Merge branch 'linux-2.6'

1 files changed, 394 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
new file mode 100644
index 00000000000..3eff7439d8d
--- /dev/null
+++ b/arch/blackfin/kernel/process.c
@@ -0,0 +1,394 @@
+/*
+ * File:         arch/blackfin/kernel/process.c
+ * Based on:
+ * Author:
+ *
+ * Created:
+ * Description:  Blackfin architecture-dependent process handling.
+ *
+ * Modified:
+ *               Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include <linux/smp_lock.h>
+#include <linux/unistd.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+
+#include <asm/blackfin.h>
+#include <asm/uaccess.h>
+
+#define	LED_ON	0
+#define	LED_OFF	1
+
+asmlinkage void ret_from_fork(void);
+
+/* Points to the SDRAM backup memory for the stack that is currently in
+ * L1 scratchpad memory.
+ */
+void *current_l1_stack_save;
+
+/* The number of tasks currently using a L1 stack area.  The SRAM is
+ * allocated/deallocated whenever this changes from/to zero.
+ */
+int nr_l1stack_tasks;
+
+/* Start and length of the area in L1 scratchpad memory which we've allocated
+ * for process stacks.
+ */
+void *l1_stack_base;
+unsigned long l1_stack_len;
+
+/*
+ * Powermanagement idle function, if any..
+ */
+void (*pm_idle)(void) = NULL;
+EXPORT_SYMBOL(pm_idle);
+
+void (*pm_power_off)(void) = NULL;
+EXPORT_SYMBOL(pm_power_off);
+
+/*
+ * We are using a different LED from the one used to indicate timer interrupt.
+ */
+#if defined(CONFIG_BFIN_IDLE_LED)
+static inline void leds_switch(int flag)
+{
+	unsigned short tmp = 0;
+
+	tmp = bfin_read_CONFIG_BFIN_IDLE_LED_PORT();
+	SSYNC();
+
+	if (flag == LED_ON)
+		tmp &= ~CONFIG_BFIN_IDLE_LED_PIN;	/* light on */
+	else
+		tmp |= CONFIG_BFIN_IDLE_LED_PIN;	/* light off */
+
+	bfin_write_CONFIG_BFIN_IDLE_LED_PORT(tmp);
+	SSYNC();
+
+}
+#else
+static inline void leds_switch(int flag)
+{
+}
+#endif
+
+/*
+ * The idle loop on BFIN
+ */
+#ifdef CONFIG_IDLE_L1
+void default_idle(void)__attribute__((l1_text));
+void cpu_idle(void)__attribute__((l1_text));
+#endif
+
+void default_idle(void)
+{
+	while (!need_resched()) {
+		leds_switch(LED_OFF);
+		local_irq_disable();
+		if (likely(!need_resched()))
+			idle_with_irq_disabled();
+		local_irq_enable();
+		leds_switch(LED_ON);
+	}
+}
+
+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 */
+	while (1) {
+		idle();
+		preempt_enable_no_resched();
+		schedule();
+		preempt_disable();
+	}
+}
+
+void machine_restart(char *__unused)
+{
+#if defined(CONFIG_BLKFIN_CACHE)
+	bfin_write_IMEM_CONTROL(0x01);
+	SSYNC();
+#endif
+	bfin_reset();
+	/* Dont do anything till the reset occurs */
+	while (1) {
+		SSYNC();
+	}
+}
+
+void machine_halt(void)
+{
+	for (;;)
+		asm volatile ("idle");
+}
+
+void machine_power_off(void)
+{
+	for (;;)
+		asm volatile ("idle");
+}
+
+void show_regs(struct pt_regs *regs)
+{
+	printk(KERN_NOTICE "\n");
+	printk(KERN_NOTICE
+	       "PC: %08lu  Status: %04lu  SysStatus: %04lu  RETS: %08lu\n",
+	       regs->pc, regs->astat, regs->seqstat, regs->rets);
+	printk(KERN_NOTICE
+	       "A0.x: %08lx  A0.w: %08lx  A1.x: %08lx  A1.w: %08lx\n",
+	       regs->a0x, regs->a0w, regs->a1x, regs->a1w);
+	printk(KERN_NOTICE "P0: %08lx  P1: %08lx  P2: %08lx  P3: %08lx\n",
+	       regs->p0, regs->p1, regs->p2, regs->p3);
+	printk(KERN_NOTICE "P4: %08lx  P5: %08lx\n", regs->p4, regs->p5);
+	printk(KERN_NOTICE "R0: %08lx  R1: %08lx  R2: %08lx  R3: %08lx\n",
+	       regs->r0, regs->r1, regs->r2, regs->r3);
+	printk(KERN_NOTICE "R4: %08lx  R5: %08lx  R6: %08lx  R7: %08lx\n",
+	       regs->r4, regs->r5, regs->r6, regs->r7);
+
+	if (!(regs->ipend))
+		printk("USP: %08lx\n", rdusp());
+}
+
+/* Fill in the fpu structure for a core dump.  */
+
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t * fpregs)
+{
+	return 1;
+}
+
+/*
+ * This gets run with P1 containing the
+ * function to call, and R1 containing
+ * the "args".  Note P0 is clobbered on the way here.
+ */
+void kernel_thread_helper(void);
+__asm__(".section .text\n"
+	".align 4\n"
+	"_kernel_thread_helper:\n\t"
+	"\tsp += -12;\n\t"
+	"\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous");
+
+/*
+ * Create a kernel thread.
+ */
+pid_t kernel_thread(int (*fn) (void *), void *arg, unsigned long flags)
+{
+	struct pt_regs regs;
+
+	memset(&regs, 0, sizeof(regs));
+
+	regs.r1 = (unsigned long)arg;
+	regs.p1 = (unsigned long)fn;
+	regs.pc = (unsigned long)kernel_thread_helper;
+	regs.orig_p0 = -1;
+	/* Set bit 2 to tell ret_from_fork we should be returning to kernel
+	   mode.  */
+	regs.ipend = 0x8002;
+	__asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);
+	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
+		       NULL);
+}
+
+void flush_thread(void)
+{
+}
+
+asmlinkage int bfin_vfork(struct pt_regs *regs)
+{
+	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL,
+		       NULL);
+}
+
+asmlinkage int bfin_clone(struct pt_regs *regs)
+{
+	unsigned long clone_flags;
+	unsigned long newsp;
+
+	/* syscall2 puts clone_flags in r0 and usp in r1 */
+	clone_flags = regs->r0;
+	newsp = regs->r1;
+	if (!newsp)
+		newsp = rdusp();
+	else
+		newsp -= 12;
+	return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
+}
+
+int
+copy_thread(int nr, unsigned long clone_flags,
+	    unsigned long usp, unsigned long topstk,
+	    struct task_struct *p, struct pt_regs *regs)
+{
+	struct pt_regs *childregs;
+
+	childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
+	*childregs = *regs;
+	childregs->r0 = 0;
+
+	p->thread.usp = usp;
+	p->thread.ksp = (unsigned long)childregs;
+	p->thread.pc = (unsigned long)ret_from_fork;
+
+	return 0;
+}
+
+/*
+ * fill in the user structure for a core dump..
+ */
+void dump_thread(struct pt_regs *regs, struct user *dump)
+{
+	dump->magic = CMAGIC;
+	dump->start_code = 0;
+	dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
+	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.r0 = regs->r0;
+	dump->regs.r1 = regs->r1;
+	dump->regs.r2 = regs->r2;
+	dump->regs.r3 = regs->r3;
+	dump->regs.r4 = regs->r4;
+	dump->regs.r5 = regs->r5;
+	dump->regs.r6 = regs->r6;
+	dump->regs.r7 = regs->r7;
+	dump->regs.p0 = regs->p0;
+	dump->regs.p1 = regs->p1;
+	dump->regs.p2 = regs->p2;
+	dump->regs.p3 = regs->p3;
+	dump->regs.p4 = regs->p4;
+	dump->regs.p5 = regs->p5;
+	dump->regs.orig_p0 = regs->orig_p0;
+	dump->regs.a0w = regs->a0w;
+	dump->regs.a1w = regs->a1w;
+	dump->regs.a0x = regs->a0x;
+	dump->regs.a1x = regs->a1x;
+	dump->regs.rets = regs->rets;
+	dump->regs.astat = regs->astat;
+	dump->regs.pc = regs->pc;
+}
+
+/*
+ * sys_execve() executes a new program.
+ */
+
+asmlinkage int sys_execve(char *name, char **argv, char **envp)
+{
+	int error;
+	char *filename;
+	struct pt_regs *regs = (struct pt_regs *)((&name) + 6);
+
+	lock_kernel();
+	filename = getname(name);
+	error = PTR_ERR(filename);
+	if (IS_ERR(filename))
+		goto out;
+	error = do_execve(filename, argv, envp, regs);
+	putname(filename);
+      out:
+	unlock_kernel();
+	return error;
+}
+
+unsigned long get_wchan(struct task_struct *p)
+{
+	unsigned long fp, pc;
+	unsigned long stack_page;
+	int count = 0;
+	if (!p || p == current || p->state == TASK_RUNNING)
+		return 0;
+
+	stack_page = (unsigned long)p;
+	fp = p->thread.usp;
+	do {
+		if (fp < stack_page + sizeof(struct thread_info) ||
+		    fp >= 8184 + stack_page)
+			return 0;
+		pc = ((unsigned long *)fp)[1];
+		if (!in_sched_functions(pc))
+			return pc;
+		fp = *(unsigned long *)fp;
+	}
+	while (count++ < 16);
+	return 0;
+}
+
+#if defined(CONFIG_ACCESS_CHECK)
+int _access_ok(unsigned long addr, unsigned long size)
+{
+
+	if (addr > (addr + size))
+		return 0;
+	if (segment_eq(get_fs(),KERNEL_DS))
+		return 1;
+#ifdef CONFIG_MTD_UCLINUX
+	if (addr >= memory_start && (addr + size) <= memory_end)
+		return 1;
+	if (addr >= memory_mtd_end && (addr + size) <= physical_mem_end)
+		return 1;
+#else
+	if (addr >= memory_start && (addr + size) <= physical_mem_end)
+		return 1;
+#endif
+	if (addr >= (unsigned long)__init_begin &&
+	    addr + size <= (unsigned long)__init_end)
+		return 1;
+	if (addr >= L1_SCRATCH_START
+	    && addr + size <= L1_SCRATCH_START + L1_SCRATCH_LENGTH)
+		return 1;
+#if L1_CODE_LENGTH != 0
+	if (addr >= L1_CODE_START + (_etext_l1 - _stext_l1)
+	    && addr + size <= L1_CODE_START + L1_CODE_LENGTH)
+		return 1;
+#endif
+#if L1_DATA_A_LENGTH != 0
+	if (addr >= L1_DATA_A_START + (_ebss_l1 - _sdata_l1)
+	    && addr + size <= L1_DATA_A_START + L1_DATA_A_LENGTH)
+		return 1;
+#endif
+#if L1_DATA_B_LENGTH != 0
+	if (addr >= L1_DATA_B_START
+	    && addr + size <= L1_DATA_B_START + L1_DATA_B_LENGTH)
+		return 1;
+#endif
+	return 0;
+}
+EXPORT_SYMBOL(_access_ok);
+#endif /* CONFIG_ACCESS_CHECK */