pointer, on the stack in the + form of a state-save-frame (plus some extra padding), in preparation for + a system call. This macro makes sure that the EP, GP, and LP + registers are saved, and TYPE identifies the set of extra registers to + be saved as well. Also copies (the new value of) SP to EP. */ +#define PUSH_STATE(type) \ + addi -STATE_SAVE_SIZE, sp, sp; /* Make room on the stack. */ \ + st.w ep, PTO+PT_GPR(GPR_EP)[sp]; \ + mov sp, ep; \ + sst.w gp, PTO+PT_GPR(GPR_GP)[ep]; \ + sst.w lp, PTO+PT_GPR(GPR_LP)[ep]; \ + type ## _STATE_SAVER +/* Pop a register state pushed by PUSH_STATE, except for the stack pointer, + from the the stack. */ +#define POP_STATE(type) \ + mov sp, ep; \ + type ## _STATE_RESTORER; \ + sld.w PTO+PT_GPR(GPR_GP)[ep], gp; \ + sld.w PTO+PT_GPR(GPR_LP)[ep], lp; \ + sld.w PTO+PT_GPR(GPR_EP)[ep], ep; \ + addi STATE_SAVE_SIZE, sp, sp /* Clean up our stack space. */ + + +/* Switch to the kernel stack if necessary, and push register state on the + stack in the form of a state-save-frame. Also load the current task + pointer if switching from user mode. The stack-pointer (r3) should have + already been saved to the memory location SP_SAVE_LOC (the reason for + this is that the interrupt vectors may be beyond a 22-bit signed offset + jump from the actual interrupt handler, and this allows them to save the + stack-pointer and use that register to do an indirect jump). This macro + makes sure that `special' registers, system registers, and the stack + pointer are saved; TYPE identifies the set of extra registers to be + saved as well. SYSCALL_NUM is the register in which the system-call + number this state is for is stored (r0 if this isn't a system call). + Interrupts should already be disabled when calling this. */ +#define SAVE_STATE(type, syscall_num, sp_save_loc) \ + tst1 0, KM; /* See if already in kernel mode. */ \ + bz 1f; \ + ld.w sp_save_loc, sp; /* ... yes, use saved SP. */ \ + br 2f; \ +1: ld.w KSP, sp; /* ... no, switch to kernel stack. */ \ +2: PUSH_STATE(type); \ + ld.b KM, r19; /* Remember old kernel-mode. */ \ + sst.w r19, PTO+PT_KERNEL_MODE[ep]; \ + ld.w sp_save_loc, r19; /* Remember old SP. */ \ + sst.w r19, PTO+PT_GPR(GPR_SP)[ep]; \ + mov 1, r19; /* Now definitely in kernel-mode. */ \ + st.b r19, KM; \ + GET_CURRENT_TASK(CURRENT_TASK); /* Fetch the current task pointer. */ \ + /* Save away the syscall number. */ \ + sst.w syscall_num, PTO+PT_CUR_SYSCALL[ep] + + +/* Save register state not normally saved by PUSH_STATE for TYPE, to the + state-save-frame on the stack; also copies SP to EP. r19 may be trashed. */ +#define SAVE_EXTRA_STATE(type) \ + mov sp, ep; \ + type ## _EXTRA_STATE_SAVER +/* Restore register state not normally restored by POP_STATE for TYPE, + from the state-save-frame on the stack; also copies SP to EP. + r19 may be trashed. */ +#define RESTORE_EXTRA_STATE(type) \ + mov sp, ep; \ + type ## _EXTRA_STATE_RESTORER + +/* Save any call-clobbered registers not normally saved by PUSH_STATE for + TYPE, to the state-save-frame on the stack. + EP may be trashed, but is not guaranteed to contain a copy of SP + (unlike after most SAVE_... macros). r19 may be trashed. */ +#define SAVE_EXTRA_STATE_FOR_SCHEDULE(type) \ + type ## _SCHEDULE_EXTRA_STATE_SAVER +/* Restore any call-clobbered registers not normally restored by + POP_STATE for TYPE, to the state-save-frame on the stack. + EP may be trashed, but is not guaranteed to contain a copy of SP + (unlike after most RESTORE_... macros). r19 may be trashed. */ +#define RESTORE_EXTRA_STATE_FOR_SCHEDULE(type) \ + type ## _SCHEDULE_EXTRA_STATE_RESTORER + + +/* These are extra_state_saver/restorer values for a user trap. Note + that we save the argument registers so that restarted syscalls will + function properly (otherwise it wouldn't be necessary), and we must + _not_ restore the return-value registers (so that traps can return a + value!), but call-clobbered registers are not saved at all, as the + caller of the syscall function should have saved them. */ + +#define TRAP_RET reti +/* Traps don't save call-clobbered registers (but do still save arg regs). + We preserve PSw to keep long-term state, namely interrupt status (for traps + from kernel-mode), and the single-step flag (for user traps). */ +#define TRAP_STATE_SAVER \ + SAVE_ARG_REGS; \ + SAVE_PC(EIPC); \ + SAVE_PSW(EIPSW) +/* When traps return, they just leave call-clobbered registers (except for arg + regs) with whatever value they have from the kernel. Traps don't preserve + the PSW, but we zero EIPSW to ensure it doesn't contain anything dangerous + (in particular, the single-step flag). */ +#define TRAP_STATE_RESTORER \ + RESTORE_ARG_REGS; \ + RESTORE_PC(EIPC); \ + RESTORE_PSW(EIPSW) +/* Save registers not normally saved by traps. We need to save r12, even + though it's nominally call-clobbered, because it's used when restarting + a system call (the signal-handling path uses SAVE_EXTRA_STATE, and + expects r12 to be restored when the trap returns). */ +#define TRAP_EXTRA_STATE_SAVER \ + SAVE_RVAL_REGS; \ + sst.w r12, PTO+PT_GPR(12)[ep]; \ + SAVE_CALL_SAVED_REGS; \ + SAVE_CT_REGS +#define TRAP_EXTRA_STATE_RESTORER \ + RESTORE_RVAL_REGS; \ + sld.w PTO+PT_GPR(12)[ep], r12; \ + RESTORE_CALL_SAVED_REGS; \ + RESTORE_CT_REGS +/* Save registers prior to calling scheduler (just before trap returns). + We have to save the return-value registers to preserve the trap's return + value. Note that ..._SCHEDULE_EXTRA_STATE_SAVER, unlike most ..._SAVER + macros, is required to setup EP itself if EP is needed (this is because + in many cases, the macro is empty). */ +#define TRAP_SCHEDULE_EXTRA_STATE_SAVER \ + mov sp, ep; \ + SAVE_RVAL_REGS +/* Note that ..._SCHEDULE_EXTRA_STATE_RESTORER, unlike most ..._RESTORER + macros, is required to setup EP itself if EP is needed (this is because + in many cases, the macro is empty). */ +#define TRAP_SCHEDULE_EXTRA_STATE_RESTORER \ + mov sp, ep; \ + RESTORE_RVAL_REGS + +/* Register saving/restoring for maskable interrupts. */ +#define IRQ_RET reti +#define IRQ_STATE_SAVER \ + SAVE_CALL_CLOBBERED_REGS; \ + SAVE_PC(EIPC); \ + SAVE_PSW(EIPSW) +#define IRQ_STATE_RESTORER \ + RESTORE_CALL_CLOBBERED_REGS; \ + RESTORE_PC(EIPC); \ + RESTORE_PSW(EIPSW) +#define IRQ_EXTRA_STATE_SAVER \ + SAVE_CALL_SAVED_REGS; \ + SAVE_CT_REGS +#define IRQ_EXTRA_STATE_RESTORER \ + RESTORE_CALL_SAVED_REGS; \ + RESTORE_CT_REGS +#define IRQ_SCHEDULE_EXTRA_STATE_SAVER /* nothing */ +#define IRQ_SCHEDULE_EXTRA_STATE_RESTORER /* nothing */ + +/* Register saving/restoring for non-maskable interrupts. */ +#define NMI_RET reti +#define NMI_STATE_SAVER \ + SAVE_CALL_CLOBBERED_REGS; \ + SAVE_PC(FEPC); \ + SAVE_PSW(FEPSW); +#define NMI_STATE_RESTORER \ + RESTORE_CALL_CLOBBERED_REGS; \ + RESTORE_PC(FEPC); \ + RESTORE_PSW(FEPSW); +#define NMI_EXTRA_STATE_SAVER \ + SAVE_CALL_SAVED_REGS; \ + SAVE_CT_REGS +#define NMI_EXTRA_STATE_RESTORER \ + RESTORE_CALL_SAVED_REGS; \ + RESTORE_CT_REGS +#define NMI_SCHEDULE_EXTRA_STATE_SAVER /* nothing */ +#define NMI_SCHEDULE_EXTRA_STATE_RESTORER /* nothing */ + +/* Register saving/restoring for debug traps. */ +#define DBTRAP_RET .long 0x014607E0 /* `dbret', but gas doesn't support it. */ +#define DBTRAP_STATE_SAVER \ + SAVE_CALL_CLOBBERED_REGS; \ + SAVE_PC(DBPC); \ + SAVE_PSW(DBPSW) +#define DBTRAP_STATE_RESTORER \ + RESTORE_CALL_CLOBBERED_REGS; \ + RESTORE_PC(DBPC); \ + RESTORE_PSW(DBPSW) +#define DBTRAP_EXTRA_STATE_SAVER \ + SAVE_CALL_SAVED_REGS; \ + SAVE_CT_REGS +#define DBTRAP_EXTRA_STATE_RESTORER \ + RESTORE_CALL_SAVED_REGS; \ + RESTORE_CT_REGS +#define DBTRAP_SCHEDULE_EXTRA_STATE_SAVER /* nothing */ +#define DBTRAP_SCHEDULE_EXTRA_STATE_RESTORER /* nothing */ + +/* Register saving/restoring for a context switch. We don't need to save + too many registers, because context-switching looks like a function call + (via the function `switch_thread'), so callers will save any + call-clobbered registers themselves. We do need to save the CT regs, as + they're normally not saved during kernel entry (the kernel doesn't use + them). We save PSW so that interrupt-status state will correctly follow + each thread (mostly NMI vs. normal-IRQ/trap), though for the most part + it doesn't matter since threads are always in almost exactly the same + processor state during a context switch. The stack pointer and return + value are handled by switch_thread itself. */ +#define SWITCH_STATE_SAVER \ + SAVE_CALL_SAVED_REGS; \ + SAVE_PSW(PSW); \ + SAVE_CT_REGS +#define SWITCH_STATE_RESTORER \ + RESTORE_CALL_SAVED_REGS; \ + RESTORE_PSW(PSW); \ + RESTORE_CT_REGS + + +/* Restore register state from the state-save-frame on the stack, switch back + to the user stack if necessary, and return from the trap/interrupt. + EXTRA_STATE_RESTORER is a sequence of assembly language statements to + restore anything not restored by this macro. Only registers not saved by + the C compiler are restored (that is, R3(sp), R4(gp), R31(lp), and + anything restored by EXTRA_STATE_RESTORER). */ +#define RETURN(type) \ + ld.b PTO+PT_KERNEL_MODE[sp], r19; \ + di; /* Disable interrupts */ \ + cmp r19, r0; /* See if returning to kernel mode, */\ + bne 2f; /* ... if so, skip resched &c. */ \ + \ + /* We're returning to user mode, so check for various conditions that \ + trigger rescheduling. */ \ + GET_CURRENT_THREAD(r18); \ + ld.w TI_FLAGS[r18], r19; \ + andi _TIF_NEED_RESCHED, r19, r0; \ + bnz 3f; /* Call the scheduler. */ \ +5: andi _TIF_SIGPENDING, r19, r18; \ + ld.w TASK_PTRACE[CURRENT_TASK], r19; /* ptrace flags */ \ + or r18, r19; /* see if either is non-zero */ \ + bnz 4f; /* if so, handle them */ \ + \ +/* Return to user state. */ \ +1: st.b r0, KM; /* Now officially in user state. */ \ + \ +/* Final return. The stack-pointer fiddling is not needed when returning \ + to kernel-mode, but they don't hurt, and this way we can share the \ + (sometimes rather lengthy) POP_STATE macro. */ \ +2: POP_STATE(type); \ + st.w sp, KSP; /* Save the kernel stack pointer. */ \ + ld.w PT_GPR(GPR_SP)-PT_SIZE[sp], sp; /* Restore stack pointer. */ \ + type ## _RET; /* Return from the trap/interrupt. */ \ + \ +/* Call the scheduler before returning from a syscall/trap. */ \ +3: SAVE_EXTRA_STATE_FOR_SCHEDULE(type); /* Prepare to call scheduler. */ \ + jarl call_scheduler, lp; /* Call scheduler */ \ + di; /* The scheduler enables interrupts */\ + RESTORE_EXTRA_STATE_FOR_SCHEDULE(type); \ + GET_CURRENT_THREAD(r18); \ + ld.w TI_FLAGS[r18], r19; \ + br 5b; /* Continue with return path. */ \ + \ +/* Handle a signal or ptraced process return. \ + r18 should be non-zero if there are pending signals. */ \ +4: /* Not all registers are saved by the normal trap/interrupt entry \ + points (for instance, call-saved registers (because the normal \ + C-compiler calling sequence in the kernel makes sure they're \ + preserved), and call-clobbered registers in the case of \ + traps), but signal handlers may want to examine or change the \ + complete register state. Here we save anything not saved by \ + the normal entry sequence, so that it may be safely restored \ + (in a possibly modified form) after do_signal returns. */ \ + SAVE_EXTRA_STATE(type); /* Save state not saved by entry. */ \ + jarl handle_signal_or_ptrace_return, lp; \ + RESTORE_EXTRA_STATE(type); /* Restore extra regs. */ \ + br 1b + + +/* Jump to the appropriate function for the system call number in r12 + (r12 is not preserved), or return an error if r12 is not valid. The + LP register should point to the location where the called function + should return. [note that MAKE_SYS_CALL uses label 1] */ +#define MAKE_SYS_CALL \ + /* Figure out which function to use for this system call. */ \ + shl 2, r12; \ + /* See if the system call number is valid. */ \ + addi lo(CSYM(sys_call_table) - sys_call_table_end), r12, r0; \ + bnh 1f; \ + mov hilo(CSYM(sys_call_table)), r19; \ + add r19, r12; \ + ld.w 0[r12], r12; \ + /* Make the system call. */ \ + jmp [r12]; \ + /* The syscall number is invalid, return an error. */ \ +1: addi -ENOSYS, r0, r10; \ + jmp [lp] + + + .text + +/* + * User trap. + * + * Trap 0 system calls are also handled here. + * + * The stack-pointer (r3) should have already been saved to the memory + * location ENTRY_SP (the reason for this is that the interrupt vectors may be + * beyond a 22-bit signed offset jump from the actual interrupt handler, and + * this allows them to save the stack-pointer and use that register to do an + * indirect jump). + * + * Syscall protocol: + * Syscall number in r12, args in r6-r9 + * Return value in r10 + */ +G_ENTRY(trap): + SAVE_STATE (TRAP, r12, ENTRY_SP) // Save registers. + stsr SR_ECR, r19 // Find out which trap it was. + ei // Enable interrupts. + mov hilo(ret_from_trap), lp // where the trap should return + + // The following two shifts (1) clear out extraneous NMI data in the + // upper 16-bits, (2) convert the 0x40 - 0x5f range of trap ECR + // numbers into the (0-31) << 2 range we want, (3) set the flags. + shl 27, r19 // chop off all high bits + shr 25, r19 // scale back down and then << 2 + bnz 2f // See if not trap 0. + + // Trap 0 is a `short' system call, skip general trap table. + MAKE_SYS_CALL // Jump to the syscall function. + +2: // For other traps, use a table lookup. + mov hilo(CSYM(trap_table)), r18 + add r19, r18 + ld.w 0[r18], r18 + jmp [r18] // Jump to the trap handler. +END(trap) + +/* This is just like ret_from_trap, but first restores extra registers + saved by some wrappers. */ +L_ENTRY(restore_extra_regs_and_ret_from_trap): + RESTORE_EXTRA_STATE(TRAP) + // fall through +END(restore_extra_regs_and_ret_from_trap) + +/* Entry point used to return from a syscall/trap. */ +L_ENTRY(ret_from_trap): + RETURN(TRAP) +END(ret_from_trap) + + +/* This the initial entry point for a new child thread, with an appropriate + stack in place that makes it look the the child is in the middle of an + syscall. This function is actually `returned to' from switch_thread + (copy_thread makes ret_from_fork the return address in each new thread's + saved context). */ +C_ENTRY(ret_from_fork): + mov r10, r6 // switch_thread returns the prev task. + jarl CSYM(schedule_tail), lp // ...which is schedule_tail's arg + mov r0, r10 // Child's fork call should return 0. + br ret_from_trap // Do normal trap return. +C_END(ret_from_fork) + + +/* + * Trap 1: `long' system calls + * `Long' syscall protocol: + * Syscall number in r12, args in r6-r9, r13-r14 + * Return value in r10 + */ +L_ENTRY(syscall_long): + // Push extra arguments on the stack. Note that by default, the trap + // handler reserves enough stack space for 6 arguments, so we don't + // have to make any additional room. + st.w r13, 16[sp] // arg 5 + st.w r14, 20[sp] // arg 6 + + // Make sure r13 and r14 are preserved, in case we have to restart a + // system call because of a signal (ep has already been set by caller). + st.w r13, PTO+PT_GPR(13)[sp] + st.w r14, PTO+PT_GPR(13)[sp] + mov hilo(ret_from_long_syscall), lp + + MAKE_SYS_CALL // Jump to the syscall function. +END(syscall_long) + +/* Entry point used to return from a long syscall. Only needed to restore + r13/r14 if the general trap mechanism doesnt' do so. */ +L_ENTRY(ret_from_long_syscall): + ld.w PTO+PT_GPR(13)[sp], r13 // Restore the extra registers + ld.w PTO+PT_GPR(13)[sp], r14 + br ret_from_trap // The rest is the same as other traps +END(ret_from_long_syscall) + + +/* These syscalls need access to the struct pt_regs on the stack, so we + implement them in assembly (they're basically all wrappers anyway). */ + +L_ENTRY(sys_fork_wrapper): +#ifdef CONFIG_MMU + addi SIGCHLD, r0, r6 // Arg 0: flags + ld.w PTO+PT_GPR(GPR_SP)[sp], r7 // Arg 1: child SP (use parent's) + movea PTO, sp, r8 // Arg 2: parent context + mov r0, r9 // Arg 3/4/5: 0 + st.w r0, 16[sp] + st.w r0, 20[sp] + mov hilo(CSYM(do_fork)), r18 // Where the real work gets done + br save_extra_state_tramp // Save state and go there +#else + // fork almost works, enough to trick you into looking elsewhere :-( + addi -EINVAL, r0, r10 + jmp [lp] +#endif +END(sys_fork_wrapper) + +L_ENTRY(sys_vfork_wrapper): + addi CLONE_VFORK | CLONE_VM | SIGCHLD, r0, r6 // Arg 0: flags + ld.w PTO+PT_GPR(GPR_SP)[sp], r7 // Arg 1: child SP (use parent's) + movea PTO, sp, r8 // Arg 2: parent context + mov r0, r9 // Arg 3/4/5: 0 + st.w r0, 16[sp] + st.w r0, 20[sp] + mov hilo(CSYM(do_fork)), r18 // Where the real work gets done + br save_extra_state_tramp // Save state and go there +END(sys_vfork_wrapper) + +L_ENTRY(sys_clone_wrapper): + ld.w PTO+PT_GPR(GPR_SP)[sp], r19// parent's stack pointer + cmp r7, r0 // See if child SP arg (arg 1) is 0. + cmov z, r19, r7, r7 // ... and use the parent's if so. + movea PTO, sp, r8 // Arg 2: parent context + mov r0, r9 // Arg 3/4/5: 0 + st.w r0, 16[sp] + st.w r0, 20[sp] + mov hilo(CSYM(do_fork)), r18 // Where the real work gets done + br save_extra_state_tramp // Save state and go there +END(sys_clone_wrapper) + + +L_ENTRY(sys_execve_wrapper): + movea PTO, sp, r9 // add user context as 4th arg + jr CSYM(sys_execve) // Do real work (tail-call). +END(sys_execve_wrapper) + + +L_ENTRY(sys_sigsuspend_wrapper): + movea PTO, sp, r7 // add user context as 2nd arg + mov hilo(CSYM(sys_sigsuspend)), r18 // syscall function + jarl save_extra_state_tramp, lp // Save state and do it + br restore_extra_regs_and_ret_from_trap +END(sys_sigsuspend_wrapper) +L_ENTRY(sys_rt_sigsuspend_wrapper): + movea PTO, sp, r8 // add user context as 3rd arg + mov hilo(CSYM(sys_rt_sigsuspend)), r18 // syscall function + jarl save_extra_state_tramp, lp // Save state and do it + br restore_extra_regs_and_ret_from_trap +END(sys_rt_sigsuspend_wrapper) + +L_ENTRY(sys_sigreturn_wrapper): + movea PTO, sp, r6 // add user context as 1st arg + mov hilo(CSYM(sys_sigreturn)), r18 // syscall function + jarl save_extra_state_tramp, lp // Save state and do it + br restore_extra_regs_and_ret_from_trap +END(sys_sigreturn_wrapper) +L_ENTRY(sys_rt_sigreturn_wrapper): + movea PTO, sp, r6 // add user context as 1st arg + mov hilo(CSYM(sys_rt_sigreturn)), r18// syscall function + jarl save_extra_state_tramp, lp // Save state and do it + br restore_extra_regs_and_ret_from_trap +END(sys_rt_sigreturn_wrapper) + + +/* Save any state not saved by SAVE_STATE(TRAP), and jump to r18. + It's main purpose is to share the rather lengthy code sequence that + SAVE_STATE expands into among the above wrapper functions. */ +L_ENTRY(save_extra_state_tramp): + SAVE_EXTRA_STATE(TRAP) // Save state not saved by entry. + jmp [r18] // Do the work the caller wants +END(save_extra_state_tramp) + + +/* + * Hardware maskable interrupts. + * + * The stack-pointer (r3) should have already been saved to the memory + * location ENTRY_SP (the reason for this is that the interrupt vectors may be + * beyond a 22-bit signed offset jump from the actual interrupt handler, and + * this allows them to save the stack-pointer and use that register to do an + * indirect jump). + */ +G_ENTRY(irq): + SAVE_STATE (IRQ, r0, ENTRY_SP) // Save registers. + + stsr SR_ECR, r6 // Find out which interrupt it was. + movea PTO, sp, r7 // User regs are arg2 + + // All v850 implementations I know about encode their interrupts as + // multiples of 0x10, starting at 0x80 (after NMIs and software + // interrupts). Convert this number into a simple IRQ index for the + // rest of the kernel. We also clear the upper 16 bits, which hold + // NMI info, and don't appear to be cleared when a NMI returns. + shl 16, r6 // clear upper 16 bits + shr 20, r6 // shift back, and remove lower nibble + add -8, r6 // remove bias for irqs + + // Call the high-level interrupt handling code. + jarl CSYM(handle_irq), lp + + RETURN(IRQ) +END(irq) + + +/* + * Debug trap / illegal-instruction exception + * + * The stack-pointer (r3) should have already been saved to the memory + * location ENTRY_SP (the reason for this is that the interrupt vectors may be + * beyond a 22-bit signed offset jump from the actual interrupt handler, and + * this allows them to save the stack-pointer and use that register to do an + * indirect jump). + */ +G_ENTRY(dbtrap): + SAVE_STATE (DBTRAP, r0, ENTRY_SP)// Save registers. + + /* First see if we came from kernel mode; if so, the dbtrap + instruction has a special meaning, to set the DIR (`debug + information register') register. This is because the DIR register + can _only_ be manipulated/read while in `debug mode,' and debug + mode is only active while we're inside the dbtrap handler. The + exact functionality is: { DIR = (DIR | r6) & ~r7; return DIR; }. */ + ld.b PTO+PT_KERNEL_MODE[sp], r19 + cmp r19, r0 + bz 1f + + stsr SR_DIR, r10 + or r6, r10 + not r7, r7 + and r7, r10 + ldsr r10, SR_DIR + stsr SR_DIR, r10 // Confirm the value we set + st.w r10, PTO+PT_GPR(10)[sp] // return it + br 3f + +1: ei // Enable interrupts. + + /* The default signal type we raise. */ + mov SIGTRAP, r6 + + /* See if it's a single-step trap. */ + stsr SR_DBPSW, r19 + andi 0x0800, r19, r19 + bnz 2f + + /* Look to see if the preceding instruction was is a dbtrap or not, + to decide which signal we should use. */ + stsr SR_DBPC, r19 // PC following trapping insn + ld.hu -2[r19], r19 + ori 0xf840, r0, r20 // DBTRAP insn + cmp r19, r20 // Was this trap caused by DBTRAP? + cmov ne, SIGILL, r6, r6 // Choose signal appropriately + + /* Raise the desired signal. */ +2: mov CURRENT_TASK, r7 // Arg 1: task + jarl CSYM(send_sig), lp // tail call + +3: RETURN(DBTRAP) +END(dbtrap) + + +/* + * Hardware non-maskable interrupts. + * + * The stack-pointer (r3) should have already been saved to the memory + * location ENTRY_SP (the reason for this is that the interrupt vectors may be + * beyond a 22-bit signed offset jump from the actual interrupt handler, and + * this allows them to save the stack-pointer and use that register to do an + * indirect jump). + */ +G_ENTRY(nmi): + SAVE_STATE (NMI, r0, NMI_ENTRY_SP); /* Save registers. */ + + stsr SR_ECR, r6; /* Find out which nmi it was. */ + shr 20, r6; /* Extract NMI code in bits 20-24. */ + movea PTO, sp, r7; /* User regs are arg2. */ + + /* Non-maskable interrupts always lie right after maskable interrupts. + Call the generic IRQ handler, with two arguments, the IRQ number, + and a pointer to the user registers, to handle the specifics. + (we subtract one because the first NMI has code 1). */ + addi FIRST_NMI - 1, r6, r6 + jarl CSYM(handle_irq), lp + + RETURN(NMI) +END(nmi) + + +/* + * Trap with no handler + */ +L_ENTRY(bad_trap_wrapper): + mov r19, r6 // Arg 0: trap number + movea PTO, sp, r7 // Arg 1: user regs + jr CSYM(bad_trap) // tail call handler +END(bad_trap_wrapper) + + +/* + * Invoke the scheduler, called from the trap/irq kernel exit path. + * + * This basically just calls `schedule', but also arranges for extra + * registers to be saved for ptrace'd processes, so ptrace can modify them. + */ +L_ENTRY(call_scheduler): + ld.w TASK_PTRACE[CURRENT_TASK], r19 // See if task is ptrace'd + cmp r19, r0 + bnz 1f // ... yes, do special stuff + jr CSYM(schedule) // ... no, just tail-call scheduler + + // Save extra regs for ptrace'd task. We want to save anything + // that would otherwise only be `implicitly' saved by the normal + // compiler calling-convention. +1: mov sp, ep // Setup EP for SAVE_CALL_SAVED_REGS + SAVE_CALL_SAVED_REGS // Save call-saved registers to stack + mov lp, r20 // Save LP in a callee-saved register + + jarl CSYM(schedule), lp // Call scheduler + + mov r20, lp + mov sp, ep // We can't rely on EP after return + RESTORE_CALL_SAVED_REGS // Restore (possibly modified) regs + jmp [lp] // Return to the return path +END(call_scheduler) + + +/* + * This is an out-of-line handler for two special cases during the kernel + * trap/irq exit sequence: + * + * (1) If r18 is non-zero then a signal needs to be handled, which is + * done, and then the caller returned to. + * + * (2) If r18 is non-zero then we're returning to a ptraced process, which + * has several special cases -- single-stepping and trap tracing, both + * of which require using the `dbret' instruction to exit the kernel + * instead of the normal `reti' (this is because the CPU not correctly + * single-step after a reti). In this case, of course, this handler + * never returns to the caller. + * + * In either case, all registers should have been saved to the current + * state-save-frame on the stack, except for callee-saved registers. + * + * [These two different cases are combined merely to avoid bloating the + * macro-inlined code, not because they really make much sense together!] + */ +L_ENTRY(handle_signal_or_ptrace_return): + cmp r18, r0 // See if handling a signal + bz 1f // ... nope, go do ptrace return + + // Handle a signal + mov lp, r20 // Save link-pointer + mov r10, r21 // Save return-values (for trap) + mov r11, r22 + + movea PTO, sp, r6 // Arg 1: struct pt_regs *regs + mov r0, r7 // Arg 2: sigset_t *oldset + jarl CSYM(do_signal), lp // Handle the signal + di // sig handling enables interrupts + + mov r20, lp // Restore link-pointer + mov r21, r10 // Restore return-values (for trap) + mov r22, r11 + ld.w TASK_PTRACE[CURRENT_TASK], r19 // check ptrace flags too + cmp r19, r0 + bnz 1f // ... some set, so look more +2: jmp [lp] // ... none set, so return normally + + // ptrace return +1: ld.w PTO+PT_PSW[sp], r19 // Look at user-processes's flags + andi 0x0800, r19, r19 // See if single-step flag is set + bz 2b // ... nope, return normally + + // Return as if from a dbtrap insn + st.b r0, KM // Now officially in user state. + POP_STATE(DBTRAP) // Restore regs + st.w sp, KSP // Save the kernel stack pointer. + ld.w PT_GPR(GPR_SP)-PT_SIZE[sp], sp // Restore user stack pointer. + DBTRAP_RET // Return from the trap/interrupt. +END(handle_signal_or_ptrace_return) + + +/* + * This is where we switch between two threads. The arguments are: + * r6 -- pointer to the struct thread for the `current' process + * r7 -- pointer to the struct thread for the `new' process. + * when this function returns, it will return to the new thread. + */ +C_ENTRY(switch_thread): + // Return the previous task (r10 is not clobbered by restore below) + mov CURRENT_TASK, r10 + // First, push the current processor state on the stack + PUSH_STATE(SWITCH) + // Now save the location of the kernel stack pointer for this thread; + // since we've pushed all other state on the stack, this is enough to + // restore it all later. + st.w sp, THREAD_KSP[r6] + // Now restore the stack pointer from the new process + ld.w THREAD_KSP[r7], sp + // ... and restore all state from that + POP_STATE(SWITCH) + // Update the current task pointer + GET_CURRENT_TASK(CURRENT_TASK) + // Now return into the new thread + jmp [lp] +C_END(switch_thread) + + + .data + + .align 4 +C_DATA(trap_table): + .long bad_trap_wrapper // trap 0, doesn't use trap table. + .long syscall_long // trap 1, `long' syscall. + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper + .long bad_trap_wrapper +C_END(trap_table) + + + .section .rodata + + .align 4 +C_DATA(sys_call_table): + .long CSYM(sys_restart_syscall) // 0 + .long CSYM(sys_exit) + .long sys_fork_wrapper + .long CSYM(sys_read) + .long CSYM(sys_write) + .long CSYM(sys_open) // 5 + .long CSYM(sys_close) + .long CSYM(sys_waitpid) + .long CSYM(sys_creat) + .long CSYM(sys_link) + .long CSYM(sys_unlink) // 10 + .long sys_execve_wrapper + .long CSYM(sys_chdir) + .long CSYM(sys_time) + .long CSYM(sys_mknod) + .long CSYM(sys_chmod) // 15 + .long CSYM(sys_chown) + .long CSYM(sys_ni_syscall) // was: break + .long CSYM(sys_ni_syscall) // was: oldstat (aka stat) + .long CSYM(sys_lseek) + .long CSYM(sys_getpid) // 20 + .long CSYM(sys_mount) + .long CSYM(sys_oldumount) + .long CSYM(sys_setuid) + .long CSYM(sys_getuid) + .long CSYM(sys_stime) // 25 + .long CSYM(sys_ptrace) + .long CSYM(sys_alarm) + .long CSYM(sys_ni_syscall) // was: oldfstat (aka fstat) + .long CSYM(sys_pause) + .long CSYM(sys_utime) // 30 + .long CSYM(sys_ni_syscall) // was: stty + .long CSYM(sys_ni_syscall) // was: gtty + .long CSYM(sys_access) + .long CSYM(sys_nice) + .long CSYM(sys_ni_syscall) // 35, was: ftime + .long CSYM(sys_sync) + .long CSYM(sys_kill) + .long CSYM(sys_rename) + .long CSYM(sys_mkdir) + .long CSYM(sys_rmdir) // 40 + .long CSYM(sys_dup) + .long CSYM(sys_pipe) + .long CSYM(sys_times) + .long CSYM(sys_ni_syscall) // was: prof + .long CSYM(sys_brk) // 45 + .long CSYM(sys_setgid) + .long CSYM(sys_getgid) + .long CSYM(sys_signal) + .long CSYM(sys_geteuid) + .long CSYM(sys_getegid) // 50 + .long CSYM(sys_acct) + .long CSYM(sys_umount) // recycled never used phys() + .long CSYM(sys_ni_syscall) // was: lock + .long CSYM(sys_ioctl) + .long CSYM(sys_fcntl) // 55 + .long CSYM(sys_ni_syscall) // was: mpx + .long CSYM(sys_setpgid) + .long CSYM(sys_ni_syscall) // was: ulimit + .long CSYM(sys_ni_syscall) + .long CSYM(sys_umask) // 60 + .long CSYM(sys_chroot) + .long CSYM(sys_ustat) + .long CSYM(sys_dup2) + .long CSYM(sys_getppid) + .long CSYM(sys_getpgrp) // 65 + .long CSYM(sys_setsid) + .long CSYM(sys_sigaction) + .long CSYM(sys_sgetmask) + .long CSYM(sys_ssetmask) + .long CSYM(sys_setreuid) // 70 + .long CSYM(sys_setregid) + .long sys_sigsuspend_wrapper + .long CSYM(sys_sigpending) + .long CSYM(sys_sethostname) + .long CSYM(sys_setrlimit) // 75 + .long CSYM(sys_getrlimit) + .long CSYM(sys_getrusage) + .long CSYM(sys_gettimeofday) + .long CSYM(sys_settimeofday) + .long CSYM(sys_getgroups) // 80 + .long CSYM(sys_setgroups) + .long CSYM(sys_select) + .long CSYM(sys_symlink) + .long CSYM(sys_ni_syscall) // was: oldlstat (aka lstat) + .long CSYM(sys_readlink) // 85 + .long CSYM(sys_uselib) + .long CSYM(sys_swapon) + .long CSYM(sys_reboot) + .long CSYM(old_readdir) + .long CSYM(sys_mmap) // 90 + .long CSYM(sys_munmap) + .long CSYM(sys_truncate) + .long CSYM(sys_ftruncate) + .long CSYM(sys_fchmod) + .long CSYM(sys_fchown) // 95 + .long CSYM(sys_getpriority) + .long CSYM(sys_setpriority) + .long CSYM(sys_ni_syscall) // was: profil + .long CSYM(sys_statfs) + .long CSYM(sys_fstatfs) // 100 + .long CSYM(sys_ni_syscall) // i386: ioperm + .long CSYM(sys_socketcall) + .long CSYM(sys_syslog) + .long CSYM(sys_setitimer) + .long CSYM(sys_getitimer) // 105 + .long CSYM(sys_newstat) + .long CSYM(sys_newlstat) + .long CSYM(sys_newfstat) + .long CSYM(sys_ni_syscall) // was: olduname (aka uname) + .long CSYM(sys_ni_syscall) // 110, i386: iopl + .long CSYM(sys_vhangup) + .long CSYM(sys_ni_syscall) // was: idle + .long CSYM(sys_ni_syscall) // i386: vm86old + .long CSYM(sys_wait4) + .long CSYM(sys_swapoff) // 115 + .long CSYM(sys_sysinfo) + .long CSYM(sys_ipc) + .long CSYM(sys_fsync) + .long sys_sigreturn_wrapper + .long sys_clone_wrapper // 120 + .long CSYM(sys_setdomainname) + .long CSYM(sys_newuname) + .long CSYM(sys_ni_syscall) // i386: modify_ldt, m68k: cacheflush + .long CSYM(sys_adjtimex) + .long CSYM(sys_ni_syscall) // 125 - sys_mprotect + .long CSYM(sys_sigprocmask) + .long CSYM(sys_ni_syscall) // sys_create_module + .long CSYM(sys_init_module) + .long CSYM(sys_delete_module) + .long CSYM(sys_ni_syscall) // 130 - sys_get_kernel_syms + .long CSYM(sys_quotactl) + .long CSYM(sys_getpgid) + .long CSYM(sys_fchdir) + .long CSYM(sys_bdflush) + .long CSYM(sys_sysfs) // 135 + .long CSYM(sys_personality) + .long CSYM(sys_ni_syscall) // for afs_syscall + .long CSYM(sys_setfsuid) + .long CSYM(sys_setfsgid) + .long CSYM(sys_llseek) // 140 + .long CSYM(sys_getdents) + .long CSYM(sys_select) // for backward compat; remove someday + .long CSYM(sys_flock) + .long CSYM(sys_ni_syscall) // sys_msync + .long CSYM(sys_readv) // 145 + .long CSYM(sys_writev) + .long CSYM(sys_getsid) + .long CSYM(sys_fdatasync) + .long CSYM(sys_sysctl) + .long CSYM(sys_ni_syscall) // 150 - sys_mlock + .long CSYM(sys_ni_syscall) // sys_munlock + .long CSYM(sys_ni_syscall) // sys_mlockall + .long CSYM(sys_ni_syscall) // sys_munlockall + .long CSYM(sys_sched_setparam) + .long CSYM(sys_sched_getparam) // 155 + .long CSYM(sys_sched_setscheduler) + .long CSYM(sys_sched_getscheduler) + .long CSYM(sys_sched_yield) + .long CSYM(sys_sched_get_priority_max) + .long CSYM(sys_sched_get_priority_min) // 160 + .long CSYM(sys_sched_rr_get_interval) + .long CSYM(sys_nanosleep) + .long CSYM(sys_ni_syscall) // sys_mremap + .long CSYM(sys_setresuid) + .long CSYM(sys_getresuid) // 165 + .long CSYM(sys_ni_syscall) // for vm86 + .long CSYM(sys_ni_syscall) // sys_query_module + .long CSYM(sys_poll) + .long CSYM(sys_nfsservctl) + .long CSYM(sys_setresgid) // 170 + .long CSYM(sys_getresgid) + .long CSYM(sys_prctl) + .long sys_rt_sigreturn_wrapper + .long CSYM(sys_rt_sigaction) + .long CSYM(sys_rt_sigprocmask) // 175 + .long CSYM(sys_rt_sigpending) + .long CSYM(sys_rt_sigtimedwait) + .long CSYM(sys_rt_sigqueueinfo) + .long sys_rt_sigsuspend_wrapper + .long CSYM(sys_pread64) // 180 + .long CSYM(sys_pwrite64) + .long CSYM(sys_lchown) + .long CSYM(sys_getcwd) + .long CSYM(sys_capget) + .long CSYM(sys_capset) // 185 + .long CSYM(sys_sigaltstack) + .long CSYM(sys_sendfile) + .long CSYM(sys_ni_syscall) // streams1 + .long CSYM(sys_ni_syscall) // streams2 + .long sys_vfork_wrapper // 190 + .long CSYM(sys_ni_syscall) + .long CSYM(sys_mmap2) + .long CSYM(sys_truncate64) + .long CSYM(sys_ftruncate64) + .long CSYM(sys_stat64) // 195 + .long CSYM(sys_lstat64) + .long CSYM(sys_fstat64) + .long CSYM(sys_fcntl64) + .long CSYM(sys_getdents64) + .long CSYM(sys_pivot_root) // 200 + .long CSYM(sys_gettid) + .long CSYM(sys_tkill) +sys_call_table_end: +C_END(sys_call_table) diff --git a/arch/v850/kernel/fpga85e2c.c b/arch/v850/kernel/fpga85e2c.c new file mode 100644 index 00000000000..4bac5149b3c --- /dev/null +++ b/arch/v850/kernel/fpga85e2c.c @@ -0,0 +1,171 @@ +/* + * arch/v850/kernel/fpga85e2c.h -- Machine-dependent defs for + * FPGA implementation of V850E2/NA85E2C + * + * Copyright (C) 2002,03 NEC Electronics Corporation + * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/bootmem.h> +#include <linux/irq.h> +#include <linux/bitops.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/machdep.h> + +#include "mach.h" + +extern void memcons_setup (void); + + +#define REG_DUMP_ADDR 0x220000 + + +extern struct irqaction reg_snap_action; /* fwd decl */ + + +void __init mach_early_init (void) +{ + int i; + const u32 *src; + register u32 *dst asm ("ep"); + extern u32 _intv_end, _intv_load_start; + + /* Set bus sizes: CS0 32-bit, CS1 16-bit, CS7 8-bit, + everything else 32-bit. */ + V850E2_BSC = 0x2AA6; + for (i = 2; i <= 6; i++) + CSDEV(i) = 0; /* 32 bit */ + + /* Ensure that the simulator halts on a panic, instead of going + into an infinite loop inside the panic function. */ + panic_timeout = -1; + + /* Move the interrupt vectors into their real location. Note that + any relocations there are relative to the real location, so we + don't have to fix anything up. We use a loop instead of calling + memcpy to keep this a leaf function (to avoid a function + prologue being generated). */ + dst = 0x10; /* &_intv_start + 0x10. */ + src = &_intv_load_start; + do { + u32 t0 = src[0], t1 = src[1], t2 = src[2], t3 = src[3]; + u32 t4 = src[4], t5 = src[5], t6 = src[6], t7 = src[7]; + dst[0] = t0; dst[1] = t1; dst[2] = t2; dst[3] = t3; + dst[4] = t4; dst[5] = t5; dst[6] = t6; dst[7] = t7; + dst += 8; + src += 8; + } while (dst < &_intv_end); +} + +void __init mach_setup (char **cmdline) +{ + memcons_setup (); + + /* Setup up NMI0 to copy the registers to a known memory location. + The FGPA board has a button that produces NMI0 when pressed, so + this allows us to push the button, and then look at memory to see + what's in the registers (there's no other way to easily do so). + We have to use `setup_irq' instead of `request_irq' because it's + still too early to do memory allocation. */ + setup_irq (IRQ_NMI (0), ®_snap_action); +} + +void mach_get_physical_ram (unsigned long *ram_start, unsigned long *ram_len) +{ + *ram_start = ERAM_ADDR; + *ram_len = ERAM_SIZE; +} + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* Setup up the timer interrupt. The FPGA peripheral control + registers _only_ work with single-bit writes (set1/clr1)! */ + __clear_bit (RPU_GTMC_CE_BIT, &RPU_GTMC); + __clear_bit (RPU_GTMC_CLK_BIT, &RPU_GTMC); + __set_bit (RPU_GTMC_CE_BIT, &RPU_GTMC); + + /* We use the first RPU interrupt, which occurs every 8.192ms. */ + setup_irq (IRQ_RPU (0), timer_action); +} + + +void mach_gettimeofday (struct timespec *tv) +{ + tv->tv_sec = 0; + tv->tv_nsec = 0; +} + +void machine_halt (void) __attribute__ ((noreturn)); +void machine_halt (void) +{ + for (;;) { + DWC(0) = 0x7777; + DWC(1) = 0x7777; + ASC = 0xffff; + FLGREG(0) = 1; /* Halt immediately. */ + asm ("di; halt; nop; nop; nop; nop; nop"); + } +} + +EXPORT_SYMBOL(machine_halt); + +void machine_restart (char *__unused) +{ + machine_halt (); +} + +EXPORT_SYMBOL(machine_restart); + +void machine_power_off (void) +{ + machine_halt (); +} + +EXPORT_SYMBOL(machine_power_off); + + +/* Interrupts */ + +struct v850e_intc_irq_init irq_inits[] = { + { "IRQ", 0, NUM_MACH_IRQS, 1, 7 }, + { "RPU", IRQ_RPU(0), IRQ_RPU_NUM, 1, 6 }, + { 0 } +}; +#define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1) + +struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS]; + +/* Initialize interrupts. */ +void __init mach_init_irqs (void) +{ + v850e_intc_init_irq_types (irq_inits, hw_itypes); +} + + +/* An interrupt handler that copies the registers to a known memory location, + for debugging purposes. */ + +static void make_reg_snap (int irq, void *dummy, struct pt_regs *regs) +{ + (*(unsigned *)REG_DUMP_ADDR)++; + (*(struct pt_regs *)(REG_DUMP_ADDR + sizeof (unsigned))) = *regs; +} + +static int reg_snap_dev_id; +static struct irqaction reg_snap_action = { + make_reg_snap, 0, CPU_MASK_NONE, "reg_snap", ®_snap_dev_id, 0 +}; diff --git a/arch/v850/kernel/fpga85e2c.ld b/arch/v850/kernel/fpga85e2c.ld new file mode 100644 index 00000000000..b5d4578ae41 --- /dev/null +++ b/arch/v850/kernel/fpga85e2c.ld @@ -0,0 +1,62 @@ +/* Linker script for the FPGA implementation of the V850E2 NA85E2C cpu core + (CONFIG_V850E2_FPGA85E2C). */ + +MEMORY { + /* Reset vector. */ + RESET : ORIGIN = 0, LENGTH = 0x10 + /* Interrupt vectors. */ + INTV : ORIGIN = 0x10, LENGTH = 0x470 + /* The `window' in RAM were we're allowed to load stuff. */ + RAM_LOW : ORIGIN = 0x480, LENGTH = 0x0005FB80 + /* Some more ram above the window were we can put bss &c. */ + RAM_HIGH : ORIGIN = 0x00060000, LENGTH = 0x000A0000 + /* This is the area visible from the outside world (we can use + this only for uninitialized data). */ + VISIBLE : ORIGIN = 0x00200000, LENGTH = 0x00060000 +} + +SECTIONS { + .reset : { + __kram_start = . ; + __intv_start = . ; + *(.intv.reset) /* Reset vector */ + } > RESET + + .ram_low : { + __r0_ram = . ; /* Must be near address 0. */ + . = . + 32 ; + + TEXT_CONTENTS + DATA_CONTENTS + ROOT_FS_CONTENTS + RAMK_INIT_CONTENTS_NO_END + INITRAMFS_CONTENTS + } > RAM_LOW + + /* Where the interrupt vectors are initially loaded. */ + __intv_load_start = . ; + + .intv : { + *(.intv.common) /* Vectors common to all v850e proc. */ + *(.intv.mach) /* Machine-specific int. vectors. */ + __intv_end = . ; + } > INTV AT> RAM_LOW + + .ram_high : { + /* This is here so that when we free init memory the + load-time copy of the interrupt vectors and any empty + space at the end of the `RAM_LOW' area is freed too. */ + . = ALIGN (4096); + __init_end = . ; + + BSS_CONTENTS + __kram_end = . ; + BOOTMAP_CONTENTS + } > RAM_HIGH + + .visible : { + _memcons_output = . ; + . = . + 0x8000 ; + _memcons_output_end = . ; + } > VISIBLE +} diff --git a/arch/v850/kernel/gbus_int.c b/arch/v850/kernel/gbus_int.c new file mode 100644 index 00000000000..92918b8d89e --- /dev/null +++ b/arch/v850/kernel/gbus_int.c @@ -0,0 +1,271 @@ +/* + * arch/v850/kernel/gbus_int.c -- Midas labs GBUS interrupt support + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/types.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/signal.h> + +#include <asm/machdep.h> + + +/* The number of shared GINT interrupts. */ +#define NUM_GINTS 4 + +/* For each GINT interrupt, how many GBUS interrupts are using it. */ +static unsigned gint_num_active_irqs[NUM_GINTS] = { 0 }; + +/* A table of GINTn interrupts we actually use. + Note that we don't use GINT0 because all the boards we support treat it + specially. */ +struct used_gint { + unsigned gint; + unsigned priority; +} used_gint[] = { + { 1, GBUS_INT_PRIORITY_HIGH }, + { 3, GBUS_INT_PRIORITY_LOW } +}; +#define NUM_USED_GINTS (sizeof used_gint / sizeof used_gint[0]) + +/* A table of which GINT is used by each GBUS interrupts (they are + assigned based on priority). */ +static unsigned char gbus_int_gint[IRQ_GBUS_INT_NUM]; + + +/* Interrupt enabling/disabling. */ + +/* Enable interrupt handling for interrupt IRQ. */ +void gbus_int_enable_irq (unsigned irq) +{ + unsigned gint = gbus_int_gint[irq - GBUS_INT_BASE_IRQ]; + GBUS_INT_ENABLE (GBUS_INT_IRQ_WORD(irq), gint) + |= GBUS_INT_IRQ_MASK (irq); +} + +/* Disable interrupt handling for interrupt IRQ. Note that any + interrupts received while disabled will be delivered once the + interrupt is enabled again, unless they are explicitly cleared using + `gbus_int_clear_pending_irq'. */ +void gbus_int_disable_irq (unsigned irq) +{ + unsigned gint = gbus_int_gint[irq - GBUS_INT_BASE_IRQ]; + GBUS_INT_ENABLE (GBUS_INT_IRQ_WORD(irq), gint) + &= ~GBUS_INT_IRQ_MASK (irq); +} + +/* Return true if interrupt handling for interrupt IRQ is enabled. */ +int gbus_int_irq_enabled (unsigned irq) +{ + unsigned gint = gbus_int_gint[irq - GBUS_INT_BASE_IRQ]; + return (GBUS_INT_ENABLE (GBUS_INT_IRQ_WORD(irq), gint) + & GBUS_INT_IRQ_MASK(irq)); +} + +/* Disable all GBUS irqs. */ +void gbus_int_disable_irqs () +{ + unsigned w, n; + for (w = 0; w < GBUS_INT_NUM_WORDS; w++) + for (n = 0; n < IRQ_GINT_NUM; n++) + GBUS_INT_ENABLE (w, n) = 0; +} + +/* Clear any pending interrupts for IRQ. */ +void gbus_int_clear_pending_irq (unsigned irq) +{ + GBUS_INT_CLEAR (GBUS_INT_IRQ_WORD(irq)) = GBUS_INT_IRQ_MASK (irq); +} + +/* Return true if interrupt IRQ is pending (but disabled). */ +int gbus_int_irq_pending (unsigned irq) +{ + return (GBUS_INT_STATUS (GBUS_INT_IRQ_WORD(irq)) + & GBUS_INT_IRQ_MASK(irq)); +} + + +/* Delegating interrupts. */ + +/* Handle a shared GINT interrupt by passing to the appropriate GBUS + interrupt handler. */ +static irqreturn_t gbus_int_handle_irq (int irq, void *dev_id, + struct pt_regs *regs) +{ + unsigned w; + irqreturn_t rval = IRQ_NONE; + unsigned gint = irq - IRQ_GINT (0); + + for (w = 0; w < GBUS_INT_NUM_WORDS; w++) { + unsigned status = GBUS_INT_STATUS (w); + unsigned enable = GBUS_INT_ENABLE (w, gint); + + /* Only pay attention to enabled interrupts. */ + status &= enable; + if (status) { + irq = IRQ_GBUS_INT (w * GBUS_INT_BITS_PER_WORD); + do { + /* There's an active interrupt in word + W, find out which one, and call its + handler. */ + + while (! (status & 0x1)) { + irq++; + status >>= 1; + } + status &= ~0x1; + + /* Recursively call handle_irq to handle it. */ + handle_irq (irq, regs); + rval = IRQ_HANDLED; + } while (status); + } + } + + /* Toggle the `all enable' bit back and forth, which should cause + another edge transition if there are any other interrupts + still pending, and so result in another CPU interrupt. */ + GBUS_INT_ENABLE (0, gint) &= ~0x1; + GBUS_INT_ENABLE (0, gint) |= 0x1; + + return rval; +} + + +/* Initialize GBUS interrupt sources. */ + +static void irq_nop (unsigned irq) { } + +static unsigned gbus_int_startup_irq (unsigned irq) +{ + unsigned gint = gbus_int_gint[irq - GBUS_INT_BASE_IRQ]; + + if (gint_num_active_irqs[gint] == 0) { + /* First enable the CPU interrupt. */ + int rval = + request_irq (IRQ_GINT(gint), gbus_int_handle_irq, + SA_INTERRUPT, + "gbus_int_handler", + &gint_num_active_irqs[gint]); + if (rval != 0) + return rval; + } + + gint_num_active_irqs[gint]++; + + gbus_int_clear_pending_irq (irq); + gbus_int_enable_irq (irq); + + return 0; +} + +static void gbus_int_shutdown_irq (unsigned irq) +{ + unsigned gint = gbus_int_gint[irq - GBUS_INT_BASE_IRQ]; + + gbus_int_disable_irq (irq); + + if (--gint_num_active_irqs[gint] == 0) + /* Disable the CPU interrupt. */ + free_irq (IRQ_GINT(gint), &gint_num_active_irqs[gint]); +} + +/* Initialize HW_IRQ_TYPES for INTC-controlled irqs described in array + INITS (which is terminated by an entry with the name field == 0). */ +void __init gbus_int_init_irq_types (struct gbus_int_irq_init *inits, + struct hw_interrupt_type *hw_irq_types) +{ + struct gbus_int_irq_init *init; + for (init = inits; init->name; init++) { + unsigned i; + struct hw_interrupt_type *hwit = hw_irq_types++; + + hwit->typename = init->name; + + hwit->startup = gbus_int_startup_irq; + hwit->shutdown = gbus_int_shutdown_irq; + hwit->enable = gbus_int_enable_irq; + hwit->disable = gbus_int_disable_irq; + hwit->ack = irq_nop; + hwit->end = irq_nop; + + /* Initialize kernel IRQ infrastructure for this interrupt. */ + init_irq_handlers(init->base, init->num, init->interval, hwit); + + /* Set the interrupt priorities. */ + for (i = 0; i < init->num; i++) { + unsigned j; + for (j = 0; j < NUM_USED_GINTS; j++) + if (used_gint[j].priority > init->priority) + break; + /* Wherever we stopped looking is one past the + GINT we want. */ + gbus_int_gint[init->base + i * init->interval + - GBUS_INT_BASE_IRQ] + = used_gint[j > 0 ? j - 1 : 0].gint; + } + } +} + + +/* Initialize IRQS. */ + +/* Chip interrupts (GINTn) shared among GBUS interrupts. */ +static struct hw_interrupt_type gint_hw_itypes[NUM_USED_GINTS]; + + +/* GBUS interrupts themselves. */ + +struct gbus_int_irq_init gbus_irq_inits[] __initdata = { + /* First set defaults. */ + { "GBUS_INT", IRQ_GBUS_INT(0), IRQ_GBUS_INT_NUM, 1, 6}, + { 0 } +}; +#define NUM_GBUS_IRQ_INITS \ + ((sizeof gbus_irq_inits / sizeof gbus_irq_inits[0]) - 1) + +static struct hw_interrupt_type gbus_hw_itypes[NUM_GBUS_IRQ_INITS]; + + +/* Initialize GBUS interrupts. */ +void __init gbus_int_init_irqs (void) +{ + unsigned i; + + /* First initialize the shared gint interrupts. */ + for (i = 0; i < NUM_USED_GINTS; i++) { + unsigned gint = used_gint[i].gint; + struct v850e_intc_irq_init gint_irq_init[2]; + + /* We initialize one GINT interrupt at a time. */ + gint_irq_init[0].name = "GINT"; + gint_irq_init[0].base = IRQ_GINT (gint); + gint_irq_init[0].num = 1; + gint_irq_init[0].interval = 1; + gint_irq_init[0].priority = used_gint[i].priority; + + gint_irq_init[1].name = 0; /* Terminate the vector. */ + + v850e_intc_init_irq_types (gint_irq_init, gint_hw_itypes); + } + + /* Then the GBUS interrupts. */ + gbus_int_disable_irqs (); + gbus_int_init_irq_types (gbus_irq_inits, gbus_hw_itypes); + /* Turn on the `all enable' bits, which are ANDed with + individual interrupt enable bits; we only want to bother with + the latter. They are the first bit in the first word of each + interrupt-enable area. */ + for (i = 0; i < NUM_USED_GINTS; i++) + GBUS_INT_ENABLE (0, used_gint[i].gint) = 0x1; +} diff --git a/arch/v850/kernel/head.S b/arch/v850/kernel/head.S new file mode 100644 index 00000000000..c490b937ef1 --- /dev/null +++ b/arch/v850/kernel/head.S @@ -0,0 +1,128 @@ +/* + * arch/v850/kernel/head.S -- Lowest-level startup code + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <asm/clinkage.h> +#include <asm/current.h> +#include <asm/entry.h> +#include <asm/thread_info.h> +#include <asm/irq.h> + + +/* Make a slightly more convenient alias for C_SYMBOL_NAME. */ +#define CSYM C_SYMBOL_NAME + + + .text + + // Define `mach_early_init' as a weak symbol + .global CSYM(mach_early_init) + .weak CSYM(mach_early_init) + +C_ENTRY(start): + // Make sure interrupts are turned off, just in case + di + +#ifdef CONFIG_RESET_GUARD + // See if we got here via an unexpected reset + ld.w RESET_GUARD, r19 // Check current value of reset guard + mov RESET_GUARD_ACTIVE, r20 + cmp r19, r20 + bne 1f // Guard was not active + + // If we get here, the reset guard was active. Load up some + // interesting values as arguments, and jump to the handler. + st.w r0, RESET_GUARD // Allow further resets to succeed + mov lp, r6 // Arg 0: return address + ld.b KM, r7 // Arg 1: kernel mode + mov sp, r9 // Arg 3: stack pointer + ld.w KSP, r19 // maybe switch to kernel stack + cmp r7, r0 // see if already in kernel mode + cmov z, r19, sp, sp // and switch to kernel stack if not + GET_CURRENT_TASK(r8) // Arg 2: task pointer + jr CSYM(unexpected_reset) + +1: st.w r20, RESET_GUARD // Turn on reset guard +#endif /* CONFIG_RESET_GUARD */ + + // Setup a temporary stack for doing pre-initialization function calls. + // + // We can't use the initial kernel stack, because (1) it may be + // located in memory we're not allowed to touch, and (2) since + // it's in the data segment, calling memcpy to initialize that + // area from ROM will overwrite memcpy's return address. + mov hilo(CSYM(_init_stack_end) - 4), sp + + // See if there's a platform-specific early-initialization routine + // defined; it's a weak symbol, so it will have an address of zero if + // there's not. + mov hilo(CSYM(mach_early_init)), r6 + cmp r6, r0 + bz 3f + + // There is one, so call it. If this function is written in C, it + // should be very careful -- the stack pointer is valid, but very + // little else is (e.g., bss is not zeroed yet, and initialized data + // hasn't been). + jarl 2f, lp // first figure out return address +2: add 3f - ., lp + jmp [r6] // do call +3: + +#ifdef CONFIG_ROM_KERNEL + // Copy the data area from ROM to RAM + mov hilo(CSYM(_rom_copy_dst_start)), r6 + mov hilo(CSYM(_rom_copy_src_start)), r7 + mov hilo(CSYM(_rom_copy_dst_end)), r8 + sub r6, r8 + jarl CSYM(memcpy), lp +#endif + + // Load the initial thread's stack, and current task pointer (in r16) + mov hilo(CSYM(init_thread_union)), r19 + movea THREAD_SIZE, r19, sp + ld.w TI_TASK[r19], CURRENT_TASK + +#ifdef CONFIG_TIME_BOOTUP + /* This stuff must come after mach_early_init, because interrupts may + not work until after its been called. */ + jarl CSYM(highres_timer_reset), lp + jarl CSYM(highres_timer_start), lp +#endif + + // Kernel stack pointer save location + st.w sp, KSP + + // Assert that we're in `kernel mode' + mov 1, r19 + st.w r19, KM + +#ifdef CONFIG_ZERO_BSS + // Zero bss area, since we can't rely upon any loader to do so + mov hilo(CSYM(_sbss)), r6 + mov r0, r7 + mov hilo(CSYM(_ebss)), r8 + sub r6, r8 + jarl CSYM(memset), lp +#endif + + // What happens if the main kernel function returns (it shouldn't) + mov hilo(CSYM(machine_halt)), lp + + // Start the linux kernel. We use an indirect jump to get extra + // range, because on some platforms this initial startup code + // (and the associated platform-specific code in mach_early_init) + // are located far away from the main kernel, e.g. so that they + // can initialize RAM first and copy the kernel or something. + mov hilo(CSYM(start_kernel)), r12 + jmp [r12] +C_END(start) diff --git a/arch/v850/kernel/highres_timer.c b/arch/v850/kernel/highres_timer.c new file mode 100644 index 00000000000..b16ad1eaf96 --- /dev/null +++ b/arch/v850/kernel/highres_timer.c @@ -0,0 +1,132 @@ +/* + * arch/v850/kernel/highres_timer.c -- High resolution timing routines + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <asm/system.h> +#include <asm/v850e_timer_d.h> +#include <asm/highres_timer.h> + +#define HIGHRES_TIMER_USEC_SHIFT 12 + +/* Pre-calculated constant used for converting ticks to real time + units. We initialize it to prevent it being put into BSS. */ +static u32 highres_timer_usec_prescale = 1; + +void highres_timer_slow_tick_irq (void) __attribute__ ((noreturn)); +void highres_timer_slow_tick_irq (void) +{ + /* This is an interrupt handler, so it must be very careful to + not to trash any registers. At this point, the stack-pointer + (r3) has been saved in the chip ram location ENTRY_SP by the + interrupt vector, so we can use it as a scratch register; we + must also restore it before returning. */ + asm ("ld.w %0[r0], sp;" + "add 1, sp;" + "st.w sp, %0[r0];" + "ld.w %1[r0], sp;" /* restore pre-irq stack-pointer */ + "reti" + :: + "i" (HIGHRES_TIMER_SLOW_TICKS_ADDR), + "i" (ENTRY_SP_ADDR) + : "memory"); +} + +void highres_timer_reset (void) +{ + V850E_TIMER_D_TMD (HIGHRES_TIMER_TIMER_D_UNIT) = 0; + HIGHRES_TIMER_SLOW_TICKS = 0; +} + +void highres_timer_start (void) +{ + u32 fast_tick_rate; + + /* Start hardware timer. */ + v850e_timer_d_configure (HIGHRES_TIMER_TIMER_D_UNIT, + HIGHRES_TIMER_SLOW_TICK_RATE); + + fast_tick_rate = + (V850E_TIMER_D_BASE_FREQ + >> V850E_TIMER_D_DIVLOG2 (HIGHRES_TIMER_TIMER_D_UNIT)); + + /* The obvious way of calculating microseconds from fast ticks + is to do: + + usec = fast_ticks * 10^6 / fast_tick_rate + + However, divisions are much slower than multiplications, and + the above calculation can overflow, so we do this instead: + + usec = fast_ticks * (10^6 * 2^12 / fast_tick_rate) / 2^12 + + since we can pre-calculate (10^6 * (2^12 / fast_tick_rate)) + and use a shift for dividing by 2^12, this avoids division, + and is almost as accurate (it differs by about 2 microseconds + at the extreme value of the fast-tick counter's ranger). */ + highres_timer_usec_prescale = ((1000000 << HIGHRES_TIMER_USEC_SHIFT) + / fast_tick_rate); + + /* Enable the interrupt (which is hardwired to this use), and + give it the highest priority. */ + V850E_INTC_IC (IRQ_INTCMD (HIGHRES_TIMER_TIMER_D_UNIT)) = 0; +} + +void highres_timer_stop (void) +{ + /* Stop the timer. */ + V850E_TIMER_D_TMCD (HIGHRES_TIMER_TIMER_D_UNIT) = + V850E_TIMER_D_TMCD_CAE; + /* Disable its interrupt, just in case. */ + v850e_intc_disable_irq (IRQ_INTCMD (HIGHRES_TIMER_TIMER_D_UNIT)); +} + +inline void highres_timer_read_ticks (u32 *slow_ticks, u32 *fast_ticks) +{ + int flags; + u32 fast_ticks_1, fast_ticks_2, _slow_ticks; + + local_irq_save (flags); + fast_ticks_1 = V850E_TIMER_D_TMD (HIGHRES_TIMER_TIMER_D_UNIT); + _slow_ticks = HIGHRES_TIMER_SLOW_TICKS; + fast_ticks_2 = V850E_TIMER_D_TMD (HIGHRES_TIMER_TIMER_D_UNIT); + local_irq_restore (flags); + + if (fast_ticks_2 < fast_ticks_1) + _slow_ticks++; + + *slow_ticks = _slow_ticks; + *fast_ticks = fast_ticks_2; +} + +inline void highres_timer_ticks_to_timeval (u32 slow_ticks, u32 fast_ticks, + struct timeval *tv) +{ + unsigned long sec, sec_rem, usec; + + usec = ((fast_ticks * highres_timer_usec_prescale) + >> HIGHRES_TIMER_USEC_SHIFT); + + sec = slow_ticks / HIGHRES_TIMER_SLOW_TICK_RATE; + sec_rem = slow_ticks % HIGHRES_TIMER_SLOW_TICK_RATE; + + usec += sec_rem * (1000000 / HIGHRES_TIMER_SLOW_TICK_RATE); + + tv->tv_sec = sec; + tv->tv_usec = usec; +} + +void highres_timer_read (struct timeval *tv) +{ + u32 fast_ticks, slow_ticks; + highres_timer_read_ticks (&slow_ticks, &fast_ticks); + highres_timer_ticks_to_timeval (slow_ticks, fast_ticks, tv); +} diff --git a/arch/v850/kernel/init_task.c b/arch/v850/kernel/init_task.c new file mode 100644 index 00000000000..ed2f93cf7c6 --- /dev/null +++ b/arch/v850/kernel/init_task.c @@ -0,0 +1,49 @@ +/* + * arch/v850/kernel/init_task.c -- Initial task/thread structures + * + * Copyright (C) 2002,03 NEC Electronics Corporation + * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/init_task.h> +#include <linux/fs.h> +#include <linux/mqueue.h> + +#include <asm/uaccess.h> +#include <asm/pgtable.h> + +static struct fs_struct init_fs = INIT_FS; +static struct files_struct init_files = INIT_FILES; +static struct signal_struct init_signals = INIT_SIGNALS (init_signals); +static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand); +struct mm_struct init_mm = INIT_MM (init_mm); + +EXPORT_SYMBOL(init_mm); + +/* + * Initial task structure. + * + * All other task structs will be allocated on slabs in fork.c + */ +struct task_struct init_task = INIT_TASK (init_task); + +EXPORT_SYMBOL(init_task); + +/* + * Initial thread structure. + * + * We need to make sure that this is 8192-byte aligned due to the + * way process stacks are handled. This is done by having a special + * "init_task" linker map entry. + */ +union thread_union init_thread_union + __attribute__((__section__(".data.init_task"))) = + { INIT_THREAD_INFO(init_task) }; diff --git a/arch/v850/kernel/intv.S b/arch/v850/kernel/intv.S new file mode 100644 index 00000000000..671e4c6150d --- /dev/null +++ b/arch/v850/kernel/intv.S @@ -0,0 +1,87 @@ +/* + * arch/v850/kernel/intv.S -- Interrupt vectors + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <asm/clinkage.h> +#include <asm/irq.h> +#include <asm/machdep.h> +#include <asm/entry.h> + +#ifdef CONFIG_V850E_HIGHRES_TIMER +#include <asm/highres_timer.h> +#endif + +/* Jump to an interrupt/trap handler. These handlers (defined in entry.S) + expect the stack-pointer to be saved in ENTRY_SP, so we use sp to do an + indirect jump (which avoids problems when the handler is more than a signed + 22-bit offset away). */ +#define JUMP_TO_HANDLER(name, sp_save_loc) \ + st.w sp, sp_save_loc; \ + mov hilo(name), sp; \ + jmp [sp] + + + /* Reset vector. */ + .section .intv.reset, "ax" + .org 0x0 + mov hilo(C_SYMBOL_NAME(start)), r1; + jmp [r1] + + + /* Generic interrupt vectors. */ + .section .intv.common, "ax" + .balign 0x10 + JUMP_TO_HANDLER (nmi, NMI_ENTRY_SP) // 0x10 - NMI0 + .balign 0x10 + JUMP_TO_HANDLER (nmi, NMI_ENTRY_SP) // 0x20 - NMI1 + .balign 0x10 + JUMP_TO_HANDLER (nmi, NMI_ENTRY_SP) // 0x30 - NMI2 + + .balign 0x10 + JUMP_TO_HANDLER (trap, ENTRY_SP) // 0x40 - TRAP0n + .balign 0x10 + JUMP_TO_HANDLER (trap, ENTRY_SP) // 0x50 - TRAP1n + + .balign 0x10 + JUMP_TO_HANDLER (dbtrap, ENTRY_SP) // 0x60 - Illegal op / DBTRAP insn + + + /* Hardware interrupt vectors. */ + .section .intv.mach, "ax" + .org 0x0 + +#if defined (CONFIG_V850E_HIGHRES_TIMER) && defined (IRQ_INTCMD) + + /* Interrupts before the highres timer interrupt. */ + .rept IRQ_INTCMD (HIGHRES_TIMER_TIMER_D_UNIT) + .balign 0x10 + JUMP_TO_HANDLER (irq, ENTRY_SP) + .endr + + /* The highres timer interrupt. */ + .balign 0x10 + JUMP_TO_HANDLER (C_SYMBOL_NAME (highres_timer_slow_tick_irq), ENTRY_SP) + + /* Interrupts after the highres timer interrupt. */ + .rept NUM_CPU_IRQS - IRQ_INTCMD (HIGHRES_TIMER_TIMER_D_UNIT) - 1 + .balign 0x10 + JUMP_TO_HANDLER (irq, ENTRY_SP) + .endr + +#else /* No highres timer */ + + .rept NUM_CPU_IRQS + .balign 0x10 + JUMP_TO_HANDLER (irq, ENTRY_SP) + .endr + +#endif /* Highres timer */ diff --git a/arch/v850/kernel/irq.c b/arch/v850/kernel/irq.c new file mode 100644 index 00000000000..336cbf21dc8 --- /dev/null +++ b/arch/v850/kernel/irq.c @@ -0,0 +1,744 @@ +/* + * arch/v850/kernel/irq.c -- High-level interrupt handling + * + * Copyright (C) 2001,02,03,04 NEC Electronics Corporation + * Copyright (C) 2001,02,03,04 Miles Bader <miles@gnu.org> + * Copyright (C) 1994-2000 Ralf Baechle + * Copyright (C) 1992 Linus Torvalds + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * This file was was derived from the mips version, arch/mips/kernel/irq.c + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/irq.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel_stat.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/random.h> +#include <linux/seq_file.h> + +#include <asm/system.h> + +/* + * Controller mappings for all interrupt sources: + */ +irq_desc_t irq_desc[NR_IRQS] __cacheline_aligned = { + [0 ... NR_IRQS-1] = { + .handler = &no_irq_type, + .lock = SPIN_LOCK_UNLOCKED + } +}; + +/* + * Special irq handlers. + */ + +irqreturn_t no_action(int cpl, void *dev_id, struct pt_regs *regs) +{ + return IRQ_NONE; +} + +/* + * Generic no controller code + */ + +static void enable_none(unsigned int irq) { } +static unsigned int startup_none(unsigned int irq) { return 0; } +static void disable_none(unsigned int irq) { } +static void ack_none(unsigned int irq) +{ + /* + * 'what should we do if we get a hw irq event on an illegal vector'. + * each architecture has to answer this themselves, it doesn't deserve + * a generic callback i think. + */ + printk("received IRQ %d with unknown interrupt type\n", irq); +} + +/* startup is the same as "enable", shutdown is same as "disable" */ +#define shutdown_none disable_none +#define end_none enable_none + +struct hw_interrupt_type no_irq_type = { + "none", + startup_none, + shutdown_none, + enable_none, + disable_none, + ack_none, + end_none +}; + +volatile unsigned long irq_err_count, spurious_count; + +/* + * Generic, controller-independent functions: + */ + +int show_interrupts(struct seq_file *p, void *v) +{ + int i = *(loff_t *) v; + struct irqaction * action; + unsigned long flags; + + if (i == 0) { + seq_puts(p, " "); + for (i=0; i < 1 /*smp_num_cpus*/; i++) + seq_printf(p, "CPU%d ", i); + seq_putc(p, '\n'); + } + + if (i < NR_IRQS) { + int j, count, num; + const char *type_name = irq_desc[i].handler->typename; + spin_lock_irqsave(&irq_desc[j].lock, flags); + action = irq_desc[i].action; + if (!action) + goto skip; + + count = 0; + num = -1; + for (j = 0; j < NR_IRQS; j++) + if (irq_desc[j].handler->typename == type_name) { + if (i == j) + num = count; + count++; + } + + seq_printf(p, "%3d: ",i); + seq_printf(p, "%10u ", kstat_irqs(i)); + if (count > 1) { + int prec = (num >= 100 ? 3 : num >= 10 ? 2 : 1); + seq_printf(p, " %*s%d", 14 - prec, type_name, num); + } else + seq_printf(p, " %14s", type_name); + + seq_printf(p, " %s", action->name); + for (action=action->next; action; action = action->next) + seq_printf(p, ", %s", action->name); + seq_putc(p, '\n'); +skip: + spin_unlock_irqrestore(&irq_desc[j].lock, flags); + } else if (i == NR_IRQS) + seq_printf(p, "ERR: %10lu\n", irq_err_count); + return 0; +} + +/* + * This should really return information about whether + * we should do bottom half handling etc. Right now we + * end up _always_ checking the bottom half, which is a + * waste of time and is not what some drivers would + * prefer. + */ +int handle_IRQ_event(unsigned int irq, struct pt_regs * regs, struct irqaction * action) +{ + int status = 1; /* Force the "do bottom halves" bit */ + int ret; + + if (!(action->flags & SA_INTERRUPT)) + local_irq_enable(); + + do { + ret = action->handler(irq, action->dev_id, regs); + if (ret == IRQ_HANDLED) + status |= action->flags; + action = action->next; + } while (action); + if (status & SA_SAMPLE_RANDOM) + add_interrupt_randomness(irq); + local_irq_disable(); + + return status; +} + +/* + * Generic enable/disable code: this just calls + * down into the PIC-specific version for the actual + * hardware disable after having gotten the irq + * controller lock. + */ + +/** + * disable_irq_nosync - disable an irq without waiting + * @irq: Interrupt to disable + * + * Disable the selected interrupt line. Disables of an interrupt + * stack. Unlike disable_irq(), this function does not ensure existing + * instances of the IRQ handler have completed before returning. + * + * This function may be called from IRQ context. + */ + +void inline disable_irq_nosync(unsigned int irq) +{ + irq_desc_t *desc = irq_desc + irq; + unsigned long flags; + + spin_lock_irqsave(&desc->lock, flags); + if (!desc->depth++) { + desc->status |= IRQ_DISABLED; + desc->handler->disable(irq); + } + spin_unlock_irqrestore(&desc->lock, flags); +} + +/** + * disable_irq - disable an irq and wait for completion + * @irq: Interrupt to disable + * + * Disable the selected interrupt line. Disables of an interrupt + * stack. That is for two disables you need two enables. This + * function waits for any pending IRQ handlers for this interrupt + * to complete before returning. If you use this function while + * holding a resource the IRQ handler may need you will deadlock. + * + * This function may be called - with care - from IRQ context. + */ + +void disable_irq(unsigned int irq) +{ + disable_irq_nosync(irq); + synchronize_irq(irq); +} + +/** + * enable_irq - enable interrupt handling on an irq + * @irq: Interrupt to enable + * + * Re-enables the processing of interrupts on this IRQ line + * providing no disable_irq calls are now in effect. + * + * This function may be called from IRQ context. + */ + +void enable_irq(unsigned int irq) +{ + irq_desc_t *desc = irq_desc + irq; + unsigned long flags; + + spin_lock_irqsave(&desc->lock, flags); + switch (desc->depth) { + case 1: { + unsigned int status = desc->status & ~IRQ_DISABLED; + desc->status = status; + if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) { + desc->status = status | IRQ_REPLAY; + hw_resend_irq(desc->handler,irq); + } + desc->handler->enable(irq); + /* fall-through */ + } + default: + desc->depth--; + break; + case 0: + printk("enable_irq(%u) unbalanced from %p\n", irq, + __builtin_return_address(0)); + } + spin_unlock_irqrestore(&desc->lock, flags); +} + +/* Handle interrupt IRQ. REGS are the registers at the time of ther + interrupt. */ +unsigned int handle_irq (int irq, struct pt_regs *regs) +{ + /* + * We ack quickly, we don't want the irq controller + * thinking we're snobs just because some other CPU has + * disabled global interrupts (we have already done the + * INT_ACK cycles, it's too late to try to pretend to the + * controller that we aren't taking the interrupt). + * + * 0 return value means that this irq is already being + * handled by some other CPU. (or is disabled) + */ + int cpu = smp_processor_id(); + irq_desc_t *desc = irq_desc + irq; + struct irqaction * action; + unsigned int status; + + irq_enter(); + kstat_cpu(cpu).irqs[irq]++; + spin_lock(&desc->lock); + desc->handler->ack(irq); + /* + REPLAY is when Linux resends an IRQ that was dropped earlier + WAITING is used by probe to mark irqs that are being tested + */ + status = desc->status & ~(IRQ_REPLAY | IRQ_WAITING); + status |= IRQ_PENDING; /* we _want_ to handle it */ + + /* + * If the IRQ is disabled for whatever reason, we cannot + * use the action we have. + */ + action = NULL; + if (likely(!(status & (IRQ_DISABLED | IRQ_INPROGRESS)))) { + action = desc->action; + status &= ~IRQ_PENDING; /* we commit to handling */ + status |= IRQ_INPROGRESS; /* we are handling it */ + } + desc->status = status; + + /* + * If there is no IRQ handler or it was disabled, exit early. + Since we set PENDING, if another processor is handling + a different instance of this same irq, the other processor + will take care of it. + */ + if (unlikely(!action)) + goto out; + + /* + * Edge triggered interrupts need to remember + * pending events. + * This applies to any hw interrupts that allow a second + * instance of the same irq to arrive while we are in handle_irq + * or in the handler. But the code here only handles the _second_ + * instance of the irq, not the third or fourth. So it is mostly + * useful for irq hardware that does not mask cleanly in an + * SMP environment. + */ + for (;;) { + spin_unlock(&desc->lock); + handle_IRQ_event(irq, regs, action); + spin_lock(&desc->lock); + + if (likely(!(desc->status & IRQ_PENDING))) + break; + desc->status &= ~IRQ_PENDING; + } + desc->status &= ~IRQ_INPROGRESS; + +out: + /* + * The ->end() handler has to deal with interrupts which got + * disabled while the handler was running. + */ + desc->handler->end(irq); + spin_unlock(&desc->lock); + + irq_exit(); + + return 1; +} + +/** + * request_irq - allocate an interrupt line + * @irq: Interrupt line to allocate + * @handler: Function to be called when the IRQ occurs + * @irqflags: Interrupt type flags + * @devname: An ascii name for the claiming device + * @dev_id: A cookie passed back to the handler function + * + * This call allocates interrupt resources and enables the + * interrupt line and IRQ handling. From the point this + * call is made your handler function may be invoked. Since + * your handler function must clear any interrupt the board + * raises, you must take care both to initialise your hardware + * and to set up the interrupt handler in the right order. + * + * Dev_id must be globally unique. Normally the address of the + * device data structure is used as the cookie. Since the handler + * receives this value it makes sense to use it. + * + * If your interrupt is shared you must pass a non NULL dev_id + * as this is required when freeing the interrupt. + * + * Flags: + * + * SA_SHIRQ Interrupt is shared + * + * SA_INTERRUPT Disable local interrupts while processing + * + * SA_SAMPLE_RANDOM The interrupt can be used for entropy + * + */ + +int request_irq(unsigned int irq, + irqreturn_t (*handler)(int, void *, struct pt_regs *), + unsigned long irqflags, + const char * devname, + void *dev_id) +{ + int retval; + struct irqaction * action; + +#if 1 + /* + * Sanity-check: shared interrupts should REALLY pass in + * a real dev-ID, otherwise we'll have trouble later trying + * to figure out which interrupt is which (messes up the + * interrupt freeing logic etc). + */ + if (irqflags & SA_SHIRQ) { + if (!dev_id) + printk("Bad boy: %s (at 0x%x) called us without a dev_id!\n", devname, (&irq)[-1]); + } +#endif + + if (irq >= NR_IRQS) + return -EINVAL; + if (!handler) + return -EINVAL; + + action = (struct irqaction *) + kmalloc(sizeof(struct irqaction), GFP_KERNEL); + if (!action) + return -ENOMEM; + + action->handler = handler; + action->flags = irqflags; + cpus_clear(action->mask); + action->name = devname; + action->next = NULL; + action->dev_id = dev_id; + + retval = setup_irq(irq, action); + if (retval) + kfree(action); + return retval; +} + +EXPORT_SYMBOL(request_irq); + +/** + * free_irq - free an interrupt + * @irq: Interrupt line to free + * @dev_id: Device identity to free + * + * Remove an interrupt handler. The handler is removed and if the + * interrupt line is no longer in use by any driver it is disabled. + * On a shared IRQ the caller must ensure the interrupt is disabled + * on the card it drives before calling this function. The function + * does not return until any executing interrupts for this IRQ + * have completed. + * + * This function may be called from interrupt context. + * + * Bugs: Attempting to free an irq in a handler for the same irq hangs + * the machine. + */ + +void free_irq(unsigned int irq, void *dev_id) +{ + irq_desc_t *desc; + struct irqaction **p; + unsigned long flags; + + if (irq >= NR_IRQS) + return; + + desc = irq_desc + irq; + spin_lock_irqsave(&desc->lock,flags); + p = &desc->action; + for (;;) { + struct irqaction * action = *p; + if (action) { + struct irqaction **pp = p; + p = &action->next; + if (action->dev_id != dev_id) + continue; + + /* Found it - now remove it from the list of entries */ + *pp = action->next; + if (!desc->action) { + desc->status |= IRQ_DISABLED; + desc->handler->shutdown(irq); + } + spin_unlock_irqrestore(&desc->lock,flags); + + synchronize_irq(irq); + kfree(action); + return; + } + printk("Trying to free free IRQ%d\n",irq); + spin_unlock_irqrestore(&desc->lock,flags); + return; + } +} + +EXPORT_SYMBOL(free_irq); + +/* + * IRQ autodetection code.. + * + * This depends on the fact that any interrupt that + * comes in on to an unassigned handler will get stuck + * with "IRQ_WAITING" cleared and the interrupt + * disabled. + */ + +static DECLARE_MUTEX(probe_sem); + +/** + * probe_irq_on - begin an interrupt autodetect + * + * Commence probing for an interrupt. The interrupts are scanned + * and a mask of potential interrupt lines is returned. + * + */ + +unsigned long probe_irq_on(void) +{ + unsigned int i; + irq_desc_t *desc; + unsigned long val; + unsigned long delay; + + down(&probe_sem); + /* + * something may have generated an irq long ago and we want to + * flush such a longstanding irq before considering it as spurious. + */ + for (i = NR_IRQS-1; i > 0; i--) { + desc = irq_desc + i; + + spin_lock_irq(&desc->lock); + if (!irq_desc[i].action) + irq_desc[i].handler->startup(i); + spin_unlock_irq(&desc->lock); + } + + /* Wait for longstanding interrupts to trigger. */ + for (delay = jiffies + HZ/50; time_after(delay, jiffies); ) + /* about 20ms delay */ barrier(); + + /* + * enable any unassigned irqs + * (we must startup again here because if a longstanding irq + * happened in the previous stage, it may have masked itself) + */ + for (i = NR_IRQS-1; i > 0; i--) { + desc = irq_desc + i; + + spin_lock_irq(&desc->lock); + if (!desc->action) { + desc->status |= IRQ_AUTODETECT | IRQ_WAITING; + if (desc->handler->startup(i)) + desc->status |= IRQ_PENDING; + } + spin_unlock_irq(&desc->lock); + } + + /* + * Wait for spurious interrupts to trigger + */ + for (delay = jiffies + HZ/10; time_after(delay, jiffies); ) + /* about 100ms delay */ barrier(); + + /* + * Now filter out any obviously spurious interrupts + */ + val = 0; + for (i = 0; i < NR_IRQS; i++) { + irq_desc_t *desc = irq_desc + i; + unsigned int status; + + spin_lock_irq(&desc->lock); + status = desc->status; + + if (status & IRQ_AUTODETECT) { + /* It triggered already - consider it spurious. */ + if (!(status & IRQ_WAITING)) { + desc->status = status & ~IRQ_AUTODETECT; + desc->handler->shutdown(i); + } else + if (i < 32) + val |= 1 << i; + } + spin_unlock_irq(&desc->lock); + } + + return val; +} + +EXPORT_SYMBOL(probe_irq_on); + +/* + * Return a mask of triggered interrupts (this + * can handle only legacy ISA interrupts). + */ + +/** + * probe_irq_mask - scan a bitmap of interrupt lines + * @val: mask of interrupts to consider + * + * Scan the ISA bus interrupt lines and return a bitmap of + * active interrupts. The interrupt probe logic state is then + * returned to its previous value. + * + * Note: we need to scan all the irq's even though we will + * only return ISA irq numbers - just so that we reset them + * all to a known state. + */ +unsigned int probe_irq_mask(unsigned long val) +{ + int i; + unsigned int mask; + + mask = 0; + for (i = 0; i < NR_IRQS; i++) { + irq_desc_t *desc = irq_desc + i; + unsigned int status; + + spin_lock_irq(&desc->lock); + status = desc->status; + + if (status & IRQ_AUTODETECT) { + if (i < 16 && !(status & IRQ_WAITING)) + mask |= 1 << i; + + desc->status = status & ~IRQ_AUTODETECT; + desc->handler->shutdown(i); + } + spin_unlock_irq(&desc->lock); + } + up(&probe_sem); + + return mask & val; +} + +/* + * Return the one interrupt that triggered (this can + * handle any interrupt source). + */ + +/** + * probe_irq_off - end an interrupt autodetect + * @val: mask of potential interrupts (unused) + * + * Scans the unused interrupt lines and returns the line which + * appears to have triggered the interrupt. If no interrupt was + * found then zero is returned. If more than one interrupt is + * found then minus the first candidate is returned to indicate + * their is doubt. + * + * The interrupt probe logic state is returned to its previous + * value. + * + * BUGS: When used in a module (which arguably shouldnt happen) + * nothing prevents two IRQ probe callers from overlapping. The + * results of this are non-optimal. + */ + +int probe_irq_off(unsigned long val) +{ + int i, irq_found, nr_irqs; + + nr_irqs = 0; + irq_found = 0; + for (i = 0; i < NR_IRQS; i++) { + irq_desc_t *desc = irq_desc + i; + unsigned int status; + + spin_lock_irq(&desc->lock); + status = desc->status; + + if (status & IRQ_AUTODETECT) { + if (!(status & IRQ_WAITING)) { + if (!nr_irqs) + irq_found = i; + nr_irqs++; + } + desc->status = status & ~IRQ_AUTODETECT; + desc->handler->shutdown(i); + } + spin_unlock_irq(&desc->lock); + } + up(&probe_sem); + + if (nr_irqs > 1) + irq_found = -irq_found; + return irq_found; +} + +EXPORT_SYMBOL(probe_irq_off); + +/* this was setup_x86_irq but it seems pretty generic */ +int setup_irq(unsigned int irq, struct irqaction * new) +{ + int shared = 0; + unsigned long flags; + struct irqaction *old, **p; + irq_desc_t *desc = irq_desc + irq; + + /* + * Some drivers like serial.c use request_irq() heavily, + * so we have to be careful not to interfere with a + * running system. + */ + if (new->flags & SA_SAMPLE_RANDOM) { + /* + * This function might sleep, we want to call it first, + * outside of the atomic block. + * Yes, this might clear the entropy pool if the wrong + * driver is attempted to be loaded, without actually + * installing a new handler, but is this really a problem, + * only the sysadmin is able to do this. + */ + rand_initialize_irq(irq); + } + + /* + * The following block of code has to be executed atomically + */ + spin_lock_irqsave(&desc->lock,flags); + p = &desc->action; + if ((old = *p) != NULL) { + /* Can't share interrupts unless both agree to */ + if (!(old->flags & new->flags & SA_SHIRQ)) { + spin_unlock_irqrestore(&desc->lock,flags); + return -EBUSY; + } + + /* add new interrupt at end of irq queue */ + do { + p = &old->next; + old = *p; + } while (old); + shared = 1; + } + + *p = new; + + if (!shared) { + desc->depth = 0; + desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS); + desc->handler->startup(irq); + } + spin_unlock_irqrestore(&desc->lock,flags); + + /* register_irq_proc(irq); */ + return 0; +} + +/* Initialize irq handling for IRQs. + BASE_IRQ, BASE_IRQ+INTERVAL, ..., BASE_IRQ+NUM*INTERVAL + to IRQ_TYPE. An IRQ_TYPE of 0 means to use a generic interrupt type. */ +void __init +init_irq_handlers (int base_irq, int num, int interval, + struct hw_interrupt_type *irq_type) +{ + while (num-- > 0) { + irq_desc[base_irq].status = IRQ_DISABLED; + irq_desc[base_irq].action = NULL; + irq_desc[base_irq].depth = 1; + irq_desc[base_irq].handler = irq_type; + base_irq += interval; + } +} + +#if defined(CONFIG_PROC_FS) && defined(CONFIG_SYSCTL) +void init_irq_proc(void) +{ +} +#endif /* CONFIG_PROC_FS && CONFIG_SYSCTL */ diff --git a/arch/v850/kernel/ma.c b/arch/v850/kernel/ma.c new file mode 100644 index 00000000000..b3dfbc5d2f4 --- /dev/null +++ b/arch/v850/kernel/ma.c @@ -0,0 +1,70 @@ +/* + * arch/v850/kernel/ma.c -- V850E/MA series of cpu chips + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/bootmem.h> +#include <linux/irq.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/machdep.h> +#include <asm/v850e_timer_d.h> + +#include "mach.h" + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* Start hardware timer. */ + v850e_timer_d_configure (0, HZ); + /* Install timer interrupt handler. */ + setup_irq (IRQ_INTCMD(0), timer_action); +} + +static struct v850e_intc_irq_init irq_inits[] = { + { "IRQ", 0, NUM_MACH_IRQS, 1, 7 }, + { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 }, + { "DMA", IRQ_INTDMA(0), IRQ_INTDMA_NUM, 1, 2 }, + { "CSI", IRQ_INTCSI(0), IRQ_INTCSI_NUM, 4, 4 }, + { "SER", IRQ_INTSER(0), IRQ_INTSER_NUM, 4, 3 }, + { "SR", IRQ_INTSR(0), IRQ_INTSR_NUM, 4, 4 }, + { "ST", IRQ_INTST(0), IRQ_INTST_NUM, 4, 5 }, + { 0 } +}; +#define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1) + +static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS]; + +/* Initialize MA chip interrupts. */ +void __init ma_init_irqs (void) +{ + v850e_intc_init_irq_types (irq_inits, hw_itypes); +} + +/* Called before configuring an on-chip UART. */ +void ma_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud) +{ + /* We only know about the first two UART channels (though + specific chips may have more). */ + if (chan < 2) { + unsigned bits = 0x3 << (chan * 3); + /* Specify that the relevant pins on the chip should do + serial I/O, not direct I/O. */ + MA_PORT4_PMC |= bits; + /* Specify that we're using the UART, not the CSI device. */ + MA_PORT4_PFC |= bits; + } +} diff --git a/arch/v850/kernel/mach.c b/arch/v850/kernel/mach.c new file mode 100644 index 00000000000..b9db278d2b7 --- /dev/null +++ b/arch/v850/kernel/mach.c @@ -0,0 +1,17 @@ +/* + * arch/v850/kernel/mach.c -- Defaults for some things defined by "mach.h" + * + * Copyright (C) 2001 NEC Corporation + * Copyright (C) 2001 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include "mach.h" + +/* Called with each timer tick, if non-zero. */ +void (*mach_tick)(void) = 0; diff --git a/arch/v850/kernel/mach.h b/arch/v850/kernel/mach.h new file mode 100644 index 00000000000..9e0e4816ec5 --- /dev/null +++ b/arch/v850/kernel/mach.h @@ -0,0 +1,56 @@ +/* + * arch/v850/kernel/mach.h -- Machine-dependent functions used by v850 port + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#ifndef __V850_MACH_H__ +#define __V850_MACH_H__ + +#include <linux/kernel.h> +#include <linux/time.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/fs.h> +#include <linux/seq_file.h> + +#include <asm/ptrace.h> +#include <asm/entry.h> +#include <asm/clinkage.h> + +void mach_setup (char **cmdline); +void mach_gettimeofday (struct timespec *tv); +void mach_sched_init (struct irqaction *timer_action); +void mach_get_physical_ram (unsigned long *ram_start, unsigned long *ram_len); +void mach_init_irqs (void); + +/* If defined, is called very early in the kernel initialization. The + stack pointer is valid, but very little has been initialized (e.g., + bss is not zeroed yet) when this is called, so care must taken. */ +void mach_early_init (void); + +/* If defined, called after the bootmem allocator has been initialized, + to allow the platform-dependent code to reserve any areas of RAM that + the kernel shouldn't touch. */ +void mach_reserve_bootmem (void) __attribute__ ((__weak__)); + +/* Called with each timer tick, if non-zero. */ +extern void (*mach_tick) (void); + +/* The following establishes aliases for various mach_ functions to the + name by which the rest of the kernel calls them. These statements + should only have an effect in the file that defines the actual functions. */ +#define MACH_ALIAS(to, from) \ + asm (".global " macrology_stringify (C_SYMBOL_NAME (to)) ";" \ + macrology_stringify (C_SYMBOL_NAME (to)) \ + " = " macrology_stringify (C_SYMBOL_NAME (from))) +/* e.g.: MACH_ALIAS (kernel_name, arch_spec_name); */ + +#endif /* __V850_MACH_H__ */ diff --git a/arch/v850/kernel/me2.c b/arch/v850/kernel/me2.c new file mode 100644 index 00000000000..6527c218f91 --- /dev/null +++ b/arch/v850/kernel/me2.c @@ -0,0 +1,74 @@ +/* + * arch/v850/kernel/me2.c -- V850E/ME2 chip-specific support + * + * Copyright (C) 2003 NEC Corporation + * Copyright (C) 2003 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/bootmem.h> +#include <linux/irq.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/machdep.h> +#include <asm/v850e_timer_d.h> + +#include "mach.h" + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* Start hardware timer. */ + v850e_timer_d_configure (0, HZ); + /* Install timer interrupt handler. */ + setup_irq (IRQ_INTCMD(0), timer_action); +} + +static struct v850e_intc_irq_init irq_inits[] = { + { "IRQ", 0, NUM_CPU_IRQS, 1, 7 }, + { "INTP", IRQ_INTP(0), IRQ_INTP_NUM, 1, 5 }, + { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 3 }, + { "UBTIRE", IRQ_INTUBTIRE(0), IRQ_INTUBTIRE_NUM, 5, 4 }, + { "UBTIR", IRQ_INTUBTIR(0), IRQ_INTUBTIR_NUM, 5, 4 }, + { "UBTIT", IRQ_INTUBTIT(0), IRQ_INTUBTIT_NUM, 5, 4 }, + { "UBTIF", IRQ_INTUBTIF(0), IRQ_INTUBTIF_NUM, 5, 4 }, + { "UBTITO", IRQ_INTUBTITO(0), IRQ_INTUBTITO_NUM, 5, 4 }, + { 0 } +}; +#define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1) + +static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS]; + +/* Initialize V850E/ME2 chip interrupts. */ +void __init me2_init_irqs (void) +{ + v850e_intc_init_irq_types (irq_inits, hw_itypes); +} + +/* Called before configuring an on-chip UART. */ +void me2_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud) +{ + if (chan == 0) { + /* Specify that the relevent pins on the chip should do + serial I/O, not direct I/O. */ + ME2_PORT1_PMC |= 0xC; + /* Specify that we're using the UART, not the CSI device. */ + ME2_PORT1_PFC |= 0xC; + } else if (chan == 1) { + /* Specify that the relevent pins on the chip should do + serial I/O, not direct I/O. */ + ME2_PORT2_PMC |= 0x6; + /* Specify that we're using the UART, not the CSI device. */ + ME2_PORT2_PFC |= 0x6; + } +} diff --git a/arch/v850/kernel/memcons.c b/arch/v850/kernel/memcons.c new file mode 100644 index 00000000000..491614c435c --- /dev/null +++ b/arch/v850/kernel/memcons.c @@ -0,0 +1,135 @@ +/* + * arch/v850/kernel/memcons.c -- Console I/O to a memory buffer + * + * Copyright (C) 2001,02 NEC Corporation + * Copyright (C) 2001,02 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/kernel.h> +#include <linux/console.h> +#include <linux/tty.h> +#include <linux/tty_driver.h> +#include <linux/init.h> + +/* If this device is enabled, the linker map should define start and + end points for its buffer. */ +extern char memcons_output[], memcons_output_end; + +/* Current offset into the buffer. */ +static unsigned long memcons_offs = 0; + +/* Spinlock protecting memcons_offs. */ +static DEFINE_SPINLOCK(memcons_lock); + + +static size_t write (const char *buf, size_t len) +{ + int flags; + char *point; + + spin_lock_irqsave (memcons_lock, flags); + + point = memcons_output + memcons_offs; + if (point + len >= &memcons_output_end) { + len = &memcons_output_end - point; + memcons_offs = 0; + } else + memcons_offs += len; + + spin_unlock_irqrestore (memcons_lock, flags); + + memcpy (point, buf, len); + + return len; +} + + +/* Low-level console. */ + +static void memcons_write (struct console *co, const char *buf, unsigned len) +{ + while (len > 0) + len -= write (buf, len); +} + +static struct tty_driver *tty_driver; + +static struct tty_driver *memcons_device (struct console *co, int *index) +{ + *index = co->index; + return tty_driver; +} + +static struct console memcons = +{ + .name = "memcons", + .write = memcons_write, + .device = memcons_device, + .flags = CON_PRINTBUFFER, + .index = -1, +}; + +void memcons_setup (void) +{ + register_console (&memcons); + printk (KERN_INFO "Console: static memory buffer (memcons)\n"); +} + +/* Higher level TTY interface. */ + +int memcons_tty_open (struct tty_struct *tty, struct file *filp) +{ + return 0; +} + +int memcons_tty_write (struct tty_struct *tty, const unsigned char *buf, int len) +{ + return write (buf, len); +} + +int memcons_tty_write_room (struct tty_struct *tty) +{ + return &memcons_output_end - (memcons_output + memcons_offs); +} + +int memcons_tty_chars_in_buffer (struct tty_struct *tty) +{ + /* We have no buffer. */ + return 0; +} + +static struct tty_operations ops = { + .open = memcons_tty_open, + .write = memcons_tty_write, + .write_room = memcons_tty_write_room, + .chars_in_buffer = memcons_tty_chars_in_buffer, +}; + +int __init memcons_tty_init (void) +{ + int err; + struct tty_driver *driver = alloc_tty_driver(1); + if (!driver) + return -ENOMEM; + + driver->name = "memcons"; + driver->major = TTY_MAJOR; + driver->minor_start = 64; + driver->type = TTY_DRIVER_TYPE_SYSCONS; + driver->init_termios = tty_std_termios; + tty_set_operations(driver, &ops); + err = tty_register_driver(driver); + if (err) { + put_tty_driver(driver); + return err; + } + tty_driver = driver; + return 0; +} +__initcall (memcons_tty_init); diff --git a/arch/v850/kernel/module.c b/arch/v850/kernel/module.c new file mode 100644 index 00000000000..64aeb3e37c5 --- /dev/null +++ b/arch/v850/kernel/module.c @@ -0,0 +1,237 @@ +/* + * arch/v850/kernel/module.c -- Architecture-specific module functions + * + * Copyright (C) 2002,03 NEC Electronics Corporation + * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> + * Copyright (C) 2001,03 Rusty Russell + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + * + * Derived in part from arch/ppc/kernel/module.c + */ + +#include <linux/kernel.h> +#include <linux/vmalloc.h> +#include <linux/moduleloader.h> +#include <linux/elf.h> + +#if 0 +#define DEBUGP printk +#else +#define DEBUGP(fmt , ...) +#endif + +void *module_alloc (unsigned long size) +{ + return size == 0 ? 0 : vmalloc (size); +} + +void module_free (struct module *mod, void *module_region) +{ + vfree (module_region); + /* FIXME: If module_region == mod->init_region, trim exception + table entries. */ +} + +int module_finalize (const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, + struct module *mod) +{ + return 0; +} + +/* Count how many different relocations (different symbol, different + addend) */ +static unsigned int count_relocs(const Elf32_Rela *rela, unsigned int num) +{ + unsigned int i, j, ret = 0; + + /* Sure, this is order(n^2), but it's usually short, and not + time critical */ + for (i = 0; i < num; i++) { + for (j = 0; j < i; j++) { + /* If this addend appeared before, it's + already been counted */ + if (ELF32_R_SYM(rela[i].r_info) + == ELF32_R_SYM(rela[j].r_info) + && rela[i].r_addend == rela[j].r_addend) + break; + } + if (j == i) ret++; + } + return ret; +} + +/* Get the potential trampolines size required of the init and + non-init sections */ +static unsigned long get_plt_size(const Elf32_Ehdr *hdr, + const Elf32_Shdr *sechdrs, + const char *secstrings, + int is_init) +{ + unsigned long ret = 0; + unsigned i; + + /* Everything marked ALLOC (this includes the exported + symbols) */ + for (i = 1; i < hdr->e_shnum; i++) { + /* If it's called *.init*, and we're not init, we're + not interested */ + if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != 0) + != is_init) + continue; + + if (sechdrs[i].sh_type == SHT_RELA) { + DEBUGP("Found relocations in section %u\n", i); + DEBUGP("Ptr: %p. Number: %u\n", + (void *)hdr + sechdrs[i].sh_offset, + sechdrs[i].sh_size / sizeof(Elf32_Rela)); + ret += count_relocs((void *)hdr + + sechdrs[i].sh_offset, + sechdrs[i].sh_size + / sizeof(Elf32_Rela)) + * sizeof(struct v850_plt_entry); + } + } + + return ret; +} + +int module_frob_arch_sections(Elf32_Ehdr *hdr, + Elf32_Shdr *sechdrs, + char *secstrings, + struct module *me) +{ + unsigned int i; + + /* Find .plt and .pltinit sections */ + for (i = 0; i < hdr->e_shnum; i++) { + if (strcmp(secstrings + sechdrs[i].sh_name, ".init.plt") == 0) + me->arch.init_plt_section = i; + else if (strcmp(secstrings + sechdrs[i].sh_name, ".plt") == 0) + me->arch.core_plt_section = i; + } + if (!me->arch.core_plt_section || !me->arch.init_plt_section) { + printk("Module doesn't contain .plt or .plt.init sections.\n"); + return -ENOEXEC; + } + + /* Override their sizes */ + sechdrs[me->arch.core_plt_section].sh_size + = get_plt_size(hdr, sechdrs, secstrings, 0); + sechdrs[me->arch.init_plt_section].sh_size + = get_plt_size(hdr, sechdrs, secstrings, 1); + return 0; +} + +int apply_relocate (Elf32_Shdr *sechdrs, const char *strtab, + unsigned int symindex, unsigned int relsec, + struct module *mod) +{ + printk ("Barf\n"); + return -ENOEXEC; +} + +/* Set up a trampoline in the PLT to bounce us to the distant function */ +static uint32_t do_plt_call (void *location, Elf32_Addr val, + Elf32_Shdr *sechdrs, struct module *mod) +{ + struct v850_plt_entry *entry; + /* Instructions used to do the indirect jump. */ + uint32_t tramp[2]; + + /* We have to trash a register, so we assume that any control + transfer more than 21-bits away must be a function call + (so we can use a call-clobbered register). */ + tramp[0] = 0x0621 + ((val & 0xffff) << 16); /* mov sym, r1 ... */ + tramp[1] = ((val >> 16) & 0xffff) + 0x610000; /* ...; jmp r1 */ + + /* Init, or core PLT? */ + if (location >= mod->module_core + && location < mod->module_core + mod->core_size) + entry = (void *)sechdrs[mod->arch.core_plt_section].sh_addr; + else + entry = (void *)sechdrs[mod->arch.init_plt_section].sh_addr; + + /* Find this entry, or if that fails, the next avail. entry */ + while (entry->tramp[0]) + if (entry->tramp[0] == tramp[0] && entry->tramp[1] == tramp[1]) + return (uint32_t)entry; + else + entry++; + + entry->tramp[0] = tramp[0]; + entry->tramp[1] = tramp[1]; + + return (uint32_t)entry; +} + +int apply_relocate_add (Elf32_Shdr *sechdrs, const char *strtab, + unsigned int symindex, unsigned int relsec, + struct module *mod) +{ + unsigned int i; + Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; + + DEBUGP ("Applying relocate section %u to %u\n", relsec, + sechdrs[relsec].sh_info); + + for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) { + /* This is where to make the change */ + uint32_t *loc + = ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + + rela[i].r_offset); + /* This is the symbol it is referring to. Note that all + undefined symbols have been resolved. */ + Elf32_Sym *sym + = ((Elf32_Sym *)sechdrs[symindex].sh_addr + + ELF32_R_SYM (rela[i].r_info)); + uint32_t val = sym->st_value + rela[i].r_addend; + + switch (ELF32_R_TYPE (rela[i].r_info)) { + case R_V850_32: + /* We write two shorts instead of a long because even + 32-bit insns only need half-word alignment, but + 32-bit data writes need to be long-word aligned. */ + val += ((uint16_t *)loc)[0]; + val += ((uint16_t *)loc)[1] << 16; + ((uint16_t *)loc)[0] = val & 0xffff; + ((uint16_t *)loc)[1] = (val >> 16) & 0xffff; + break; + + case R_V850_22_PCREL: + /* Maybe jump indirectly via a PLT table entry. */ + if ((int32_t)(val - (uint32_t)loc) > 0x1fffff + || (int32_t)(val - (uint32_t)loc) < -0x200000) + val = do_plt_call (loc, val, sechdrs, mod); + + val -= (uint32_t)loc; + + /* We write two shorts instead of a long because + even 32-bit insns only need half-word alignment, + but 32-bit data writes need to be long-word + aligned. */ + ((uint16_t *)loc)[0] = + (*(uint16_t *)loc & 0xffc0) /* opcode + reg */ + | ((val >> 16) & 0xffc03f); /* offs high */ + ((uint16_t *)loc)[1] = + (val & 0xffff); /* offs low */ + break; + + default: + printk (KERN_ERR "module %s: Unknown reloc: %u\n", + mod->name, ELF32_R_TYPE (rela[i].r_info)); + return -ENOEXEC; + } + } + + return 0; +} + +void +module_arch_cleanup(struct module *mod) +{ +} diff --git a/arch/v850/kernel/process.c b/arch/v850/kernel/process.c new file mode 100644 index 00000000000..9c708c32c1f --- /dev/null +++ b/arch/v850/kernel/process.c @@ -0,0 +1,236 @@ +/* + * arch/v850/kernel/process.c -- Arch-dependent process handling + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/slab.h> +#include <linux/user.h> +#include <linux/a.out.h> +#include <linux/reboot.h> + +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/pgtable.h> + +extern void ret_from_fork (void); + + +/* The idle loop. */ +void default_idle (void) +{ + while (1) { + while (! need_resched ()) + asm ("halt; nop; nop; nop; nop; nop" ::: "cc"); + schedule (); + } +} + +void (*idle)(void) = default_idle; + +/* + * The idle thread. There's no useful work to be + * done, so just try to conserve power and have a + * low exit latency (ie sit in a loop waiting for + * somebody to say that they'd like to reschedule) + */ +void cpu_idle (void) +{ + /* endless idle loop with no priority at all */ + (*idle) (); +} + +/* + * This is the mechanism for creating a new kernel thread. + * + * NOTE! Only a kernel-only process (ie the swapper or direct descendants who + * haven't done an "execve()") should use this: it will work within a system + * call from a "real" process, but the process memory space will not be free'd + * until both the parent and the child have exited. + */ +int kernel_thread (int (*fn)(void *), void *arg, unsigned long flags) +{ + register mm_segment_t fs = get_fs (); + register unsigned long syscall asm (SYSCALL_NUM); + register unsigned long arg0 asm (SYSCALL_ARG0); + register unsigned long ret asm (SYSCALL_RET); + + set_fs (KERNEL_DS); + + /* Clone this thread. Note that we don't pass the clone syscall's + second argument -- it's ignored for calls from kernel mode (the + child's SP is always set to the top of the kernel stack). */ + arg0 = flags | CLONE_VM; + syscall = __NR_clone; + asm volatile ("trap " SYSCALL_SHORT_TRAP + : "=r" (ret), "=r" (syscall) + : "1" (syscall), "r" (arg0) + : SYSCALL_SHORT_CLOBBERS); + + if (ret == 0) { + /* In child thread, call FN and exit. */ + arg0 = (*fn) (arg); + syscall = __NR_exit; + asm volatile ("trap " SYSCALL_SHORT_TRAP + : "=r" (ret), "=r" (syscall) + : "1" (syscall), "r" (arg0) + : SYSCALL_SHORT_CLOBBERS); + } + + /* In parent. */ + set_fs (fs); + + return ret; +} + +void flush_thread (void) +{ + set_fs (USER_DS); +} + +int copy_thread (int nr, unsigned long clone_flags, + unsigned long stack_start, unsigned long stack_size, + struct task_struct *p, struct pt_regs *regs) +{ + /* Start pushing stuff from the top of the child's kernel stack. */ + unsigned long orig_ksp = (unsigned long)p->thread_info + THREAD_SIZE; + unsigned long ksp = orig_ksp; + /* We push two `state save' stack fames (see entry.S) on the new + kernel stack: + 1) The innermost one is what switch_thread would have + pushed, and is used when we context switch to the child + thread for the first time. It's set up to return to + ret_from_fork in entry.S. + 2) The outermost one (nearest the top) is what a syscall + trap would have pushed, and is set up to return to the + same location as the parent thread, but with a return + value of 0. */ + struct pt_regs *child_switch_regs, *child_trap_regs; + + /* Trap frame. */ + ksp -= STATE_SAVE_SIZE; + child_trap_regs = (struct pt_regs *)(ksp + STATE_SAVE_PT_OFFSET); + /* Switch frame. */ + ksp -= STATE_SAVE_SIZE; + child_switch_regs = (struct pt_regs *)(ksp + STATE_SAVE_PT_OFFSET); + + /* First copy parent's register state to child. */ + *child_switch_regs = *regs; + *child_trap_regs = *regs; + + /* switch_thread returns to the restored value of the lp + register (r31), so we make that the place where we want to + jump when the child thread begins running. */ + child_switch_regs->gpr[GPR_LP] = (v850_reg_t)ret_from_fork; + + if (regs->kernel_mode) + /* Since we're returning to kernel-mode, make sure the child's + stored kernel stack pointer agrees with what the actual + stack pointer will be at that point (the trap return code + always restores the SP, even when returning to + kernel-mode). */ + child_trap_regs->gpr[GPR_SP] = orig_ksp; + else + /* Set the child's user-mode stack-pointer (the name + `stack_start' is a misnomer, it's just the initial SP + value). */ + child_trap_regs->gpr[GPR_SP] = stack_start; + + /* Thread state for the child (everything else is on the stack). */ + p->thread.ksp = ksp; + + return 0; +} + +/* + * fill in the user structure for a core dump.. + */ +void dump_thread (struct pt_regs *regs, struct user *dump) +{ +#if 0 /* Later. XXX */ + dump->magic = CMAGIC; + dump->start_code = 0; + dump->start_stack = regs->gpr[GPR_SP]; + dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT; + dump->u_dsize = ((unsigned long) (current->mm->brk + + (PAGE_SIZE-1))) >> PAGE_SHIFT; + dump->u_dsize -= dump->u_tsize; + dump->u_ssize = 0; + + if (dump->start_stack < TASK_SIZE) + dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT; + + dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump); + dump->regs = *regs; + dump->u_fpvalid = 0; +#endif +} + +/* + * sys_execve() executes a new program. + */ +int sys_execve (char *name, char **argv, char **envp, struct pt_regs *regs) +{ + char *filename = getname (name); + int error = PTR_ERR (filename); + + if (! IS_ERR (filename)) { + error = do_execve (filename, argv, envp, regs); + putname (filename); + } + + return error; +} + + +/* + * These bracket the sleeping functions.. + */ +#define first_sched ((unsigned long)__sched_text_start) +#define last_sched ((unsigned long)__sched_text_end) + +unsigned long get_wchan (struct task_struct *p) +{ +#if 0 /* Barf. Figure out the stack-layout later. XXX */ + unsigned long fp, pc; + int count = 0; + + if (!p || p == current || p->state == TASK_RUNNING) + return 0; + + pc = thread_saved_pc (p); + + /* This quite disgusting function walks up the stack, following + saved return address, until it something that's out of bounds + (as defined by `first_sched' and `last_sched'). It then + returns the last PC that was in-bounds. */ + do { + if (fp < stack_page + sizeof (struct task_struct) || + fp >= 8184+stack_page) + return 0; + pc = ((unsigned long *)fp)[1]; + if (pc < first_sched || pc >= last_sched) + return pc; + fp = *(unsigned long *) fp; + } while (count++ < 16); +#endif + + return 0; +} diff --git a/arch/v850/kernel/procfs.c b/arch/v850/kernel/procfs.c new file mode 100644 index 00000000000..e6f9d060ad5 --- /dev/null +++ b/arch/v850/kernel/procfs.c @@ -0,0 +1,67 @@ +/* + * arch/v850/kernel/procfs.c -- Introspection functions for /proc filesystem + * + * Copyright (C) 2001,02 NEC Corporation + * Copyright (C) 2001,02 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include "mach.h" + +static int cpuinfo_print (struct seq_file *m, void *v) +{ + extern unsigned long loops_per_jiffy; + + seq_printf (m, "CPU-Family: v850\nCPU-Arch: %s\n", CPU_ARCH); + +#ifdef CPU_MODEL_LONG + seq_printf (m, "CPU-Model: %s (%s)\n", CPU_MODEL, CPU_MODEL_LONG); +#else + seq_printf (m, "CPU-Model: %s\n", CPU_MODEL); +#endif + +#ifdef CPU_CLOCK_FREQ + seq_printf (m, "CPU-Clock: %ld (%ld MHz)\n", + (long)CPU_CLOCK_FREQ, + (long)CPU_CLOCK_FREQ / 1000000); +#endif + + seq_printf (m, "BogoMips: %lu.%02lu\n", + loops_per_jiffy/(500000/HZ), + (loops_per_jiffy/(5000/HZ)) % 100); + +#ifdef PLATFORM_LONG + seq_printf (m, "Platform: %s (%s)\n", PLATFORM, PLATFORM_LONG); +#elif defined (PLATFORM) + seq_printf (m, "Platform: %s\n", PLATFORM); +#endif + + return 0; +} + +static void *cpuinfo_start (struct seq_file *m, loff_t *pos) +{ + return *pos < NR_CPUS ? ((void *) 0x12345678) : NULL; +} + +static void *cpuinfo_next (struct seq_file *m, void *v, loff_t *pos) +{ + ++*pos; + return cpuinfo_start (m, pos); +} + +static void cpuinfo_stop (struct seq_file *m, void *v) +{ +} + +struct seq_operations cpuinfo_op = { + .start = cpuinfo_start, + .next = cpuinfo_next, + .stop = cpuinfo_stop, + .show = cpuinfo_print +}; diff --git a/arch/v850/kernel/ptrace.c b/arch/v850/kernel/ptrace.c new file mode 100644 index 00000000000..8fa780757dc --- /dev/null +++ b/arch/v850/kernel/ptrace.c @@ -0,0 +1,282 @@ +/* + * arch/v850/kernel/ptrace.c -- `ptrace' system call + * + * Copyright (C) 2002,03,04 NEC Electronics Corporation + * Copyright (C) 2002,03,04 Miles Bader <miles@gnu.org> + * + * Derived from arch/mips/kernel/ptrace.c: + * + * Copyright (C) 1992 Ross Biro + * Copyright (C) Linus Torvalds + * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle + * Copyright (C) 1996 David S. Miller + * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com + * Copyright (C) 1999 MIPS Technologies, Inc. + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/sched.h> +#include <linux/smp_lock.h> +#include <linux/ptrace.h> + +#include <asm/errno.h> +#include <asm/ptrace.h> +#include <asm/processor.h> +#include <asm/uaccess.h> + +/* Returns the address where the register at REG_OFFS in P is stashed away. */ +static v850_reg_t *reg_save_addr (unsigned reg_offs, struct task_struct *t) +{ + struct pt_regs *regs; + + /* Three basic cases: + + (1) A register normally saved before calling the scheduler, is + available in the kernel entry pt_regs structure at the top + of the kernel stack. The kernel trap/irq exit path takes + care to save/restore almost all registers for ptrace'd + processes. + + (2) A call-clobbered register, where the process P entered the + kernel via [syscall] trap, is not stored anywhere; that's + OK, because such registers are not expected to be preserved + when the trap returns anyway (so we don't actually bother to + test for this case). + + (3) A few registers not used at all by the kernel, and so + normally never saved except by context-switches, are in the + context switch state. */ + + if (reg_offs == PT_CTPC || reg_offs == PT_CTPSW || reg_offs == PT_CTBP) + /* Register saved during context switch. */ + regs = thread_saved_regs (t); + else + /* Register saved during kernel entry (or not available). */ + regs = task_regs (t); + + return (v850_reg_t *)((char *)regs + reg_offs); +} + +/* Set the bits SET and clear the bits CLEAR in the v850e DIR + (`debug information register'). Returns the new value of DIR. */ +static inline v850_reg_t set_dir (v850_reg_t set, v850_reg_t clear) +{ + register v850_reg_t rval asm ("r10"); + register v850_reg_t arg0 asm ("r6") = set; + register v850_reg_t arg1 asm ("r7") = clear; + + /* The dbtrap handler has exactly this functionality when called + from kernel mode. 0xf840 is a `dbtrap' insn. */ + asm (".short 0xf840" : "=r" (rval) : "r" (arg0), "r" (arg1)); + + return rval; +} + +/* Makes sure hardware single-stepping is (globally) enabled. + Returns true if successful. */ +static inline int enable_single_stepping (void) +{ + static int enabled = 0; /* Remember whether we already did it. */ + if (! enabled) { + /* Turn on the SE (`single-step enable') bit, 0x100, in the + DIR (`debug information register'). This may fail if a + processor doesn't support it or something. We also try + to clear bit 0x40 (`INI'), which is necessary to use the + debug stuff on the v850e2; on the v850e, clearing 0x40 + shouldn't cause any problem. */ + v850_reg_t dir = set_dir (0x100, 0x40); + /* Make sure it really got set. */ + if (dir & 0x100) + enabled = 1; + } + return enabled; +} + +/* Try to set CHILD's single-step flag to VAL. Returns true if successful. */ +static int set_single_step (struct task_struct *t, int val) +{ + v850_reg_t *psw_addr = reg_save_addr(PT_PSW, t); + if (val) { + /* Make sure single-stepping is enabled. */ + if (! enable_single_stepping ()) + return 0; + /* Set T's single-step flag. */ + *psw_addr |= 0x800; + } else + *psw_addr &= ~0x800; + return 1; +} + +int sys_ptrace(long request, long pid, long addr, long data) +{ + struct task_struct *child; + int rval; + + lock_kernel(); + + if (request == PTRACE_TRACEME) { + /* are we already being traced? */ + if (current->ptrace & PT_PTRACED) { + rval = -EPERM; + goto out; + } + /* set the ptrace bit in the process flags. */ + current->ptrace |= PT_PTRACED; + rval = 0; + goto out; + } + rval = -ESRCH; + read_lock(&tasklist_lock); + child = find_task_by_pid(pid); + if (child) + get_task_struct(child); + read_unlock(&tasklist_lock); + if (!child) + goto out; + + rval = -EPERM; + if (pid == 1) /* you may not mess with init */ + goto out_tsk; + + if (request == PTRACE_ATTACH) { + rval = ptrace_attach(child); + goto out_tsk; + } + rval = ptrace_check_attach(child, request == PTRACE_KILL); + if (rval < 0) + goto out_tsk; + + switch (request) { + unsigned long val, copied; + + case PTRACE_PEEKTEXT: /* read word at location addr. */ + case PTRACE_PEEKDATA: + copied = access_process_vm(child, addr, &val, sizeof(val), 0); + rval = -EIO; + if (copied != sizeof(val)) + break; + rval = put_user(val, (unsigned long *)data); + goto out; + + case PTRACE_POKETEXT: /* write the word at location addr. */ + case PTRACE_POKEDATA: + rval = 0; + if (access_process_vm(child, addr, &data, sizeof(data), 1) + == sizeof(data)) + break; + rval = -EIO; + goto out; + + /* Read/write the word at location ADDR in the registers. */ + case PTRACE_PEEKUSR: + case PTRACE_POKEUSR: + rval = 0; + if (addr >= PT_SIZE && request == PTRACE_PEEKUSR) { + /* Special requests that don't actually correspond + to offsets in struct pt_regs. */ + if (addr == PT_TEXT_ADDR) + val = child->mm->start_code; + else if (addr == PT_DATA_ADDR) + val = child->mm->start_data; + else if (addr == PT_TEXT_LEN) + val = child->mm->end_code + - child->mm->start_code; + else + rval = -EIO; + } else if (addr >= 0 && addr < PT_SIZE && (addr & 0x3) == 0) { + v850_reg_t *reg_addr = reg_save_addr(addr, child); + if (request == PTRACE_PEEKUSR) + val = *reg_addr; + else + *reg_addr = data; + } else + rval = -EIO; + + if (rval == 0 && request == PTRACE_PEEKUSR) + rval = put_user (val, (unsigned long *)data); + goto out; + + /* Continue and stop at next (return from) syscall */ + case PTRACE_SYSCALL: + /* Restart after a signal. */ + case PTRACE_CONT: + /* Execute a single instruction. */ + case PTRACE_SINGLESTEP: + rval = -EIO; + if ((unsigned long) data > _NSIG) + break; + + /* Turn CHILD's single-step flag on or off. */ + if (! set_single_step (child, request == PTRACE_SINGLESTEP)) + break; + + if (request == PTRACE_SYSCALL) + set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); + else + clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); + + child->exit_code = data; + wake_up_process(child); + rval = 0; + break; + + /* + * make the child exit. Best I can do is send it a sigkill. + * perhaps it should be put in the status that it wants to + * exit. + */ + case PTRACE_KILL: + rval = 0; + if (child->exit_state == EXIT_ZOMBIE) /* already dead */ + break; + child->exit_code = SIGKILL; + wake_up_process(child); + break; + + case PTRACE_DETACH: /* detach a process that was attached. */ + set_single_step (child, 0); /* Clear single-step flag */ + rval = ptrace_detach(child, data); + break; + + default: + rval = -EIO; + goto out; + } + +out_tsk: + put_task_struct(child); +out: + unlock_kernel(); + return rval; +} + +asmlinkage void syscall_trace(void) +{ + if (!test_thread_flag(TIF_SYSCALL_TRACE)) + return; + if (!(current->ptrace & PT_PTRACED)) + return; + /* The 0x80 provides a way for the tracing parent to distinguish + between a syscall stop and SIGTRAP delivery */ + ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) + ? 0x80 : 0)); + /* + * this isn't the same as continuing with a signal, but it will do + * for normal use. strace only continues with a signal if the + * stopping signal is not SIGTRAP. -brl + */ + if (current->exit_code) { + send_sig(current->exit_code, current, 1); + current->exit_code = 0; + } +} + +void ptrace_disable (struct task_struct *child) +{ + /* nothing to do */ +} diff --git a/arch/v850/kernel/rte_cb.c b/arch/v850/kernel/rte_cb.c new file mode 100644 index 00000000000..7ba397f77ac --- /dev/null +++ b/arch/v850/kernel/rte_cb.c @@ -0,0 +1,200 @@ +/* + * include/asm-v850/rte_cb.c -- Midas lab RTE-CB series of evaluation boards + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/fs.h> +#include <linux/module.h> + +#include <asm/machdep.h> +#include <asm/v850e_uart.h> + +#include "mach.h" + +static void led_tick (void); + +/* LED access routines. */ +extern unsigned read_leds (int pos, char *buf, int len); +extern unsigned write_leds (int pos, const char *buf, int len); + +#ifdef CONFIG_RTE_CB_MULTI +extern void multi_init (void); +#endif + + +void __init rte_cb_early_init (void) +{ + v850e_intc_disable_irqs (); + +#ifdef CONFIG_RTE_CB_MULTI + multi_init (); +#endif +} + +void __init mach_setup (char **cmdline) +{ +#ifdef CONFIG_RTE_MB_A_PCI + /* Probe for Mother-A, and print a message if we find it. */ + *(volatile unsigned long *)MB_A_SRAM_ADDR = 0xDEADBEEF; + if (*(volatile unsigned long *)MB_A_SRAM_ADDR == 0xDEADBEEF) { + *(volatile unsigned long *)MB_A_SRAM_ADDR = 0x12345678; + if (*(volatile unsigned long *)MB_A_SRAM_ADDR == 0x12345678) + printk (KERN_INFO + " NEC SolutionGear/Midas lab" + " RTE-MOTHER-A motherboard\n"); + } +#endif /* CONFIG_RTE_MB_A_PCI */ + + mach_tick = led_tick; +} + +void machine_restart (char *__unused) +{ +#ifdef CONFIG_RESET_GUARD + disable_reset_guard (); +#endif + asm ("jmp r0"); /* Jump to the reset vector. */ +} + +EXPORT_SYMBOL(machine_restart); + +/* This says `HALt.' in LEDese. */ +static unsigned char halt_leds_msg[] = { 0x76, 0x77, 0x38, 0xF8 }; + +void machine_halt (void) +{ +#ifdef CONFIG_RESET_GUARD + disable_reset_guard (); +#endif + + /* Ignore all interrupts. */ + local_irq_disable (); + + /* Write a little message. */ + write_leds (0, halt_leds_msg, sizeof halt_leds_msg); + + /* Really halt. */ + for (;;) + asm ("halt; nop; nop; nop; nop; nop"); +} + +EXPORT_SYMBOL(machine_halt); + +void machine_power_off (void) +{ + machine_halt (); +} + +EXPORT_SYMBOL(machine_power_off); + + +/* Animated LED display for timer tick. */ + +#define TICK_UPD_FREQ 6 +static int tick_frames[][10] = { + { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, -1 }, + { 0x63, 0x5c, -1 }, + { 0x5c, 0x00, -1 }, + { 0x63, 0x00, -1 }, + { -1 } +}; + +static void led_tick () +{ + static unsigned counter = 0; + + if (++counter == (HZ / TICK_UPD_FREQ)) { + /* Which frame we're currently displaying for each digit. */ + static unsigned frame_nums[LED_NUM_DIGITS] = { 0 }; + /* Display image. */ + static unsigned char image[LED_NUM_DIGITS] = { 0 }; + unsigned char prev_image[LED_NUM_DIGITS]; + int write_to_leds = 1; /* true if we should actually display */ + int digit; + + /* We check to see if the physical LEDs contains what we last + wrote to them; if not, we suppress display (this is so that + users can write to the LEDs, and not have their output + overwritten). As a special case, we start writing again if + all the LEDs are blank, or our display image is all zeros + (indicating that this is the initial update, when the actual + LEDs might contain random data). */ + read_leds (0, prev_image, LED_NUM_DIGITS); + for (digit = 0; digit < LED_NUM_DIGITS; digit++) + if (image[digit] != prev_image[digit] + && image[digit] && prev_image[digit]) + { + write_to_leds = 0; + break; + } + + /* Update display image. */ + for (digit = 0; + digit < LED_NUM_DIGITS && tick_frames[digit][0] >= 0; + digit++) + { + int frame = tick_frames[digit][frame_nums[digit]]; + if (frame < 0) { + image[digit] = tick_frames[digit][0]; + frame_nums[digit] = 1; + } else { + image[digit] = frame; + frame_nums[digit]++; + break; + } + } + + if (write_to_leds) + /* Write the display image to the physical LEDs. */ + write_leds (0, image, LED_NUM_DIGITS); + + counter = 0; + } +} + + +/* Mother-A interrupts. */ + +#ifdef CONFIG_RTE_GBUS_INT + +#define L GBUS_INT_PRIORITY_LOW +#define M GBUS_INT_PRIORITY_MEDIUM +#define H GBUS_INT_PRIORITY_HIGH + +static struct gbus_int_irq_init gbus_irq_inits[] = { +#ifdef CONFIG_RTE_MB_A_PCI + { "MB_A_LAN", IRQ_MB_A_LAN, 1, 1, L }, + { "MB_A_PCI1", IRQ_MB_A_PCI1(0), IRQ_MB_A_PCI1_NUM, 1, L }, + { "MB_A_PCI2", IRQ_MB_A_PCI2(0), IRQ_MB_A_PCI2_NUM, 1, L }, + { "MB_A_EXT", IRQ_MB_A_EXT(0), IRQ_MB_A_EXT_NUM, 1, L }, + { "MB_A_USB_OC",IRQ_MB_A_USB_OC(0), IRQ_MB_A_USB_OC_NUM, 1, L }, + { "MB_A_PCMCIA_OC",IRQ_MB_A_PCMCIA_OC, 1, 1, L }, +#endif + { 0 } +}; +#define NUM_GBUS_IRQ_INITS \ + ((sizeof gbus_irq_inits / sizeof gbus_irq_inits[0]) - 1) + +static struct hw_interrupt_type gbus_hw_itypes[NUM_GBUS_IRQ_INITS]; + +#endif /* CONFIG_RTE_GBUS_INT */ + + +void __init rte_cb_init_irqs (void) +{ +#ifdef CONFIG_RTE_GBUS_INT + gbus_int_init_irqs (); + gbus_int_init_irq_types (gbus_irq_inits, gbus_hw_itypes); +#endif /* CONFIG_RTE_GBUS_INT */ +} diff --git a/arch/v850/kernel/rte_cb_leds.c b/arch/v850/kernel/rte_cb_leds.c new file mode 100644 index 00000000000..b662ad83894 --- /dev/null +++ b/arch/v850/kernel/rte_cb_leds.c @@ -0,0 +1,138 @@ +/* + * include/asm-v850/rte_cb_leds.c -- Midas lab RTE-CB board LED device support + * + * Copyright (C) 2002,03 NEC Electronics Corporation + * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/fs.h> +#include <linux/miscdevice.h> + +#include <asm/uaccess.h> + +#define LEDS_MINOR 169 /* Minor device number, using misc major. */ + +/* The actual LED hardware is write-only, so we hold the contents here too. */ +static unsigned char leds_image[LED_NUM_DIGITS] = { 0 }; + +/* Spinlock protecting the above leds. */ +static DEFINE_SPINLOCK(leds_lock); + +/* Common body of LED read/write functions, checks POS and LEN for + correctness, declares a variable using IMG_DECL, initialized pointing at + the POS position in the LED image buffer, and and iterates COPY_EXPR + until BUF is equal to the last buffer position; finally, sets LEN to be + the amount actually copied. IMG should be a variable declaration + (without an initializer or a terminating semicolon); POS, BUF, and LEN + should all be simple variables. */ +#define DO_LED_COPY(img_decl, pos, buf, len, copy_expr) \ +do { \ + if (pos > LED_NUM_DIGITS) \ + len = 0; \ + else { \ + if (pos + len > LED_NUM_DIGITS) \ + len = LED_NUM_DIGITS - pos; \ + \ + if (len > 0) { \ + int _flags; \ + const char *_end = buf + len; \ + img_decl = &leds_image[pos]; \ + \ + spin_lock_irqsave (leds_lock, _flags); \ + do \ + (copy_expr); \ + while (buf != _end); \ + spin_unlock_irqrestore (leds_lock, _flags); \ + } \ + } \ +} while (0) + +/* Read LEN bytes from LEDs at position POS, into BUF. + Returns actual amount read. */ +unsigned read_leds (unsigned pos, char *buf, unsigned len) +{ + DO_LED_COPY (const char *img, pos, buf, len, *buf++ = *img++); + return len; +} + +/* Write LEN bytes to LEDs at position POS, from BUF. + Returns actual amount written. */ +unsigned write_leds (unsigned pos, const char *buf, unsigned len) +{ + /* We write the actual LED values backwards, because + increasing memory addresses reflect LEDs right-to-left. */ + volatile char *led = &LED (LED_NUM_DIGITS - pos - 1); + /* We invert the value written to the hardware, because 1 = off, + and 0 = on. */ + DO_LED_COPY (char *img, pos, buf, len, + *led-- = 0xFF ^ (*img++ = *buf++)); + return len; +} + + +/* Device functions. */ + +static ssize_t leds_dev_read (struct file *file, char *buf, size_t len, + loff_t *pos) +{ + char temp_buf[LED_NUM_DIGITS]; + len = read_leds (*pos, temp_buf, len); + if (copy_to_user (buf, temp_buf, len)) + return -EFAULT; + *pos += len; + return len; +} + +static ssize_t leds_dev_write (struct file *file, const char *buf, size_t len, + loff_t *pos) +{ + char temp_buf[LED_NUM_DIGITS]; + if (copy_from_user (temp_buf, buf, min_t(size_t, len, LED_NUM_DIGITS))) + return -EFAULT; + len = write_leds (*pos, temp_buf, len); + *pos += len; + return len; +} + +static loff_t leds_dev_lseek (struct file *file, loff_t offs, int whence) +{ + if (whence == 1) + offs += file->f_pos; /* relative */ + else if (whence == 2) + offs += LED_NUM_DIGITS; /* end-relative */ + + if (offs < 0 || offs > LED_NUM_DIGITS) + return -EINVAL; + + file->f_pos = offs; + + return 0; +} + +static struct file_operations leds_fops = { + .read = leds_dev_read, + .write = leds_dev_write, + .llseek = leds_dev_lseek +}; + +static struct miscdevice leds_miscdev = { + .name = "leds", + .minor = LEDS_MINOR, + .fops = &leds_fops +}; + +int __init leds_dev_init (void) +{ + return misc_register (&leds_miscdev); +} + +__initcall (leds_dev_init); diff --git a/arch/v850/kernel/rte_cb_multi.c b/arch/v850/kernel/rte_cb_multi.c new file mode 100644 index 00000000000..963d55ab34c --- /dev/null +++ b/arch/v850/kernel/rte_cb_multi.c @@ -0,0 +1,121 @@ +/* + * include/asm-v850/rte_multi.c -- Support for Multi debugger monitor ROM + * on Midas lab RTE-CB series of evaluation boards + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/init.h> + +#include <asm/machdep.h> + +#define IRQ_ADDR(irq) (0x80 + (irq) * 0x10) + +/* A table of which interrupt vectors to install, since blindly + installing all of them makes the debugger stop working. This is a + list of offsets in the interrupt vector area; each entry means to + copy that particular 16-byte vector. An entry less than zero ends + the table. */ +static long multi_intv_install_table[] = { + /* Trap vectors */ + 0x40, 0x50, + +#ifdef CONFIG_RTE_CB_MULTI_DBTRAP + /* Illegal insn / dbtrap. These are used by multi, so only handle + them if configured to do so. */ + 0x60, +#endif + + /* GINT1 - GINT3 (note, not GINT0!) */ + IRQ_ADDR (IRQ_GINT(1)), + IRQ_ADDR (IRQ_GINT(2)), + IRQ_ADDR (IRQ_GINT(3)), + + /* Timer D interrupts (up to 4 timers) */ + IRQ_ADDR (IRQ_INTCMD(0)), +#if IRQ_INTCMD_NUM > 1 + IRQ_ADDR (IRQ_INTCMD(1)), +#if IRQ_INTCMD_NUM > 2 + IRQ_ADDR (IRQ_INTCMD(2)), +#if IRQ_INTCMD_NUM > 3 + IRQ_ADDR (IRQ_INTCMD(3)), +#endif +#endif +#endif + + /* UART interrupts (up to 3 channels) */ + IRQ_ADDR (IRQ_INTSER (0)), /* err */ + IRQ_ADDR (IRQ_INTSR (0)), /* rx */ + IRQ_ADDR (IRQ_INTST (0)), /* tx */ +#if IRQ_INTSR_NUM > 1 + IRQ_ADDR (IRQ_INTSER (1)), /* err */ + IRQ_ADDR (IRQ_INTSR (1)), /* rx */ + IRQ_ADDR (IRQ_INTST (1)), /* tx */ +#if IRQ_INTSR_NUM > 2 + IRQ_ADDR (IRQ_INTSER (2)), /* err */ + IRQ_ADDR (IRQ_INTSR (2)), /* rx */ + IRQ_ADDR (IRQ_INTST (2)), /* tx */ +#endif +#endif + + -1 +}; + +/* Early initialization for kernel using Multi debugger ROM monitor. */ +void __init multi_init (void) +{ + /* We're using the Multi debugger monitor, so we have to install + the interrupt vectors. The monitor doesn't allow them to be + initially downloaded into their final destination because + it's in the monitor's scratch-RAM area. Unfortunately, Multi + also doesn't deal correctly with ELF sections where the LMA + and VMA differ -- it just ignores the LMA -- so we can't use + that feature to work around the problem. What we do instead + is just put the interrupt vectors into a normal section, and + do the necessary copying and relocation here. Since the + interrupt vector basically only contains `jr' instructions + and no-ops, it's not that hard. */ + extern unsigned long _intv_load_start, _intv_start; + register unsigned long *src = &_intv_load_start; + register unsigned long *dst = (unsigned long *)INTV_BASE; + register unsigned long jr_fixup = (char *)&_intv_start - (char *)dst; + register long *ii; + + /* Copy interrupt vectors as instructed by multi_intv_install_table. */ + for (ii = multi_intv_install_table; *ii >= 0; ii++) { + /* Copy 16-byte interrupt vector at offset *ii. */ + int boffs; + for (boffs = 0; boffs < 0x10; boffs += sizeof *src) { + /* Copy a single word, fixing up the jump offs + if it's a `jr' instruction. */ + int woffs = (*ii + boffs) / sizeof *src; + unsigned long word = src[woffs]; + + if ((word & 0xFC0) == 0x780) { + /* A `jr' insn, fix up its offset (and yes, the + weird half-word swapping is intentional). */ + unsigned short hi = word & 0xFFFF; + unsigned short lo = word >> 16; + unsigned long udisp22 + = lo + ((hi & 0x3F) << 16); + long disp22 = (long)(udisp22 << 10) >> 10; + + disp22 += jr_fixup; + + hi = ((disp22 >> 16) & 0x3F) | 0x780; + lo = disp22 & 0xFFFF; + + word = hi + (lo << 16); + } + + dst[woffs] = word; + } + } +} diff --git a/arch/v850/kernel/rte_ma1_cb-rom.ld b/arch/v850/kernel/rte_ma1_cb-rom.ld new file mode 100644 index 00000000000..87b618f8253 --- /dev/null +++ b/arch/v850/kernel/rte_ma1_cb-rom.ld @@ -0,0 +1,14 @@ +/* Linker script for the Midas labs RTE-V850E/MA1-CB evaluation board + (CONFIG_RTE_CB_MA1), with kernel in ROM. */ + +MEMORY { + ROM : ORIGIN = 0x00000000, LENGTH = 0x00100000 + /* 1MB of SRAM. This memory is mirrored 4 times. */ + SRAM : ORIGIN = SRAM_ADDR, LENGTH = SRAM_SIZE + /* 32MB of SDRAM. */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +SECTIONS { + ROMK_SECTIONS(ROM, SRAM) +} diff --git a/arch/v850/kernel/rte_ma1_cb.c b/arch/v850/kernel/rte_ma1_cb.c new file mode 100644 index 00000000000..3873e276392 --- /dev/null +++ b/arch/v850/kernel/rte_ma1_cb.c @@ -0,0 +1,106 @@ +/* + * arch/v850/kernel/rte_ma1_cb.c -- Midas labs RTE-V850E/MA1-CB board + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/bootmem.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/ma1.h> +#include <asm/rte_ma1_cb.h> +#include <asm/v850e_timer_c.h> + +#include "mach.h" + + +/* SRAM and SDRAM are almost contiguous (with a small hole in between; + see mach_reserve_bootmem for details), so just use both as one big area. */ +#define RAM_START SRAM_ADDR +#define RAM_END (SDRAM_ADDR + SDRAM_SIZE) + + +void __init mach_early_init (void) +{ + rte_cb_early_init (); +} + +void __init mach_get_physical_ram (unsigned long *ram_start, + unsigned long *ram_len) +{ + *ram_start = RAM_START; + *ram_len = RAM_END - RAM_START; +} + +void __init mach_reserve_bootmem () +{ +#ifdef CONFIG_RTE_CB_MULTI + /* Prevent the kernel from touching the monitor's scratch RAM. */ + reserve_bootmem (MON_SCRATCH_ADDR, MON_SCRATCH_SIZE); +#endif + + /* The space between SRAM and SDRAM is filled with duplicate + images of SRAM. Prevent the kernel from using them. */ + reserve_bootmem (SRAM_ADDR + SRAM_SIZE, + SDRAM_ADDR - (SRAM_ADDR + SRAM_SIZE)); +} + +void mach_gettimeofday (struct timespec *tv) +{ + tv->tv_sec = 0; + tv->tv_nsec = 0; +} + +/* Called before configuring an on-chip UART. */ +void rte_ma1_cb_uart_pre_configure (unsigned chan, + unsigned cflags, unsigned baud) +{ + /* The RTE-MA1-CB connects some general-purpose I/O pins on the + CPU to the RTS/CTS lines of UART 0's serial connection. + I/O pins P42 and P43 are RTS and CTS respectively. */ + if (chan == 0) { + /* Put P42 & P43 in I/O port mode. */ + MA_PORT4_PMC &= ~0xC; + /* Make P42 an output, and P43 an input. */ + MA_PORT4_PM = (MA_PORT4_PM & ~0xC) | 0x8; + } + + /* Do pre-configuration for the actual UART. */ + ma_uart_pre_configure (chan, cflags, baud); +} + +void __init mach_init_irqs (void) +{ + unsigned tc; + + /* Initialize interrupts. */ + ma_init_irqs (); + rte_cb_init_irqs (); + + /* Use falling-edge-sensitivity for interrupts . */ + V850E_TIMER_C_SESC (0) &= ~0xC; + V850E_TIMER_C_SESC (1) &= ~0xF; + + /* INTP000-INTP011 are shared with `Timer C', so we have to set + up Timer C to pass them through as raw interrupts. */ + for (tc = 0; tc < 2; tc++) + /* Turn on the timer. */ + V850E_TIMER_C_TMCC0 (tc) |= V850E_TIMER_C_TMCC0_CAE; + + /* Make sure the relevant port0/port1 pins are assigned + interrupt duty. We used INTP001-INTP011 (don't screw with + INTP000 because the monitor uses it). */ + MA_PORT0_PMC |= 0x4; /* P02 (INTP001) in IRQ mode. */ + MA_PORT1_PMC |= 0x6; /* P11 (INTP010) & P12 (INTP011) in IRQ mode.*/ +} diff --git a/arch/v850/kernel/rte_ma1_cb.ld b/arch/v850/kernel/rte_ma1_cb.ld new file mode 100644 index 00000000000..c8e16d16be4 --- /dev/null +++ b/arch/v850/kernel/rte_ma1_cb.ld @@ -0,0 +1,57 @@ +/* Linker script for the Midas labs RTE-V850E/MA1-CB evaluation board + (CONFIG_RTE_CB_MA1), with kernel in SDRAM, under Multi debugger. */ + +MEMORY { + /* 1MB of SRAM; we can't use the last 32KB, because it's used by + the monitor scratch-RAM. This memory is mirrored 4 times. */ + SRAM : ORIGIN = SRAM_ADDR, LENGTH = (SRAM_SIZE - MON_SCRATCH_SIZE) + /* Monitor scratch RAM; only the interrupt vectors should go here. */ + MRAM : ORIGIN = MON_SCRATCH_ADDR, LENGTH = MON_SCRATCH_SIZE + /* 32MB of SDRAM. */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +#ifdef CONFIG_RTE_CB_MA1_KSRAM +# define KRAM SRAM +#else +# define KRAM SDRAM +#endif + +SECTIONS { + /* We can't use RAMK_KRAM_CONTENTS because that puts the whole + kernel in a single ELF segment, and the Multi debugger (which + we use to load the kernel) appears to have bizarre problems + dealing with it. */ + + .text : { + __kram_start = . ; + TEXT_CONTENTS + } > KRAM + + .data : { + DATA_CONTENTS + BSS_CONTENTS + RAMK_INIT_CONTENTS + __kram_end = . ; + BOOTMAP_CONTENTS + + /* The address at which the interrupt vectors are initially + loaded by the loader. We can't load the interrupt vectors + directly into their target location, because the monitor + ROM for the GHS Multi debugger barfs if we try. + Unfortunately, Multi also doesn't deal correctly with ELF + sections where the LMA and VMA differ (it just ignores the + LMA), so we can't use that feature to work around the + problem! What we do instead is just put the interrupt + vectors into a normal section, and have the + `mach_early_init' function for Midas boards do the + necessary copying and relocation at runtime (this section + basically only contains `jr' instructions, so it's not + that hard). */ + . = ALIGN (0x10) ; + __intv_load_start = . ; + INTV_CONTENTS + } > KRAM + + .root ALIGN (4096) : { ROOT_FS_CONTENTS } > SDRAM +} diff --git a/arch/v850/kernel/rte_mb_a_pci.c b/arch/v850/kernel/rte_mb_a_pci.c new file mode 100644 index 00000000000..074b50abc89 --- /dev/null +++ b/arch/v850/kernel/rte_mb_a_pci.c @@ -0,0 +1,796 @@ +/* + * arch/v850/kernel/mb_a_pci.c -- PCI support for Midas lab RTE-MOTHER-A board + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/pci.h> + +#include <asm/machdep.h> + +/* __nomods_init is like __devinit, but is a no-op when modules are enabled. + This is used by some routines that can be called either during boot + or by a module. */ +#ifdef CONFIG_MODULES +#define __nomods_init /*nothing*/ +#else +#define __nomods_init __devinit +#endif + +/* PCI devices on the Mother-A board can only do DMA to/from the MB SRAM + (the RTE-V850E/MA1-CB cpu board doesn't support PCI access to + CPU-board memory), and since linux DMA buffers are allocated in + normal kernel memory, we basically have to copy DMA blocks around + (this is like a `bounce buffer'). When a DMA block is `mapped', we + allocate an identically sized block in MB SRAM, and if we're doing + output to the device, copy the CPU-memory block to the MB-SRAM block. + When an active block is `unmapped', we will copy the block back to + CPU memory if necessary, and then deallocate the MB SRAM block. + Ack. */ + +/* Where the motherboard SRAM is in the PCI-bus address space (the + first 512K of it is also mapped at PCI address 0). */ +#define PCI_MB_SRAM_ADDR 0x800000 + +/* Convert CPU-view MB SRAM address to/from PCI-view addresses of the + same memory. */ +#define MB_SRAM_TO_PCI(mb_sram_addr) \ + ((dma_addr_t)mb_sram_addr - MB_A_SRAM_ADDR + PCI_MB_SRAM_ADDR) +#define PCI_TO_MB_SRAM(pci_addr) \ + (void *)(pci_addr - PCI_MB_SRAM_ADDR + MB_A_SRAM_ADDR) + +static void pcibios_assign_resources (void); + +struct mb_pci_dev_irq { + unsigned dev; /* PCI device number */ + unsigned irq_base; /* First IRQ */ + unsigned query_pin; /* True if we should read the device's + Interrupt Pin info, and allocate + interrupt IRQ_BASE + PIN. */ +}; + +/* PCI interrupts are mapped statically to GBUS interrupts. */ +static struct mb_pci_dev_irq mb_pci_dev_irqs[] = { + /* Motherboard SB82558 ethernet controller */ + { 10, IRQ_MB_A_LAN, 0 }, + /* PCI slot 1 */ + { 8, IRQ_MB_A_PCI1(0), 1 }, + /* PCI slot 2 */ + { 9, IRQ_MB_A_PCI2(0), 1 } +}; +#define NUM_MB_PCI_DEV_IRQS \ + (sizeof mb_pci_dev_irqs / sizeof mb_pci_dev_irqs[0]) + + +/* PCI configuration primitives. */ + +#define CONFIG_DMCFGA(bus, devfn, offs) \ + (0x80000000 \ + | ((offs) & ~0x3) \ + | ((devfn) << 8) \ + | ((bus)->number << 16)) + +static int +mb_pci_read (struct pci_bus *bus, unsigned devfn, int offs, int size, u32 *rval) +{ + u32 addr; + int flags; + + local_irq_save (flags); + + MB_A_PCI_PCICR = 0x7; + MB_A_PCI_DMCFGA = CONFIG_DMCFGA (bus, devfn, offs); + + addr = MB_A_PCI_IO_ADDR + (offs & 0x3); + + switch (size) { + case 1: *rval = *(volatile u8 *)addr; break; + case 2: *rval = *(volatile u16 *)addr; break; + case 4: *rval = *(volatile u32 *)addr; break; + } + + if (MB_A_PCI_PCISR & 0x2000) { + MB_A_PCI_PCISR = 0x2000; + *rval = ~0; + } + + MB_A_PCI_DMCFGA = 0; + + local_irq_restore (flags); + + return PCIBIOS_SUCCESSFUL; +} + +static int +mb_pci_write (struct pci_bus *bus, unsigned devfn, int offs, int size, u32 val) +{ + u32 addr; + int flags; + + local_irq_save (flags); + + MB_A_PCI_PCICR = 0x7; + MB_A_PCI_DMCFGA = CONFIG_DMCFGA (bus, devfn, offs); + + addr = MB_A_PCI_IO_ADDR + (offs & 0x3); + + switch (size) { + case 1: *(volatile u8 *)addr = val; break; + case 2: *(volatile u16 *)addr = val; break; + case 4: *(volatile u32 *)addr = val; break; + } + + if (MB_A_PCI_PCISR & 0x2000) + MB_A_PCI_PCISR = 0x2000; + + MB_A_PCI_DMCFGA = 0; + + local_irq_restore (flags); + + return PCIBIOS_SUCCESSFUL; +} + +static struct pci_ops mb_pci_config_ops = { + .read = mb_pci_read, + .write = mb_pci_write, +}; + + +/* PCI Initialization. */ + +static struct pci_bus *mb_pci_bus = 0; + +/* Do initial PCI setup. */ +static int __devinit pcibios_init (void) +{ + u32 id = MB_A_PCI_PCIHIDR; + u16 vendor = id & 0xFFFF; + u16 device = (id >> 16) & 0xFFFF; + + if (vendor == PCI_VENDOR_ID_PLX && device == PCI_DEVICE_ID_PLX_9080) { + printk (KERN_INFO + "PCI: PLX Technology PCI9080 HOST/PCI bridge\n"); + + MB_A_PCI_PCICR = 0x147; + + MB_A_PCI_PCIBAR0 = 0x007FFF00; + MB_A_PCI_PCIBAR1 = 0x0000FF00; + MB_A_PCI_PCIBAR2 = 0x00800000; + + MB_A_PCI_PCILTR = 0x20; + + MB_A_PCI_PCIPBAM |= 0x3; + + MB_A_PCI_PCISR = ~0; /* Clear errors. */ + + /* Reprogram the motherboard's IO/config address space, + as we don't support the GCS7 address space that the + default uses. */ + + /* Significant address bits used for decoding PCI GCS5 space + accessess. */ + MB_A_PCI_DMRR = ~(MB_A_PCI_MEM_SIZE - 1); + + /* I don't understand this, but the SolutionGear example code + uses such an offset, and it doesn't work without it. XXX */ +#if GCS5_SIZE == 0x00800000 +#define GCS5_CFG_OFFS 0x00800000 +#else +#define GCS5_CFG_OFFS 0 +#endif + + /* Address bit values for matching. Note that we have to give + the address from the motherboard's point of view, which is + different than the CPU's. */ + /* PCI memory space. */ + MB_A_PCI_DMLBAM = GCS5_CFG_OFFS + 0x0; + /* PCI I/O space. */ + MB_A_PCI_DMLBAI = + GCS5_CFG_OFFS + (MB_A_PCI_IO_ADDR - GCS5_ADDR); + + mb_pci_bus = pci_scan_bus (0, &mb_pci_config_ops, 0); + + pcibios_assign_resources (); + } else + printk (KERN_ERR "PCI: HOST/PCI bridge not found\n"); + + return 0; +} + +subsys_initcall (pcibios_init); + +char __devinit *pcibios_setup (char *option) +{ + /* Don't handle any options. */ + return option; +} + + +int __nomods_init pcibios_enable_device (struct pci_dev *dev, int mask) +{ + u16 cmd, old_cmd; + int idx; + struct resource *r; + + pci_read_config_word(dev, PCI_COMMAND, &cmd); + old_cmd = cmd; + for (idx = 0; idx < 6; idx++) { + r = &dev->resource[idx]; + if (!r->start && r->end) { + printk(KERN_ERR "PCI: Device %s not available because " + "of resource collisions\n", pci_name(dev)); + return -EINVAL; + } + if (r->flags & IORESOURCE_IO) + cmd |= PCI_COMMAND_IO; + if (r->flags & IORESOURCE_MEM) + cmd |= PCI_COMMAND_MEMORY; + } + if (cmd != old_cmd) { + printk("PCI: Enabling device %s (%04x -> %04x)\n", + pci_name(dev), old_cmd, cmd); + pci_write_config_word(dev, PCI_COMMAND, cmd); + } + return 0; +} + + +/* Resource allocation. */ +static void __devinit pcibios_assign_resources (void) +{ + struct pci_dev *dev = NULL; + struct resource *r; + + for_each_pci_dev(dev) { + unsigned di_num; + unsigned class = dev->class >> 8; + + if (class && class != PCI_CLASS_BRIDGE_HOST) { + unsigned r_num; + for(r_num = 0; r_num < 6; r_num++) { + r = &dev->resource[r_num]; + if (!r->start && r->end) + pci_assign_resource (dev, r_num); + } + } + + /* Assign interrupts. */ + for (di_num = 0; di_num < NUM_MB_PCI_DEV_IRQS; di_num++) { + struct mb_pci_dev_irq *di = &mb_pci_dev_irqs[di_num]; + + if (di->dev == PCI_SLOT (dev->devfn)) { + unsigned irq = di->irq_base; + + if (di->query_pin) { + /* Find out which interrupt pin + this device uses (each PCI + slot has 4). */ + u8 irq_pin; + + pci_read_config_byte (dev, + PCI_INTERRUPT_PIN, + &irq_pin); + + if (irq_pin == 0) + /* Doesn't use interrupts. */ + continue; + else + irq += irq_pin - 1; + } + + pcibios_update_irq (dev, irq); + } + } + } +} + +void __devinit pcibios_update_irq (struct pci_dev *dev, int irq) +{ + dev->irq = irq; + pci_write_config_byte (dev, PCI_INTERRUPT_LINE, irq); +} + +void __devinit +pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region, + struct resource *res) +{ + unsigned long offset = 0; + + if (res->flags & IORESOURCE_IO) { + offset = MB_A_PCI_IO_ADDR; + } else if (res->flags & IORESOURCE_MEM) { + offset = MB_A_PCI_MEM_ADDR; + } + + region->start = res->start - offset; + region->end = res->end - offset; +} + + +/* Stubs for things we don't use. */ + +/* Called after each bus is probed, but before its children are examined. */ +void pcibios_fixup_bus(struct pci_bus *b) +{ +} + +void +pcibios_align_resource (void *data, struct resource *res, + unsigned long size, unsigned long align) +{ +} + +void pcibios_set_master (struct pci_dev *dev) +{ +} + + +/* Mother-A SRAM memory allocation. This is a simple first-fit allocator. */ + +/* A memory free-list node. */ +struct mb_sram_free_area { + void *mem; + unsigned long size; + struct mb_sram_free_area *next; +}; + +/* The tail of the free-list, which starts out containing all the SRAM. */ +static struct mb_sram_free_area mb_sram_free_tail = { + (void *)MB_A_SRAM_ADDR, MB_A_SRAM_SIZE, 0 +}; + +/* The free-list. */ +static struct mb_sram_free_area *mb_sram_free_areas = &mb_sram_free_tail; + +/* The free-list of free free-list nodes. (:-) */ +static struct mb_sram_free_area *mb_sram_free_free_areas = 0; + +/* Spinlock protecting the above globals. */ +static DEFINE_SPINLOCK(mb_sram_lock); + +/* Allocate a memory block at least SIZE bytes long in the Mother-A SRAM + space. */ +static void *alloc_mb_sram (size_t size) +{ + struct mb_sram_free_area *prev, *fa; + int flags; + void *mem = 0; + + spin_lock_irqsave (mb_sram_lock, flags); + + /* Look for a free area that can contain SIZE bytes. */ + for (prev = 0, fa = mb_sram_free_areas; fa; prev = fa, fa = fa->next) + if (fa->size >= size) { + /* Found one! */ + mem = fa->mem; + + if (fa->size == size) { + /* In fact, it fits exactly, so remove + this node from the free-list. */ + if (prev) + prev->next = fa->next; + else + mb_sram_free_areas = fa->next; + /* Put it on the free-list-entry-free-list. */ + fa->next = mb_sram_free_free_areas; + mb_sram_free_free_areas = fa; + } else { + /* FA is bigger than SIZE, so just + reduce its size to account for this + allocation. */ + fa->mem += size; + fa->size -= size; + } + + break; + } + + spin_unlock_irqrestore (mb_sram_lock, flags); + + return mem; +} + +/* Return the memory area MEM of size SIZE to the MB SRAM free pool. */ +static void free_mb_sram (void *mem, size_t size) +{ + struct mb_sram_free_area *prev, *fa, *new_fa; + int flags; + void *end = mem + size; + + spin_lock_irqsave (mb_sram_lock, flags); + + retry: + /* Find an adjacent free-list entry. */ + for (prev = 0, fa = mb_sram_free_areas; fa; prev = fa, fa = fa->next) + if (fa->mem == end) { + /* FA is just after MEM, grow down to encompass it. */ + fa->mem = mem; + fa->size += size; + goto done; + } else if (fa->mem + fa->size == mem) { + struct mb_sram_free_area *next_fa = fa->next; + + /* FA is just before MEM, expand to encompass it. */ + fa->size += size; + + /* See if FA can now be merged with its successor. */ + if (next_fa && fa->mem + fa->size == next_fa->mem) { + /* Yup; merge NEXT_FA's info into FA. */ + fa->size += next_fa->size; + fa->next = next_fa->next; + /* Free NEXT_FA. */ + next_fa->next = mb_sram_free_free_areas; + mb_sram_free_free_areas = next_fa; + } + goto done; + } else if (fa->mem > mem) + /* We've reached the right spot in the free-list + without finding an adjacent free-area, so add + a new free area to hold mem. */ + break; + + /* Make a new free-list entry. */ + + /* First, get a free-list entry. */ + if (! mb_sram_free_free_areas) { + /* There are none, so make some. */ + void *block; + size_t block_size = sizeof (struct mb_sram_free_area) * 8; + + /* Don't hold the lock while calling kmalloc (I'm not + sure whether it would be a problem, since we use + GFP_ATOMIC, but it makes me nervous). */ + spin_unlock_irqrestore (mb_sram_lock, flags); + + block = kmalloc (block_size, GFP_ATOMIC); + if (! block) + panic ("free_mb_sram: can't allocate free-list entry"); + + /* Now get the lock back. */ + spin_lock_irqsave (mb_sram_lock, flags); + + /* Add the new free free-list entries. */ + while (block_size > 0) { + struct mb_sram_free_area *nfa = block; + nfa->next = mb_sram_free_free_areas; + mb_sram_free_free_areas = nfa; + block += sizeof *nfa; + block_size -= sizeof *nfa; + } + + /* Since we dropped the lock to call kmalloc, the + free-list could have changed, so retry from the + beginning. */ + goto retry; + } + + /* Remove NEW_FA from the free-list of free-list entries. */ + new_fa = mb_sram_free_free_areas; + mb_sram_free_free_areas = new_fa->next; + + /* NEW_FA initially holds only MEM. */ + new_fa->mem = mem; + new_fa->size = size; + + /* Insert NEW_FA in the free-list between PREV and FA. */ + new_fa->next = fa; + if (prev) + prev->next = new_fa; + else + mb_sram_free_areas = new_fa; + + done: + spin_unlock_irqrestore (mb_sram_lock, flags); +} + + +/* Maintainence of CPU -> Mother-A DMA mappings. */ + +struct dma_mapping { + void *cpu_addr; + void *mb_sram_addr; + size_t size; + struct dma_mapping *next; +}; + +/* A list of mappings from CPU addresses to MB SRAM addresses for active + DMA blocks (that have been `granted' to the PCI device). */ +static struct dma_mapping *active_dma_mappings = 0; + +/* A list of free mapping objects. */ +static struct dma_mapping *free_dma_mappings = 0; + +/* Spinlock protecting the above globals. */ +static DEFINE_SPINLOCK(dma_mappings_lock); + +static struct dma_mapping *new_dma_mapping (size_t size) +{ + int flags; + struct dma_mapping *mapping; + void *mb_sram_block = alloc_mb_sram (size); + + if (! mb_sram_block) + return 0; + + spin_lock_irqsave (dma_mappings_lock, flags); + + if (! free_dma_mappings) { + /* We're out of mapping structures, make more. */ + void *mblock; + size_t mblock_size = sizeof (struct dma_mapping) * 8; + + /* Don't hold the lock while calling kmalloc (I'm not + sure whether it would be a problem, since we use + GFP_ATOMIC, but it makes me nervous). */ + spin_unlock_irqrestore (dma_mappings_lock, flags); + + mblock = kmalloc (mblock_size, GFP_ATOMIC); + if (! mblock) { + free_mb_sram (mb_sram_block, size); + return 0; + } + + /* Get the lock back. */ + spin_lock_irqsave (dma_mappings_lock, flags); + + /* Add the new mapping structures to the free-list. */ + while (mblock_size > 0) { + struct dma_mapping *fm = mblock; + fm->next = free_dma_mappings; + free_dma_mappings = fm; + mblock += sizeof *fm; + mblock_size -= sizeof *fm; + } + } + + /* Get a mapping struct from the freelist. */ + mapping = free_dma_mappings; + free_dma_mappings = mapping->next; + + /* Initialize the mapping. Other fields should be filled in by + caller. */ + mapping->mb_sram_addr = mb_sram_block; + mapping->size = size; + + /* Add it to the list of active mappings. */ + mapping->next = active_dma_mappings; + active_dma_mappings = mapping; + + spin_unlock_irqrestore (dma_mappings_lock, flags); + + return mapping; +} + +static struct dma_mapping *find_dma_mapping (void *mb_sram_addr) +{ + int flags; + struct dma_mapping *mapping; + + spin_lock_irqsave (dma_mappings_lock, flags); + + for (mapping = active_dma_mappings; mapping; mapping = mapping->next) + if (mapping->mb_sram_addr == mb_sram_addr) { + spin_unlock_irqrestore (dma_mappings_lock, flags); + return mapping; + } + + panic ("find_dma_mapping: unmapped PCI DMA addr 0x%x", + MB_SRAM_TO_PCI (mb_sram_addr)); +} + +static struct dma_mapping *deactivate_dma_mapping (void *mb_sram_addr) +{ + int flags; + struct dma_mapping *mapping, *prev; + + spin_lock_irqsave (dma_mappings_lock, flags); + + for (prev = 0, mapping = active_dma_mappings; + mapping; + prev = mapping, mapping = mapping->next) + { + if (mapping->mb_sram_addr == mb_sram_addr) { + /* This is the MAPPING; deactivate it. */ + if (prev) + prev->next = mapping->next; + else + active_dma_mappings = mapping->next; + + spin_unlock_irqrestore (dma_mappings_lock, flags); + + return mapping; + } + } + + panic ("deactivate_dma_mapping: unmapped PCI DMA addr 0x%x", + MB_SRAM_TO_PCI (mb_sram_addr)); +} + +/* Return MAPPING to the freelist. */ +static inline void +free_dma_mapping (struct dma_mapping *mapping) +{ + int flags; + + free_mb_sram (mapping->mb_sram_addr, mapping->size); + + spin_lock_irqsave (dma_mappings_lock, flags); + + mapping->next = free_dma_mappings; + free_dma_mappings = mapping; + + spin_unlock_irqrestore (dma_mappings_lock, flags); +} + + +/* Single PCI DMA mappings. */ + +/* `Grant' to PDEV the memory block at CPU_ADDR, for doing DMA. The + 32-bit PCI bus mastering address to use is returned. the device owns + this memory until either pci_unmap_single or pci_dma_sync_single is + performed. */ +dma_addr_t +pci_map_single (struct pci_dev *pdev, void *cpu_addr, size_t size, int dir) +{ + struct dma_mapping *mapping = new_dma_mapping (size); + + if (! mapping) + return 0; + + mapping->cpu_addr = cpu_addr; + + if (dir == PCI_DMA_BIDIRECTIONAL || dir == PCI_DMA_TODEVICE) + memcpy (mapping->mb_sram_addr, cpu_addr, size); + + return MB_SRAM_TO_PCI (mapping->mb_sram_addr); +} + +/* Return to the CPU the PCI DMA memory block previously `granted' to + PDEV, at DMA_ADDR. */ +void pci_unmap_single (struct pci_dev *pdev, dma_addr_t dma_addr, size_t size, + int dir) +{ + void *mb_sram_addr = PCI_TO_MB_SRAM (dma_addr); + struct dma_mapping *mapping = deactivate_dma_mapping (mb_sram_addr); + + if (size != mapping->size) + panic ("pci_unmap_single: size (%d) doesn't match" + " size of mapping at PCI DMA addr 0x%x (%d)\n", + size, dma_addr, mapping->size); + + /* Copy back the DMA'd contents if necessary. */ + if (dir == PCI_DMA_BIDIRECTIONAL || dir == PCI_DMA_FROMDEVICE) + memcpy (mapping->cpu_addr, mb_sram_addr, size); + + /* Return mapping to the freelist. */ + free_dma_mapping (mapping); +} + +/* Make physical memory consistent for a single streaming mode DMA + translation after a transfer. + + If you perform a pci_map_single() but wish to interrogate the + buffer using the cpu, yet do not wish to teardown the PCI dma + mapping, you must call this function before doing so. At the next + point you give the PCI dma address back to the card, you must first + perform a pci_dma_sync_for_device, and then the device again owns + the buffer. */ +void +pci_dma_sync_single_for_cpu (struct pci_dev *pdev, dma_addr_t dma_addr, size_t size, + int dir) +{ + void *mb_sram_addr = PCI_TO_MB_SRAM (dma_addr); + struct dma_mapping *mapping = find_dma_mapping (mb_sram_addr); + + /* Synchronize the DMA buffer with the CPU buffer if necessary. */ + if (dir == PCI_DMA_FROMDEVICE) + memcpy (mapping->cpu_addr, mb_sram_addr, size); + else if (dir == PCI_DMA_TODEVICE) + ; /* nothing to do */ + else + panic("pci_dma_sync_single: unsupported sync dir: %d", dir); +} + +void +pci_dma_sync_single_for_device (struct pci_dev *pdev, dma_addr_t dma_addr, size_t size, + int dir) +{ + void *mb_sram_addr = PCI_TO_MB_SRAM (dma_addr); + struct dma_mapping *mapping = find_dma_mapping (mb_sram_addr); + + /* Synchronize the DMA buffer with the CPU buffer if necessary. */ + if (dir == PCI_DMA_FROMDEVICE) + ; /* nothing to do */ + else if (dir == PCI_DMA_TODEVICE) + memcpy (mb_sram_addr, mapping->cpu_addr, size); + else + panic("pci_dma_sync_single: unsupported sync dir: %d", dir); +} + + +/* Scatter-gather PCI DMA mappings. */ + +/* Do multiple DMA mappings at once. */ +int +pci_map_sg (struct pci_dev *pdev, struct scatterlist *sg, int sg_len, int dir) +{ + BUG (); + return 0; +} + +/* Unmap multiple DMA mappings at once. */ +void +pci_unmap_sg (struct pci_dev *pdev, struct scatterlist *sg, int sg_len,int dir) +{ + BUG (); +} + +/* Make physical memory consistent for a set of streaming mode DMA + translations after a transfer. The same as pci_dma_sync_single_* but + for a scatter-gather list, same rules and usage. */ + +void +pci_dma_sync_sg_for_cpu (struct pci_dev *dev, struct scatterlist *sg, int sg_len, + int dir) +{ + BUG (); +} + +void +pci_dma_sync_sg_for_device (struct pci_dev *dev, struct scatterlist *sg, int sg_len, + int dir) +{ + BUG (); +} + + +/* PCI mem mapping. */ + +/* Allocate and map kernel buffer using consistent mode DMA for PCI + device. Returns non-NULL cpu-view pointer to the buffer if + successful and sets *DMA_ADDR to the pci side dma address as well, + else DMA_ADDR is undefined. */ +void * +pci_alloc_consistent (struct pci_dev *pdev, size_t size, dma_addr_t *dma_addr) +{ + void *mb_sram_mem = alloc_mb_sram (size); + if (mb_sram_mem) + *dma_addr = MB_SRAM_TO_PCI (mb_sram_mem); + return mb_sram_mem; +} + +/* Free and unmap a consistent DMA buffer. CPU_ADDR and DMA_ADDR must + be values that were returned from pci_alloc_consistent. SIZE must be + the same as what as passed into pci_alloc_consistent. References to + the memory and mappings assosciated with CPU_ADDR or DMA_ADDR past + this call are illegal. */ +void +pci_free_consistent (struct pci_dev *pdev, size_t size, void *cpu_addr, + dma_addr_t dma_addr) +{ + void *mb_sram_mem = PCI_TO_MB_SRAM (dma_addr); + free_mb_sram (mb_sram_mem, size); +} + + +/* symbol exports (for modules) */ + +EXPORT_SYMBOL (pci_map_single); +EXPORT_SYMBOL (pci_unmap_single); +EXPORT_SYMBOL (pci_alloc_consistent); +EXPORT_SYMBOL (pci_free_consistent); +EXPORT_SYMBOL (pci_dma_sync_single_for_cpu); +EXPORT_SYMBOL (pci_dma_sync_single_for_device); diff --git a/arch/v850/kernel/rte_me2_cb.c b/arch/v850/kernel/rte_me2_cb.c new file mode 100644 index 00000000000..faaf3d95e6c --- /dev/null +++ b/arch/v850/kernel/rte_me2_cb.c @@ -0,0 +1,300 @@ +/* + * arch/v850/kernel/rte_me2_cb.c -- Midas labs RTE-V850E/ME2-CB board + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/irq.h> +#include <linux/fs.h> +#include <linux/major.h> +#include <linux/sched.h> +#include <linux/delay.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/me2.h> +#include <asm/rte_me2_cb.h> +#include <asm/machdep.h> +#include <asm/v850e_intc.h> +#include <asm/v850e_cache.h> +#include <asm/irq.h> + +#include "mach.h" + +extern unsigned long *_intv_start; +extern unsigned long *_intv_end; + +/* LED access routines. */ +extern unsigned read_leds (int pos, char *buf, int len); +extern unsigned write_leds (int pos, const char *buf, int len); + + +/* SDRAM are almost contiguous (with a small hole in between; + see mach_reserve_bootmem for details), so just use both as one big area. */ +#define RAM_START SDRAM_ADDR +#define RAM_END (SDRAM_ADDR + SDRAM_SIZE) + + +void __init mach_get_physical_ram (unsigned long *ram_start, + unsigned long *ram_len) +{ + *ram_start = RAM_START; + *ram_len = RAM_END - RAM_START; +} + +void mach_gettimeofday (struct timespec *tv) +{ + tv->tv_sec = 0; + tv->tv_nsec = 0; +} + +/* Called before configuring an on-chip UART. */ +void rte_me2_cb_uart_pre_configure (unsigned chan, + unsigned cflags, unsigned baud) +{ + /* The RTE-V850E/ME2-CB connects some general-purpose I/O + pins on the CPU to the RTS/CTS lines of UARTB channel 0's + serial connection. + I/O pins P21 and P22 are RTS and CTS respectively. */ + if (chan == 0) { + /* Put P21 & P22 in I/O port mode. */ + ME2_PORT2_PMC &= ~0x6; + /* Make P21 and output, and P22 an input. */ + ME2_PORT2_PM = (ME2_PORT2_PM & ~0xC) | 0x4; + } + + me2_uart_pre_configure (chan, cflags, baud); +} + +void __init mach_init_irqs (void) +{ + /* Initialize interrupts. */ + me2_init_irqs (); + rte_me2_cb_init_irqs (); +} + +#ifdef CONFIG_ROM_KERNEL +/* Initialization for kernel in ROM. */ +static inline rom_kernel_init (void) +{ + /* If the kernel is in ROM, we have to copy any initialized data + from ROM into RAM. */ + extern unsigned long _data_load_start, _sdata, _edata; + register unsigned long *src = &_data_load_start; + register unsigned long *dst = &_sdata, *end = &_edata; + + while (dst != end) + *dst++ = *src++; +} +#endif /* CONFIG_ROM_KERNEL */ + +static void install_interrupt_vectors (void) +{ + unsigned long *p1, *p2; + + ME2_IRAMM = 0x03; /* V850E/ME2 iRAM write mode */ + + /* vector copy to iRAM */ + p1 = (unsigned long *)0; /* v85x vector start */ + p2 = (unsigned long *)&_intv_start; + while (p2 < (unsigned long *)&_intv_end) + *p1++ = *p2++; + + ME2_IRAMM = 0x00; /* V850E/ME2 iRAM read mode */ +} + +/* CompactFlash */ + +static void cf_power_on (void) +{ + /* CF card detected? */ + if (CB_CF_STS0 & 0x0030) + return; + + CB_CF_REG0 = 0x0002; /* reest on */ + mdelay (10); + CB_CF_REG0 = 0x0003; /* power on */ + mdelay (10); + CB_CF_REG0 = 0x0001; /* reset off */ + mdelay (10); +} + +static void cf_power_off (void) +{ + CB_CF_REG0 = 0x0003; /* power on */ + mdelay (10); + CB_CF_REG0 = 0x0002; /* reest on */ + mdelay (10); +} + +void __init mach_early_init (void) +{ + install_interrupt_vectors (); + + /* CS1 SDRAM instruction cache enable */ + v850e_cache_enable (0x04, 0x03, 0); + + rte_cb_early_init (); + + /* CompactFlash power on */ + cf_power_on (); + +#if defined (CONFIG_ROM_KERNEL) + rom_kernel_init (); +#endif +} + + +/* RTE-V850E/ME2-CB Programmable Interrupt Controller. */ + +static struct cb_pic_irq_init cb_pic_irq_inits[] = { + { "CB_EXTTM0", IRQ_CB_EXTTM0, 1, 1, 6 }, + { "CB_EXTSIO", IRQ_CB_EXTSIO, 1, 1, 6 }, + { "CB_TOVER", IRQ_CB_TOVER, 1, 1, 6 }, + { "CB_GINT0", IRQ_CB_GINT0, 1, 1, 6 }, + { "CB_USB", IRQ_CB_USB, 1, 1, 6 }, + { "CB_LANC", IRQ_CB_LANC, 1, 1, 6 }, + { "CB_USB_VBUS_ON", IRQ_CB_USB_VBUS_ON, 1, 1, 6 }, + { "CB_USB_VBUS_OFF", IRQ_CB_USB_VBUS_OFF, 1, 1, 6 }, + { "CB_EXTTM1", IRQ_CB_EXTTM1, 1, 1, 6 }, + { "CB_EXTTM2", IRQ_CB_EXTTM2, 1, 1, 6 }, + { 0 } +}; +#define NUM_CB_PIC_IRQ_INITS \ + ((sizeof cb_pic_irq_inits / sizeof cb_pic_irq_inits[0]) - 1) + +static struct hw_interrupt_type cb_pic_hw_itypes[NUM_CB_PIC_IRQ_INITS]; +static unsigned char cb_pic_active_irqs = 0; + +void __init rte_me2_cb_init_irqs (void) +{ + cb_pic_init_irq_types (cb_pic_irq_inits, cb_pic_hw_itypes); + + /* Initalize on board PIC1 (not PIC0) enable */ + CB_PIC_INT0M = 0x0000; + CB_PIC_INT1M = 0x0000; + CB_PIC_INTR = 0x0000; + CB_PIC_INTEN |= CB_PIC_INT1EN; + + ME2_PORT2_PMC |= 0x08; /* INTP23/SCK1 mode */ + ME2_PORT2_PFC &= ~0x08; /* INTP23 mode */ + ME2_INTR(2) &= ~0x08; /* INTP23 falling-edge detect */ + ME2_INTF(2) &= ~0x08; /* " */ + + rte_cb_init_irqs (); /* gbus &c */ +} + + +/* Enable interrupt handling for interrupt IRQ. */ +void cb_pic_enable_irq (unsigned irq) +{ + CB_PIC_INT1M |= 1 << (irq - CB_PIC_BASE_IRQ); +} + +void cb_pic_disable_irq (unsigned irq) +{ + CB_PIC_INT1M &= ~(1 << (irq - CB_PIC_BASE_IRQ)); +} + +void cb_pic_shutdown_irq (unsigned irq) +{ + cb_pic_disable_irq (irq); + + if (--cb_pic_active_irqs == 0) + free_irq (IRQ_CB_PIC, 0); + + CB_PIC_INT1M &= ~(1 << (irq - CB_PIC_BASE_IRQ)); +} + +static irqreturn_t cb_pic_handle_irq (int irq, void *dev_id, + struct pt_regs *regs) +{ + irqreturn_t rval = IRQ_NONE; + unsigned status = CB_PIC_INTR; + unsigned enable = CB_PIC_INT1M; + + /* Only pay attention to enabled interrupts. */ + status &= enable; + + CB_PIC_INTEN &= ~CB_PIC_INT1EN; + + if (status) { + unsigned mask = 1; + + irq = CB_PIC_BASE_IRQ; + do { + /* There's an active interrupt, find out which one, + and call its handler. */ + while (! (status & mask)) { + irq++; + mask <<= 1; + } + status &= ~mask; + + CB_PIC_INTR = mask; + + /* Recursively call handle_irq to handle it. */ + handle_irq (irq, regs); + rval = IRQ_HANDLED; + } while (status); + } + + CB_PIC_INTEN |= CB_PIC_INT1EN; + + return rval; +} + + +static void irq_nop (unsigned irq) { } + +static unsigned cb_pic_startup_irq (unsigned irq) +{ + int rval; + + if (cb_pic_active_irqs == 0) { + rval = request_irq (IRQ_CB_PIC, cb_pic_handle_irq, + SA_INTERRUPT, "cb_pic_handler", 0); + if (rval != 0) + return rval; + } + + cb_pic_active_irqs++; + + cb_pic_enable_irq (irq); + + return 0; +} + +/* Initialize HW_IRQ_TYPES for INTC-controlled irqs described in array + INITS (which is terminated by an entry with the name field == 0). */ +void __init cb_pic_init_irq_types (struct cb_pic_irq_init *inits, + struct hw_interrupt_type *hw_irq_types) +{ + struct cb_pic_irq_init *init; + for (init = inits; init->name; init++) { + struct hw_interrupt_type *hwit = hw_irq_types++; + + hwit->typename = init->name; + + hwit->startup = cb_pic_startup_irq; + hwit->shutdown = cb_pic_shutdown_irq; + hwit->enable = cb_pic_enable_irq; + hwit->disable = cb_pic_disable_irq; + hwit->ack = irq_nop; + hwit->end = irq_nop; + + /* Initialize kernel IRQ infrastructure for this interrupt. */ + init_irq_handlers(init->base, init->num, init->interval, hwit); + } +} diff --git a/arch/v850/kernel/rte_me2_cb.ld b/arch/v850/kernel/rte_me2_cb.ld new file mode 100644 index 00000000000..cf0766065ec --- /dev/null +++ b/arch/v850/kernel/rte_me2_cb.ld @@ -0,0 +1,30 @@ +/* Linker script for the Midas labs RTE-V850E/ME2-CB evaluation board + (CONFIG_RTE_CB_ME2), with kernel in SDRAM. */ + +MEMORY { + /* 128Kbyte of IRAM */ + IRAM : ORIGIN = 0x00000000, LENGTH = 0x00020000 + + /* 32MB of SDRAM. */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +#define KRAM SDRAM + +SECTIONS { + .text : { + __kram_start = . ; + TEXT_CONTENTS + INTV_CONTENTS /* copy to iRAM (0x0-0x620) */ + } > KRAM + + .data : { + DATA_CONTENTS + BSS_CONTENTS + RAMK_INIT_CONTENTS + __kram_end = . ; + BOOTMAP_CONTENTS + } > KRAM + + .root ALIGN (4096) : { ROOT_FS_CONTENTS } > SDRAM +} diff --git a/arch/v850/kernel/rte_nb85e_cb-multi.ld b/arch/v850/kernel/rte_nb85e_cb-multi.ld new file mode 100644 index 00000000000..de347b4fffa --- /dev/null +++ b/arch/v850/kernel/rte_nb85e_cb-multi.ld @@ -0,0 +1,57 @@ +/* Linker script for the Midas labs RTE-NB85E-CB evaluation board + (CONFIG_RTE_CB_NB85E), with the Multi debugger ROM monitor . */ + +MEMORY { + /* 1MB of SRAM; we can't use the last 96KB, because it's used by + the monitor scratch-RAM. This memory is mirrored 4 times. */ + SRAM : ORIGIN = SRAM_ADDR, LENGTH = (SRAM_SIZE - MON_SCRATCH_SIZE) + /* Monitor scratch RAM; only the interrupt vectors should go here. */ + MRAM : ORIGIN = MON_SCRATCH_ADDR, LENGTH = MON_SCRATCH_SIZE + /* 16MB of SDRAM. */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +#ifdef CONFIG_RTE_CB_NB85E_KSRAM +# define KRAM SRAM +#else +# define KRAM SDRAM +#endif + +SECTIONS { + /* We can't use RAMK_KRAM_CONTENTS because that puts the whole + kernel in a single ELF segment, and the Multi debugger (which + we use to load the kernel) appears to have bizarre problems + dealing with it. */ + + .text : { + __kram_start = . ; + TEXT_CONTENTS + } > KRAM + + .data : { + DATA_CONTENTS + BSS_CONTENTS + RAMK_INIT_CONTENTS + __kram_end = . ; + BOOTMAP_CONTENTS + + /* The address at which the interrupt vectors are initially + loaded by the loader. We can't load the interrupt vectors + directly into their target location, because the monitor + ROM for the GHS Multi debugger barfs if we try. + Unfortunately, Multi also doesn't deal correctly with ELF + sections where the LMA and VMA differ (it just ignores the + LMA), so we can't use that feature to work around the + problem! What we do instead is just put the interrupt + vectors into a normal section, and have the + `mach_early_init' function for Midas boards do the + necessary copying and relocation at runtime (this section + basically only contains `jr' instructions, so it's not + that hard). */ + . = ALIGN (0x10) ; + __intv_load_start = . ; + INTV_CONTENTS + } > KRAM + + .root ALIGN (4096) : { ROOT_FS_CONTENTS } > SDRAM +} diff --git a/arch/v850/kernel/rte_nb85e_cb.c b/arch/v850/kernel/rte_nb85e_cb.c new file mode 100644 index 00000000000..990b20bffe4 --- /dev/null +++ b/arch/v850/kernel/rte_nb85e_cb.c @@ -0,0 +1,82 @@ +/* + * arch/v850/kernel/rte_nb85e_cb.c -- Midas labs RTE-V850E/NB85E-CB board + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/bootmem.h> +#include <linux/irq.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/v850e.h> +#include <asm/rte_nb85e_cb.h> + +#include "mach.h" + +void __init mach_early_init (void) +{ + /* Configure caching; some possible settings: + + BHC = 0x0000, DCC = 0x0000 -- all caching disabled + BHC = 0x0040, DCC = 0x0000 -- SDRAM: icache only + BHC = 0x0080, DCC = 0x0C00 -- SDRAM: write-back dcache only + BHC = 0x00C0, DCC = 0x0C00 -- SDRAM: icache + write-back dcache + BHC = 0x00C0, DCC = 0x0800 -- SDRAM: icache + write-thru dcache + + We can only cache SDRAM (we can't use cache SRAM because it's in + the same memory region as the on-chip RAM and I/O space). + + Unfortunately, the dcache seems to be buggy, so we only use the + icache for now. */ + v850e_cache_enable (0x0040 /*BHC*/, 0x0003 /*ICC*/, 0x0000 /*DCC*/); + + rte_cb_early_init (); +} + +void __init mach_get_physical_ram (unsigned long *ram_start, + unsigned long *ram_len) +{ + /* We just use SDRAM here. */ + *ram_start = SDRAM_ADDR; + *ram_len = SDRAM_SIZE; +} + +void mach_gettimeofday (struct timespec *tv) +{ + tv->tv_sec = 0; + tv->tv_nsec = 0; +} + +/* Called before configuring an on-chip UART. */ +void rte_nb85e_cb_uart_pre_configure (unsigned chan, + unsigned cflags, unsigned baud) +{ + /* The RTE-NB85E-CB connects some general-purpose I/O pins on the + CPU to the RTS/CTS lines the UART's serial connection, as follows: + P00 = CTS (in), P01 = DSR (in), P02 = RTS (out), P03 = DTR (out). */ + + TEG_PORT0_PM = 0x03; /* P00 and P01 inputs, P02 and P03 outputs */ + TEG_PORT0_IO = 0x03; /* Accept input */ + + /* Do pre-configuration for the actual UART. */ + teg_uart_pre_configure (chan, cflags, baud); +} + +void __init mach_init_irqs (void) +{ + teg_init_irqs (); + rte_cb_init_irqs (); +} diff --git a/arch/v850/kernel/rte_nb85e_cb.ld b/arch/v850/kernel/rte_nb85e_cb.ld new file mode 100644 index 00000000000..b672f484f08 --- /dev/null +++ b/arch/v850/kernel/rte_nb85e_cb.ld @@ -0,0 +1,22 @@ +/* Linker script for the Midas labs RTE-NB85E-CB evaluation board + (CONFIG_RTE_CB_NB85E). */ + +MEMORY { + LOW : ORIGIN = 0x0, LENGTH = 0x00100000 + /* 1MB of SRAM This memory is mirrored 4 times. */ + SRAM : ORIGIN = SRAM_ADDR, LENGTH = SRAM_SIZE + /* 16MB of SDRAM. */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +#ifdef CONFIG_RTE_CB_NB85E_KSRAM +# define KRAM SRAM +#else +# define KRAM SDRAM +#endif + +SECTIONS { + .intv : { INTV_CONTENTS } > LOW + .sram : { RAMK_KRAM_CONTENTS } > KRAM + .root : { ROOT_FS_CONTENTS } > SDRAM +} diff --git a/arch/v850/kernel/semaphore.c b/arch/v850/kernel/semaphore.c new file mode 100644 index 00000000000..fc89fd661c9 --- /dev/null +++ b/arch/v850/kernel/semaphore.c @@ -0,0 +1,166 @@ +/* + * arch/v850/kernel/semaphore.c -- Semaphore support + * + * Copyright (C) 1998-2000 IBM Corporation + * Copyright (C) 1999 Linus Torvalds + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * This file is a copy of the s390 version, arch/s390/kernel/semaphore.c + * Author(s): Martin Schwidefsky + * which was derived from the i386 version, linux/arch/i386/kernel/semaphore.c + */ + +#include <linux/errno.h> +#include <linux/sched.h> +#include <linux/init.h> + +#include <asm/semaphore.h> + +/* + * Semaphores are implemented using a two-way counter: + * The "count" variable is decremented for each process + * that tries to acquire the semaphore, while the "sleeping" + * variable is a count of such acquires. + * + * Notably, the inline "up()" and "down()" functions can + * efficiently test if they need to do any extra work (up + * needs to do something only if count was negative before + * the increment operation. + * + * "sleeping" and the contention routine ordering is + * protected by the semaphore spinlock. + * + * Note that these functions are only called when there is + * contention on the lock, and as such all this is the + * "non-critical" part of the whole semaphore business. The + * critical part is the inline stuff in <asm/semaphore.h> + * where we want to avoid any extra jumps and calls. + */ + +/* + * Logic: + * - only on a boundary condition do we need to care. When we go + * from a negative count to a non-negative, we wake people up. + * - when we go from a non-negative count to a negative do we + * (a) synchronize with the "sleeper" count and (b) make sure + * that we're on the wakeup list before we synchronize so that + * we cannot lose wakeup events. + */ + +void __up(struct semaphore *sem) +{ + wake_up(&sem->wait); +} + +static DEFINE_SPINLOCK(semaphore_lock); + +void __sched __down(struct semaphore * sem) +{ + struct task_struct *tsk = current; + DECLARE_WAITQUEUE(wait, tsk); + tsk->state = TASK_UNINTERRUPTIBLE; + add_wait_queue_exclusive(&sem->wait, &wait); + + spin_lock_irq(&semaphore_lock); + sem->sleepers++; + for (;;) { + int sleepers = sem->sleepers; + + /* + * Add "everybody else" into it. They aren't + * playing, because we own the spinlock. + */ + if (!atomic_add_negative(sleepers - 1, &sem->count)) { + sem->sleepers = 0; + break; + } + sem->sleepers = 1; /* us - see -1 above */ + spin_unlock_irq(&semaphore_lock); + + schedule(); + tsk->state = TASK_UNINTERRUPTIBLE; + spin_lock_irq(&semaphore_lock); + } + spin_unlock_irq(&semaphore_lock); + remove_wait_queue(&sem->wait, &wait); + tsk->state = TASK_RUNNING; + wake_up(&sem->wait); +} + +int __sched __down_interruptible(struct semaphore * sem) +{ + int retval = 0; + struct task_struct *tsk = current; + DECLARE_WAITQUEUE(wait, tsk); + tsk->state = TASK_INTERRUPTIBLE; + add_wait_queue_exclusive(&sem->wait, &wait); + + spin_lock_irq(&semaphore_lock); + sem->sleepers ++; + for (;;) { + int sleepers = sem->sleepers; + + /* + * With signals pending, this turns into + * the trylock failure case - we won't be + * sleeping, and we* can't get the lock as + * it has contention. Just correct the count + * and exit. + */ + if (signal_pending(current)) { + retval = -EINTR; + sem->sleepers = 0; + atomic_add(sleepers, &sem->count); + break; + } + + /* + * Add "everybody else" into it. They aren't + * playing, because we own the spinlock. The + * "-1" is because we're still hoping to get + * the lock. + */ + if (!atomic_add_negative(sleepers - 1, &sem->count)) { + sem->sleepers = 0; + break; + } + sem->sleepers = 1; /* us - see -1 above */ + spin_unlock_irq(&semaphore_lock); + + schedule(); + tsk->state = TASK_INTERRUPTIBLE; + spin_lock_irq(&semaphore_lock); + } + spin_unlock_irq(&semaphore_lock); + tsk->state = TASK_RUNNING; + remove_wait_queue(&sem->wait, &wait); + wake_up(&sem->wait); + return retval; +} + +/* + * Trylock failed - make sure we correct for + * having decremented the count. + */ +int __down_trylock(struct semaphore * sem) +{ + unsigned long flags; + int sleepers; + + spin_lock_irqsave(&semaphore_lock, flags); + sleepers = sem->sleepers + 1; + sem->sleepers = 0; + + /* + * Add "everybody else" and us into it. They aren't + * playing, because we own the spinlock. + */ + if (!atomic_add_negative(sleepers, &sem->count)) + wake_up(&sem->wait); + + spin_unlock_irqrestore(&semaphore_lock, flags); + return 1; +} diff --git a/arch/v850/kernel/setup.c b/arch/v850/kernel/setup.c new file mode 100644 index 00000000000..c41d72b01b8 --- /dev/null +++ b/arch/v850/kernel/setup.c @@ -0,0 +1,286 @@ +/* + * arch/v850/kernel/setup.c -- Arch-dependent initialization functions + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/mm.h> +#include <linux/bootmem.h> +#include <linux/swap.h> /* we don't have swap, but for nr_free_pages */ +#include <linux/irq.h> +#include <linux/reboot.h> +#include <linux/personality.h> +#include <linux/major.h> +#include <linux/root_dev.h> +#include <linux/mtd/mtd.h> +#include <linux/init.h> + +#include <asm/irq.h> +#include <asm/setup.h> + +#include "mach.h" + +/* These symbols are all defined in the linker map to delineate various + statically allocated regions of memory. */ + +extern char _intv_start, _intv_end; +/* `kram' is only used if the kernel uses part of normal user RAM. */ +extern char _kram_start __attribute__ ((__weak__)); +extern char _kram_end __attribute__ ((__weak__)); +extern char _init_start, _init_end; +extern char _bootmap; +extern char _stext, _etext, _sdata, _edata, _sbss, _ebss; +/* Many platforms use an embedded root image. */ +extern char _root_fs_image_start __attribute__ ((__weak__)); +extern char _root_fs_image_end __attribute__ ((__weak__)); + + +char command_line[COMMAND_LINE_SIZE]; + +/* Memory not used by the kernel. */ +static unsigned long total_ram_pages; + +/* System RAM. */ +static unsigned long ram_start = 0, ram_len = 0; + + +#define ADDR_TO_PAGE_UP(x) ((((unsigned long)x) + PAGE_SIZE-1) >> PAGE_SHIFT) +#define ADDR_TO_PAGE(x) (((unsigned long)x) >> PAGE_SHIFT) +#define PAGE_TO_ADDR(x) (((unsigned long)x) << PAGE_SHIFT) + +static void init_mem_alloc (unsigned long ram_start, unsigned long ram_len); + +void set_mem_root (void *addr, size_t len, char *cmd_line); + + +void __init setup_arch (char **cmdline) +{ + /* Keep a copy of command line */ + *cmdline = command_line; + memcpy (saved_command_line, command_line, COMMAND_LINE_SIZE); + saved_command_line[COMMAND_LINE_SIZE - 1] = '\0'; + + console_verbose (); + + init_mm.start_code = (unsigned long) &_stext; + init_mm.end_code = (unsigned long) &_etext; + init_mm.end_data = (unsigned long) &_edata; + init_mm.brk = (unsigned long) &_kram_end; + + /* Find out what mem this machine has. */ + mach_get_physical_ram (&ram_start, &ram_len); + /* ... and tell the kernel about it. */ + init_mem_alloc (ram_start, ram_len); + + printk (KERN_INFO "CPU: %s\nPlatform: %s\n", + CPU_MODEL_LONG, PLATFORM_LONG); + + /* do machine-specific setups. */ + mach_setup (cmdline); + +#ifdef CONFIG_MTD + if (!ROOT_DEV && &_root_fs_image_end > &_root_fs_image_start) + set_mem_root (&_root_fs_image_start, + &_root_fs_image_end - &_root_fs_image_start, + *cmdline); +#endif +} + +void __init trap_init (void) +{ +} + +#ifdef CONFIG_MTD +/* Set the root filesystem to be the given memory region. + Some parameter may be appended to CMD_LINE. */ +void set_mem_root (void *addr, size_t len, char *cmd_line) +{ + /* The only way to pass info to the MTD slram driver is via + the command line. */ + if (*cmd_line) { + cmd_line += strlen (cmd_line); + *cmd_line++ = ' '; + } + sprintf (cmd_line, "slram=root,0x%x,+0x%x", (u32)addr, (u32)len); + + ROOT_DEV = MKDEV (MTD_BLOCK_MAJOR, 0); +} +#endif + + +static void irq_nop (unsigned irq) { } +static unsigned irq_zero (unsigned irq) { return 0; } + +static void nmi_end (unsigned irq) +{ + if (irq != IRQ_NMI (0)) { + printk (KERN_CRIT "NMI %d is unrecoverable; restarting...", + irq - IRQ_NMI (0)); + machine_restart (0); + } +} + +static struct hw_interrupt_type nmi_irq_type = { + "NMI", + irq_zero, /* startup */ + irq_nop, /* shutdown */ + irq_nop, /* enable */ + irq_nop, /* disable */ + irq_nop, /* ack */ + nmi_end, /* end */ +}; + +void __init init_IRQ (void) +{ + init_irq_handlers (0, NUM_MACH_IRQS, 1, 0); + init_irq_handlers (IRQ_NMI (0), NUM_NMIS, 1, &nmi_irq_type); + mach_init_irqs (); +} + + +void __init mem_init (void) +{ + max_mapnr = MAP_NR (ram_start + ram_len); + + num_physpages = ADDR_TO_PAGE (ram_len); + + total_ram_pages = free_all_bootmem (); + + printk (KERN_INFO + "Memory: %luK/%luK available" + " (%luK kernel code, %luK data)\n", + PAGE_TO_ADDR (nr_free_pages()) / 1024, + ram_len / 1024, + ((unsigned long)&_etext - (unsigned long)&_stext) / 1024, + ((unsigned long)&_ebss - (unsigned long)&_sdata) / 1024); +} + +void free_initmem (void) +{ + unsigned long ram_end = ram_start + ram_len; + unsigned long start = PAGE_ALIGN ((unsigned long)(&_init_start)); + + if (start >= ram_start && start < ram_end) { + unsigned long addr; + unsigned long end = PAGE_ALIGN ((unsigned long)(&_init_end)); + + if (end > ram_end) + end = ram_end; + + printk("Freeing unused kernel memory: %ldK freed\n", + (end - start) / 1024); + + for (addr = start; addr < end; addr += PAGE_SIZE) { + struct page *page = virt_to_page (addr); + ClearPageReserved (page); + set_page_count (page, 1); + __free_page (page); + total_ram_pages++; + } + } +} + + +/* Initialize the `bootmem allocator'. RAM_START and RAM_LEN identify + what RAM may be used. */ +static void __init +init_bootmem_alloc (unsigned long ram_start, unsigned long ram_len) +{ + /* The part of the kernel that's in the same managed RAM space + used for general allocation. */ + unsigned long kram_start = (unsigned long)&_kram_start; + unsigned long kram_end = (unsigned long)&_kram_end; + /* End of the managed RAM space. */ + unsigned long ram_end = ram_start + ram_len; + /* Address range of the interrupt vector table. */ + unsigned long intv_start = (unsigned long)&_intv_start; + unsigned long intv_end = (unsigned long)&_intv_end; + /* True if the interrupt vectors are in the managed RAM area. */ + int intv_in_ram = (intv_end > ram_start && intv_start < ram_end); + /* True if the interrupt vectors are inside the kernel's RAM. */ + int intv_in_kram = (intv_end > kram_start && intv_start < kram_end); + /* A pointer to an optional function that reserves platform-specific + memory regions. We declare the pointer `volatile' to avoid gcc + turning the call into a static call (the problem is that since + it's a weak symbol, a static call may end up trying to reference + the location 0x0, which is not always reachable). */ + void (*volatile mrb) (void) = mach_reserve_bootmem; + /* The bootmem allocator's allocation bitmap. */ + unsigned long bootmap = (unsigned long)&_bootmap; + unsigned long bootmap_len; + + /* Round bootmap location up to next page. */ + bootmap = PAGE_TO_ADDR (ADDR_TO_PAGE_UP (bootmap)); + + /* Initialize bootmem allocator. */ + bootmap_len = init_bootmem_node (NODE_DATA (0), + ADDR_TO_PAGE (bootmap), + ADDR_TO_PAGE (PAGE_OFFSET), + ADDR_TO_PAGE (ram_end)); + + /* Now make the RAM actually allocatable (it starts out `reserved'). */ + free_bootmem (ram_start, ram_len); + + if (kram_end > kram_start) + /* Reserve the RAM part of the kernel's address space, so it + doesn't get allocated. */ + reserve_bootmem (kram_start, kram_end - kram_start); + + if (intv_in_ram && !intv_in_kram) + /* Reserve the interrupt vector space. */ + reserve_bootmem (intv_start, intv_end - intv_start); + + if (bootmap >= ram_start && bootmap < ram_end) + /* Reserve the bootmap space. */ + reserve_bootmem (bootmap, bootmap_len); + + /* Reserve the memory used by the root filesystem image if it's + in RAM. */ + if (&_root_fs_image_end > &_root_fs_image_start + && (unsigned long)&_root_fs_image_start >= ram_start + && (unsigned long)&_root_fs_image_start < ram_end) + reserve_bootmem ((unsigned long)&_root_fs_image_start, + &_root_fs_image_end - &_root_fs_image_start); + + /* Let the platform-dependent code reserve some too. */ + if (mrb) + (*mrb) (); +} + +/* Tell the kernel about what RAM it may use for memory allocation. */ +static void __init +init_mem_alloc (unsigned long ram_start, unsigned long ram_len) +{ + unsigned i; + unsigned long zones_size[MAX_NR_ZONES]; + + init_bootmem_alloc (ram_start, ram_len); + + for (i = 0; i < MAX_NR_ZONES; i++) + zones_size[i] = 0; + + /* We stuff all the memory into one area, which includes the + initial gap from PAGE_OFFSET to ram_start. */ + zones_size[ZONE_DMA] + = ADDR_TO_PAGE (ram_len + (ram_start - PAGE_OFFSET)); + + /* The allocator is very picky about the address of the first + allocatable page -- it must be at least as aligned as the + maximum allocation -- so try to detect cases where it will get + confused and signal them at compile time (this is a common + problem when porting to a new platform with ). There is a + similar runtime check in free_area_init_core. */ +#if ((PAGE_OFFSET >> PAGE_SHIFT) & ((1UL << (MAX_ORDER - 1)) - 1)) +#error MAX_ORDER is too large for given PAGE_OFFSET (use CONFIG_FORCE_MAX_ZONEORDER to change it) +#endif + NODE_DATA(0)->node_mem_map = NULL; + free_area_init_node (0, NODE_DATA(0), zones_size, + ADDR_TO_PAGE (PAGE_OFFSET), 0); +} diff --git a/arch/v850/kernel/signal.c b/arch/v850/kernel/signal.c new file mode 100644 index 00000000000..37061e32e1a --- /dev/null +++ b/arch/v850/kernel/signal.c @@ -0,0 +1,525 @@ +/* + * arch/v850/kernel/signal.c -- Signal handling + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * Copyright (C) 1999,2000,2002 Niibe Yutaka & Kaz Kojima + * Copyright (C) 1991,1992 Linus Torvalds + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson + * + * This file was derived from the sh version, arch/sh/kernel/signal.c + */ + +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/kernel.h> +#include <linux/signal.h> +#include <linux/errno.h> +#include <linux/wait.h> +#include <linux/ptrace.h> +#include <linux/unistd.h> +#include <linux/stddef.h> +#include <linux/personality.h> +#include <linux/tty.h> + +#include <asm/ucontext.h> +#include <asm/uaccess.h> +#include <asm/pgtable.h> +#include <asm/pgalloc.h> +#include <asm/thread_info.h> +#include <asm/cacheflush.h> + +#define DEBUG_SIG 0 + +#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) + +asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset); + +/* + * Atomically swap in the new signal mask, and wait for a signal. + */ +asmlinkage int +sys_sigsuspend(old_sigset_t mask, struct pt_regs *regs) +{ + sigset_t saveset; + + mask &= _BLOCKABLE; + spin_lock_irq(¤t->sighand->siglock); + saveset = current->blocked; + siginitset(¤t->blocked, mask); + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + regs->gpr[GPR_RVAL] = -EINTR; + while (1) { + current->state = TASK_INTERRUPTIBLE; + schedule(); + if (do_signal(regs, &saveset)) + return -EINTR; + } +} + +asmlinkage int +sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, + struct pt_regs *regs) +{ + sigset_t saveset, newset; + + /* XXX: Don't preclude handling different sized sigset_t's. */ + if (sigsetsize != sizeof(sigset_t)) + return -EINVAL; + + if (copy_from_user(&newset, unewset, sizeof(newset))) + return -EFAULT; + sigdelsetmask(&newset, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + saveset = current->blocked; + current->blocked = newset; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + regs->gpr[GPR_RVAL] = -EINTR; + while (1) { + current->state = TASK_INTERRUPTIBLE; + schedule(); + if (do_signal(regs, &saveset)) + return -EINTR; + } +} + +asmlinkage int +sys_sigaction(int sig, const struct old_sigaction *act, + struct old_sigaction *oact) +{ + struct k_sigaction new_ka, old_ka; + int ret; + + if (act) { + old_sigset_t mask; + if (!access_ok(VERIFY_READ, act, sizeof(*act)) || + __get_user(new_ka.sa.sa_handler, &act->sa_handler) || + __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) + return -EFAULT; + __get_user(new_ka.sa.sa_flags, &act->sa_flags); + __get_user(mask, &act->sa_mask); + siginitset(&new_ka.sa.sa_mask, mask); + } + + ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); + + if (!ret && oact) { + if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || + __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || + __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) + return -EFAULT; + __put_user(old_ka.sa.sa_flags, &oact->sa_flags); + __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); + } + + return ret; +} + +asmlinkage int +sys_sigaltstack(const stack_t *uss, stack_t *uoss, + struct pt_regs *regs) +{ + return do_sigaltstack(uss, uoss, regs->gpr[GPR_SP]); +} + + +/* + * Do a signal return; undo the signal stack. + */ + +struct sigframe +{ + struct sigcontext sc; + unsigned long extramask[_NSIG_WORDS-1]; + unsigned long tramp[2]; /* signal trampoline */ +}; + +struct rt_sigframe +{ + struct siginfo info; + struct ucontext uc; + unsigned long tramp[2]; /* signal trampoline */ +}; + +static int +restore_sigcontext(struct pt_regs *regs, struct sigcontext *sc, int *rval_p) +{ + unsigned int err = 0; + +#define COPY(x) err |= __get_user(regs->x, &sc->regs.x) + COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]); + COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]); + COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]); + COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]); + COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]); + COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]); + COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]); + COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]); + COPY(pc); COPY(psw); + COPY(ctpc); COPY(ctpsw); COPY(ctbp); +#undef COPY + + return err; +} + +asmlinkage int sys_sigreturn(struct pt_regs *regs) +{ + struct sigframe *frame = (struct sigframe *)regs->gpr[GPR_SP]; + sigset_t set; + int rval; + + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + + if (__get_user(set.sig[0], &frame->sc.oldmask) + || (_NSIG_WORDS > 1 + && __copy_from_user(&set.sig[1], &frame->extramask, + sizeof(frame->extramask)))) + goto badframe; + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + if (restore_sigcontext(regs, &frame->sc, &rval)) + goto badframe; + return rval; + +badframe: + force_sig(SIGSEGV, current); + return 0; +} + +asmlinkage int sys_rt_sigreturn(struct pt_regs *regs) +{ + struct rt_sigframe *frame = (struct rt_sigframe *)regs->gpr[GPR_SP]; + sigset_t set; + stack_t st; + int rval; + + if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) + goto badframe; + + if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) + goto badframe; + + sigdelsetmask(&set, ~_BLOCKABLE); + spin_lock_irq(¤t->sighand->siglock); + current->blocked = set; + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + + if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &rval)) + goto badframe; + + if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) + goto badframe; + /* It is more difficult to avoid calling this function than to + call it and ignore errors. */ + do_sigaltstack(&st, NULL, regs->gpr[GPR_SP]); + + return rval; + +badframe: + force_sig(SIGSEGV, current); + return 0; +} + +/* + * Set up a signal frame. + */ + +static int +setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, + unsigned long mask) +{ + int err = 0; + +#define COPY(x) err |= __put_user(regs->x, &sc->regs.x) + COPY(gpr[0]); COPY(gpr[1]); COPY(gpr[2]); COPY(gpr[3]); + COPY(gpr[4]); COPY(gpr[5]); COPY(gpr[6]); COPY(gpr[7]); + COPY(gpr[8]); COPY(gpr[9]); COPY(gpr[10]); COPY(gpr[11]); + COPY(gpr[12]); COPY(gpr[13]); COPY(gpr[14]); COPY(gpr[15]); + COPY(gpr[16]); COPY(gpr[17]); COPY(gpr[18]); COPY(gpr[19]); + COPY(gpr[20]); COPY(gpr[21]); COPY(gpr[22]); COPY(gpr[23]); + COPY(gpr[24]); COPY(gpr[25]); COPY(gpr[26]); COPY(gpr[27]); + COPY(gpr[28]); COPY(gpr[29]); COPY(gpr[30]); COPY(gpr[31]); + COPY(pc); COPY(psw); + COPY(ctpc); COPY(ctpsw); COPY(ctbp); +#undef COPY + + err |= __put_user(mask, &sc->oldmask); + + return err; +} + +/* + * Determine which stack to use.. + */ +static inline void * +get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) +{ + /* Default to using normal stack */ + unsigned long sp = regs->gpr[GPR_SP]; + + if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! on_sig_stack(sp)) + sp = current->sas_ss_sp + current->sas_ss_size; + + return (void *)((sp - frame_size) & -8UL); +} + +static void setup_frame(int sig, struct k_sigaction *ka, + sigset_t *set, struct pt_regs *regs) +{ + struct sigframe *frame; + int err = 0; + int signal; + + frame = get_sigframe(ka, regs, sizeof(*frame)); + + if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) + goto give_sigsegv; + + signal = current_thread_info()->exec_domain + && current_thread_info()->exec_domain->signal_invmap + && sig < 32 + ? current_thread_info()->exec_domain->signal_invmap[sig] + : sig; + + err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); + + if (_NSIG_WORDS > 1) { + err |= __copy_to_user(frame->extramask, &set->sig[1], + sizeof(frame->extramask)); + } + + /* Set up to return from userspace. If provided, use a stub + already in userspace. */ + if (ka->sa.sa_flags & SA_RESTORER) { + regs->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer; + } else { + /* Note, these encodings are _little endian_! */ + + /* addi __NR_sigreturn, r0, r12 */ + err |= __put_user(0x6600 | (__NR_sigreturn << 16), + frame->tramp + 0); + /* trap 0 */ + err |= __put_user(0x010007e0, + frame->tramp + 1); + + regs->gpr[GPR_LP] = (unsigned long)frame->tramp; + + flush_cache_sigtramp (regs->gpr[GPR_LP]); + } + + if (err) + goto give_sigsegv; + + /* Set up registers for signal handler. */ + regs->pc = (v850_reg_t) ka->sa.sa_handler; + regs->gpr[GPR_SP] = (v850_reg_t)frame; + /* Signal handler args: */ + regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */ + regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->sc;/* arg 1: sigcontext */ + + set_fs(USER_DS); + +#if DEBUG_SIG + printk("SIG deliver (%s:%d): sp=%p pc=%08lx ra=%08lx\n", + current->comm, current->pid, frame, regs->pc, ); +#endif + + return; + +give_sigsegv: + force_sigsegv(sig, current); +} + +static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, + sigset_t *set, struct pt_regs *regs) +{ + struct rt_sigframe *frame; + int err = 0; + int signal; + + frame = get_sigframe(ka, regs, sizeof(*frame)); + + if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) + goto give_sigsegv; + + signal = current_thread_info()->exec_domain + && current_thread_info()->exec_domain->signal_invmap + && sig < 32 + ? current_thread_info()->exec_domain->signal_invmap[sig] + : sig; + + err |= copy_siginfo_to_user(&frame->info, info); + + /* Create the ucontext. */ + err |= __put_user(0, &frame->uc.uc_flags); + err |= __put_user(0, &frame->uc.uc_link); + err |= __put_user((void *)current->sas_ss_sp, + &frame->uc.uc_stack.ss_sp); + err |= __put_user(sas_ss_flags(regs->gpr[GPR_SP]), + &frame->uc.uc_stack.ss_flags); + err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); + err |= setup_sigcontext(&frame->uc.uc_mcontext, + regs, set->sig[0]); + err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); + + /* Set up to return from userspace. If provided, use a stub + already in userspace. */ + if (ka->sa.sa_flags & SA_RESTORER) { + regs->gpr[GPR_LP] = (unsigned long) ka->sa.sa_restorer; + } else { + /* Note, these encodings are _little endian_! */ + + /* addi __NR_sigreturn, r0, r12 */ + err |= __put_user(0x6600 | (__NR_sigreturn << 16), + frame->tramp + 0); + /* trap 0 */ + err |= __put_user(0x010007e0, + frame->tramp + 1); + + regs->gpr[GPR_LP] = (unsigned long)frame->tramp; + + flush_cache_sigtramp (regs->gpr[GPR_LP]); + } + + if (err) + goto give_sigsegv; + + /* Set up registers for signal handler. */ + regs->pc = (v850_reg_t) ka->sa.sa_handler; + regs->gpr[GPR_SP] = (v850_reg_t)frame; + /* Signal handler args: */ + regs->gpr[GPR_ARG0] = signal; /* arg 0: signum */ + regs->gpr[GPR_ARG1] = (v850_reg_t)&frame->info; /* arg 1: siginfo */ + regs->gpr[GPR_ARG2] = (v850_reg_t)&frame->uc; /* arg 2: ucontext */ + + set_fs(USER_DS); + +#if DEBUG_SIG + printk("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", + current->comm, current->pid, frame, regs->pc, regs->pr); +#endif + + return; + +give_sigsegv: + force_sigsegv(sig, current); +} + +/* + * OK, we're invoking a handler + */ + +static void +handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, + sigset_t *oldset, struct pt_regs * regs) +{ + /* Are we from a system call? */ + if (PT_REGS_SYSCALL (regs)) { + /* If so, check system call restarting.. */ + switch (regs->gpr[GPR_RVAL]) { + case -ERESTART_RESTARTBLOCK: + current_thread_info()->restart_block.fn = + do_no_restart_syscall; + /* fall through */ + case -ERESTARTNOHAND: + regs->gpr[GPR_RVAL] = -EINTR; + break; + + case -ERESTARTSYS: + if (!(ka->sa.sa_flags & SA_RESTART)) { + regs->gpr[GPR_RVAL] = -EINTR; + break; + } + /* fallthrough */ + case -ERESTARTNOINTR: + regs->gpr[12] = PT_REGS_SYSCALL (regs); + regs->pc -= 4; /* Size of `trap 0' insn. */ + } + + PT_REGS_SET_SYSCALL (regs, 0); + } + + /* Set up the stack frame */ + if (ka->sa.sa_flags & SA_SIGINFO) + setup_rt_frame(sig, ka, info, oldset, regs); + else + setup_frame(sig, ka, oldset, regs); + + if (!(ka->sa.sa_flags & SA_NODEFER)) { + spin_lock_irq(¤t->sighand->siglock); + sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); + sigaddset(¤t->blocked,sig); + recalc_sigpending(); + spin_unlock_irq(¤t->sighand->siglock); + } +} + +/* + * Note that 'init' is a special process: it doesn't get signals it doesn't + * want to handle. Thus you cannot kill init even with a SIGKILL even by + * mistake. + * + * Note that we go through the signals twice: once to check the signals that + * the kernel can handle, and then we build all the user-level signal handling + * stack-frames in one go after that. + */ +int do_signal(struct pt_regs *regs, sigset_t *oldset) +{ + siginfo_t info; + int signr; + struct k_sigaction ka; + + /* + * We want the common case to go fast, which + * is why we may in certain cases get here from + * kernel mode. Just return without doing anything + * if so. + */ + if (!user_mode(regs)) + return 1; + + if (!oldset) + oldset = ¤t->blocked; + + signr = get_signal_to_deliver(&info, &ka, regs, NULL); + if (signr > 0) { + /* Whee! Actually deliver the signal. */ + handle_signal(signr, &info, &ka, oldset, regs); + return 1; + } + + /* Did we come from a system call? */ + if (PT_REGS_SYSCALL (regs)) { + int rval = (int)regs->gpr[GPR_RVAL]; + /* Restart the system call - no handlers present */ + if (rval == -ERESTARTNOHAND + || rval == -ERESTARTSYS + || rval == -ERESTARTNOINTR) + { + regs->gpr[12] = PT_REGS_SYSCALL (regs); + regs->pc -= 4; /* Size of `trap 0' insn. */ + } + else if (rval == -ERESTART_RESTARTBLOCK) { + regs->gpr[12] = __NR_restart_syscall; + regs->pc -= 4; /* Size of `trap 0' insn. */ + } + } + return 0; +} diff --git a/arch/v850/kernel/sim.c b/arch/v850/kernel/sim.c new file mode 100644 index 00000000000..4f31da96263 --- /dev/null +++ b/arch/v850/kernel/sim.c @@ -0,0 +1,179 @@ +/* + * arch/v850/kernel/sim.c -- Machine-specific stuff for GDB v850e simulator + * + * Copyright (C) 2001,02 NEC Corporation + * Copyright (C) 2001,02 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/bootmem.h> +#include <linux/irq.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/machdep.h> +#include <asm/simsyscall.h> + +#include "mach.h" + +/* The name of a file containing the root filesystem. */ +#define ROOT_FS "rootfs.image" + +extern void simcons_setup (void); +extern void simcons_poll_ttys (void); +extern void set_mem_root (void *addr, size_t len, char *cmd_line); + +static int read_file (const char *name, + unsigned long *addr, unsigned long *len, + const char **err); + +void __init mach_setup (char **cmdline) +{ + const char *err; + unsigned long root_dev_addr, root_dev_len; + + simcons_setup (); + + printk (KERN_INFO "Reading root filesystem: %s", ROOT_FS); + + if (read_file (ROOT_FS, &root_dev_addr, &root_dev_len, &err)) { + printk (" (size %luK)\n", root_dev_len / 1024); + set_mem_root ((void *)root_dev_addr, (size_t)root_dev_len, + *cmdline); + } else + printk ("...%s failed!\n", err); +} + +void mach_get_physical_ram (unsigned long *ram_start, unsigned long *ram_len) +{ + *ram_start = RAM_ADDR; + *ram_len = RAM_SIZE; +} + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* ...do magic timer initialization?... */ + mach_tick = simcons_poll_ttys; + setup_irq (0, timer_action); +} + + +static void irq_nop (unsigned irq) { } +static unsigned irq_zero (unsigned irq) { return 0; } + +static struct hw_interrupt_type sim_irq_type = { + "IRQ", + irq_zero, /* startup */ + irq_nop, /* shutdown */ + irq_nop, /* enable */ + irq_nop, /* disable */ + irq_nop, /* ack */ + irq_nop, /* end */ +}; + +void __init mach_init_irqs (void) +{ + init_irq_handlers (0, NUM_MACH_IRQS, 1, &sim_irq_type); +} + + +void mach_gettimeofday (struct timespec *tv) +{ + long timeval[2], timezone[2]; + int rval = V850_SIM_SYSCALL (gettimeofday, timeval, timezone); + if (rval == 0) { + tv->tv_sec = timeval[0]; + tv->tv_nsec = timeval[1] * 1000; + } +} + +void machine_restart (char *__unused) +{ + V850_SIM_SYSCALL (write, 1, "RESTART\n", 8); + V850_SIM_SYSCALL (exit, 0); +} + +EXPORT_SYMBOL(machine_restart); + +void machine_halt (void) +{ + V850_SIM_SYSCALL (write, 1, "HALT\n", 5); + V850_SIM_SYSCALL (exit, 0); +} + +EXPORT_SYMBOL(machine_halt); + +void machine_power_off (void) +{ + V850_SIM_SYSCALL (write, 1, "POWER OFF\n", 10); + V850_SIM_SYSCALL (exit, 0); +} + +EXPORT_SYMBOL(machine_power_off); + + +/* Load data from a file called NAME into ram. The address and length + of the data image are returned in ADDR and LEN. */ +static int __init +read_file (const char *name, + unsigned long *addr, unsigned long *len, + const char **err) +{ + int rval, fd; + unsigned long cur, left; + /* Note this is not a normal stat buffer, it's an ad-hoc + structure defined by the simulator. */ + unsigned long stat_buf[10]; + + /* Stat the file to find out the length. */ + rval = V850_SIM_SYSCALL (stat, name, stat_buf); + if (rval < 0) { + if (err) *err = "stat"; + return 0; + } + *len = stat_buf[4]; + + /* Open the file; `0' is O_RDONLY. */ + fd = V850_SIM_SYSCALL (open, name, 0); + if (fd < 0) { + if (err) *err = "open"; + return 0; + } + + *addr = (unsigned long)alloc_bootmem(*len); + if (! *addr) { + V850_SIM_SYSCALL (close, fd); + if (err) *err = "alloc_bootmem"; + return 0; + } + + cur = *addr; + left = *len; + while (left > 0) { + int chunk = V850_SIM_SYSCALL (read, fd, cur, left); + if (chunk <= 0) + break; + cur += chunk; + left -= chunk; + } + V850_SIM_SYSCALL (close, fd); + if (left > 0) { + /* Some read failed. */ + free_bootmem (*addr, *len); + if (err) *err = "read"; + return 0; + } + + return 1; +} diff --git a/arch/v850/kernel/sim.ld b/arch/v850/kernel/sim.ld new file mode 100644 index 00000000000..101885f3c9f --- /dev/null +++ b/arch/v850/kernel/sim.ld @@ -0,0 +1,13 @@ +/* Linker script for the gdb v850e simulator (CONFIG_V850E_SIM). */ + +MEMORY { + /* Interrupt vectors. */ + INTV : ORIGIN = 0x0, LENGTH = 0xe0 + /* Main RAM. */ + RAM : ORIGIN = RAM_ADDR, LENGTH = RAM_SIZE +} + +SECTIONS { + .intv : { INTV_CONTENTS } > INTV + .ram : { RAMK_KRAM_CONTENTS } > RAM +} diff --git a/arch/v850/kernel/sim85e2.c b/arch/v850/kernel/sim85e2.c new file mode 100644 index 00000000000..93a722b516b --- /dev/null +++ b/arch/v850/kernel/sim85e2.c @@ -0,0 +1,201 @@ +/* + * arch/v850/kernel/sim85e2.c -- Machine-specific stuff for + * V850E2 RTL simulator + * + * Copyright (C) 2002,03 NEC Electronics Corporation + * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/bootmem.h> +#include <linux/irq.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/machdep.h> + +#include "mach.h" + + +/* There are 4 possible areas we can use: + + IRAM (1MB) is fast for instruction fetches, but slow for data + DRAM (1020KB) is fast for data, but slow for instructions + ERAM is cached, so should be fast for both insns and data + SDRAM is external DRAM, similar to ERAM +*/ + +#define INIT_MEMC_FOR_SDRAM +#define USE_SDRAM_AREA +#define KERNEL_IN_SDRAM_AREA + +#define DCACHE_MODE V850E2_CACHE_BTSC_DCM_WT +/*#define DCACHE_MODE V850E2_CACHE_BTSC_DCM_WB_ALLOC*/ + +#ifdef USE_SDRAM_AREA +#define RAM_START SDRAM_ADDR +#define RAM_END (SDRAM_ADDR + SDRAM_SIZE) +#else +/* When we use DRAM, we need to account for the fact that the end of it is + used for R0_RAM. */ +#define RAM_START DRAM_ADDR +#define RAM_END R0_RAM_ADDR +#endif + + +extern void memcons_setup (void); + + +#ifdef KERNEL_IN_SDRAM_AREA +#define EARLY_INIT_SECTION_ATTR __attribute__ ((section (".early.text"))) +#else +#define EARLY_INIT_SECTION_ATTR __init +#endif + +void EARLY_INIT_SECTION_ATTR mach_early_init (void) +{ + /* The sim85e2 simulator tracks `undefined' values, so to make + debugging easier, we begin by zeroing out all otherwise + undefined registers. This is not strictly necessary. + + The registers we zero are: + Every GPR except: + stack-pointer (r3) + task-pointer (r16) + our return addr (r31) + Every system register (SPR) that we know about except for + the PSW (SPR 5), which we zero except for the + disable-interrupts bit. + */ + + /* GPRs */ + asm volatile (" mov r0, r1 ; mov r0, r2 "); + asm volatile ("mov r0, r4 ; mov r0, r5 ; mov r0, r6 ; mov r0, r7 "); + asm volatile ("mov r0, r8 ; mov r0, r9 ; mov r0, r10; mov r0, r11"); + asm volatile ("mov r0, r12; mov r0, r13; mov r0, r14; mov r0, r15"); + asm volatile (" mov r0, r17; mov r0, r18; mov r0, r19"); + asm volatile ("mov r0, r20; mov r0, r21; mov r0, r22; mov r0, r23"); + asm volatile ("mov r0, r24; mov r0, r25; mov r0, r26; mov r0, r27"); + asm volatile ("mov r0, r28; mov r0, r29; mov r0, r30"); + + /* SPRs */ + asm volatile ("ldsr r0, 0; ldsr r0, 1; ldsr r0, 2; ldsr r0, 3"); + asm volatile ("ldsr r0, 4"); + asm volatile ("addi 0x20, r0, r1; ldsr r1, 5"); /* PSW */ + asm volatile ("ldsr r0, 16; ldsr r0, 17; ldsr r0, 18; ldsr r0, 19"); + asm volatile ("ldsr r0, 20"); + + +#ifdef INIT_MEMC_FOR_SDRAM + /* Settings for SDRAM controller. */ + V850E2_VSWC = 0x0042; + V850E2_BSC = 0x9286; + V850E2_BCT(0) = 0xb000; /* was: 0 */ + V850E2_BCT(1) = 0x000b; + V850E2_ASC = 0; + V850E2_LBS = 0xa9aa; /* was: 0xaaaa */ + V850E2_LBC(0) = 0; + V850E2_LBC(1) = 0; /* was: 0x3 */ + V850E2_BCC = 0; + V850E2_RFS(4) = 0x800a; /* was: 0xf109 */ + V850E2_SCR(4) = 0x2091; /* was: 0x20a1 */ + V850E2_RFS(3) = 0x800c; + V850E2_SCR(3) = 0x20a1; + V850E2_DWC(0) = 0; + V850E2_DWC(1) = 0; +#endif + +#if 0 +#ifdef CONFIG_V850E2_SIM85E2S + /* Turn on the caches. */ + V850E2_CACHE_BTSC = V850E2_CACHE_BTSC_ICM | DCACHE_MODE; + V850E2_BHC = 0x1010; +#elif CONFIG_V850E2_SIM85E2C + V850E2_CACHE_BTSC |= (V850E2_CACHE_BTSC_ICM | V850E2_CACHE_BTSC_DCM0); + V850E2_BUSM_BHC = 0xFFFF; +#endif +#else + V850E2_BHC = 0; +#endif + + /* Don't stop the simulator at `halt' instructions. */ + SIM85E2_NOTHAL = 1; + + /* Ensure that the simulator halts on a panic, instead of going + into an infinite loop inside the panic function. */ + panic_timeout = -1; +} + +void __init mach_setup (char **cmdline) +{ + memcons_setup (); +} + +void mach_get_physical_ram (unsigned long *ram_start, unsigned long *ram_len) +{ + *ram_start = RAM_START; + *ram_len = RAM_END - RAM_START; +} + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* The simulator actually cycles through all interrupts + periodically. We just pay attention to IRQ0, which gives us + 1/64 the rate of the periodic interrupts. */ + setup_irq (0, timer_action); +} + +void mach_gettimeofday (struct timespec *tv) +{ + tv->tv_sec = 0; + tv->tv_nsec = 0; +} + +/* Interrupts */ + +struct v850e_intc_irq_init irq_inits[] = { + { "IRQ", 0, NUM_MACH_IRQS, 1, 7 }, + { 0 } +}; +struct hw_interrupt_type hw_itypes[1]; + +/* Initialize interrupts. */ +void __init mach_init_irqs (void) +{ + v850e_intc_init_irq_types (irq_inits, hw_itypes); +} + + +void machine_halt (void) __attribute__ ((noreturn)); +void machine_halt (void) +{ + SIM85E2_SIMFIN = 0; /* Halt immediately. */ + for (;;) {} +} + +EXPORT_SYMBOL(machine_halt); + +void machine_restart (char *__unused) +{ + machine_halt (); +} + +EXPORT_SYMBOL(machine_restart); + +void machine_power_off (void) +{ + machine_halt (); +} + +EXPORT_SYMBOL(machine_power_off); diff --git a/arch/v850/kernel/sim85e2.ld b/arch/v850/kernel/sim85e2.ld new file mode 100644 index 00000000000..7470fd2ffb5 --- /dev/null +++ b/arch/v850/kernel/sim85e2.ld @@ -0,0 +1,36 @@ +/* Linker script for the sim85e2c simulator, which is a verilog simulation of + the V850E2 NA85E2C cpu core (CONFIG_V850E2_SIM85E2C). */ + +MEMORY { + /* 1MB of `instruction RAM', starting at 0. + Instruction fetches are much faster from IRAM than from DRAM. */ + IRAM : ORIGIN = IRAM_ADDR, LENGTH = IRAM_SIZE + + /* 1MB of `data RAM', below and contiguous with the I/O space. + Data fetches are much faster from DRAM than from IRAM. */ + DRAM : ORIGIN = DRAM_ADDR, LENGTH = DRAM_SIZE + + /* `external ram' (CS1 area), comes after IRAM. */ + ERAM : ORIGIN = ERAM_ADDR, LENGTH = ERAM_SIZE + + /* Dynamic RAM; uses memory controller. */ + SDRAM : ORIGIN = SDRAM_ADDR, LENGTH = SDRAM_SIZE +} + +SECTIONS { + .iram : { + INTV_CONTENTS + *arch/v850/kernel/head.o + *(.early.text) + } > IRAM + .dram : { + _memcons_output = . ; + . = . + 0x8000 ; + _memcons_output_end = . ; + } > DRAM + .sdram : { + /* We stick console output into a buffer here. */ + RAMK_KRAM_CONTENTS + ROOT_FS_CONTENTS + } > SDRAM +} diff --git a/arch/v850/kernel/simcons.c b/arch/v850/kernel/simcons.c new file mode 100644 index 00000000000..7f0efaa025c --- /dev/null +++ b/arch/v850/kernel/simcons.c @@ -0,0 +1,166 @@ +/* + * arch/v850/kernel/simcons.c -- Console I/O for GDB v850e simulator + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/kernel.h> +#include <linux/console.h> +#include <linux/tty.h> +#include <linux/tty_flip.h> +#include <linux/tty_driver.h> +#include <linux/init.h> + +#include <asm/poll.h> +#include <asm/string.h> +#include <asm/simsyscall.h> + + +/* Low-level console. */ + +static void simcons_write (struct console *co, const char *buf, unsigned len) +{ + V850_SIM_SYSCALL (write, 1, buf, len); +} + +static int simcons_read (struct console *co, char *buf, unsigned len) +{ + return V850_SIM_SYSCALL (read, 0, buf, len); +} + +static struct tty_driver *tty_driver; +static struct tty_driver *simcons_device (struct console *c, int *index) +{ + *index = c->index; + return tty_driver; +} + +static struct console simcons = +{ + .name = "simcons", + .write = simcons_write, + .read = simcons_read, + .device = simcons_device, + .flags = CON_PRINTBUFFER, + .index = -1, +}; + +/* Higher level TTY interface. */ + +int simcons_tty_open (struct tty_struct *tty, struct file *filp) +{ + return 0; +} + +int simcons_tty_write (struct tty_struct *tty, + const unsigned char *buf, int count) +{ + return V850_SIM_SYSCALL (write, 1, buf, count); +} + +int simcons_tty_write_room (struct tty_struct *tty) +{ + /* Completely arbitrary. */ + return 0x100000; +} + +int simcons_tty_chars_in_buffer (struct tty_struct *tty) +{ + /* We have no buffer. */ + return 0; +} + +static struct tty_operations ops = { + .open = simcons_tty_open, + .write = simcons_tty_write, + .write_room = simcons_tty_write_room, + .chars_in_buffer = simcons_tty_chars_in_buffer, +}; + +int __init simcons_tty_init (void) +{ + struct tty_driver *driver = alloc_tty_driver(1); + int err; + if (!driver) + return -ENOMEM; + driver->name = "simcons"; + driver->major = TTY_MAJOR; + driver->minor_start = 64; + driver->type = TTY_DRIVER_TYPE_SYSCONS; + driver->init_termios = tty_std_termios; + tty_set_operations(driver, &ops); + err = tty_register_driver(driver); + if (err) { + put_tty_driver(driver); + return err; + } + tty_driver = driver; + return 0; +} +/* We use `late_initcall' instead of just `__initcall' as a workaround for + the fact that (1) simcons_tty_init can't be called before tty_init, + (2) tty_init is called via `module_init', (3) if statically linked, + module_init == device_init, and (4) there's no ordering of init lists. + We can do this easily because simcons is always statically linked, but + other tty drivers that depend on tty_init and which must use + `module_init' to declare their init routines are likely to be broken. */ +late_initcall(simcons_tty_init); + +/* Poll for input on the console, and if there's any, deliver it to the + tty driver. */ +void simcons_poll_tty (struct tty_struct *tty) +{ + int flip = 0, send_break = 0; + struct pollfd pfd; + pfd.fd = 0; + pfd.events = POLLIN; + + if (V850_SIM_SYSCALL (poll, &pfd, 1, 0) > 0) { + if (pfd.revents & POLLIN) { + int left = TTY_FLIPBUF_SIZE - tty->flip.count; + + if (left > 0) { + unsigned char *buf = tty->flip.char_buf_ptr; + int rd = V850_SIM_SYSCALL (read, 0, buf, left); + + if (rd > 0) { + tty->flip.count += rd; + tty->flip.char_buf_ptr += rd; + memset (tty->flip.flag_buf_ptr, 0, rd); + tty->flip.flag_buf_ptr += rd; + flip = 1; + } else + send_break = 1; + } + } else if (pfd.revents & POLLERR) + send_break = 1; + } + + if (send_break) { + tty_insert_flip_char (tty, 0, TTY_BREAK); + flip = 1; + } + + if (flip) + tty_schedule_flip (tty); +} + +void simcons_poll_ttys (void) +{ + if (tty_driver && tty_driver->ttys[0]) + simcons_poll_tty (tty_driver->ttys[0]); +} + +void simcons_setup (void) +{ + V850_SIM_SYSCALL (make_raw, 0); + register_console (&simcons); + printk (KERN_INFO "Console: GDB V850E simulator stdio\n"); +} diff --git a/arch/v850/kernel/syscalls.c b/arch/v850/kernel/syscalls.c new file mode 100644 index 00000000000..9224cb65f6e --- /dev/null +++ b/arch/v850/kernel/syscalls.c @@ -0,0 +1,197 @@ +/* + * arch/v850/kernel/syscalls.c -- Various system-call definitions not + * defined in machine-independent code + * + * Copyright (C) 2001,02 NEC Corporation + * Copyright (C) 2001,02 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * This file was derived the ppc version, arch/ppc/kernel/syscalls.c + * ... which was derived from "arch/i386/kernel/sys_i386.c" by Gary Thomas; + * modified by Cort Dougan (cort@cs.nmt.edu) + * and Paul Mackerras (paulus@cs.anu.edu.au). + */ + +#include <linux/config.h> +#include <linux/errno.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/syscalls.h> +#include <linux/sem.h> +#include <linux/msg.h> +#include <linux/shm.h> +#include <linux/stat.h> +#include <linux/mman.h> +#include <linux/sys.h> +#include <linux/ipc.h> +#include <linux/utsname.h> +#include <linux/file.h> + +#include <asm/uaccess.h> +#include <asm/ipc.h> +#include <asm/semaphore.h> + +/* + * sys_ipc() is the de-multiplexer for the SysV IPC calls.. + * + * This is really horribly ugly. + */ +int +sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth) +{ + int version, ret; + + version = call >> 16; /* hack for backward compatibility */ + call &= 0xffff; + + ret = -EINVAL; + switch (call) { + case SEMOP: + ret = sys_semop (first, (struct sembuf *)ptr, second); + break; + case SEMGET: + ret = sys_semget (first, second, third); + break; + case SEMCTL: + { + union semun fourth; + + if (!ptr) + break; + if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT) + || (ret = get_user(fourth.__pad, (void **)ptr))) + break; + ret = sys_semctl (first, second, third, fourth); + break; + } + case MSGSND: + ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third); + break; + case MSGRCV: + switch (version) { + case 0: { + struct ipc_kludge tmp; + + if (!ptr) + break; + if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT) + || (ret = copy_from_user(&tmp, + (struct ipc_kludge *) ptr, + sizeof (tmp)))) + break; + ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, + third); + break; + } + default: + ret = sys_msgrcv (first, (struct msgbuf *) ptr, + second, fifth, third); + break; + } + break; + case MSGGET: + ret = sys_msgget ((key_t) first, second); + break; + case MSGCTL: + ret = sys_msgctl (first, second, (struct msqid_ds *) ptr); + break; + case SHMAT: + switch (version) { + default: { + ulong raddr; + + if ((ret = access_ok(VERIFY_WRITE, (ulong*) third, + sizeof(ulong)) ? 0 : -EFAULT)) + break; + ret = do_shmat (first, (char *) ptr, second, &raddr); + if (ret) + break; + ret = put_user (raddr, (ulong *) third); + break; + } + case 1: /* iBCS2 emulator entry point */ + if (!segment_eq(get_fs(), get_ds())) + break; + ret = do_shmat (first, (char *) ptr, second, + (ulong *) third); + break; + } + break; + case SHMDT: + ret = sys_shmdt ((char *)ptr); + break; + case SHMGET: + ret = sys_shmget (first, second, third); + break; + case SHMCTL: + ret = sys_shmctl (first, second, (struct shmid_ds *) ptr); + break; + } + + return ret; +} + +/* + * sys_pipe() is the normal C calling standard for creating + * a pipe. It's not the way unix traditionally does this, though. + */ +int sys_pipe (int *fildes) +{ + int fd[2]; + int error; + + error = do_pipe (fd); + if (!error) { + if (copy_to_user (fildes, fd, 2*sizeof (int))) + error = -EFAULT; + } + return error; +} + +static inline unsigned long +do_mmap2 (unsigned long addr, size_t len, + unsigned long prot, unsigned long flags, + unsigned long fd, unsigned long pgoff) +{ + struct file * file = NULL; + int ret = -EBADF; + + flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); + if (! (flags & MAP_ANONYMOUS)) { + if (!(file = fget (fd))) + goto out; + } + + down_write (¤t->mm->mmap_sem); + ret = do_mmap_pgoff (file, addr, len, prot, flags, pgoff); + up_write (¤t->mm->mmap_sem); + if (file) + fput (file); +out: + return ret; +} + +unsigned long sys_mmap2 (unsigned long addr, size_t len, + unsigned long prot, unsigned long flags, + unsigned long fd, unsigned long pgoff) +{ + return do_mmap2 (addr, len, prot, flags, fd, pgoff); +} + +unsigned long sys_mmap (unsigned long addr, size_t len, + unsigned long prot, unsigned long flags, + unsigned long fd, off_t offset) +{ + int err = -EINVAL; + + if (offset & ~PAGE_MASK) + goto out; + + err = do_mmap2 (addr, len, prot, flags, fd, offset >> PAGE_SHIFT); +out: + return err; +} diff --git a/arch/v850/kernel/teg.c b/arch/v850/kernel/teg.c new file mode 100644 index 00000000000..495cf8f37bc --- /dev/null +++ b/arch/v850/kernel/teg.c @@ -0,0 +1,63 @@ +/* + * arch/v850/kernel/teg.c -- NB85E-TEG cpu chip + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/bootmem.h> +#include <linux/irq.h> + +#include <asm/atomic.h> +#include <asm/page.h> +#include <asm/machdep.h> +#include <asm/v850e_timer_d.h> + +#include "mach.h" + +void __init mach_sched_init (struct irqaction *timer_action) +{ + /* Select timer interrupt instead of external pin. */ + TEG_ISS |= 0x1; + /* Start hardware timer. */ + v850e_timer_d_configure (0, HZ); + /* Install timer interrupt handler. */ + setup_irq (IRQ_INTCMD(0), timer_action); +} + +static struct v850e_intc_irq_init irq_inits[] = { + { "IRQ", 0, NUM_CPU_IRQS, 1, 7 }, + { "CMD", IRQ_INTCMD(0), IRQ_INTCMD_NUM, 1, 5 }, + { "SER", IRQ_INTSER(0), IRQ_INTSER_NUM, 1, 3 }, + { "SR", IRQ_INTSR(0), IRQ_INTSR_NUM, 1, 4 }, + { "ST", IRQ_INTST(0), IRQ_INTST_NUM, 1, 5 }, + { 0 } +}; +#define NUM_IRQ_INITS ((sizeof irq_inits / sizeof irq_inits[0]) - 1) + +static struct hw_interrupt_type hw_itypes[NUM_IRQ_INITS]; + +/* Initialize MA chip interrupts. */ +void __init teg_init_irqs (void) +{ + v850e_intc_init_irq_types (irq_inits, hw_itypes); +} + +/* Called before configuring an on-chip UART. */ +void teg_uart_pre_configure (unsigned chan, unsigned cflags, unsigned baud) +{ + /* Enable UART I/O pins instead of external interrupt pins, and + UART interrupts instead of external pin interrupts. */ + TEG_ISS |= 0x4E; +} diff --git a/arch/v850/kernel/time.c b/arch/v850/kernel/time.c new file mode 100644 index 00000000000..f722a268238 --- /dev/null +++ b/arch/v850/kernel/time.c @@ -0,0 +1,198 @@ +/* + * linux/arch/v850/kernel/time.c -- Arch-dependent timer functions + * + * Copyright (C) 1991, 1992, 1995, 2001, 2002 Linus Torvalds + * + * This file contains the v850-specific time handling details. + * Most of the stuff is located in the machine specific files. + * + * 1997-09-10 Updated NTP code according to technical memorandum Jan '96 + * "A Kernel Model for Precision Timekeeping" by Dave Mills + */ + +#include <linux/config.h> /* CONFIG_HEARTBEAT */ +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/param.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/time.h> +#include <linux/timex.h> +#include <linux/profile.h> + +#include <asm/io.h> + +#include "mach.h" + +u64 jiffies_64 = INITIAL_JIFFIES; + +EXPORT_SYMBOL(jiffies_64); + +#define TICK_SIZE (tick_nsec / 1000) + +/* + * Scheduler clock - returns current time in nanosec units. + */ +unsigned long long sched_clock(void) +{ + return (unsigned long long)jiffies * (1000000000 / HZ); +} + +/* + * timer_interrupt() needs to keep up the real-time clock, + * as well as call the "do_timer()" routine every clocktick + */ +static irqreturn_t timer_interrupt (int irq, void *dummy, struct pt_regs *regs) +{ +#if 0 + /* last time the cmos clock got updated */ + static long last_rtc_update=0; +#endif + + /* may need to kick the hardware timer */ + if (mach_tick) + mach_tick (); + + do_timer (regs); +#ifndef CONFIG_SMP + update_process_times(user_mode(regs)); +#endif + profile_tick(CPU_PROFILING, regs); +#if 0 + /* + * If we have an externally synchronized Linux clock, then update + * CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be + * called as close as possible to 500 ms before the new second starts. + */ + if ((time_status & STA_UNSYNC) == 0 && + xtime.tv_sec > last_rtc_update + 660 && + (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && + (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { + if (set_rtc_mmss (xtime.tv_sec) == 0) + last_rtc_update = xtime.tv_sec; + else + last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */ + } +#ifdef CONFIG_HEARTBEAT + /* use power LED as a heartbeat instead -- much more useful + for debugging -- based on the version for PReP by Cort */ + /* acts like an actual heart beat -- ie thump-thump-pause... */ + if (mach_heartbeat) { + static unsigned cnt = 0, period = 0, dist = 0; + + if (cnt == 0 || cnt == dist) + mach_heartbeat ( 1 ); + else if (cnt == 7 || cnt == dist+7) + mach_heartbeat ( 0 ); + + if (++cnt > period) { + cnt = 0; + /* The hyperbolic function below modifies the heartbeat period + * length in dependency of the current (5min) load. It goes + * through the points f(0)=126, f(1)=86, f(5)=51, + * f(inf)->30. */ + period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30; + dist = period / 4; + } + } +#endif /* CONFIG_HEARTBEAT */ +#endif /* 0 */ + + return IRQ_HANDLED; +} + +/* + * This version of gettimeofday has near microsecond resolution. + */ +void do_gettimeofday (struct timeval *tv) +{ +#if 0 /* DAVIDM later if possible */ + extern volatile unsigned long lost_ticks; + unsigned long lost; +#endif + unsigned long flags; + unsigned long usec, sec; + unsigned long seq; + + do { + seq = read_seqbegin_irqsave(&xtime_lock, flags); + +#if 0 + usec = mach_gettimeoffset ? mach_gettimeoffset () : 0; +#else + usec = 0; +#endif +#if 0 /* DAVIDM later if possible */ + lost = lost_ticks; + if (lost) + usec += lost * (1000000/HZ); +#endif + sec = xtime.tv_sec; + usec += xtime.tv_nsec / 1000; + } while (read_seqretry_irqrestore(&xtime_lock, seq, flags)); + + while (usec >= 1000000) { + usec -= 1000000; + sec++; + } + + tv->tv_sec = sec; + tv->tv_usec = usec; +} + +EXPORT_SYMBOL(do_gettimeofday); + +int do_settimeofday(struct timespec *tv) +{ + if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC) + return -EINVAL; + + write_seqlock_irq (&xtime_lock); + + /* This is revolting. We need to set the xtime.tv_nsec + * correctly. However, the value in this location is + * is value at the last tick. + * Discover what correction gettimeofday + * would have done, and then undo it! + */ +#if 0 + tv->tv_nsec -= mach_gettimeoffset() * 1000; +#endif + + while (tv->tv_nsec < 0) { + tv->tv_nsec += NSEC_PER_SEC; + tv->tv_sec--; + } + + xtime.tv_sec = tv->tv_sec; + xtime.tv_nsec = tv->tv_nsec; + + time_adjust = 0; /* stop active adjtime () */ + time_status |= STA_UNSYNC; + time_maxerror = NTP_PHASE_LIMIT; + time_esterror = NTP_PHASE_LIMIT; + + write_sequnlock_irq (&xtime_lock); + clock_was_set(); + return 0; +} + +EXPORT_SYMBOL(do_settimeofday); + +static int timer_dev_id; +static struct irqaction timer_irqaction = { + timer_interrupt, + SA_INTERRUPT, + CPU_MASK_NONE, + "timer", + &timer_dev_id, + NULL +}; + +void time_init (void) +{ + mach_gettimeofday (&xtime); + mach_sched_init (&timer_irqaction); +} diff --git a/arch/v850/kernel/v850_ksyms.c b/arch/v850/kernel/v850_ksyms.c new file mode 100644 index 00000000000..0ca64900dd9 --- /dev/null +++ b/arch/v850/kernel/v850_ksyms.c @@ -0,0 +1,78 @@ +#include <linux/module.h> +#include <linux/linkage.h> +#include <linux/sched.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/user.h> +#include <linux/elfcore.h> +#include <linux/in6.h> +#include <linux/interrupt.h> +#include <linux/config.h> + +#include <asm/pgalloc.h> +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/semaphore.h> +#include <asm/checksum.h> +#include <asm/current.h> + + +extern void *trap_table; +EXPORT_SYMBOL (trap_table); + +/* platform dependent support */ +extern void dump_thread (struct pt_regs *, struct user *); +EXPORT_SYMBOL (dump_thread); +EXPORT_SYMBOL (kernel_thread); +EXPORT_SYMBOL (enable_irq); +EXPORT_SYMBOL (disable_irq); +EXPORT_SYMBOL (disable_irq_nosync); +EXPORT_SYMBOL (__bug); + +/* Networking helper routines. */ +EXPORT_SYMBOL (csum_partial_copy); +EXPORT_SYMBOL (csum_partial_copy_from_user); +EXPORT_SYMBOL (ip_compute_csum); +EXPORT_SYMBOL (ip_fast_csum); + +/* string / mem functions */ +EXPORT_SYMBOL (strcpy); +EXPORT_SYMBOL (strncpy); +EXPORT_SYMBOL (strcat); +EXPORT_SYMBOL (strncat); +EXPORT_SYMBOL (strcmp); +EXPORT_SYMBOL (strncmp); +EXPORT_SYMBOL (strchr); +EXPORT_SYMBOL (strlen); +EXPORT_SYMBOL (strnlen); +EXPORT_SYMBOL (strpbrk); +EXPORT_SYMBOL (strrchr); +EXPORT_SYMBOL (strstr); +EXPORT_SYMBOL (memset); +EXPORT_SYMBOL (memcpy); +EXPORT_SYMBOL (memmove); +EXPORT_SYMBOL (memcmp); +EXPORT_SYMBOL (memscan); + +/* semaphores */ +EXPORT_SYMBOL (__down); +EXPORT_SYMBOL (__down_interruptible); +EXPORT_SYMBOL (__down_trylock); +EXPORT_SYMBOL (__up); + +/* + * libgcc functions - functions that are used internally by the + * compiler... (prototypes are not correct though, but that + * doesn't really matter since they're not versioned). + */ +extern void __ashldi3 (void); +extern void __ashrdi3 (void); +extern void __lshrdi3 (void); +extern void __muldi3 (void); +extern void __negdi2 (void); + +EXPORT_SYMBOL (__ashldi3); +EXPORT_SYMBOL (__ashrdi3); +EXPORT_SYMBOL (__lshrdi3); +EXPORT_SYMBOL (__muldi3); +EXPORT_SYMBOL (__negdi2); diff --git a/arch/v850/kernel/v850e2_cache.c b/arch/v850/kernel/v850e2_cache.c new file mode 100644 index 00000000000..4570312c689 --- /dev/null +++ b/arch/v850/kernel/v850e2_cache.c @@ -0,0 +1,127 @@ +/* + * arch/v850/kernel/v850e2_cache.c -- Cache control for V850E2 cache + * memories + * + * Copyright (C) 2003 NEC Electronics Corporation + * Copyright (C) 2003 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/mm.h> + +#include <asm/v850e2_cache.h> + +/* Cache operations we can do. The encoding corresponds directly to the + value we need to write into the COPR register. */ +enum cache_op { + OP_SYNC_IF_DIRTY = V850E2_CACHE_COPR_CFC(0), /* 000 */ + OP_SYNC_IF_VALID = V850E2_CACHE_COPR_CFC(1), /* 001 */ + OP_SYNC_IF_VALID_AND_CLEAR = V850E2_CACHE_COPR_CFC(3), /* 011 */ + OP_WAY_CLEAR = V850E2_CACHE_COPR_CFC(4), /* 100 */ + OP_FILL = V850E2_CACHE_COPR_CFC(5), /* 101 */ + OP_CLEAR = V850E2_CACHE_COPR_CFC(6), /* 110 */ + OP_CREATE_DIRTY = V850E2_CACHE_COPR_CFC(7) /* 111 */ +}; + +/* Which cache to use. This encoding also corresponds directly to the + value we need to write into the COPR register. */ +enum cache { + ICACHE = 0, + DCACHE = V850E2_CACHE_COPR_LBSL +}; + +/* Returns ADDR rounded down to the beginning of its cache-line. */ +#define CACHE_LINE_ADDR(addr) \ + ((addr) & ~(V850E2_CACHE_LINE_SIZE - 1)) +/* Returns END_ADDR rounded up to the `limit' of its cache-line. */ +#define CACHE_LINE_END_ADDR(end_addr) \ + CACHE_LINE_ADDR(end_addr + (V850E2_CACHE_LINE_SIZE - 1)) + + +/* Low-level cache ops. */ + +/* Apply cache-op OP to all entries in CACHE. */ +static inline void cache_op_all (enum cache_op op, enum cache cache) +{ + int cmd = op | cache | V850E2_CACHE_COPR_WSLE | V850E2_CACHE_COPR_STRT; + + if (op != OP_WAY_CLEAR) { + /* The WAY_CLEAR operation does the whole way, but other + ops take begin-index and count params; we just indicate + the entire cache. */ + V850E2_CACHE_CADL = 0; + V850E2_CACHE_CADH = 0; + V850E2_CACHE_CCNT = V850E2_CACHE_WAY_SIZE - 1; + } + + V850E2_CACHE_COPR = cmd | V850E2_CACHE_COPR_WSL(0); /* way 0 */ + V850E2_CACHE_COPR = cmd | V850E2_CACHE_COPR_WSL(1); /* way 1 */ + V850E2_CACHE_COPR = cmd | V850E2_CACHE_COPR_WSL(2); /* way 2 */ + V850E2_CACHE_COPR = cmd | V850E2_CACHE_COPR_WSL(3); /* way 3 */ +} + +/* Apply cache-op OP to all entries in CACHE covering addresses ADDR + through ADDR+LEN. */ +static inline void cache_op_range (enum cache_op op, u32 addr, u32 len, + enum cache cache) +{ + u32 start = CACHE_LINE_ADDR (addr); + u32 end = CACHE_LINE_END_ADDR (addr + len); + u32 num_lines = (end - start) >> V850E2_CACHE_LINE_SIZE_BITS; + + V850E2_CACHE_CADL = start & 0xFFFF; + V850E2_CACHE_CADH = start >> 16; + V850E2_CACHE_CCNT = num_lines - 1; + + V850E2_CACHE_COPR = op | cache | V850E2_CACHE_COPR_STRT; +} + + +/* High-level ops. */ + +static void cache_exec_after_store_all (void) +{ + cache_op_all (OP_SYNC_IF_DIRTY, DCACHE); + cache_op_all (OP_WAY_CLEAR, ICACHE); +} + +static void cache_exec_after_store_range (u32 start, u32 len) +{ + cache_op_range (OP_SYNC_IF_DIRTY, start, len, DCACHE); + cache_op_range (OP_CLEAR, start, len, ICACHE); +} + + +/* Exported functions. */ + +void flush_icache (void) +{ + cache_exec_after_store_all (); +} + +void flush_icache_range (unsigned long start, unsigned long end) +{ + cache_exec_after_store_range (start, end - start); +} + +void flush_icache_page (struct vm_area_struct *vma, struct page *page) +{ + cache_exec_after_store_range (page_to_virt (page), PAGE_SIZE); +} + +void flush_icache_user_range (struct vm_area_struct *vma, struct page *page, + unsigned long addr, int len) +{ + cache_exec_after_store_range (addr, len); +} + +void flush_cache_sigtramp (unsigned long addr) +{ + /* For the exact size, see signal.c, but 16 bytes should be enough. */ + cache_exec_after_store_range (addr, 16); +} diff --git a/arch/v850/kernel/v850e_cache.c b/arch/v850/kernel/v850e_cache.c new file mode 100644 index 00000000000..ea3e51cfb25 --- /dev/null +++ b/arch/v850/kernel/v850e_cache.c @@ -0,0 +1,174 @@ +/* + * arch/v850/kernel/v850e_cache.c -- Cache control for V850E cache memories + * + * Copyright (C) 2003 NEC Electronics Corporation + * Copyright (C) 2003 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +/* This file implements cache control for the rather simple cache used on + some V850E CPUs, specifically the NB85E/TEG CPU-core and the V850E/ME2 + CPU. V850E2 processors have their own (better) cache + implementation. */ + +#include <asm/entry.h> +#include <asm/cacheflush.h> +#include <asm/v850e_cache.h> + +#define WAIT_UNTIL_CLEAR(value) while (value) {} + +/* Set caching params via the BHC and DCC registers. */ +void v850e_cache_enable (u16 bhc, u16 icc, u16 dcc) +{ + unsigned long *r0_ram = (unsigned long *)R0_RAM_ADDR; + register u16 bhc_val asm ("r6") = bhc; + + /* Read the instruction cache control register (ICC) and confirm + that bits 0 and 1 (TCLR0, TCLR1) are all cleared. */ + WAIT_UNTIL_CLEAR (V850E_CACHE_ICC & 0x3); + V850E_CACHE_ICC = icc; + +#ifdef V850E_CACHE_DCC + /* Configure data-cache. */ + V850E_CACHE_DCC = dcc; +#endif /* V850E_CACHE_DCC */ + + /* Configure caching for various memory regions by writing the BHC + register. The documentation says that an instruction _cannot_ + enable/disable caching for the memory region in which the + instruction itself exists; to work around this, we store + appropriate instructions into the on-chip RAM area (which is never + cached), and briefly jump there to do the work. */ +#ifdef V850E_CACHE_WRITE_IBS + *r0_ram++ = 0xf0720760; /* st.h r0, 0xfffff072[r0] */ +#endif + *r0_ram++ = 0xf06a3760; /* st.h r6, 0xfffff06a[r0] */ + *r0_ram = 0x5640006b; /* jmp [r11] */ + + asm ("mov hilo(1f), r11; jmp [%1]; 1:;" + :: "r" (bhc_val), "r" (R0_RAM_ADDR) : "r11"); +} + +static void clear_icache (void) +{ + /* 1. Read the instruction cache control register (ICC) and confirm + that bits 0 and 1 (TCLR0, TCLR1) are all cleared. */ + WAIT_UNTIL_CLEAR (V850E_CACHE_ICC & 0x3); + + /* 2. Read the ICC register and confirm that bit 12 (LOCK0) is + cleared. Bit 13 of the ICC register is always cleared. */ + WAIT_UNTIL_CLEAR (V850E_CACHE_ICC & 0x1000); + + /* 3. Set the TCLR0 and TCLR1 bits of the ICC register as follows, + when clearing way 0 and way 1 at the same time: + (a) Set the TCLR0 and TCLR1 bits. + (b) Read the TCLR0 and TCLR1 bits to confirm that these bits + are cleared. + (c) Perform (a) and (b) above again. */ + V850E_CACHE_ICC |= 0x3; + WAIT_UNTIL_CLEAR (V850E_CACHE_ICC & 0x3); + +#ifdef V850E_CACHE_REPEAT_ICC_WRITE + /* Do it again. */ + V850E_CACHE_ICC |= 0x3; + WAIT_UNTIL_CLEAR (V850E_CACHE_ICC & 0x3); +#endif +} + +#ifdef V850E_CACHE_DCC +/* Flush or clear (or both) the data cache, depending on the value of FLAGS; + the procedure is the same for both, just the control bits used differ (and + both may be performed simultaneously). */ +static void dcache_op (unsigned short flags) +{ + /* 1. Read the data cache control register (DCC) and confirm that bits + 0, 1, 4, and 5 (DC00, DC01, DC04, DC05) are all cleared. */ + WAIT_UNTIL_CLEAR (V850E_CACHE_DCC & 0x33); + + /* 2. Clear DCC register bit 12 (DC12), bit 13 (DC13), or both + depending on the way for which tags are to be cleared. */ + V850E_CACHE_DCC &= ~0xC000; + + /* 3. Set DCC register bit 0 (DC00), bit 1 (DC01) or both depending on + the way for which tags are to be cleared. + ... + Set DCC register bit 4 (DC04), bit 5 (DC05), or both depending + on the way to be data flushed. */ + V850E_CACHE_DCC |= flags; + + /* 4. Read DCC register bit DC00, DC01 [DC04, DC05], or both depending + on the way for which tags were cleared [flushed] and confirm + that that bit is cleared. */ + WAIT_UNTIL_CLEAR (V850E_CACHE_DCC & flags); +} +#endif /* V850E_CACHE_DCC */ + +/* Flushes the contents of the dcache to memory. */ +static inline void flush_dcache (void) +{ +#ifdef V850E_CACHE_DCC + /* We only need to do something if in write-back mode. */ + if (V850E_CACHE_DCC & 0x0400) + dcache_op (0x30); +#endif /* V850E_CACHE_DCC */ +} + +/* Flushes the contents of the dcache to memory, and then clears it. */ +static inline void clear_dcache (void) +{ +#ifdef V850E_CACHE_DCC + /* We only need to do something if the dcache is enabled. */ + if (V850E_CACHE_DCC & 0x0C00) + dcache_op (0x33); +#endif /* V850E_CACHE_DCC */ +} + +/* Clears the dcache without flushing to memory first. */ +static inline void clear_dcache_no_flush (void) +{ +#ifdef V850E_CACHE_DCC + /* We only need to do something if the dcache is enabled. */ + if (V850E_CACHE_DCC & 0x0C00) + dcache_op (0x3); +#endif /* V850E_CACHE_DCC */ +} + +static inline void cache_exec_after_store (void) +{ + flush_dcache (); + clear_icache (); +} + + +/* Exported functions. */ + +void flush_icache (void) +{ + cache_exec_after_store (); +} + +void flush_icache_range (unsigned long start, unsigned long end) +{ + cache_exec_after_store (); +} + +void flush_icache_page (struct vm_area_struct *vma, struct page *page) +{ + cache_exec_after_store (); +} + +void flush_icache_user_range (struct vm_area_struct *vma, struct page *page, + unsigned long adr, int len) +{ + cache_exec_after_store (); +} + +void flush_cache_sigtramp (unsigned long addr) +{ + cache_exec_after_store (); +} diff --git a/arch/v850/kernel/v850e_intc.c b/arch/v850/kernel/v850e_intc.c new file mode 100644 index 00000000000..8d39a52ee6d --- /dev/null +++ b/arch/v850/kernel/v850e_intc.c @@ -0,0 +1,104 @@ +/* + * arch/v850/kernel/v850e_intc.c -- V850E interrupt controller (INTC) + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/irq.h> + +#include <asm/v850e_intc.h> + +static void irq_nop (unsigned irq) { } + +static unsigned v850e_intc_irq_startup (unsigned irq) +{ + v850e_intc_clear_pending_irq (irq); + v850e_intc_enable_irq (irq); + return 0; +} + +static void v850e_intc_end_irq (unsigned irq) +{ + unsigned long psw, temp; + + /* Clear the highest-level bit in the In-service priority register + (ISPR), to allow this interrupt (or another of the same or + lesser priority) to happen again. + + The `reti' instruction normally does this automatically when the + PSW bits EP and NP are zero, but we can't always rely on reti + being used consistently to return after an interrupt (another + process can be scheduled, for instance, which can delay the + associated reti for a long time, or this process may be being + single-stepped, which uses the `dbret' instruction to return + from the kernel). + + We also set the PSW EP bit, which prevents reti from also + trying to modify the ISPR itself. */ + + /* Get PSW and disable interrupts. */ + asm volatile ("stsr psw, %0; di" : "=r" (psw)); + /* We don't want to do anything for NMIs (they don't use the ISPR). */ + if (! (psw & 0xC0)) { + /* Transition to `trap' state, so that an eventual real + reti instruction won't modify the ISPR. */ + psw |= 0x40; + /* Fake an interrupt return, which automatically clears the + appropriate bit in the ISPR. */ + asm volatile ("mov hilo(1f), %0;" + "ldsr %0, eipc; ldsr %1, eipsw;" + "reti;" + "1:" + : "=&r" (temp) : "r" (psw)); + } +} + +/* Initialize HW_IRQ_TYPES for INTC-controlled irqs described in array + INITS (which is terminated by an entry with the name field == 0). */ +void __init v850e_intc_init_irq_types (struct v850e_intc_irq_init *inits, + struct hw_interrupt_type *hw_irq_types) +{ + struct v850e_intc_irq_init *init; + for (init = inits; init->name; init++) { + unsigned i; + struct hw_interrupt_type *hwit = hw_irq_types++; + + hwit->typename = init->name; + + hwit->startup = v850e_intc_irq_startup; + hwit->shutdown = v850e_intc_disable_irq; + hwit->enable = v850e_intc_enable_irq; + hwit->disable = v850e_intc_disable_irq; + hwit->ack = irq_nop; + hwit->end = v850e_intc_end_irq; + + /* Initialize kernel IRQ infrastructure for this interrupt. */ + init_irq_handlers(init->base, init->num, init->interval, hwit); + + /* Set the interrupt priorities. */ + for (i = 0; i < init->num; i++) { + unsigned irq = init->base + i * init->interval; + + /* If the interrupt is currently enabled (all + interrupts are initially disabled), then + assume whoever enabled it has set things up + properly, and avoid messing with it. */ + if (! v850e_intc_irq_enabled (irq)) + /* This write also (1) disables the + interrupt, and (2) clears any pending + interrupts. */ + V850E_INTC_IC (irq) + = (V850E_INTC_IC_PR (init->priority) + | V850E_INTC_IC_MK); + } + } +} diff --git a/arch/v850/kernel/v850e_timer_d.c b/arch/v850/kernel/v850e_timer_d.c new file mode 100644 index 00000000000..d2a4ece2574 --- /dev/null +++ b/arch/v850/kernel/v850e_timer_d.c @@ -0,0 +1,54 @@ +/* + * include/asm-v850/v850e_timer_d.c -- `Timer D' component often used + * with V850E CPUs + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/kernel.h> + +#include <asm/v850e_utils.h> +#include <asm/v850e_timer_d.h> + +/* Start interval timer TIMER (0-3). The timer will issue the + corresponding INTCMD interrupt RATE times per second. + This function does not enable the interrupt. */ +void v850e_timer_d_configure (unsigned timer, unsigned rate) +{ + unsigned divlog2, count; + + /* Calculate params for timer. */ + if (! calc_counter_params ( + V850E_TIMER_D_BASE_FREQ, rate, + V850E_TIMER_D_TMCD_CS_MIN, V850E_TIMER_D_TMCD_CS_MAX, 16, + &divlog2, &count)) + printk (KERN_WARNING + "Cannot find interval timer %d setting suitable" + " for rate of %dHz.\n" + "Using rate of %dHz instead.\n", + timer, rate, + (V850E_TIMER_D_BASE_FREQ >> divlog2) >> 16); + + /* Do the actual hardware timer initialization: */ + + /* Enable timer. */ + V850E_TIMER_D_TMCD(timer) = V850E_TIMER_D_TMCD_CAE; + /* Set clock divider. */ + V850E_TIMER_D_TMCD(timer) + = V850E_TIMER_D_TMCD_CAE + | V850E_TIMER_D_TMCD_CS(divlog2); + /* Set timer compare register. */ + V850E_TIMER_D_CMD(timer) = count; + /* Start counting. */ + V850E_TIMER_D_TMCD(timer) + = V850E_TIMER_D_TMCD_CAE + | V850E_TIMER_D_TMCD_CS(divlog2) + | V850E_TIMER_D_TMCD_CE; +} diff --git a/arch/v850/kernel/v850e_utils.c b/arch/v850/kernel/v850e_utils.c new file mode 100644 index 00000000000..e6807ef8dee --- /dev/null +++ b/arch/v850/kernel/v850e_utils.c @@ -0,0 +1,62 @@ +/* + * include/asm-v850/v850e_utils.h -- Utility functions associated with + * V850E CPUs + * + * Copyright (C) 2001,02,03 NEC Electronics Corporation + * Copyright (C) 2001,02,03 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <asm/v850e_utils.h> + +/* Calculate counter clock-divider and count values to attain the + desired frequency RATE from the base frequency BASE_FREQ. The + counter is expected to have a clock-divider, which can divide the + system cpu clock by a power of two value from MIN_DIVLOG2 to + MAX_DIV_LOG2, and a word-size of COUNTER_SIZE bits (the counter + counts up and resets whenever it's equal to the compare register, + generating an interrupt or whatever when it does so). The returned + values are: *DIVLOG2 -- log2 of the desired clock divider and *COUNT + -- the counter compare value to use. Returns true if it was possible + to find a reasonable value, otherwise false (and the other return + values will be set to be as good as possible). */ +int calc_counter_params (unsigned long base_freq, + unsigned long rate, + unsigned min_divlog2, unsigned max_divlog2, + unsigned counter_size, + unsigned *divlog2, unsigned *count) +{ + unsigned _divlog2; + int ok = 0; + + /* Find the lowest clock divider setting that can represent RATE. */ + for (_divlog2 = min_divlog2; _divlog2 <= max_divlog2; _divlog2++) { + /* Minimum interrupt rate possible using this divider. */ + unsigned min_int_rate + = (base_freq >> _divlog2) >> counter_size; + + if (min_int_rate <= rate) { + /* This setting is the highest resolution + setting that's slow enough enough to attain + RATE interrupts per second, so use it. */ + ok = 1; + break; + } + } + + if (_divlog2 > max_divlog2) + /* Can't find correct setting. */ + _divlog2 = max_divlog2; + + if (divlog2) + *divlog2 = _divlog2; + if (count) + *count = ((base_freq >> _divlog2) + rate/2) / rate; + + return ok; +} diff --git a/arch/v850/kernel/vmlinux.lds.S b/arch/v850/kernel/vmlinux.lds.S new file mode 100644 index 00000000000..bbd3429bcff --- /dev/null +++ b/arch/v850/kernel/vmlinux.lds.S @@ -0,0 +1,285 @@ +/* + * arch/v850/vmlinux.lds.S -- kernel linker script for v850 platforms + * + * Copyright (C) 2002,03,04 NEC Electronics Corporation + * Copyright (C) 2002,03,04 Miles Bader <miles@gnu.org> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + * Written by Miles Bader <miles@gnu.org> + */ + +#include <linux/config.h> +#define VMLINUX_SYMBOL(_sym_) _##_sym_ +#include <asm-generic/vmlinux.lds.h> + +/* For most platforms, this will define useful things like RAM addr/size. */ +#include <asm/machdep.h> + + +/* The following macros contain the usual definitions for various data areas. + The prefix `RAMK_' is used to indicate macros suitable for kernels loaded + into RAM, and similarly `ROMK_' for ROM-resident kernels. Note that all + symbols are prefixed with an extra `_' for compatibility with the v850 + toolchain. */ + + +/* Interrupt vectors. */ +#define INTV_CONTENTS \ + . = ALIGN (0x10) ; \ + __intv_start = . ; \ + *(.intv.reset) /* Reset vector */ \ + . = __intv_start + 0x10 ; \ + *(.intv.common) /* Vectors common to all v850e proc */\ + . = __intv_start + 0x80 ; \ + *(.intv.mach) /* Machine-specific int. vectors. */ \ + __intv_end = . ; + +#define RODATA_CONTENTS \ + . = ALIGN (16) ; \ + *(.rodata) *(.rodata.*) \ + *(__vermagic) /* Kernel version magic */ \ + *(.rodata1) \ + /* Kernel symbol table: Normal symbols */ \ + ___start___ksymtab = .; \ + *(__ksymtab) \ + ___stop___ksymtab = .; \ + /* Kernel symbol table: GPL-only symbols */ \ + ___start___ksymtab_gpl = .; \ + *(__ksymtab_gpl) \ + ___stop___ksymtab_gpl = .; \ + /* Kernel symbol table: strings */ \ + *(__ksymtab_strings) \ + /* Kernel symbol table: Normal symbols */ \ + ___start___kcrctab = .; \ + *(__kcrctab) \ + ___stop___kcrctab = .; \ + /* Kernel symbol table: GPL-only symbols */ \ + ___start___kcrctab_gpl = .; \ + *(__kcrctab_gpl) \ + ___stop___kcrctab_gpl = .; \ + /* Built-in module parameters */ \ + ___start___param = .; \ + *(__param) \ + ___stop___param = .; + + +/* Kernel text segment, and some constant data areas. */ +#define TEXT_CONTENTS \ + __stext = . ; \ + *(.text) \ + SCHED_TEXT \ + *(.exit.text) /* 2.5 convention */ \ + *(.text.exit) /* 2.4 convention */ \ + *(.text.lock) \ + *(.exitcall.exit) \ + __real_etext = . ; /* There may be data after here. */ \ + RODATA_CONTENTS \ + . = ALIGN (4) ; \ + *(.call_table_data) \ + *(.call_table_text) \ + . = ALIGN (16) ; /* Exception table. */ \ + ___start___ex_table = . ; \ + *(__ex_table) \ + ___stop___ex_table = . ; \ + . = ALIGN (4) ; \ + __etext = . ; + +/* Kernel data segment. */ +#define DATA_CONTENTS \ + __sdata = . ; \ + *(.data) \ + *(.exit.data) /* 2.5 convention */ \ + *(.data.exit) /* 2.4 convention */ \ + . = ALIGN (16) ; \ + *(.data.cacheline_aligned) \ + . = ALIGN (0x2000) ; \ + *(.data.init_task) \ + . = ALIGN (0x2000) ; \ + __edata = . ; + +/* Kernel BSS segment. */ +#define BSS_CONTENTS \ + __sbss = . ; \ + *(.bss) \ + *(COMMON) \ + . = ALIGN (4) ; \ + __init_stack_end = . ; \ + __ebss = . ; + +/* `initcall' tables. */ +#define INITCALL_CONTENTS \ + . = ALIGN (16) ; \ + ___setup_start = . ; \ + *(.init.setup) /* 2.5 convention */ \ + *(.setup.init) /* 2.4 convention */ \ + ___setup_end = . ; \ + ___initcall_start = . ; \ + *(.initcall.init) \ + *(.initcall1.init) \ + *(.initcall2.init) \ + *(.initcall3.init) \ + *(.initcall4.init) \ + *(.initcall5.init) \ + *(.initcall6.init) \ + *(.initcall7.init) \ + . = ALIGN (4) ; \ + ___initcall_end = . ; \ + ___con_initcall_start = .; \ + *(.con_initcall.init) \ + ___con_initcall_end = .; + +/* Contents of `init' section for a kernel that's loaded into RAM. */ +#define RAMK_INIT_CONTENTS \ + RAMK_INIT_CONTENTS_NO_END \ + __init_end = . ; +/* Same as RAMK_INIT_CONTENTS, but doesn't define the `__init_end' symbol. */ +#define RAMK_INIT_CONTENTS_NO_END \ + . = ALIGN (4096) ; \ + __init_start = . ; \ + __sinittext = .; \ + *(.init.text) /* 2.5 convention */ \ + __einittext = .; \ + *(.init.data) \ + *(.text.init) /* 2.4 convention */ \ + *(.data.init) \ + INITCALL_CONTENTS \ + INITRAMFS_CONTENTS + +/* The contents of `init' section for a ROM-resident kernel which + should go into RAM. */ +#define ROMK_INIT_RAM_CONTENTS \ + . = ALIGN (4096) ; \ + __init_start = . ; \ + *(.init.data) /* 2.5 convention */ \ + *(.data.init) /* 2.4 convention */ \ + __init_end = . ; \ + . = ALIGN (4096) ; + +/* The contents of `init' section for a ROM-resident kernel which + should go into ROM. */ +#define ROMK_INIT_ROM_CONTENTS \ + _sinittext = .; \ + *(.init.text) /* 2.5 convention */ \ + _einittext = .; \ + *(.text.init) /* 2.4 convention */ \ + INITCALL_CONTENTS \ + INITRAMFS_CONTENTS + +/* A root filesystem image, for kernels with an embedded root filesystem. */ +#define ROOT_FS_CONTENTS \ + __root_fs_image_start = . ; \ + *(.root) \ + __root_fs_image_end = . ; +/* The initramfs archive. */ +#define INITRAMFS_CONTENTS \ + . = ALIGN (4) ; \ + ___initramfs_start = . ; \ + *(.init.ramfs) \ + ___initramfs_end = . ; +/* Where the initial bootmap (bitmap for the boot-time memory allocator) + should be place. */ +#define BOOTMAP_CONTENTS \ + . = ALIGN (4096) ; \ + __bootmap = . ; \ + . = . + 4096 ; /* enough for 128MB. */ + +/* The contents of a `typical' kram area for a kernel in RAM. */ +#define RAMK_KRAM_CONTENTS \ + __kram_start = . ; \ + TEXT_CONTENTS \ + DATA_CONTENTS \ + BSS_CONTENTS \ + RAMK_INIT_CONTENTS \ + __kram_end = . ; \ + BOOTMAP_CONTENTS + + +/* Define output sections normally used for a ROM-resident kernel. + ROM and RAM should be appropriate memory areas to use for kernel + ROM and RAM data. This assumes that ROM starts at 0 (and thus can + hold the interrupt vectors). */ +#define ROMK_SECTIONS(ROM, RAM) \ + .rom : { \ + INTV_CONTENTS \ + TEXT_CONTENTS \ + ROMK_INIT_ROM_CONTENTS \ + ROOT_FS_CONTENTS \ + } > ROM \ + \ + __rom_copy_src_start = . ; \ + \ + .data : { \ + __kram_start = . ; \ + __rom_copy_dst_start = . ; \ + DATA_CONTENTS \ + ROMK_INIT_RAM_CONTENTS \ + __rom_copy_dst_end = . ; \ + } > RAM AT> ROM \ + \ + .bss ALIGN (4) : { \ + BSS_CONTENTS \ + __kram_end = . ; \ + BOOTMAP_CONTENTS \ + } > RAM + + +/* The 32-bit variable `jiffies' is just the lower 32-bits of `jiffies_64'. */ +_jiffies = _jiffies_64 ; + + +/* Include an appropriate platform-dependent linker-script (which + usually should use the above macros to do most of the work). */ + +#ifdef CONFIG_V850E_SIM +# include "sim.ld" +#endif + +#ifdef CONFIG_V850E2_SIM85E2 +# include "sim85e2.ld" +#endif + +#ifdef CONFIG_V850E2_FPGA85E2C +# include "fpga85e2c.ld" +#endif + +#ifdef CONFIG_V850E2_ANNA +# ifdef CONFIG_ROM_KERNEL +# include "anna-rom.ld" +# else +# include "anna.ld" +# endif +#endif + +#ifdef CONFIG_V850E_AS85EP1 +# ifdef CONFIG_ROM_KERNEL +# include "as85ep1-rom.ld" +# else +# include "as85ep1.ld" +# endif +#endif + +#ifdef CONFIG_RTE_CB_MA1 +# ifdef CONFIG_ROM_KERNEL +# include "rte_ma1_cb-rom.ld" +# else +# include "rte_ma1_cb.ld" +# endif +#endif + +#ifdef CONFIG_RTE_CB_NB85E +# ifdef CONFIG_ROM_KERNEL +# include "rte_nb85e_cb-rom.ld" +# elif defined(CONFIG_RTE_CB_MULTI) +# include "rte_nb85e_cb-multi.ld" +# else +# include "rte_nb85e_cb.ld" +# endif +#endif + +#ifdef CONFIG_RTE_CB_ME2 +# include "rte_me2_cb.ld" +#endif + |