| /* |
| * arch/ppc/kernel/head_fsl_booke.S |
| * |
| * 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 <kumar.gala@freescale.com> |
| * |
| * 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/config.h> |
| #include <linux/threads.h> |
| #include <asm/processor.h> |
| #include <asm/page.h> |
| #include <asm/mmu.h> |
| #include <asm/pgtable.h> |
| #include <asm/cputable.h> |
| #include <asm/thread_info.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/offsets.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 |
| * |
| */ |
| .text |
| _GLOBAL(_stext) |
| _GLOBAL(_start) |
| /* |
| * Reserve a word at a fixed location to store the address |
| * of abatron_pteptrs |
| */ |
| nop |
| /* |
| * Save parameters we are passed |
| */ |
| mr r31,r3 |
| mr r30,r4 |
| mr r29,r5 |
| mr r28,r6 |
| mr r27,r7 |
| li r24,0 /* CPU number */ |
| |
| /* 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 16M of kernel memory. Any boot info passed from the |
| * bootloader needs to live in this first 16M. |
| * |
| * 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 |
| */ |
| |
| /* 1. Find the index of the entry we're executing in */ |
| bl invstr /* Find our address */ |
| invstr: mflr r6 /* Make it accessible */ |
| mfmsr r7 |
| rlwinm r4,r7,27,31,31 /* extract MSR[IS] */ |
| mfspr r7, SPRN_PID0 |
| slwi r7,r7,16 |
| or r7,r7,r4 |
| mtspr SPRN_MAS6,r7 |
| tlbsx 0,r6 /* search MSR[IS], SPID=PID0 */ |
| #ifndef CONFIG_E200 |
| mfspr r7,SPRN_MAS1 |
| andis. r7,r7,MAS1_VALID@h |
| bne match_TLB |
| mfspr r7,SPRN_PID1 |
| slwi r7,r7,16 |
| or r7,r7,r4 |
| mtspr SPRN_MAS6,r7 |
| tlbsx 0,r6 /* search MSR[IS], SPID=PID1 */ |
| mfspr r7,SPRN_MAS1 |
| andis. r7,r7,MAS1_VALID@h |
| bne match_TLB |
| mfspr r7, SPRN_PID2 |
| slwi r7,r7,16 |
| or r7,r7,r4 |
| mtspr SPRN_MAS6,r7 |
| tlbsx 0,r6 /* Fall through, we had to match */ |
| #endif |
| match_TLB: |
| mfspr r7,SPRN_MAS0 |
| rlwinm r3,r7,16,20,31 /* Extract MAS0(Entry) */ |
| |
| mfspr r7,SPRN_MAS1 /* Insure IPROT set */ |
| oris r7,r7,MAS1_IPROT@h |
| mtspr SPRN_MAS1,r7 |
| tlbwe |
| |
| /* 2. Invalidate all entries except the entry we're executing in */ |
| mfspr r9,SPRN_TLB1CFG |
| andi. r9,r9,0xfff |
| li r6,0 /* Set Entry counter to 0 */ |
| 1: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */ |
| mtspr SPRN_MAS0,r7 |
| tlbre |
| mfspr r7,SPRN_MAS1 |
| rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */ |
| cmpw r3,r6 |
| beq skpinv /* Dont update the current execution TLB */ |
| mtspr SPRN_MAS1,r7 |
| tlbwe |
| isync |
| skpinv: addi r6,r6,1 /* Increment */ |
| cmpw r6,r9 /* Are we done? */ |
| bne 1b /* If not, repeat */ |
| |
| /* Invalidate TLB0 */ |
| li r6,0x04 |
| tlbivax 0,r6 |
| #ifdef CONFIG_SMP |
| tlbsync |
| #endif |
| /* Invalidate TLB1 */ |
| li r6,0x0c |
| tlbivax 0,r6 |
| #ifdef CONFIG_SMP |
| tlbsync |
| #endif |
| msync |
| |
| /* 3. Setup a temp mapping and jump to it */ |
| andi. r5, r3, 0x1 /* Find an entry not used and is non-zero */ |
| addi r5, r5, 0x1 |
| lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ |
| mtspr SPRN_MAS0,r7 |
| tlbre |
| |
| /* Just modify the entry ID and EPN for the temp mapping */ |
| lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */ |
| mtspr SPRN_MAS0,r7 |
| xori r6,r4,1 /* Setup TMP mapping in the other Address space */ |
| slwi r6,r6,12 |
| oris r6,r6,(MAS1_VALID|MAS1_IPROT)@h |
| ori r6,r6,(MAS1_TSIZE(BOOKE_PAGESZ_4K))@l |
| mtspr SPRN_MAS1,r6 |
| mfspr r6,SPRN_MAS2 |
| li r7,0 /* temp EPN = 0 */ |
| rlwimi r7,r6,0,20,31 |
| mtspr SPRN_MAS2,r7 |
| tlbwe |
| |
| xori r6,r4,1 |
| slwi r6,r6,5 /* setup new context with other address space */ |
| bl 1f /* Find our address */ |
| 1: mflr r9 |
| rlwimi r7,r9,0,20,31 |
| addi r7,r7,24 |
| mtspr SPRN_SRR0,r7 |
| mtspr SPRN_SRR1,r6 |
| rfi |
| |
| /* 4. Clear out PIDs & Search info */ |
| li r6,0 |
| mtspr SPRN_PID0,r6 |
| #ifndef CONFIG_E200 |
| mtspr SPRN_PID1,r6 |
| mtspr SPRN_PID2,r6 |
| #endif |
| mtspr SPRN_MAS6,r6 |
| |
| /* 5. Invalidate mapping we started in */ |
| lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ |
| mtspr SPRN_MAS0,r7 |
| tlbre |
| li r6,0 |
| mtspr SPRN_MAS1,r6 |
| tlbwe |
| /* Invalidate TLB1 */ |
| li r9,0x0c |
| tlbivax 0,r9 |
| #ifdef CONFIG_SMP |
| tlbsync |
| #endif |
| msync |
| |
| /* 6. Setup KERNELBASE mapping in TLB1[0] */ |
| lis r6,0x1000 /* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */ |
| mtspr SPRN_MAS0,r6 |
| lis r6,(MAS1_VALID|MAS1_IPROT)@h |
| ori r6,r6,(MAS1_TSIZE(BOOKE_PAGESZ_16M))@l |
| mtspr SPRN_MAS1,r6 |
| li r7,0 |
| lis r6,KERNELBASE@h |
| ori r6,r6,KERNELBASE@l |
| rlwimi r6,r7,0,20,31 |
| mtspr SPRN_MAS2,r6 |
| li r7,(MAS3_SX|MAS3_SW|MAS3_SR) |
| mtspr SPRN_MAS3,r7 |
| tlbwe |
| |
| /* 7. Jump to KERNELBASE mapping */ |
| lis r7,MSR_KERNEL@h |
| ori r7,r7,MSR_KERNEL@l |
| bl 1f /* Find our address */ |
| 1: mflr r9 |
| rlwimi r6,r9,0,20,31 |
| addi r6,r6,24 |
| mtspr SPRN_SRR0,r6 |
| mtspr SPRN_SRR1,r7 |
| rfi /* start execution out of TLB1[0] entry */ |
| |
| /* 8. Clear out the temp mapping */ |
| lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */ |
| mtspr SPRN_MAS0,r7 |
| tlbre |
| mtspr SPRN_MAS1,r8 |
| tlbwe |
| /* Invalidate TLB1 */ |
| li r9,0x0c |
| tlbivax 0,r9 |
| #ifdef CONFIG_SMP |
| tlbsync |
| #endif |
| msync |
| |
| /* 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, Debug); |
| SET_IVOR(32, SPEUnavailable); |
| SET_IVOR(33, SPEFloatingPointData); |
| SET_IVOR(34, SPEFloatingPointRound); |
| #ifndef CONFIG_E200 |
| SET_IVOR(35, PerformanceMonitor); |
| #endif |
| |
| /* 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(BOOKE_PAGESZ_4K))@l |
| #ifdef CONFIG_E200 |
| oris r2,r2,MAS4_TLBSELD(1)@h |
| #endif |
| mtspr SPRN_MAS4, r2 |
| |
| #if 0 |
| /* Enable DOZE */ |
| mfspr r2,SPRN_HID0 |
| oris r2,r2,HID0_DOZE@h |
| mtspr SPRN_HID0, r2 |
| #endif |
| #ifdef CONFIG_E200 |
| /* enable dedicated debug exception handling resources (Debug APU) */ |
| mfspr r2,SPRN_HID0 |
| ori r2,r2,HID0_DAPUEN@l |
| mtspr SPRN_HID0,r2 |
| #endif |
| |
| #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 |
| /* clear any residual debug events */ |
| li r2,-1 |
| mtspr SPRN_DBSR,r2 |
| #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_SPRG3,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) |
| |
| bl early_init |
| |
| mfspr r3,SPRN_TLB1CFG |
| andi. r3,r3,0xfff |
| lis r4,num_tlbcam_entries@ha |
| stw r3,num_tlbcam_entries@l(r4) |
| /* |
| * Decide what sort of machine this is and initialize the MMU. |
| */ |
| mr r3,r31 |
| mr r4,r30 |
| mr r5,r29 |
| mr r6,r28 |
| mr r7,r27 |
| 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 r4, KERNELBASE@h |
| ori r4, r4, KERNELBASE@l |
| 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 |
| */ |
| #ifdef CONFIG_PTE_64BIT |
| #define PTE_FLAGS_OFFSET 4 |
| #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 */ |
| #else |
| #define PTE_FLAGS_OFFSET 0 |
| #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, CriticalInput, UnknownException) |
| |
| /* Machine Check Interrupt */ |
| #ifdef CONFIG_E200 |
| /* no RFMCI, MCSRRs on E200 */ |
| CRITICAL_EXCEPTION(0x0200, MachineCheck, MachineCheckException) |
| #else |
| MCHECK_EXCEPTION(0x0200, MachineCheck, MachineCheckException) |
| #endif |
| |
| /* Data Storage Interrupt */ |
| START_EXCEPTION(DataStorage) |
| mtspr SPRN_SPRG0, r10 /* Save some working registers */ |
| mtspr SPRN_SPRG1, r11 |
| mtspr SPRN_SPRG4W, r12 |
| mtspr SPRN_SPRG5W, r13 |
| mfcr r11 |
| mtspr SPRN_SPRG7W, r11 |
| |
| /* |
| * Check if it was a store fault, if not then bail |
| * because a user tried to access a kernel or |
| * read-protected page. Otherwise, get the |
| * offending address and handle it. |
| */ |
| mfspr r10, SPRN_ESR |
| andis. r10, r10, ESR_ST@h |
| beq 2f |
| |
| mfspr r10, SPRN_DEAR /* Get faulting address */ |
| |
| /* If we are faulting a kernel address, we have to use the |
| * kernel page tables. |
| */ |
| lis r11, TASK_SIZE@h |
| ori r11, r11, TASK_SIZE@l |
| cmplw 0, r10, r11 |
| bge 2f |
| |
| /* Get the PGD for the current thread */ |
| 3: |
| mfspr r11,SPRN_SPRG3 |
| lwz r11,PGDIR(r11) |
| 4: |
| FIND_PTE |
| |
| /* Are _PAGE_USER & _PAGE_RW set & _PAGE_HWWRITE not? */ |
| andi. r13, r11, _PAGE_RW|_PAGE_USER|_PAGE_HWWRITE |
| cmpwi 0, r13, _PAGE_RW|_PAGE_USER |
| bne 2f /* Bail if not */ |
| |
| /* Update 'changed'. */ |
| ori r11, r11, _PAGE_DIRTY|_PAGE_ACCESSED|_PAGE_HWWRITE |
| stw r11, PTE_FLAGS_OFFSET(r12) /* Update Linux page table */ |
| |
| /* MAS2 not updated as the entry does exist in the tlb, this |
| fault taken to detect state transition (eg: COW -> DIRTY) |
| */ |
| andi. r11, r11, _PAGE_HWEXEC |
| rlwimi r11, r11, 31, 27, 27 /* SX <- _PAGE_HWEXEC */ |
| ori r11, r11, (MAS3_UW|MAS3_SW|MAS3_UR|MAS3_SR)@l /* set static perms */ |
| |
| /* update search PID in MAS6, AS = 0 */ |
| mfspr r12, SPRN_PID0 |
| slwi r12, r12, 16 |
| mtspr SPRN_MAS6, r12 |
| |
| /* find the TLB index that caused the fault. It has to be here. */ |
| tlbsx 0, r10 |
| |
| /* only update the perm bits, assume the RPN is fine */ |
| mfspr r12, SPRN_MAS3 |
| rlwimi r12, r11, 0, 20, 31 |
| mtspr SPRN_MAS3,r12 |
| tlbwe |
| |
| /* Done...restore registers and get out of here. */ |
| mfspr r11, SPRN_SPRG7R |
| mtcr r11 |
| mfspr r13, SPRN_SPRG5R |
| mfspr r12, SPRN_SPRG4R |
| mfspr r11, SPRN_SPRG1 |
| mfspr r10, SPRN_SPRG0 |
| rfi /* Force context change */ |
| |
| 2: |
| /* |
| * The bailout. Restore registers to pre-exception conditions |
| * and call the heavyweights to help us out. |
| */ |
| mfspr r11, SPRN_SPRG7R |
| mtcr r11 |
| mfspr r13, SPRN_SPRG5R |
| mfspr r12, SPRN_SPRG4R |
| mfspr r11, SPRN_SPRG1 |
| mfspr r10, SPRN_SPRG0 |
| b data_access |
| |
| /* Instruction Storage Interrupt */ |
| INSTRUCTION_STORAGE_EXCEPTION |
| |
| /* External Input Interrupt */ |
| EXCEPTION(0x0500, 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 |
| #ifdef CONFIG_E200 |
| /* E200 treats 'normal' floating point instructions as FP Unavail exception */ |
| EXCEPTION(0x0800, FloatingPointUnavailable, ProgramCheckException, EXC_XFER_EE) |
| #else |
| EXCEPTION(0x0800, FloatingPointUnavailable, UnknownException, EXC_XFER_EE) |
| #endif |
| #endif |
| |
| /* System Call Interrupt */ |
| START_EXCEPTION(SystemCall) |
| NORMAL_EXCEPTION_PROLOG |
| EXC_XFER_EE_LITE(0x0c00, DoSyscall) |
| |
| /* Auxillary Processor Unavailable Interrupt */ |
| EXCEPTION(0x2900, AuxillaryProcessorUnavailable, UnknownException, EXC_XFER_EE) |
| |
| /* Decrementer Interrupt */ |
| DECREMENTER_EXCEPTION |
| |
| /* Fixed Internal Timer Interrupt */ |
| /* TODO: Add FIT support */ |
| EXCEPTION(0x3100, FixedIntervalTimer, UnknownException, EXC_XFER_EE) |
| |
| /* Watchdog Timer Interrupt */ |
| #ifdef CONFIG_BOOKE_WDT |
| CRITICAL_EXCEPTION(0x3200, WatchdogTimer, WatchdogException) |
| #else |
| CRITICAL_EXCEPTION(0x3200, WatchdogTimer, UnknownException) |
| #endif |
| |
| /* Data TLB Error Interrupt */ |
| START_EXCEPTION(DataTLBError) |
| mtspr SPRN_SPRG0, r10 /* Save some working registers */ |
| mtspr SPRN_SPRG1, r11 |
| mtspr SPRN_SPRG4W, r12 |
| mtspr SPRN_SPRG5W, r13 |
| mfcr r11 |
| mtspr SPRN_SPRG7W, r11 |
| mfspr r10, SPRN_DEAR /* Get faulting address */ |
| |
| /* If we are faulting a kernel address, we have to use the |
| * kernel page tables. |
| */ |
| lis r11, TASK_SIZE@h |
| ori r11, r11, TASK_SIZE@l |
| 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_SPRG3 |
| lwz r11,PGDIR(r11) |
| |
| 4: |
| FIND_PTE |
| andi. r13, r11, _PAGE_PRESENT /* Is the page present? */ |
| beq 2f /* Bail if not present */ |
| |
| #ifdef CONFIG_PTE_64BIT |
| lwz r13, 0(r12) |
| #endif |
| ori r11, r11, _PAGE_ACCESSED |
| stw r11, PTE_FLAGS_OFFSET(r12) |
| |
| /* 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 r11, SPRN_SPRG7R |
| mtcr r11 |
| mfspr r13, SPRN_SPRG5R |
| mfspr r12, SPRN_SPRG4R |
| mfspr r11, SPRN_SPRG1 |
| mfspr r10, SPRN_SPRG0 |
| b data_access |
| |
| /* 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_SPRG0, r10 /* Save some working registers */ |
| mtspr SPRN_SPRG1, r11 |
| mtspr SPRN_SPRG4W, r12 |
| mtspr SPRN_SPRG5W, r13 |
| mfcr r11 |
| mtspr SPRN_SPRG7W, r11 |
| mfspr r10, SPRN_SRR0 /* Get faulting address */ |
| |
| /* If we are faulting a kernel address, we have to use the |
| * kernel page tables. |
| */ |
| lis r11, TASK_SIZE@h |
| ori r11, r11, TASK_SIZE@l |
| 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_SPRG3 |
| lwz r11,PGDIR(r11) |
| |
| 4: |
| FIND_PTE |
| andi. r13, r11, _PAGE_PRESENT /* Is the page present? */ |
| beq 2f /* Bail if not present */ |
| |
| #ifdef CONFIG_PTE_64BIT |
| lwz r13, 0(r12) |
| #endif |
| ori r11, r11, _PAGE_ACCESSED |
| stw r11, PTE_FLAGS_OFFSET(r12) |
| |
| /* 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 r11, SPRN_SPRG7R |
| mtcr r11 |
| mfspr r13, SPRN_SPRG5R |
| mfspr r12, SPRN_SPRG4R |
| mfspr r11, SPRN_SPRG1 |
| mfspr r10, SPRN_SPRG0 |
| b InstructionStorage |
| |
| #ifdef CONFIG_SPE |
| /* SPE Unavailable */ |
| START_EXCEPTION(SPEUnavailable) |
| NORMAL_EXCEPTION_PROLOG |
| bne load_up_spe |
| addi r3,r1,STACK_FRAME_OVERHEAD |
| EXC_XFER_EE_LITE(0x2010, KernelSPE) |
| #else |
| EXCEPTION(0x2020, SPEUnavailable, UnknownException, EXC_XFER_EE) |
| #endif /* CONFIG_SPE */ |
| |
| /* SPE Floating Point Data */ |
| #ifdef CONFIG_SPE |
| EXCEPTION(0x2030, SPEFloatingPointData, SPEFloatingPointException, EXC_XFER_EE); |
| #else |
| EXCEPTION(0x2040, SPEFloatingPointData, UnknownException, EXC_XFER_EE) |
| #endif /* CONFIG_SPE */ |
| |
| /* SPE Floating Point Round */ |
| EXCEPTION(0x2050, SPEFloatingPointRound, UnknownException, EXC_XFER_EE) |
| |
| /* Performance Monitor */ |
| EXCEPTION(0x2060, PerformanceMonitor, PerformanceMonitorException, EXC_XFER_STD) |
| |
| |
| /* Debug Interrupt */ |
| DEBUG_EXCEPTION |
| |
| /* |
| * Local functions |
| */ |
| |
| /* |
| * Data TLB exceptions will bail out to this point |
| * if they can't resolve the lightweight TLB fault. |
| */ |
| data_access: |
| NORMAL_EXCEPTION_PROLOG |
| 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 |
| EXC_XFER_EE_LITE(0x0300, handle_page_fault) |
| 1: |
| addi r3,r1,STACK_FRAME_OVERHEAD |
| EXC_XFER_EE_LITE(0x0300, CacheLockingException) |
| |
| /* |
| |
| * Both the instruction and data TLB miss get to this |
| * point to load the TLB. |
| * r10 - EA of fault |
| * r11 - TLB (info from Linux PTE) |
| * r12, r13 - available to use |
| * CR5 - results of addr < TASK_SIZE |
| * 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: |
| /* |
| * 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. |
| */ |
| |
| mfspr r12, SPRN_MAS2 |
| #ifdef CONFIG_PTE_64BIT |
| rlwimi r12, r11, 26, 24, 31 /* extract ...WIMGE from pte */ |
| #else |
| rlwimi r12, r11, 26, 27, 31 /* extract WIMGE from pte */ |
| #endif |
| mtspr SPRN_MAS2, r12 |
| |
| bge 5, 1f |
| |
| /* is user addr */ |
| andi. r12, r11, (_PAGE_USER | _PAGE_HWWRITE | _PAGE_HWEXEC) |
| andi. r10, r11, _PAGE_USER /* Test for _PAGE_USER */ |
| srwi r10, r12, 1 |
| or r12, r12, r10 /* Copy user perms into supervisor */ |
| iseleq r12, 0, r12 |
| b 2f |
| |
| /* is kernel addr */ |
| 1: rlwinm r12, r11, 31, 29, 29 /* Extract _PAGE_HWWRITE into SW */ |
| ori r12, r12, (MAS3_SX | MAS3_SR) |
| |
| #ifdef CONFIG_PTE_64BIT |
| 2: rlwimi r12, r13, 24, 0, 7 /* grab RPN[32:39] */ |
| rlwimi r12, r11, 24, 8, 19 /* grab RPN[40:51] */ |
| mtspr SPRN_MAS3, r12 |
| BEGIN_FTR_SECTION |
| srwi r10, r13, 8 /* grab RPN[8:31] */ |
| mtspr SPRN_MAS7, r10 |
| END_FTR_SECTION_IFSET(CPU_FTR_BIG_PHYS) |
| #else |
| 2: rlwimi r11, r12, 0, 20, 31 /* Extract RPN from PTE and merge with perms */ |
| mtspr SPRN_MAS3, r11 |
| #endif |
| #ifdef CONFIG_E200 |
| /* Round robin TLB1 entries assignment */ |
| mfspr r12, SPRN_MAS0 |
| |
| /* Extract TLB1CFG(NENTRY) */ |
| mfspr r11, SPRN_TLB1CFG |
| andi. r11, r11, 0xfff |
| |
| /* Extract MAS0(NV) */ |
| andi. r13, r12, 0xfff |
| addi r13, r13, 1 |
| cmpw 0, r13, r11 |
| addi r12, r12, 1 |
| |
| /* check if we need to wrap */ |
| blt 7f |
| |
| /* wrap back to first free tlbcam entry */ |
| lis r13, tlbcam_index@ha |
| lwz r13, tlbcam_index@l(r13) |
| rlwimi r12, r13, 0, 20, 31 |
| 7: |
| mtspr SPRN_MAS0,r12 |
| #endif /* CONFIG_E200 */ |
| |
| tlbwe |
| |
| /* Done...restore registers and get out of here. */ |
| mfspr r11, SPRN_SPRG7R |
| mtcr r11 |
| mfspr r13, SPRN_SPRG5R |
| mfspr r12, SPRN_SPRG4R |
| mfspr r11, SPRN_SPRG1 |
| mfspr r10, SPRN_SPRG0 |
| 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! */ |
| 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 |
| /* |
| * For SMP, we don't do lazy SPE switching because it just gets too |
| * horrendously complex, especially when a task switches from one CPU |
| * to another. Instead we call giveup_spe in switch_to. |
| */ |
| #ifndef CONFIG_SMP |
| lis r3,last_task_used_spe@ha |
| lwz r4,last_task_used_spe@l(r3) |
| cmpi 0,r4,0 |
| beq 1f |
| addi r4,r4,THREAD /* want THREAD of last_task_used_spe */ |
| SAVE_32EVR(0,r10,r4) |
| evxor evr10, evr10, evr10 /* clear out evr10 */ |
| evmwumiaa evr10, evr10, evr10 /* evr10 <- ACC = 0 * 0 + ACC */ |
| li r5,THREAD_ACC |
| evstddx evr10, r4, r5 /* save off accumulator */ |
| lwz r5,PT_REGS(r4) |
| lwz r4,_MSR-STACK_FRAME_OVERHEAD(r5) |
| lis r10,MSR_SPE@h |
| andc r4,r4,r10 /* disable SPE for previous task */ |
| stw r4,_MSR-STACK_FRAME_OVERHEAD(r5) |
| 1: |
| #endif /* CONFIG_SMP */ |
| /* enable use of SPE after return */ |
| oris r9,r9,MSR_SPE@h |
| mfspr r5,SPRN_SPRG3 /* 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_32EVR(0,r10,r5) |
| #ifndef CONFIG_SMP |
| subi r4,r5,THREAD |
| stw r4,last_task_used_spe@l(r3) |
| #endif /* CONFIG_SMP */ |
| /* restore registers and return */ |
| 2: REST_4GPRS(3, r11) |
| lwz r10,_CCR(r11) |
| REST_GPR(1, r11) |
| mtcr r10 |
| lwz r10,_LINK(r11) |
| mtlr r10 |
| REST_GPR(10, r11) |
| mtspr SPRN_SRR1,r9 |
| mtspr SPRN_SRR0,r12 |
| REST_GPR(9, r11) |
| REST_GPR(12, r11) |
| lwz r11,GPR11(r11) |
| SYNC |
| rfi |
| |
| /* |
| * 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 */ |
| lis r3,87f@h |
| ori r3,r3,87f@l |
| mr r4,r2 /* current */ |
| lwz r5,_NIP(r1) |
| bl printk |
| b ret_from_except |
| 87: .string "SPE used in kernel (task=%p, pc=%x) \n" |
| .align 4,0 |
| |
| #endif /* CONFIG_SPE */ |
| |
| /* |
| * Global functions |
| */ |
| |
| /* |
| * extern void loadcam_entry(unsigned int index) |
| * |
| * Load TLBCAM[index] entry in to the L2 CAM MMU |
| */ |
| _GLOBAL(loadcam_entry) |
| lis r4,TLBCAM@ha |
| addi r4,r4,TLBCAM@l |
| mulli r5,r3,20 |
| add r3,r5,r4 |
| lwz r4,0(r3) |
| mtspr SPRN_MAS0,r4 |
| lwz r4,4(r3) |
| mtspr SPRN_MAS1,r4 |
| lwz r4,8(r3) |
| mtspr SPRN_MAS2,r4 |
| lwz r4,12(r3) |
| mtspr SPRN_MAS3,r4 |
| tlbwe |
| isync |
| blr |
| |
| /* |
| * extern void giveup_altivec(struct task_struct *prev) |
| * |
| * The e500 core does not have an AltiVec unit. |
| */ |
| _GLOBAL(giveup_altivec) |
| blr |
| |
| #ifdef CONFIG_SPE |
| /* |
| * extern void giveup_spe(struct task_struct *prev) |
| * |
| */ |
| _GLOBAL(giveup_spe) |
| mfmsr r5 |
| oris r5,r5,MSR_SPE@h |
| SYNC |
| mtmsr r5 /* enable use of SPE now */ |
| isync |
| cmpi 0,r3,0 |
| beqlr- /* if no previous owner, done */ |
| addi r3,r3,THREAD /* want THREAD of task */ |
| lwz r5,PT_REGS(r3) |
| cmpi 0,r5,0 |
| SAVE_32EVR(0, r4, r3) |
| 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 */ |
| mfspr r6,SPRN_SPEFSCR |
| stw r6,THREAD_SPEFSCR(r3) /* save spefscr register value */ |
| 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: |
| #ifndef CONFIG_SMP |
| li r5,0 |
| lis r4,last_task_used_spe@ha |
| stw r5,last_task_used_spe@l(r4) |
| #endif /* CONFIG_SMP */ |
| blr |
| #endif /* CONFIG_SPE */ |
| |
| /* |
| * extern void giveup_fpu(struct task_struct *prev) |
| * |
| * Not all FSL Book-E cores have an FPU |
| */ |
| #ifndef CONFIG_PPC_FPU |
| _GLOBAL(giveup_fpu) |
| blr |
| #endif |
| |
| /* |
| * 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 */ |
| mfmsr r13 |
| ori r13,r13,MSR_DE@l /* Enable Debug Events */ |
| mtmsr r13 |
| mfspr r13,SPRN_DBCR0 |
| lis r13,(DBCR0_IDM|DBCR0_RST_CHIP)@h |
| mtspr SPRN_DBCR0,r13 |
| |
| _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 |
| |
| /* |
| * 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 |
| _GLOBAL(sdata) |
| _GLOBAL(empty_zero_page) |
| .space 4096 |
| _GLOBAL(swapper_pg_dir) |
| .space 4096 |
| |
| /* Reserved 4k for the critical exception stack & 4k for the machine |
| * check stack per CPU for kernel mode exceptions */ |
| .section .bss |
| .align 12 |
| exception_stack_bottom: |
| .space BOOKE_EXCEPTION_STACK_SIZE * NR_CPUS |
| _GLOBAL(exception_stack_top) |
| |
| /* |
| * This space gets a copy of optional info passed to us by the bootstrap |
| * which is used to pass parameters into the kernel like root=/dev/sda1, etc. |
| */ |
| _GLOBAL(cmd_line) |
| .space 512 |
| |
| /* |
| * Room for two PTE pointers, usually the kernel and current user pointers |
| * to their respective root page table. |
| */ |
| abatron_pteptrs: |
| .space 8 |
| |
