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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Boot code and exception vectors for Book3E processors
4 *
5 * Copyright (C) 2007 Ben. Herrenschmidt (benh@kernel.crashing.org), IBM Corp.
6 */
7
8#include <linux/linkage.h>
9#include <linux/threads.h>
10#include <asm/reg.h>
11#include <asm/page.h>
12#include <asm/ppc_asm.h>
13#include <asm/asm-offsets.h>
14#include <asm/cputable.h>
15#include <asm/setup.h>
16#include <asm/thread_info.h>
17#include <asm/exception-64e.h>
18#include <asm/bug.h>
19#include <asm/irqflags.h>
20#include <asm/ptrace.h>
21#include <asm/ppc-opcode.h>
22#include <asm/mmu.h>
23#include <asm/hw_irq.h>
24#include <asm/kvm_asm.h>
25#include <asm/kvm_booke_hv_asm.h>
26#include <asm/feature-fixups.h>
27#include <asm/context_tracking.h>
28
29/* 64e interrupt returns always use SRR registers */
30#define fast_interrupt_return fast_interrupt_return_srr
31#define interrupt_return interrupt_return_srr
32
33/* XXX This will ultimately add space for a special exception save
34 * structure used to save things like SRR0/SRR1, SPRGs, MAS, etc...
35 * when taking special interrupts. For now we don't support that,
36 * special interrupts from within a non-standard level will probably
37 * blow you up
38 */
39#define SPECIAL_EXC_SRR0 0
40#define SPECIAL_EXC_SRR1 1
41#define SPECIAL_EXC_SPRG_GEN 2
42#define SPECIAL_EXC_SPRG_TLB 3
43#define SPECIAL_EXC_MAS0 4
44#define SPECIAL_EXC_MAS1 5
45#define SPECIAL_EXC_MAS2 6
46#define SPECIAL_EXC_MAS3 7
47#define SPECIAL_EXC_MAS6 8
48#define SPECIAL_EXC_MAS7 9
49#define SPECIAL_EXC_MAS5 10 /* E.HV only */
50#define SPECIAL_EXC_MAS8 11 /* E.HV only */
51#define SPECIAL_EXC_IRQHAPPENED 12
52#define SPECIAL_EXC_DEAR 13
53#define SPECIAL_EXC_ESR 14
54#define SPECIAL_EXC_SOFTE 15
55#define SPECIAL_EXC_CSRR0 16
56#define SPECIAL_EXC_CSRR1 17
57/* must be even to keep 16-byte stack alignment */
58#define SPECIAL_EXC_END 18
59
60#define SPECIAL_EXC_FRAME_SIZE (INT_FRAME_SIZE + SPECIAL_EXC_END * 8)
61#define SPECIAL_EXC_FRAME_OFFS (INT_FRAME_SIZE - 288)
62
63#define SPECIAL_EXC_STORE(reg, name) \
64 std reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1)
65
66#define SPECIAL_EXC_LOAD(reg, name) \
67 ld reg, (SPECIAL_EXC_##name * 8 + SPECIAL_EXC_FRAME_OFFS)(r1)
68
69SYM_CODE_START_LOCAL(special_reg_save)
70 /*
71 * We only need (or have stack space) to save this stuff if
72 * we interrupted the kernel.
73 */
74 ld r3,_MSR(r1)
75 andi. r3,r3,MSR_PR
76 bnelr
77
78 /*
79 * Advance to the next TLB exception frame for handler
80 * types that don't do it automatically.
81 */
82 LOAD_REG_ADDR(r11,extlb_level_exc)
83 lwz r12,0(r11)
84 mfspr r10,SPRN_SPRG_TLB_EXFRAME
85 add r10,r10,r12
86 mtspr SPRN_SPRG_TLB_EXFRAME,r10
87
88 /*
89 * Save registers needed to allow nesting of certain exceptions
90 * (such as TLB misses) inside special exception levels
91 */
92 mfspr r10,SPRN_SRR0
93 SPECIAL_EXC_STORE(r10,SRR0)
94 mfspr r10,SPRN_SRR1
95 SPECIAL_EXC_STORE(r10,SRR1)
96 mfspr r10,SPRN_SPRG_GEN_SCRATCH
97 SPECIAL_EXC_STORE(r10,SPRG_GEN)
98 mfspr r10,SPRN_SPRG_TLB_SCRATCH
99 SPECIAL_EXC_STORE(r10,SPRG_TLB)
100 mfspr r10,SPRN_MAS0
101 SPECIAL_EXC_STORE(r10,MAS0)
102 mfspr r10,SPRN_MAS1
103 SPECIAL_EXC_STORE(r10,MAS1)
104 mfspr r10,SPRN_MAS2
105 SPECIAL_EXC_STORE(r10,MAS2)
106 mfspr r10,SPRN_MAS3
107 SPECIAL_EXC_STORE(r10,MAS3)
108 mfspr r10,SPRN_MAS6
109 SPECIAL_EXC_STORE(r10,MAS6)
110 mfspr r10,SPRN_MAS7
111 SPECIAL_EXC_STORE(r10,MAS7)
112BEGIN_FTR_SECTION
113 mfspr r10,SPRN_MAS5
114 SPECIAL_EXC_STORE(r10,MAS5)
115 mfspr r10,SPRN_MAS8
116 SPECIAL_EXC_STORE(r10,MAS8)
117
118 /* MAS5/8 could have inappropriate values if we interrupted KVM code */
119 li r10,0
120 mtspr SPRN_MAS5,r10
121 mtspr SPRN_MAS8,r10
122END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
123 mfspr r10,SPRN_DEAR
124 SPECIAL_EXC_STORE(r10,DEAR)
125 mfspr r10,SPRN_ESR
126 SPECIAL_EXC_STORE(r10,ESR)
127
128 ld r10,_NIP(r1)
129 SPECIAL_EXC_STORE(r10,CSRR0)
130 ld r10,_MSR(r1)
131 SPECIAL_EXC_STORE(r10,CSRR1)
132
133 blr
134SYM_CODE_END(special_reg_save)
135
136SYM_CODE_START_LOCAL(ret_from_level_except)
137 ld r3,_MSR(r1)
138 andi. r3,r3,MSR_PR
139 beq 1f
140 REST_NVGPRS(r1)
141 b interrupt_return
1421:
143
144 LOAD_REG_ADDR(r11,extlb_level_exc)
145 lwz r12,0(r11)
146 mfspr r10,SPRN_SPRG_TLB_EXFRAME
147 sub r10,r10,r12
148 mtspr SPRN_SPRG_TLB_EXFRAME,r10
149
150 /*
151 * It's possible that the special level exception interrupted a
152 * TLB miss handler, and inserted the same entry that the
153 * interrupted handler was about to insert. On CPUs without TLB
154 * write conditional, this can result in a duplicate TLB entry.
155 * Wipe all non-bolted entries to be safe.
156 *
157 * Note that this doesn't protect against any TLB misses
158 * we may take accessing the stack from here to the end of
159 * the special level exception. It's not clear how we can
160 * reasonably protect against that, but only CPUs with
161 * neither TLB write conditional nor bolted kernel memory
162 * are affected. Do any such CPUs even exist?
163 */
164 PPC_TLBILX_ALL(0,R0)
165
166 REST_NVGPRS(r1)
167
168 SPECIAL_EXC_LOAD(r10,SRR0)
169 mtspr SPRN_SRR0,r10
170 SPECIAL_EXC_LOAD(r10,SRR1)
171 mtspr SPRN_SRR1,r10
172 SPECIAL_EXC_LOAD(r10,SPRG_GEN)
173 mtspr SPRN_SPRG_GEN_SCRATCH,r10
174 SPECIAL_EXC_LOAD(r10,SPRG_TLB)
175 mtspr SPRN_SPRG_TLB_SCRATCH,r10
176 SPECIAL_EXC_LOAD(r10,MAS0)
177 mtspr SPRN_MAS0,r10
178 SPECIAL_EXC_LOAD(r10,MAS1)
179 mtspr SPRN_MAS1,r10
180 SPECIAL_EXC_LOAD(r10,MAS2)
181 mtspr SPRN_MAS2,r10
182 SPECIAL_EXC_LOAD(r10,MAS3)
183 mtspr SPRN_MAS3,r10
184 SPECIAL_EXC_LOAD(r10,MAS6)
185 mtspr SPRN_MAS6,r10
186 SPECIAL_EXC_LOAD(r10,MAS7)
187 mtspr SPRN_MAS7,r10
188BEGIN_FTR_SECTION
189 SPECIAL_EXC_LOAD(r10,MAS5)
190 mtspr SPRN_MAS5,r10
191 SPECIAL_EXC_LOAD(r10,MAS8)
192 mtspr SPRN_MAS8,r10
193END_FTR_SECTION_IFSET(CPU_FTR_EMB_HV)
194
195 SPECIAL_EXC_LOAD(r10,DEAR)
196 mtspr SPRN_DEAR,r10
197 SPECIAL_EXC_LOAD(r10,ESR)
198 mtspr SPRN_ESR,r10
199
200 stdcx. r0,0,r1 /* to clear the reservation */
201
202 REST_GPRS(2, 9, r1)
203
204 ld r10,_CTR(r1)
205 ld r11,_XER(r1)
206 mtctr r10
207 mtxer r11
208
209 blr
210SYM_CODE_END(ret_from_level_except)
211
212.macro ret_from_level srr0 srr1 paca_ex scratch
213 bl ret_from_level_except
214
215 ld r10,_LINK(r1)
216 ld r11,_CCR(r1)
217 ld r0,GPR13(r1)
218 mtlr r10
219 mtcr r11
220
221 REST_GPRS(10, 12, r1)
222 mtspr \scratch,r0
223
224 std r10,\paca_ex+EX_R10(r13);
225 std r11,\paca_ex+EX_R11(r13);
226 ld r10,_NIP(r1)
227 ld r11,_MSR(r1)
228 REST_GPR(0, r1)
229 REST_GPR(1, r1)
230 mtspr \srr0,r10
231 mtspr \srr1,r11
232 ld r10,\paca_ex+EX_R10(r13)
233 ld r11,\paca_ex+EX_R11(r13)
234 mfspr r13,\scratch
235.endm
236
237SYM_CODE_START_LOCAL(ret_from_crit_except)
238 ret_from_level SPRN_CSRR0 SPRN_CSRR1 PACA_EXCRIT SPRN_SPRG_CRIT_SCRATCH
239 rfci
240SYM_CODE_END(ret_from_crit_except)
241
242SYM_CODE_START_LOCAL(ret_from_mc_except)
243 ret_from_level SPRN_MCSRR0 SPRN_MCSRR1 PACA_EXMC SPRN_SPRG_MC_SCRATCH
244 rfmci
245SYM_CODE_END(ret_from_mc_except)
246
247/* Exception prolog code for all exceptions */
248#define EXCEPTION_PROLOG(n, intnum, type, addition) \
249 mtspr SPRN_SPRG_##type##_SCRATCH,r13; /* get spare registers */ \
250 mfspr r13,SPRN_SPRG_PACA; /* get PACA */ \
251 std r10,PACA_EX##type+EX_R10(r13); \
252 std r11,PACA_EX##type+EX_R11(r13); \
253 mfcr r10; /* save CR */ \
254 mfspr r11,SPRN_##type##_SRR1;/* what are we coming from */ \
255 DO_KVM intnum,SPRN_##type##_SRR1; /* KVM hook */ \
256 stw r10,PACA_EX##type+EX_CR(r13); /* save old CR in the PACA */ \
257 addition; /* additional code for that exc. */ \
258 std r1,PACA_EX##type+EX_R1(r13); /* save old r1 in the PACA */ \
259 type##_SET_KSTACK; /* get special stack if necessary */\
260 andi. r10,r11,MSR_PR; /* save stack pointer */ \
261 beq 1f; /* branch around if supervisor */ \
262 ld r1,PACAKSAVE(r13); /* get kernel stack coming from usr */\
2631: type##_BTB_FLUSH \
264 cmpdi cr1,r1,0; /* check if SP makes sense */ \
265 bge- cr1,exc_##n##_bad_stack;/* bad stack (TODO: out of line) */ \
266 mfspr r10,SPRN_##type##_SRR0; /* read SRR0 before touching stack */
267
268/* Exception type-specific macros */
269#define GEN_SET_KSTACK \
270 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */
271#define SPRN_GEN_SRR0 SPRN_SRR0
272#define SPRN_GEN_SRR1 SPRN_SRR1
273
274#define GDBELL_SET_KSTACK GEN_SET_KSTACK
275#define SPRN_GDBELL_SRR0 SPRN_GSRR0
276#define SPRN_GDBELL_SRR1 SPRN_GSRR1
277
278#define CRIT_SET_KSTACK \
279 ld r1,PACA_CRIT_STACK(r13); \
280 subi r1,r1,SPECIAL_EXC_FRAME_SIZE
281#define SPRN_CRIT_SRR0 SPRN_CSRR0
282#define SPRN_CRIT_SRR1 SPRN_CSRR1
283
284#define DBG_SET_KSTACK \
285 ld r1,PACA_DBG_STACK(r13); \
286 subi r1,r1,SPECIAL_EXC_FRAME_SIZE
287#define SPRN_DBG_SRR0 SPRN_DSRR0
288#define SPRN_DBG_SRR1 SPRN_DSRR1
289
290#define MC_SET_KSTACK \
291 ld r1,PACA_MC_STACK(r13); \
292 subi r1,r1,SPECIAL_EXC_FRAME_SIZE
293#define SPRN_MC_SRR0 SPRN_MCSRR0
294#define SPRN_MC_SRR1 SPRN_MCSRR1
295
296#define GEN_BTB_FLUSH \
297 START_BTB_FLUSH_SECTION \
298 beq 1f; \
299 BTB_FLUSH(r10) \
300 1: \
301 END_BTB_FLUSH_SECTION
302
303#define CRIT_BTB_FLUSH \
304 START_BTB_FLUSH_SECTION \
305 BTB_FLUSH(r10) \
306 END_BTB_FLUSH_SECTION
307
308#define DBG_BTB_FLUSH CRIT_BTB_FLUSH
309#define MC_BTB_FLUSH CRIT_BTB_FLUSH
310#define GDBELL_BTB_FLUSH GEN_BTB_FLUSH
311
312#define NORMAL_EXCEPTION_PROLOG(n, intnum, addition) \
313 EXCEPTION_PROLOG(n, intnum, GEN, addition##_GEN(n))
314
315#define CRIT_EXCEPTION_PROLOG(n, intnum, addition) \
316 EXCEPTION_PROLOG(n, intnum, CRIT, addition##_CRIT(n))
317
318#define DBG_EXCEPTION_PROLOG(n, intnum, addition) \
319 EXCEPTION_PROLOG(n, intnum, DBG, addition##_DBG(n))
320
321#define MC_EXCEPTION_PROLOG(n, intnum, addition) \
322 EXCEPTION_PROLOG(n, intnum, MC, addition##_MC(n))
323
324#define GDBELL_EXCEPTION_PROLOG(n, intnum, addition) \
325 EXCEPTION_PROLOG(n, intnum, GDBELL, addition##_GDBELL(n))
326
327/* Variants of the "addition" argument for the prolog
328 */
329#define PROLOG_ADDITION_NONE_GEN(n)
330#define PROLOG_ADDITION_NONE_GDBELL(n)
331#define PROLOG_ADDITION_NONE_CRIT(n)
332#define PROLOG_ADDITION_NONE_DBG(n)
333#define PROLOG_ADDITION_NONE_MC(n)
334
335#define PROLOG_ADDITION_MASKABLE_GEN(n) \
336 lbz r10,PACAIRQSOFTMASK(r13); /* are irqs soft-masked? */ \
337 andi. r10,r10,IRQS_DISABLED; /* yes -> go out of line */ \
338 bne masked_interrupt_book3e_##n
339
340/*
341 * Additional regs must be re-loaded from paca before EXCEPTION_COMMON* is
342 * called, because that does SAVE_NVGPRS which must see the original register
343 * values, otherwise the scratch values might be restored when exiting the
344 * interrupt.
345 */
346#define PROLOG_ADDITION_2REGS_GEN(n) \
347 std r14,PACA_EXGEN+EX_R14(r13); \
348 std r15,PACA_EXGEN+EX_R15(r13)
349
350#define PROLOG_ADDITION_1REG_GEN(n) \
351 std r14,PACA_EXGEN+EX_R14(r13);
352
353#define PROLOG_ADDITION_2REGS_CRIT(n) \
354 std r14,PACA_EXCRIT+EX_R14(r13); \
355 std r15,PACA_EXCRIT+EX_R15(r13)
356
357#define PROLOG_ADDITION_2REGS_DBG(n) \
358 std r14,PACA_EXDBG+EX_R14(r13); \
359 std r15,PACA_EXDBG+EX_R15(r13)
360
361#define PROLOG_ADDITION_2REGS_MC(n) \
362 std r14,PACA_EXMC+EX_R14(r13); \
363 std r15,PACA_EXMC+EX_R15(r13)
364
365/* Core exception code for all exceptions except TLB misses. */
366#define EXCEPTION_COMMON_LVL(n, scratch, excf) \
367exc_##n##_common: \
368 SAVE_GPR(0, r1); /* save r0 in stackframe */ \
369 SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \
370 std r10,_NIP(r1); /* save SRR0 to stackframe */ \
371 std r11,_MSR(r1); /* save SRR1 to stackframe */ \
372 beq 2f; /* if from kernel mode */ \
3732: ld r3,excf+EX_R10(r13); /* get back r10 */ \
374 ld r4,excf+EX_R11(r13); /* get back r11 */ \
375 mfspr r5,scratch; /* get back r13 */ \
376 SAVE_GPR(12, r1); /* save r12 in stackframe */ \
377 LOAD_PACA_TOC(); /* get kernel TOC into r2 */ \
378 mflr r6; /* save LR in stackframe */ \
379 mfctr r7; /* save CTR in stackframe */ \
380 mfspr r8,SPRN_XER; /* save XER in stackframe */ \
381 ld r9,excf+EX_R1(r13); /* load orig r1 back from PACA */ \
382 lwz r10,excf+EX_CR(r13); /* load orig CR back from PACA */ \
383 lbz r11,PACAIRQSOFTMASK(r13); /* get current IRQ softe */ \
384 LOAD_REG_IMMEDIATE(r12, STACK_FRAME_REGS_MARKER); \
385 ZEROIZE_GPR(0); \
386 std r3,GPR10(r1); /* save r10 to stackframe */ \
387 std r4,GPR11(r1); /* save r11 to stackframe */ \
388 std r5,GPR13(r1); /* save it to stackframe */ \
389 std r6,_LINK(r1); \
390 std r7,_CTR(r1); \
391 std r8,_XER(r1); \
392 li r3,(n); /* regs.trap vector */ \
393 std r9,0(r1); /* store stack frame back link */ \
394 std r10,_CCR(r1); /* store orig CR in stackframe */ \
395 std r9,GPR1(r1); /* store stack frame back link */ \
396 std r11,SOFTE(r1); /* and save it to stackframe */ \
397 std r12,STACK_INT_FRAME_MARKER(r1); /* mark the frame */ \
398 std r3,_TRAP(r1); /* set trap number */ \
399 std r0,RESULT(r1); /* clear regs->result */ \
400 SAVE_NVGPRS(r1); \
401 SANITIZE_NVGPRS(); /* minimise speculation influence */
402
403#define EXCEPTION_COMMON(n) \
404 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_GEN_SCRATCH, PACA_EXGEN)
405#define EXCEPTION_COMMON_CRIT(n) \
406 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_CRIT_SCRATCH, PACA_EXCRIT)
407#define EXCEPTION_COMMON_MC(n) \
408 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_MC_SCRATCH, PACA_EXMC)
409#define EXCEPTION_COMMON_DBG(n) \
410 EXCEPTION_COMMON_LVL(n, SPRN_SPRG_DBG_SCRATCH, PACA_EXDBG)
411
412/* XXX FIXME: Restore r14/r15 when necessary */
413#define BAD_STACK_TRAMPOLINE(n) \
414exc_##n##_bad_stack: \
415 li r1,(n); /* get exception number */ \
416 sth r1,PACA_TRAP_SAVE(r13); /* store trap */ \
417 b bad_stack_book3e; /* bad stack error */
418
419/* WARNING: If you change the layout of this stub, make sure you check
420 * the debug exception handler which handles single stepping
421 * into exceptions from userspace, and the MM code in
422 * arch/powerpc/mm/tlb_nohash.c which patches the branch here
423 * and would need to be updated if that branch is moved
424 */
425#define EXCEPTION_STUB(loc, label) \
426 . = interrupt_base_book3e + loc; \
427 nop; /* To make debug interrupts happy */ \
428 b exc_##label##_book3e;
429
430#define ACK_NONE(r)
431#define ACK_DEC(r) \
432 lis r,TSR_DIS@h; \
433 mtspr SPRN_TSR,r
434#define ACK_FIT(r) \
435 lis r,TSR_FIS@h; \
436 mtspr SPRN_TSR,r
437
438/* Used by asynchronous interrupt that may happen in the idle loop.
439 *
440 * This check if the thread was in the idle loop, and if yes, returns
441 * to the caller rather than the PC. This is to avoid a race if
442 * interrupts happen before the wait instruction.
443 */
444#define CHECK_NAPPING() \
445 ld r11, PACA_THREAD_INFO(r13); \
446 ld r10,TI_LOCAL_FLAGS(r11); \
447 andi. r9,r10,_TLF_NAPPING; \
448 beq+ 1f; \
449 ld r8,_LINK(r1); \
450 rlwinm r7,r10,0,~_TLF_NAPPING; \
451 std r8,_NIP(r1); \
452 std r7,TI_LOCAL_FLAGS(r11); \
4531:
454
455
456#define MASKABLE_EXCEPTION(trapnum, intnum, label, hdlr, ack) \
457 START_EXCEPTION(label); \
458 NORMAL_EXCEPTION_PROLOG(trapnum, intnum, PROLOG_ADDITION_MASKABLE)\
459 EXCEPTION_COMMON(trapnum) \
460 ack(r8); \
461 CHECK_NAPPING(); \
462 addi r3,r1,STACK_INT_FRAME_REGS; \
463 bl hdlr; \
464 b interrupt_return
465
466/*
467 * And here we have the exception vectors !
468 */
469
470 .text
471 .balign 0x1000
472 .globl interrupt_base_book3e
473interrupt_base_book3e: /* fake trap */
474 EXCEPTION_STUB(0x000, machine_check)
475 EXCEPTION_STUB(0x020, critical_input) /* 0x0100 */
476 EXCEPTION_STUB(0x040, debug_crit) /* 0x0d00 */
477 EXCEPTION_STUB(0x060, data_storage) /* 0x0300 */
478 EXCEPTION_STUB(0x080, instruction_storage) /* 0x0400 */
479 EXCEPTION_STUB(0x0a0, external_input) /* 0x0500 */
480 EXCEPTION_STUB(0x0c0, alignment) /* 0x0600 */
481 EXCEPTION_STUB(0x0e0, program) /* 0x0700 */
482 EXCEPTION_STUB(0x100, fp_unavailable) /* 0x0800 */
483 EXCEPTION_STUB(0x120, system_call) /* 0x0c00 */
484 EXCEPTION_STUB(0x140, ap_unavailable) /* 0x0f20 */
485 EXCEPTION_STUB(0x160, decrementer) /* 0x0900 */
486 EXCEPTION_STUB(0x180, fixed_interval) /* 0x0980 */
487 EXCEPTION_STUB(0x1a0, watchdog) /* 0x09f0 */
488 EXCEPTION_STUB(0x1c0, data_tlb_miss_bolted)
489 EXCEPTION_STUB(0x1e0, instruction_tlb_miss_bolted)
490 EXCEPTION_STUB(0x200, altivec_unavailable)
491 EXCEPTION_STUB(0x220, altivec_assist)
492 EXCEPTION_STUB(0x260, perfmon)
493 EXCEPTION_STUB(0x280, doorbell)
494 EXCEPTION_STUB(0x2a0, doorbell_crit)
495 EXCEPTION_STUB(0x2c0, guest_doorbell)
496 EXCEPTION_STUB(0x2e0, guest_doorbell_crit)
497 EXCEPTION_STUB(0x300, hypercall)
498 EXCEPTION_STUB(0x320, ehpriv)
499 EXCEPTION_STUB(0x340, lrat_error)
500
501 .globl __end_interrupts
502__end_interrupts:
503
504/* Critical Input Interrupt */
505 START_EXCEPTION(critical_input);
506 CRIT_EXCEPTION_PROLOG(0x100, BOOKE_INTERRUPT_CRITICAL,
507 PROLOG_ADDITION_NONE)
508 EXCEPTION_COMMON_CRIT(0x100)
509 bl special_reg_save
510 CHECK_NAPPING();
511 addi r3,r1,STACK_INT_FRAME_REGS
512 bl unknown_nmi_exception
513 b ret_from_crit_except
514
515/* Machine Check Interrupt */
516 START_EXCEPTION(machine_check);
517 MC_EXCEPTION_PROLOG(0x000, BOOKE_INTERRUPT_MACHINE_CHECK,
518 PROLOG_ADDITION_NONE)
519 EXCEPTION_COMMON_MC(0x000)
520 bl special_reg_save
521 CHECK_NAPPING();
522 addi r3,r1,STACK_INT_FRAME_REGS
523 bl machine_check_exception
524 b ret_from_mc_except
525
526/* Data Storage Interrupt */
527 START_EXCEPTION(data_storage)
528 NORMAL_EXCEPTION_PROLOG(0x300, BOOKE_INTERRUPT_DATA_STORAGE,
529 PROLOG_ADDITION_2REGS)
530 mfspr r14,SPRN_DEAR
531 mfspr r15,SPRN_ESR
532 std r14,_DEAR(r1)
533 std r15,_ESR(r1)
534 ld r14,PACA_EXGEN+EX_R14(r13)
535 ld r15,PACA_EXGEN+EX_R15(r13)
536 EXCEPTION_COMMON(0x300)
537 b storage_fault_common
538
539/* Instruction Storage Interrupt */
540 START_EXCEPTION(instruction_storage);
541 NORMAL_EXCEPTION_PROLOG(0x400, BOOKE_INTERRUPT_INST_STORAGE,
542 PROLOG_ADDITION_2REGS)
543 li r15,0
544 mr r14,r10
545 std r14,_DEAR(r1)
546 std r15,_ESR(r1)
547 ld r14,PACA_EXGEN+EX_R14(r13)
548 ld r15,PACA_EXGEN+EX_R15(r13)
549 EXCEPTION_COMMON(0x400)
550 b storage_fault_common
551
552/* External Input Interrupt */
553 MASKABLE_EXCEPTION(0x500, BOOKE_INTERRUPT_EXTERNAL,
554 external_input, do_IRQ, ACK_NONE)
555
556/* Alignment */
557 START_EXCEPTION(alignment);
558 NORMAL_EXCEPTION_PROLOG(0x600, BOOKE_INTERRUPT_ALIGNMENT,
559 PROLOG_ADDITION_2REGS)
560 mfspr r14,SPRN_DEAR
561 mfspr r15,SPRN_ESR
562 std r14,_DEAR(r1)
563 std r15,_ESR(r1)
564 ld r14,PACA_EXGEN+EX_R14(r13)
565 ld r15,PACA_EXGEN+EX_R15(r13)
566 EXCEPTION_COMMON(0x600)
567 b alignment_more /* no room, go out of line */
568
569/* Program Interrupt */
570 START_EXCEPTION(program);
571 NORMAL_EXCEPTION_PROLOG(0x700, BOOKE_INTERRUPT_PROGRAM,
572 PROLOG_ADDITION_1REG)
573 mfspr r14,SPRN_ESR
574 std r14,_ESR(r1)
575 ld r14,PACA_EXGEN+EX_R14(r13)
576 EXCEPTION_COMMON(0x700)
577 addi r3,r1,STACK_INT_FRAME_REGS
578 bl program_check_exception
579 REST_NVGPRS(r1)
580 b interrupt_return
581
582/* Floating Point Unavailable Interrupt */
583 START_EXCEPTION(fp_unavailable);
584 NORMAL_EXCEPTION_PROLOG(0x800, BOOKE_INTERRUPT_FP_UNAVAIL,
585 PROLOG_ADDITION_NONE)
586 /* we can probably do a shorter exception entry for that one... */
587 EXCEPTION_COMMON(0x800)
588 ld r12,_MSR(r1)
589 andi. r0,r12,MSR_PR;
590 beq- 1f
591 bl load_up_fpu
592 b fast_interrupt_return
5931: addi r3,r1,STACK_INT_FRAME_REGS
594 bl kernel_fp_unavailable_exception
595 b interrupt_return
596
597/* Altivec Unavailable Interrupt */
598 START_EXCEPTION(altivec_unavailable);
599 NORMAL_EXCEPTION_PROLOG(0x200, BOOKE_INTERRUPT_ALTIVEC_UNAVAIL,
600 PROLOG_ADDITION_NONE)
601 /* we can probably do a shorter exception entry for that one... */
602 EXCEPTION_COMMON(0x200)
603#ifdef CONFIG_ALTIVEC
604BEGIN_FTR_SECTION
605 ld r12,_MSR(r1)
606 andi. r0,r12,MSR_PR;
607 beq- 1f
608 bl load_up_altivec
609 b fast_interrupt_return
6101:
611END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
612#endif
613 addi r3,r1,STACK_INT_FRAME_REGS
614 bl altivec_unavailable_exception
615 b interrupt_return
616
617/* AltiVec Assist */
618 START_EXCEPTION(altivec_assist);
619 NORMAL_EXCEPTION_PROLOG(0x220,
620 BOOKE_INTERRUPT_ALTIVEC_ASSIST,
621 PROLOG_ADDITION_NONE)
622 EXCEPTION_COMMON(0x220)
623 addi r3,r1,STACK_INT_FRAME_REGS
624#ifdef CONFIG_ALTIVEC
625BEGIN_FTR_SECTION
626 bl altivec_assist_exception
627END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
628 REST_NVGPRS(r1)
629#else
630 bl unknown_exception
631#endif
632 b interrupt_return
633
634
635/* Decrementer Interrupt */
636 MASKABLE_EXCEPTION(0x900, BOOKE_INTERRUPT_DECREMENTER,
637 decrementer, timer_interrupt, ACK_DEC)
638
639/* Fixed Interval Timer Interrupt */
640 MASKABLE_EXCEPTION(0x980, BOOKE_INTERRUPT_FIT,
641 fixed_interval, unknown_exception, ACK_FIT)
642
643/* Watchdog Timer Interrupt */
644 START_EXCEPTION(watchdog);
645 CRIT_EXCEPTION_PROLOG(0x9f0, BOOKE_INTERRUPT_WATCHDOG,
646 PROLOG_ADDITION_NONE)
647 EXCEPTION_COMMON_CRIT(0x9f0)
648 bl special_reg_save
649 CHECK_NAPPING();
650 addi r3,r1,STACK_INT_FRAME_REGS
651#ifdef CONFIG_BOOKE_WDT
652 bl WatchdogException
653#else
654 bl unknown_nmi_exception
655#endif
656 b ret_from_crit_except
657
658/* System Call Interrupt */
659 START_EXCEPTION(system_call)
660 mr r9,r13 /* keep a copy of userland r13 */
661 mfspr r11,SPRN_SRR0 /* get return address */
662 mfspr r12,SPRN_SRR1 /* get previous MSR */
663 mfspr r13,SPRN_SPRG_PACA /* get our PACA */
664 b system_call_common
665
666/* Auxiliary Processor Unavailable Interrupt */
667 START_EXCEPTION(ap_unavailable);
668 NORMAL_EXCEPTION_PROLOG(0xf20, BOOKE_INTERRUPT_AP_UNAVAIL,
669 PROLOG_ADDITION_NONE)
670 EXCEPTION_COMMON(0xf20)
671 addi r3,r1,STACK_INT_FRAME_REGS
672 bl unknown_exception
673 b interrupt_return
674
675/* Debug exception as a critical interrupt*/
676 START_EXCEPTION(debug_crit);
677 CRIT_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
678 PROLOG_ADDITION_2REGS)
679
680 /*
681 * If there is a single step or branch-taken exception in an
682 * exception entry sequence, it was probably meant to apply to
683 * the code where the exception occurred (since exception entry
684 * doesn't turn off DE automatically). We simulate the effect
685 * of turning off DE on entry to an exception handler by turning
686 * off DE in the CSRR1 value and clearing the debug status.
687 */
688
689 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
690 andis. r15,r14,(DBSR_IC|DBSR_BT)@h
691 beq+ 1f
692
693#ifdef CONFIG_RELOCATABLE
694 __LOAD_PACA_TOC(r15)
695 LOAD_REG_ADDR_ALTTOC(r14, r15, interrupt_base_book3e)
696 LOAD_REG_ADDR_ALTTOC(r15, r15, __end_interrupts)
697 cmpld cr0,r10,r14
698 cmpld cr1,r10,r15
699#else
700 LOAD_REG_IMMEDIATE_SYM(r14, r15, interrupt_base_book3e)
701 cmpld cr0, r10, r14
702 LOAD_REG_IMMEDIATE_SYM(r14, r15, __end_interrupts)
703 cmpld cr1, r10, r14
704#endif
705 blt+ cr0,1f
706 bge+ cr1,1f
707
708 /* here it looks like we got an inappropriate debug exception. */
709 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */
710 rlwinm r11,r11,0,~MSR_DE /* clear DE in the CSRR1 value */
711 mtspr SPRN_DBSR,r14
712 mtspr SPRN_CSRR1,r11
713 lwz r10,PACA_EXCRIT+EX_CR(r13) /* restore registers */
714 ld r1,PACA_EXCRIT+EX_R1(r13)
715 ld r14,PACA_EXCRIT+EX_R14(r13)
716 ld r15,PACA_EXCRIT+EX_R15(r13)
717 mtcr r10
718 ld r10,PACA_EXCRIT+EX_R10(r13) /* restore registers */
719 ld r11,PACA_EXCRIT+EX_R11(r13)
720 mfspr r13,SPRN_SPRG_CRIT_SCRATCH
721 rfci
722
723 /* Normal debug exception */
724 /* XXX We only handle coming from userspace for now since we can't
725 * quite save properly an interrupted kernel state yet
726 */
7271: andi. r14,r11,MSR_PR; /* check for userspace again */
728 beq kernel_dbg_exc; /* if from kernel mode */
729
730 /* Now we mash up things to make it look like we are coming on a
731 * normal exception
732 */
733 mfspr r14,SPRN_DBSR
734 std r14,_DSISR(r1)
735 ld r14,PACA_EXCRIT+EX_R14(r13)
736 ld r15,PACA_EXCRIT+EX_R15(r13)
737 EXCEPTION_COMMON_CRIT(0xd00)
738 addi r3,r1,STACK_INT_FRAME_REGS
739 bl DebugException
740 REST_NVGPRS(r1)
741 b interrupt_return
742
743kernel_dbg_exc:
744 b . /* NYI */
745
746/* Debug exception as a debug interrupt*/
747 START_EXCEPTION(debug_debug);
748 DBG_EXCEPTION_PROLOG(0xd00, BOOKE_INTERRUPT_DEBUG,
749 PROLOG_ADDITION_2REGS)
750
751 /*
752 * If there is a single step or branch-taken exception in an
753 * exception entry sequence, it was probably meant to apply to
754 * the code where the exception occurred (since exception entry
755 * doesn't turn off DE automatically). We simulate the effect
756 * of turning off DE on entry to an exception handler by turning
757 * off DE in the DSRR1 value and clearing the debug status.
758 */
759
760 mfspr r14,SPRN_DBSR /* check single-step/branch taken */
761 andis. r15,r14,(DBSR_IC|DBSR_BT)@h
762 beq+ 1f
763
764#ifdef CONFIG_RELOCATABLE
765 __LOAD_PACA_TOC(r15)
766 LOAD_REG_ADDR_ALTTOC(r14, r15, interrupt_base_book3e)
767 LOAD_REG_ADDR_ALTTOC(r15, r15, __end_interrupts)
768 cmpld cr0,r10,r14
769 cmpld cr1,r10,r15
770#else
771 LOAD_REG_IMMEDIATE_SYM(r14, r15, interrupt_base_book3e)
772 cmpld cr0, r10, r14
773 LOAD_REG_IMMEDIATE_SYM(r14, r15,__end_interrupts)
774 cmpld cr1, r10, r14
775#endif
776 blt+ cr0,1f
777 bge+ cr1,1f
778
779 /* here it looks like we got an inappropriate debug exception. */
780 lis r14,(DBSR_IC|DBSR_BT)@h /* clear the event */
781 rlwinm r11,r11,0,~MSR_DE /* clear DE in the DSRR1 value */
782 mtspr SPRN_DBSR,r14
783 mtspr SPRN_DSRR1,r11
784 lwz r10,PACA_EXDBG+EX_CR(r13) /* restore registers */
785 ld r1,PACA_EXDBG+EX_R1(r13)
786 ld r14,PACA_EXDBG+EX_R14(r13)
787 ld r15,PACA_EXDBG+EX_R15(r13)
788 mtcr r10
789 ld r10,PACA_EXDBG+EX_R10(r13) /* restore registers */
790 ld r11,PACA_EXDBG+EX_R11(r13)
791 mfspr r13,SPRN_SPRG_DBG_SCRATCH
792 rfdi
793
794 /* Normal debug exception */
795 /* XXX We only handle coming from userspace for now since we can't
796 * quite save properly an interrupted kernel state yet
797 */
7981: andi. r14,r11,MSR_PR; /* check for userspace again */
799 beq kernel_dbg_exc; /* if from kernel mode */
800
801 /* Now we mash up things to make it look like we are coming on a
802 * normal exception
803 */
804 mfspr r14,SPRN_DBSR
805 std r14,_DSISR(r1)
806 ld r14,PACA_EXDBG+EX_R14(r13)
807 ld r15,PACA_EXDBG+EX_R15(r13)
808 EXCEPTION_COMMON_DBG(0xd08)
809 addi r3,r1,STACK_INT_FRAME_REGS
810 bl DebugException
811 REST_NVGPRS(r1)
812 b interrupt_return
813
814 START_EXCEPTION(perfmon);
815 NORMAL_EXCEPTION_PROLOG(0x260, BOOKE_INTERRUPT_PERFORMANCE_MONITOR,
816 PROLOG_ADDITION_NONE)
817 EXCEPTION_COMMON(0x260)
818 CHECK_NAPPING()
819 addi r3,r1,STACK_INT_FRAME_REGS
820 /*
821 * XXX: Returning from performance_monitor_exception taken as a
822 * soft-NMI (Linux irqs disabled) may be risky to use interrupt_return
823 * and could cause bugs in return or elsewhere. That case should just
824 * restore registers and return. There is a workaround for one known
825 * problem in interrupt_exit_kernel_prepare().
826 */
827 bl performance_monitor_exception
828 b interrupt_return
829
830/* Doorbell interrupt */
831 MASKABLE_EXCEPTION(0x280, BOOKE_INTERRUPT_DOORBELL,
832 doorbell, doorbell_exception, ACK_NONE)
833
834/* Doorbell critical Interrupt */
835 START_EXCEPTION(doorbell_crit);
836 CRIT_EXCEPTION_PROLOG(0x2a0, BOOKE_INTERRUPT_DOORBELL_CRITICAL,
837 PROLOG_ADDITION_NONE)
838 EXCEPTION_COMMON_CRIT(0x2a0)
839 bl special_reg_save
840 CHECK_NAPPING();
841 addi r3,r1,STACK_INT_FRAME_REGS
842 bl unknown_nmi_exception
843 b ret_from_crit_except
844
845/*
846 * Guest doorbell interrupt
847 * This general exception use GSRRx save/restore registers
848 */
849 START_EXCEPTION(guest_doorbell);
850 GDBELL_EXCEPTION_PROLOG(0x2c0, BOOKE_INTERRUPT_GUEST_DBELL,
851 PROLOG_ADDITION_NONE)
852 EXCEPTION_COMMON(0x2c0)
853 addi r3,r1,STACK_INT_FRAME_REGS
854 bl unknown_exception
855 b interrupt_return
856
857/* Guest Doorbell critical Interrupt */
858 START_EXCEPTION(guest_doorbell_crit);
859 CRIT_EXCEPTION_PROLOG(0x2e0, BOOKE_INTERRUPT_GUEST_DBELL_CRIT,
860 PROLOG_ADDITION_NONE)
861 EXCEPTION_COMMON_CRIT(0x2e0)
862 bl special_reg_save
863 CHECK_NAPPING();
864 addi r3,r1,STACK_INT_FRAME_REGS
865 bl unknown_nmi_exception
866 b ret_from_crit_except
867
868/* Hypervisor call */
869 START_EXCEPTION(hypercall);
870 NORMAL_EXCEPTION_PROLOG(0x310, BOOKE_INTERRUPT_HV_SYSCALL,
871 PROLOG_ADDITION_NONE)
872 EXCEPTION_COMMON(0x310)
873 addi r3,r1,STACK_INT_FRAME_REGS
874 bl unknown_exception
875 b interrupt_return
876
877/* Embedded Hypervisor priviledged */
878 START_EXCEPTION(ehpriv);
879 NORMAL_EXCEPTION_PROLOG(0x320, BOOKE_INTERRUPT_HV_PRIV,
880 PROLOG_ADDITION_NONE)
881 EXCEPTION_COMMON(0x320)
882 addi r3,r1,STACK_INT_FRAME_REGS
883 bl unknown_exception
884 b interrupt_return
885
886/* LRAT Error interrupt */
887 START_EXCEPTION(lrat_error);
888 NORMAL_EXCEPTION_PROLOG(0x340, BOOKE_INTERRUPT_LRAT_ERROR,
889 PROLOG_ADDITION_NONE)
890 EXCEPTION_COMMON(0x340)
891 addi r3,r1,STACK_INT_FRAME_REGS
892 bl unknown_exception
893 b interrupt_return
894
895.macro SEARCH_RESTART_TABLE
896#ifdef CONFIG_RELOCATABLE
897 __LOAD_PACA_TOC(r11)
898 LOAD_REG_ADDR_ALTTOC(r14, r11, __start___restart_table)
899 LOAD_REG_ADDR_ALTTOC(r15, r11, __stop___restart_table)
900#else
901 LOAD_REG_IMMEDIATE_SYM(r14, r11, __start___restart_table)
902 LOAD_REG_IMMEDIATE_SYM(r15, r11, __stop___restart_table)
903#endif
904300:
905 cmpd r14,r15
906 beq 302f
907 ld r11,0(r14)
908 cmpld r10,r11
909 blt 301f
910 ld r11,8(r14)
911 cmpld r10,r11
912 bge 301f
913 ld r11,16(r14)
914 b 303f
915301:
916 addi r14,r14,24
917 b 300b
918302:
919 li r11,0
920303:
921.endm
922
923/*
924 * An interrupt came in while soft-disabled; We mark paca->irq_happened
925 * accordingly and if the interrupt is level sensitive, we hard disable
926 * hard disable (full_mask) corresponds to PACA_IRQ_MUST_HARD_MASK, so
927 * keep these in synch.
928 */
929
930.macro masked_interrupt_book3e paca_irq full_mask
931 std r14,PACA_EXGEN+EX_R14(r13)
932 std r15,PACA_EXGEN+EX_R15(r13)
933
934 lbz r10,PACAIRQHAPPENED(r13)
935 .if \full_mask == 1
936 ori r10,r10,\paca_irq | PACA_IRQ_HARD_DIS
937 .else
938 ori r10,r10,\paca_irq
939 .endif
940 stb r10,PACAIRQHAPPENED(r13)
941
942 .if \full_mask == 1
943 xori r11,r11,MSR_EE /* clear MSR_EE */
944 mtspr SPRN_SRR1,r11
945 .endif
946
947 mfspr r10,SPRN_SRR0
948 SEARCH_RESTART_TABLE
949 cmpdi r11,0
950 beq 1f
951 mtspr SPRN_SRR0,r11 /* return to restart address */
9521:
953
954 lwz r11,PACA_EXGEN+EX_CR(r13)
955 mtcr r11
956 ld r10,PACA_EXGEN+EX_R10(r13)
957 ld r11,PACA_EXGEN+EX_R11(r13)
958 ld r14,PACA_EXGEN+EX_R14(r13)
959 ld r15,PACA_EXGEN+EX_R15(r13)
960 mfspr r13,SPRN_SPRG_GEN_SCRATCH
961 rfi
962 b .
963.endm
964
965masked_interrupt_book3e_0x500:
966 masked_interrupt_book3e PACA_IRQ_EE 1
967
968masked_interrupt_book3e_0x900:
969 ACK_DEC(r10);
970 masked_interrupt_book3e PACA_IRQ_DEC 0
971
972masked_interrupt_book3e_0x980:
973 ACK_FIT(r10);
974 masked_interrupt_book3e PACA_IRQ_DEC 0
975
976masked_interrupt_book3e_0x280:
977masked_interrupt_book3e_0x2c0:
978 masked_interrupt_book3e PACA_IRQ_DBELL 0
979
980/*
981 * This is called from 0x300 and 0x400 handlers after the prologs with
982 * r14 and r15 containing the fault address and error code, with the
983 * original values stashed away in the PACA
984 */
985SYM_CODE_START_LOCAL(storage_fault_common)
986 addi r3,r1,STACK_INT_FRAME_REGS
987 bl do_page_fault
988 b interrupt_return
989SYM_CODE_END(storage_fault_common)
990
991/*
992 * Alignment exception doesn't fit entirely in the 0x100 bytes so it
993 * continues here.
994 */
995SYM_CODE_START_LOCAL(alignment_more)
996 addi r3,r1,STACK_INT_FRAME_REGS
997 bl alignment_exception
998 REST_NVGPRS(r1)
999 b interrupt_return
1000SYM_CODE_END(alignment_more)
1001
1002/*
1003 * Trampolines used when spotting a bad kernel stack pointer in
1004 * the exception entry code.
1005 *
1006 * TODO: move some bits like SRR0 read to trampoline, pass PACA
1007 * index around, etc... to handle crit & mcheck
1008 */
1009BAD_STACK_TRAMPOLINE(0x000)
1010BAD_STACK_TRAMPOLINE(0x100)
1011BAD_STACK_TRAMPOLINE(0x200)
1012BAD_STACK_TRAMPOLINE(0x220)
1013BAD_STACK_TRAMPOLINE(0x260)
1014BAD_STACK_TRAMPOLINE(0x280)
1015BAD_STACK_TRAMPOLINE(0x2a0)
1016BAD_STACK_TRAMPOLINE(0x2c0)
1017BAD_STACK_TRAMPOLINE(0x2e0)
1018BAD_STACK_TRAMPOLINE(0x300)
1019BAD_STACK_TRAMPOLINE(0x310)
1020BAD_STACK_TRAMPOLINE(0x320)
1021BAD_STACK_TRAMPOLINE(0x340)
1022BAD_STACK_TRAMPOLINE(0x400)
1023BAD_STACK_TRAMPOLINE(0x500)
1024BAD_STACK_TRAMPOLINE(0x600)
1025BAD_STACK_TRAMPOLINE(0x700)
1026BAD_STACK_TRAMPOLINE(0x800)
1027BAD_STACK_TRAMPOLINE(0x900)
1028BAD_STACK_TRAMPOLINE(0x980)
1029BAD_STACK_TRAMPOLINE(0x9f0)
1030BAD_STACK_TRAMPOLINE(0xa00)
1031BAD_STACK_TRAMPOLINE(0xb00)
1032BAD_STACK_TRAMPOLINE(0xc00)
1033BAD_STACK_TRAMPOLINE(0xd00)
1034BAD_STACK_TRAMPOLINE(0xd08)
1035BAD_STACK_TRAMPOLINE(0xe00)
1036BAD_STACK_TRAMPOLINE(0xf00)
1037BAD_STACK_TRAMPOLINE(0xf20)
1038
1039_GLOBAL(bad_stack_book3e)
1040 /* XXX: Needs to make SPRN_SPRG_GEN depend on exception type */
1041 mfspr r10,SPRN_SRR0; /* read SRR0 before touching stack */
1042 ld r1,PACAEMERGSP(r13)
1043 subi r1,r1,64+INT_FRAME_SIZE
1044 std r10,_NIP(r1)
1045 std r11,_MSR(r1)
1046 ld r10,PACA_EXGEN+EX_R1(r13) /* FIXME for crit & mcheck */
1047 lwz r11,PACA_EXGEN+EX_CR(r13) /* FIXME for crit & mcheck */
1048 std r10,GPR1(r1)
1049 std r11,_CCR(r1)
1050 mfspr r10,SPRN_DEAR
1051 mfspr r11,SPRN_ESR
1052 std r10,_DEAR(r1)
1053 std r11,_ESR(r1)
1054 SAVE_GPR(0, r1); /* save r0 in stackframe */ \
1055 SAVE_GPRS(2, 9, r1); /* save r2 - r9 in stackframe */ \
1056 ld r3,PACA_EXGEN+EX_R10(r13);/* get back r10 */ \
1057 ld r4,PACA_EXGEN+EX_R11(r13);/* get back r11 */ \
1058 mfspr r5,SPRN_SPRG_GEN_SCRATCH;/* get back r13 XXX can be wrong */ \
1059 std r3,GPR10(r1); /* save r10 to stackframe */ \
1060 std r4,GPR11(r1); /* save r11 to stackframe */ \
1061 SAVE_GPR(12, r1); /* save r12 in stackframe */ \
1062 std r5,GPR13(r1); /* save it to stackframe */ \
1063 mflr r10
1064 mfctr r11
1065 mfxer r12
1066 std r10,_LINK(r1)
1067 std r11,_CTR(r1)
1068 std r12,_XER(r1)
1069 SAVE_NVGPRS(r1)
1070 lhz r12,PACA_TRAP_SAVE(r13)
1071 std r12,_TRAP(r1)
1072 addi r11,r1,INT_FRAME_SIZE
1073 std r11,0(r1)
1074 ZEROIZE_GPR(12)
1075 std r12,0(r11)
1076 LOAD_PACA_TOC()
10771: addi r3,r1,STACK_INT_FRAME_REGS
1078 bl kernel_bad_stack
1079 b 1b
1080
1081/*
1082 * Setup the initial TLB for a core. This current implementation
1083 * assume that whatever we are running off will not conflict with
1084 * the new mapping at PAGE_OFFSET.
1085 */
1086_GLOBAL(initial_tlb_book3e)
1087
1088 /* Look for the first TLB with IPROT set */
1089 mfspr r4,SPRN_TLB0CFG
1090 andi. r3,r4,TLBnCFG_IPROT
1091 lis r3,MAS0_TLBSEL(0)@h
1092 bne found_iprot
1093
1094 mfspr r4,SPRN_TLB1CFG
1095 andi. r3,r4,TLBnCFG_IPROT
1096 lis r3,MAS0_TLBSEL(1)@h
1097 bne found_iprot
1098
1099 mfspr r4,SPRN_TLB2CFG
1100 andi. r3,r4,TLBnCFG_IPROT
1101 lis r3,MAS0_TLBSEL(2)@h
1102 bne found_iprot
1103
1104 lis r3,MAS0_TLBSEL(3)@h
1105 mfspr r4,SPRN_TLB3CFG
1106 /* fall through */
1107
1108found_iprot:
1109 andi. r5,r4,TLBnCFG_HES
1110 bne have_hes
1111
1112 mflr r8 /* save LR */
1113/* 1. Find the index of the entry we're executing in
1114 *
1115 * r3 = MAS0_TLBSEL (for the iprot array)
1116 * r4 = SPRN_TLBnCFG
1117 */
1118 bcl 20,31,$+4 /* Find our address */
1119invstr: mflr r6 /* Make it accessible */
1120 mfmsr r7
1121 rlwinm r5,r7,27,31,31 /* extract MSR[IS] */
1122 mfspr r7,SPRN_PID
1123 slwi r7,r7,16
1124 or r7,r7,r5
1125 mtspr SPRN_MAS6,r7
1126 tlbsx 0,r6 /* search MSR[IS], SPID=PID */
1127
1128 mfspr r3,SPRN_MAS0
1129 rlwinm r5,r3,16,20,31 /* Extract MAS0(Entry) */
1130
1131 mfspr r7,SPRN_MAS1 /* Insure IPROT set */
1132 oris r7,r7,MAS1_IPROT@h
1133 mtspr SPRN_MAS1,r7
1134 tlbwe
1135
1136/* 2. Invalidate all entries except the entry we're executing in
1137 *
1138 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
1139 * r4 = SPRN_TLBnCFG
1140 * r5 = ESEL of entry we are running in
1141 */
1142 andi. r4,r4,TLBnCFG_N_ENTRY /* Extract # entries */
1143 li r6,0 /* Set Entry counter to 0 */
11441: mr r7,r3 /* Set MAS0(TLBSEL) */
1145 rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */
1146 mtspr SPRN_MAS0,r7
1147 tlbre
1148 mfspr r7,SPRN_MAS1
1149 rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */
1150 cmpw r5,r6
1151 beq skpinv /* Dont update the current execution TLB */
1152 mtspr SPRN_MAS1,r7
1153 tlbwe
1154 isync
1155skpinv: addi r6,r6,1 /* Increment */
1156 cmpw r6,r4 /* Are we done? */
1157 bne 1b /* If not, repeat */
1158
1159 /* Invalidate all TLBs */
1160 PPC_TLBILX_ALL(0,R0)
1161 sync
1162 isync
1163
1164/* 3. Setup a temp mapping and jump to it
1165 *
1166 * r3 = MAS0 w/TLBSEL & ESEL for the entry we are running in
1167 * r5 = ESEL of entry we are running in
1168 */
1169 andi. r7,r5,0x1 /* Find an entry not used and is non-zero */
1170 addi r7,r7,0x1
1171 mr r4,r3 /* Set MAS0(TLBSEL) = 1 */
1172 mtspr SPRN_MAS0,r4
1173 tlbre
1174
1175 rlwimi r4,r7,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r7) */
1176 mtspr SPRN_MAS0,r4
1177
1178 mfspr r7,SPRN_MAS1
1179 xori r6,r7,MAS1_TS /* Setup TMP mapping in the other Address space */
1180 mtspr SPRN_MAS1,r6
1181
1182 tlbwe
1183
1184 mfmsr r6
1185 xori r6,r6,MSR_IS
1186 mtspr SPRN_SRR1,r6
1187 bcl 20,31,$+4 /* Find our address */
11881: mflr r6
1189 addi r6,r6,(2f - 1b)
1190 mtspr SPRN_SRR0,r6
1191 rfi
11922:
1193
1194/* 4. Clear out PIDs & Search info
1195 *
1196 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
1197 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1198 * r5 = MAS3
1199 */
1200 li r6,0
1201 mtspr SPRN_MAS6,r6
1202 mtspr SPRN_PID,r6
1203
1204/* 5. Invalidate mapping we started in
1205 *
1206 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
1207 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1208 * r5 = MAS3
1209 */
1210 mtspr SPRN_MAS0,r3
1211 tlbre
1212 mfspr r6,SPRN_MAS1
1213 rlwinm r6,r6,0,2,31 /* clear IPROT and VALID */
1214 mtspr SPRN_MAS1,r6
1215 tlbwe
1216 sync
1217 isync
1218
1219/* 6. Setup KERNELBASE mapping in TLB[0]
1220 *
1221 * r3 = MAS0 w/TLBSEL & ESEL for the entry we started in
1222 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1223 * r5 = MAS3
1224 */
1225 rlwinm r3,r3,0,16,3 /* clear ESEL */
1226 mtspr SPRN_MAS0,r3
1227 lis r6,(MAS1_VALID|MAS1_IPROT)@h
1228 ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l
1229 mtspr SPRN_MAS1,r6
1230
1231 LOAD_REG_IMMEDIATE(r6, PAGE_OFFSET | MAS2_M_IF_NEEDED)
1232 mtspr SPRN_MAS2,r6
1233
1234 rlwinm r5,r5,0,0,25
1235 ori r5,r5,MAS3_SR | MAS3_SW | MAS3_SX
1236 mtspr SPRN_MAS3,r5
1237 li r5,-1
1238 rlwinm r5,r5,0,0,25
1239
1240 tlbwe
1241
1242/* 7. Jump to KERNELBASE mapping
1243 *
1244 * r4 = MAS0 w/TLBSEL & ESEL for the temp mapping
1245 */
1246 /* Now we branch the new virtual address mapped by this entry */
1247 bcl 20,31,$+4 /* Find our address */
12481: mflr r6
1249 addi r6,r6,(2f - 1b)
1250 tovirt(r6,r6)
1251 lis r7,MSR_KERNEL@h
1252 ori r7,r7,MSR_KERNEL@l
1253 mtspr SPRN_SRR0,r6
1254 mtspr SPRN_SRR1,r7
1255 rfi /* start execution out of TLB1[0] entry */
12562:
1257
1258/* 8. Clear out the temp mapping
1259 *
1260 * r4 = MAS0 w/TLBSEL & ESEL for the entry we are running in
1261 */
1262 mtspr SPRN_MAS0,r4
1263 tlbre
1264 mfspr r5,SPRN_MAS1
1265 rlwinm r5,r5,0,2,31 /* clear IPROT and VALID */
1266 mtspr SPRN_MAS1,r5
1267 tlbwe
1268 sync
1269 isync
1270
1271 /* We translate LR and return */
1272 tovirt(r8,r8)
1273 mtlr r8
1274 blr
1275
1276have_hes:
1277 /* Setup MAS 0,1,2,3 and 7 for tlbwe of a 1G entry that maps the
1278 * kernel linear mapping. We also set MAS8 once for all here though
1279 * that will have to be made dependent on whether we are running under
1280 * a hypervisor I suppose.
1281 */
1282
1283 /* BEWARE, MAGIC
1284 * This code is called as an ordinary function on the boot CPU. But to
1285 * avoid duplication, this code is also used in SCOM bringup of
1286 * secondary CPUs. We read the code between the initial_tlb_code_start
1287 * and initial_tlb_code_end labels one instruction at a time and RAM it
1288 * into the new core via SCOM. That doesn't process branches, so there
1289 * must be none between those two labels. It also means if this code
1290 * ever takes any parameters, the SCOM code must also be updated to
1291 * provide them.
1292 */
1293_GLOBAL(a2_tlbinit_code_start)
1294
1295 ori r11,r3,MAS0_WQ_ALLWAYS
1296 oris r11,r11,MAS0_ESEL(3)@h /* Use way 3: workaround A2 erratum 376 */
1297 mtspr SPRN_MAS0,r11
1298 lis r3,(MAS1_VALID | MAS1_IPROT)@h
1299 ori r3,r3,BOOK3E_PAGESZ_1GB << MAS1_TSIZE_SHIFT
1300 mtspr SPRN_MAS1,r3
1301 LOAD_REG_IMMEDIATE(r3, PAGE_OFFSET | MAS2_M)
1302 mtspr SPRN_MAS2,r3
1303 li r3,MAS3_SR | MAS3_SW | MAS3_SX
1304 mtspr SPRN_MAS7_MAS3,r3
1305 li r3,0
1306 mtspr SPRN_MAS8,r3
1307
1308 /* Write the TLB entry */
1309 tlbwe
1310
1311 .globl a2_tlbinit_after_linear_map
1312a2_tlbinit_after_linear_map:
1313
1314 /* Now we branch the new virtual address mapped by this entry */
1315#ifdef CONFIG_RELOCATABLE
1316 __LOAD_PACA_TOC(r5)
1317 LOAD_REG_ADDR_ALTTOC(r3, r5, 1f)
1318#else
1319 LOAD_REG_IMMEDIATE_SYM(r3, r5, 1f)
1320#endif
1321 mtctr r3
1322 bctr
1323
13241: /* We are now running at PAGE_OFFSET, clean the TLB of everything
1325 * else (including IPROTed things left by firmware)
1326 * r4 = TLBnCFG
1327 * r3 = current address (more or less)
1328 */
1329
1330 li r5,0
1331 mtspr SPRN_MAS6,r5
1332 tlbsx 0,r3
1333
1334 rlwinm r9,r4,0,TLBnCFG_N_ENTRY
1335 rlwinm r10,r4,8,0xff
1336 addi r10,r10,-1 /* Get inner loop mask */
1337
1338 li r3,1
1339
1340 mfspr r5,SPRN_MAS1
1341 rlwinm r5,r5,0,(~(MAS1_VALID|MAS1_IPROT))
1342
1343 mfspr r6,SPRN_MAS2
1344 rldicr r6,r6,0,51 /* Extract EPN */
1345
1346 mfspr r7,SPRN_MAS0
1347 rlwinm r7,r7,0,0xffff0fff /* Clear HES and WQ */
1348
1349 rlwinm r8,r7,16,0xfff /* Extract ESEL */
1350
13512: add r4,r3,r8
1352 and r4,r4,r10
1353
1354 rlwimi r7,r4,16,MAS0_ESEL_MASK
1355
1356 mtspr SPRN_MAS0,r7
1357 mtspr SPRN_MAS1,r5
1358 mtspr SPRN_MAS2,r6
1359 tlbwe
1360
1361 addi r3,r3,1
1362 and. r4,r3,r10
1363
1364 bne 3f
1365 addis r6,r6,(1<<30)@h
13663:
1367 cmpw r3,r9
1368 blt 2b
1369
1370 .globl a2_tlbinit_after_iprot_flush
1371a2_tlbinit_after_iprot_flush:
1372
1373 PPC_TLBILX(0,0,R0)
1374 sync
1375 isync
1376
1377 .globl a2_tlbinit_code_end
1378a2_tlbinit_code_end:
1379
1380 /* We translate LR and return */
1381 mflr r3
1382 tovirt(r3,r3)
1383 mtlr r3
1384 blr
1385
1386/*
1387 * Main entry (boot CPU, thread 0)
1388 *
1389 * We enter here from head_64.S, possibly after the prom_init trampoline
1390 * with r3 and r4 already saved to r31 and 30 respectively and in 64 bits
1391 * mode. Anything else is as it was left by the bootloader
1392 *
1393 * Initial requirements of this port:
1394 *
1395 * - Kernel loaded at 0 physical
1396 * - A good lump of memory mapped 0:0 by UTLB entry 0
1397 * - MSR:IS & MSR:DS set to 0
1398 *
1399 * Note that some of the above requirements will be relaxed in the future
1400 * as the kernel becomes smarter at dealing with different initial conditions
1401 * but for now you have to be careful
1402 */
1403_GLOBAL(start_initialization_book3e)
1404 mflr r28
1405
1406 /* First, we need to setup some initial TLBs to map the kernel
1407 * text, data and bss at PAGE_OFFSET. We don't have a real mode
1408 * and always use AS 0, so we just set it up to match our link
1409 * address and never use 0 based addresses.
1410 */
1411 bl initial_tlb_book3e
1412
1413 /* Init global core bits */
1414 bl init_core_book3e
1415
1416 /* Init per-thread bits */
1417 bl init_thread_book3e
1418
1419 /* Return to common init code */
1420 tovirt(r28,r28)
1421 mtlr r28
1422 blr
1423
1424
1425/*
1426 * Secondary core/processor entry
1427 *
1428 * This is entered for thread 0 of a secondary core, all other threads
1429 * are expected to be stopped. It's similar to start_initialization_book3e
1430 * except that it's generally entered from the holding loop in head_64.S
1431 * after CPUs have been gathered by Open Firmware.
1432 *
1433 * We assume we are in 32 bits mode running with whatever TLB entry was
1434 * set for us by the firmware or POR engine.
1435 */
1436_GLOBAL(book3e_secondary_core_init_tlb_set)
1437 li r4,1
1438 b generic_secondary_smp_init
1439
1440_GLOBAL(book3e_secondary_core_init)
1441 mflr r28
1442
1443 /* Do we need to setup initial TLB entry ? */
1444 cmplwi r4,0
1445 bne 2f
1446
1447 /* Setup TLB for this core */
1448 bl initial_tlb_book3e
1449
1450 /* We can return from the above running at a different
1451 * address, so recalculate r2 (TOC)
1452 */
1453 bl relative_toc
1454
1455 /* Init global core bits */
14562: bl init_core_book3e
1457
1458 /* Init per-thread bits */
14593: bl init_thread_book3e
1460
1461 /* Return to common init code at proper virtual address.
1462 *
1463 * Due to various previous assumptions, we know we entered this
1464 * function at either the final PAGE_OFFSET mapping or using a
1465 * 1:1 mapping at 0, so we don't bother doing a complicated check
1466 * here, we just ensure the return address has the right top bits.
1467 *
1468 * Note that if we ever want to be smarter about where we can be
1469 * started from, we have to be careful that by the time we reach
1470 * the code below we may already be running at a different location
1471 * than the one we were called from since initial_tlb_book3e can
1472 * have moved us already.
1473 */
1474 cmpdi cr0,r28,0
1475 blt 1f
1476 lis r3,PAGE_OFFSET@highest
1477 sldi r3,r3,32
1478 or r28,r28,r3
14791: mtlr r28
1480 blr
1481
1482_GLOBAL(book3e_secondary_thread_init)
1483 mflr r28
1484 b 3b
1485
1486_GLOBAL(init_core_book3e)
1487 /* Establish the interrupt vector base */
1488 tovirt(r2,r2)
1489 LOAD_REG_ADDR(r3, interrupt_base_book3e)
1490 mtspr SPRN_IVPR,r3
1491 sync
1492 blr
1493
1494SYM_CODE_START_LOCAL(init_thread_book3e)
1495 lis r3,(SPRN_EPCR_ICM | SPRN_EPCR_GICM)@h
1496 mtspr SPRN_EPCR,r3
1497
1498 /* Make sure interrupts are off */
1499 wrteei 0
1500
1501 /* disable all timers and clear out status */
1502 li r3,0
1503 mtspr SPRN_TCR,r3
1504 mfspr r3,SPRN_TSR
1505 mtspr SPRN_TSR,r3
1506
1507 blr
1508SYM_CODE_END(init_thread_book3e)
1509
1510_GLOBAL(__setup_base_ivors)
1511 SET_IVOR(0, 0x020) /* Critical Input */
1512 SET_IVOR(1, 0x000) /* Machine Check */
1513 SET_IVOR(2, 0x060) /* Data Storage */
1514 SET_IVOR(3, 0x080) /* Instruction Storage */
1515 SET_IVOR(4, 0x0a0) /* External Input */
1516 SET_IVOR(5, 0x0c0) /* Alignment */
1517 SET_IVOR(6, 0x0e0) /* Program */
1518 SET_IVOR(7, 0x100) /* FP Unavailable */
1519 SET_IVOR(8, 0x120) /* System Call */
1520 SET_IVOR(9, 0x140) /* Auxiliary Processor Unavailable */
1521 SET_IVOR(10, 0x160) /* Decrementer */
1522 SET_IVOR(11, 0x180) /* Fixed Interval Timer */
1523 SET_IVOR(12, 0x1a0) /* Watchdog Timer */
1524 SET_IVOR(13, 0x1c0) /* Data TLB Error */
1525 SET_IVOR(14, 0x1e0) /* Instruction TLB Error */
1526 SET_IVOR(15, 0x040) /* Debug */
1527
1528 sync
1529
1530 blr
1531
1532_GLOBAL(setup_altivec_ivors)
1533 SET_IVOR(32, 0x200) /* AltiVec Unavailable */
1534 SET_IVOR(33, 0x220) /* AltiVec Assist */
1535 blr
1536
1537_GLOBAL(setup_perfmon_ivor)
1538 SET_IVOR(35, 0x260) /* Performance Monitor */
1539 blr
1540
1541_GLOBAL(setup_doorbell_ivors)
1542 SET_IVOR(36, 0x280) /* Processor Doorbell */
1543 SET_IVOR(37, 0x2a0) /* Processor Doorbell Crit */
1544 blr
1545
1546_GLOBAL(setup_ehv_ivors)
1547 SET_IVOR(40, 0x300) /* Embedded Hypervisor System Call */
1548 SET_IVOR(41, 0x320) /* Embedded Hypervisor Privilege */
1549 SET_IVOR(38, 0x2c0) /* Guest Processor Doorbell */
1550 SET_IVOR(39, 0x2e0) /* Guest Processor Doorbell Crit/MC */
1551 blr
1552
1553_GLOBAL(setup_lrat_ivor)
1554 SET_IVOR(42, 0x340) /* LRAT Error */
1555 blr