1013 lines
30 KiB
ArmAsm
1013 lines
30 KiB
ArmAsm
/*
|
|
* 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>
|
|
* Low-level exception handlers and MMU support
|
|
* rewritten by Paul Mackerras.
|
|
* Copyright (C) 1996 Paul Mackerras.
|
|
* MPC8xx modifications by Dan Malek
|
|
* Copyright (C) 1997 Dan Malek (dmalek@jlc.net).
|
|
*
|
|
* This file contains low-level support and setup for PowerPC 8xx
|
|
* embedded processors, including trap and interrupt dispatch.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/page.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/ppc_asm.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/export.h>
|
|
|
|
/* Macro to make the code more readable. */
|
|
#ifdef CONFIG_8xx_CPU6
|
|
#define SPRN_MI_TWC_ADDR 0x2b80
|
|
#define SPRN_MI_RPN_ADDR 0x2d80
|
|
#define SPRN_MD_TWC_ADDR 0x3b80
|
|
#define SPRN_MD_RPN_ADDR 0x3d80
|
|
|
|
#define MTSPR_CPU6(spr, reg, treg) \
|
|
li treg, spr##_ADDR; \
|
|
stw treg, 12(r0); \
|
|
lwz treg, 12(r0); \
|
|
mtspr spr, reg
|
|
#else
|
|
#define MTSPR_CPU6(spr, reg, treg) \
|
|
mtspr spr, reg
|
|
#endif
|
|
|
|
/* Macro to test if an address is a kernel address */
|
|
#if CONFIG_TASK_SIZE <= 0x80000000 && CONFIG_PAGE_OFFSET >= 0x80000000
|
|
#define IS_KERNEL(tmp, addr) \
|
|
andis. tmp, addr, 0x8000 /* Address >= 0x80000000 */
|
|
#define BRANCH_UNLESS_KERNEL(label) beq label
|
|
#else
|
|
#define IS_KERNEL(tmp, addr) \
|
|
rlwinm tmp, addr, 16, 16, 31; \
|
|
cmpli cr0, tmp, PAGE_OFFSET >> 16
|
|
#define BRANCH_UNLESS_KERNEL(label) blt label
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Value for the bits that have fixed value in RPN entries.
|
|
* Also used for tagging DAR for DTLBerror.
|
|
*/
|
|
#ifdef CONFIG_PPC_16K_PAGES
|
|
#define RPN_PATTERN (0x00f0 | MD_SPS16K)
|
|
#else
|
|
#define RPN_PATTERN 0x00f0
|
|
#endif
|
|
|
|
#define PAGE_SHIFT_512K 19
|
|
#define PAGE_SHIFT_8M 23
|
|
|
|
__HEAD
|
|
_ENTRY(_stext);
|
|
_ENTRY(_start);
|
|
|
|
/* MPC8xx
|
|
* This port was done on an MBX board with an 860. Right now I only
|
|
* support an ELF compressed (zImage) boot from EPPC-Bug because the
|
|
* code there loads up some registers before calling us:
|
|
* r3: ptr to board info 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
|
|
*
|
|
* I decided to use conditional compilation instead of checking PVR and
|
|
* adding more processor specific branches around code I don't need.
|
|
* Since this is an embedded processor, I also appreciate any memory
|
|
* savings I can get.
|
|
*
|
|
* The MPC8xx does not have any BATs, but it supports large page sizes.
|
|
* We first initialize the MMU to support 8M byte pages, then load one
|
|
* entry into each of the instruction and data TLBs to map the first
|
|
* 8M 1:1. I also mapped an additional I/O space 1:1 so we can get to
|
|
* the "internal" processor registers before MMU_init is called.
|
|
*
|
|
* -- Dan
|
|
*/
|
|
.globl __start
|
|
__start:
|
|
mr r31,r3 /* save device tree ptr */
|
|
|
|
/* We have to turn on the MMU right away so we get cache modes
|
|
* set correctly.
|
|
*/
|
|
bl initial_mmu
|
|
|
|
/* We now have the lower 8 Meg mapped into TLB entries, and the caches
|
|
* ready to work.
|
|
*/
|
|
|
|
turn_on_mmu:
|
|
mfmsr r0
|
|
ori r0,r0,MSR_DR|MSR_IR
|
|
mtspr SPRN_SRR1,r0
|
|
lis r0,start_here@h
|
|
ori r0,r0,start_here@l
|
|
mtspr SPRN_SRR0,r0
|
|
SYNC
|
|
rfi /* enables MMU */
|
|
|
|
/*
|
|
* Exception entry code. This code runs with address translation
|
|
* turned off, i.e. using physical addresses.
|
|
* We assume sprg3 has the physical address of the current
|
|
* task's thread_struct.
|
|
*/
|
|
#define EXCEPTION_PROLOG \
|
|
EXCEPTION_PROLOG_0; \
|
|
mfcr r10; \
|
|
EXCEPTION_PROLOG_1; \
|
|
EXCEPTION_PROLOG_2
|
|
|
|
#define EXCEPTION_PROLOG_0 \
|
|
mtspr SPRN_SPRG_SCRATCH0,r10; \
|
|
mtspr SPRN_SPRG_SCRATCH1,r11
|
|
|
|
#define EXCEPTION_PROLOG_1 \
|
|
mfspr r11,SPRN_SRR1; /* check whether user or kernel */ \
|
|
andi. r11,r11,MSR_PR; \
|
|
tophys(r11,r1); /* use tophys(r1) if kernel */ \
|
|
beq 1f; \
|
|
mfspr r11,SPRN_SPRG_THREAD; \
|
|
lwz r11,THREAD_INFO-THREAD(r11); \
|
|
addi r11,r11,THREAD_SIZE; \
|
|
tophys(r11,r11); \
|
|
1: subi r11,r11,INT_FRAME_SIZE /* alloc exc. frame */
|
|
|
|
|
|
#define EXCEPTION_PROLOG_2 \
|
|
stw r10,_CCR(r11); /* save registers */ \
|
|
stw r12,GPR12(r11); \
|
|
stw r9,GPR9(r11); \
|
|
mfspr r10,SPRN_SPRG_SCRATCH0; \
|
|
stw r10,GPR10(r11); \
|
|
mfspr r12,SPRN_SPRG_SCRATCH1; \
|
|
stw r12,GPR11(r11); \
|
|
mflr r10; \
|
|
stw r10,_LINK(r11); \
|
|
mfspr r12,SPRN_SRR0; \
|
|
mfspr r9,SPRN_SRR1; \
|
|
stw r1,GPR1(r11); \
|
|
stw r1,0(r11); \
|
|
tovirt(r1,r11); /* set new kernel sp */ \
|
|
li r10,MSR_KERNEL & ~(MSR_IR|MSR_DR); /* can take exceptions */ \
|
|
MTMSRD(r10); /* (except for mach check in rtas) */ \
|
|
stw r0,GPR0(r11); \
|
|
SAVE_4GPRS(3, r11); \
|
|
SAVE_2GPRS(7, r11)
|
|
|
|
/*
|
|
* Exception exit code.
|
|
*/
|
|
#define EXCEPTION_EPILOG_0 \
|
|
mfspr r10,SPRN_SPRG_SCRATCH0; \
|
|
mfspr r11,SPRN_SPRG_SCRATCH1
|
|
|
|
/*
|
|
* Note: code which follows this uses cr0.eq (set if from kernel),
|
|
* r11, r12 (SRR0), and r9 (SRR1).
|
|
*
|
|
* Note2: once we have set r1 we are in a position to take exceptions
|
|
* again, and we could thus set MSR:RI at that point.
|
|
*/
|
|
|
|
/*
|
|
* Exception vectors.
|
|
*/
|
|
#define EXCEPTION(n, label, hdlr, xfer) \
|
|
. = n; \
|
|
label: \
|
|
EXCEPTION_PROLOG; \
|
|
addi r3,r1,STACK_FRAME_OVERHEAD; \
|
|
xfer(n, hdlr)
|
|
|
|
#define EXC_XFER_TEMPLATE(n, hdlr, trap, copyee, tfer, ret) \
|
|
li r10,trap; \
|
|
stw r10,_TRAP(r11); \
|
|
li r10,MSR_KERNEL; \
|
|
copyee(r10, r9); \
|
|
bl tfer; \
|
|
i##n: \
|
|
.long hdlr; \
|
|
.long ret
|
|
|
|
#define COPY_EE(d, s) rlwimi d,s,0,16,16
|
|
#define NOCOPY(d, s)
|
|
|
|
#define EXC_XFER_STD(n, hdlr) \
|
|
EXC_XFER_TEMPLATE(n, hdlr, n, NOCOPY, transfer_to_handler_full, \
|
|
ret_from_except_full)
|
|
|
|
#define EXC_XFER_LITE(n, hdlr) \
|
|
EXC_XFER_TEMPLATE(n, hdlr, n+1, NOCOPY, transfer_to_handler, \
|
|
ret_from_except)
|
|
|
|
#define EXC_XFER_EE(n, hdlr) \
|
|
EXC_XFER_TEMPLATE(n, hdlr, n, COPY_EE, transfer_to_handler_full, \
|
|
ret_from_except_full)
|
|
|
|
#define EXC_XFER_EE_LITE(n, hdlr) \
|
|
EXC_XFER_TEMPLATE(n, hdlr, n+1, COPY_EE, transfer_to_handler, \
|
|
ret_from_except)
|
|
|
|
/* System reset */
|
|
EXCEPTION(0x100, Reset, system_reset_exception, EXC_XFER_STD)
|
|
|
|
/* Machine check */
|
|
. = 0x200
|
|
MachineCheck:
|
|
EXCEPTION_PROLOG
|
|
mfspr r4,SPRN_DAR
|
|
stw r4,_DAR(r11)
|
|
li r5,RPN_PATTERN
|
|
mtspr SPRN_DAR,r5 /* Tag DAR, to be used in DTLB Error */
|
|
mfspr r5,SPRN_DSISR
|
|
stw r5,_DSISR(r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
EXC_XFER_STD(0x200, machine_check_exception)
|
|
|
|
/* Data access exception.
|
|
* This is "never generated" by the MPC8xx.
|
|
*/
|
|
. = 0x300
|
|
DataAccess:
|
|
|
|
/* Instruction access exception.
|
|
* This is "never generated" by the MPC8xx.
|
|
*/
|
|
. = 0x400
|
|
InstructionAccess:
|
|
|
|
/* External interrupt */
|
|
EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
|
|
|
|
/* Alignment exception */
|
|
. = 0x600
|
|
Alignment:
|
|
EXCEPTION_PROLOG
|
|
mfspr r4,SPRN_DAR
|
|
stw r4,_DAR(r11)
|
|
li r5,RPN_PATTERN
|
|
mtspr SPRN_DAR,r5 /* Tag DAR, to be used in DTLB Error */
|
|
mfspr r5,SPRN_DSISR
|
|
stw r5,_DSISR(r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
EXC_XFER_EE(0x600, alignment_exception)
|
|
|
|
/* Program check exception */
|
|
EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
|
|
|
|
/* No FPU on MPC8xx. This exception is not supposed to happen.
|
|
*/
|
|
EXCEPTION(0x800, FPUnavailable, unknown_exception, EXC_XFER_STD)
|
|
|
|
/* Decrementer */
|
|
EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE)
|
|
|
|
EXCEPTION(0xa00, Trap_0a, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0xb00, Trap_0b, unknown_exception, EXC_XFER_EE)
|
|
|
|
/* System call */
|
|
. = 0xc00
|
|
SystemCall:
|
|
EXCEPTION_PROLOG
|
|
EXC_XFER_EE_LITE(0xc00, DoSyscall)
|
|
|
|
/* Single step - not used on 601 */
|
|
EXCEPTION(0xd00, SingleStep, single_step_exception, EXC_XFER_STD)
|
|
EXCEPTION(0xe00, Trap_0e, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0xf00, Trap_0f, unknown_exception, EXC_XFER_EE)
|
|
|
|
/* On the MPC8xx, this is a software emulation interrupt. It occurs
|
|
* for all unimplemented and illegal instructions.
|
|
*/
|
|
EXCEPTION(0x1000, SoftEmu, SoftwareEmulation, EXC_XFER_STD)
|
|
|
|
. = 0x1100
|
|
/*
|
|
* For the MPC8xx, this is a software tablewalk to load the instruction
|
|
* TLB. The task switch loads the M_TW register with the pointer to the first
|
|
* level table.
|
|
* If we discover there is no second level table (value is zero) or if there
|
|
* is an invalid pte, we load that into the TLB, which causes another fault
|
|
* into the TLB Error interrupt where we can handle such problems.
|
|
* We have to use the MD_xxx registers for the tablewalk because the
|
|
* equivalent MI_xxx registers only perform the attribute functions.
|
|
*/
|
|
|
|
#ifdef CONFIG_8xx_CPU15
|
|
#define INVALIDATE_ADJACENT_PAGES_CPU15(tmp, addr) \
|
|
addi tmp, addr, PAGE_SIZE; \
|
|
tlbie tmp; \
|
|
addi tmp, addr, -PAGE_SIZE; \
|
|
tlbie tmp
|
|
#else
|
|
#define INVALIDATE_ADJACENT_PAGES_CPU15(tmp, addr)
|
|
#endif
|
|
|
|
InstructionTLBMiss:
|
|
#if defined(CONFIG_8xx_CPU6) || defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC) || defined (CONFIG_HUGETLB_PAGE)
|
|
mtspr SPRN_SPRG_SCRATCH2, r3
|
|
#endif
|
|
EXCEPTION_PROLOG_0
|
|
|
|
/* If we are faulting a kernel address, we have to use the
|
|
* kernel page tables.
|
|
*/
|
|
mfspr r10, SPRN_SRR0 /* Get effective address of fault */
|
|
INVALIDATE_ADJACENT_PAGES_CPU15(r11, r10)
|
|
/* Only modules will cause ITLB Misses as we always
|
|
* pin the first 8MB of kernel memory */
|
|
#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC) || defined (CONFIG_HUGETLB_PAGE)
|
|
mfcr r3
|
|
#endif
|
|
#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC)
|
|
IS_KERNEL(r11, r10)
|
|
#endif
|
|
mfspr r11, SPRN_M_TW /* Get level 1 table */
|
|
#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC)
|
|
BRANCH_UNLESS_KERNEL(3f)
|
|
lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
|
|
3:
|
|
#endif
|
|
/* Insert level 1 index */
|
|
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
|
|
lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
|
|
|
|
/* Extract level 2 index */
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
mtcr r11
|
|
bt- 28, 10f /* bit 28 = Large page (8M) */
|
|
bt- 29, 20f /* bit 29 = Large page (8M or 512k) */
|
|
#endif
|
|
rlwimi r10, r11, 0, 0, 32 - PAGE_SHIFT - 1 /* Add level 2 base */
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
4:
|
|
#if defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC) || defined (CONFIG_HUGETLB_PAGE)
|
|
mtcr r3
|
|
#endif
|
|
/* Insert the APG into the TWC from the Linux PTE. */
|
|
rlwimi r11, r10, 0, 25, 26
|
|
/* Load the MI_TWC with the attributes for this "segment." */
|
|
MTSPR_CPU6(SPRN_MI_TWC, r11, r3) /* Set segment attributes */
|
|
|
|
#if defined (CONFIG_HUGETLB_PAGE) && defined (CONFIG_PPC_4K_PAGES)
|
|
rlwimi r10, r11, 1, MI_SPS16K
|
|
#endif
|
|
#ifdef CONFIG_SWAP
|
|
rlwinm r11, r10, 32-5, _PAGE_PRESENT
|
|
and r11, r11, r10
|
|
rlwimi r10, r11, 0, _PAGE_PRESENT
|
|
#endif
|
|
li r11, RPN_PATTERN
|
|
/* The Linux PTE won't go exactly into the MMU TLB.
|
|
* Software indicator bits 20-23 and 28 must be clear.
|
|
* Software indicator bits 24, 25, 26, and 27 must be
|
|
* set. All other Linux PTE bits control the behavior
|
|
* of the MMU.
|
|
*/
|
|
#if defined (CONFIG_HUGETLB_PAGE) && defined (CONFIG_PPC_4K_PAGES)
|
|
rlwimi r10, r11, 0, 0x0ff0 /* Set 24-27, clear 20-23 */
|
|
#else
|
|
rlwimi r10, r11, 0, 0x0ff8 /* Set 24-27, clear 20-23,28 */
|
|
#endif
|
|
MTSPR_CPU6(SPRN_MI_RPN, r10, r3) /* Update TLB entry */
|
|
|
|
/* Restore registers */
|
|
#if defined(CONFIG_8xx_CPU6) || defined(CONFIG_MODULES) || defined (CONFIG_DEBUG_PAGEALLOC) || defined (CONFIG_HUGETLB_PAGE)
|
|
mfspr r3, SPRN_SPRG_SCRATCH2
|
|
#endif
|
|
EXCEPTION_EPILOG_0
|
|
rfi
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
10: /* 8M pages */
|
|
#ifdef CONFIG_PPC_16K_PAGES
|
|
/* Extract level 2 index */
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT_8M - PAGE_SHIFT), 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1), 29
|
|
/* Add level 2 base */
|
|
rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1) - 1
|
|
#else
|
|
/* Level 2 base */
|
|
rlwinm r10, r11, 0, ~HUGEPD_SHIFT_MASK
|
|
#endif
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
rlwinm r11, r11, 0, 0xf
|
|
b 4b
|
|
|
|
20: /* 512k pages */
|
|
/* Extract level 2 index */
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT_512K - PAGE_SHIFT), 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1), 29
|
|
/* Add level 2 base */
|
|
rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1) - 1
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
rlwinm r11, r11, 0, 0xf
|
|
b 4b
|
|
#endif
|
|
|
|
. = 0x1200
|
|
DataStoreTLBMiss:
|
|
mtspr SPRN_SPRG_SCRATCH2, r3
|
|
EXCEPTION_PROLOG_0
|
|
mfcr r3
|
|
|
|
/* If we are faulting a kernel address, we have to use the
|
|
* kernel page tables.
|
|
*/
|
|
mfspr r10, SPRN_MD_EPN
|
|
rlwinm r10, r10, 16, 0xfff8
|
|
cmpli cr0, r10, PAGE_OFFSET@h
|
|
mfspr r11, SPRN_M_TW /* Get level 1 table */
|
|
blt+ 3f
|
|
#ifndef CONFIG_PIN_TLB_IMMR
|
|
cmpli cr0, r10, VIRT_IMMR_BASE@h
|
|
#endif
|
|
_ENTRY(DTLBMiss_cmp)
|
|
cmpli cr7, r10, (PAGE_OFFSET + 0x1800000)@h
|
|
lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
|
|
#ifndef CONFIG_PIN_TLB_IMMR
|
|
_ENTRY(DTLBMiss_jmp)
|
|
beq- DTLBMissIMMR
|
|
#endif
|
|
blt cr7, DTLBMissLinear
|
|
3:
|
|
mfspr r10, SPRN_MD_EPN
|
|
|
|
/* Insert level 1 index */
|
|
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
|
|
lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
|
|
|
|
/* We have a pte table, so load fetch the pte from the table.
|
|
*/
|
|
/* Extract level 2 index */
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
mtcr r11
|
|
bt- 28, 10f /* bit 28 = Large page (8M) */
|
|
bt- 29, 20f /* bit 29 = Large page (8M or 512k) */
|
|
#endif
|
|
rlwimi r10, r11, 0, 0, 32 - PAGE_SHIFT - 1 /* Add level 2 base */
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
4:
|
|
mtcr r3
|
|
|
|
/* Insert the Guarded flag and APG into the TWC from the Linux PTE.
|
|
* It is bit 26-27 of both the Linux PTE and the TWC (at least
|
|
* I got that right :-). It will be better when we can put
|
|
* this into the Linux pgd/pmd and load it in the operation
|
|
* above.
|
|
*/
|
|
rlwimi r11, r10, 0, 26, 27
|
|
/* Insert the WriteThru flag into the TWC from the Linux PTE.
|
|
* It is bit 25 in the Linux PTE and bit 30 in the TWC
|
|
*/
|
|
rlwimi r11, r10, 32-5, 30, 30
|
|
MTSPR_CPU6(SPRN_MD_TWC, r11, r3)
|
|
|
|
/* In 4k pages mode, SPS (bit 28) in RPN must match PS[1] (bit 29)
|
|
* In 16k pages mode, SPS is always 1 */
|
|
#if defined (CONFIG_HUGETLB_PAGE) && defined (CONFIG_PPC_4K_PAGES)
|
|
rlwimi r10, r11, 1, MD_SPS16K
|
|
#endif
|
|
/* Both _PAGE_ACCESSED and _PAGE_PRESENT has to be set.
|
|
* We also need to know if the insn is a load/store, so:
|
|
* Clear _PAGE_PRESENT and load that which will
|
|
* trap into DTLB Error with store bit set accordinly.
|
|
*/
|
|
/* PRESENT=0x1, ACCESSED=0x20
|
|
* r11 = ((r10 & PRESENT) & ((r10 & ACCESSED) >> 5));
|
|
* r10 = (r10 & ~PRESENT) | r11;
|
|
*/
|
|
#ifdef CONFIG_SWAP
|
|
rlwinm r11, r10, 32-5, _PAGE_PRESENT
|
|
and r11, r11, r10
|
|
rlwimi r10, r11, 0, _PAGE_PRESENT
|
|
#endif
|
|
/* The Linux PTE won't go exactly into the MMU TLB.
|
|
* Software indicator bits 22 and 28 must be clear.
|
|
* Software indicator bits 24, 25, 26, and 27 must be
|
|
* set. All other Linux PTE bits control the behavior
|
|
* of the MMU.
|
|
*/
|
|
li r11, RPN_PATTERN
|
|
#if defined (CONFIG_HUGETLB_PAGE) && defined (CONFIG_PPC_4K_PAGES)
|
|
rlwimi r10, r11, 0, 24, 27 /* Set 24-27 */
|
|
#else
|
|
rlwimi r10, r11, 0, 24, 28 /* Set 24-27, clear 28 */
|
|
#endif
|
|
rlwimi r10, r11, 0, 20, 20 /* clear 20 */
|
|
MTSPR_CPU6(SPRN_MD_RPN, r10, r3) /* Update TLB entry */
|
|
|
|
/* Restore registers */
|
|
mfspr r3, SPRN_SPRG_SCRATCH2
|
|
mtspr SPRN_DAR, r11 /* Tag DAR */
|
|
EXCEPTION_EPILOG_0
|
|
rfi
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
10: /* 8M pages */
|
|
/* Extract level 2 index */
|
|
#ifdef CONFIG_PPC_16K_PAGES
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT_8M - PAGE_SHIFT), 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1), 29
|
|
/* Add level 2 base */
|
|
rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1) - 1
|
|
#else
|
|
/* Level 2 base */
|
|
rlwinm r10, r11, 0, ~HUGEPD_SHIFT_MASK
|
|
#endif
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
rlwinm r11, r11, 0, 0xf
|
|
b 4b
|
|
|
|
20: /* 512k pages */
|
|
/* Extract level 2 index */
|
|
rlwinm r10, r10, 32 - (PAGE_SHIFT_512K - PAGE_SHIFT), 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1), 29
|
|
/* Add level 2 base */
|
|
rlwimi r10, r11, 0, 0, 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1) - 1
|
|
lwz r10, 0(r10) /* Get the pte */
|
|
rlwinm r11, r11, 0, 0xf
|
|
b 4b
|
|
#endif
|
|
|
|
/* This is an instruction TLB error on the MPC8xx. This could be due
|
|
* to many reasons, such as executing guarded memory or illegal instruction
|
|
* addresses. There is nothing to do but handle a big time error fault.
|
|
*/
|
|
. = 0x1300
|
|
InstructionTLBError:
|
|
EXCEPTION_PROLOG
|
|
mr r4,r12
|
|
mr r5,r9
|
|
andis. r10,r5,0x4000
|
|
beq+ 1f
|
|
tlbie r4
|
|
/* 0x400 is InstructionAccess exception, needed by bad_page_fault() */
|
|
1: EXC_XFER_LITE(0x400, handle_page_fault)
|
|
|
|
/* This is the data TLB error on the MPC8xx. This could be due to
|
|
* many reasons, including a dirty update to a pte. We bail out to
|
|
* a higher level function that can handle it.
|
|
*/
|
|
. = 0x1400
|
|
DataTLBError:
|
|
EXCEPTION_PROLOG_0
|
|
mfcr r10
|
|
|
|
mfspr r11, SPRN_DAR
|
|
cmpwi cr0, r11, RPN_PATTERN
|
|
beq- FixupDAR /* must be a buggy dcbX, icbi insn. */
|
|
DARFixed:/* Return from dcbx instruction bug workaround */
|
|
EXCEPTION_PROLOG_1
|
|
EXCEPTION_PROLOG_2
|
|
mfspr r5,SPRN_DSISR
|
|
stw r5,_DSISR(r11)
|
|
mfspr r4,SPRN_DAR
|
|
andis. r10,r5,0x4000
|
|
beq+ 1f
|
|
tlbie r4
|
|
1: li r10,RPN_PATTERN
|
|
mtspr SPRN_DAR,r10 /* Tag DAR, to be used in DTLB Error */
|
|
/* 0x300 is DataAccess exception, needed by bad_page_fault() */
|
|
EXC_XFER_LITE(0x300, handle_page_fault)
|
|
|
|
EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1600, Trap_16, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1700, Trap_17, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1800, Trap_18, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1900, Trap_19, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1a00, Trap_1a, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1b00, Trap_1b, unknown_exception, EXC_XFER_EE)
|
|
|
|
/* On the MPC8xx, these next four traps are used for development
|
|
* support of breakpoints and such. Someday I will get around to
|
|
* using them.
|
|
*/
|
|
EXCEPTION(0x1c00, Trap_1c, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1d00, Trap_1d, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1e00, Trap_1e, unknown_exception, EXC_XFER_EE)
|
|
EXCEPTION(0x1f00, Trap_1f, unknown_exception, EXC_XFER_EE)
|
|
|
|
. = 0x2000
|
|
|
|
/*
|
|
* Bottom part of DataStoreTLBMiss handlers for IMMR area and linear RAM.
|
|
* not enough space in the DataStoreTLBMiss area.
|
|
*/
|
|
DTLBMissIMMR:
|
|
mtcr r3
|
|
/* Set 512k byte guarded page and mark it valid */
|
|
li r10, MD_PS512K | MD_GUARDED | MD_SVALID
|
|
MTSPR_CPU6(SPRN_MD_TWC, r10, r11)
|
|
mfspr r10, SPRN_IMMR /* Get current IMMR */
|
|
rlwinm r10, r10, 0, 0xfff80000 /* Get 512 kbytes boundary */
|
|
ori r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
|
|
_PAGE_PRESENT | _PAGE_NO_CACHE
|
|
MTSPR_CPU6(SPRN_MD_RPN, r10, r11) /* Update TLB entry */
|
|
|
|
li r11, RPN_PATTERN
|
|
mtspr SPRN_DAR, r11 /* Tag DAR */
|
|
mfspr r3, SPRN_SPRG_SCRATCH2
|
|
EXCEPTION_EPILOG_0
|
|
rfi
|
|
|
|
DTLBMissLinear:
|
|
mtcr r3
|
|
/* Set 8M byte page and mark it valid */
|
|
li r11, MD_PS8MEG | MD_SVALID
|
|
MTSPR_CPU6(SPRN_MD_TWC, r11, r3)
|
|
rlwinm r10, r10, 16, 0x0f800000 /* 8xx supports max 256Mb RAM */
|
|
ori r10, r10, 0xf0 | MD_SPS16K | _PAGE_SHARED | _PAGE_DIRTY | \
|
|
_PAGE_PRESENT
|
|
MTSPR_CPU6(SPRN_MD_RPN, r10, r11) /* Update TLB entry */
|
|
|
|
li r11, RPN_PATTERN
|
|
mtspr SPRN_DAR, r11 /* Tag DAR */
|
|
mfspr r3, SPRN_SPRG_SCRATCH2
|
|
EXCEPTION_EPILOG_0
|
|
rfi
|
|
|
|
/* This is the procedure to calculate the data EA for buggy dcbx,dcbi instructions
|
|
* by decoding the registers used by the dcbx instruction and adding them.
|
|
* DAR is set to the calculated address.
|
|
*/
|
|
/* define if you don't want to use self modifying code */
|
|
#define NO_SELF_MODIFYING_CODE
|
|
FixupDAR:/* Entry point for dcbx workaround. */
|
|
mtspr SPRN_SPRG_SCRATCH2, r10
|
|
/* fetch instruction from memory. */
|
|
mfspr r10, SPRN_SRR0
|
|
IS_KERNEL(r11, r10)
|
|
mfspr r11, SPRN_M_TW /* Get level 1 table */
|
|
BRANCH_UNLESS_KERNEL(3f)
|
|
rlwinm r11, r10, 16, 0xfff8
|
|
_ENTRY(FixupDAR_cmp)
|
|
cmpli cr7, r11, (PAGE_OFFSET + 0x1800000)@h
|
|
/* create physical page address from effective address */
|
|
tophys(r11, r10)
|
|
blt- cr7, 201f
|
|
lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
|
|
/* Insert level 1 index */
|
|
3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
|
|
lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
|
|
mtcr r11
|
|
bt 28,200f /* bit 28 = Large page (8M) */
|
|
bt 29,202f /* bit 29 = Large page (8M or 512K) */
|
|
rlwinm r11, r11,0,0,19 /* Extract page descriptor page address */
|
|
/* Insert level 2 index */
|
|
rlwimi r11, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
|
|
lwz r11, 0(r11) /* Get the pte */
|
|
/* concat physical page address(r11) and page offset(r10) */
|
|
rlwimi r11, r10, 0, 32 - PAGE_SHIFT, 31
|
|
201: lwz r11,0(r11)
|
|
/* Check if it really is a dcbx instruction. */
|
|
/* dcbt and dcbtst does not generate DTLB Misses/Errors,
|
|
* no need to include them here */
|
|
xoris r10, r11, 0x7c00 /* check if major OP code is 31 */
|
|
rlwinm r10, r10, 0, 21, 5
|
|
cmpwi cr0, r10, 2028 /* Is dcbz? */
|
|
beq+ 142f
|
|
cmpwi cr0, r10, 940 /* Is dcbi? */
|
|
beq+ 142f
|
|
cmpwi cr0, r10, 108 /* Is dcbst? */
|
|
beq+ 144f /* Fix up store bit! */
|
|
cmpwi cr0, r10, 172 /* Is dcbf? */
|
|
beq+ 142f
|
|
cmpwi cr0, r10, 1964 /* Is icbi? */
|
|
beq+ 142f
|
|
141: mfspr r10,SPRN_SPRG_SCRATCH2
|
|
b DARFixed /* Nope, go back to normal TLB processing */
|
|
|
|
/* concat physical page address(r11) and page offset(r10) */
|
|
200:
|
|
#ifdef CONFIG_PPC_16K_PAGES
|
|
rlwinm r11, r11, 0, 0, 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1) - 1
|
|
rlwimi r11, r10, 32 - (PAGE_SHIFT_8M - 2), 32 + PAGE_SHIFT_8M - (PAGE_SHIFT << 1), 29
|
|
#else
|
|
rlwinm r11, r10, 0, ~HUGEPD_SHIFT_MASK
|
|
#endif
|
|
lwz r11, 0(r11) /* Get the pte */
|
|
/* concat physical page address(r11) and page offset(r10) */
|
|
rlwimi r11, r10, 0, 32 - PAGE_SHIFT_8M, 31
|
|
b 201b
|
|
|
|
202:
|
|
rlwinm r11, r11, 0, 0, 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1) - 1
|
|
rlwimi r11, r10, 32 - (PAGE_SHIFT_512K - 2), 32 + PAGE_SHIFT_512K - (PAGE_SHIFT << 1), 29
|
|
lwz r11, 0(r11) /* Get the pte */
|
|
/* concat physical page address(r11) and page offset(r10) */
|
|
rlwimi r11, r10, 0, 32 - PAGE_SHIFT_512K, 31
|
|
b 201b
|
|
|
|
144: mfspr r10, SPRN_DSISR
|
|
rlwinm r10, r10,0,7,5 /* Clear store bit for buggy dcbst insn */
|
|
mtspr SPRN_DSISR, r10
|
|
142: /* continue, it was a dcbx, dcbi instruction. */
|
|
#ifndef NO_SELF_MODIFYING_CODE
|
|
andis. r10,r11,0x1f /* test if reg RA is r0 */
|
|
li r10,modified_instr@l
|
|
dcbtst r0,r10 /* touch for store */
|
|
rlwinm r11,r11,0,0,20 /* Zero lower 10 bits */
|
|
oris r11,r11,640 /* Transform instr. to a "add r10,RA,RB" */
|
|
ori r11,r11,532
|
|
stw r11,0(r10) /* store add/and instruction */
|
|
dcbf 0,r10 /* flush new instr. to memory. */
|
|
icbi 0,r10 /* invalidate instr. cache line */
|
|
mfspr r11, SPRN_SPRG_SCRATCH1 /* restore r11 */
|
|
mfspr r10, SPRN_SPRG_SCRATCH0 /* restore r10 */
|
|
isync /* Wait until new instr is loaded from memory */
|
|
modified_instr:
|
|
.space 4 /* this is where the add instr. is stored */
|
|
bne+ 143f
|
|
subf r10,r0,r10 /* r10=r10-r0, only if reg RA is r0 */
|
|
143: mtdar r10 /* store faulting EA in DAR */
|
|
mfspr r10,SPRN_SPRG_SCRATCH2
|
|
b DARFixed /* Go back to normal TLB handling */
|
|
#else
|
|
mfctr r10
|
|
mtdar r10 /* save ctr reg in DAR */
|
|
rlwinm r10, r11, 24, 24, 28 /* offset into jump table for reg RB */
|
|
addi r10, r10, 150f@l /* add start of table */
|
|
mtctr r10 /* load ctr with jump address */
|
|
xor r10, r10, r10 /* sum starts at zero */
|
|
bctr /* jump into table */
|
|
150:
|
|
add r10, r10, r0 ;b 151f
|
|
add r10, r10, r1 ;b 151f
|
|
add r10, r10, r2 ;b 151f
|
|
add r10, r10, r3 ;b 151f
|
|
add r10, r10, r4 ;b 151f
|
|
add r10, r10, r5 ;b 151f
|
|
add r10, r10, r6 ;b 151f
|
|
add r10, r10, r7 ;b 151f
|
|
add r10, r10, r8 ;b 151f
|
|
add r10, r10, r9 ;b 151f
|
|
mtctr r11 ;b 154f /* r10 needs special handling */
|
|
mtctr r11 ;b 153f /* r11 needs special handling */
|
|
add r10, r10, r12 ;b 151f
|
|
add r10, r10, r13 ;b 151f
|
|
add r10, r10, r14 ;b 151f
|
|
add r10, r10, r15 ;b 151f
|
|
add r10, r10, r16 ;b 151f
|
|
add r10, r10, r17 ;b 151f
|
|
add r10, r10, r18 ;b 151f
|
|
add r10, r10, r19 ;b 151f
|
|
add r10, r10, r20 ;b 151f
|
|
add r10, r10, r21 ;b 151f
|
|
add r10, r10, r22 ;b 151f
|
|
add r10, r10, r23 ;b 151f
|
|
add r10, r10, r24 ;b 151f
|
|
add r10, r10, r25 ;b 151f
|
|
add r10, r10, r26 ;b 151f
|
|
add r10, r10, r27 ;b 151f
|
|
add r10, r10, r28 ;b 151f
|
|
add r10, r10, r29 ;b 151f
|
|
add r10, r10, r30 ;b 151f
|
|
add r10, r10, r31
|
|
151:
|
|
rlwinm. r11,r11,19,24,28 /* offset into jump table for reg RA */
|
|
beq 152f /* if reg RA is zero, don't add it */
|
|
addi r11, r11, 150b@l /* add start of table */
|
|
mtctr r11 /* load ctr with jump address */
|
|
rlwinm r11,r11,0,16,10 /* make sure we don't execute this more than once */
|
|
bctr /* jump into table */
|
|
152:
|
|
mfdar r11
|
|
mtctr r11 /* restore ctr reg from DAR */
|
|
mtdar r10 /* save fault EA to DAR */
|
|
mfspr r10,SPRN_SPRG_SCRATCH2
|
|
b DARFixed /* Go back to normal TLB handling */
|
|
|
|
/* special handling for r10,r11 since these are modified already */
|
|
153: mfspr r11, SPRN_SPRG_SCRATCH1 /* load r11 from SPRN_SPRG_SCRATCH1 */
|
|
add r10, r10, r11 /* add it */
|
|
mfctr r11 /* restore r11 */
|
|
b 151b
|
|
154: mfspr r11, SPRN_SPRG_SCRATCH0 /* load r10 from SPRN_SPRG_SCRATCH0 */
|
|
add r10, r10, r11 /* add it */
|
|
mfctr r11 /* restore r11 */
|
|
b 151b
|
|
#endif
|
|
|
|
/*
|
|
* This is where the main kernel code starts.
|
|
*/
|
|
start_here:
|
|
/* ptr to current */
|
|
lis r2,init_task@h
|
|
ori r2,r2,init_task@l
|
|
|
|
/* ptr to phys current thread */
|
|
tophys(r4,r2)
|
|
addi r4,r4,THREAD /* init task's THREAD */
|
|
mtspr SPRN_SPRG_THREAD,r4
|
|
|
|
/* 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)
|
|
|
|
bl early_init /* We have to do this with MMU on */
|
|
|
|
/*
|
|
* Decide what sort of machine this is and initialize the MMU.
|
|
*/
|
|
li r3,0
|
|
mr r4,r31
|
|
bl machine_init
|
|
bl MMU_init
|
|
|
|
/*
|
|
* Go back to running unmapped so we can load up new values
|
|
* and change to using our exception vectors.
|
|
* On the 8xx, all we have to do is invalidate the TLB to clear
|
|
* the old 8M byte TLB mappings and load the page table base register.
|
|
*/
|
|
/* The right way to do this would be to track it down through
|
|
* init's THREAD like the context switch code does, but this is
|
|
* easier......until someone changes init's static structures.
|
|
*/
|
|
lis r6, swapper_pg_dir@ha
|
|
tophys(r6,r6)
|
|
#ifdef CONFIG_8xx_CPU6
|
|
lis r4, cpu6_errata_word@h
|
|
ori r4, r4, cpu6_errata_word@l
|
|
li r3, 0x3f80
|
|
stw r3, 12(r4)
|
|
lwz r3, 12(r4)
|
|
#endif
|
|
mtspr SPRN_M_TW, r6
|
|
lis r4,2f@h
|
|
ori r4,r4,2f@l
|
|
tophys(r4,r4)
|
|
li r3,MSR_KERNEL & ~(MSR_IR|MSR_DR)
|
|
mtspr SPRN_SRR0,r4
|
|
mtspr SPRN_SRR1,r3
|
|
rfi
|
|
/* Load up the kernel context */
|
|
2:
|
|
SYNC /* Force all PTE updates to finish */
|
|
tlbia /* Clear all TLB entries */
|
|
sync /* wait for tlbia/tlbie to finish */
|
|
TLBSYNC /* ... on all CPUs */
|
|
|
|
/* set up the PTE pointers for the Abatron bdiGDB.
|
|
*/
|
|
tovirt(r6,r6)
|
|
lis r5, abatron_pteptrs@h
|
|
ori r5, r5, abatron_pteptrs@l
|
|
stw r5, 0xf0(r0) /* Must match your Abatron config file */
|
|
tophys(r5,r5)
|
|
stw r6, 0(r5)
|
|
|
|
/* 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 /* enable MMU and jump to start_kernel */
|
|
|
|
/* Set up the initial MMU state so we can do the first level of
|
|
* kernel initialization. This maps the first 8 MBytes of memory 1:1
|
|
* virtual to physical. Also, set the cache mode since that is defined
|
|
* by TLB entries and perform any additional mapping (like of the IMMR).
|
|
* If configured to pin some TLBs, we pin the first 8 Mbytes of kernel,
|
|
* 24 Mbytes of data, and the 512k IMMR space. Anything not covered by
|
|
* these mappings is mapped by page tables.
|
|
*/
|
|
initial_mmu:
|
|
li r8, 0
|
|
mtspr SPRN_MI_CTR, r8 /* remove PINNED ITLB entries */
|
|
lis r10, MD_RESETVAL@h
|
|
#ifndef CONFIG_8xx_COPYBACK
|
|
oris r10, r10, MD_WTDEF@h
|
|
#endif
|
|
mtspr SPRN_MD_CTR, r10 /* remove PINNED DTLB entries */
|
|
|
|
tlbia /* Invalidate all TLB entries */
|
|
/* Always pin the first 8 MB ITLB to prevent ITLB
|
|
misses while mucking around with SRR0/SRR1 in asm
|
|
*/
|
|
lis r8, MI_RSV4I@h
|
|
ori r8, r8, 0x1c00
|
|
|
|
mtspr SPRN_MI_CTR, r8 /* Set instruction MMU control */
|
|
|
|
#ifdef CONFIG_PIN_TLB
|
|
oris r10, r10, MD_RSV4I@h
|
|
mtspr SPRN_MD_CTR, r10 /* Set data TLB control */
|
|
#endif
|
|
|
|
/* Now map the lower 8 Meg into the ITLB. */
|
|
lis r8, KERNELBASE@h /* Create vaddr for TLB */
|
|
ori r8, r8, MI_EVALID /* Mark it valid */
|
|
mtspr SPRN_MI_EPN, r8
|
|
li r8, MI_PS8MEG | (2 << 5) /* Set 8M byte page, APG 2 */
|
|
ori r8, r8, MI_SVALID /* Make it valid */
|
|
mtspr SPRN_MI_TWC, r8
|
|
li r8, MI_BOOTINIT /* Create RPN for address 0 */
|
|
mtspr SPRN_MI_RPN, r8 /* Store TLB entry */
|
|
|
|
lis r8, MI_APG_INIT@h /* Set protection modes */
|
|
ori r8, r8, MI_APG_INIT@l
|
|
mtspr SPRN_MI_AP, r8
|
|
lis r8, MD_APG_INIT@h
|
|
ori r8, r8, MD_APG_INIT@l
|
|
mtspr SPRN_MD_AP, r8
|
|
|
|
/* Map a 512k page for the IMMR to get the processor
|
|
* internal registers (among other things).
|
|
*/
|
|
#ifdef CONFIG_PIN_TLB_IMMR
|
|
ori r10, r10, 0x1c00
|
|
mtspr SPRN_MD_CTR, r10
|
|
|
|
mfspr r9, 638 /* Get current IMMR */
|
|
andis. r9, r9, 0xfff8 /* Get 512 kbytes boundary */
|
|
|
|
lis r8, VIRT_IMMR_BASE@h /* Create vaddr for TLB */
|
|
ori r8, r8, MD_EVALID /* Mark it valid */
|
|
mtspr SPRN_MD_EPN, r8
|
|
li r8, MD_PS512K | MD_GUARDED /* Set 512k byte page */
|
|
ori r8, r8, MD_SVALID /* Make it valid */
|
|
mtspr SPRN_MD_TWC, r8
|
|
mr r8, r9 /* Create paddr for TLB */
|
|
ori r8, r8, MI_BOOTINIT|0x2 /* Inhibit cache -- Cort */
|
|
mtspr SPRN_MD_RPN, r8
|
|
#endif
|
|
|
|
/* Since the cache is enabled according to the information we
|
|
* just loaded into the TLB, invalidate and enable the caches here.
|
|
* We should probably check/set other modes....later.
|
|
*/
|
|
lis r8, IDC_INVALL@h
|
|
mtspr SPRN_IC_CST, r8
|
|
mtspr SPRN_DC_CST, r8
|
|
lis r8, IDC_ENABLE@h
|
|
mtspr SPRN_IC_CST, r8
|
|
#ifdef CONFIG_8xx_COPYBACK
|
|
mtspr SPRN_DC_CST, r8
|
|
#else
|
|
/* For a debug option, I left this here to easily enable
|
|
* the write through cache mode
|
|
*/
|
|
lis r8, DC_SFWT@h
|
|
mtspr SPRN_DC_CST, r8
|
|
lis r8, IDC_ENABLE@h
|
|
mtspr SPRN_DC_CST, r8
|
|
#endif
|
|
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
|
|
.globl sdata
|
|
sdata:
|
|
.globl empty_zero_page
|
|
.align PAGE_SHIFT
|
|
empty_zero_page:
|
|
.space PAGE_SIZE
|
|
EXPORT_SYMBOL(empty_zero_page)
|
|
|
|
.globl swapper_pg_dir
|
|
swapper_pg_dir:
|
|
.space PGD_TABLE_SIZE
|
|
|
|
/* Room for two PTE table poiners, usually the kernel and current user
|
|
* pointer to their respective root page table (pgdir).
|
|
*/
|
|
abatron_pteptrs:
|
|
.space 8
|
|
|
|
#ifdef CONFIG_8xx_CPU6
|
|
.globl cpu6_errata_word
|
|
cpu6_errata_word:
|
|
.space 16
|
|
#endif
|
|
|