/* 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_SRR0 0
#define SPECIAL_EXC_SRR1 1
#define SPECIAL_EXC_SPRG_GEN 2
#define SPECIAL_EXC_SPRG_TLB 3
#define SPECIAL_EXC_MAS0 4
#define SPECIAL_EXC_MAS1 5
#define SPECIAL_EXC_MAS2 6
#define SPECIAL_EXC_MAS3 7
#define SPECIAL_EXC_MAS6 8
#define SPECIAL_EXC_MAS7 9
#define SPECIAL_EXC_MAS5 10 /* E.HV only */
#define SPECIAL_EXC_MAS8 11 /* E.HV only */
#define SPECIAL_EXC_IRQHAPPENED 12
#define SPECIAL_EXC_DEAR 13
#define SPECIAL_EXC_ESR 14
#define SPECIAL_EXC_SOFTE 15
#define SPECIAL_EXC_CSRR0 16
#define SPECIAL_EXC_CSRR1 17 /* must be even to keep 16-byte stack alignment */
#define SPECIAL_EXC_END 18
SYM_CODE_START_LOCAL(special_reg_save) /* * We only need (or have stack space) to save this stuff if * we interrupted the kernel.
*/ ld r3,_MSR(r1)
andi. r3,r3,MSR_PR
bnelr
/* * Advance to the next TLB exception frame for handler * types that don't do it automatically.
*/
LOAD_REG_ADDR(r11,extlb_level_exc)
lwz r12,0(r11)
mfspr r10,SPRN_SPRG_TLB_EXFRAME
add r10,r10,r12
mtspr SPRN_SPRG_TLB_EXFRAME,r10
/* * Save registers needed to allow nesting of certain exceptions * (such as TLB misses) inside special exception levels
*/
mfspr r10,SPRN_SRR0
SPECIAL_EXC_STORE(r10,SRR0)
mfspr r10,SPRN_SRR1
SPECIAL_EXC_STORE(r10,SRR1)
mfspr r10,SPRN_SPRG_GEN_SCRATCH
SPECIAL_EXC_STORE(r10,SPRG_GEN)
mfspr r10,SPRN_SPRG_TLB_SCRATCH
SPECIAL_EXC_STORE(r10,SPRG_TLB)
mfspr r10,SPRN_MAS0
SPECIAL_EXC_STORE(r10,MAS0)
mfspr r10,SPRN_MAS1
SPECIAL_EXC_STORE(r10,MAS1)
mfspr r10,SPRN_MAS2
SPECIAL_EXC_STORE(r10,MAS2)
mfspr r10,SPRN_MAS3
SPECIAL_EXC_STORE(r10,MAS3)
mfspr r10,SPRN_MAS6
SPECIAL_EXC_STORE(r10,MAS6)
mfspr r10,SPRN_MAS7
SPECIAL_EXC_STORE(r10,MAS7)
BEGIN_FTR_SECTION
mfspr r10,SPRN_MAS5
SPECIAL_EXC_STORE(r10,MAS5)
mfspr r10,SPRN_MAS8
SPECIAL_EXC_STORE(r10,MAS8)
/* MAS5/8 could have inappropriate values if we interrupted KVM code */
li r10,0
mtspr SPRN_MAS5,r10
mtspr SPRN_MAS8,r10
END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
mfspr r10,SPRN_DEAR
SPECIAL_EXC_STORE(r10,DEAR)
mfspr r10,SPRN_ESR
SPECIAL_EXC_STORE(r10,ESR)
LOAD_REG_ADDR(r11,extlb_level_exc)
lwz r12,0(r11)
mfspr r10,SPRN_SPRG_TLB_EXFRAME sub r10,r10,r12
mtspr SPRN_SPRG_TLB_EXFRAME,r10
/* * It's possible that the special level exception interrupted a * TLB miss handler, and inserted the same entry that the * interrupted handler was about to insert. On CPUs without TLB * write conditional, this can result in a duplicate TLB entry. * Wipe all non-bolted entries to be safe. * * Note that this doesn't protect against any TLB misses * we may take accessing the stack from here to the end of * the special level exception. It's not clear how we can * reasonably protect against that, but only CPUs with * neither TLB write conditional nor bolted kernel memory * are affected. Do any such CPUs even exist?
*/
PPC_TLBILX_ALL(0,R0)
/* Exception prolog code for all exceptions */
#define EXCEPTION_PROLOG(n, intnum, 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 */ \
mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \
DO_KVM intnum,SPRN_##type##_SRR1; /* KVM hook */ \
stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \
addition; /* additional code for that exc. */ \
std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \
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: type##_BTB_FLUSH \
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 */
/* Variants of the "addition" argument for the prolog
*/
#define PROLOG_ADDITION_NONE_GEN(n)
#define PROLOG_ADDITION_NONE_GDBELL(n)
#define PROLOG_ADDITION_NONE_CRIT(n)
#define PROLOG_ADDITION_NONE_DBG(n)
#define PROLOG_ADDITION_NONE_MC(n)
#define PROLOG_ADDITION_MASKABLE_GEN(n) \
lbz r10,PACAIRQSOFTMASK(r13); /* are irqs soft-masked? */ \
andi. r10,r10,IRQS_DISABLED; /* yes -> go out of line */ \
bne masked_interrupt_book3e_##n
/* * Additional regs must be re-loaded from paca before EXCEPTION_COMMON* is * called, because that does SAVE_NVGPRS which must see the original register * values, otherwise the scratch values might be restored when exiting the * interrupt.
*/
#define PROLOG_ADDITION_2REGS_GEN(n) \
std r14,PACA_EXGEN+EX_R14(r13); \
std r15,PACA_EXGEN+EX_R15(r13)
/* Core exception code for all exceptions except TLB misses. */
#define EXCEPTION_COMMON_LVL(n, scratch, excf) \
exc_##n##_common: \
SAVE_GPR(0, r1); /* save r0 in stackframe */ \
SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \
std r10,_NIP(r1); /* save SRR0 to stackframe */ \
std r11,_MSR(r1); /* save SRR1 to stackframe */ \
beq 2f; /* if from kernel mode */ \
2: ld r3,excf+EX_R10(r13); /* get back r10 */ \ ld r4,excf+EX_R11(r13); /* get back r11 */ \
mfspr r5,scratch; /* get back r13 */ \
SAVE_GPR(12, r1); /* save r12 in stackframe */ \
LOAD_PACA_TOC(); /* 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,PACAIRQSOFTMASK(r13); /* get current IRQ softe */ \
LOAD_REG_IMMEDIATE(r12, STACK_FRAME_REGS_MARKER); \
ZEROIZE_GPR(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); /* regs.trap vector */ \
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_INT_FRAME_MARKER(r1); /* mark the frame */ \
std r3,_TRAP(r1); /* set trap number */ \
std r0,RESULT(r1); /* clear regs->result */ \
SAVE_NVGPRS(r1); \
SANITIZE_NVGPRS(); /* minimise speculation influence */
/* 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 */
/* WARNING: If you change the layout of this stub, make sure you check * the debug exception handler which handles single stepping * into exceptions from userspace, and the MM code in * arch/powerpc/mm/tlb_nohash.c which patches the branch here * and would need to be updated if that branch is moved
*/
#define EXCEPTION_STUB(loc, label) \
. = interrupt_base_book3e + loc; \
nop; /* To make debug interrupts happy */ \
b exc_##label##_book3e;
/* Used by asynchronous interrupt that may happen in the idle loop. * * This check if the thread was in the idle loop, and if yes, returns * to the caller rather than the PC. This is to avoid a race if * interrupts happen before the wait instruction.
*/
#define CHECK_NAPPING() \ ld r11, PACA_THREAD_INFO(r13); \ ld r10,TI_LOCAL_FLAGS(r11); \
andi. r9,r10,_TLF_NAPPING; \
beq+ 1f; \ ld r8,_LINK(r1); \
rlwinm r7,r10,0,~_TLF_NAPPING; \
std r8,_NIP(r1); \
std r7,TI_LOCAL_FLAGS(r11); \
1:
/* Alignment */
START_EXCEPTION(alignment);
NORMAL_EXCEPTION_PROLOG(0x600, BOOKE_INTERRUPT_ALIGNMENT,
PROLOG_ADDITION_2REGS)
mfspr r14,SPRN_DEAR
mfspr r15,SPRN_ESR
std r14,_DEAR(r1)
std r15,_ESR(r1) ld r14,PACA_EXGEN+EX_R14(r13) ld r15,PACA_EXGEN+EX_R15(r13)
EXCEPTION_COMMON(0x600)
b alignment_more /* no room, go out of line */
/* Floating Point Unavailable Interrupt */
START_EXCEPTION(fp_unavailable);
NORMAL_EXCEPTION_PROLOG(0x800, BOOKE_INTERRUPT_FP_UNAVAIL,
PROLOG_ADDITION_NONE) /* we can probably do a shorter exception entry for that one... */
EXCEPTION_COMMON(0x800) ld r12,_MSR(r1)
andi. r0,r12,MSR_PR;
beq- 1f
bl load_up_fpu
b fast_interrupt_return
1: addi r3,r1,STACK_INT_FRAME_REGS
bl kernel_fp_unavailable_exception
b interrupt_return
/* Altivec Unavailable Interrupt */
START_EXCEPTION(altivec_unavailable);
NORMAL_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_ALTIVEC_UNAVAIL,
PROLOG_ADDITION_NONE) /* we can probably do a shorter exception entry for that one... */
EXCEPTION_COMMON(0x200)
#ifdef CONFIG_ALTIVEC
BEGIN_FTR_SECTION ld r12,_MSR(r1)
andi. r0,r12,MSR_PR;
beq- 1f
bl load_up_altivec
b fast_interrupt_return
1:
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
addi r3,r1,STACK_INT_FRAME_REGS
bl altivec_unavailable_exception
b interrupt_return
/* Debug exception as a critical interrupt*/
START_EXCEPTION(debug_crit);
CRIT_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
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.
*/
/* here it looks like we got an inappropriate debug exception. */
lis r14,(DBSR_IC|DBSR_BT)@h /* clear the 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 r14,SPRN_DBSR
std r14,_DSISR(r1) ld r14,PACA_EXCRIT+EX_R14(r13) ld r15,PACA_EXCRIT+EX_R15(r13)
EXCEPTION_COMMON_CRIT(0xd00)
addi r3,r1,STACK_INT_FRAME_REGS
bl DebugException
REST_NVGPRS(r1)
b interrupt_return
kernel_dbg_exc:
b . /* NYI */
/* Debug exception as a debug interrupt*/
START_EXCEPTION(debug_debug);
DBG_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
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 DSRR1 value and clearing the debug status.
*/
/* here it looks like we got an inappropriate debug exception. */
lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */
rlwinm r11,r11,0,~MSR_DE /* clear DE in the DSRR1 value */
mtspr SPRN_DBSR,r14
mtspr SPRN_DSRR1,r11
lwz r10,PACA_EXDBG+EX_CR(r13) /* restore registers */ ld r1,PACA_EXDBG+EX_R1(r13) ld r14,PACA_EXDBG+EX_R14(r13) ld r15,PACA_EXDBG+EX_R15(r13)
mtcr r10 ld r10,PACA_EXDBG+EX_R10(r13) /* restore registers */ ld r11,PACA_EXDBG+EX_R11(r13)
mfspr r13,SPRN_SPRG_DBG_SCRATCH
rfdi
/* 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 r14,SPRN_DBSR
std r14,_DSISR(r1) ld r14,PACA_EXDBG+EX_R14(r13) ld r15,PACA_EXDBG+EX_R15(r13)
EXCEPTION_COMMON_DBG(0xd08)
addi r3,r1,STACK_INT_FRAME_REGS
bl DebugException
REST_NVGPRS(r1)
b interrupt_return
START_EXCEPTION(perfmon);
NORMAL_EXCEPTION_PROLOG(0x260, BOOKE_INTERRUPT_PERFORMANCE_MONITOR,
PROLOG_ADDITION_NONE)
EXCEPTION_COMMON(0x260)
CHECK_NAPPING()
addi r3,r1,STACK_INT_FRAME_REGS /* * XXX: Returning from performance_monitor_exception taken as a * soft-NMI (Linux irqs disabled) may be risky to use interrupt_return * and could cause bugs in return or elsewhere. That case should just * restore registers and return. There is a workaround for one known * problem in interrupt_exit_kernel_prepare().
*/
bl performance_monitor_exception
b interrupt_return
/* * An interrupt came in while soft-disabled; We mark paca->irq_happened * accordingly and if the interrupt is level sensitive, we hard disable * hard disable (full_mask) corresponds to PACA_IRQ_MUST_HARD_MASK, so * keep these in synch.
*/
/* * 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
*/
SYM_CODE_START_LOCAL(storage_fault_common)
addi r3,r1,STACK_INT_FRAME_REGS
bl do_page_fault
b interrupt_return
SYM_CODE_END(storage_fault_common)
/* * Alignment exception doesn't fit entirely in the 0x100 bytes so it * continues here.
*/
SYM_CODE_START_LOCAL(alignment_more)
addi r3,r1,STACK_INT_FRAME_REGS
bl alignment_exception
REST_NVGPRS(r1)
b interrupt_return
SYM_CODE_END(alignment_more)
/* * 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(0x220)
BAD_STACK_TRAMPOLINE(0x260)
BAD_STACK_TRAMPOLINE(0x280)
BAD_STACK_TRAMPOLINE(0x2a0)
BAD_STACK_TRAMPOLINE(0x2c0)
BAD_STACK_TRAMPOLINE(0x2e0)
BAD_STACK_TRAMPOLINE(0x300)
BAD_STACK_TRAMPOLINE(0x310)
BAD_STACK_TRAMPOLINE(0x320)
BAD_STACK_TRAMPOLINE(0x340)
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(0xd08)
BAD_STACK_TRAMPOLINE(0xe00)
BAD_STACK_TRAMPOLINE(0xf00)
BAD_STACK_TRAMPOLINE(0xf20)
_GLOBAL(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,_DEAR(r1)
std r11,_ESR(r1)
SAVE_GPR(0, r1); /* save r0 in stackframe */ \
SAVE_GPRS(2, 9, r1); /* save r2 - 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 */ \
SAVE_GPR(12, 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_NVGPRS(r1)
lhz r12,PACA_TRAP_SAVE(r13)
std r12,_TRAP(r1)
addi r11,r1,INT_FRAME_SIZE
std r11,0(r1)
ZEROIZE_GPR(12)
std r12,0(r11)
LOAD_PACA_TOC()
1: addi r3,r1,STACK_INT_FRAME_REGS
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
/* 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,R0)
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
/* 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,r6,0,2,31 /* clear IPROT and VALID */
mtspr SPRN_MAS1,r6
tlbwe
sync
isync
/* 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
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 */
bcl 20,31,$+4 /* Find our address */
1: mflr r6
addi r6,r6,(2f - 1b)
tovirt(r6,r6)
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,r5,0,2,31 /* clear IPROT and VALID */
mtspr SPRN_MAS1,r5
tlbwe
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.
*/
/* BEWARE, MAGIC * This code is called as an ordinary function on the boot CPU. But to * avoid duplication, this code is also used in SCOM bringup of * secondary CPUs. We read the code between the initial_tlb_code_start * and initial_tlb_code_end labels one instruction at a time and RAM it * into the new core via SCOM. That doesn't process branches, so there * must be none between those two labels. It also means if this code * ever takes any parameters, the SCOM code must also be updated to * provide them.
*/
_GLOBAL(a2_tlbinit_code_start)
ori r11,r3,MAS0_WQ_ALLWAYS
oris r11,r11,MAS0_ESEL(3)@h /* Use way 3: workaround A2 erratum 376 */
mtspr SPRN_MAS0,r11
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
/* Now we branch the new virtual address mapped by this entry */
#ifdef CONFIG_RELOCATABLE
__LOAD_PACA_TOC(r5)
LOAD_REG_ADDR_ALTTOC(r3, r5, 1f)
#else
LOAD_REG_IMMEDIATE_SYM(r3, r5, 1f)
#endif
mtctr r3
bctr
1: /* We are now running at PAGE_OFFSET, clean the TLB of everything * else (including IPROTed things left by firmware) * r4 = TLBnCFG * r3 = current address (more or less)
*/
/* 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
/* 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
_GLOBAL(init_core_book3e) /* Establish the interrupt vector base */
tovirt(r2,r2)
LOAD_REG_ADDR(r3, interrupt_base_book3e)
mtspr SPRN_IVPR,r3
sync
blr
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