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linux/arch/powerpc/kernel/exceptions-64e.S

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/*
* Boot code and exception vectors for Book3E processors
*
* Copyright (C) 2007 Ben. Herrenschmidt (benh@kernel.crashing.org), IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/threads.h>
#include <asm/reg.h>
#include <asm/page.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/cputable.h>
#include <asm/setup.h>
#include <asm/thread_info.h>
#include <asm/reg.h>
#include <asm/exception-64e.h>
#include <asm/bug.h>
#include <asm/irqflags.h>
#include <asm/ptrace.h>
#include <asm/ppc-opcode.h>
#include <asm/mmu.h>
/* XXX This will ultimately add space for a special exception save
* structure used to save things like SRR0/SRR1, SPRGs, MAS, etc...
* when taking special interrupts. For now we don't support that,
* special interrupts from within a non-standard level will probably
* blow you up
*/
#define SPECIAL_EXC_FRAME_SIZE INT_FRAME_SIZE
/* Exception prolog code for all exceptions */
#define EXCEPTION_PROLOG(n, type, addition) \
mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \
mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \
std r10,PACA_EX##type+EX_R10(r13); \
std r11,PACA_EX##type+EX_R11(r13); \
mfcr r10; /* save CR */ \
addition; /* additional code for that exc. */ \
std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \
stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \
mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \
type##_SET_KSTACK; /* get special stack if necessary */\
andi. r10,r11,MSR_PR; /* save stack pointer */ \
beq 1f; /* branch around if supervisor */ \
ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\
1: cmpdi cr1,r1,0; /* check if SP makes sense */ \
bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \
mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */
/* Exception type-specific macros */
#define GEN_SET_KSTACK \
subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */
#define SPRN_GEN_SRR0 SPRN_SRR0
#define SPRN_GEN_SRR1 SPRN_SRR1
#define CRIT_SET_KSTACK \
ld r1,PACA_CRIT_STACK(r13); \
subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
#define SPRN_CRIT_SRR0 SPRN_CSRR0
#define SPRN_CRIT_SRR1 SPRN_CSRR1
#define DBG_SET_KSTACK \
ld r1,PACA_DBG_STACK(r13); \
subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
#define SPRN_DBG_SRR0 SPRN_DSRR0
#define SPRN_DBG_SRR1 SPRN_DSRR1
#define MC_SET_KSTACK \
ld r1,PACA_MC_STACK(r13); \
subi r1,r1,SPECIAL_EXC_FRAME_SIZE;
#define SPRN_MC_SRR0 SPRN_MCSRR0
#define SPRN_MC_SRR1 SPRN_MCSRR1
#define NORMAL_EXCEPTION_PROLOG(n, addition) \
EXCEPTION_PROLOG(n, GEN, addition##_GEN)
#define CRIT_EXCEPTION_PROLOG(n, addition) \
EXCEPTION_PROLOG(n, CRIT, addition##_CRIT)
#define DBG_EXCEPTION_PROLOG(n, addition) \
EXCEPTION_PROLOG(n, DBG, addition##_DBG)
#define MC_EXCEPTION_PROLOG(n, addition) \
EXCEPTION_PROLOG(n, MC, addition##_MC)
/* Variants of the "addition" argument for the prolog
*/
#define PROLOG_ADDITION_NONE_GEN
#define PROLOG_ADDITION_NONE_CRIT
#define PROLOG_ADDITION_NONE_DBG
#define PROLOG_ADDITION_NONE_MC
#define PROLOG_ADDITION_MASKABLE_GEN \
lbz r11,PACASOFTIRQEN(r13); /* are irqs soft-disabled ? */ \
cmpwi cr0,r11,0; /* yes -> go out of line */ \
beq masked_interrupt_book3e;
#define PROLOG_ADDITION_2REGS_GEN \
std r14,PACA_EXGEN+EX_R14(r13); \
std r15,PACA_EXGEN+EX_R15(r13)
#define PROLOG_ADDITION_1REG_GEN \
std r14,PACA_EXGEN+EX_R14(r13);
#define PROLOG_ADDITION_2REGS_CRIT \
std r14,PACA_EXCRIT+EX_R14(r13); \
std r15,PACA_EXCRIT+EX_R15(r13)
#define PROLOG_ADDITION_2REGS_DBG \
std r14,PACA_EXDBG+EX_R14(r13); \
std r15,PACA_EXDBG+EX_R15(r13)
#define PROLOG_ADDITION_2REGS_MC \
std r14,PACA_EXMC+EX_R14(r13); \
std r15,PACA_EXMC+EX_R15(r13)
/* Core exception code for all exceptions except TLB misses.
* XXX: Needs to make SPRN_SPRG_GEN depend on exception type
*/
#define EXCEPTION_COMMON(n, excf, ints) \
std r0,GPR0(r1); /* save r0 in stackframe */ \
std r2,GPR2(r1); /* save r2 in stackframe */ \
SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
std r9,GPR9(r1); /* save r9 in stackframe */ \
std r10,_NIP(r1); /* save SRR0 to stackframe */ \
std r11,_MSR(r1); /* save SRR1 to stackframe */ \
ACCOUNT_CPU_USER_ENTRY(r10,r11);/* accounting (uses cr0+eq) */ \
ld r3,excf+EX_R10(r13); /* get back r10 */ \
ld r4,excf+EX_R11(r13); /* get back r11 */ \
mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 */ \
std r12,GPR12(r1); /* save r12 in stackframe */ \
ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
mflr r6; /* save LR in stackframe */ \
mfctr r7; /* save CTR in stackframe */ \
mfspr r8,SPRN_XER; /* save XER in stackframe */ \
ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \
lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \
lbz r11,PACASOFTIRQEN(r13); /* get current IRQ softe */ \
ld r12,exception_marker@toc(r2); \
li r0,0; \
std r3,GPR10(r1); /* save r10 to stackframe */ \
std r4,GPR11(r1); /* save r11 to stackframe */ \
std r5,GPR13(r1); /* save it to stackframe */ \
std r6,_LINK(r1); \
std r7,_CTR(r1); \
std r8,_XER(r1); \
li r3,(n)+1; /* indicate partial regs in trap */ \
std r9,0(r1); /* store stack frame back link */ \
std r10,_CCR(r1); /* store orig CR in stackframe */ \
std r9,GPR1(r1); /* store stack frame back link */ \
std r11,SOFTE(r1); /* and save it to stackframe */ \
std r12,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \
std r3,_TRAP(r1); /* set trap number */ \
std r0,RESULT(r1); /* clear regs->result */ \
ints;
/* Variants for the "ints" argument */
#define INTS_KEEP
#define INTS_DISABLE_SOFT \
stb r0,PACASOFTIRQEN(r13); /* mark interrupts soft-disabled */ \
TRACE_DISABLE_INTS;
#define INTS_DISABLE_HARD \
stb r0,PACAHARDIRQEN(r13); /* and hard disabled */
#define INTS_DISABLE_ALL \
INTS_DISABLE_SOFT \
INTS_DISABLE_HARD
/* This is called by exceptions that used INTS_KEEP (that is did not clear
* neither soft nor hard IRQ indicators in the PACA. This will restore MSR:EE
* to it's previous value
*
* XXX In the long run, we may want to open-code it in order to separate the
* load from the wrtee, thus limiting the latency caused by the dependency
* but at this point, I'll favor code clarity until we have a near to final
* implementation
*/
#define INTS_RESTORE_HARD \
ld r11,_MSR(r1); \
wrtee r11;
/* XXX FIXME: Restore r14/r15 when necessary */
#define BAD_STACK_TRAMPOLINE(n) \
exc_##n##_bad_stack: \
li r1,(n); /* get exception number */ \
sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \
b bad_stack_book3e; /* bad stack error */
#define EXCEPTION_STUB(loc, label) \
. = interrupt_base_book3e + loc; \
nop; /* To make debug interrupts happy */ \
b exc_##label##_book3e;
#define ACK_NONE(r)
#define ACK_DEC(r) \
lis r,TSR_DIS@h; \
mtspr SPRN_TSR,r
#define ACK_FIT(r) \
lis r,TSR_FIS@h; \
mtspr SPRN_TSR,r
#define MASKABLE_EXCEPTION(trapnum, label, hdlr, ack) \
START_EXCEPTION(label); \
NORMAL_EXCEPTION_PROLOG(trapnum, PROLOG_ADDITION_MASKABLE) \
EXCEPTION_COMMON(trapnum, PACA_EXGEN, INTS_DISABLE_ALL) \
ack(r8); \
addi r3,r1,STACK_FRAME_OVERHEAD; \
bl hdlr; \
b .ret_from_except_lite;
/* This value is used to mark exception frames on the stack. */
.section ".toc","aw"
exception_marker:
.tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER
/*
* And here we have the exception vectors !
*/
.text
.balign 0x1000
.globl interrupt_base_book3e
interrupt_base_book3e: /* fake trap */
/* Note: If real debug exceptions are supported by the HW, the vector
* below will have to be patched up to point to an appropriate handler
*/
EXCEPTION_STUB(0x000, machine_check) /* 0x0200 */
EXCEPTION_STUB(0x020, critical_input) /* 0x0580 */
EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */
EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */
EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */
EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */
EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */
EXCEPTION_STUB(0x0e0, program) /* 0x0700 */
EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */
EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */
EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */
EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
EXCEPTION_STUB(0x1c0, data_tlb_miss)
EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
#if 0
EXCEPTION_STUB(0x280, processor_doorbell)
EXCEPTION_STUB(0x220, processor_doorbell_crit)
#endif
.globl interrupt_end_book3e
interrupt_end_book3e:
/* Critical Input Interrupt */
START_EXCEPTION(critical_input);
CRIT_EXCEPTION_PROLOG(0x100, PROLOG_ADDITION_NONE)
// EXCEPTION_COMMON(0x100, PACA_EXCRIT, INTS_DISABLE_ALL)
// bl special_reg_save_crit
// addi r3,r1,STACK_FRAME_OVERHEAD
// bl .critical_exception
// b ret_from_crit_except
b .
/* Machine Check Interrupt */
START_EXCEPTION(machine_check);
CRIT_EXCEPTION_PROLOG(0x200, PROLOG_ADDITION_NONE)
// EXCEPTION_COMMON(0x200, PACA_EXMC, INTS_DISABLE_ALL)
// bl special_reg_save_mc
// addi r3,r1,STACK_FRAME_OVERHEAD
// bl .machine_check_exception
// b ret_from_mc_except
b .
/* Data Storage Interrupt */
START_EXCEPTION(data_storage)
NORMAL_EXCEPTION_PROLOG(0x300, PROLOG_ADDITION_2REGS)
mfspr r14,SPRN_DEAR
mfspr r15,SPRN_ESR
EXCEPTION_COMMON(0x300, PACA_EXGEN, INTS_KEEP)
b storage_fault_common
/* Instruction Storage Interrupt */
START_EXCEPTION(instruction_storage);
NORMAL_EXCEPTION_PROLOG(0x400, PROLOG_ADDITION_2REGS)
li r15,0
mr r14,r10
EXCEPTION_COMMON(0x400, PACA_EXGEN, INTS_KEEP)
b storage_fault_common
/* External Input Interrupt */
MASKABLE_EXCEPTION(0x500, external_input, .do_IRQ, ACK_NONE)
/* Alignment */
START_EXCEPTION(alignment);
NORMAL_EXCEPTION_PROLOG(0x600, PROLOG_ADDITION_2REGS)
mfspr r14,SPRN_DEAR
mfspr r15,SPRN_ESR
EXCEPTION_COMMON(0x600, PACA_EXGEN, INTS_KEEP)
b alignment_more /* no room, go out of line */
/* Program Interrupt */
START_EXCEPTION(program);
NORMAL_EXCEPTION_PROLOG(0x700, PROLOG_ADDITION_1REG)
mfspr r14,SPRN_ESR
EXCEPTION_COMMON(0x700, PACA_EXGEN, INTS_DISABLE_SOFT)
std r14,_DSISR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
ld r14,PACA_EXGEN+EX_R14(r13)
bl .save_nvgprs
INTS_RESTORE_HARD
bl .program_check_exception
b .ret_from_except
/* Floating Point Unavailable Interrupt */
START_EXCEPTION(fp_unavailable);
NORMAL_EXCEPTION_PROLOG(0x800, PROLOG_ADDITION_NONE)
/* we can probably do a shorter exception entry for that one... */
EXCEPTION_COMMON(0x800, PACA_EXGEN, INTS_KEEP)
bne 1f /* if from user, just load it up */
bl .save_nvgprs
addi r3,r1,STACK_FRAME_OVERHEAD
INTS_RESTORE_HARD
bl .kernel_fp_unavailable_exception
BUG_OPCODE
1: ld r12,_MSR(r1)
bl .load_up_fpu
b fast_exception_return
/* Decrementer Interrupt */
MASKABLE_EXCEPTION(0x900, decrementer, .timer_interrupt, ACK_DEC)
/* Fixed Interval Timer Interrupt */
MASKABLE_EXCEPTION(0x980, fixed_interval, .unknown_exception, ACK_FIT)
/* Watchdog Timer Interrupt */
START_EXCEPTION(watchdog);
CRIT_EXCEPTION_PROLOG(0x9f0, PROLOG_ADDITION_NONE)
// EXCEPTION_COMMON(0x9f0, PACA_EXCRIT, INTS_DISABLE_ALL)
// bl special_reg_save_crit
// addi r3,r1,STACK_FRAME_OVERHEAD
// bl .unknown_exception
// b ret_from_crit_except
b .
/* System Call Interrupt */
START_EXCEPTION(system_call)
mr r9,r13 /* keep a copy of userland r13 */
mfspr r11,SPRN_SRR0 /* get return address */
mfspr r12,SPRN_SRR1 /* get previous MSR */
mfspr r13,SPRN_SPRG_PACA /* get our PACA */
b system_call_common
/* Auxillary Processor Unavailable Interrupt */
START_EXCEPTION(ap_unavailable);
NORMAL_EXCEPTION_PROLOG(0xf20, PROLOG_ADDITION_NONE)
EXCEPTION_COMMON(0xf20, PACA_EXGEN, INTS_KEEP)
addi r3,r1,STACK_FRAME_OVERHEAD
bl .save_nvgprs
INTS_RESTORE_HARD
bl .unknown_exception
b .ret_from_except
/* Debug exception as a critical interrupt*/
START_EXCEPTION(debug_crit);
CRIT_EXCEPTION_PROLOG(0xd00, PROLOG_ADDITION_2REGS)
/*
* If there is a single step or branch-taken exception in an
* exception entry sequence, it was probably meant to apply to
* the code where the exception occurred (since exception entry
* doesn't turn off DE automatically). We simulate the effect
* of turning off DE on entry to an exception handler by turning
* off DE in the CSRR1 value and clearing the debug status.
*/
mfspr r14,SPRN_DBSR /* check single-step/branch taken */
andis. r15,r14,DBSR_IC@h
beq+ 1f
LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e)
LOAD_REG_IMMEDIATE(r15,interrupt_end_book3e)
cmpld cr0,r10,r14
cmpld cr1,r10,r15
blt+ cr0,1f
bge+ cr1,1f
/* here it looks like we got an inappropriate debug exception. */
lis r14,DBSR_IC@h /* clear the IC event */
rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */
mtspr SPRN_DBSR,r14
mtspr SPRN_CSRR1,r11
lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */
ld r1,PACA_EXCRIT+EX_R1(r13)
ld r14,PACA_EXCRIT+EX_R14(r13)
ld r15,PACA_EXCRIT+EX_R15(r13)
mtcr r10
ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */
ld r11,PACA_EXCRIT+EX_R11(r13)
mfspr r13,SPRN_SPRG_CRIT_SCRATCH
rfci
/* Normal debug exception */
/* XXX We only handle coming from userspace for now since we can't
* quite save properly an interrupted kernel state yet
*/
1: andi. r14,r11,MSR_PR; /* check for userspace again */
beq kernel_dbg_exc; /* if from kernel mode */
/* Now we mash up things to make it look like we are coming on a
* normal exception
*/
mfspr r15,SPRN_SPRG_CRIT_SCRATCH
mtspr SPRN_SPRG_GEN_SCRATCH,r15
mfspr r14,SPRN_DBSR
EXCEPTION_COMMON(0xd00, PACA_EXCRIT, INTS_DISABLE_ALL)
std r14,_DSISR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
mr r4,r14
ld r14,PACA_EXCRIT+EX_R14(r13)
ld r15,PACA_EXCRIT+EX_R15(r13)
bl .save_nvgprs
bl .DebugException
b .ret_from_except
kernel_dbg_exc:
b . /* NYI */
/*
* An interrupt came in while soft-disabled; clear EE in SRR1,
* clear paca->hard_enabled and return.
*/
masked_interrupt_book3e:
mtcr r10
stb r11,PACAHARDIRQEN(r13)
mfspr r10,SPRN_SRR1
rldicl r11,r10,48,1 /* clear MSR_EE */
rotldi r10,r11,16
mtspr SPRN_SRR1,r10
ld r10,PACA_EXGEN+EX_R10(r13); /* restore registers */
ld r11,PACA_EXGEN+EX_R11(r13);
mfspr r13,SPRN_SPRG_GEN_SCRATCH;
rfi
b .
/*
* This is called from 0x300 and 0x400 handlers after the prologs with
* r14 and r15 containing the fault address and error code, with the
* original values stashed away in the PACA
*/
storage_fault_common:
std r14,_DAR(r1)
std r15,_DSISR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
mr r4,r14
mr r5,r15
ld r14,PACA_EXGEN+EX_R14(r13)
ld r15,PACA_EXGEN+EX_R15(r13)
INTS_RESTORE_HARD
bl .do_page_fault
cmpdi r3,0
bne- 1f
b .ret_from_except_lite
1: bl .save_nvgprs
mr r5,r3
addi r3,r1,STACK_FRAME_OVERHEAD
ld r4,_DAR(r1)
bl .bad_page_fault
b .ret_from_except
/*
* Alignment exception doesn't fit entirely in the 0x100 bytes so it
* continues here.
*/
alignment_more:
std r14,_DAR(r1)
std r15,_DSISR(r1)
addi r3,r1,STACK_FRAME_OVERHEAD
ld r14,PACA_EXGEN+EX_R14(r13)
ld r15,PACA_EXGEN+EX_R15(r13)
bl .save_nvgprs
INTS_RESTORE_HARD
bl .alignment_exception
b .ret_from_except
/*
* We branch here from entry_64.S for the last stage of the exception
* return code path. MSR:EE is expected to be off at that point
*/
_GLOBAL(exception_return_book3e)
b 1f
/* This is the return from load_up_fpu fast path which could do with
* less GPR restores in fact, but for now we have a single return path
*/
.globl fast_exception_return
fast_exception_return:
wrteei 0
1: mr r0,r13
ld r10,_MSR(r1)
REST_4GPRS(2, r1)
andi. r6,r10,MSR_PR
REST_2GPRS(6, r1)
beq 1f
ACCOUNT_CPU_USER_EXIT(r10, r11)
ld r0,GPR13(r1)
1: stdcx. r0,0,r1 /* to clear the reservation */
ld r8,_CCR(r1)
ld r9,_LINK(r1)
ld r10,_CTR(r1)
ld r11,_XER(r1)
mtcr r8
mtlr r9
mtctr r10
mtxer r11
REST_2GPRS(8, r1)
ld r10,GPR10(r1)
ld r11,GPR11(r1)
ld r12,GPR12(r1)
mtspr SPRN_SPRG_GEN_SCRATCH,r0
std r10,PACA_EXGEN+EX_R10(r13);
std r11,PACA_EXGEN+EX_R11(r13);
ld r10,_NIP(r1)
ld r11,_MSR(r1)
ld r0,GPR0(r1)
ld r1,GPR1(r1)
mtspr SPRN_SRR0,r10
mtspr SPRN_SRR1,r11
ld r10,PACA_EXGEN+EX_R10(r13)
ld r11,PACA_EXGEN+EX_R11(r13)
mfspr r13,SPRN_SPRG_GEN_SCRATCH
rfi
/*
* Trampolines used when spotting a bad kernel stack pointer in
* the exception entry code.
*
* TODO: move some bits like SRR0 read to trampoline, pass PACA
* index around, etc... to handle crit & mcheck
*/
BAD_STACK_TRAMPOLINE(0x000)
BAD_STACK_TRAMPOLINE(0x100)
BAD_STACK_TRAMPOLINE(0x200)
BAD_STACK_TRAMPOLINE(0x300)
BAD_STACK_TRAMPOLINE(0x400)
BAD_STACK_TRAMPOLINE(0x500)
BAD_STACK_TRAMPOLINE(0x600)
BAD_STACK_TRAMPOLINE(0x700)
BAD_STACK_TRAMPOLINE(0x800)
BAD_STACK_TRAMPOLINE(0x900)
BAD_STACK_TRAMPOLINE(0x980)
BAD_STACK_TRAMPOLINE(0x9f0)
BAD_STACK_TRAMPOLINE(0xa00)
BAD_STACK_TRAMPOLINE(0xb00)
BAD_STACK_TRAMPOLINE(0xc00)
BAD_STACK_TRAMPOLINE(0xd00)
BAD_STACK_TRAMPOLINE(0xe00)
BAD_STACK_TRAMPOLINE(0xf00)
BAD_STACK_TRAMPOLINE(0xf20)
.globl bad_stack_book3e
bad_stack_book3e:
/* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */
mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */
ld r1,PACAEMERGSP(r13)
subi r1,r1,64+INT_FRAME_SIZE
std r10,_NIP(r1)
std r11,_MSR(r1)
ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */
lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */
std r10,GPR1(r1)
std r11,_CCR(r1)
mfspr r10,SPRN_DEAR
mfspr r11,SPRN_ESR
std r10,_DAR(r1)
std r11,_DSISR(r1)
std r0,GPR0(r1); /* save r0 in stackframe */ \
std r2,GPR2(r1); /* save r2 in stackframe */ \
SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
std r9,GPR9(r1); /* save r9 in stackframe */ \
ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \
ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \
mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \
std r3,GPR10(r1); /* save r10 to stackframe */ \
std r4,GPR11(r1); /* save r11 to stackframe */ \
std r12,GPR12(r1); /* save r12 in stackframe */ \
std r5,GPR13(r1); /* save it to stackframe */ \
mflr r10
mfctr r11
mfxer r12
std r10,_LINK(r1)
std r11,_CTR(r1)
std r12,_XER(r1)
SAVE_10GPRS(14,r1)
SAVE_8GPRS(24,r1)
lhz r12,PACA_TRAP_SAVE(r13)
std r12,_TRAP(r1)
addi r11,r1,INT_FRAME_SIZE
std r11,0(r1)
li r12,0
std r12,0(r11)
ld r2,PACATOC(r13)
1: addi r3,r1,STACK_FRAME_OVERHEAD
bl .kernel_bad_stack
b 1b
/*
* Setup the initial TLB for a core. This current implementation
* assume that whatever we are running off will not conflict with
* the new mapping at PAGE_OFFSET.
*/
_GLOBAL(initial_tlb_book3e)
/* Look for the first TLB with IPROT set */
mfspr r4,SPRN_TLB0CFG
andi. r3,r4,TLBnCFG_IPROT
lis r3,MAS0_TLBSEL(0)@h
bne found_iprot
mfspr r4,SPRN_TLB1CFG
andi. r3,r4,TLBnCFG_IPROT
lis r3,MAS0_TLBSEL(1)@h
bne found_iprot
mfspr r4,SPRN_TLB2CFG
andi. r3,r4,TLBnCFG_IPROT
lis r3,MAS0_TLBSEL(2)@h
bne found_iprot
lis r3,MAS0_TLBSEL(3)@h
mfspr r4,SPRN_TLB3CFG
/* fall through */
found_iprot:
andi. r5,r4,TLBnCFG_HES
bne have_hes
mflr r8 /* save LR */
/* 1. Find the index of the entry we're executing in
*
* r3 = MAS0_TLBSEL (for the iprot array)
* r4 = SPRN_TLBnCFG
*/
bl invstr /* Find our address */
invstr: mflr r6 /* Make it accessible */
mfmsr r7
rlwinm r5,r7,27,31,31 /* extract MSR[IS] */
mfspr r7,SPRN_PID
slwi r7,r7,16
or r7,r7,r5
mtspr SPRN_MAS6,r7
tlbsx 0,r6 /* search MSR[IS], SPID=PID */
mfspr r3,SPRN_MAS0
rlwinm r5,r3,16,20,31 /* 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
*
* r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
* r4 = SPRN_TLBnCFG
* r5 = ESEL of entry we are running in
*/
andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */
li r6,0 /* Set Entry counter to 0 */
1: mr r7,r3 /* Set MAS0(TLBSEL) */
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 r5,r6
beq skpinv /* Dont update the current execution TLB */
mtspr SPRN_MAS1,r7
tlbwe
isync
skpinv: addi r6,r6,1 /* Increment */
cmpw r6,r4 /* Are we done? */
bne 1b /* If not, repeat */
/* Invalidate all TLBs */
PPC_TLBILX_ALL(0,0)
sync
isync
/* 3. Setup a temp mapping and jump to it
*
* r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
* r5 = ESEL of entry we are running in
*/
andi. r7,r5,0x1 /* Find an entry not used and is non-zero */
addi r7,r7,0x1
mr r4,r3 /* Set MAS0(TLBSEL) = 1 */
mtspr SPRN_MAS0,r4
tlbre
rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */
mtspr SPRN_MAS0,r4
mfspr r7,SPRN_MAS1
xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */
mtspr SPRN_MAS1,r6
tlbwe
mfmsr r6
xori r6,r6,MSR_IS
mtspr SPRN_SRR1,r6
bl 1f /* Find our address */
1: mflr r6
addi r6,r6,(2f - 1b)
mtspr SPRN_SRR0,r6
rfi
2:
/* 4. Clear out PIDs & Search info
*
* r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
* r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
* r5 = MAS3
*/
li r6,0
mtspr SPRN_MAS6,r6
mtspr SPRN_PID,r6
/* 5. Invalidate mapping we started in
*
* r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
* r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
* r5 = MAS3
*/
mtspr SPRN_MAS0,r3
tlbre
mfspr r6,SPRN_MAS1
rlwinm r6,r6,0,2,0 /* clear IPROT */
mtspr SPRN_MAS1,r6
tlbwe
/* Invalidate TLB1 */
PPC_TLBILX_ALL(0,0)
sync
isync
/* The mapping only needs to be cache-coherent on SMP */
#ifdef CONFIG_SMP
#define M_IF_SMP MAS2_M
#else
#define M_IF_SMP 0
#endif
/* 6. Setup KERNELBASE mapping in TLB[0]
*
* r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
* r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
* r5 = MAS3
*/
rlwinm r3,r3,0,16,3 /* clear ESEL */
mtspr SPRN_MAS0,r3
lis r6,(MAS1_VALID|MAS1_IPROT)@h
ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l
mtspr SPRN_MAS1,r6
LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | M_IF_SMP)
mtspr SPRN_MAS2,r6
rlwinm r5,r5,0,0,25
ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX
mtspr SPRN_MAS3,r5
li r5,-1
rlwinm r5,r5,0,0,25
tlbwe
/* 7. Jump to KERNELBASE mapping
*
* r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
*/
/* Now we branch the new virtual address mapped by this entry */
LOAD_REG_IMMEDIATE(r6,2f)
lis r7,MSR_KERNEL@h
ori r7,r7,MSR_KERNEL@l
mtspr SPRN_SRR0,r6
mtspr SPRN_SRR1,r7
rfi /* start execution out of TLB1[0] entry */
2:
/* 8. Clear out the temp mapping
*
* r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in
*/
mtspr SPRN_MAS0,r4
tlbre
mfspr r5,SPRN_MAS1
rlwinm r5,r5,0,2,0 /* clear IPROT */
mtspr SPRN_MAS1,r5
tlbwe
/* Invalidate TLB1 */
PPC_TLBILX_ALL(0,0)
sync
isync
/* We translate LR and return */
tovirt(r8,r8)
mtlr r8
blr
have_hes:
/* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the
* kernel linear mapping. We also set MAS8 once for all here though
* that will have to be made dependent on whether we are running under
* a hypervisor I suppose.
*/
ori r3,r3,MAS0_HES | MAS0_WQ_ALLWAYS
mtspr SPRN_MAS0,r3
lis r3,(MAS1_VALID | MAS1_IPROT)@h
ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT
mtspr SPRN_MAS1,r3
LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M)
mtspr SPRN_MAS2,r3
li r3,MAS3_SR | MAS3_SW | MAS3_SX
mtspr SPRN_MAS7_MAS3,r3
li r3,0
mtspr SPRN_MAS8,r3
/* Write the TLB entry */
tlbwe
/* Now we branch the new virtual address mapped by this entry */
LOAD_REG_IMMEDIATE(r3,1f)
mtctr r3
bctr
1: /* We are now running at PAGE_OFFSET, clean the TLB of everything
* else (XXX we should scan for bolted crap from the firmware too)
*/
PPC_TLBILX(0,0,0)
sync
isync
/* We translate LR and return */
mflr r3
tovirt(r3,r3)
mtlr r3
blr
/*
* Main entry (boot CPU, thread 0)
*
* We enter here from head_64.S, possibly after the prom_init trampoline
* with r3 and r4 already saved to r31 and 30 respectively and in 64 bits
* mode. Anything else is as it was left by the bootloader
*
* Initial requirements of this port:
*
* - Kernel loaded at 0 physical
* - A good lump of memory mapped 0:0 by UTLB entry 0
* - MSR:IS & MSR:DS set to 0
*
* Note that some of the above requirements will be relaxed in the future
* as the kernel becomes smarter at dealing with different initial conditions
* but for now you have to be careful
*/
_GLOBAL(start_initialization_book3e)
mflr r28
/* First, we need to setup some initial TLBs to map the kernel
* text, data and bss at PAGE_OFFSET. We don't have a real mode
* and always use AS 0, so we just set it up to match our link
* address and never use 0 based addresses.
*/
bl .initial_tlb_book3e
/* Init global core bits */
bl .init_core_book3e
/* Init per-thread bits */
bl .init_thread_book3e
/* Return to common init code */
tovirt(r28,r28)
mtlr r28
blr
/*
* Secondary core/processor entry
*
* This is entered for thread 0 of a secondary core, all other threads
* are expected to be stopped. It's similar to start_initialization_book3e
* except that it's generally entered from the holding loop in head_64.S
* after CPUs have been gathered by Open Firmware.
*
* We assume we are in 32 bits mode running with whatever TLB entry was
* set for us by the firmware or POR engine.
*/
_GLOBAL(book3e_secondary_core_init_tlb_set)
li r4,1
b .generic_secondary_smp_init
_GLOBAL(book3e_secondary_core_init)
mflr r28
/* Do we need to setup initial TLB entry ? */
cmplwi r4,0
bne 2f
/* Setup TLB for this core */
bl .initial_tlb_book3e
/* We can return from the above running at a different
* address, so recalculate r2 (TOC)
*/
bl .relative_toc
/* Init global core bits */
2: bl .init_core_book3e
/* Init per-thread bits */
3: bl .init_thread_book3e
/* Return to common init code at proper virtual address.
*
* Due to various previous assumptions, we know we entered this
* function at either the final PAGE_OFFSET mapping or using a
* 1:1 mapping at 0, so we don't bother doing a complicated check
* here, we just ensure the return address has the right top bits.
*
* Note that if we ever want to be smarter about where we can be
* started from, we have to be careful that by the time we reach
* the code below we may already be running at a different location
* than the one we were called from since initial_tlb_book3e can
* have moved us already.
*/
cmpdi cr0,r28,0
blt 1f
lis r3,PAGE_OFFSET@highest
sldi r3,r3,32
or r28,r28,r3
1: mtlr r28
blr
_GLOBAL(book3e_secondary_thread_init)
mflr r28
b 3b
_STATIC(init_core_book3e)
/* Establish the interrupt vector base */
LOAD_REG_IMMEDIATE(r3, interrupt_base_book3e)
mtspr SPRN_IVPR,r3
sync
blr
_STATIC(init_thread_book3e)
lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h
mtspr SPRN_EPCR,r3
/* Make sure interrupts are off */
wrteei 0
/* disable all timers and clear out status */
li r3,0
mtspr SPRN_TCR,r3
mfspr r3,SPRN_TSR
mtspr SPRN_TSR,r3
blr
_GLOBAL(__setup_base_ivors)
SET_IVOR(0, 0x020) /* Critical Input */
SET_IVOR(1, 0x000) /* Machine Check */
SET_IVOR(2, 0x060) /* Data Storage */
SET_IVOR(3, 0x080) /* Instruction Storage */
SET_IVOR(4, 0x0a0) /* External Input */
SET_IVOR(5, 0x0c0) /* Alignment */
SET_IVOR(6, 0x0e0) /* Program */
SET_IVOR(7, 0x100) /* FP Unavailable */
SET_IVOR(8, 0x120) /* System Call */
SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */
SET_IVOR(10, 0x160) /* Decrementer */
SET_IVOR(11, 0x180) /* Fixed Interval Timer */
SET_IVOR(12, 0x1a0) /* Watchdog Timer */
SET_IVOR(13, 0x1c0) /* Data TLB Error */
SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
SET_IVOR(15, 0x040) /* Debug */
sync
blr
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