| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * 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. |
| * MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@jlc.net). |
| * |
| * This file contains the low-level support and setup for the |
| * PowerPC platform, including trap and interrupt dispatch. |
| * (The PPC 8xx embedded CPUs use head_8xx.S instead.) |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/pgtable.h> |
| #include <asm/reg.h> |
| #include <asm/page.h> |
| #include <asm/mmu.h> |
| #include <asm/cputable.h> |
| #include <asm/cache.h> |
| #include <asm/thread_info.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/ptrace.h> |
| #include <asm/bug.h> |
| #include <asm/kvm_book3s_asm.h> |
| #include <asm/export.h> |
| #include <asm/feature-fixups.h> |
| #include <asm/interrupt.h> |
| |
| #include "head_32.h" |
| |
| #define LOAD_BAT(n, reg, RA, RB) \ |
| /* see the comment for clear_bats() -- Cort */ \ |
| li RA,0; \ |
| mtspr SPRN_IBAT##n##U,RA; \ |
| mtspr SPRN_DBAT##n##U,RA; \ |
| lwz RA,(n*16)+0(reg); \ |
| lwz RB,(n*16)+4(reg); \ |
| mtspr SPRN_IBAT##n##U,RA; \ |
| mtspr SPRN_IBAT##n##L,RB; \ |
| lwz RA,(n*16)+8(reg); \ |
| lwz RB,(n*16)+12(reg); \ |
| mtspr SPRN_DBAT##n##U,RA; \ |
| mtspr SPRN_DBAT##n##L,RB |
| |
| __HEAD |
| .stabs "arch/powerpc/kernel/",N_SO,0,0,0f |
| .stabs "head_book3s_32.S",N_SO,0,0,0f |
| 0: |
| _ENTRY(_stext); |
| |
| /* |
| * _start is defined this way because the XCOFF loader in the OpenFirmware |
| * on the powermac expects the entry point to be a procedure descriptor. |
| */ |
| _ENTRY(_start); |
| /* |
| * These are here for legacy reasons, the kernel used to |
| * need to look like a coff function entry for the pmac |
| * but we're always started by some kind of bootloader now. |
| * -- Cort |
| */ |
| nop /* used by __secondary_hold on prep (mtx) and chrp smp */ |
| nop /* used by __secondary_hold on prep (mtx) and chrp smp */ |
| nop |
| |
| /* PMAC |
| * Enter here with the kernel text, data and bss loaded starting at |
| * 0, running with virtual == physical mapping. |
| * r5 points to the prom entry point (the client interface handler |
| * address). Address translation is turned on, with the prom |
| * managing the hash table. Interrupts are disabled. The stack |
| * pointer (r1) points to just below the end of the half-meg region |
| * from 0x380000 - 0x400000, which is mapped in already. |
| * |
| * If we are booted from MacOS via BootX, we enter with the kernel |
| * image loaded somewhere, and the following values in registers: |
| * r3: 'BooX' (0x426f6f58) |
| * r4: virtual address of boot_infos_t |
| * r5: 0 |
| * |
| * PREP |
| * This is jumped to on prep systems right after the kernel is relocated |
| * to its proper place in memory by the boot loader. The expected layout |
| * of the regs is: |
| * r3: ptr to residual data |
| * r4: initrd_start or if no initrd then 0 |
| * r5: initrd_end - unused if r4 is 0 |
| * r6: Start of command line string |
| * r7: End of command line string |
| * |
| * This just gets a minimal mmu environment setup so we can call |
| * start_here() to do the real work. |
| * -- Cort |
| */ |
| |
| .globl __start |
| __start: |
| /* |
| * We have to do any OF calls before we map ourselves to KERNELBASE, |
| * because OF may have I/O devices mapped into that area |
| * (particularly on CHRP). |
| */ |
| cmpwi 0,r5,0 |
| beq 1f |
| |
| #ifdef CONFIG_PPC_OF_BOOT_TRAMPOLINE |
| /* find out where we are now */ |
| bcl 20,31,$+4 |
| 0: mflr r8 /* r8 = runtime addr here */ |
| addis r8,r8,(_stext - 0b)@ha |
| addi r8,r8,(_stext - 0b)@l /* current runtime base addr */ |
| 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 |
| |
| /* |
| * Check for BootX signature when supporting PowerMac and branch to |
| * appropriate trampoline if it's present |
| */ |
| #ifdef CONFIG_PPC_PMAC |
| 1: lis r31,0x426f |
| ori r31,r31,0x6f58 |
| cmpw 0,r3,r31 |
| bne 1f |
| bl bootx_init |
| trap |
| #endif /* CONFIG_PPC_PMAC */ |
| |
| 1: mr r31,r3 /* save device tree ptr */ |
| li r24,0 /* cpu # */ |
| |
| /* |
| * early_init() does the early machine identification and does |
| * the necessary low-level setup and clears the BSS |
| * -- Cort <cort@fsmlabs.com> |
| */ |
| bl early_init |
| |
| /* Switch MMU off, clear BATs and flush TLB. At this point, r3 contains |
| * the physical address we are running at, returned by early_init() |
| */ |
| bl mmu_off |
| __after_mmu_off: |
| bl clear_bats |
| bl flush_tlbs |
| |
| bl initial_bats |
| bl load_segment_registers |
| bl reloc_offset |
| bl early_hash_table |
| #if defined(CONFIG_BOOTX_TEXT) |
| bl setup_disp_bat |
| #endif |
| #ifdef CONFIG_PPC_EARLY_DEBUG_CPM |
| bl setup_cpm_bat |
| #endif |
| #ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO |
| bl setup_usbgecko_bat |
| #endif |
| |
| /* |
| * Call setup_cpu for CPU 0 and initialize 6xx Idle |
| */ |
| bl reloc_offset |
| li r24,0 /* cpu# */ |
| bl call_setup_cpu /* Call setup_cpu for this CPU */ |
| bl reloc_offset |
| bl init_idle_6xx |
| |
| |
| /* |
| * We need to run with _start at physical address 0. |
| * On CHRP, we are loaded at 0x10000 since OF on CHRP uses |
| * the exception vectors at 0 (and therefore this copy |
| * overwrites OF's exception vectors with our own). |
| * The MMU is off at this point. |
| */ |
| bl reloc_offset |
| mr r26,r3 |
| addis r4,r3,KERNELBASE@h /* current address of _start */ |
| lis r5,PHYSICAL_START@h |
| cmplw 0,r4,r5 /* already running at PHYSICAL_START? */ |
| bne relocate_kernel |
| /* |
| * we now have the 1st 16M of ram mapped with the bats. |
| * prep needs the mmu to be turned on here, but pmac already has it on. |
| * this shouldn't bother the pmac since it just gets turned on again |
| * as we jump to our code at KERNELBASE. -- Cort |
| * Actually no, pmac doesn't have it on any more. BootX enters with MMU |
| * off, and in other cases, we now turn it off before changing BATs above. |
| */ |
| turn_on_mmu: |
| mfmsr r0 |
| ori r0,r0,MSR_DR|MSR_IR|MSR_RI |
| mtspr SPRN_SRR1,r0 |
| lis r0,start_here@h |
| ori r0,r0,start_here@l |
| mtspr SPRN_SRR0,r0 |
| rfi /* enables MMU */ |
| |
| /* |
| * We need __secondary_hold as a place to hold the other cpus on |
| * an SMP machine, even when we are running a UP kernel. |
| */ |
| . = 0xc0 /* for prep bootloader */ |
| li r3,1 /* MTX only has 1 cpu */ |
| .globl __secondary_hold |
| __secondary_hold: |
| /* tell the master we're here */ |
| stw r3,__secondary_hold_acknowledge@l(0) |
| #ifdef CONFIG_SMP |
| 100: lwz r4,0(0) |
| /* wait until we're told to start */ |
| cmpw 0,r4,r3 |
| bne 100b |
| /* our cpu # was at addr 0 - go */ |
| mr r24,r3 /* cpu # */ |
| b __secondary_start |
| #else |
| b . |
| #endif /* CONFIG_SMP */ |
| |
| .globl __secondary_hold_spinloop |
| __secondary_hold_spinloop: |
| .long 0 |
| .globl __secondary_hold_acknowledge |
| __secondary_hold_acknowledge: |
| .long -1 |
| |
| /* System reset */ |
| /* core99 pmac starts the seconary here by changing the vector, and |
| putting it back to what it was (unknown_async_exception) when done. */ |
| EXCEPTION(INTERRUPT_SYSTEM_RESET, Reset, unknown_async_exception) |
| |
| /* Machine check */ |
| /* |
| * On CHRP, this is complicated by the fact that we could get a |
| * machine check inside RTAS, and we have no guarantee that certain |
| * critical registers will have the values we expect. The set of |
| * registers that might have bad values includes all the GPRs |
| * and all the BATs. We indicate that we are in RTAS by putting |
| * a non-zero value, the address of the exception frame to use, |
| * in thread.rtas_sp. The machine check handler checks thread.rtas_sp |
| * and uses its value if it is non-zero. |
| * (Other exception handlers assume that r1 is a valid kernel stack |
| * pointer when we take an exception from supervisor mode.) |
| * -- paulus. |
| */ |
| START_EXCEPTION(INTERRUPT_MACHINE_CHECK, MachineCheck) |
| EXCEPTION_PROLOG_0 |
| #ifdef CONFIG_PPC_CHRP |
| mtspr SPRN_SPRG_SCRATCH2,r1 |
| mfspr r1, SPRN_SPRG_THREAD |
| lwz r1, RTAS_SP(r1) |
| cmpwi cr1, r1, 0 |
| bne cr1, 7f |
| mfspr r1, SPRN_SPRG_SCRATCH2 |
| #endif /* CONFIG_PPC_CHRP */ |
| EXCEPTION_PROLOG_1 |
| 7: EXCEPTION_PROLOG_2 0x200 MachineCheck |
| #ifdef CONFIG_PPC_CHRP |
| beq cr1, 1f |
| twi 31, 0, 0 |
| #endif |
| 1: prepare_transfer_to_handler |
| bl machine_check_exception |
| b interrupt_return |
| |
| /* Data access exception. */ |
| START_EXCEPTION(INTERRUPT_DATA_STORAGE, DataAccess) |
| #ifdef CONFIG_PPC_BOOK3S_604 |
| BEGIN_MMU_FTR_SECTION |
| mtspr SPRN_SPRG_SCRATCH2,r10 |
| mfspr r10, SPRN_SPRG_THREAD |
| stw r11, THR11(r10) |
| mfspr r10, SPRN_DSISR |
| mfcr r11 |
| andis. r10, r10, (DSISR_BAD_FAULT_32S | DSISR_DABRMATCH)@h |
| mfspr r10, SPRN_SPRG_THREAD |
| beq hash_page_dsi |
| .Lhash_page_dsi_cont: |
| mtcr r11 |
| lwz r11, THR11(r10) |
| mfspr r10, SPRN_SPRG_SCRATCH2 |
| MMU_FTR_SECTION_ELSE |
| b 1f |
| ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE) |
| #endif |
| 1: EXCEPTION_PROLOG_0 handle_dar_dsisr=1 |
| EXCEPTION_PROLOG_1 |
| EXCEPTION_PROLOG_2 INTERRUPT_DATA_STORAGE DataAccess handle_dar_dsisr=1 |
| prepare_transfer_to_handler |
| lwz r5, _DSISR(r1) |
| andis. r0, r5, DSISR_DABRMATCH@h |
| bne- 1f |
| bl do_page_fault |
| b interrupt_return |
| 1: bl do_break |
| REST_NVGPRS(r1) |
| b interrupt_return |
| |
| |
| /* Instruction access exception. */ |
| START_EXCEPTION(INTERRUPT_INST_STORAGE, InstructionAccess) |
| mtspr SPRN_SPRG_SCRATCH0,r10 |
| mtspr SPRN_SPRG_SCRATCH1,r11 |
| mfspr r10, SPRN_SPRG_THREAD |
| mfspr r11, SPRN_SRR0 |
| stw r11, SRR0(r10) |
| mfspr r11, SPRN_SRR1 /* check whether user or kernel */ |
| stw r11, SRR1(r10) |
| mfcr r10 |
| #ifdef CONFIG_PPC_BOOK3S_604 |
| BEGIN_MMU_FTR_SECTION |
| andis. r11, r11, SRR1_ISI_NOPT@h /* no pte found? */ |
| bne hash_page_isi |
| .Lhash_page_isi_cont: |
| mfspr r11, SPRN_SRR1 /* check whether user or kernel */ |
| END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) |
| #endif |
| andi. r11, r11, MSR_PR |
| |
| EXCEPTION_PROLOG_1 |
| EXCEPTION_PROLOG_2 INTERRUPT_INST_STORAGE InstructionAccess |
| andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */ |
| stw r5, _DSISR(r11) |
| stw r12, _DAR(r11) |
| prepare_transfer_to_handler |
| bl do_page_fault |
| b interrupt_return |
| |
| /* External interrupt */ |
| EXCEPTION(INTERRUPT_EXTERNAL, HardwareInterrupt, do_IRQ) |
| |
| /* Alignment exception */ |
| START_EXCEPTION(INTERRUPT_ALIGNMENT, Alignment) |
| EXCEPTION_PROLOG INTERRUPT_ALIGNMENT Alignment handle_dar_dsisr=1 |
| prepare_transfer_to_handler |
| bl alignment_exception |
| REST_NVGPRS(r1) |
| b interrupt_return |
| |
| /* Program check exception */ |
| START_EXCEPTION(INTERRUPT_PROGRAM, ProgramCheck) |
| EXCEPTION_PROLOG INTERRUPT_PROGRAM ProgramCheck |
| prepare_transfer_to_handler |
| bl program_check_exception |
| REST_NVGPRS(r1) |
| b interrupt_return |
| |
| /* Floating-point unavailable */ |
| START_EXCEPTION(0x800, FPUnavailable) |
| #ifdef CONFIG_PPC_FPU |
| BEGIN_FTR_SECTION |
| /* |
| * Certain Freescale cores don't have a FPU and treat fp instructions |
| * as a FP Unavailable exception. Redirect to illegal/emulation handling. |
| */ |
| b ProgramCheck |
| END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE) |
| EXCEPTION_PROLOG INTERRUPT_FP_UNAVAIL FPUnavailable |
| beq 1f |
| bl load_up_fpu /* if from user, just load it up */ |
| b fast_exception_return |
| 1: prepare_transfer_to_handler |
| bl kernel_fp_unavailable_exception |
| b interrupt_return |
| #else |
| b ProgramCheck |
| #endif |
| |
| /* Decrementer */ |
| EXCEPTION(INTERRUPT_DECREMENTER, Decrementer, timer_interrupt) |
| |
| EXCEPTION(0xa00, Trap_0a, unknown_exception) |
| EXCEPTION(0xb00, Trap_0b, unknown_exception) |
| |
| /* System call */ |
| START_EXCEPTION(INTERRUPT_SYSCALL, SystemCall) |
| SYSCALL_ENTRY INTERRUPT_SYSCALL |
| |
| EXCEPTION(INTERRUPT_TRACE, SingleStep, single_step_exception) |
| EXCEPTION(0xe00, Trap_0e, unknown_exception) |
| |
| /* |
| * The Altivec unavailable trap is at 0x0f20. Foo. |
| * We effectively remap it to 0x3000. |
| * We include an altivec unavailable exception vector even if |
| * not configured for Altivec, so that you can't panic a |
| * non-altivec kernel running on a machine with altivec just |
| * by executing an altivec instruction. |
| */ |
| START_EXCEPTION(INTERRUPT_PERFMON, PerformanceMonitorTrap) |
| b PerformanceMonitor |
| |
| START_EXCEPTION(INTERRUPT_ALTIVEC_UNAVAIL, AltiVecUnavailableTrap) |
| b AltiVecUnavailable |
| |
| __HEAD |
| /* |
| * Handle TLB miss for instruction on 603/603e. |
| * Note: we get an alternate set of r0 - r3 to use automatically. |
| */ |
| . = INTERRUPT_INST_TLB_MISS_603 |
| InstructionTLBMiss: |
| /* |
| * r0: scratch |
| * r1: linux style pte ( later becomes ppc hardware pte ) |
| * r2: ptr to linux-style pte |
| * r3: scratch |
| */ |
| /* Get PTE (linux-style) and check access */ |
| mfspr r3,SPRN_IMISS |
| #ifdef CONFIG_MODULES |
| lis r1, TASK_SIZE@h /* check if kernel address */ |
| cmplw 0,r1,r3 |
| #endif |
| mfspr r2, SPRN_SDR1 |
| li r1,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC | _PAGE_USER |
| rlwinm r2, r2, 28, 0xfffff000 |
| #ifdef CONFIG_MODULES |
| bgt- 112f |
| lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ |
| li r1,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC |
| addi r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ |
| #endif |
| 112: rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */ |
| lwz r2,0(r2) /* get pmd entry */ |
| rlwinm. r2,r2,0,0,19 /* extract address of pte page */ |
| beq- InstructionAddressInvalid /* return if no mapping */ |
| rlwimi r2,r3,22,20,29 /* insert next 10 bits of address */ |
| lwz r0,0(r2) /* get linux-style pte */ |
| andc. r1,r1,r0 /* check access & ~permission */ |
| bne- InstructionAddressInvalid /* return if access not permitted */ |
| /* Convert linux-style PTE to low word of PPC-style PTE */ |
| rlwimi r0,r0,32-2,31,31 /* _PAGE_USER -> PP lsb */ |
| ori r1, r1, 0xe06 /* clear out reserved bits */ |
| andc r1, r0, r1 /* PP = user? 1 : 0 */ |
| BEGIN_FTR_SECTION |
| rlwinm r1,r1,0,~_PAGE_COHERENT /* clear M (coherence not required) */ |
| END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT) |
| mtspr SPRN_RPA,r1 |
| tlbli r3 |
| mfspr r3,SPRN_SRR1 /* Need to restore CR0 */ |
| mtcrf 0x80,r3 |
| rfi |
| InstructionAddressInvalid: |
| mfspr r3,SPRN_SRR1 |
| rlwinm r1,r3,9,6,6 /* Get load/store bit */ |
| |
| addis r1,r1,0x2000 |
| mtspr SPRN_DSISR,r1 /* (shouldn't be needed) */ |
| andi. r2,r3,0xFFFF /* Clear upper bits of SRR1 */ |
| or r2,r2,r1 |
| mtspr SPRN_SRR1,r2 |
| mfspr r1,SPRN_IMISS /* Get failing address */ |
| rlwinm. r2,r2,0,31,31 /* Check for little endian access */ |
| rlwimi r2,r2,1,30,30 /* change 1 -> 3 */ |
| xor r1,r1,r2 |
| mtspr SPRN_DAR,r1 /* Set fault address */ |
| mfmsr r0 /* Restore "normal" registers */ |
| xoris r0,r0,MSR_TGPR>>16 |
| mtcrf 0x80,r3 /* Restore CR0 */ |
| mtmsr r0 |
| b InstructionAccess |
| |
| /* |
| * Handle TLB miss for DATA Load operation on 603/603e |
| */ |
| . = INTERRUPT_DATA_LOAD_TLB_MISS_603 |
| DataLoadTLBMiss: |
| /* |
| * r0: scratch |
| * r1: linux style pte ( later becomes ppc hardware pte ) |
| * r2: ptr to linux-style pte |
| * r3: scratch |
| */ |
| /* Get PTE (linux-style) and check access */ |
| mfspr r3,SPRN_DMISS |
| lis r1, TASK_SIZE@h /* check if kernel address */ |
| cmplw 0,r1,r3 |
| mfspr r2, SPRN_SDR1 |
| li r1, _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_USER |
| rlwinm r2, r2, 28, 0xfffff000 |
| bgt- 112f |
| lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ |
| li r1, _PAGE_PRESENT | _PAGE_ACCESSED |
| addi r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ |
| 112: rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */ |
| lwz r2,0(r2) /* get pmd entry */ |
| rlwinm. r2,r2,0,0,19 /* extract address of pte page */ |
| beq- DataAddressInvalid /* return if no mapping */ |
| rlwimi r2,r3,22,20,29 /* insert next 10 bits of address */ |
| lwz r0,0(r2) /* get linux-style pte */ |
| andc. r1,r1,r0 /* check access & ~permission */ |
| bne- DataAddressInvalid /* return if access not permitted */ |
| /* |
| * NOTE! We are assuming this is not an SMP system, otherwise |
| * we would need to update the pte atomically with lwarx/stwcx. |
| */ |
| /* Convert linux-style PTE to low word of PPC-style PTE */ |
| rlwinm r1,r0,32-9,30,30 /* _PAGE_RW -> PP msb */ |
| rlwimi r0,r0,32-1,30,30 /* _PAGE_USER -> PP msb */ |
| rlwimi r0,r0,32-1,31,31 /* _PAGE_USER -> PP lsb */ |
| ori r1,r1,0xe04 /* clear out reserved bits */ |
| andc r1,r0,r1 /* PP = user? rw? 1: 3: 0 */ |
| BEGIN_FTR_SECTION |
| rlwinm r1,r1,0,~_PAGE_COHERENT /* clear M (coherence not required) */ |
| END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT) |
| mtspr SPRN_RPA,r1 |
| BEGIN_MMU_FTR_SECTION |
| li r0,1 |
| mfspr r1,SPRN_SPRG_603_LRU |
| rlwinm r2,r3,20,27,31 /* Get Address bits 15:19 */ |
| slw r0,r0,r2 |
| xor r1,r0,r1 |
| srw r0,r1,r2 |
| mtspr SPRN_SPRG_603_LRU,r1 |
| mfspr r2,SPRN_SRR1 |
| rlwimi r2,r0,31-14,14,14 |
| mtspr SPRN_SRR1,r2 |
| mtcrf 0x80,r2 |
| tlbld r3 |
| rfi |
| MMU_FTR_SECTION_ELSE |
| mfspr r2,SPRN_SRR1 /* Need to restore CR0 */ |
| mtcrf 0x80,r2 |
| tlbld r3 |
| rfi |
| ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_NEED_DTLB_SW_LRU) |
| DataAddressInvalid: |
| mfspr r3,SPRN_SRR1 |
| rlwinm r1,r3,9,6,6 /* Get load/store bit */ |
| addis r1,r1,0x2000 |
| mtspr SPRN_DSISR,r1 |
| andi. r2,r3,0xFFFF /* Clear upper bits of SRR1 */ |
| mtspr SPRN_SRR1,r2 |
| mfspr r1,SPRN_DMISS /* Get failing address */ |
| rlwinm. r2,r2,0,31,31 /* Check for little endian access */ |
| beq 20f /* Jump if big endian */ |
| xori r1,r1,3 |
| 20: mtspr SPRN_DAR,r1 /* Set fault address */ |
| mfmsr r0 /* Restore "normal" registers */ |
| xoris r0,r0,MSR_TGPR>>16 |
| mtcrf 0x80,r3 /* Restore CR0 */ |
| mtmsr r0 |
| b DataAccess |
| |
| /* |
| * Handle TLB miss for DATA Store on 603/603e |
| */ |
| . = INTERRUPT_DATA_STORE_TLB_MISS_603 |
| DataStoreTLBMiss: |
| /* |
| * r0: scratch |
| * r1: linux style pte ( later becomes ppc hardware pte ) |
| * r2: ptr to linux-style pte |
| * r3: scratch |
| */ |
| /* Get PTE (linux-style) and check access */ |
| mfspr r3,SPRN_DMISS |
| lis r1, TASK_SIZE@h /* check if kernel address */ |
| cmplw 0,r1,r3 |
| mfspr r2, SPRN_SDR1 |
| li r1, _PAGE_RW | _PAGE_DIRTY | _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_USER |
| rlwinm r2, r2, 28, 0xfffff000 |
| bgt- 112f |
| lis r2, (swapper_pg_dir - PAGE_OFFSET)@ha /* if kernel address, use */ |
| li r1, _PAGE_RW | _PAGE_DIRTY | _PAGE_PRESENT | _PAGE_ACCESSED |
| addi r2, r2, (swapper_pg_dir - PAGE_OFFSET)@l /* kernel page table */ |
| 112: rlwimi r2,r3,12,20,29 /* insert top 10 bits of address */ |
| lwz r2,0(r2) /* get pmd entry */ |
| rlwinm. r2,r2,0,0,19 /* extract address of pte page */ |
| beq- DataAddressInvalid /* return if no mapping */ |
| rlwimi r2,r3,22,20,29 /* insert next 10 bits of address */ |
| lwz r0,0(r2) /* get linux-style pte */ |
| andc. r1,r1,r0 /* check access & ~permission */ |
| bne- DataAddressInvalid /* return if access not permitted */ |
| /* |
| * NOTE! We are assuming this is not an SMP system, otherwise |
| * we would need to update the pte atomically with lwarx/stwcx. |
| */ |
| /* Convert linux-style PTE to low word of PPC-style PTE */ |
| rlwimi r0,r0,32-2,31,31 /* _PAGE_USER -> PP lsb */ |
| li r1,0xe06 /* clear out reserved bits & PP msb */ |
| andc r1,r0,r1 /* PP = user? 1: 0 */ |
| BEGIN_FTR_SECTION |
| rlwinm r1,r1,0,~_PAGE_COHERENT /* clear M (coherence not required) */ |
| END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT) |
| mtspr SPRN_RPA,r1 |
| mfspr r2,SPRN_SRR1 /* Need to restore CR0 */ |
| mtcrf 0x80,r2 |
| BEGIN_MMU_FTR_SECTION |
| li r0,1 |
| mfspr r1,SPRN_SPRG_603_LRU |
| rlwinm r2,r3,20,27,31 /* Get Address bits 15:19 */ |
| slw r0,r0,r2 |
| xor r1,r0,r1 |
| srw r0,r1,r2 |
| mtspr SPRN_SPRG_603_LRU,r1 |
| mfspr r2,SPRN_SRR1 |
| rlwimi r2,r0,31-14,14,14 |
| mtspr SPRN_SRR1,r2 |
| mtcrf 0x80,r2 |
| tlbld r3 |
| rfi |
| MMU_FTR_SECTION_ELSE |
| mfspr r2,SPRN_SRR1 /* Need to restore CR0 */ |
| mtcrf 0x80,r2 |
| tlbld r3 |
| rfi |
| ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_NEED_DTLB_SW_LRU) |
| |
| #ifndef CONFIG_ALTIVEC |
| #define altivec_assist_exception unknown_exception |
| #endif |
| |
| #ifndef CONFIG_TAU_INT |
| #define TAUException unknown_async_exception |
| #endif |
| |
| EXCEPTION(0x1300, Trap_13, instruction_breakpoint_exception) |
| EXCEPTION(0x1400, SMI, SMIException) |
| EXCEPTION(0x1500, Trap_15, unknown_exception) |
| EXCEPTION(0x1600, Trap_16, altivec_assist_exception) |
| EXCEPTION(0x1700, Trap_17, TAUException) |
| EXCEPTION(0x1800, Trap_18, unknown_exception) |
| EXCEPTION(0x1900, Trap_19, unknown_exception) |
| EXCEPTION(0x1a00, Trap_1a, unknown_exception) |
| EXCEPTION(0x1b00, Trap_1b, unknown_exception) |
| EXCEPTION(0x1c00, Trap_1c, unknown_exception) |
| EXCEPTION(0x1d00, Trap_1d, unknown_exception) |
| EXCEPTION(0x1e00, Trap_1e, unknown_exception) |
| EXCEPTION(0x1f00, Trap_1f, unknown_exception) |
| EXCEPTION(0x2000, RunMode, RunModeException) |
| EXCEPTION(0x2100, Trap_21, unknown_exception) |
| EXCEPTION(0x2200, Trap_22, unknown_exception) |
| EXCEPTION(0x2300, Trap_23, unknown_exception) |
| EXCEPTION(0x2400, Trap_24, unknown_exception) |
| EXCEPTION(0x2500, Trap_25, unknown_exception) |
| EXCEPTION(0x2600, Trap_26, unknown_exception) |
| EXCEPTION(0x2700, Trap_27, unknown_exception) |
| EXCEPTION(0x2800, Trap_28, unknown_exception) |
| EXCEPTION(0x2900, Trap_29, unknown_exception) |
| EXCEPTION(0x2a00, Trap_2a, unknown_exception) |
| EXCEPTION(0x2b00, Trap_2b, unknown_exception) |
| EXCEPTION(0x2c00, Trap_2c, unknown_exception) |
| EXCEPTION(0x2d00, Trap_2d, unknown_exception) |
| EXCEPTION(0x2e00, Trap_2e, unknown_exception) |
| EXCEPTION(0x2f00, Trap_2f, unknown_exception) |
| |
| __HEAD |
| . = 0x3000 |
| |
| #ifdef CONFIG_PPC_BOOK3S_604 |
| .macro save_regs_thread thread |
| stw r0, THR0(\thread) |
| stw r3, THR3(\thread) |
| stw r4, THR4(\thread) |
| stw r5, THR5(\thread) |
| stw r6, THR6(\thread) |
| stw r8, THR8(\thread) |
| stw r9, THR9(\thread) |
| mflr r0 |
| stw r0, THLR(\thread) |
| mfctr r0 |
| stw r0, THCTR(\thread) |
| .endm |
| |
| .macro restore_regs_thread thread |
| lwz r0, THLR(\thread) |
| mtlr r0 |
| lwz r0, THCTR(\thread) |
| mtctr r0 |
| lwz r0, THR0(\thread) |
| lwz r3, THR3(\thread) |
| lwz r4, THR4(\thread) |
| lwz r5, THR5(\thread) |
| lwz r6, THR6(\thread) |
| lwz r8, THR8(\thread) |
| lwz r9, THR9(\thread) |
| .endm |
| |
| hash_page_dsi: |
| save_regs_thread r10 |
| mfdsisr r3 |
| mfdar r4 |
| mfsrr0 r5 |
| mfsrr1 r9 |
| rlwinm r3, r3, 32 - 15, _PAGE_RW /* DSISR_STORE -> _PAGE_RW */ |
| bl hash_page |
| mfspr r10, SPRN_SPRG_THREAD |
| restore_regs_thread r10 |
| b .Lhash_page_dsi_cont |
| |
| hash_page_isi: |
| mr r11, r10 |
| mfspr r10, SPRN_SPRG_THREAD |
| save_regs_thread r10 |
| li r3, 0 |
| lwz r4, SRR0(r10) |
| lwz r9, SRR1(r10) |
| bl hash_page |
| mfspr r10, SPRN_SPRG_THREAD |
| restore_regs_thread r10 |
| mr r10, r11 |
| b .Lhash_page_isi_cont |
| |
| .globl fast_hash_page_return |
| fast_hash_page_return: |
| andis. r10, r9, SRR1_ISI_NOPT@h /* Set on ISI, cleared on DSI */ |
| mfspr r10, SPRN_SPRG_THREAD |
| restore_regs_thread r10 |
| bne 1f |
| |
| /* DSI */ |
| mtcr r11 |
| lwz r11, THR11(r10) |
| mfspr r10, SPRN_SPRG_SCRATCH2 |
| rfi |
| |
| 1: /* ISI */ |
| mtcr r11 |
| mfspr r11, SPRN_SPRG_SCRATCH1 |
| mfspr r10, SPRN_SPRG_SCRATCH0 |
| rfi |
| #endif /* CONFIG_PPC_BOOK3S_604 */ |
| |
| #ifdef CONFIG_VMAP_STACK |
| vmap_stack_overflow_exception |
| #endif |
| |
| __HEAD |
| AltiVecUnavailable: |
| EXCEPTION_PROLOG 0xf20 AltiVecUnavailable |
| #ifdef CONFIG_ALTIVEC |
| beq 1f |
| bl load_up_altivec /* if from user, just load it up */ |
| b fast_exception_return |
| #endif /* CONFIG_ALTIVEC */ |
| 1: prepare_transfer_to_handler |
| bl altivec_unavailable_exception |
| b interrupt_return |
| |
| __HEAD |
| PerformanceMonitor: |
| EXCEPTION_PROLOG 0xf00 PerformanceMonitor |
| prepare_transfer_to_handler |
| bl performance_monitor_exception |
| b interrupt_return |
| |
| |
| __HEAD |
| /* |
| * This code is jumped to from the startup code to copy |
| * the kernel image to physical address PHYSICAL_START. |
| */ |
| relocate_kernel: |
| lis r3,PHYSICAL_START@h /* Destination base address */ |
| li r6,0 /* Destination offset */ |
| li r5,0x4000 /* # bytes of memory to copy */ |
| bl copy_and_flush /* copy the first 0x4000 bytes */ |
| addi r0,r3,4f@l /* jump to the address of 4f */ |
| mtctr r0 /* in copy and do the rest. */ |
| bctr /* jump to the copy */ |
| 4: lis r5,_end-KERNELBASE@h |
| ori r5,r5,_end-KERNELBASE@l |
| bl copy_and_flush /* copy the rest */ |
| b turn_on_mmu |
| |
| /* |
| * 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. |
| */ |
| _ENTRY(copy_and_flush) |
| addi r5,r5,-4 |
| addi r6,r6,-4 |
| 4: li r0,L1_CACHE_BYTES/4 |
| mtctr r0 |
| 3: addi r6,r6,4 /* copy a cache line */ |
| lwzx r0,r6,r4 |
| stwx r0,r6,r3 |
| bdnz 3b |
| dcbst r6,r3 /* write it to memory */ |
| sync |
| icbi r6,r3 /* flush the icache line */ |
| cmplw 0,r6,r5 |
| blt 4b |
| sync /* additional sync needed on g4 */ |
| isync |
| addi r5,r5,4 |
| addi r6,r6,4 |
| blr |
| |
| #ifdef CONFIG_SMP |
| .globl __secondary_start_mpc86xx |
| __secondary_start_mpc86xx: |
| mfspr r3, SPRN_PIR |
| stw r3, __secondary_hold_acknowledge@l(0) |
| mr r24, r3 /* cpu # */ |
| b __secondary_start |
| |
| .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: |
| /* on powersurge, we come in here with IR=0 and DR=1, and DBAT 0 |
| set to map the 0xf0000000 - 0xffffffff region */ |
| mfmsr r0 |
| rlwinm r0,r0,0,28,26 /* clear DR (0x10) */ |
| mtmsr r0 |
| isync |
| |
| .globl __secondary_start |
| __secondary_start: |
| /* Copy some CPU settings from CPU 0 */ |
| bl __restore_cpu_setup |
| |
| lis r3,-KERNELBASE@h |
| mr r4,r24 |
| bl call_setup_cpu /* Call setup_cpu for this CPU */ |
| lis r3,-KERNELBASE@h |
| bl init_idle_6xx |
| |
| /* get current's stack and current */ |
| lis r2,secondary_current@ha |
| tophys(r2,r2) |
| lwz r2,secondary_current@l(r2) |
| tophys(r1,r2) |
| lwz r1,TASK_STACK(r1) |
| |
| /* stack */ |
| addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD |
| li r0,0 |
| tophys(r3,r1) |
| stw r0,0(r3) |
| |
| /* load up the MMU */ |
| bl load_segment_registers |
| bl load_up_mmu |
| |
| /* ptr to phys current thread */ |
| tophys(r4,r2) |
| addi r4,r4,THREAD /* phys address of our thread_struct */ |
| mtspr SPRN_SPRG_THREAD,r4 |
| BEGIN_MMU_FTR_SECTION |
| lis r4, (swapper_pg_dir - PAGE_OFFSET)@h |
| ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l |
| rlwinm r4, r4, 4, 0xffff01ff |
| mtspr SPRN_SDR1, r4 |
| END_MMU_FTR_SECTION_IFCLR(MMU_FTR_HPTE_TABLE) |
| |
| /* enable MMU and jump to start_secondary */ |
| li r4,MSR_KERNEL |
| lis r3,start_secondary@h |
| ori r3,r3,start_secondary@l |
| mtspr SPRN_SRR0,r3 |
| mtspr SPRN_SRR1,r4 |
| rfi |
| #endif /* CONFIG_SMP */ |
| |
| #ifdef CONFIG_KVM_BOOK3S_HANDLER |
| #include "../kvm/book3s_rmhandlers.S" |
| #endif |
| |
| /* |
| * Load stuff into the MMU. Intended to be called with |
| * IR=0 and DR=0. |
| */ |
| early_hash_table: |
| sync /* Force all PTE updates to finish */ |
| isync |
| tlbia /* Clear all TLB entries */ |
| sync /* wait for tlbia/tlbie to finish */ |
| TLBSYNC /* ... on all CPUs */ |
| /* Load the SDR1 register (hash table base & size) */ |
| lis r6, early_hash - PAGE_OFFSET@h |
| ori r6, r6, 3 /* 256kB table */ |
| mtspr SPRN_SDR1, r6 |
| blr |
| |
| load_up_mmu: |
| sync /* Force all PTE updates to finish */ |
| isync |
| tlbia /* Clear all TLB entries */ |
| sync /* wait for tlbia/tlbie to finish */ |
| TLBSYNC /* ... on all CPUs */ |
| BEGIN_MMU_FTR_SECTION |
| /* Load the SDR1 register (hash table base & size) */ |
| lis r6,_SDR1@ha |
| tophys(r6,r6) |
| lwz r6,_SDR1@l(r6) |
| mtspr SPRN_SDR1,r6 |
| END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) |
| |
| /* Load the BAT registers with the values set up by MMU_init. */ |
| lis r3,BATS@ha |
| addi r3,r3,BATS@l |
| tophys(r3,r3) |
| LOAD_BAT(0,r3,r4,r5) |
| LOAD_BAT(1,r3,r4,r5) |
| LOAD_BAT(2,r3,r4,r5) |
| LOAD_BAT(3,r3,r4,r5) |
| BEGIN_MMU_FTR_SECTION |
| LOAD_BAT(4,r3,r4,r5) |
| LOAD_BAT(5,r3,r4,r5) |
| LOAD_BAT(6,r3,r4,r5) |
| LOAD_BAT(7,r3,r4,r5) |
| END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) |
| blr |
| |
| _GLOBAL(load_segment_registers) |
| li r0, NUM_USER_SEGMENTS /* load up user segment register values */ |
| mtctr r0 /* for context 0 */ |
| li r3, 0 /* Kp = 0, Ks = 0, VSID = 0 */ |
| li r4, 0 |
| 3: mtsrin r3, r4 |
| addi r3, r3, 0x111 /* increment VSID */ |
| addis r4, r4, 0x1000 /* address of next segment */ |
| bdnz 3b |
| li r0, 16 - NUM_USER_SEGMENTS /* load up kernel segment registers */ |
| mtctr r0 /* for context 0 */ |
| rlwinm r3, r3, 0, ~SR_NX /* Nx = 0 */ |
| rlwinm r3, r3, 0, ~SR_KS /* Ks = 0 */ |
| oris r3, r3, SR_KP@h /* Kp = 1 */ |
| 3: mtsrin r3, r4 |
| addi r3, r3, 0x111 /* increment VSID */ |
| addis r4, r4, 0x1000 /* address of next segment */ |
| bdnz 3b |
| blr |
| |
| /* |
| * This is where the main kernel code starts. |
| */ |
| start_here: |
| /* ptr to current */ |
| lis r2,init_task@h |
| ori r2,r2,init_task@l |
| /* Set up for using our exception vectors */ |
| /* ptr to phys current thread */ |
| tophys(r4,r2) |
| addi r4,r4,THREAD /* init task's THREAD */ |
| mtspr SPRN_SPRG_THREAD,r4 |
| BEGIN_MMU_FTR_SECTION |
| lis r4, (swapper_pg_dir - PAGE_OFFSET)@h |
| ori r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l |
| rlwinm r4, r4, 4, 0xffff01ff |
| mtspr SPRN_SDR1, r4 |
| END_MMU_FTR_SECTION_IFCLR(MMU_FTR_HPTE_TABLE) |
| |
| /* stack */ |
| lis r1,init_thread_union@ha |
| addi r1,r1,init_thread_union@l |
| li r0,0 |
| stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1) |
| /* |
| * Do early platform-specific initialization, |
| * and set up the MMU. |
| */ |
| #ifdef CONFIG_KASAN |
| bl kasan_early_init |
| #endif |
| li r3,0 |
| mr r4,r31 |
| bl machine_init |
| bl __save_cpu_setup |
| bl MMU_init |
| bl MMU_init_hw_patch |
| |
| /* |
| * Go back to running unmapped so we can load up new values |
| * for SDR1 (hash table pointer) and the segment registers |
| * and change to using our exception vectors. |
| */ |
| lis r4,2f@h |
| ori r4,r4,2f@l |
| tophys(r4,r4) |
| li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR) |
| |
| .align 4 |
| mtspr SPRN_SRR0,r4 |
| mtspr SPRN_SRR1,r3 |
| rfi |
| /* Load up the kernel context */ |
| 2: bl load_up_mmu |
| |
| #ifdef CONFIG_BDI_SWITCH |
| /* Add helper information for the Abatron bdiGDB debugger. |
| * We do this here because we know the mmu is disabled, and |
| * will be enabled for real in just a few instructions. |
| */ |
| lis r5, abatron_pteptrs@h |
| ori r5, r5, abatron_pteptrs@l |
| stw r5, 0xf0(0) /* This much match your Abatron config */ |
| lis r6, swapper_pg_dir@h |
| ori r6, r6, swapper_pg_dir@l |
| tophys(r5, r5) |
| stw r6, 0(r5) |
| #endif /* CONFIG_BDI_SWITCH */ |
| |
| /* Now turn on the MMU for real! */ |
| li r4,MSR_KERNEL |
| lis r3,start_kernel@h |
| ori r3,r3,start_kernel@l |
| mtspr SPRN_SRR0,r3 |
| mtspr SPRN_SRR1,r4 |
| rfi |
| |
| /* |
| * An undocumented "feature" of 604e requires that the v bit |
| * be cleared before changing BAT values. |
| * |
| * Also, newer IBM firmware does not clear bat3 and 4 so |
| * this makes sure it's done. |
| * -- Cort |
| */ |
| clear_bats: |
| li r10,0 |
| |
| mtspr SPRN_DBAT0U,r10 |
| mtspr SPRN_DBAT0L,r10 |
| mtspr SPRN_DBAT1U,r10 |
| mtspr SPRN_DBAT1L,r10 |
| mtspr SPRN_DBAT2U,r10 |
| mtspr SPRN_DBAT2L,r10 |
| mtspr SPRN_DBAT3U,r10 |
| mtspr SPRN_DBAT3L,r10 |
| mtspr SPRN_IBAT0U,r10 |
| mtspr SPRN_IBAT0L,r10 |
| mtspr SPRN_IBAT1U,r10 |
| mtspr SPRN_IBAT1L,r10 |
| mtspr SPRN_IBAT2U,r10 |
| mtspr SPRN_IBAT2L,r10 |
| mtspr SPRN_IBAT3U,r10 |
| mtspr SPRN_IBAT3L,r10 |
| BEGIN_MMU_FTR_SECTION |
| /* Here's a tweak: at this point, CPU setup have |
| * not been called yet, so HIGH_BAT_EN may not be |
| * set in HID0 for the 745x processors. However, it |
| * seems that doesn't affect our ability to actually |
| * write to these SPRs. |
| */ |
| mtspr SPRN_DBAT4U,r10 |
| mtspr SPRN_DBAT4L,r10 |
| mtspr SPRN_DBAT5U,r10 |
| mtspr SPRN_DBAT5L,r10 |
| mtspr SPRN_DBAT6U,r10 |
| mtspr SPRN_DBAT6L,r10 |
| mtspr SPRN_DBAT7U,r10 |
| mtspr SPRN_DBAT7L,r10 |
| mtspr SPRN_IBAT4U,r10 |
| mtspr SPRN_IBAT4L,r10 |
| mtspr SPRN_IBAT5U,r10 |
| mtspr SPRN_IBAT5L,r10 |
| mtspr SPRN_IBAT6U,r10 |
| mtspr SPRN_IBAT6L,r10 |
| mtspr SPRN_IBAT7U,r10 |
| mtspr SPRN_IBAT7L,r10 |
| END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) |
| blr |
| |
| _ENTRY(update_bats) |
| lis r4, 1f@h |
| ori r4, r4, 1f@l |
| tophys(r4, r4) |
| mfmsr r6 |
| mflr r7 |
| li r3, MSR_KERNEL & ~(MSR_IR | MSR_DR) |
| rlwinm r0, r6, 0, ~MSR_RI |
| rlwinm r0, r0, 0, ~MSR_EE |
| mtmsr r0 |
| |
| .align 4 |
| mtspr SPRN_SRR0, r4 |
| mtspr SPRN_SRR1, r3 |
| rfi |
| 1: bl clear_bats |
| lis r3, BATS@ha |
| addi r3, r3, BATS@l |
| tophys(r3, r3) |
| LOAD_BAT(0, r3, r4, r5) |
| LOAD_BAT(1, r3, r4, r5) |
| LOAD_BAT(2, r3, r4, r5) |
| LOAD_BAT(3, r3, r4, r5) |
| BEGIN_MMU_FTR_SECTION |
| LOAD_BAT(4, r3, r4, r5) |
| LOAD_BAT(5, r3, r4, r5) |
| LOAD_BAT(6, r3, r4, r5) |
| LOAD_BAT(7, r3, r4, r5) |
| END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) |
| li r3, MSR_KERNEL & ~(MSR_IR | MSR_DR | MSR_RI) |
| mtmsr r3 |
| mtspr SPRN_SRR0, r7 |
| mtspr SPRN_SRR1, r6 |
| rfi |
| |
| flush_tlbs: |
| lis r10, 0x40 |
| 1: addic. r10, r10, -0x1000 |
| tlbie r10 |
| bgt 1b |
| sync |
| blr |
| |
| mmu_off: |
| addi r4, r3, __after_mmu_off - _start |
| mfmsr r3 |
| andi. r0,r3,MSR_DR|MSR_IR /* MMU enabled? */ |
| beqlr |
| andc r3,r3,r0 |
| |
| .align 4 |
| mtspr SPRN_SRR0,r4 |
| mtspr SPRN_SRR1,r3 |
| sync |
| rfi |
| |
| /* We use one BAT to map up to 256M of RAM at _PAGE_OFFSET */ |
| initial_bats: |
| lis r11,PAGE_OFFSET@h |
| tophys(r8,r11) |
| #ifdef CONFIG_SMP |
| ori r8,r8,0x12 /* R/W access, M=1 */ |
| #else |
| ori r8,r8,2 /* R/W access */ |
| #endif /* CONFIG_SMP */ |
| ori r11,r11,BL_256M<<2|0x2 /* set up BAT registers for 604 */ |
| |
| mtspr SPRN_DBAT0L,r8 /* N.B. 6xx have valid */ |
| mtspr SPRN_DBAT0U,r11 /* bit in upper BAT register */ |
| mtspr SPRN_IBAT0L,r8 |
| mtspr SPRN_IBAT0U,r11 |
| isync |
| blr |
| |
| #ifdef CONFIG_BOOTX_TEXT |
| setup_disp_bat: |
| /* |
| * setup the display bat prepared for us in prom.c |
| */ |
| mflr r8 |
| bl reloc_offset |
| mtlr r8 |
| addis r8,r3,disp_BAT@ha |
| addi r8,r8,disp_BAT@l |
| cmpwi cr0,r8,0 |
| beqlr |
| lwz r11,0(r8) |
| lwz r8,4(r8) |
| mtspr SPRN_DBAT3L,r8 |
| mtspr SPRN_DBAT3U,r11 |
| blr |
| #endif /* CONFIG_BOOTX_TEXT */ |
| |
| #ifdef CONFIG_PPC_EARLY_DEBUG_CPM |
| setup_cpm_bat: |
| lis r8, 0xf000 |
| ori r8, r8, 0x002a |
| mtspr SPRN_DBAT1L, r8 |
| |
| lis r11, 0xf000 |
| ori r11, r11, (BL_1M << 2) | 2 |
| mtspr SPRN_DBAT1U, r11 |
| |
| blr |
| #endif |
| |
| #ifdef CONFIG_PPC_EARLY_DEBUG_USBGECKO |
| setup_usbgecko_bat: |
| /* prepare a BAT for early io */ |
| #if defined(CONFIG_GAMECUBE) |
| lis r8, 0x0c00 |
| #elif defined(CONFIG_WII) |
| lis r8, 0x0d00 |
| #else |
| #error Invalid platform for USB Gecko based early debugging. |
| #endif |
| /* |
| * The virtual address used must match the virtual address |
| * associated to the fixmap entry FIX_EARLY_DEBUG_BASE. |
| */ |
| lis r11, 0xfffe /* top 128K */ |
| ori r8, r8, 0x002a /* uncached, guarded ,rw */ |
| ori r11, r11, 0x2 /* 128K, Vs=1, Vp=0 */ |
| mtspr SPRN_DBAT1L, r8 |
| mtspr SPRN_DBAT1U, r11 |
| blr |
| #endif |
| |
| .data |
