1 #ifndef _ASM_POWERPC_EXCEPTION_H
2 #define _ASM_POWERPC_EXCEPTION_H
4 * Extracted from head_64.S
7 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
9 * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
10 * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
11 * Adapted for Power Macintosh by Paul Mackerras.
12 * Low-level exception handlers and MMU support
13 * rewritten by Paul Mackerras.
14 * Copyright (C) 1996 Paul Mackerras.
16 * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
17 * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
19 * This file contains the low-level support and setup for the
20 * PowerPC-64 platform, including trap and interrupt dispatch.
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
28 * The following macros define the code that appears as
29 * the prologue to each of the exception handlers. They
30 * are split into two parts to allow a single kernel binary
31 * to be used for pSeries and iSeries.
33 * We make as much of the exception code common between native
34 * exception handlers (including pSeries LPAR) and iSeries LPAR
35 * implementations as possible.
37 #include <asm/head-64.h>
51 #define EX_PPR 88 /* SMT thread status register (priority) */
54 #define STF_ENTRY_BARRIER_SLOT \
55 STF_ENTRY_BARRIER_FIXUP_SECTION; \
60 #define STF_EXIT_BARRIER_SLOT \
61 STF_EXIT_BARRIER_FIXUP_SECTION; \
69 #define ENTRY_FLUSH_SLOT \
70 ENTRY_FLUSH_FIXUP_SECTION; \
76 * r10 must be free to use, r13 must be paca
78 #define INTERRUPT_TO_KERNEL \
79 STF_ENTRY_BARRIER_SLOT; \
83 * Macros for annotating the expected destination of (h)rfid
85 * The nop instructions allow us to insert one or more instructions to flush the
86 * L1-D cache when returning to userspace or a guest.
88 #define RFI_FLUSH_SLOT \
89 RFI_FLUSH_FIXUP_SECTION; \
94 #define RFI_TO_KERNEL \
98 STF_EXIT_BARRIER_SLOT; \
103 #define RFI_TO_USER_OR_KERNEL \
104 STF_EXIT_BARRIER_SLOT; \
109 #define RFI_TO_GUEST \
110 STF_EXIT_BARRIER_SLOT; \
115 #define HRFI_TO_KERNEL \
118 #define HRFI_TO_USER \
119 STF_EXIT_BARRIER_SLOT; \
122 b hrfi_flush_fallback
124 #define HRFI_TO_USER_OR_KERNEL \
125 STF_EXIT_BARRIER_SLOT; \
128 b hrfi_flush_fallback
130 #define HRFI_TO_GUEST \
131 STF_EXIT_BARRIER_SLOT; \
134 b hrfi_flush_fallback
136 #define HRFI_TO_UNKNOWN \
137 STF_EXIT_BARRIER_SLOT; \
140 b hrfi_flush_fallback
142 #ifdef CONFIG_RELOCATABLE
143 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
144 mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
145 LOAD_HANDLER(r12,label); \
147 mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
149 mtmsrd r10,1; /* Set RI (EE=0) */ \
152 /* If not relocatable, we can jump directly -- and save messing with LR */
153 #define __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
154 mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
155 mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
157 mtmsrd r10,1; /* Set RI (EE=0) */ \
160 #define EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
161 __EXCEPTION_RELON_PROLOG_PSERIES_1(label, h) \
164 * As EXCEPTION_PROLOG_PSERIES(), except we've already got relocation on
165 * so no need to rfid. Save lr in case we're CONFIG_RELOCATABLE, in which
166 * case EXCEPTION_RELON_PROLOG_PSERIES_1 will be using lr.
168 #define EXCEPTION_RELON_PROLOG_PSERIES(area, label, h, extra, vec) \
169 EXCEPTION_PROLOG_0(area); \
170 EXCEPTION_PROLOG_1(area, extra, vec); \
171 EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
174 * We're short on space and time in the exception prolog, so we can't
175 * use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
176 * Instead we get the base of the kernel from paca->kernelbase and or in the low
177 * part of label. This requires that the label be within 64KB of kernelbase, and
178 * that kernelbase be 64K aligned.
180 #define LOAD_HANDLER(reg, label) \
181 ld reg,PACAKBASE(r13); /* get high part of &label */ \
182 ori reg,reg,FIXED_SYMBOL_ABS_ADDR(label);
184 #define __LOAD_HANDLER(reg, label) \
185 ld reg,PACAKBASE(r13); \
186 ori reg,reg,(ABS_ADDR(label))@l;
188 /* Exception register prefixes */
192 #if defined(CONFIG_RELOCATABLE)
194 * If we support interrupts with relocation on AND we're a relocatable kernel,
195 * we need to use CTR to get to the 2nd level handler. So, save/restore it
198 #define SAVE_CTR(reg, area) mfctr reg ; std reg,area+EX_CTR(r13)
199 #define GET_CTR(reg, area) ld reg,area+EX_CTR(r13)
200 #define RESTORE_CTR(reg, area) ld reg,area+EX_CTR(r13) ; mtctr reg
202 /* ...else CTR is unused and in register. */
203 #define SAVE_CTR(reg, area)
204 #define GET_CTR(reg, area) mfctr reg
205 #define RESTORE_CTR(reg, area)
209 * PPR save/restore macros used in exceptions_64s.S
210 * Used for P7 or later processors
212 #define SAVE_PPR(area, ra, rb) \
213 BEGIN_FTR_SECTION_NESTED(940) \
214 ld ra,PACACURRENT(r13); \
215 ld rb,area+EX_PPR(r13); /* Read PPR from paca */ \
216 std rb,TASKTHREADPPR(ra); \
217 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
219 #define RESTORE_PPR_PACA(area, ra) \
220 BEGIN_FTR_SECTION_NESTED(941) \
221 ld ra,area+EX_PPR(r13); \
223 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
226 * Get an SPR into a register if the CPU has the given feature
228 #define OPT_GET_SPR(ra, spr, ftr) \
229 BEGIN_FTR_SECTION_NESTED(943) \
231 END_FTR_SECTION_NESTED(ftr,ftr,943)
234 * Set an SPR from a register if the CPU has the given feature
236 #define OPT_SET_SPR(ra, spr, ftr) \
237 BEGIN_FTR_SECTION_NESTED(943) \
239 END_FTR_SECTION_NESTED(ftr,ftr,943)
242 * Save a register to the PACA if the CPU has the given feature
244 #define OPT_SAVE_REG_TO_PACA(offset, ra, ftr) \
245 BEGIN_FTR_SECTION_NESTED(943) \
246 std ra,offset(r13); \
247 END_FTR_SECTION_NESTED(ftr,ftr,943)
249 #define EXCEPTION_PROLOG_0_PACA(area) \
250 std r9,area+EX_R9(r13); /* save r9 */ \
251 OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR); \
253 std r10,area+EX_R10(r13); /* save r10 - r12 */ \
254 OPT_GET_SPR(r10, SPRN_CFAR, CPU_FTR_CFAR)
256 #define EXCEPTION_PROLOG_0(area) \
258 EXCEPTION_PROLOG_0_PACA(area)
260 #define __EXCEPTION_PROLOG_1(area, extra, vec) \
261 OPT_SAVE_REG_TO_PACA(area+EX_PPR, r9, CPU_FTR_HAS_PPR); \
262 OPT_SAVE_REG_TO_PACA(area+EX_CFAR, r10, CPU_FTR_CFAR); \
263 INTERRUPT_TO_KERNEL; \
264 SAVE_CTR(r10, area); \
267 std r11,area+EX_R11(r13); \
268 std r12,area+EX_R12(r13); \
270 std r10,area+EX_R13(r13)
271 #define EXCEPTION_PROLOG_1(area, extra, vec) \
272 __EXCEPTION_PROLOG_1(area, extra, vec)
274 #define __EXCEPTION_PROLOG_PSERIES_1(label, h) \
275 ld r10,PACAKMSR(r13); /* get MSR value for kernel */ \
276 mfspr r11,SPRN_##h##SRR0; /* save SRR0 */ \
277 LOAD_HANDLER(r12,label) \
278 mtspr SPRN_##h##SRR0,r12; \
279 mfspr r12,SPRN_##h##SRR1; /* and SRR1 */ \
280 mtspr SPRN_##h##SRR1,r10; \
282 b . /* prevent speculative execution */
283 #define EXCEPTION_PROLOG_PSERIES_1(label, h) \
284 __EXCEPTION_PROLOG_PSERIES_1(label, h)
286 #define EXCEPTION_PROLOG_PSERIES(area, label, h, extra, vec) \
287 EXCEPTION_PROLOG_0(area); \
288 EXCEPTION_PROLOG_1(area, extra, vec); \
289 EXCEPTION_PROLOG_PSERIES_1(label, h);
291 /* Have the PACA in r13 already */
292 #define EXCEPTION_PROLOG_PSERIES_PACA(area, label, h, extra, vec) \
293 EXCEPTION_PROLOG_0_PACA(area); \
294 EXCEPTION_PROLOG_1(area, extra, vec); \
295 EXCEPTION_PROLOG_PSERIES_1(label, h);
297 #define __KVMTEST(h, n) \
298 lbz r10,HSTATE_IN_GUEST(r13); \
302 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
304 * If hv is possible, interrupts come into to the hv version
305 * of the kvmppc_interrupt code, which then jumps to the PR handler,
306 * kvmppc_interrupt_pr, if the guest is a PR guest.
308 #define kvmppc_interrupt kvmppc_interrupt_hv
310 #define kvmppc_interrupt kvmppc_interrupt_pr
313 #ifdef CONFIG_RELOCATABLE
314 #define BRANCH_TO_COMMON(reg, label) \
315 __LOAD_HANDLER(reg, label); \
320 #define BRANCH_TO_COMMON(reg, label) \
325 #define __KVM_HANDLER_PROLOG(area, n) \
326 BEGIN_FTR_SECTION_NESTED(947) \
327 ld r10,area+EX_CFAR(r13); \
328 std r10,HSTATE_CFAR(r13); \
329 END_FTR_SECTION_NESTED(CPU_FTR_CFAR,CPU_FTR_CFAR,947); \
330 BEGIN_FTR_SECTION_NESTED(948) \
331 ld r10,area+EX_PPR(r13); \
332 std r10,HSTATE_PPR(r13); \
333 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
334 ld r10,area+EX_R10(r13); \
335 stw r9,HSTATE_SCRATCH1(r13); \
336 ld r9,area+EX_R9(r13); \
337 std r12,HSTATE_SCRATCH0(r13); \
339 #define __KVM_HANDLER(area, h, n) \
340 __KVM_HANDLER_PROLOG(area, n) \
344 #define __KVM_HANDLER_SKIP(area, h, n) \
345 cmpwi r10,KVM_GUEST_MODE_SKIP; \
346 ld r10,area+EX_R10(r13); \
348 stw r9,HSTATE_SCRATCH1(r13); \
349 BEGIN_FTR_SECTION_NESTED(948) \
350 ld r9,area+EX_PPR(r13); \
351 std r9,HSTATE_PPR(r13); \
352 END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948); \
353 ld r9,area+EX_R9(r13); \
354 std r12,HSTATE_SCRATCH0(r13); \
356 b kvmppc_interrupt; \
357 89: mtocrf 0x80,r9; \
358 ld r9,area+EX_R9(r13); \
359 b kvmppc_skip_##h##interrupt
361 #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
362 #define KVMTEST(h, n) __KVMTEST(h, n)
363 #define KVM_HANDLER(area, h, n) __KVM_HANDLER(area, h, n)
364 #define KVM_HANDLER_SKIP(area, h, n) __KVM_HANDLER_SKIP(area, h, n)
367 #define KVMTEST(h, n)
368 #define KVM_HANDLER(area, h, n)
369 #define KVM_HANDLER_SKIP(area, h, n)
375 * The common exception prolog is used for all except a few exceptions
376 * such as a segment miss on a kernel address. We have to be prepared
377 * to take another exception from the point where we first touch the
378 * kernel stack onwards.
380 * On entry r13 points to the paca, r9-r13 are saved in the paca,
381 * r9 contains the saved CR, r11 and r12 contain the saved SRR0 and
382 * SRR1, and relocation is on.
384 #define EXCEPTION_PROLOG_COMMON(n, area) \
385 andi. r10,r12,MSR_PR; /* See if coming from user */ \
386 mr r10,r1; /* Save r1 */ \
387 subi r1,r1,INT_FRAME_SIZE; /* alloc frame on kernel stack */ \
389 ld r1,PACAKSAVE(r13); /* kernel stack to use */ \
390 1: cmpdi cr1,r1,-INT_FRAME_SIZE; /* check if r1 is in userspace */ \
391 blt+ cr1,3f; /* abort if it is */ \
392 li r1,(n); /* will be reloaded later */ \
393 sth r1,PACA_TRAP_SAVE(r13); \
394 std r3,area+EX_R3(r13); \
395 addi r3,r13,area; /* r3 -> where regs are saved*/ \
396 RESTORE_CTR(r1, area); \
398 3: std r9,_CCR(r1); /* save CR in stackframe */ \
399 std r11,_NIP(r1); /* save SRR0 in stackframe */ \
400 std r12,_MSR(r1); /* save SRR1 in stackframe */ \
401 std r10,0(r1); /* make stack chain pointer */ \
402 std r0,GPR0(r1); /* save r0 in stackframe */ \
403 std r10,GPR1(r1); /* save r1 in stackframe */ \
404 beq 4f; /* if from kernel mode */ \
405 ACCOUNT_CPU_USER_ENTRY(r13, r9, r10); \
406 SAVE_PPR(area, r9, r10); \
407 4: EXCEPTION_PROLOG_COMMON_2(area) \
408 EXCEPTION_PROLOG_COMMON_3(n) \
411 /* Save original regs values from save area to stack frame. */
412 #define EXCEPTION_PROLOG_COMMON_2(area) \
413 ld r9,area+EX_R9(r13); /* move r9, r10 to stackframe */ \
414 ld r10,area+EX_R10(r13); \
417 ld r9,area+EX_R11(r13); /* move r11 - r13 to stackframe */ \
418 ld r10,area+EX_R12(r13); \
419 ld r11,area+EX_R13(r13); \
423 BEGIN_FTR_SECTION_NESTED(66); \
424 ld r10,area+EX_CFAR(r13); \
425 std r10,ORIG_GPR3(r1); \
426 END_FTR_SECTION_NESTED(CPU_FTR_CFAR, CPU_FTR_CFAR, 66); \
427 GET_CTR(r10, area); \
430 #define EXCEPTION_PROLOG_COMMON_3(n) \
431 std r2,GPR2(r1); /* save r2 in stackframe */ \
432 SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
433 SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
434 mflr r9; /* Get LR, later save to stack */ \
435 ld r2,PACATOC(r13); /* get kernel TOC into r2 */ \
437 lbz r10,PACASOFTIRQEN(r13); \
438 mfspr r11,SPRN_XER; /* save XER in stackframe */ \
442 std r9,_TRAP(r1); /* set trap number */ \
444 ld r11,exception_marker@toc(r2); \
445 std r10,RESULT(r1); /* clear regs->result */ \
446 std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */
451 #define STD_EXCEPTION_PSERIES(vec, label) \
452 SET_SCRATCH0(r13); /* save r13 */ \
453 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label, \
454 EXC_STD, KVMTEST_PR, vec); \
456 /* Version of above for when we have to branch out-of-line */
457 #define __OOL_EXCEPTION(vec, label, hdlr) \
459 EXCEPTION_PROLOG_0(PACA_EXGEN) \
462 #define STD_EXCEPTION_PSERIES_OOL(vec, label) \
463 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_PR, vec); \
464 EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
466 #define STD_EXCEPTION_HV(loc, vec, label) \
467 SET_SCRATCH0(r13); /* save r13 */ \
468 EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label, \
469 EXC_HV, KVMTEST_HV, vec);
471 #define STD_EXCEPTION_HV_OOL(vec, label) \
472 EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST_HV, vec); \
473 EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
475 #define STD_RELON_EXCEPTION_PSERIES(loc, vec, label) \
476 /* No guest interrupts come through here */ \
477 SET_SCRATCH0(r13); /* save r13 */ \
478 EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_STD, NOTEST, vec);
480 #define STD_RELON_EXCEPTION_PSERIES_OOL(vec, label) \
481 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec); \
482 EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_STD)
484 #define STD_RELON_EXCEPTION_HV(loc, vec, label) \
485 /* No guest interrupts come through here */ \
486 SET_SCRATCH0(r13); /* save r13 */ \
487 EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label, EXC_HV, NOTEST, vec);
489 #define STD_RELON_EXCEPTION_HV_OOL(vec, label) \
490 EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, vec); \
491 EXCEPTION_RELON_PROLOG_PSERIES_1(label, EXC_HV)
493 /* This associate vector numbers with bits in paca->irq_happened */
494 #define SOFTEN_VALUE_0x500 PACA_IRQ_EE
495 #define SOFTEN_VALUE_0x900 PACA_IRQ_DEC
496 #define SOFTEN_VALUE_0x980 PACA_IRQ_DEC
497 #define SOFTEN_VALUE_0xa00 PACA_IRQ_DBELL
498 #define SOFTEN_VALUE_0xe80 PACA_IRQ_DBELL
499 #define SOFTEN_VALUE_0xe60 PACA_IRQ_HMI
500 #define SOFTEN_VALUE_0xea0 PACA_IRQ_EE
502 #define __SOFTEN_TEST(h, vec) \
503 lbz r10,PACASOFTIRQEN(r13); \
505 li r10,SOFTEN_VALUE_##vec; \
506 beq masked_##h##interrupt
508 #define _SOFTEN_TEST(h, vec) __SOFTEN_TEST(h, vec)
510 #define SOFTEN_TEST_PR(vec) \
511 KVMTEST(EXC_STD, vec); \
512 _SOFTEN_TEST(EXC_STD, vec)
514 #define SOFTEN_TEST_HV(vec) \
515 KVMTEST(EXC_HV, vec); \
516 _SOFTEN_TEST(EXC_HV, vec)
518 #define KVMTEST_PR(vec) \
519 KVMTEST(EXC_STD, vec)
521 #define KVMTEST_HV(vec) \
524 #define SOFTEN_NOTEST_PR(vec) _SOFTEN_TEST(EXC_STD, vec)
525 #define SOFTEN_NOTEST_HV(vec) _SOFTEN_TEST(EXC_HV, vec)
527 #define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
528 SET_SCRATCH0(r13); /* save r13 */ \
529 EXCEPTION_PROLOG_0(PACA_EXGEN); \
530 __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
531 EXCEPTION_PROLOG_PSERIES_1(label, h);
533 #define _MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
534 __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra)
536 #define MASKABLE_EXCEPTION_PSERIES(loc, vec, label) \
537 _MASKABLE_EXCEPTION_PSERIES(vec, label, \
538 EXC_STD, SOFTEN_TEST_PR)
540 #define MASKABLE_EXCEPTION_PSERIES_OOL(vec, label) \
541 EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_PR, vec); \
542 EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
544 #define MASKABLE_EXCEPTION_HV(loc, vec, label) \
545 _MASKABLE_EXCEPTION_PSERIES(vec, label, \
546 EXC_HV, SOFTEN_TEST_HV)
548 #define MASKABLE_EXCEPTION_HV_OOL(vec, label) \
549 EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_TEST_HV, vec); \
550 EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
552 #define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
553 SET_SCRATCH0(r13); /* save r13 */ \
554 EXCEPTION_PROLOG_0(PACA_EXGEN); \
555 __EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
556 EXCEPTION_RELON_PROLOG_PSERIES_1(label, h)
558 #define _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
559 __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra)
561 #define MASKABLE_RELON_EXCEPTION_PSERIES(loc, vec, label) \
562 _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \
563 EXC_STD, SOFTEN_NOTEST_PR)
565 #define MASKABLE_RELON_EXCEPTION_HV(loc, vec, label) \
566 _MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, \
567 EXC_HV, SOFTEN_NOTEST_HV)
569 #define MASKABLE_RELON_EXCEPTION_HV_OOL(vec, label) \
570 EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_HV, vec); \
571 EXCEPTION_PROLOG_PSERIES_1(label, EXC_HV)
573 #define MASKABLE_RELON_EXCEPTION_PSERIES_OOL(vec, label) \
574 EXCEPTION_PROLOG_1(PACA_EXGEN, SOFTEN_NOTEST_PR, vec); \
575 EXCEPTION_PROLOG_PSERIES_1(label, EXC_STD)
578 * Our exception common code can be passed various "additions"
579 * to specify the behaviour of interrupts, whether to kick the
584 * This addition reconciles our actual IRQ state with the various software
585 * flags that track it. This may call C code.
587 #define ADD_RECONCILE RECONCILE_IRQ_STATE(r10,r11)
592 #define RUNLATCH_ON \
594 CURRENT_THREAD_INFO(r3, r1); \
595 ld r4,TI_LOCAL_FLAGS(r3); \
596 andi. r0,r4,_TLF_RUNLATCH; \
597 beql ppc64_runlatch_on_trampoline; \
598 END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
600 #define EXCEPTION_COMMON(trap, label, hdlr, ret, additions) \
601 EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
602 /* Volatile regs are potentially clobbered here */ \
604 addi r3,r1,STACK_FRAME_OVERHEAD; \
608 #define STD_EXCEPTION_COMMON(trap, label, hdlr) \
609 EXCEPTION_COMMON(trap, label, hdlr, ret_from_except, \
610 ADD_NVGPRS;ADD_RECONCILE)
613 * Like STD_EXCEPTION_COMMON, but for exceptions that can occur
614 * in the idle task and therefore need the special idle handling
615 * (finish nap and runlatch)
617 #define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr) \
618 EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \
619 FINISH_NAP;ADD_RECONCILE;RUNLATCH_ON)
622 * When the idle code in power4_idle puts the CPU into NAP mode,
623 * it has to do so in a loop, and relies on the external interrupt
624 * and decrementer interrupt entry code to get it out of the loop.
625 * It sets the _TLF_NAPPING bit in current_thread_info()->local_flags
626 * to signal that it is in the loop and needs help to get out.
628 #ifdef CONFIG_PPC_970_NAP
631 CURRENT_THREAD_INFO(r11, r1); \
632 ld r9,TI_LOCAL_FLAGS(r11); \
633 andi. r10,r9,_TLF_NAPPING; \
634 bnel power4_fixup_nap; \
635 END_FTR_SECTION_IFSET(CPU_FTR_CAN_NAP)
640 #endif /* _ASM_POWERPC_EXCEPTION_H */