2 * Boot code and exception vectors for Book3E processors
4 * Copyright (C) 2007 Ben. Herrenschmidt (benh@kernel.crashing.org), IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
12 #include <linux/threads.h>
15 #include <asm/ppc_asm.h>
16 #include <asm/asm-offsets.h>
17 #include <asm/cputable.h>
18 #include <asm/setup.h>
19 #include <asm/thread_info.h>
20 #include <asm/reg_a2.h>
21 #include <asm/exception-64e.h>
23 #include <asm/irqflags.h>
24 #include <asm/ptrace.h>
25 #include <asm/ppc-opcode.h>
27 #include <asm/hw_irq.h>
28 #include <asm/kvm_asm.h>
29 #include <asm/kvm_booke_hv_asm.h>
30 #include <asm/feature-fixups.h>
32 /* XXX This will ultimately add space for a special exception save
33 * structure used to save things like SRR0/SRR1, SPRGs, MAS, etc...
34 * when taking special interrupts. For now we don't support that,
35 * special interrupts from within a non-standard level will probably
38 #define SPECIAL_EXC_SRR0 0
39 #define SPECIAL_EXC_SRR1 1
40 #define SPECIAL_EXC_SPRG_GEN 2
41 #define SPECIAL_EXC_SPRG_TLB 3
42 #define SPECIAL_EXC_MAS0 4
43 #define SPECIAL_EXC_MAS1 5
44 #define SPECIAL_EXC_MAS2 6
45 #define SPECIAL_EXC_MAS3 7
46 #define SPECIAL_EXC_MAS6 8
47 #define SPECIAL_EXC_MAS7 9
48 #define SPECIAL_EXC_MAS5 10 /* E.HV only */
49 #define SPECIAL_EXC_MAS8 11 /* E.HV only */
50 #define SPECIAL_EXC_IRQHAPPENED 12
51 #define SPECIAL_EXC_DEAR 13
52 #define SPECIAL_EXC_ESR 14
53 #define SPECIAL_EXC_SOFTE 15
54 #define SPECIAL_EXC_CSRR0 16
55 #define SPECIAL_EXC_CSRR1 17
56 /* must be even to keep 16-byte stack alignment */
57 #define SPECIAL_EXC_END 18
59 #define SPECIAL_EXC_FRAME_SIZE (INT_FRAME_SIZE + SPECIAL_EXC_END * 8)
60 #define SPECIAL_EXC_FRAME_OFFS (INT_FRAME_SIZE - 288)
62 #define SPECIAL_EXC_STORE(reg, name) \
63 std reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1)
65 #define SPECIAL_EXC_LOAD(reg, name) \
66 ld reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1)
69 lbz r9,PACAIRQHAPPENED(r13)
70 RECONCILE_IRQ_STATE(r3,r4)
73 * We only need (or have stack space) to save this stuff if
74 * we interrupted the kernel.
81 * Advance to the next TLB exception frame for handler
82 * types that don't do it automatically.
84 LOAD_REG_ADDR(r11,extlb_level_exc)
86 mfspr r10,SPRN_SPRG_TLB_EXFRAME
88 mtspr SPRN_SPRG_TLB_EXFRAME,r10
91 * Save registers needed to allow nesting of certain exceptions
92 * (such as TLB misses) inside special exception levels
95 SPECIAL_EXC_STORE(r10,SRR0)
97 SPECIAL_EXC_STORE(r10,SRR1)
98 mfspr r10,SPRN_SPRG_GEN_SCRATCH
99 SPECIAL_EXC_STORE(r10,SPRG_GEN)
100 mfspr r10,SPRN_SPRG_TLB_SCRATCH
101 SPECIAL_EXC_STORE(r10,SPRG_TLB)
103 SPECIAL_EXC_STORE(r10,MAS0)
105 SPECIAL_EXC_STORE(r10,MAS1)
107 SPECIAL_EXC_STORE(r10,MAS2)
109 SPECIAL_EXC_STORE(r10,MAS3)
111 SPECIAL_EXC_STORE(r10,MAS6)
113 SPECIAL_EXC_STORE(r10,MAS7)
116 SPECIAL_EXC_STORE(r10,MAS5)
118 SPECIAL_EXC_STORE(r10,MAS8)
120 /* MAS5/8 could have inappropriate values if we interrupted KVM code */
124 END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
125 SPECIAL_EXC_STORE(r9,IRQHAPPENED)
128 SPECIAL_EXC_STORE(r10,DEAR)
130 SPECIAL_EXC_STORE(r10,ESR)
132 lbz r10,PACAIRQSOFTMASK(r13)
133 SPECIAL_EXC_STORE(r10,SOFTE)
135 SPECIAL_EXC_STORE(r10,CSRR0)
137 SPECIAL_EXC_STORE(r10,CSRR1)
141 ret_from_level_except:
148 LOAD_REG_ADDR(r11,extlb_level_exc)
150 mfspr r10,SPRN_SPRG_TLB_EXFRAME
152 mtspr SPRN_SPRG_TLB_EXFRAME,r10
155 * It's possible that the special level exception interrupted a
156 * TLB miss handler, and inserted the same entry that the
157 * interrupted handler was about to insert. On CPUs without TLB
158 * write conditional, this can result in a duplicate TLB entry.
159 * Wipe all non-bolted entries to be safe.
161 * Note that this doesn't protect against any TLB misses
162 * we may take accessing the stack from here to the end of
163 * the special level exception. It's not clear how we can
164 * reasonably protect against that, but only CPUs with
165 * neither TLB write conditional nor bolted kernel memory
166 * are affected. Do any such CPUs even exist?
172 SPECIAL_EXC_LOAD(r10,SRR0)
174 SPECIAL_EXC_LOAD(r10,SRR1)
176 SPECIAL_EXC_LOAD(r10,SPRG_GEN)
177 mtspr SPRN_SPRG_GEN_SCRATCH,r10
178 SPECIAL_EXC_LOAD(r10,SPRG_TLB)
179 mtspr SPRN_SPRG_TLB_SCRATCH,r10
180 SPECIAL_EXC_LOAD(r10,MAS0)
182 SPECIAL_EXC_LOAD(r10,MAS1)
184 SPECIAL_EXC_LOAD(r10,MAS2)
186 SPECIAL_EXC_LOAD(r10,MAS3)
188 SPECIAL_EXC_LOAD(r10,MAS6)
190 SPECIAL_EXC_LOAD(r10,MAS7)
193 SPECIAL_EXC_LOAD(r10,MAS5)
195 SPECIAL_EXC_LOAD(r10,MAS8)
197 END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
199 lbz r6,PACAIRQSOFTMASK(r13)
202 /* Interrupts had better not already be enabled... */
203 tweqi r6,IRQS_ENABLED
205 andi. r6,r5,IRQS_DISABLED
209 stb r5,PACAIRQSOFTMASK(r13)
212 * Restore PACAIRQHAPPENED rather than setting it based on
213 * the return MSR[EE], since we could have interrupted
214 * __check_irq_replay() or other inconsistent transitory
215 * states that must remain that way.
217 SPECIAL_EXC_LOAD(r10,IRQHAPPENED)
218 stb r10,PACAIRQHAPPENED(r13)
220 SPECIAL_EXC_LOAD(r10,DEAR)
222 SPECIAL_EXC_LOAD(r10,ESR)
225 stdcx. r0,0,r1 /* to clear the reservation */
237 .macro ret_from_level srr0 srr1 paca_ex scratch
238 bl ret_from_level_except
251 std r10,\paca_ex+EX_R10(r13);
252 std r11,\paca_ex+EX_R11(r13);
259 ld r10,\paca_ex+EX_R10(r13)
260 ld r11,\paca_ex+EX_R11(r13)
264 ret_from_crit_except:
265 ret_from_level SPRN_CSRR0 SPRN_CSRR1 PACA_EXCRIT SPRN_SPRG_CRIT_SCRATCH
269 ret_from_level SPRN_MCSRR0 SPRN_MCSRR1 PACA_EXMC SPRN_SPRG_MC_SCRATCH
272 /* Exception prolog code for all exceptions */
273 #define EXCEPTION_PROLOG(n, intnum, type, addition) \
274 mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \
275 mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \
276 std r10,PACA_EX##type+EX_R10(r13); \
277 std r11,PACA_EX##type+EX_R11(r13); \
278 mfcr r10; /* save CR */ \
279 mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \
280 DO_KVM intnum,SPRN_##type##_SRR1; /* KVM hook */ \
281 stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \
282 addition; /* additional code for that exc. */ \
283 std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \
284 type##_SET_KSTACK; /* get special stack if necessary */\
285 andi. r10,r11,MSR_PR; /* save stack pointer */ \
286 beq 1f; /* branch around if supervisor */ \
287 ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\
288 1: type##_BTB_FLUSH \
289 cmpdi cr1,r1,0; /* check if SP makes sense */ \
290 bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \
291 mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */
293 /* Exception type-specific macros */
294 #define GEN_SET_KSTACK \
295 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */
296 #define SPRN_GEN_SRR0 SPRN_SRR0
297 #define SPRN_GEN_SRR1 SPRN_SRR1
299 #define GDBELL_SET_KSTACK GEN_SET_KSTACK
300 #define SPRN_GDBELL_SRR0 SPRN_GSRR0
301 #define SPRN_GDBELL_SRR1 SPRN_GSRR1
303 #define CRIT_SET_KSTACK \
304 ld r1,PACA_CRIT_STACK(r13); \
305 subi r1,r1,SPECIAL_EXC_FRAME_SIZE
306 #define SPRN_CRIT_SRR0 SPRN_CSRR0
307 #define SPRN_CRIT_SRR1 SPRN_CSRR1
309 #define DBG_SET_KSTACK \
310 ld r1,PACA_DBG_STACK(r13); \
311 subi r1,r1,SPECIAL_EXC_FRAME_SIZE
312 #define SPRN_DBG_SRR0 SPRN_DSRR0
313 #define SPRN_DBG_SRR1 SPRN_DSRR1
315 #define MC_SET_KSTACK \
316 ld r1,PACA_MC_STACK(r13); \
317 subi r1,r1,SPECIAL_EXC_FRAME_SIZE
318 #define SPRN_MC_SRR0 SPRN_MCSRR0
319 #define SPRN_MC_SRR1 SPRN_MCSRR1
321 #ifdef CONFIG_PPC_FSL_BOOK3E
322 #define GEN_BTB_FLUSH \
323 START_BTB_FLUSH_SECTION \
327 END_BTB_FLUSH_SECTION
329 #define CRIT_BTB_FLUSH \
330 START_BTB_FLUSH_SECTION \
332 END_BTB_FLUSH_SECTION
334 #define DBG_BTB_FLUSH CRIT_BTB_FLUSH
335 #define MC_BTB_FLUSH CRIT_BTB_FLUSH
336 #define GDBELL_BTB_FLUSH GEN_BTB_FLUSH
338 #define GEN_BTB_FLUSH
339 #define CRIT_BTB_FLUSH
340 #define DBG_BTB_FLUSH
342 #define GDBELL_BTB_FLUSH
345 #define NORMAL_EXCEPTION_PROLOG(n, intnum, addition) \
346 EXCEPTION_PROLOG(n, intnum, GEN, addition##_GEN(n))
348 #define CRIT_EXCEPTION_PROLOG(n, intnum, addition) \
349 EXCEPTION_PROLOG(n, intnum, CRIT, addition##_CRIT(n))
351 #define DBG_EXCEPTION_PROLOG(n, intnum, addition) \
352 EXCEPTION_PROLOG(n, intnum, DBG, addition##_DBG(n))
354 #define MC_EXCEPTION_PROLOG(n, intnum, addition) \
355 EXCEPTION_PROLOG(n, intnum, MC, addition##_MC(n))
357 #define GDBELL_EXCEPTION_PROLOG(n, intnum, addition) \
358 EXCEPTION_PROLOG(n, intnum, GDBELL, addition##_GDBELL(n))
360 /* Variants of the "addition" argument for the prolog
362 #define PROLOG_ADDITION_NONE_GEN(n)
363 #define PROLOG_ADDITION_NONE_GDBELL(n)
364 #define PROLOG_ADDITION_NONE_CRIT(n)
365 #define PROLOG_ADDITION_NONE_DBG(n)
366 #define PROLOG_ADDITION_NONE_MC(n)
368 #define PROLOG_ADDITION_MASKABLE_GEN(n) \
369 lbz r10,PACAIRQSOFTMASK(r13); /* are irqs soft-masked? */ \
370 andi. r10,r10,IRQS_DISABLED; /* yes -> go out of line */ \
371 bne masked_interrupt_book3e_##n
373 #define PROLOG_ADDITION_2REGS_GEN(n) \
374 std r14,PACA_EXGEN+EX_R14(r13); \
375 std r15,PACA_EXGEN+EX_R15(r13)
377 #define PROLOG_ADDITION_1REG_GEN(n) \
378 std r14,PACA_EXGEN+EX_R14(r13);
380 #define PROLOG_ADDITION_2REGS_CRIT(n) \
381 std r14,PACA_EXCRIT+EX_R14(r13); \
382 std r15,PACA_EXCRIT+EX_R15(r13)
384 #define PROLOG_ADDITION_2REGS_DBG(n) \
385 std r14,PACA_EXDBG+EX_R14(r13); \
386 std r15,PACA_EXDBG+EX_R15(r13)
388 #define PROLOG_ADDITION_2REGS_MC(n) \
389 std r14,PACA_EXMC+EX_R14(r13); \
390 std r15,PACA_EXMC+EX_R15(r13)
393 /* Core exception code for all exceptions except TLB misses. */
394 #define EXCEPTION_COMMON_LVL(n, scratch, excf) \
396 std r0,GPR0(r1); /* save r0 in stackframe */ \
397 std r2,GPR2(r1); /* save r2 in stackframe */ \
398 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
399 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
400 std r9,GPR9(r1); /* save r9 in stackframe */ \
401 std r10,_NIP(r1); /* save SRR0 to stackframe */ \
402 std r11,_MSR(r1); /* save SRR1 to stackframe */ \
403 beq 2f; /* if from kernel mode */ \
404 ACCOUNT_CPU_USER_ENTRY(r13,r10,r11);/* accounting (uses cr0+eq) */ \
405 2: ld r3,excf+EX_R10(r13); /* get back r10 */ \
406 ld r4,excf+EX_R11(r13); /* get back r11 */ \
407 mfspr r5,scratch; /* get back r13 */ \
408 std r12,GPR12(r1); /* save r12 in stackframe */ \
409 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
410 mflr r6; /* save LR in stackframe */ \
411 mfctr r7; /* save CTR in stackframe */ \
412 mfspr r8,SPRN_XER; /* save XER in stackframe */ \
413 ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \
414 lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \
415 lbz r11,PACAIRQSOFTMASK(r13); /* get current IRQ softe */ \
416 ld r12,exception_marker@toc(r2); \
418 std r3,GPR10(r1); /* save r10 to stackframe */ \
419 std r4,GPR11(r1); /* save r11 to stackframe */ \
420 std r5,GPR13(r1); /* save it to stackframe */ \
424 li r3,(n)+1; /* indicate partial regs in trap */ \
425 std r9,0(r1); /* store stack frame back link */ \
426 std r10,_CCR(r1); /* store orig CR in stackframe */ \
427 std r9,GPR1(r1); /* store stack frame back link */ \
428 std r11,SOFTE(r1); /* and save it to stackframe */ \
429 std r12,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \
430 std r3,_TRAP(r1); /* set trap number */ \
431 std r0,RESULT(r1); /* clear regs->result */
433 #define EXCEPTION_COMMON(n) \
434 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_GEN_SCRATCH, PACA_EXGEN)
435 #define EXCEPTION_COMMON_CRIT(n) \
436 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_CRIT_SCRATCH, PACA_EXCRIT)
437 #define EXCEPTION_COMMON_MC(n) \
438 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_MC_SCRATCH, PACA_EXMC)
439 #define EXCEPTION_COMMON_DBG(n) \
440 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_DBG_SCRATCH, PACA_EXDBG)
443 * This is meant for exceptions that don't immediately hard-enable. We
444 * set a bit in paca->irq_happened to ensure that a subsequent call to
445 * arch_local_irq_restore() will properly hard-enable and avoid the
446 * fast-path, and then reconcile irq state.
448 #define INTS_DISABLE RECONCILE_IRQ_STATE(r3,r4)
451 * This is called by exceptions that don't use INTS_DISABLE (that did not
452 * touch irq indicators in the PACA). This will restore MSR:EE to it's
455 * XXX In the long run, we may want to open-code it in order to separate the
456 * load from the wrtee, thus limiting the latency caused by the dependency
457 * but at this point, I'll favor code clarity until we have a near to final
460 #define INTS_RESTORE_HARD \
464 /* XXX FIXME: Restore r14/r15 when necessary */
465 #define BAD_STACK_TRAMPOLINE(n) \
466 exc_##n##_bad_stack: \
467 li r1,(n); /* get exception number */ \
468 sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \
469 b bad_stack_book3e; /* bad stack error */
471 /* WARNING: If you change the layout of this stub, make sure you check
472 * the debug exception handler which handles single stepping
473 * into exceptions from userspace, and the MM code in
474 * arch/powerpc/mm/tlb_nohash.c which patches the branch here
475 * and would need to be updated if that branch is moved
477 #define EXCEPTION_STUB(loc, label) \
478 . = interrupt_base_book3e + loc; \
479 nop; /* To make debug interrupts happy */ \
480 b exc_##label##_book3e;
490 /* Used by asynchronous interrupt that may happen in the idle loop.
492 * This check if the thread was in the idle loop, and if yes, returns
493 * to the caller rather than the PC. This is to avoid a race if
494 * interrupts happen before the wait instruction.
496 #define CHECK_NAPPING() \
497 ld r11, PACA_THREAD_INFO(r13); \
498 ld r10,TI_LOCAL_FLAGS(r11); \
499 andi. r9,r10,_TLF_NAPPING; \
502 rlwinm r7,r10,0,~_TLF_NAPPING; \
504 std r7,TI_LOCAL_FLAGS(r11); \
508 #define MASKABLE_EXCEPTION(trapnum, intnum, label, hdlr, ack) \
509 START_EXCEPTION(label); \
510 NORMAL_EXCEPTION_PROLOG(trapnum, intnum, PROLOG_ADDITION_MASKABLE)\
511 EXCEPTION_COMMON(trapnum) \
515 addi r3,r1,STACK_FRAME_OVERHEAD; \
517 b ret_from_except_lite;
519 /* This value is used to mark exception frames on the stack. */
522 .tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER
526 * And here we have the exception vectors !
531 .globl interrupt_base_book3e
532 interrupt_base_book3e: /* fake trap */
533 EXCEPTION_STUB(0x000, machine_check)
534 EXCEPTION_STUB(0x020, critical_input) /* 0x0100 */
535 EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */
536 EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */
537 EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */
538 EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */
539 EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */
540 EXCEPTION_STUB(0x0e0, program) /* 0x0700 */
541 EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */
542 EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */
543 EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */
544 EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
545 EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
546 EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
547 EXCEPTION_STUB(0x1c0, data_tlb_miss)
548 EXCEPTION_STUB(0x1e0, instruction_tlb_miss)
549 EXCEPTION_STUB(0x200, altivec_unavailable)
550 EXCEPTION_STUB(0x220, altivec_assist)
551 EXCEPTION_STUB(0x260, perfmon)
552 EXCEPTION_STUB(0x280, doorbell)
553 EXCEPTION_STUB(0x2a0, doorbell_crit)
554 EXCEPTION_STUB(0x2c0, guest_doorbell)
555 EXCEPTION_STUB(0x2e0, guest_doorbell_crit)
556 EXCEPTION_STUB(0x300, hypercall)
557 EXCEPTION_STUB(0x320, ehpriv)
558 EXCEPTION_STUB(0x340, lrat_error)
560 .globl __end_interrupts
563 /* Critical Input Interrupt */
564 START_EXCEPTION(critical_input);
565 CRIT_EXCEPTION_PROLOG(0x100, BOOKE_INTERRUPT_CRITICAL,
566 PROLOG_ADDITION_NONE)
567 EXCEPTION_COMMON_CRIT(0x100)
571 addi r3,r1,STACK_FRAME_OVERHEAD
573 b ret_from_crit_except
575 /* Machine Check Interrupt */
576 START_EXCEPTION(machine_check);
577 MC_EXCEPTION_PROLOG(0x000, BOOKE_INTERRUPT_MACHINE_CHECK,
578 PROLOG_ADDITION_NONE)
579 EXCEPTION_COMMON_MC(0x000)
583 addi r3,r1,STACK_FRAME_OVERHEAD
584 bl machine_check_exception
587 /* Data Storage Interrupt */
588 START_EXCEPTION(data_storage)
589 NORMAL_EXCEPTION_PROLOG(0x300, BOOKE_INTERRUPT_DATA_STORAGE,
590 PROLOG_ADDITION_2REGS)
593 EXCEPTION_COMMON(0x300)
595 b storage_fault_common
597 /* Instruction Storage Interrupt */
598 START_EXCEPTION(instruction_storage);
599 NORMAL_EXCEPTION_PROLOG(0x400, BOOKE_INTERRUPT_INST_STORAGE,
600 PROLOG_ADDITION_2REGS)
603 EXCEPTION_COMMON(0x400)
605 b storage_fault_common
607 /* External Input Interrupt */
608 MASKABLE_EXCEPTION(0x500, BOOKE_INTERRUPT_EXTERNAL,
609 external_input, do_IRQ, ACK_NONE)
612 START_EXCEPTION(alignment);
613 NORMAL_EXCEPTION_PROLOG(0x600, BOOKE_INTERRUPT_ALIGNMENT,
614 PROLOG_ADDITION_2REGS)
617 EXCEPTION_COMMON(0x600)
618 b alignment_more /* no room, go out of line */
620 /* Program Interrupt */
621 START_EXCEPTION(program);
622 NORMAL_EXCEPTION_PROLOG(0x700, BOOKE_INTERRUPT_PROGRAM,
623 PROLOG_ADDITION_1REG)
625 EXCEPTION_COMMON(0x700)
628 addi r3,r1,STACK_FRAME_OVERHEAD
629 ld r14,PACA_EXGEN+EX_R14(r13)
631 bl program_check_exception
634 /* Floating Point Unavailable Interrupt */
635 START_EXCEPTION(fp_unavailable);
636 NORMAL_EXCEPTION_PROLOG(0x800, BOOKE_INTERRUPT_FP_UNAVAIL,
637 PROLOG_ADDITION_NONE)
638 /* we can probably do a shorter exception entry for that one... */
639 EXCEPTION_COMMON(0x800)
644 b fast_exception_return
647 addi r3,r1,STACK_FRAME_OVERHEAD
648 bl kernel_fp_unavailable_exception
651 /* Altivec Unavailable Interrupt */
652 START_EXCEPTION(altivec_unavailable);
653 NORMAL_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_ALTIVEC_UNAVAIL,
654 PROLOG_ADDITION_NONE)
655 /* we can probably do a shorter exception entry for that one... */
656 EXCEPTION_COMMON(0x200)
657 #ifdef CONFIG_ALTIVEC
663 b fast_exception_return
665 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
669 addi r3,r1,STACK_FRAME_OVERHEAD
670 bl altivec_unavailable_exception
674 START_EXCEPTION(altivec_assist);
675 NORMAL_EXCEPTION_PROLOG(0x220,
676 BOOKE_INTERRUPT_ALTIVEC_ASSIST,
677 PROLOG_ADDITION_NONE)
678 EXCEPTION_COMMON(0x220)
681 addi r3,r1,STACK_FRAME_OVERHEAD
682 #ifdef CONFIG_ALTIVEC
684 bl altivec_assist_exception
685 END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
692 /* Decrementer Interrupt */
693 MASKABLE_EXCEPTION(0x900, BOOKE_INTERRUPT_DECREMENTER,
694 decrementer, timer_interrupt, ACK_DEC)
696 /* Fixed Interval Timer Interrupt */
697 MASKABLE_EXCEPTION(0x980, BOOKE_INTERRUPT_FIT,
698 fixed_interval, unknown_exception, ACK_FIT)
700 /* Watchdog Timer Interrupt */
701 START_EXCEPTION(watchdog);
702 CRIT_EXCEPTION_PROLOG(0x9f0, BOOKE_INTERRUPT_WATCHDOG,
703 PROLOG_ADDITION_NONE)
704 EXCEPTION_COMMON_CRIT(0x9f0)
708 addi r3,r1,STACK_FRAME_OVERHEAD
709 #ifdef CONFIG_BOOKE_WDT
714 b ret_from_crit_except
716 /* System Call Interrupt */
717 START_EXCEPTION(system_call)
718 mr r9,r13 /* keep a copy of userland r13 */
719 mfspr r11,SPRN_SRR0 /* get return address */
720 mfspr r12,SPRN_SRR1 /* get previous MSR */
721 mfspr r13,SPRN_SPRG_PACA /* get our PACA */
724 /* Auxiliary Processor Unavailable Interrupt */
725 START_EXCEPTION(ap_unavailable);
726 NORMAL_EXCEPTION_PROLOG(0xf20, BOOKE_INTERRUPT_AP_UNAVAIL,
727 PROLOG_ADDITION_NONE)
728 EXCEPTION_COMMON(0xf20)
731 addi r3,r1,STACK_FRAME_OVERHEAD
735 /* Debug exception as a critical interrupt*/
736 START_EXCEPTION(debug_crit);
737 CRIT_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
738 PROLOG_ADDITION_2REGS)
741 * If there is a single step or branch-taken exception in an
742 * exception entry sequence, it was probably meant to apply to
743 * the code where the exception occurred (since exception entry
744 * doesn't turn off DE automatically). We simulate the effect
745 * of turning off DE on entry to an exception handler by turning
746 * off DE in the CSRR1 value and clearing the debug status.
749 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
750 andis. r15,r14,(DBSR_IC|DBSR_BT)@h
753 #ifdef CONFIG_RELOCATABLE
755 ld r14,interrupt_base_book3e@got(r15)
756 ld r15,__end_interrupts@got(r15)
758 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e)
759 LOAD_REG_IMMEDIATE(r15,__end_interrupts)
766 /* here it looks like we got an inappropriate debug exception. */
767 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */
768 rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */
771 lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */
772 ld r1,PACA_EXCRIT+EX_R1(r13)
773 ld r14,PACA_EXCRIT+EX_R14(r13)
774 ld r15,PACA_EXCRIT+EX_R15(r13)
776 ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */
777 ld r11,PACA_EXCRIT+EX_R11(r13)
778 mfspr r13,SPRN_SPRG_CRIT_SCRATCH
781 /* Normal debug exception */
782 /* XXX We only handle coming from userspace for now since we can't
783 * quite save properly an interrupted kernel state yet
785 1: andi. r14,r11,MSR_PR; /* check for userspace again */
786 beq kernel_dbg_exc; /* if from kernel mode */
788 /* Now we mash up things to make it look like we are coming on a
792 EXCEPTION_COMMON_CRIT(0xd00)
794 addi r3,r1,STACK_FRAME_OVERHEAD
796 ld r14,PACA_EXCRIT+EX_R14(r13)
797 ld r15,PACA_EXCRIT+EX_R15(r13)
805 /* Debug exception as a debug interrupt*/
806 START_EXCEPTION(debug_debug);
807 DBG_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
808 PROLOG_ADDITION_2REGS)
811 * If there is a single step or branch-taken exception in an
812 * exception entry sequence, it was probably meant to apply to
813 * the code where the exception occurred (since exception entry
814 * doesn't turn off DE automatically). We simulate the effect
815 * of turning off DE on entry to an exception handler by turning
816 * off DE in the DSRR1 value and clearing the debug status.
819 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
820 andis. r15,r14,(DBSR_IC|DBSR_BT)@h
823 #ifdef CONFIG_RELOCATABLE
825 ld r14,interrupt_base_book3e@got(r15)
826 ld r15,__end_interrupts@got(r15)
828 LOAD_REG_IMMEDIATE(r14,interrupt_base_book3e)
829 LOAD_REG_IMMEDIATE(r15,__end_interrupts)
836 /* here it looks like we got an inappropriate debug exception. */
837 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */
838 rlwinm r11,r11,0,~MSR_DE /* clear DE in the DSRR1 value */
841 lwz r10,PACA_EXDBG+EX_CR(r13) /* restore registers */
842 ld r1,PACA_EXDBG+EX_R1(r13)
843 ld r14,PACA_EXDBG+EX_R14(r13)
844 ld r15,PACA_EXDBG+EX_R15(r13)
846 ld r10,PACA_EXDBG+EX_R10(r13) /* restore registers */
847 ld r11,PACA_EXDBG+EX_R11(r13)
848 mfspr r13,SPRN_SPRG_DBG_SCRATCH
851 /* Normal debug exception */
852 /* XXX We only handle coming from userspace for now since we can't
853 * quite save properly an interrupted kernel state yet
855 1: andi. r14,r11,MSR_PR; /* check for userspace again */
856 beq kernel_dbg_exc; /* if from kernel mode */
858 /* Now we mash up things to make it look like we are coming on a
862 EXCEPTION_COMMON_DBG(0xd08)
865 addi r3,r1,STACK_FRAME_OVERHEAD
867 ld r14,PACA_EXDBG+EX_R14(r13)
868 ld r15,PACA_EXDBG+EX_R15(r13)
873 START_EXCEPTION(perfmon);
874 NORMAL_EXCEPTION_PROLOG(0x260, BOOKE_INTERRUPT_PERFORMANCE_MONITOR,
875 PROLOG_ADDITION_NONE)
876 EXCEPTION_COMMON(0x260)
879 addi r3,r1,STACK_FRAME_OVERHEAD
880 bl performance_monitor_exception
881 b ret_from_except_lite
883 /* Doorbell interrupt */
884 MASKABLE_EXCEPTION(0x280, BOOKE_INTERRUPT_DOORBELL,
885 doorbell, doorbell_exception, ACK_NONE)
887 /* Doorbell critical Interrupt */
888 START_EXCEPTION(doorbell_crit);
889 CRIT_EXCEPTION_PROLOG(0x2a0, BOOKE_INTERRUPT_DOORBELL_CRITICAL,
890 PROLOG_ADDITION_NONE)
891 EXCEPTION_COMMON_CRIT(0x2a0)
895 addi r3,r1,STACK_FRAME_OVERHEAD
897 b ret_from_crit_except
900 * Guest doorbell interrupt
901 * This general exception use GSRRx save/restore registers
903 START_EXCEPTION(guest_doorbell);
904 GDBELL_EXCEPTION_PROLOG(0x2c0, BOOKE_INTERRUPT_GUEST_DBELL,
905 PROLOG_ADDITION_NONE)
906 EXCEPTION_COMMON(0x2c0)
907 addi r3,r1,STACK_FRAME_OVERHEAD
913 /* Guest Doorbell critical Interrupt */
914 START_EXCEPTION(guest_doorbell_crit);
915 CRIT_EXCEPTION_PROLOG(0x2e0, BOOKE_INTERRUPT_GUEST_DBELL_CRIT,
916 PROLOG_ADDITION_NONE)
917 EXCEPTION_COMMON_CRIT(0x2e0)
921 addi r3,r1,STACK_FRAME_OVERHEAD
923 b ret_from_crit_except
925 /* Hypervisor call */
926 START_EXCEPTION(hypercall);
927 NORMAL_EXCEPTION_PROLOG(0x310, BOOKE_INTERRUPT_HV_SYSCALL,
928 PROLOG_ADDITION_NONE)
929 EXCEPTION_COMMON(0x310)
930 addi r3,r1,STACK_FRAME_OVERHEAD
936 /* Embedded Hypervisor priviledged */
937 START_EXCEPTION(ehpriv);
938 NORMAL_EXCEPTION_PROLOG(0x320, BOOKE_INTERRUPT_HV_PRIV,
939 PROLOG_ADDITION_NONE)
940 EXCEPTION_COMMON(0x320)
941 addi r3,r1,STACK_FRAME_OVERHEAD
947 /* LRAT Error interrupt */
948 START_EXCEPTION(lrat_error);
949 NORMAL_EXCEPTION_PROLOG(0x340, BOOKE_INTERRUPT_LRAT_ERROR,
950 PROLOG_ADDITION_NONE)
951 EXCEPTION_COMMON(0x340)
952 addi r3,r1,STACK_FRAME_OVERHEAD
959 * An interrupt came in while soft-disabled; We mark paca->irq_happened
960 * accordingly and if the interrupt is level sensitive, we hard disable
961 * hard disable (full_mask) corresponds to PACA_IRQ_MUST_HARD_MASK, so
962 * keep these in synch.
965 .macro masked_interrupt_book3e paca_irq full_mask
966 lbz r10,PACAIRQHAPPENED(r13)
968 ori r10,r10,\paca_irq | PACA_IRQ_HARD_DIS
970 ori r10,r10,\paca_irq
972 stb r10,PACAIRQHAPPENED(r13)
975 rldicl r10,r11,48,1 /* clear MSR_EE */
980 lwz r11,PACA_EXGEN+EX_CR(r13)
982 ld r10,PACA_EXGEN+EX_R10(r13)
983 ld r11,PACA_EXGEN+EX_R11(r13)
984 mfspr r13,SPRN_SPRG_GEN_SCRATCH
989 masked_interrupt_book3e_0x500:
990 // XXX When adding support for EPR, use PACA_IRQ_EE_EDGE
991 masked_interrupt_book3e PACA_IRQ_EE 1
993 masked_interrupt_book3e_0x900:
995 masked_interrupt_book3e PACA_IRQ_DEC 0
997 masked_interrupt_book3e_0x980:
999 masked_interrupt_book3e PACA_IRQ_DEC 0
1001 masked_interrupt_book3e_0x280:
1002 masked_interrupt_book3e_0x2c0:
1003 masked_interrupt_book3e PACA_IRQ_DBELL 0
1006 * Called from arch_local_irq_enable when an interrupt needs
1007 * to be resent. r3 contains either 0x500,0x900,0x260 or 0x280
1008 * to indicate the kind of interrupt. MSR:EE is already off.
1009 * We generate a stackframe like if a real interrupt had happened.
1011 * Note: While MSR:EE is off, we need to make sure that _MSR
1012 * in the generated frame has EE set to 1 or the exception
1013 * handler will not properly re-enable them.
1015 _GLOBAL(__replay_interrupt)
1016 /* We are going to jump to the exception common code which
1017 * will retrieve various register values from the PACA which
1018 * we don't give a damn about.
1023 mtspr SPRN_SPRG_GEN_SCRATCH,r13;
1024 std r1,PACA_EXGEN+EX_R1(r13);
1025 stw r4,PACA_EXGEN+EX_CR(r13);
1027 subi r1,r1,INT_FRAME_SIZE;
1029 beq exc_0x500_common
1031 beq exc_0x900_common
1033 beq exc_0x280_common
1038 * This is called from 0x300 and 0x400 handlers after the prologs with
1039 * r14 and r15 containing the fault address and error code, with the
1040 * original values stashed away in the PACA
1042 storage_fault_common:
1045 addi r3,r1,STACK_FRAME_OVERHEAD
1048 ld r14,PACA_EXGEN+EX_R14(r13)
1049 ld r15,PACA_EXGEN+EX_R15(r13)
1053 b ret_from_except_lite
1056 addi r3,r1,STACK_FRAME_OVERHEAD
1062 * Alignment exception doesn't fit entirely in the 0x100 bytes so it
1068 addi r3,r1,STACK_FRAME_OVERHEAD
1069 ld r14,PACA_EXGEN+EX_R14(r13)
1070 ld r15,PACA_EXGEN+EX_R15(r13)
1073 bl alignment_exception
1077 * We branch here from entry_64.S for the last stage of the exception
1078 * return code path. MSR:EE is expected to be off at that point
1080 _GLOBAL(exception_return_book3e)
1083 /* This is the return from load_up_fpu fast path which could do with
1084 * less GPR restores in fact, but for now we have a single return path
1086 .globl fast_exception_return
1087 fast_exception_return:
1095 ACCOUNT_CPU_USER_EXIT(r13, r10, r11)
1098 1: stdcx. r0,0,r1 /* to clear the reservation */
1112 mtspr SPRN_SPRG_GEN_SCRATCH,r0
1114 std r10,PACA_EXGEN+EX_R10(r13);
1115 std r11,PACA_EXGEN+EX_R11(r13);
1122 ld r10,PACA_EXGEN+EX_R10(r13)
1123 ld r11,PACA_EXGEN+EX_R11(r13)
1124 mfspr r13,SPRN_SPRG_GEN_SCRATCH
1128 * Trampolines used when spotting a bad kernel stack pointer in
1129 * the exception entry code.
1131 * TODO: move some bits like SRR0 read to trampoline, pass PACA
1132 * index around, etc... to handle crit & mcheck
1134 BAD_STACK_TRAMPOLINE(0x000)
1135 BAD_STACK_TRAMPOLINE(0x100)
1136 BAD_STACK_TRAMPOLINE(0x200)
1137 BAD_STACK_TRAMPOLINE(0x220)
1138 BAD_STACK_TRAMPOLINE(0x260)
1139 BAD_STACK_TRAMPOLINE(0x280)
1140 BAD_STACK_TRAMPOLINE(0x2a0)
1141 BAD_STACK_TRAMPOLINE(0x2c0)
1142 BAD_STACK_TRAMPOLINE(0x2e0)
1143 BAD_STACK_TRAMPOLINE(0x300)
1144 BAD_STACK_TRAMPOLINE(0x310)
1145 BAD_STACK_TRAMPOLINE(0x320)
1146 BAD_STACK_TRAMPOLINE(0x340)
1147 BAD_STACK_TRAMPOLINE(0x400)
1148 BAD_STACK_TRAMPOLINE(0x500)
1149 BAD_STACK_TRAMPOLINE(0x600)
1150 BAD_STACK_TRAMPOLINE(0x700)
1151 BAD_STACK_TRAMPOLINE(0x800)
1152 BAD_STACK_TRAMPOLINE(0x900)
1153 BAD_STACK_TRAMPOLINE(0x980)
1154 BAD_STACK_TRAMPOLINE(0x9f0)
1155 BAD_STACK_TRAMPOLINE(0xa00)
1156 BAD_STACK_TRAMPOLINE(0xb00)
1157 BAD_STACK_TRAMPOLINE(0xc00)
1158 BAD_STACK_TRAMPOLINE(0xd00)
1159 BAD_STACK_TRAMPOLINE(0xd08)
1160 BAD_STACK_TRAMPOLINE(0xe00)
1161 BAD_STACK_TRAMPOLINE(0xf00)
1162 BAD_STACK_TRAMPOLINE(0xf20)
1164 .globl bad_stack_book3e
1166 /* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */
1167 mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */
1168 ld r1,PACAEMERGSP(r13)
1169 subi r1,r1,64+INT_FRAME_SIZE
1172 ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */
1173 lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */
1180 std r0,GPR0(r1); /* save r0 in stackframe */ \
1181 std r2,GPR2(r1); /* save r2 in stackframe */ \
1182 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
1183 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
1184 std r9,GPR9(r1); /* save r9 in stackframe */ \
1185 ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \
1186 ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \
1187 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \
1188 std r3,GPR10(r1); /* save r10 to stackframe */ \
1189 std r4,GPR11(r1); /* save r11 to stackframe */ \
1190 std r12,GPR12(r1); /* save r12 in stackframe */ \
1191 std r5,GPR13(r1); /* save it to stackframe */ \
1200 lhz r12,PACA_TRAP_SAVE(r13)
1202 addi r11,r1,INT_FRAME_SIZE
1207 1: addi r3,r1,STACK_FRAME_OVERHEAD
1212 * Setup the initial TLB for a core. This current implementation
1213 * assume that whatever we are running off will not conflict with
1214 * the new mapping at PAGE_OFFSET.
1216 _GLOBAL(initial_tlb_book3e)
1218 /* Look for the first TLB with IPROT set */
1219 mfspr r4,SPRN_TLB0CFG
1220 andi. r3,r4,TLBnCFG_IPROT
1221 lis r3,MAS0_TLBSEL(0)@h
1224 mfspr r4,SPRN_TLB1CFG
1225 andi. r3,r4,TLBnCFG_IPROT
1226 lis r3,MAS0_TLBSEL(1)@h
1229 mfspr r4,SPRN_TLB2CFG
1230 andi. r3,r4,TLBnCFG_IPROT
1231 lis r3,MAS0_TLBSEL(2)@h
1234 lis r3,MAS0_TLBSEL(3)@h
1235 mfspr r4,SPRN_TLB3CFG
1239 andi. r5,r4,TLBnCFG_HES
1242 mflr r8 /* save LR */
1243 /* 1. Find the index of the entry we're executing in
1245 * r3 = MAS0_TLBSEL (for the iprot array)
1248 bl invstr /* Find our address */
1249 invstr: mflr r6 /* Make it accessible */
1251 rlwinm r5,r7,27,31,31 /* extract MSR[IS] */
1256 tlbsx 0,r6 /* search MSR[IS], SPID=PID */
1259 rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */
1261 mfspr r7,SPRN_MAS1 /* Insure IPROT set */
1262 oris r7,r7,MAS1_IPROT@h
1266 /* 2. Invalidate all entries except the entry we're executing in
1268 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
1270 * r5 = ESEL of entry we are running in
1272 andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */
1273 li r6,0 /* Set Entry counter to 0 */
1274 1: mr r7,r3 /* Set MAS0(TLBSEL) */
1275 rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
1279 rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
1281 beq skpinv /* Dont update the current execution TLB */
1285 skpinv: addi r6,r6,1 /* Increment */
1286 cmpw r6,r4 /* Are we done? */
1287 bne 1b /* If not, repeat */
1289 /* Invalidate all TLBs */
1290 PPC_TLBILX_ALL(0,R0)
1294 /* 3. Setup a temp mapping and jump to it
1296 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
1297 * r5 = ESEL of entry we are running in
1299 andi. r7,r5,0x1 /* Find an entry not used and is non-zero */
1301 mr r4,r3 /* Set MAS0(TLBSEL) = 1 */
1305 rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */
1309 xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */
1317 bl 1f /* Find our address */
1319 addi r6,r6,(2f - 1b)
1324 /* 4. Clear out PIDs & Search info
1326 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
1327 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1334 /* 5. Invalidate mapping we started in
1336 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
1337 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1343 rlwinm r6,r6,0,2,31 /* clear IPROT and VALID */
1350 * The mapping only needs to be cache-coherent on SMP, except on
1351 * Freescale e500mc derivatives where it's also needed for coherent DMA.
1353 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC)
1354 #define M_IF_NEEDED MAS2_M
1356 #define M_IF_NEEDED 0
1359 /* 6. Setup KERNELBASE mapping in TLB[0]
1361 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
1362 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1365 rlwinm r3,r3,0,16,3 /* clear ESEL */
1367 lis r6,(MAS1_VALID|MAS1_IPROT)@h
1368 ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l
1371 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | M_IF_NEEDED)
1375 ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX
1382 /* 7. Jump to KERNELBASE mapping
1384 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1386 /* Now we branch the new virtual address mapped by this entry */
1387 bl 1f /* Find our address */
1389 addi r6,r6,(2f - 1b)
1392 ori r7,r7,MSR_KERNEL@l
1395 rfi /* start execution out of TLB1[0] entry */
1398 /* 8. Clear out the temp mapping
1400 * r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in
1405 rlwinm r5,r5,0,2,31 /* clear IPROT and VALID */
1411 /* We translate LR and return */
1417 /* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the
1418 * kernel linear mapping. We also set MAS8 once for all here though
1419 * that will have to be made dependent on whether we are running under
1420 * a hypervisor I suppose.
1424 * This code is called as an ordinary function on the boot CPU. But to
1425 * avoid duplication, this code is also used in SCOM bringup of
1426 * secondary CPUs. We read the code between the initial_tlb_code_start
1427 * and initial_tlb_code_end labels one instruction at a time and RAM it
1428 * into the new core via SCOM. That doesn't process branches, so there
1429 * must be none between those two labels. It also means if this code
1430 * ever takes any parameters, the SCOM code must also be updated to
1433 .globl a2_tlbinit_code_start
1434 a2_tlbinit_code_start:
1436 ori r11,r3,MAS0_WQ_ALLWAYS
1437 oris r11,r11,MAS0_ESEL(3)@h /* Use way 3: workaround A2 erratum 376 */
1439 lis r3,(MAS1_VALID | MAS1_IPROT)@h
1440 ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT
1442 LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M)
1444 li r3,MAS3_SR | MAS3_SW | MAS3_SX
1445 mtspr SPRN_MAS7_MAS3,r3
1449 /* Write the TLB entry */
1452 .globl a2_tlbinit_after_linear_map
1453 a2_tlbinit_after_linear_map:
1455 /* Now we branch the new virtual address mapped by this entry */
1456 LOAD_REG_IMMEDIATE(r3,1f)
1460 1: /* We are now running at PAGE_OFFSET, clean the TLB of everything
1461 * else (including IPROTed things left by firmware)
1463 * r3 = current address (more or less)
1470 rlwinm r9,r4,0,TLBnCFG_N_ENTRY
1471 rlwinm r10,r4,8,0xff
1472 addi r10,r10,-1 /* Get inner loop mask */
1477 rlwinm r5,r5,0,(~(MAS1_VALID|MAS1_IPROT))
1480 rldicr r6,r6,0,51 /* Extract EPN */
1483 rlwinm r7,r7,0,0xffff0fff /* Clear HES and WQ */
1485 rlwinm r8,r7,16,0xfff /* Extract ESEL */
1490 rlwimi r7,r4,16,MAS0_ESEL_MASK
1501 addis r6,r6,(1<<30)@h
1506 .globl a2_tlbinit_after_iprot_flush
1507 a2_tlbinit_after_iprot_flush:
1513 .globl a2_tlbinit_code_end
1514 a2_tlbinit_code_end:
1516 /* We translate LR and return */
1523 * Main entry (boot CPU, thread 0)
1525 * We enter here from head_64.S, possibly after the prom_init trampoline
1526 * with r3 and r4 already saved to r31 and 30 respectively and in 64 bits
1527 * mode. Anything else is as it was left by the bootloader
1529 * Initial requirements of this port:
1531 * - Kernel loaded at 0 physical
1532 * - A good lump of memory mapped 0:0 by UTLB entry 0
1533 * - MSR:IS & MSR:DS set to 0
1535 * Note that some of the above requirements will be relaxed in the future
1536 * as the kernel becomes smarter at dealing with different initial conditions
1537 * but for now you have to be careful
1539 _GLOBAL(start_initialization_book3e)
1542 /* First, we need to setup some initial TLBs to map the kernel
1543 * text, data and bss at PAGE_OFFSET. We don't have a real mode
1544 * and always use AS 0, so we just set it up to match our link
1545 * address and never use 0 based addresses.
1547 bl initial_tlb_book3e
1549 /* Init global core bits */
1552 /* Init per-thread bits */
1553 bl init_thread_book3e
1555 /* Return to common init code */
1562 * Secondary core/processor entry
1564 * This is entered for thread 0 of a secondary core, all other threads
1565 * are expected to be stopped. It's similar to start_initialization_book3e
1566 * except that it's generally entered from the holding loop in head_64.S
1567 * after CPUs have been gathered by Open Firmware.
1569 * We assume we are in 32 bits mode running with whatever TLB entry was
1570 * set for us by the firmware or POR engine.
1572 _GLOBAL(book3e_secondary_core_init_tlb_set)
1574 b generic_secondary_smp_init
1576 _GLOBAL(book3e_secondary_core_init)
1579 /* Do we need to setup initial TLB entry ? */
1583 /* Setup TLB for this core */
1584 bl initial_tlb_book3e
1586 /* We can return from the above running at a different
1587 * address, so recalculate r2 (TOC)
1591 /* Init global core bits */
1592 2: bl init_core_book3e
1594 /* Init per-thread bits */
1595 3: bl init_thread_book3e
1597 /* Return to common init code at proper virtual address.
1599 * Due to various previous assumptions, we know we entered this
1600 * function at either the final PAGE_OFFSET mapping or using a
1601 * 1:1 mapping at 0, so we don't bother doing a complicated check
1602 * here, we just ensure the return address has the right top bits.
1604 * Note that if we ever want to be smarter about where we can be
1605 * started from, we have to be careful that by the time we reach
1606 * the code below we may already be running at a different location
1607 * than the one we were called from since initial_tlb_book3e can
1608 * have moved us already.
1612 lis r3,PAGE_OFFSET@highest
1618 _GLOBAL(book3e_secondary_thread_init)
1622 .globl init_core_book3e
1624 /* Establish the interrupt vector base */
1626 LOAD_REG_ADDR(r3, interrupt_base_book3e)
1632 lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h
1635 /* Make sure interrupts are off */
1638 /* disable all timers and clear out status */
1646 _GLOBAL(__setup_base_ivors)
1647 SET_IVOR(0, 0x020) /* Critical Input */
1648 SET_IVOR(1, 0x000) /* Machine Check */
1649 SET_IVOR(2, 0x060) /* Data Storage */
1650 SET_IVOR(3, 0x080) /* Instruction Storage */
1651 SET_IVOR(4, 0x0a0) /* External Input */
1652 SET_IVOR(5, 0x0c0) /* Alignment */
1653 SET_IVOR(6, 0x0e0) /* Program */
1654 SET_IVOR(7, 0x100) /* FP Unavailable */
1655 SET_IVOR(8, 0x120) /* System Call */
1656 SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */
1657 SET_IVOR(10, 0x160) /* Decrementer */
1658 SET_IVOR(11, 0x180) /* Fixed Interval Timer */
1659 SET_IVOR(12, 0x1a0) /* Watchdog Timer */
1660 SET_IVOR(13, 0x1c0) /* Data TLB Error */
1661 SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
1662 SET_IVOR(15, 0x040) /* Debug */
1668 _GLOBAL(setup_altivec_ivors)
1669 SET_IVOR(32, 0x200) /* AltiVec Unavailable */
1670 SET_IVOR(33, 0x220) /* AltiVec Assist */
1673 _GLOBAL(setup_perfmon_ivor)
1674 SET_IVOR(35, 0x260) /* Performance Monitor */
1677 _GLOBAL(setup_doorbell_ivors)
1678 SET_IVOR(36, 0x280) /* Processor Doorbell */
1679 SET_IVOR(37, 0x2a0) /* Processor Doorbell Crit */
1682 _GLOBAL(setup_ehv_ivors)
1683 SET_IVOR(40, 0x300) /* Embedded Hypervisor System Call */
1684 SET_IVOR(41, 0x320) /* Embedded Hypervisor Privilege */
1685 SET_IVOR(38, 0x2c0) /* Guest Processor Doorbell */
1686 SET_IVOR(39, 0x2e0) /* Guest Processor Doorbell Crit/MC */
1689 _GLOBAL(setup_lrat_ivor)
1690 SET_IVOR(42, 0x340) /* LRAT Error */