/* * PowerPC version * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu> * Adapted for Power Macintosh by Paul Mackerras. * Low-level exception handlers and MMU support * rewritten by Paul Mackerras. * Copyright (C) 1996 Paul Mackerras. * * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com * * This file contains the low-level support and setup for the * PowerPC-64 platform, including trap and interrupt dispatch. * * 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. */ #include <linux/threads.h> #include <asm/reg.h> #include <asm/page.h> #include <asm/mmu.h> #include <asm/ppc_asm.h> #include <asm/asm-offsets.h> #include <asm/bug.h> #include <asm/cputable.h> #include <asm/setup.h> #include <asm/hvcall.h> #include <asm/iseries/lpar_map.h> #include <asm/thread_info.h> #include <asm/firmware.h> #include <asm/page_64.h> #include <asm/exception.h> #include <asm/irqflags.h> /* * We layout physical memory as follows: * 0x0000 - 0x00ff : Secondary processor spin code * 0x0100 - 0x2fff : pSeries Interrupt prologs * 0x3000 - 0x5fff : interrupt support, iSeries and common interrupt prologs * 0x6000 - 0x6fff : Initial (CPU0) segment table * 0x7000 - 0x7fff : FWNMI data area * 0x8000 - : Early init and support code */ /* * SPRG Usage * * Register Definition * * SPRG0 reserved for hypervisor * SPRG1 temp - used to save gpr * SPRG2 temp - used to save gpr * SPRG3 virt addr of paca */ /* * Entering into this code we make the following assumptions: * For pSeries: * 1. The MMU is off & open firmware is running in real mode. * 2. The kernel is entered at __start * * For iSeries: * 1. The MMU is on (as it always is for iSeries) * 2. The kernel is entered at system_reset_iSeries */ .text .globl _stext _stext: _GLOBAL(__start) /* NOP this out unconditionally */ BEGIN_FTR_SECTION b .__start_initialization_multiplatform END_FTR_SECTION(0, 1) /* Catch branch to 0 in real mode */ trap /* Secondary processors spin on this value until it becomes nonzero. * When it does it contains the real address of the descriptor * of the function that the cpu should jump to to continue * initialization. */ .globl __secondary_hold_spinloop __secondary_hold_spinloop: .llong 0x0 /* Secondary processors write this value with their cpu # */ /* after they enter the spin loop immediately below. */ .globl __secondary_hold_acknowledge __secondary_hold_acknowledge: .llong 0x0 #ifdef CONFIG_PPC_ISERIES /* * At offset 0x20, there is a pointer to iSeries LPAR data. * This is required by the hypervisor */ . = 0x20 .llong hvReleaseData-KERNELBASE #endif /* CONFIG_PPC_ISERIES */ #ifdef CONFIG_CRASH_DUMP /* This flag is set to 1 by a loader if the kernel should run * at the loaded address instead of the linked address. This * is used by kexec-tools to keep the the kdump kernel in the * crash_kernel region. The loader is responsible for * observing the alignment requirement. */ /* Do not move this variable as kexec-tools knows about it. */ . = 0x5c .globl __run_at_load __run_at_load: .long 0x72756e30 /* "run0" -- relocate to 0 by default */ #endif . = 0x60 /* * The following code is used to hold secondary processors * in a spin loop after they have entered the kernel, but * before the bulk of the kernel has been relocated. This code * is relocated to physical address 0x60 before prom_init is run. * All of it must fit below the first exception vector at 0x100. * Use .globl here not _GLOBAL because we want __secondary_hold * to be the actual text address, not a descriptor. */ .globl __secondary_hold __secondary_hold: mfmsr r24 ori r24,r24,MSR_RI mtmsrd r24 /* RI on */ /* Grab our physical cpu number */ mr r24,r3 /* Tell the master cpu we're here */ /* Relocation is off & we are located at an address less */ /* than 0x100, so only need to grab low order offset. */ std r24,__secondary_hold_acknowledge-_stext(0) sync /* All secondary cpus wait here until told to start. */ 100: ld r4,__secondary_hold_spinloop-_stext(0) cmpdi 0,r4,0 beq 100b #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) ld r4,0(r4) /* deref function descriptor */ mtctr r4 mr r3,r24 bctr #else BUG_OPCODE #endif /* This value is used to mark exception frames on the stack. */ .section ".toc","aw" exception_marker: .tc ID_72656773_68657265[TC],0x7265677368657265 .text /* * This is the start of the interrupt handlers for pSeries * This code runs with relocation off. * Code from here to __end_interrupts gets copied down to real * address 0x100 when we are running a relocatable kernel. * Therefore any relative branches in this section must only * branch to labels in this section. */ . = 0x100 .globl __start_interrupts __start_interrupts: STD_EXCEPTION_PSERIES(0x100, system_reset) . = 0x200 _machine_check_pSeries: HMT_MEDIUM mtspr SPRN_SPRG1,r13 /* save r13 */ EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common) . = 0x300 .globl data_access_pSeries data_access_pSeries: HMT_MEDIUM mtspr SPRN_SPRG1,r13 BEGIN_FTR_SECTION mtspr SPRN_SPRG2,r12 mfspr r13,SPRN_DAR mfspr r12,SPRN_DSISR srdi r13,r13,60 rlwimi r13,r12,16,0x20 mfcr r12 cmpwi r13,0x2c beq do_stab_bolted_pSeries mtcrf 0x80,r12 mfspr r12,SPRN_SPRG2 END_FTR_SECTION_IFCLR(CPU_FTR_SLB) EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common) . = 0x380 .globl data_access_slb_pSeries data_access_slb_pSeries: HMT_MEDIUM mtspr SPRN_SPRG1,r13 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */ std r3,PACA_EXSLB+EX_R3(r13) mfspr r3,SPRN_DAR std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */ mfcr r9 #ifdef __DISABLED__ /* Keep that around for when we re-implement dynamic VSIDs */ cmpdi r3,0 bge slb_miss_user_pseries #endif /* __DISABLED__ */ std r10,PACA_EXSLB+EX_R10(r13) std r11,PACA_EXSLB+EX_R11(r13) std r12,PACA_EXSLB+EX_R12(r13) mfspr r10,SPRN_SPRG1 std r10,PACA_EXSLB+EX_R13(r13) mfspr r12,SPRN_SRR1 /* and SRR1 */ #ifndef CONFIG_RELOCATABLE b .slb_miss_realmode #else /* * We can't just use a direct branch to .slb_miss_realmode * because the distance from here to there depends on where * the kernel ends up being put. */ mfctr r11 ld r10,PACAKBASE(r13) LOAD_HANDLER(r10, .slb_miss_realmode) mtctr r10 bctr #endif STD_EXCEPTION_PSERIES(0x400, instruction_access) . = 0x480 .globl instruction_access_slb_pSeries instruction_access_slb_pSeries: HMT_MEDIUM mtspr SPRN_SPRG1,r13 mfspr r13,SPRN_SPRG3 /* get paca address into r13 */ std r3,PACA_EXSLB+EX_R3(r13) mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */ std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */ mfcr r9 #ifdef __DISABLED__ /* Keep that around for when we re-implement dynamic VSIDs */ cmpdi r3,0 bge slb_miss_user_pseries #endif /* __DISABLED__ */ std r10,PACA_EXSLB+EX_R10(r13) std r11,PACA_EXSLB+EX_R11(r13) std r12,PACA_EXSLB+EX_R12(r13) mfspr r10,SPRN_SPRG1 std r10,PACA_EXSLB+EX_R13(r13) mfspr r12,SPRN_SRR1 /* and SRR1 */ #ifndef CONFIG_RELOCATABLE b .slb_miss_realmode #else mfctr r11 ld r10,PACAKBASE(r13) LOAD_HANDLER(r10, .slb_miss_realmode) mtctr r10 bctr #endif MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt) STD_EXCEPTION_PSERIES(0x600, alignment) STD_EXCEPTION_PSERIES(0x700, program_check) STD_EXCEPTION_PSERIES(0x800, fp_unavailable) MASKABLE_EXCEPTION_PSERIES(0x900, decrementer) STD_EXCEPTION_PSERIES(0xa00, trap_0a) STD_EXCEPTION_PSERIES(0xb00, trap_0b) . = 0xc00 .globl system_call_pSeries system_call_pSeries: HMT_MEDIUM BEGIN_FTR_SECTION cmpdi r0,0x1ebe beq- 1f END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) mr r9,r13 mfspr r13,SPRN_SPRG3 mfspr r11,SPRN_SRR0 ld r12,PACAKBASE(r13) ld r10,PACAKMSR(r13) LOAD_HANDLER(r12, system_call_entry) mtspr SPRN_SRR0,r12 mfspr r12,SPRN_SRR1 mtspr SPRN_SRR1,r10 rfid b . /* prevent speculative execution */ /* Fast LE/BE switch system call */ 1: mfspr r12,SPRN_SRR1 xori r12,r12,MSR_LE mtspr SPRN_SRR1,r12 rfid /* return to userspace */ b . STD_EXCEPTION_PSERIES(0xd00, single_step) STD_EXCEPTION_PSERIES(0xe00, trap_0e) /* We need to deal with the Altivec unavailable exception * here which is at 0xf20, thus in the middle of the * prolog code of the PerformanceMonitor one. A little * trickery is thus necessary */ . = 0xf00 b performance_monitor_pSeries . = 0xf20 b altivec_unavailable_pSeries . = 0xf40 b vsx_unavailable_pSeries #ifdef CONFIG_CBE_RAS HSTD_EXCEPTION_PSERIES(0x1200, cbe_system_error) #endif /* CONFIG_CBE_RAS */ STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint) #ifdef CONFIG_CBE_RAS HSTD_EXCEPTION_PSERIES(0x1600, cbe_maintenance) #endif /* CONFIG_CBE_RAS */ STD_EXCEPTION_PSERIES(0x1700, altivec_assist) #ifdef CONFIG_CBE_RAS HSTD_EXCEPTION_PSERIES(0x1800, cbe_thermal) #endif /* CONFIG_CBE_RAS */ . = 0x3000 /*** pSeries interrupt support ***/ /* moved from 0xf00 */ STD_EXCEPTION_PSERIES(., performance_monitor) STD_EXCEPTION_PSERIES(., altivec_unavailable) STD_EXCEPTION_PSERIES(., vsx_unavailable) /* * An interrupt came in while soft-disabled; clear EE in SRR1, * clear paca->hard_enabled and return. */ masked_interrupt: stb r10,PACAHARDIRQEN(r13) mtcrf 0x80,r9 ld r9,PACA_EXGEN+EX_R9(r13) mfspr r10,SPRN_SRR1 rldicl r10,r10,48,1 /* clear MSR_EE */ rotldi r10,r10,16 mtspr SPRN_SRR1,r10 ld r10,PACA_EXGEN+EX_R10(r13) mfspr r13,SPRN_SPRG1 rfid b . .align 7 do_stab_bolted_pSeries: mtcrf 0x80,r12 mfspr r12,SPRN_SPRG2 EXCEPTION_PROLOG_PSERIES(PACA_EXSLB, .do_stab_bolted) #ifdef CONFIG_PPC_PSERIES /* * Vectors for the FWNMI option. Share common code. */ .globl system_reset_fwnmi .align 7 system_reset_fwnmi: HMT_MEDIUM mtspr SPRN_SPRG1,r13 /* save r13 */ EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common) .globl machine_check_fwnmi .align 7 machine_check_fwnmi: HMT_MEDIUM mtspr SPRN_SPRG1,r13 /* save r13 */ EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common) #endif /* CONFIG_PPC_PSERIES */ #ifdef __DISABLED__ /* * This is used for when the SLB miss handler has to go virtual, * which doesn't happen for now anymore but will once we re-implement * dynamic VSIDs for shared page tables */ slb_miss_user_pseries: std r10,PACA_EXGEN+EX_R10(r13) std r11,PACA_EXGEN+EX_R11(r13) std r12,PACA_EXGEN+EX_R12(r13) mfspr r10,SPRG1 ld r11,PACA_EXSLB+EX_R9(r13) ld r12,PACA_EXSLB+EX_R3(r13) std r10,PACA_EXGEN+EX_R13(r13) std r11,PACA_EXGEN+EX_R9(r13) std r12,PACA_EXGEN+EX_R3(r13) clrrdi r12,r13,32 mfmsr r10 mfspr r11,SRR0 /* save SRR0 */ ori r12,r12,slb_miss_user_common@l /* virt addr of handler */ ori r10,r10,MSR_IR|MSR_DR|MSR_RI mtspr SRR0,r12 mfspr r12,SRR1 /* and SRR1 */ mtspr SRR1,r10 rfid b . /* prevent spec. execution */ #endif /* __DISABLED__ */ .align 7 .globl __end_interrupts __end_interrupts: /* * Code from here down to __end_handlers is invoked from the * exception prologs above. Because the prologs assemble the * addresses of these handlers using the LOAD_HANDLER macro, * which uses an addi instruction, these handlers must be in * the first 32k of the kernel image. */ /*** Common interrupt handlers ***/ STD_EXCEPTION_COMMON(0x100, system_reset, .system_reset_exception) /* * Machine check is different because we use a different * save area: PACA_EXMC instead of PACA_EXGEN. */ .align 7 .globl machine_check_common machine_check_common: EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC) FINISH_NAP DISABLE_INTS bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD bl .machine_check_exception b .ret_from_except STD_EXCEPTION_COMMON_LITE(0x900, decrementer, .timer_interrupt) STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception) STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception) STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception) STD_EXCEPTION_COMMON(0xe00, trap_0e, .unknown_exception) STD_EXCEPTION_COMMON_IDLE(0xf00, performance_monitor, .performance_monitor_exception) STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, .instruction_breakpoint_exception) #ifdef CONFIG_ALTIVEC STD_EXCEPTION_COMMON(0x1700, altivec_assist, .altivec_assist_exception) #else STD_EXCEPTION_COMMON(0x1700, altivec_assist, .unknown_exception) #endif #ifdef CONFIG_CBE_RAS STD_EXCEPTION_COMMON(0x1200, cbe_system_error, .cbe_system_error_exception) STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, .cbe_maintenance_exception) STD_EXCEPTION_COMMON(0x1800, cbe_thermal, .cbe_thermal_exception) #endif /* CONFIG_CBE_RAS */ .align 7 system_call_entry: b system_call_common /* * Here we have detected that the kernel stack pointer is bad. * R9 contains the saved CR, r13 points to the paca, * r10 contains the (bad) kernel stack pointer, * r11 and r12 contain the saved SRR0 and SRR1. * We switch to using an emergency stack, save the registers there, * and call kernel_bad_stack(), which panics. */ bad_stack: ld r1,PACAEMERGSP(r13) subi r1,r1,64+INT_FRAME_SIZE std r9,_CCR(r1) std r10,GPR1(r1) std r11,_NIP(r1) std r12,_MSR(r1) mfspr r11,SPRN_DAR mfspr r12,SPRN_DSISR std r11,_DAR(r1) std r12,_DSISR(r1) mflr r10 mfctr r11 mfxer r12 std r10,_LINK(r1) std r11,_CTR(r1) std r12,_XER(r1) SAVE_GPR(0,r1) SAVE_GPR(2,r1) SAVE_4GPRS(3,r1) SAVE_2GPRS(7,r1) SAVE_10GPRS(12,r1) SAVE_10GPRS(22,r1) lhz r12,PACA_TRAP_SAVE(r13) std r12,_TRAP(r1) addi r11,r1,INT_FRAME_SIZE std r11,0(r1) li r12,0 std r12,0(r11) ld r2,PACATOC(r13) 1: addi r3,r1,STACK_FRAME_OVERHEAD bl .kernel_bad_stack b 1b /* * Here r13 points to the paca, r9 contains the saved CR, * SRR0 and SRR1 are saved in r11 and r12, * r9 - r13 are saved in paca->exgen. */ .align 7 .globl data_access_common data_access_common: mfspr r10,SPRN_DAR std r10,PACA_EXGEN+EX_DAR(r13) mfspr r10,SPRN_DSISR stw r10,PACA_EXGEN+EX_DSISR(r13) EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN) ld r3,PACA_EXGEN+EX_DAR(r13) lwz r4,PACA_EXGEN+EX_DSISR(r13) li r5,0x300 b .do_hash_page /* Try to handle as hpte fault */ .align 7 .globl instruction_access_common instruction_access_common: EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN) ld r3,_NIP(r1) andis. r4,r12,0x5820 li r5,0x400 b .do_hash_page /* Try to handle as hpte fault */ /* * Here is the common SLB miss user that is used when going to virtual * mode for SLB misses, that is currently not used */ #ifdef __DISABLED__ .align 7 .globl slb_miss_user_common slb_miss_user_common: mflr r10 std r3,PACA_EXGEN+EX_DAR(r13) stw r9,PACA_EXGEN+EX_CCR(r13) std r10,PACA_EXGEN+EX_LR(r13) std r11,PACA_EXGEN+EX_SRR0(r13) bl .slb_allocate_user ld r10,PACA_EXGEN+EX_LR(r13) ld r3,PACA_EXGEN+EX_R3(r13) lwz r9,PACA_EXGEN+EX_CCR(r13) ld r11,PACA_EXGEN+EX_SRR0(r13) mtlr r10 beq- slb_miss_fault andi. r10,r12,MSR_RI /* check for unrecoverable exception */ beq- unrecov_user_slb mfmsr r10 .machine push .machine "power4" mtcrf 0x80,r9 .machine pop clrrdi r10,r10,2 /* clear RI before setting SRR0/1 */ mtmsrd r10,1 mtspr SRR0,r11 mtspr SRR1,r12 ld r9,PACA_EXGEN+EX_R9(r13) ld r10,PACA_EXGEN+EX_R10(r13) ld r11,PACA_EXGEN+EX_R11(r13) ld r12,PACA_EXGEN+EX_R12(r13) ld r13,PACA_EXGEN+EX_R13(r13) rfid b . slb_miss_fault: EXCEPTION_PROLOG_COMMON(0x380, PACA_EXGEN) ld r4,PACA_EXGEN+EX_DAR(r13) li r5,0 std r4,_DAR(r1) std r5,_DSISR(r1) b handle_page_fault unrecov_user_slb: EXCEPTION_PROLOG_COMMON(0x4200, PACA_EXGEN) DISABLE_INTS bl .save_nvgprs 1: addi r3,r1,STACK_FRAME_OVERHEAD bl .unrecoverable_exception b 1b #endif /* __DISABLED__ */ /* * r13 points to the PACA, r9 contains the saved CR, * r12 contain the saved SRR1, SRR0 is still ready for return * r3 has the faulting address * r9 - r13 are saved in paca->exslb. * r3 is saved in paca->slb_r3 * We assume we aren't going to take any exceptions during this procedure. */ _GLOBAL(slb_miss_realmode) mflr r10 #ifdef CONFIG_RELOCATABLE mtctr r11 #endif stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ std r10,PACA_EXSLB+EX_LR(r13) /* save LR */ bl .slb_allocate_realmode /* All done -- return from exception. */ ld r10,PACA_EXSLB+EX_LR(r13) ld r3,PACA_EXSLB+EX_R3(r13) lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ #ifdef CONFIG_PPC_ISERIES BEGIN_FW_FTR_SECTION ld r11,PACALPPACAPTR(r13) ld r11,LPPACASRR0(r11) /* get SRR0 value */ END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) #endif /* CONFIG_PPC_ISERIES */ mtlr r10 andi. r10,r12,MSR_RI /* check for unrecoverable exception */ beq- 2f .machine push .machine "power4" mtcrf 0x80,r9 mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */ .machine pop #ifdef CONFIG_PPC_ISERIES BEGIN_FW_FTR_SECTION mtspr SPRN_SRR0,r11 mtspr SPRN_SRR1,r12 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) #endif /* CONFIG_PPC_ISERIES */ ld r9,PACA_EXSLB+EX_R9(r13) ld r10,PACA_EXSLB+EX_R10(r13) ld r11,PACA_EXSLB+EX_R11(r13) ld r12,PACA_EXSLB+EX_R12(r13) ld r13,PACA_EXSLB+EX_R13(r13) rfid b . /* prevent speculative execution */ 2: #ifdef CONFIG_PPC_ISERIES BEGIN_FW_FTR_SECTION b unrecov_slb END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) #endif /* CONFIG_PPC_ISERIES */ mfspr r11,SPRN_SRR0 ld r10,PACAKBASE(r13) LOAD_HANDLER(r10,unrecov_slb) mtspr SPRN_SRR0,r10 ld r10,PACAKMSR(r13) mtspr SPRN_SRR1,r10 rfid b . unrecov_slb: EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB) DISABLE_INTS bl .save_nvgprs 1: addi r3,r1,STACK_FRAME_OVERHEAD bl .unrecoverable_exception b 1b .align 7 .globl hardware_interrupt_common .globl hardware_interrupt_entry hardware_interrupt_common: EXCEPTION_PROLOG_COMMON(0x500, PACA_EXGEN) FINISH_NAP hardware_interrupt_entry: DISABLE_INTS BEGIN_FTR_SECTION bl .ppc64_runlatch_on END_FTR_SECTION_IFSET(CPU_FTR_CTRL) addi r3,r1,STACK_FRAME_OVERHEAD bl .do_IRQ b .ret_from_except_lite #ifdef CONFIG_PPC_970_NAP power4_fixup_nap: andc r9,r9,r10 std r9,TI_LOCAL_FLAGS(r11) ld r10,_LINK(r1) /* make idle task do the */ std r10,_NIP(r1) /* equivalent of a blr */ blr #endif .align 7 .globl alignment_common alignment_common: mfspr r10,SPRN_DAR std r10,PACA_EXGEN+EX_DAR(r13) mfspr r10,SPRN_DSISR stw r10,PACA_EXGEN+EX_DSISR(r13) EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN) ld r3,PACA_EXGEN+EX_DAR(r13) lwz r4,PACA_EXGEN+EX_DSISR(r13) std r3,_DAR(r1) std r4,_DSISR(r1) bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD ENABLE_INTS bl .alignment_exception b .ret_from_except .align 7 .globl program_check_common program_check_common: EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN) bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD ENABLE_INTS bl .program_check_exception b .ret_from_except .align 7 .globl fp_unavailable_common fp_unavailable_common: EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN) bne 1f /* if from user, just load it up */ bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD ENABLE_INTS bl .kernel_fp_unavailable_exception BUG_OPCODE 1: bl .load_up_fpu b fast_exception_return .align 7 .globl altivec_unavailable_common altivec_unavailable_common: EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN) #ifdef CONFIG_ALTIVEC BEGIN_FTR_SECTION beq 1f bl .load_up_altivec b fast_exception_return 1: END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) #endif bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD ENABLE_INTS bl .altivec_unavailable_exception b .ret_from_except .align 7 .globl vsx_unavailable_common vsx_unavailable_common: EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN) #ifdef CONFIG_VSX BEGIN_FTR_SECTION bne .load_up_vsx 1: END_FTR_SECTION_IFSET(CPU_FTR_VSX) #endif bl .save_nvgprs addi r3,r1,STACK_FRAME_OVERHEAD ENABLE_INTS bl .vsx_unavailable_exception b .ret_from_except .align 7 .globl __end_handlers __end_handlers: /* * Return from an exception with minimal checks. * The caller is assumed to have done EXCEPTION_PROLOG_COMMON. * If interrupts have been enabled, or anything has been * done that might have changed the scheduling status of * any task or sent any task a signal, you should use * ret_from_except or ret_from_except_lite instead of this. */ fast_exc_return_irq: /* restores irq state too */ ld r3,SOFTE(r1) TRACE_AND_RESTORE_IRQ(r3); ld r12,_MSR(r1) rldicl r4,r12,49,63 /* get MSR_EE to LSB */ stb r4,PACAHARDIRQEN(r13) /* restore paca->hard_enabled */ b 1f .globl fast_exception_return fast_exception_return: ld r12,_MSR(r1) 1: ld r11,_NIP(r1) andi. r3,r12,MSR_RI /* check if RI is set */ beq- unrecov_fer #ifdef CONFIG_VIRT_CPU_ACCOUNTING andi. r3,r12,MSR_PR beq 2f ACCOUNT_CPU_USER_EXIT(r3, r4) 2: #endif ld r3,_CCR(r1) ld r4,_LINK(r1) ld r5,_CTR(r1) ld r6,_XER(r1) mtcr r3 mtlr r4 mtctr r5 mtxer r6 REST_GPR(0, r1) REST_8GPRS(2, r1) mfmsr r10 rldicl r10,r10,48,1 /* clear EE */ rldicr r10,r10,16,61 /* clear RI (LE is 0 already) */ mtmsrd r10,1 mtspr SPRN_SRR1,r12 mtspr SPRN_SRR0,r11 REST_4GPRS(10, r1) ld r1,GPR1(r1) rfid b . /* prevent speculative execution */ unrecov_fer: bl .save_nvgprs 1: addi r3,r1,STACK_FRAME_OVERHEAD bl .unrecoverable_exception b 1b #ifdef CONFIG_ALTIVEC /* * load_up_altivec(unused, unused, tsk) * Disable VMX for the task which had it previously, * and save its vector registers in its thread_struct. * Enables the VMX for use in the kernel on return. * On SMP we know the VMX is free, since we give it up every * switch (ie, no lazy save of the vector registers). * On entry: r13 == 'current' && last_task_used_altivec != 'current' */ _STATIC(load_up_altivec) mfmsr r5 /* grab the current MSR */ oris r5,r5,MSR_VEC@h mtmsrd r5 /* enable use of VMX now */ isync /* * For SMP, we don't do lazy VMX switching because it just gets too * horrendously complex, especially when a task switches from one CPU * to another. Instead we call giveup_altvec in switch_to. * VRSAVE isn't dealt with here, that is done in the normal context * switch code. Note that we could rely on vrsave value to eventually * avoid saving all of the VREGs here... */ #ifndef CONFIG_SMP ld r3,last_task_used_altivec@got(r2) ld r4,0(r3) cmpdi 0,r4,0 beq 1f /* Save VMX state to last_task_used_altivec's THREAD struct */ addi r4,r4,THREAD SAVE_32VRS(0,r5,r4) mfvscr vr0 li r10,THREAD_VSCR stvx vr0,r10,r4 /* Disable VMX for last_task_used_altivec */ ld r5,PT_REGS(r4) ld r4,_MSR-STACK_FRAME_OVERHEAD(r5) lis r6,MSR_VEC@h andc r4,r4,r6 std r4,_MSR-STACK_FRAME_OVERHEAD(r5) 1: #endif /* CONFIG_SMP */ /* Hack: if we get an altivec unavailable trap with VRSAVE * set to all zeros, we assume this is a broken application * that fails to set it properly, and thus we switch it to * all 1's */ mfspr r4,SPRN_VRSAVE cmpdi 0,r4,0 bne+ 1f li r4,-1 mtspr SPRN_VRSAVE,r4 1: /* enable use of VMX after return */ ld r4,PACACURRENT(r13) addi r5,r4,THREAD /* Get THREAD */ oris r12,r12,MSR_VEC@h std r12,_MSR(r1) li r4,1 li r10,THREAD_VSCR stw r4,THREAD_USED_VR(r5) lvx vr0,r10,r5 mtvscr vr0 REST_32VRS(0,r4,r5) #ifndef CONFIG_SMP /* Update last_task_used_math to 'current' */ subi r4,r5,THREAD /* Back to 'current' */ std r4,0(r3) #endif /* CONFIG_SMP */ /* restore registers and return */ blr #endif /* CONFIG_ALTIVEC */ #ifdef CONFIG_VSX /* * load_up_vsx(unused, unused, tsk) * Disable VSX for the task which had it previously, * and save its vector registers in its thread_struct. * Reuse the fp and vsx saves, but first check to see if they have * been saved already. * On entry: r13 == 'current' && last_task_used_vsx != 'current' */ _STATIC(load_up_vsx) /* Load FP and VSX registers if they haven't been done yet */ andi. r5,r12,MSR_FP beql+ load_up_fpu /* skip if already loaded */ andis. r5,r12,MSR_VEC@h beql+ load_up_altivec /* skip if already loaded */ #ifndef CONFIG_SMP ld r3,last_task_used_vsx@got(r2) ld r4,0(r3) cmpdi 0,r4,0 beq 1f /* Disable VSX for last_task_used_vsx */ addi r4,r4,THREAD ld r5,PT_REGS(r4) ld r4,_MSR-STACK_FRAME_OVERHEAD(r5) lis r6,MSR_VSX@h andc r6,r4,r6 std r6,_MSR-STACK_FRAME_OVERHEAD(r5) 1: #endif /* CONFIG_SMP */ ld r4,PACACURRENT(r13) addi r4,r4,THREAD /* Get THREAD */ li r6,1 stw r6,THREAD_USED_VSR(r4) /* ... also set thread used vsr */ /* enable use of VSX after return */ oris r12,r12,MSR_VSX@h std r12,_MSR(r1) #ifndef CONFIG_SMP /* Update last_task_used_math to 'current' */ ld r4,PACACURRENT(r13) std r4,0(r3) #endif /* CONFIG_SMP */ b fast_exception_return #endif /* CONFIG_VSX */ /* * Hash table stuff */ .align 7 _STATIC(do_hash_page) std r3,_DAR(r1) std r4,_DSISR(r1) andis. r0,r4,0xa450 /* weird error? */ bne- handle_page_fault /* if not, try to insert a HPTE */ BEGIN_FTR_SECTION andis. r0,r4,0x0020 /* Is it a segment table fault? */ bne- do_ste_alloc /* If so handle it */ END_FTR_SECTION_IFCLR(CPU_FTR_SLB) /* * On iSeries, we soft-disable interrupts here, then * hard-enable interrupts so that the hash_page code can spin on * the hash_table_lock without problems on a shared processor. */ DISABLE_INTS /* * Currently, trace_hardirqs_off() will be called by DISABLE_INTS * and will clobber volatile registers when irq tracing is enabled * so we need to reload them. It may be possible to be smarter here * and move the irq tracing elsewhere but let's keep it simple for * now */ #ifdef CONFIG_TRACE_IRQFLAGS ld r3,_DAR(r1) ld r4,_DSISR(r1) ld r5,_TRAP(r1) ld r12,_MSR(r1) clrrdi r5,r5,4 #endif /* CONFIG_TRACE_IRQFLAGS */ /* * We need to set the _PAGE_USER bit if MSR_PR is set or if we are * accessing a userspace segment (even from the kernel). We assume * kernel addresses always have the high bit set. */ rlwinm r4,r4,32-25+9,31-9,31-9 /* DSISR_STORE -> _PAGE_RW */ rotldi r0,r3,15 /* Move high bit into MSR_PR posn */ orc r0,r12,r0 /* MSR_PR | ~high_bit */ rlwimi r4,r0,32-13,30,30 /* becomes _PAGE_USER access bit */ ori r4,r4,1 /* add _PAGE_PRESENT */ rlwimi r4,r5,22+2,31-2,31-2 /* Set _PAGE_EXEC if trap is 0x400 */ /* * r3 contains the faulting address * r4 contains the required access permissions * r5 contains the trap number * * at return r3 = 0 for success */ bl .hash_page /* build HPTE if possible */ cmpdi r3,0 /* see if hash_page succeeded */ BEGIN_FW_FTR_SECTION /* * If we had interrupts soft-enabled at the point where the * DSI/ISI occurred, and an interrupt came in during hash_page, * handle it now. * We jump to ret_from_except_lite rather than fast_exception_return * because ret_from_except_lite will check for and handle pending * interrupts if necessary. */ beq 13f END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) BEGIN_FW_FTR_SECTION /* * Here we have interrupts hard-disabled, so it is sufficient * to restore paca->{soft,hard}_enable and get out. */ beq fast_exc_return_irq /* Return from exception on success */ END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) /* For a hash failure, we don't bother re-enabling interrupts */ ble- 12f /* * hash_page couldn't handle it, set soft interrupt enable back * to what it was before the trap. Note that .raw_local_irq_restore * handles any interrupts pending at this point. */ ld r3,SOFTE(r1) TRACE_AND_RESTORE_IRQ_PARTIAL(r3, 11f) bl .raw_local_irq_restore b 11f /* Here we have a page fault that hash_page can't handle. */ handle_page_fault: ENABLE_INTS 11: ld r4,_DAR(r1) ld r5,_DSISR(r1) addi r3,r1,STACK_FRAME_OVERHEAD bl .do_page_fault cmpdi r3,0 beq+ 13f bl .save_nvgprs mr r5,r3 addi r3,r1,STACK_FRAME_OVERHEAD lwz r4,_DAR(r1) bl .bad_page_fault b .ret_from_except 13: b .ret_from_except_lite /* We have a page fault that hash_page could handle but HV refused * the PTE insertion */ 12: bl .save_nvgprs mr r5,r3 addi r3,r1,STACK_FRAME_OVERHEAD ld r4,_DAR(r1) bl .low_hash_fault b .ret_from_except /* here we have a segment miss */ do_ste_alloc: bl .ste_allocate /* try to insert stab entry */ cmpdi r3,0 bne- handle_page_fault b fast_exception_return /* * r13 points to the PACA, r9 contains the saved CR, * r11 and r12 contain the saved SRR0 and SRR1. * r9 - r13 are saved in paca->exslb. * We assume we aren't going to take any exceptions during this procedure. * We assume (DAR >> 60) == 0xc. */ .align 7 _GLOBAL(do_stab_bolted) stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */ std r11,PACA_EXSLB+EX_SRR0(r13) /* save SRR0 in exc. frame */ /* Hash to the primary group */ ld r10,PACASTABVIRT(r13) mfspr r11,SPRN_DAR srdi r11,r11,28 rldimi r10,r11,7,52 /* r10 = first ste of the group */ /* Calculate VSID */ /* This is a kernel address, so protovsid = ESID */ ASM_VSID_SCRAMBLE(r11, r9, 256M) rldic r9,r11,12,16 /* r9 = vsid << 12 */ /* Search the primary group for a free entry */ 1: ld r11,0(r10) /* Test valid bit of the current ste */ andi. r11,r11,0x80 beq 2f addi r10,r10,16 andi. r11,r10,0x70 bne 1b /* Stick for only searching the primary group for now. */ /* At least for now, we use a very simple random castout scheme */ /* Use the TB as a random number ; OR in 1 to avoid entry 0 */ mftb r11 rldic r11,r11,4,57 /* r11 = (r11 << 4) & 0x70 */ ori r11,r11,0x10 /* r10 currently points to an ste one past the group of interest */ /* make it point to the randomly selected entry */ subi r10,r10,128 or r10,r10,r11 /* r10 is the entry to invalidate */ isync /* mark the entry invalid */ ld r11,0(r10) rldicl r11,r11,56,1 /* clear the valid bit */ rotldi r11,r11,8 std r11,0(r10) sync clrrdi r11,r11,28 /* Get the esid part of the ste */ slbie r11 2: std r9,8(r10) /* Store the vsid part of the ste */ eieio mfspr r11,SPRN_DAR /* Get the new esid */ clrrdi r11,r11,28 /* Permits a full 32b of ESID */ ori r11,r11,0x90 /* Turn on valid and kp */ std r11,0(r10) /* Put new entry back into the stab */ sync /* All done -- return from exception. */ lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */ ld r11,PACA_EXSLB+EX_SRR0(r13) /* get saved SRR0 */ andi. r10,r12,MSR_RI beq- unrecov_slb mtcrf 0x80,r9 /* restore CR */ mfmsr r10 clrrdi r10,r10,2 mtmsrd r10,1 mtspr SPRN_SRR0,r11 mtspr SPRN_SRR1,r12 ld r9,PACA_EXSLB+EX_R9(r13) ld r10,PACA_EXSLB+EX_R10(r13) ld r11,PACA_EXSLB+EX_R11(r13) ld r12,PACA_EXSLB+EX_R12(r13) ld r13,PACA_EXSLB+EX_R13(r13) rfid b . /* prevent speculative execution */ /* * Space for CPU0's segment table. * * On iSeries, the hypervisor must fill in at least one entry before * we get control (with relocate on). The address is given to the hv * as a page number (see xLparMap below), so this must be at a * fixed address (the linker can't compute (u64)&initial_stab >> * PAGE_SHIFT). */ . = STAB0_OFFSET /* 0x6000 */ .globl initial_stab initial_stab: .space 4096 #ifdef CONFIG_PPC_PSERIES /* * Data area reserved for FWNMI option. * This address (0x7000) is fixed by the RPA. */ .= 0x7000 .globl fwnmi_data_area fwnmi_data_area: #endif /* CONFIG_PPC_PSERIES */ /* iSeries does not use the FWNMI stuff, so it is safe to put * this here, even if we later allow kernels that will boot on * both pSeries and iSeries */ #ifdef CONFIG_PPC_ISERIES . = LPARMAP_PHYS .globl xLparMap xLparMap: .quad HvEsidsToMap /* xNumberEsids */ .quad HvRangesToMap /* xNumberRanges */ .quad STAB0_PAGE /* xSegmentTableOffs */ .zero 40 /* xRsvd */ /* xEsids (HvEsidsToMap entries of 2 quads) */ .quad PAGE_OFFSET_ESID /* xKernelEsid */ .quad PAGE_OFFSET_VSID /* xKernelVsid */ .quad VMALLOC_START_ESID /* xKernelEsid */ .quad VMALLOC_START_VSID /* xKernelVsid */ /* xRanges (HvRangesToMap entries of 3 quads) */ .quad HvPagesToMap /* xPages */ .quad 0 /* xOffset */ .quad PAGE_OFFSET_VSID << (SID_SHIFT - HW_PAGE_SHIFT) /* xVPN */ #endif /* CONFIG_PPC_ISERIES */ #ifdef CONFIG_PPC_PSERIES . = 0x8000 #endif /* CONFIG_PPC_PSERIES */ /* * On pSeries and most other platforms, secondary processors spin * in the following code. * At entry, r3 = this processor's number (physical cpu id) */ _GLOBAL(generic_secondary_smp_init) mr r24,r3 /* turn on 64-bit mode */ bl .enable_64b_mode /* get the TOC pointer (real address) */ bl .relative_toc /* Set up a paca value for this processor. Since we have the * physical cpu id in r24, we need to search the pacas to find * which logical id maps to our physical one. */ LOAD_REG_ADDR(r13, paca) /* Get base vaddr of paca array */ li r5,0 /* logical cpu id */ 1: lhz r6,PACAHWCPUID(r13) /* Load HW procid from paca */ cmpw r6,r24 /* Compare to our id */ beq 2f addi r13,r13,PACA_SIZE /* Loop to next PACA on miss */ addi r5,r5,1 cmpwi r5,NR_CPUS blt 1b mr r3,r24 /* not found, copy phys to r3 */ b .kexec_wait /* next kernel might do better */ 2: mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */ /* From now on, r24 is expected to be logical cpuid */ mr r24,r5 3: HMT_LOW lbz r23,PACAPROCSTART(r13) /* Test if this processor should */ /* start. */ #ifndef CONFIG_SMP b 3b /* Never go on non-SMP */ #else cmpwi 0,r23,0 beq 3b /* Loop until told to go */ sync /* order paca.run and cur_cpu_spec */ /* See if we need to call a cpu state restore handler */ LOAD_REG_ADDR(r23, cur_cpu_spec) ld r23,0(r23) ld r23,CPU_SPEC_RESTORE(r23) cmpdi 0,r23,0 beq 4f ld r23,0(r23) mtctr r23 bctrl 4: /* Create a temp kernel stack for use before relocation is on. */ ld r1,PACAEMERGSP(r13) subi r1,r1,STACK_FRAME_OVERHEAD b __secondary_start #endif /* * Turn the MMU off. * Assumes we're mapped EA == RA if the MMU is on. */ _STATIC(__mmu_off) mfmsr r3 andi. r0,r3,MSR_IR|MSR_DR beqlr mflr r4 andc r3,r3,r0 mtspr SPRN_SRR0,r4 mtspr SPRN_SRR1,r3 sync rfid b . /* prevent speculative execution */ /* * Here is our main kernel entry point. We support currently 2 kind of entries * depending on the value of r5. * * r5 != NULL -> OF entry, we go to prom_init, "legacy" parameter content * in r3...r7 * * r5 == NULL -> kexec style entry. r3 is a physical pointer to the * DT block, r4 is a physical pointer to the kernel itself * */ _GLOBAL(__start_initialization_multiplatform) /* Make sure we are running in 64 bits mode */ bl .enable_64b_mode /* Get TOC pointer (current runtime address) */ bl .relative_toc /* find out where we are now */ bcl 20,31,$+4 0: mflr r26 /* r26 = runtime addr here */ addis r26,r26,(_stext - 0b)@ha addi r26,r26,(_stext - 0b)@l /* current runtime base addr */ /* * Are we booted from a PROM Of-type client-interface ? */ cmpldi cr0,r5,0 beq 1f b .__boot_from_prom /* yes -> prom */ 1: /* Save parameters */ mr r31,r3 mr r30,r4 /* Setup some critical 970 SPRs before switching MMU off */ mfspr r0,SPRN_PVR srwi r0,r0,16 cmpwi r0,0x39 /* 970 */ beq 1f cmpwi r0,0x3c /* 970FX */ beq 1f cmpwi r0,0x44 /* 970MP */ beq 1f cmpwi r0,0x45 /* 970GX */ bne 2f 1: bl .__cpu_preinit_ppc970 2: /* Switch off MMU if not already off */ bl .__mmu_off b .__after_prom_start _INIT_STATIC(__boot_from_prom) #ifdef CONFIG_PPC_OF_BOOT_TRAMPOLINE /* Save parameters */ mr r31,r3 mr r30,r4 mr r29,r5 mr r28,r6 mr r27,r7 /* * Align the stack to 16-byte boundary * Depending on the size and layout of the ELF sections in the initial * boot binary, the stack pointer may be unaligned on PowerMac */ rldicr r1,r1,0,59 #ifdef CONFIG_RELOCATABLE /* Relocate code for where we are now */ mr r3,r26 bl .relocate #endif /* Restore parameters */ mr r3,r31 mr r4,r30 mr r5,r29 mr r6,r28 mr r7,r27 /* Do all of the interaction with OF client interface */ mr r8,r26 bl .prom_init #endif /* #CONFIG_PPC_OF_BOOT_TRAMPOLINE */ /* We never return. We also hit that trap if trying to boot * from OF while CONFIG_PPC_OF_BOOT_TRAMPOLINE isn't selected */ trap _STATIC(__after_prom_start) #ifdef CONFIG_RELOCATABLE /* process relocations for the final address of the kernel */ lis r25,PAGE_OFFSET@highest /* compute virtual base of kernel */ sldi r25,r25,32 #ifdef CONFIG_CRASH_DUMP lwz r7,__run_at_load-_stext(r26) cmplwi cr0,r7,1 /* kdump kernel ? - stay where we are */ bne 1f add r25,r25,r26 #endif 1: mr r3,r25 bl .relocate #endif /* * We need to run with _stext at physical address PHYSICAL_START. * This will leave some code in the first 256B of * real memory, which are reserved for software use. * * Note: This process overwrites the OF exception vectors. */ li r3,0 /* target addr */ mr. r4,r26 /* In some cases the loader may */ beq 9f /* have already put us at zero */ li r6,0x100 /* Start offset, the first 0x100 */ /* bytes were copied earlier. */ #ifdef CONFIG_CRASH_DUMP /* * Check if the kernel has to be running as relocatable kernel based on the * variable __run_at_load, if it is set the kernel is treated as relocatable * kernel, otherwise it will be moved to PHYSICAL_START */ lwz r7,__run_at_load-_stext(r26) cmplwi cr0,r7,1 bne 3f li r5,__end_interrupts - _stext /* just copy interrupts */ b 5f 3: #endif lis r5,(copy_to_here - _stext)@ha addi r5,r5,(copy_to_here - _stext)@l /* # bytes of memory to copy */ bl .copy_and_flush /* copy the first n bytes */ /* this includes the code being */ /* executed here. */ addis r8,r3,(4f - _stext)@ha /* Jump to the copy of this code */ addi r8,r8,(4f - _stext)@l /* that we just made */ mtctr r8 bctr p_end: .llong _end - _stext 4: /* Now copy the rest of the kernel up to _end */ addis r5,r26,(p_end - _stext)@ha ld r5,(p_end - _stext)@l(r5) /* get _end */ 5: bl .copy_and_flush /* copy the rest */ 9: b .start_here_multiplatform /* * Copy routine used to copy the kernel to start at physical address 0 * and flush and invalidate the caches as needed. * r3 = dest addr, r4 = source addr, r5 = copy limit, r6 = start offset * on exit, r3, r4, r5 are unchanged, r6 is updated to be >= r5. * * Note: this routine *only* clobbers r0, r6 and lr */ _GLOBAL(copy_and_flush) addi r5,r5,-8 addi r6,r6,-8 4: li r0,8 /* Use the smallest common */ /* denominator cache line */ /* size. This results in */ /* extra cache line flushes */ /* but operation is correct. */ /* Can't get cache line size */ /* from NACA as it is being */ /* moved too. */ mtctr r0 /* put # words/line in ctr */ 3: addi r6,r6,8 /* copy a cache line */ ldx r0,r6,r4 stdx r0,r6,r3 bdnz 3b dcbst r6,r3 /* write it to memory */ sync icbi r6,r3 /* flush the icache line */ cmpld 0,r6,r5 blt 4b sync addi r5,r5,8 addi r6,r6,8 blr .align 8 copy_to_here: #ifdef CONFIG_SMP #ifdef CONFIG_PPC_PMAC /* * On PowerMac, secondary processors starts from the reset vector, which * is temporarily turned into a call to one of the functions below. */ .section ".text"; .align 2 ; .globl __secondary_start_pmac_0 __secondary_start_pmac_0: /* NB the entries for cpus 0, 1, 2 must each occupy 8 bytes. */ li r24,0 b 1f li r24,1 b 1f li r24,2 b 1f li r24,3 1: _GLOBAL(pmac_secondary_start) /* turn on 64-bit mode */ bl .enable_64b_mode li r0,0 mfspr r3,SPRN_HID4 rldimi r3,r0,40,23 /* clear bit 23 (rm_ci) */ sync mtspr SPRN_HID4,r3 isync sync slbia /* get TOC pointer (real address) */ bl .relative_toc /* Copy some CPU settings from CPU 0 */ bl .__restore_cpu_ppc970 /* pSeries do that early though I don't think we really need it */ mfmsr r3 ori r3,r3,MSR_RI mtmsrd r3 /* RI on */ /* Set up a paca value for this processor. */ LOAD_REG_ADDR(r4,paca) /* Get base vaddr of paca array */ mulli r13,r24,PACA_SIZE /* Calculate vaddr of right paca */ add r13,r13,r4 /* for this processor. */ mtspr SPRN_SPRG3,r13 /* Save vaddr of paca in SPRG3 */ /* Create a temp kernel stack for use before relocation is on. */ ld r1,PACAEMERGSP(r13) subi r1,r1,STACK_FRAME_OVERHEAD b __secondary_start #endif /* CONFIG_PPC_PMAC */ /* * This function is called after the master CPU has released the * secondary processors. The execution environment is relocation off. * The paca for this processor has the following fields initialized at * this point: * 1. Processor number * 2. Segment table pointer (virtual address) * On entry the following are set: * r1 = stack pointer. vaddr for iSeries, raddr (temp stack) for pSeries * r24 = cpu# (in Linux terms) * r13 = paca virtual address * SPRG3 = paca virtual address */ .globl __secondary_start __secondary_start: /* Set thread priority to MEDIUM */ HMT_MEDIUM /* Do early setup for that CPU (stab, slb, hash table pointer) */ bl .early_setup_secondary /* Initialize the kernel stack. Just a repeat for iSeries. */ LOAD_REG_ADDR(r3, current_set) sldi r28,r24,3 /* get current_set[cpu#] */ ldx r1,r3,r28 addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD std r1,PACAKSAVE(r13) /* Clear backchain so we get nice backtraces */ li r7,0 mtlr r7 /* enable MMU and jump to start_secondary */ LOAD_REG_ADDR(r3, .start_secondary_prolog) LOAD_REG_IMMEDIATE(r4, MSR_KERNEL) #ifdef CONFIG_PPC_ISERIES BEGIN_FW_FTR_SECTION ori r4,r4,MSR_EE li r8,1 stb r8,PACAHARDIRQEN(r13) END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) #endif BEGIN_FW_FTR_SECTION stb r7,PACAHARDIRQEN(r13) END_FW_FTR_SECTION_IFCLR(FW_FEATURE_ISERIES) stb r7,PACASOFTIRQEN(r13) mtspr SPRN_SRR0,r3 mtspr SPRN_SRR1,r4 rfid b . /* prevent speculative execution */ /* * Running with relocation on at this point. All we want to do is * zero the stack back-chain pointer and get the TOC virtual address * before going into C code. */ _GLOBAL(start_secondary_prolog) ld r2,PACATOC(r13) li r3,0 std r3,0(r1) /* Zero the stack frame pointer */ bl .start_secondary b . #endif /* * This subroutine clobbers r11 and r12 */ _GLOBAL(enable_64b_mode) mfmsr r11 /* grab the current MSR */ li r12,(MSR_SF | MSR_ISF)@highest sldi r12,r12,48 or r11,r11,r12 mtmsrd r11 isync blr /* * This puts the TOC pointer into r2, offset by 0x8000 (as expected * by the toolchain). It computes the correct value for wherever we * are running at the moment, using position-independent code. */ _GLOBAL(relative_toc) mflr r0 bcl 20,31,$+4 0: mflr r9 ld r2,(p_toc - 0b)(r9) add r2,r2,r9 mtlr r0 blr p_toc: .llong __toc_start + 0x8000 - 0b /* * This is where the main kernel code starts. */ _INIT_STATIC(start_here_multiplatform) /* set up the TOC (real address) */ bl .relative_toc /* Clear out the BSS. It may have been done in prom_init, * already but that's irrelevant since prom_init will soon * be detached from the kernel completely. Besides, we need * to clear it now for kexec-style entry. */ LOAD_REG_ADDR(r11,__bss_stop) LOAD_REG_ADDR(r8,__bss_start) sub r11,r11,r8 /* bss size */ addi r11,r11,7 /* round up to an even double word */ srdi. r11,r11,3 /* shift right by 3 */ beq 4f addi r8,r8,-8 li r0,0 mtctr r11 /* zero this many doublewords */ 3: stdu r0,8(r8) bdnz 3b 4: mfmsr r6 ori r6,r6,MSR_RI mtmsrd r6 /* RI on */ #ifdef CONFIG_RELOCATABLE /* Save the physical address we're running at in kernstart_addr */ LOAD_REG_ADDR(r4, kernstart_addr) clrldi r0,r25,2 std r0,0(r4) #endif /* The following gets the stack set up with the regs */ /* pointing to the real addr of the kernel stack. This is */ /* all done to support the C function call below which sets */ /* up the htab. This is done because we have relocated the */ /* kernel but are still running in real mode. */ LOAD_REG_ADDR(r3,init_thread_union) /* set up a stack pointer */ addi r1,r3,THREAD_SIZE li r0,0 stdu r0,-STACK_FRAME_OVERHEAD(r1) /* Do very early kernel initializations, including initial hash table, * stab and slb setup before we turn on relocation. */ /* Restore parameters passed from prom_init/kexec */ mr r3,r31 bl .early_setup /* also sets r13 and SPRG3 */ LOAD_REG_ADDR(r3, .start_here_common) ld r4,PACAKMSR(r13) mtspr SPRN_SRR0,r3 mtspr SPRN_SRR1,r4 rfid b . /* prevent speculative execution */ /* This is where all platforms converge execution */ _INIT_GLOBAL(start_here_common) /* relocation is on at this point */ std r1,PACAKSAVE(r13) /* Load the TOC (virtual address) */ ld r2,PACATOC(r13) bl .setup_system /* Load up the kernel context */ 5: li r5,0 stb r5,PACASOFTIRQEN(r13) /* Soft Disabled */ #ifdef CONFIG_PPC_ISERIES BEGIN_FW_FTR_SECTION mfmsr r5 ori r5,r5,MSR_EE /* Hard Enabled on iSeries*/ mtmsrd r5 li r5,1 END_FW_FTR_SECTION_IFSET(FW_FEATURE_ISERIES) #endif stb r5,PACAHARDIRQEN(r13) /* Hard Disabled on others */ bl .start_kernel /* Not reached */ BUG_OPCODE /* * We put a few things here that have to be page-aligned. * This stuff goes at the beginning of the bss, which is page-aligned. */ .section ".bss" .align PAGE_SHIFT .globl empty_zero_page empty_zero_page: .space PAGE_SIZE .globl swapper_pg_dir swapper_pg_dir: .space PGD_TABLE_SIZE