| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * Kernel execution entry point code. |
| * |
| * Copyright (c) 1995-1996 Gary Thomas <gdt@linuxppc.org> |
| * Initial PowerPC version. |
| * Copyright (c) 1996 Cort Dougan <cort@cs.nmt.edu> |
| * Rewritten for PReP |
| * Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au> |
| * Low-level exception handers, MMU support, and rewrite. |
| * Copyright (c) 1997 Dan Malek <dmalek@jlc.net> |
| * PowerPC 8xx modifications. |
| * Copyright (c) 1998-1999 TiVo, Inc. |
| * PowerPC 403GCX modifications. |
| * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu> |
| * PowerPC 403GCX/405GP modifications. |
| * Copyright 2000 MontaVista Software Inc. |
| * PPC405 modifications |
| * PowerPC 403GCX/405GP modifications. |
| * Author: MontaVista Software, Inc. |
| * frank_rowand@mvista.com or source@mvista.com |
| * debbie_chu@mvista.com |
| * Copyright 2002-2004 MontaVista Software, Inc. |
| * PowerPC 44x support, Matt Porter <mporter@kernel.crashing.org> |
| * Copyright 2004 Freescale Semiconductor, Inc |
| * PowerPC e500 modifications, Kumar Gala <galak@kernel.crashing.org> |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/threads.h> |
| #include <linux/pgtable.h> |
| #include <asm/processor.h> |
| #include <asm/page.h> |
| #include <asm/mmu.h> |
| #include <asm/cputable.h> |
| #include <asm/thread_info.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/cache.h> |
| #include <asm/ptrace.h> |
| #include <asm/export.h> |
| #include <asm/feature-fixups.h> |
| #include "head_booke.h" |
| |
| /* As with the other PowerPC ports, it is expected that when code |
| * execution begins here, the following registers contain valid, yet |
| * optional, information: |
| * |
| * r3 - Board info structure pointer (DRAM, frequency, MAC address, etc.) |
| * r4 - Starting address of the init RAM disk |
| * r5 - Ending address of the init RAM disk |
| * r6 - Start of kernel command line string (e.g. "mem=128") |
| * r7 - End of kernel command line string |
| * |
| */ |
| __HEAD |
| _ENTRY(_stext); |
| _ENTRY(_start); |
| /* |
| * Reserve a word at a fixed location to store the address |
| * of abatron_pteptrs |
| */ |
| nop |
| |
| /* Translate device tree address to physical, save in r30/r31 */ |
| bl get_phys_addr |
| mr r30,r3 |
| mr r31,r4 |
| |
| li r25,0 /* phys kernel start (low) */ |
| li r24,0 /* CPU number */ |
| li r23,0 /* phys kernel start (high) */ |
| |
| #ifdef CONFIG_RELOCATABLE |
| LOAD_REG_ADDR_PIC(r3, _stext) /* Get our current runtime base */ |
| |
| /* Translate _stext address to physical, save in r23/r25 */ |
| bl get_phys_addr |
| mr r23,r3 |
| mr r25,r4 |
| |
| bl 0f |
| 0: mflr r8 |
| addis r3,r8,(is_second_reloc - 0b)@ha |
| lwz r19,(is_second_reloc - 0b)@l(r3) |
| |
| /* Check if this is the second relocation. */ |
| cmpwi r19,1 |
| bne 1f |
| |
| /* |
| * For the second relocation, we already get the real memstart_addr |
| * from device tree. So we will map PAGE_OFFSET to memstart_addr, |
| * then the virtual address of start kernel should be: |
| * PAGE_OFFSET + (kernstart_addr - memstart_addr) |
| * Since the offset between kernstart_addr and memstart_addr should |
| * never be beyond 1G, so we can just use the lower 32bit of them |
| * for the calculation. |
| */ |
| lis r3,PAGE_OFFSET@h |
| |
| addis r4,r8,(kernstart_addr - 0b)@ha |
| addi r4,r4,(kernstart_addr - 0b)@l |
| lwz r5,4(r4) |
| |
| addis r6,r8,(memstart_addr - 0b)@ha |
| addi r6,r6,(memstart_addr - 0b)@l |
| lwz r7,4(r6) |
| |
| subf r5,r7,r5 |
| add r3,r3,r5 |
| b 2f |
| |
| 1: |
| /* |
| * We have the runtime (virutal) address of our base. |
| * We calculate our shift of offset from a 64M page. |
| * We could map the 64M page we belong to at PAGE_OFFSET and |
| * get going from there. |
| */ |
| lis r4,KERNELBASE@h |
| ori r4,r4,KERNELBASE@l |
| rlwinm r6,r25,0,0x3ffffff /* r6 = PHYS_START % 64M */ |
| rlwinm r5,r4,0,0x3ffffff /* r5 = KERNELBASE % 64M */ |
| subf r3,r5,r6 /* r3 = r6 - r5 */ |
| add r3,r4,r3 /* Required Virtual Address */ |
| |
| 2: bl relocate |
| |
| /* |
| * For the second relocation, we already set the right tlb entries |
| * for the kernel space, so skip the code in fsl_booke_entry_mapping.S |
| */ |
| cmpwi r19,1 |
| beq set_ivor |
| #endif |
| |
| /* We try to not make any assumptions about how the boot loader |
| * setup or used the TLBs. We invalidate all mappings from the |
| * boot loader and load a single entry in TLB1[0] to map the |
| * first 64M of kernel memory. Any boot info passed from the |
| * bootloader needs to live in this first 64M. |
| * |
| * Requirement on bootloader: |
| * - The page we're executing in needs to reside in TLB1 and |
| * have IPROT=1. If not an invalidate broadcast could |
| * evict the entry we're currently executing in. |
| * |
| * r3 = Index of TLB1 were executing in |
| * r4 = Current MSR[IS] |
| * r5 = Index of TLB1 temp mapping |
| * |
| * Later in mapin_ram we will correctly map lowmem, and resize TLB1[0] |
| * if needed |
| */ |
| |
| _ENTRY(__early_start) |
| LOAD_REG_ADDR_PIC(r20, kernstart_virt_addr) |
| lwz r20,0(r20) |
| |
| #define ENTRY_MAPPING_BOOT_SETUP |
| #include "fsl_booke_entry_mapping.S" |
| #undef ENTRY_MAPPING_BOOT_SETUP |
| |
| set_ivor: |
| /* Establish the interrupt vector offsets */ |
| SET_IVOR(0, CriticalInput); |
| SET_IVOR(1, MachineCheck); |
| SET_IVOR(2, DataStorage); |
| SET_IVOR(3, InstructionStorage); |
| SET_IVOR(4, ExternalInput); |
| SET_IVOR(5, Alignment); |
| SET_IVOR(6, Program); |
| SET_IVOR(7, FloatingPointUnavailable); |
| SET_IVOR(8, SystemCall); |
| SET_IVOR(9, AuxillaryProcessorUnavailable); |
| SET_IVOR(10, Decrementer); |
| SET_IVOR(11, FixedIntervalTimer); |
| SET_IVOR(12, WatchdogTimer); |
| SET_IVOR(13, DataTLBError); |
| SET_IVOR(14, InstructionTLBError); |
| SET_IVOR(15, DebugCrit); |
| |
| /* Establish the interrupt vector base */ |
| lis r4,interrupt_base@h /* IVPR only uses the high 16-bits */ |
| mtspr SPRN_IVPR,r4 |
| |
| /* Setup the defaults for TLB entries */ |
| li r2,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l |
| mtspr SPRN_MAS4, r2 |
| |
| #if !defined(CONFIG_BDI_SWITCH) |
| /* |
| * The Abatron BDI JTAG debugger does not tolerate others |
| * mucking with the debug registers. |
| */ |
| lis r2,DBCR0_IDM@h |
| mtspr SPRN_DBCR0,r2 |
| isync |
| /* clear any residual debug events */ |
| li r2,-1 |
| mtspr SPRN_DBSR,r2 |
| #endif |
| |
| #ifdef CONFIG_SMP |
| /* Check to see if we're the second processor, and jump |
| * to the secondary_start code if so |
| */ |
| LOAD_REG_ADDR_PIC(r24, boot_cpuid) |
| lwz r24, 0(r24) |
| cmpwi r24, -1 |
| mfspr r24,SPRN_PIR |
| bne __secondary_start |
| #endif |
| |
| /* |
| * This is where the main kernel code starts. |
| */ |
| |
| /* ptr to current */ |
| lis r2,init_task@h |
| ori r2,r2,init_task@l |
| |
| /* ptr to current thread */ |
| addi r4,r2,THREAD /* init task's THREAD */ |
| mtspr SPRN_SPRG_THREAD,r4 |
| |
| /* stack */ |
| lis r1,init_thread_union@h |
| ori r1,r1,init_thread_union@l |
| li r0,0 |
| stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1) |
| |
| #ifdef CONFIG_SMP |
| stw r24, TASK_CPU(r2) |
| #endif |
| |
| bl early_init |
| |
| #ifdef CONFIG_KASAN |
| bl kasan_early_init |
| #endif |
| #ifdef CONFIG_RELOCATABLE |
| mr r3,r30 |
| mr r4,r31 |
| #ifdef CONFIG_PHYS_64BIT |
| mr r5,r23 |
| mr r6,r25 |
| #else |
| mr r5,r25 |
| #endif |
| bl relocate_init |
| #endif |
| |
| #ifdef CONFIG_DYNAMIC_MEMSTART |
| lis r3,kernstart_addr@ha |
| la r3,kernstart_addr@l(r3) |
| #ifdef CONFIG_PHYS_64BIT |
| stw r23,0(r3) |
| stw r25,4(r3) |
| #else |
| stw r25,0(r3) |
| #endif |
| #endif |
| |
| /* |
| * Decide what sort of machine this is and initialize the MMU. |
| */ |
| mr r3,r30 |
| mr r4,r31 |
| bl machine_init |
| bl MMU_init |
| |
| /* Setup PTE pointers for the Abatron bdiGDB */ |
| lis r6, swapper_pg_dir@h |
| ori r6, r6, swapper_pg_dir@l |
| lis r5, abatron_pteptrs@h |
| ori r5, r5, abatron_pteptrs@l |
| lis r3, kernstart_virt_addr@ha |
| lwz r4, kernstart_virt_addr@l(r3) |
| stw r5, 0(r4) /* Save abatron_pteptrs at a fixed location */ |
| stw r6, 0(r5) |
| |
| /* Let's move on */ |
| lis r4,start_kernel@h |
| ori r4,r4,start_kernel@l |
| lis r3,MSR_KERNEL@h |
| ori r3,r3,MSR_KERNEL@l |
| mtspr SPRN_SRR0,r4 |
| mtspr SPRN_SRR1,r3 |
| rfi /* change context and jump to start_kernel */ |
| |
| /* Macros to hide the PTE size differences |
| * |
| * FIND_PTE -- walks the page tables given EA & pgdir pointer |
| * r10 -- EA of fault |
| * r11 -- PGDIR pointer |
| * r12 -- free |
| * label 2: is the bailout case |
| * |
| * if we find the pte (fall through): |
| * r11 is low pte word |
| * r12 is pointer to the pte |
| * r10 is the pshift from the PGD, if we're a hugepage |
| */ |
| #ifdef CONFIG_PTE_64BIT |
| #ifdef CONFIG_HUGETLB_PAGE |
| #define FIND_PTE \ |
| rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \ |
| lwzx r11, r12, r11; /* Get pgd/pmd entry */ \ |
| rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \ |
| blt 1000f; /* Normal non-huge page */ \ |
| beq 2f; /* Bail if no table */ \ |
| oris r11, r11, PD_HUGE@h; /* Put back address bit */ \ |
| andi. r10, r11, HUGEPD_SHIFT_MASK@l; /* extract size field */ \ |
| xor r12, r10, r11; /* drop size bits from pointer */ \ |
| b 1001f; \ |
| 1000: rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \ |
| li r10, 0; /* clear r10 */ \ |
| 1001: lwz r11, 4(r12); /* Get pte entry */ |
| #else |
| #define FIND_PTE \ |
| rlwinm r12, r10, 13, 19, 29; /* Compute pgdir/pmd offset */ \ |
| lwzx r11, r12, r11; /* Get pgd/pmd entry */ \ |
| rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \ |
| beq 2f; /* Bail if no table */ \ |
| rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \ |
| lwz r11, 4(r12); /* Get pte entry */ |
| #endif /* HUGEPAGE */ |
| #else /* !PTE_64BIT */ |
| #define FIND_PTE \ |
| rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \ |
| lwz r11, 0(r11); /* Get L1 entry */ \ |
| rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \ |
| beq 2f; /* Bail if no table */ \ |
| rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \ |
| lwz r11, 0(r12); /* Get Linux PTE */ |
| #endif |
| |
| /* |
| * Interrupt vector entry code |
| * |
| * The Book E MMUs are always on so we don't need to handle |
| * interrupts in real mode as with previous PPC processors. In |
| * this case we handle interrupts in the kernel virtual address |
| * space. |
| * |
| * Interrupt vectors are dynamically placed relative to the |
| * interrupt prefix as determined by the address of interrupt_base. |
| * The interrupt vectors offsets are programmed using the labels |
| * for each interrupt vector entry. |
| * |
| * Interrupt vectors must be aligned on a 16 byte boundary. |
| * We align on a 32 byte cache line boundary for good measure. |
| */ |
| |
| interrupt_base: |
| /* Critical Input Interrupt */ |
| CRITICAL_EXCEPTION(0x0100, CRITICAL, CriticalInput, unknown_exception) |
| |
| /* Machine Check Interrupt */ |
| MCHECK_EXCEPTION(0x0200, MachineCheck, machine_check_exception) |
| |
| /* Data Storage Interrupt */ |
| START_EXCEPTION(DataStorage) |
| NORMAL_EXCEPTION_PROLOG(DATA_STORAGE) |
| mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */ |
| stw r5,_ESR(r11) |
| mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */ |
| andis. r10,r5,(ESR_ILK|ESR_DLK)@h |
| bne 1f |
| stw r4, _DEAR(r11) |
| EXC_XFER_LITE(0x0300, handle_page_fault) |
| 1: |
| addi r3,r1,STACK_FRAME_OVERHEAD |
| EXC_XFER_LITE(0x0300, CacheLockingException) |
| |
| /* Instruction Storage Interrupt */ |
| INSTRUCTION_STORAGE_EXCEPTION |
| |
| /* External Input Interrupt */ |
| EXCEPTION(0x0500, EXTERNAL, ExternalInput, do_IRQ, EXC_XFER_LITE) |
| |
| /* Alignment Interrupt */ |
| ALIGNMENT_EXCEPTION |
| |
| /* Program Interrupt */ |
| PROGRAM_EXCEPTION |
| |
| /* Floating Point Unavailable Interrupt */ |
| #ifdef CONFIG_PPC_FPU |
| FP_UNAVAILABLE_EXCEPTION |
| #else |
| EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, \ |
| unknown_exception, EXC_XFER_STD) |
| #endif |
| |
| /* System Call Interrupt */ |
| START_EXCEPTION(SystemCall) |
| SYSCALL_ENTRY 0xc00 BOOKE_INTERRUPT_SYSCALL SPRN_SRR1 |
| |
| /* Auxiliary Processor Unavailable Interrupt */ |
| EXCEPTION(0x2900, AP_UNAVAIL, AuxillaryProcessorUnavailable, \ |
| unknown_exception, EXC_XFER_STD) |
| |
| /* Decrementer Interrupt */ |
| DECREMENTER_EXCEPTION |
| |
| /* Fixed Internal Timer Interrupt */ |
| /* TODO: Add FIT support */ |
| EXCEPTION(0x3100, FIT, FixedIntervalTimer, \ |
| unknown_exception, EXC_XFER_STD) |
| |
| /* Watchdog Timer Interrupt */ |
| #ifdef CONFIG_BOOKE_WDT |
| CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, WatchdogException) |
| #else |
| CRITICAL_EXCEPTION(0x3200, WATCHDOG, WatchdogTimer, unknown_exception) |
| #endif |
| |
| /* Data TLB Error Interrupt */ |
| START_EXCEPTION(DataTLBError) |
| mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */ |
| mfspr r10, SPRN_SPRG_THREAD |
| stw r11, THREAD_NORMSAVE(0)(r10) |
| #ifdef CONFIG_KVM_BOOKE_HV |
| BEGIN_FTR_SECTION |
| mfspr r11, SPRN_SRR1 |
| END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) |
| #endif |
| stw r12, THREAD_NORMSAVE(1)(r10) |
| stw r13, THREAD_NORMSAVE(2)(r10) |
| mfcr r13 |
| stw r13, THREAD_NORMSAVE(3)(r10) |
| DO_KVM BOOKE_INTERRUPT_DTLB_MISS SPRN_SRR1 |
| START_BTB_FLUSH_SECTION |
| mfspr r11, SPRN_SRR1 |
| andi. r10,r11,MSR_PR |
| beq 1f |
| BTB_FLUSH(r10) |
| 1: |
| END_BTB_FLUSH_SECTION |
| mfspr r10, SPRN_DEAR /* Get faulting address */ |
| |
| /* If we are faulting a kernel address, we have to use the |
| * kernel page tables. |
| */ |
| lis r11, PAGE_OFFSET@h |
| cmplw 5, r10, r11 |
| blt 5, 3f |
| lis r11, swapper_pg_dir@h |
| ori r11, r11, swapper_pg_dir@l |
| |
| mfspr r12,SPRN_MAS1 /* Set TID to 0 */ |
| rlwinm r12,r12,0,16,1 |
| mtspr SPRN_MAS1,r12 |
| |
| b 4f |
| |
| /* Get the PGD for the current thread */ |
| 3: |
| mfspr r11,SPRN_SPRG_THREAD |
| lwz r11,PGDIR(r11) |
| |
| 4: |
| /* Mask of required permission bits. Note that while we |
| * do copy ESR:ST to _PAGE_RW position as trying to write |
| * to an RO page is pretty common, we don't do it with |
| * _PAGE_DIRTY. We could do it, but it's a fairly rare |
| * event so I'd rather take the overhead when it happens |
| * rather than adding an instruction here. We should measure |
| * whether the whole thing is worth it in the first place |
| * as we could avoid loading SPRN_ESR completely in the first |
| * place... |
| * |
| * TODO: Is it worth doing that mfspr & rlwimi in the first |
| * place or can we save a couple of instructions here ? |
| */ |
| mfspr r12,SPRN_ESR |
| #ifdef CONFIG_PTE_64BIT |
| li r13,_PAGE_PRESENT |
| oris r13,r13,_PAGE_ACCESSED@h |
| #else |
| li r13,_PAGE_PRESENT|_PAGE_ACCESSED |
| #endif |
| rlwimi r13,r12,11,29,29 |
| |
| FIND_PTE |
| andc. r13,r13,r11 /* Check permission */ |
| |
| #ifdef CONFIG_PTE_64BIT |
| #ifdef CONFIG_SMP |
| subf r13,r11,r12 /* create false data dep */ |
| lwzx r13,r11,r13 /* Get upper pte bits */ |
| #else |
| lwz r13,0(r12) /* Get upper pte bits */ |
| #endif |
| #endif |
| |
| bne 2f /* Bail if permission/valid mismach */ |
| |
| /* Jump to common tlb load */ |
| b finish_tlb_load |
| 2: |
| /* The bailout. Restore registers to pre-exception conditions |
| * and call the heavyweights to help us out. |
| */ |
| mfspr r10, SPRN_SPRG_THREAD |
| lwz r11, THREAD_NORMSAVE(3)(r10) |
| mtcr r11 |
| lwz r13, THREAD_NORMSAVE(2)(r10) |
| lwz r12, THREAD_NORMSAVE(1)(r10) |
| lwz r11, THREAD_NORMSAVE(0)(r10) |
| mfspr r10, SPRN_SPRG_RSCRATCH0 |
| b DataStorage |
| |
| /* Instruction TLB Error Interrupt */ |
| /* |
| * Nearly the same as above, except we get our |
| * information from different registers and bailout |
| * to a different point. |
| */ |
| START_EXCEPTION(InstructionTLBError) |
| mtspr SPRN_SPRG_WSCRATCH0, r10 /* Save some working registers */ |
| mfspr r10, SPRN_SPRG_THREAD |
| stw r11, THREAD_NORMSAVE(0)(r10) |
| #ifdef CONFIG_KVM_BOOKE_HV |
| BEGIN_FTR_SECTION |
| mfspr r11, SPRN_SRR1 |
| END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV) |
| #endif |
| stw r12, THREAD_NORMSAVE(1)(r10) |
| stw r13, THREAD_NORMSAVE(2)(r10) |
| mfcr r13 |
| stw r13, THREAD_NORMSAVE(3)(r10) |
| DO_KVM BOOKE_INTERRUPT_ITLB_MISS SPRN_SRR1 |
| START_BTB_FLUSH_SECTION |
| mfspr r11, SPRN_SRR1 |
| andi. r10,r11,MSR_PR |
| beq 1f |
| BTB_FLUSH(r10) |
| 1: |
| END_BTB_FLUSH_SECTION |
| |
| mfspr r10, SPRN_SRR0 /* Get faulting address */ |
| |
| /* If we are faulting a kernel address, we have to use the |
| * kernel page tables. |
| */ |
| lis r11, PAGE_OFFSET@h |
| cmplw 5, r10, r11 |
| blt 5, 3f |
| lis r11, swapper_pg_dir@h |
| ori r11, r11, swapper_pg_dir@l |
| |
| mfspr r12,SPRN_MAS1 /* Set TID to 0 */ |
| rlwinm r12,r12,0,16,1 |
| mtspr SPRN_MAS1,r12 |
| |
| /* Make up the required permissions for kernel code */ |
| #ifdef CONFIG_PTE_64BIT |
| li r13,_PAGE_PRESENT | _PAGE_BAP_SX |
| oris r13,r13,_PAGE_ACCESSED@h |
| #else |
| li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC |
| #endif |
| b 4f |
| |
| /* Get the PGD for the current thread */ |
| 3: |
| mfspr r11,SPRN_SPRG_THREAD |
| lwz r11,PGDIR(r11) |
| |
| /* Make up the required permissions for user code */ |
| #ifdef CONFIG_PTE_64BIT |
| li r13,_PAGE_PRESENT | _PAGE_BAP_UX |
| oris r13,r13,_PAGE_ACCESSED@h |
| #else |
| li r13,_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_EXEC |
| #endif |
| |
| 4: |
| FIND_PTE |
| andc. r13,r13,r11 /* Check permission */ |
| |
| #ifdef CONFIG_PTE_64BIT |
| #ifdef CONFIG_SMP |
| subf r13,r11,r12 /* create false data dep */ |
| lwzx r13,r11,r13 /* Get upper pte bits */ |
| #else |
| lwz r13,0(r12) /* Get upper pte bits */ |
| #endif |
| #endif |
| |
| bne 2f /* Bail if permission mismach */ |
| |
| /* Jump to common TLB load point */ |
| b finish_tlb_load |
| |
| 2: |
| /* The bailout. Restore registers to pre-exception conditions |
| * and call the heavyweights to help us out. |
| */ |
| mfspr r10, SPRN_SPRG_THREAD |
| lwz r11, THREAD_NORMSAVE(3)(r10) |
| mtcr r11 |
| lwz r13, THREAD_NORMSAVE(2)(r10) |
| lwz r12, THREAD_NORMSAVE(1)(r10) |
| lwz r11, THREAD_NORMSAVE(0)(r10) |
| mfspr r10, SPRN_SPRG_RSCRATCH0 |
| b InstructionStorage |
| |
| /* Define SPE handlers for e500v2 */ |
| #ifdef CONFIG_SPE |
| /* SPE Unavailable */ |
| START_EXCEPTION(SPEUnavailable) |
| NORMAL_EXCEPTION_PROLOG(SPE_UNAVAIL) |
| beq 1f |
| bl load_up_spe |
| b fast_exception_return |
| 1: addi r3,r1,STACK_FRAME_OVERHEAD |
| EXC_XFER_LITE(0x2010, KernelSPE) |
| #elif defined(CONFIG_SPE_POSSIBLE) |
| EXCEPTION(0x2020, SPE_UNAVAIL, SPEUnavailable, \ |
| unknown_exception, EXC_XFER_STD) |
| #endif /* CONFIG_SPE_POSSIBLE */ |
| |
| /* SPE Floating Point Data */ |
| #ifdef CONFIG_SPE |
| EXCEPTION(0x2030, SPE_FP_DATA, SPEFloatingPointData, |
| SPEFloatingPointException, EXC_XFER_STD) |
| |
| /* SPE Floating Point Round */ |
| EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \ |
| SPEFloatingPointRoundException, EXC_XFER_STD) |
| #elif defined(CONFIG_SPE_POSSIBLE) |
| EXCEPTION(0x2040, SPE_FP_DATA, SPEFloatingPointData, |
| unknown_exception, EXC_XFER_STD) |
| EXCEPTION(0x2050, SPE_FP_ROUND, SPEFloatingPointRound, \ |
| unknown_exception, EXC_XFER_STD) |
| #endif /* CONFIG_SPE_POSSIBLE */ |
| |
| |
| /* Performance Monitor */ |
| EXCEPTION(0x2060, PERFORMANCE_MONITOR, PerformanceMonitor, \ |
| performance_monitor_exception, EXC_XFER_STD) |
| |
| EXCEPTION(0x2070, DOORBELL, Doorbell, doorbell_exception, EXC_XFER_STD) |
| |
| CRITICAL_EXCEPTION(0x2080, DOORBELL_CRITICAL, \ |
| CriticalDoorbell, unknown_exception) |
| |
| /* Debug Interrupt */ |
| DEBUG_DEBUG_EXCEPTION |
| DEBUG_CRIT_EXCEPTION |
| |
| GUEST_DOORBELL_EXCEPTION |
| |
| CRITICAL_EXCEPTION(0, GUEST_DBELL_CRIT, CriticalGuestDoorbell, \ |
| unknown_exception) |
| |
| /* Hypercall */ |
| EXCEPTION(0, HV_SYSCALL, Hypercall, unknown_exception, EXC_XFER_STD) |
| |
| /* Embedded Hypervisor Privilege */ |
| EXCEPTION(0, HV_PRIV, Ehvpriv, unknown_exception, EXC_XFER_STD) |
| |
| interrupt_end: |
| |
| /* |
| * Local functions |
| */ |
| |
| /* |
| * Both the instruction and data TLB miss get to this |
| * point to load the TLB. |
| * r10 - tsize encoding (if HUGETLB_PAGE) or available to use |
| * r11 - TLB (info from Linux PTE) |
| * r12 - available to use |
| * r13 - upper bits of PTE (if PTE_64BIT) or available to use |
| * CR5 - results of addr >= PAGE_OFFSET |
| * MAS0, MAS1 - loaded with proper value when we get here |
| * MAS2, MAS3 - will need additional info from Linux PTE |
| * Upon exit, we reload everything and RFI. |
| */ |
| finish_tlb_load: |
| #ifdef CONFIG_HUGETLB_PAGE |
| cmpwi 6, r10, 0 /* check for huge page */ |
| beq 6, finish_tlb_load_cont /* !huge */ |
| |
| /* Alas, we need more scratch registers for hugepages */ |
| mfspr r12, SPRN_SPRG_THREAD |
| stw r14, THREAD_NORMSAVE(4)(r12) |
| stw r15, THREAD_NORMSAVE(5)(r12) |
| stw r16, THREAD_NORMSAVE(6)(r12) |
| stw r17, THREAD_NORMSAVE(7)(r12) |
| |
| /* Get the next_tlbcam_idx percpu var */ |
| #ifdef CONFIG_SMP |
| lwz r15, TASK_CPU-THREAD(r12) |
| lis r14, __per_cpu_offset@h |
| ori r14, r14, __per_cpu_offset@l |
| rlwinm r15, r15, 2, 0, 29 |
| lwzx r16, r14, r15 |
| #else |
| li r16, 0 |
| #endif |
| lis r17, next_tlbcam_idx@h |
| ori r17, r17, next_tlbcam_idx@l |
| add r17, r17, r16 /* r17 = *next_tlbcam_idx */ |
| lwz r15, 0(r17) /* r15 = next_tlbcam_idx */ |
| |
| lis r14, MAS0_TLBSEL(1)@h /* select TLB1 (TLBCAM) */ |
| rlwimi r14, r15, 16, 4, 15 /* next_tlbcam_idx entry */ |
| mtspr SPRN_MAS0, r14 |
| |
| /* Extract TLB1CFG(NENTRY) */ |
| mfspr r16, SPRN_TLB1CFG |
| andi. r16, r16, 0xfff |
| |
| /* Update next_tlbcam_idx, wrapping when necessary */ |
| addi r15, r15, 1 |
| cmpw r15, r16 |
| blt 100f |
| lis r14, tlbcam_index@h |
| ori r14, r14, tlbcam_index@l |
| lwz r15, 0(r14) |
| 100: stw r15, 0(r17) |
| |
| /* |
| * Calc MAS1_TSIZE from r10 (which has pshift encoded) |
| * tlb_enc = (pshift - 10). |
| */ |
| subi r15, r10, 10 |
| mfspr r16, SPRN_MAS1 |
| rlwimi r16, r15, 7, 20, 24 |
| mtspr SPRN_MAS1, r16 |
| |
| /* copy the pshift for use later */ |
| mr r14, r10 |
| |
| /* fall through */ |
| |
| #endif /* CONFIG_HUGETLB_PAGE */ |
| |
| /* |
| * We set execute, because we don't have the granularity to |
| * properly set this at the page level (Linux problem). |
| * Many of these bits are software only. Bits we don't set |
| * here we (properly should) assume have the appropriate value. |
| */ |
| finish_tlb_load_cont: |
| #ifdef CONFIG_PTE_64BIT |
| rlwinm r12, r11, 32-2, 26, 31 /* Move in perm bits */ |
| andi. r10, r11, _PAGE_DIRTY |
| bne 1f |
| li r10, MAS3_SW | MAS3_UW |
| andc r12, r12, r10 |
| 1: rlwimi r12, r13, 20, 0, 11 /* grab RPN[32:43] */ |
| rlwimi r12, r11, 20, 12, 19 /* grab RPN[44:51] */ |
| 2: mtspr SPRN_MAS3, r12 |
| BEGIN_MMU_FTR_SECTION |
| srwi r10, r13, 12 /* grab RPN[12:31] */ |
| mtspr SPRN_MAS7, r10 |
| END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS) |
| #else |
| li r10, (_PAGE_EXEC | _PAGE_PRESENT) |
| mr r13, r11 |
| rlwimi r10, r11, 31, 29, 29 /* extract _PAGE_DIRTY into SW */ |
| and r12, r11, r10 |
| andi. r10, r11, _PAGE_USER /* Test for _PAGE_USER */ |
| slwi r10, r12, 1 |
| or r10, r10, r12 |
| iseleq r12, r12, r10 |
| rlwimi r13, r12, 0, 20, 31 /* Get RPN from PTE, merge w/ perms */ |
| mtspr SPRN_MAS3, r13 |
| #endif |
| |
| mfspr r12, SPRN_MAS2 |
| #ifdef CONFIG_PTE_64BIT |
| rlwimi r12, r11, 32-19, 27, 31 /* extract WIMGE from pte */ |
| #else |
| rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */ |
| #endif |
| #ifdef CONFIG_HUGETLB_PAGE |
| beq 6, 3f /* don't mask if page isn't huge */ |
| li r13, 1 |
| slw r13, r13, r14 |
| subi r13, r13, 1 |
| rlwinm r13, r13, 0, 0, 19 /* bottom bits used for WIMGE/etc */ |
| andc r12, r12, r13 /* mask off ea bits within the page */ |
| #endif |
| 3: mtspr SPRN_MAS2, r12 |
| |
| tlb_write_entry: |
| tlbwe |
| |
| /* Done...restore registers and get out of here. */ |
| mfspr r10, SPRN_SPRG_THREAD |
| #ifdef CONFIG_HUGETLB_PAGE |
| beq 6, 8f /* skip restore for 4k page faults */ |
| lwz r14, THREAD_NORMSAVE(4)(r10) |
| lwz r15, THREAD_NORMSAVE(5)(r10) |
| lwz r16, THREAD_NORMSAVE(6)(r10) |
| lwz r17, THREAD_NORMSAVE(7)(r10) |
| #endif |
| 8: lwz r11, THREAD_NORMSAVE(3)(r10) |
| mtcr r11 |
| lwz r13, THREAD_NORMSAVE(2)(r10) |
| lwz r12, THREAD_NORMSAVE(1)(r10) |
| lwz r11, THREAD_NORMSAVE(0)(r10) |
| mfspr r10, SPRN_SPRG_RSCRATCH0 |
| rfi /* Force context change */ |
| |
| #ifdef CONFIG_SPE |
| /* Note that the SPE support is closely modeled after the AltiVec |
| * support. Changes to one are likely to be applicable to the |
| * other! */ |
| _GLOBAL(load_up_spe) |
| /* |
| * Disable SPE for the task which had SPE previously, |
| * and save its SPE registers in its thread_struct. |
| * Enables SPE for use in the kernel on return. |
| * On SMP we know the SPE units are free, since we give it up every |
| * switch. -- Kumar |
| */ |
| mfmsr r5 |
| oris r5,r5,MSR_SPE@h |
| mtmsr r5 /* enable use of SPE now */ |
| isync |
| /* enable use of SPE after return */ |
| oris r9,r9,MSR_SPE@h |
| mfspr r5,SPRN_SPRG_THREAD /* current task's THREAD (phys) */ |
| li r4,1 |
| li r10,THREAD_ACC |
| stw r4,THREAD_USED_SPE(r5) |
| evlddx evr4,r10,r5 |
| evmra evr4,evr4 |
| REST_32EVRS(0,r10,r5,THREAD_EVR0) |
| blr |
| |
| /* |
| * SPE unavailable trap from kernel - print a message, but let |
| * the task use SPE in the kernel until it returns to user mode. |
| */ |
| KernelSPE: |
| lwz r3,_MSR(r1) |
| oris r3,r3,MSR_SPE@h |
| stw r3,_MSR(r1) /* enable use of SPE after return */ |
| #ifdef CONFIG_PRINTK |
| lis r3,87f@h |
| ori r3,r3,87f@l |
| mr r4,r2 /* current */ |
| lwz r5,_NIP(r1) |
| bl printk |
| #endif |
| b ret_from_except |
| #ifdef CONFIG_PRINTK |
| 87: .string "SPE used in kernel (task=%p, pc=%x) \n" |
| #endif |
| .align 4,0 |
| |
| #endif /* CONFIG_SPE */ |
| |
| /* |
| * Translate the effec addr in r3 to phys addr. The phys addr will be put |
| * into r3(higher 32bit) and r4(lower 32bit) |
| */ |
| get_phys_addr: |
| mfmsr r8 |
| mfspr r9,SPRN_PID |
| rlwinm r9,r9,16,0x3fff0000 /* turn PID into MAS6[SPID] */ |
| rlwimi r9,r8,28,0x00000001 /* turn MSR[DS] into MAS6[SAS] */ |
| mtspr SPRN_MAS6,r9 |
| |
| tlbsx 0,r3 /* must succeed */ |
| |
| mfspr r8,SPRN_MAS1 |
| mfspr r12,SPRN_MAS3 |
| rlwinm r9,r8,25,0x1f /* r9 = log2(page size) */ |
| li r10,1024 |
| slw r10,r10,r9 /* r10 = page size */ |
| addi r10,r10,-1 |
| and r11,r3,r10 /* r11 = page offset */ |
| andc r4,r12,r10 /* r4 = page base */ |
| or r4,r4,r11 /* r4 = devtree phys addr */ |
| #ifdef CONFIG_PHYS_64BIT |
| mfspr r3,SPRN_MAS7 |
| #endif |
| blr |
| |
| /* |
| * Global functions |
| */ |
| |
| #ifdef CONFIG_E500 |
| #ifndef CONFIG_PPC_E500MC |
| /* Adjust or setup IVORs for e500v1/v2 */ |
| _GLOBAL(__setup_e500_ivors) |
| li r3,DebugCrit@l |
| mtspr SPRN_IVOR15,r3 |
| li r3,SPEUnavailable@l |
| mtspr SPRN_IVOR32,r3 |
| li r3,SPEFloatingPointData@l |
| mtspr SPRN_IVOR33,r3 |
| li r3,SPEFloatingPointRound@l |
| mtspr SPRN_IVOR34,r3 |
| li r3,PerformanceMonitor@l |
| mtspr SPRN_IVOR35,r3 |
| sync |
| blr |
| #else |
| /* Adjust or setup IVORs for e500mc */ |
| _GLOBAL(__setup_e500mc_ivors) |
| li r3,DebugDebug@l |
| mtspr SPRN_IVOR15,r3 |
| li r3,PerformanceMonitor@l |
| mtspr SPRN_IVOR35,r3 |
| li r3,Doorbell@l |
| mtspr SPRN_IVOR36,r3 |
| li r3,CriticalDoorbell@l |
| mtspr SPRN_IVOR37,r3 |
| sync |
| blr |
| |
| /* setup ehv ivors for */ |
| _GLOBAL(__setup_ehv_ivors) |
| li r3,GuestDoorbell@l |
| mtspr SPRN_IVOR38,r3 |
| li r3,CriticalGuestDoorbell@l |
| mtspr SPRN_IVOR39,r3 |
| li r3,Hypercall@l |
| mtspr SPRN_IVOR40,r3 |
| li r3,Ehvpriv@l |
| mtspr SPRN_IVOR41,r3 |
| sync |
| blr |
| #endif /* CONFIG_PPC_E500MC */ |
| #endif /* CONFIG_E500 */ |
| |
| #ifdef CONFIG_SPE |
| /* |
| * extern void __giveup_spe(struct task_struct *prev) |
| * |
| */ |
| _GLOBAL(__giveup_spe) |
| addi r3,r3,THREAD /* want THREAD of task */ |
| lwz r5,PT_REGS(r3) |
| cmpi 0,r5,0 |
| SAVE_32EVRS(0, r4, r3, THREAD_EVR0) |
| evxor evr6, evr6, evr6 /* clear out evr6 */ |
| evmwumiaa evr6, evr6, evr6 /* evr6 <- ACC = 0 * 0 + ACC */ |
| li r4,THREAD_ACC |
| evstddx evr6, r4, r3 /* save off accumulator */ |
| beq 1f |
| lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5) |
| lis r3,MSR_SPE@h |
| andc r4,r4,r3 /* disable SPE for previous task */ |
| stw r4,_MSR-STACK_FRAME_OVERHEAD(r5) |
| 1: |
| blr |
| #endif /* CONFIG_SPE */ |
| |
| /* |
| * extern void abort(void) |
| * |
| * At present, this routine just applies a system reset. |
| */ |
| _GLOBAL(abort) |
| li r13,0 |
| mtspr SPRN_DBCR0,r13 /* disable all debug events */ |
| isync |
| mfmsr r13 |
| ori r13,r13,MSR_DE@l /* Enable Debug Events */ |
| mtmsr r13 |
| isync |
| mfspr r13,SPRN_DBCR0 |
| lis r13,(DBCR0_IDM|DBCR0_RST_CHIP)@h |
| mtspr SPRN_DBCR0,r13 |
| isync |
| |
| _GLOBAL(set_context) |
| |
| #ifdef CONFIG_BDI_SWITCH |
| /* Context switch the PTE pointer for the Abatron BDI2000. |
| * The PGDIR is the second parameter. |
| */ |
| lis r5, abatron_pteptrs@h |
| ori r5, r5, abatron_pteptrs@l |
| stw r4, 0x4(r5) |
| #endif |
| mtspr SPRN_PID,r3 |
| isync /* Force context change */ |
| blr |
| |
| #ifdef CONFIG_SMP |
| /* When we get here, r24 needs to hold the CPU # */ |
| .globl __secondary_start |
| __secondary_start: |
| LOAD_REG_ADDR_PIC(r3, tlbcam_index) |
| lwz r3,0(r3) |
| mtctr r3 |
| li r26,0 /* r26 safe? */ |
| |
| bl switch_to_as1 |
| mr r27,r3 /* tlb entry */ |
| /* Load each CAM entry */ |
| 1: mr r3,r26 |
| bl loadcam_entry |
| addi r26,r26,1 |
| bdnz 1b |
| mr r3,r27 /* tlb entry */ |
| LOAD_REG_ADDR_PIC(r4, memstart_addr) |
| lwz r4,0(r4) |
| mr r5,r25 /* phys kernel start */ |
| rlwinm r5,r5,0,~0x3ffffff /* aligned 64M */ |
| subf r4,r5,r4 /* memstart_addr - phys kernel start */ |
| lis r7,KERNELBASE@h |
| ori r7,r7,KERNELBASE@l |
| cmpw r20,r7 /* if kernstart_virt_addr != KERNELBASE, randomized */ |
| beq 2f |
| li r4,0 |
| 2: li r5,0 /* no device tree */ |
| li r6,0 /* not boot cpu */ |
| bl restore_to_as0 |
| |
| |
| lis r3,__secondary_hold_acknowledge@h |
| ori r3,r3,__secondary_hold_acknowledge@l |
| stw r24,0(r3) |
| |
| li r3,0 |
| mr r4,r24 /* Why? */ |
| bl call_setup_cpu |
| |
| /* get current's stack and current */ |
| lis r2,secondary_current@ha |
| lwz r2,secondary_current@l(r2) |
| lwz r1,TASK_STACK(r2) |
| |
| /* stack */ |
| addi r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD |
| li r0,0 |
| stw r0,0(r1) |
| |
| /* ptr to current thread */ |
| addi r4,r2,THREAD /* address of our thread_struct */ |
| mtspr SPRN_SPRG_THREAD,r4 |
| |
| /* Setup the defaults for TLB entries */ |
| li r4,(MAS4_TSIZED(BOOK3E_PAGESZ_4K))@l |
| mtspr SPRN_MAS4,r4 |
| |
| /* Jump to start_secondary */ |
| lis r4,MSR_KERNEL@h |
| ori r4,r4,MSR_KERNEL@l |
| lis r3,start_secondary@h |
| ori r3,r3,start_secondary@l |
| mtspr SPRN_SRR0,r3 |
| mtspr SPRN_SRR1,r4 |
| sync |
| rfi |
| sync |
| |
| .globl __secondary_hold_acknowledge |
| __secondary_hold_acknowledge: |
| .long -1 |
| #endif |
| |
| /* |
| * Create a 64M tlb by address and entry |
| * r3 - entry |
| * r4 - virtual address |
| * r5/r6 - physical address |
| */ |
| _GLOBAL(create_kaslr_tlb_entry) |
| lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */ |
| mtspr SPRN_MAS0,r7 /* Write MAS0 */ |
| |
| lis r3,(MAS1_VALID|MAS1_IPROT)@h |
| ori r3,r3,(MAS1_TSIZE(BOOK3E_PAGESZ_64M))@l |
| mtspr SPRN_MAS1,r3 /* Write MAS1 */ |
| |
| lis r3,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@h |
| ori r3,r3,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@l |
| and r3,r3,r4 |
| ori r3,r3,MAS2_M_IF_NEEDED@l |
| mtspr SPRN_MAS2,r3 /* Write MAS2(EPN) */ |
| |
| #ifdef CONFIG_PHYS_64BIT |
| ori r8,r6,(MAS3_SW|MAS3_SR|MAS3_SX) |
| mtspr SPRN_MAS3,r8 /* Write MAS3(RPN) */ |
| mtspr SPRN_MAS7,r5 |
| #else |
| ori r8,r5,(MAS3_SW|MAS3_SR|MAS3_SX) |
| mtspr SPRN_MAS3,r8 /* Write MAS3(RPN) */ |
| #endif |
| |
| tlbwe /* Write TLB */ |
| isync |
| sync |
| blr |
| |
| /* |
| * Return to the start of the relocated kernel and run again |
| * r3 - virtual address of fdt |
| * r4 - entry of the kernel |
| */ |
| _GLOBAL(reloc_kernel_entry) |
| mfmsr r7 |
| rlwinm r7, r7, 0, ~(MSR_IS | MSR_DS) |
| |
| mtspr SPRN_SRR0,r4 |
| mtspr SPRN_SRR1,r7 |
| rfi |
| |
| /* |
| * Create a tlb entry with the same effective and physical address as |
| * the tlb entry used by the current running code. But set the TS to 1. |
| * Then switch to the address space 1. It will return with the r3 set to |
| * the ESEL of the new created tlb. |
| */ |
| _GLOBAL(switch_to_as1) |
| mflr r5 |
| |
| /* Find a entry not used */ |
| mfspr r3,SPRN_TLB1CFG |
| andi. r3,r3,0xfff |
| mfspr r4,SPRN_PID |
| rlwinm r4,r4,16,0x3fff0000 /* turn PID into MAS6[SPID] */ |
| mtspr SPRN_MAS6,r4 |
| 1: lis r4,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| addi r3,r3,-1 |
| rlwimi r4,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ |
| mtspr SPRN_MAS0,r4 |
| tlbre |
| mfspr r4,SPRN_MAS1 |
| andis. r4,r4,MAS1_VALID@h |
| bne 1b |
| |
| /* Get the tlb entry used by the current running code */ |
| bl 0f |
| 0: mflr r4 |
| tlbsx 0,r4 |
| |
| mfspr r4,SPRN_MAS1 |
| ori r4,r4,MAS1_TS /* Set the TS = 1 */ |
| mtspr SPRN_MAS1,r4 |
| |
| mfspr r4,SPRN_MAS0 |
| rlwinm r4,r4,0,~MAS0_ESEL_MASK |
| rlwimi r4,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ |
| mtspr SPRN_MAS0,r4 |
| tlbwe |
| isync |
| sync |
| |
| mfmsr r4 |
| ori r4,r4,MSR_IS | MSR_DS |
| mtspr SPRN_SRR0,r5 |
| mtspr SPRN_SRR1,r4 |
| sync |
| rfi |
| |
| /* |
| * Restore to the address space 0 and also invalidate the tlb entry created |
| * by switch_to_as1. |
| * r3 - the tlb entry which should be invalidated |
| * r4 - __pa(PAGE_OFFSET in AS1) - __pa(PAGE_OFFSET in AS0) |
| * r5 - device tree virtual address. If r4 is 0, r5 is ignored. |
| * r6 - boot cpu |
| */ |
| _GLOBAL(restore_to_as0) |
| mflr r0 |
| |
| bl 0f |
| 0: mflr r9 |
| addi r9,r9,1f - 0b |
| |
| /* |
| * We may map the PAGE_OFFSET in AS0 to a different physical address, |
| * so we need calculate the right jump and device tree address based |
| * on the offset passed by r4. |
| */ |
| add r9,r9,r4 |
| add r5,r5,r4 |
| add r0,r0,r4 |
| |
| 2: mfmsr r7 |
| li r8,(MSR_IS | MSR_DS) |
| andc r7,r7,r8 |
| |
| mtspr SPRN_SRR0,r9 |
| mtspr SPRN_SRR1,r7 |
| sync |
| rfi |
| |
| /* Invalidate the temporary tlb entry for AS1 */ |
| 1: lis r9,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r9,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ |
| mtspr SPRN_MAS0,r9 |
| tlbre |
| mfspr r9,SPRN_MAS1 |
| rlwinm r9,r9,0,2,31 /* Clear MAS1 Valid and IPPROT */ |
| mtspr SPRN_MAS1,r9 |
| tlbwe |
| isync |
| |
| cmpwi r4,0 |
| cmpwi cr1,r6,0 |
| cror eq,4*cr1+eq,eq |
| bne 3f /* offset != 0 && is_boot_cpu */ |
| mtlr r0 |
| blr |
| |
| /* |
| * The PAGE_OFFSET will map to a different physical address, |
| * jump to _start to do another relocation again. |
| */ |
| 3: mr r3,r5 |
| bl _start |
| |
| /* |
| * We put a few things here that have to be page-aligned. This stuff |
| * goes at the beginning of the data segment, which is page-aligned. |
| */ |
| .data |
| .align 12 |
| .globl sdata |
| sdata: |
| .globl empty_zero_page |
| empty_zero_page: |
| .space 4096 |
| EXPORT_SYMBOL(empty_zero_page) |
| .globl swapper_pg_dir |
| swapper_pg_dir: |
| .space PGD_TABLE_SIZE |
| |
| /* |
| * Room for two PTE pointers, usually the kernel and current user pointers |
| * to their respective root page table. |
| */ |
| abatron_pteptrs: |
| .space 8 |
