summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/idle_book3s.S
blob: 2265c6398a17ec4af7fc5983df9dad7443ac2fce (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
/*
 *  This file contains idle entry/exit functions for POWER7,
 *  POWER8 and POWER9 CPUs.
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */

#include <linux/threads.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <asm/cputable.h>
#include <asm/thread_info.h>
#include <asm/ppc_asm.h>
#include <asm/asm-offsets.h>
#include <asm/ppc-opcode.h>
#include <asm/hw_irq.h>
#include <asm/kvm_book3s_asm.h>
#include <asm/opal.h>
#include <asm/cpuidle.h>
#include <asm/book3s/64/mmu-hash.h>
#include <asm/mmu.h>

#undef DEBUG

/*
 * Use unused space in the interrupt stack to save and restore
 * registers for winkle support.
 */
#define _SDR1	GPR3
#define _RPR	GPR4
#define _SPURR	GPR5
#define _PURR	GPR6
#define _TSCR	GPR7
#define _DSCR	GPR8
#define _AMOR	GPR9
#define _WORT	GPR10
#define _WORC	GPR11
#define _PTCR	GPR12

#define PSSCR_HV_TEMPLATE	PSSCR_ESL | PSSCR_EC | \
				PSSCR_PSLL_MASK | PSSCR_TR_MASK | \
				PSSCR_MTL_MASK

	.text

/*
 * Used by threads before entering deep idle states. Saves SPRs
 * in interrupt stack frame
 */
save_sprs_to_stack:
	/*
	 * Note all register i.e per-core, per-subcore or per-thread is saved
	 * here since any thread in the core might wake up first
	 */
BEGIN_FTR_SECTION
	mfspr	r3,SPRN_PTCR
	std	r3,_PTCR(r1)
	/*
	 * Note - SDR1 is dropped in Power ISA v3. Hence not restoring
	 * SDR1 here
	 */
FTR_SECTION_ELSE
	mfspr	r3,SPRN_SDR1
	std	r3,_SDR1(r1)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
	mfspr	r3,SPRN_RPR
	std	r3,_RPR(r1)
	mfspr	r3,SPRN_SPURR
	std	r3,_SPURR(r1)
	mfspr	r3,SPRN_PURR
	std	r3,_PURR(r1)
	mfspr	r3,SPRN_TSCR
	std	r3,_TSCR(r1)
	mfspr	r3,SPRN_DSCR
	std	r3,_DSCR(r1)
	mfspr	r3,SPRN_AMOR
	std	r3,_AMOR(r1)
	mfspr	r3,SPRN_WORT
	std	r3,_WORT(r1)
	mfspr	r3,SPRN_WORC
	std	r3,_WORC(r1)

	blr

/*
 * Used by threads when the lock bit of core_idle_state is set.
 * Threads will spin in HMT_LOW until the lock bit is cleared.
 * r14 - pointer to core_idle_state
 * r15 - used to load contents of core_idle_state
 */

core_idle_lock_held:
	HMT_LOW
3:	lwz	r15,0(r14)
	andi.   r15,r15,PNV_CORE_IDLE_LOCK_BIT
	bne	3b
	HMT_MEDIUM
	lwarx	r15,0,r14
	blr

/*
 * Pass requested state in r3:
 *	r3 - PNV_THREAD_NAP/SLEEP/WINKLE in POWER8
 *	   - Requested STOP state in POWER9
 *
 * To check IRQ_HAPPENED in r4
 * 	0 - don't check
 * 	1 - check
 *
 * Address to 'rfid' to in r5
 */
_GLOBAL(pnv_powersave_common)
	/* Use r3 to pass state nap/sleep/winkle */
	/* NAP is a state loss, we create a regs frame on the
	 * stack, fill it up with the state we care about and
	 * stick a pointer to it in PACAR1. We really only
	 * need to save PC, some CR bits and the NV GPRs,
	 * but for now an interrupt frame will do.
	 */
	mflr	r0
	std	r0,16(r1)
	stdu	r1,-INT_FRAME_SIZE(r1)
	std	r0,_LINK(r1)
	std	r0,_NIP(r1)

	/* Hard disable interrupts */
	mfmsr	r9
	rldicl	r9,r9,48,1
	rotldi	r9,r9,16
	mtmsrd	r9,1			/* hard-disable interrupts */

	/* Check if something happened while soft-disabled */
	lbz	r0,PACAIRQHAPPENED(r13)
	andi.	r0,r0,~PACA_IRQ_HARD_DIS@l
	beq	1f
	cmpwi	cr0,r4,0
	beq	1f
	addi	r1,r1,INT_FRAME_SIZE
	ld	r0,16(r1)
	li	r3,0			/* Return 0 (no nap) */
	mtlr	r0
	blr

1:	/* We mark irqs hard disabled as this is the state we'll
	 * be in when returning and we need to tell arch_local_irq_restore()
	 * about it
	 */
	li	r0,PACA_IRQ_HARD_DIS
	stb	r0,PACAIRQHAPPENED(r13)

	/* We haven't lost state ... yet */
	li	r0,0
	stb	r0,PACA_NAPSTATELOST(r13)

	/* Continue saving state */
	SAVE_GPR(2, r1)
	SAVE_NVGPRS(r1)
	mfcr	r4
	std	r4,_CCR(r1)
	std	r9,_MSR(r1)
	std	r1,PACAR1(r13)

#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
	/* Tell KVM we're entering idle */
	li	r4,KVM_HWTHREAD_IN_IDLE
	stb	r4,HSTATE_HWTHREAD_STATE(r13)
#endif

	/*
	 * Go to real mode to do the nap, as required by the architecture.
	 * Also, we need to be in real mode before setting hwthread_state,
	 * because as soon as we do that, another thread can switch
	 * the MMU context to the guest.
	 */
	LOAD_REG_IMMEDIATE(r7, MSR_IDLE)
	li	r6, MSR_RI
	andc	r6, r9, r6
	mtmsrd	r6, 1		/* clear RI before setting SRR0/1 */
	mtspr	SPRN_SRR0, r5
	mtspr	SPRN_SRR1, r7
	rfid

	.globl pnv_enter_arch207_idle_mode
pnv_enter_arch207_idle_mode:
	stb	r3,PACA_THREAD_IDLE_STATE(r13)
	cmpwi	cr3,r3,PNV_THREAD_SLEEP
	bge	cr3,2f
	IDLE_STATE_ENTER_SEQ(PPC_NAP)
	/* No return */
2:
	/* Sleep or winkle */
	lbz	r7,PACA_THREAD_MASK(r13)
	ld	r14,PACA_CORE_IDLE_STATE_PTR(r13)
lwarx_loop1:
	lwarx	r15,0,r14

	andi.   r9,r15,PNV_CORE_IDLE_LOCK_BIT
	bnel	core_idle_lock_held

	andc	r15,r15,r7			/* Clear thread bit */

	andi.	r15,r15,PNV_CORE_IDLE_THREAD_BITS

/*
 * If cr0 = 0, then current thread is the last thread of the core entering
 * sleep. Last thread needs to execute the hardware bug workaround code if
 * required by the platform.
 * Make the workaround call unconditionally here. The below branch call is
 * patched out when the idle states are discovered if the platform does not
 * require it.
 */
.global pnv_fastsleep_workaround_at_entry
pnv_fastsleep_workaround_at_entry:
	beq	fastsleep_workaround_at_entry

	stwcx.	r15,0,r14
	bne-	lwarx_loop1
	isync

common_enter: /* common code for all the threads entering sleep or winkle */
	bgt	cr3,enter_winkle
	IDLE_STATE_ENTER_SEQ(PPC_SLEEP)

fastsleep_workaround_at_entry:
	ori	r15,r15,PNV_CORE_IDLE_LOCK_BIT
	stwcx.	r15,0,r14
	bne-	lwarx_loop1
	isync

	/* Fast sleep workaround */
	li	r3,1
	li	r4,1
	bl	opal_rm_config_cpu_idle_state

	/* Clear Lock bit */
	li	r0,0
	lwsync
	stw	r0,0(r14)
	b	common_enter

enter_winkle:
	bl	save_sprs_to_stack

	IDLE_STATE_ENTER_SEQ(PPC_WINKLE)

/*
 * r3 - requested stop state
 */
power_enter_stop:
/*
 * Check if the requested state is a deep idle state.
 */
	LOAD_REG_ADDRBASE(r5,pnv_first_deep_stop_state)
	ld	r4,ADDROFF(pnv_first_deep_stop_state)(r5)
	cmpd	r3,r4
	bge	2f
	IDLE_STATE_ENTER_SEQ(PPC_STOP)
2:
/*
 * Entering deep idle state.
 * Clear thread bit in PACA_CORE_IDLE_STATE, save SPRs to
 * stack and enter stop
 */
	lbz     r7,PACA_THREAD_MASK(r13)
	ld      r14,PACA_CORE_IDLE_STATE_PTR(r13)

lwarx_loop_stop:
	lwarx   r15,0,r14
	andi.   r9,r15,PNV_CORE_IDLE_LOCK_BIT
	bnel    core_idle_lock_held
	andc    r15,r15,r7                      /* Clear thread bit */

	stwcx.  r15,0,r14
	bne-    lwarx_loop_stop
	isync

	bl	save_sprs_to_stack

	IDLE_STATE_ENTER_SEQ(PPC_STOP)

_GLOBAL(power7_idle)
	/* Now check if user or arch enabled NAP mode */
	LOAD_REG_ADDRBASE(r3,powersave_nap)
	lwz	r4,ADDROFF(powersave_nap)(r3)
	cmpwi	0,r4,0
	beqlr
	li	r3, 1
	/* fall through */

_GLOBAL(power7_nap)
	mr	r4,r3
	li	r3,PNV_THREAD_NAP
	LOAD_REG_ADDR(r5, pnv_enter_arch207_idle_mode)
	b	pnv_powersave_common
	/* No return */

_GLOBAL(power7_sleep)
	li	r3,PNV_THREAD_SLEEP
	li	r4,1
	LOAD_REG_ADDR(r5, pnv_enter_arch207_idle_mode)
	b	pnv_powersave_common
	/* No return */

_GLOBAL(power7_winkle)
	li	r3,PNV_THREAD_WINKLE
	li	r4,1
	LOAD_REG_ADDR(r5, pnv_enter_arch207_idle_mode)
	b	pnv_powersave_common
	/* No return */

#define CHECK_HMI_INTERRUPT						\
	mfspr	r0,SPRN_SRR1;						\
BEGIN_FTR_SECTION_NESTED(66);						\
	rlwinm	r0,r0,45-31,0xf;  /* extract wake reason field (P8) */	\
FTR_SECTION_ELSE_NESTED(66);						\
	rlwinm	r0,r0,45-31,0xe;  /* P7 wake reason field is 3 bits */	\
ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_ARCH_207S, 66);		\
	cmpwi	r0,0xa;			/* Hypervisor maintenance ? */	\
	bne	20f;							\
	/* Invoke opal call to handle hmi */				\
	ld	r2,PACATOC(r13);					\
	ld	r1,PACAR1(r13);						\
	std	r3,ORIG_GPR3(r1);	/* Save original r3 */		\
	li	r3,0;			/* NULL argument */		\
	bl	hmi_exception_realmode;					\
	nop;								\
	ld	r3,ORIG_GPR3(r1);	/* Restore original r3 */	\
20:	nop;


/*
 * r3 - requested stop state
 */
_GLOBAL(power9_idle_stop)
	LOAD_REG_IMMEDIATE(r4, PSSCR_HV_TEMPLATE)
	or	r4,r4,r3
	mtspr	SPRN_PSSCR, r4
	li	r4, 1
	LOAD_REG_ADDR(r5,power_enter_stop)
	b	pnv_powersave_common
	/* No return */
/*
 * Called from reset vector. Check whether we have woken up with
 * hypervisor state loss. If yes, restore hypervisor state and return
 * back to reset vector.
 *
 * r13 - Contents of HSPRG0
 * cr3 - set to gt if waking up with partial/complete hypervisor state loss
 */
_GLOBAL(pnv_restore_hyp_resource)
BEGIN_FTR_SECTION
	ld	r2,PACATOC(r13);
	/*
	 * POWER ISA 3. Use PSSCR to determine if we
	 * are waking up from deep idle state
	 */
	LOAD_REG_ADDRBASE(r5,pnv_first_deep_stop_state)
	ld	r4,ADDROFF(pnv_first_deep_stop_state)(r5)

	mfspr	r5,SPRN_PSSCR
	/*
	 * 0-3 bits correspond to Power-Saving Level Status
	 * which indicates the idle state we are waking up from
	 */
	rldicl  r5,r5,4,60
	cmpd	cr4,r5,r4
	bge	cr4,pnv_wakeup_tb_loss
	/*
	 * Waking up without hypervisor state loss. Return to
	 * reset vector
	 */
	blr

END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)

	/*
	 * POWER ISA 2.07 or less.
	 * Check if last bit of HSPGR0 is set. This indicates whether we are
	 * waking up from winkle.
	 */
	clrldi	r5,r13,63
	clrrdi	r13,r13,1

	/* Now that we are sure r13 is corrected, load TOC */
	ld	r2,PACATOC(r13);
	cmpwi	cr4,r5,1
	mtspr	SPRN_HSPRG0,r13

	lbz	r0,PACA_THREAD_IDLE_STATE(r13)
	cmpwi   cr2,r0,PNV_THREAD_NAP
	bgt     cr2,pnv_wakeup_tb_loss	/* Either sleep or Winkle */

	/*
	 * We fall through here if PACA_THREAD_IDLE_STATE shows we are waking
	 * up from nap. At this stage CR3 shouldn't contains 'gt' since that
	 * indicates we are waking with hypervisor state loss from nap.
	 */
	bgt	cr3,.

	blr	/* Return back to System Reset vector from where
		   pnv_restore_hyp_resource was invoked */

/*
 * Called if waking up from idle state which can cause either partial or
 * complete hyp state loss.
 * In POWER8, called if waking up from fastsleep or winkle
 * In POWER9, called if waking up from stop state >= pnv_first_deep_stop_state
 *
 * r13 - PACA
 * cr3 - gt if waking up with partial/complete hypervisor state loss
 * cr4 - eq if waking up from complete hypervisor state loss.
 */
_GLOBAL(pnv_wakeup_tb_loss)
	ld	r1,PACAR1(r13)
	/*
	 * Before entering any idle state, the NVGPRs are saved in the stack
	 * and they are restored before switching to the process context. Hence
	 * until they are restored, they are free to be used.
	 *
	 * Save SRR1 and LR in NVGPRs as they might be clobbered in
	 * opal_call() (called in CHECK_HMI_INTERRUPT). SRR1 is required
	 * to determine the wakeup reason if we branch to kvm_start_guest. LR
	 * is required to return back to reset vector after hypervisor state
	 * restore is complete.
	 */
	mflr	r17
	mfspr	r16,SPRN_SRR1
BEGIN_FTR_SECTION
	CHECK_HMI_INTERRUPT
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)

	lbz	r7,PACA_THREAD_MASK(r13)
	ld	r14,PACA_CORE_IDLE_STATE_PTR(r13)
lwarx_loop2:
	lwarx	r15,0,r14
	andi.	r9,r15,PNV_CORE_IDLE_LOCK_BIT
	/*
	 * Lock bit is set in one of the 2 cases-
	 * a. In the sleep/winkle enter path, the last thread is executing
	 * fastsleep workaround code.
	 * b. In the wake up path, another thread is executing fastsleep
	 * workaround undo code or resyncing timebase or restoring context
	 * In either case loop until the lock bit is cleared.
	 */
	bnel	core_idle_lock_held

	cmpwi	cr2,r15,0

	/*
	 * At this stage
	 * cr2 - eq if first thread to wakeup in core
	 * cr3-  gt if waking up with partial/complete hypervisor state loss
	 * cr4 - eq if waking up from complete hypervisor state loss.
	 */

	ori	r15,r15,PNV_CORE_IDLE_LOCK_BIT
	stwcx.	r15,0,r14
	bne-	lwarx_loop2
	isync

BEGIN_FTR_SECTION
	lbz	r4,PACA_SUBCORE_SIBLING_MASK(r13)
	and	r4,r4,r15
	cmpwi	r4,0	/* Check if first in subcore */

	or	r15,r15,r7		/* Set thread bit */
	beq	first_thread_in_subcore
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)

	or	r15,r15,r7		/* Set thread bit */
	beq	cr2,first_thread_in_core

	/* Not first thread in core or subcore to wake up */
	b	clear_lock

first_thread_in_subcore:
	/*
	 * If waking up from sleep, subcore state is not lost. Hence
	 * skip subcore state restore
	 */
	bne	cr4,subcore_state_restored

	/* Restore per-subcore state */
	ld      r4,_SDR1(r1)
	mtspr   SPRN_SDR1,r4

	ld      r4,_RPR(r1)
	mtspr   SPRN_RPR,r4
	ld	r4,_AMOR(r1)
	mtspr	SPRN_AMOR,r4

subcore_state_restored:
	/*
	 * Check if the thread is also the first thread in the core. If not,
	 * skip to clear_lock.
	 */
	bne	cr2,clear_lock

first_thread_in_core:

	/*
	 * First thread in the core waking up from any state which can cause
	 * partial or complete hypervisor state loss. It needs to
	 * call the fastsleep workaround code if the platform requires it.
	 * Call it unconditionally here. The below branch instruction will
	 * be patched out if the platform does not have fastsleep or does not
	 * require the workaround. Patching will be performed during the
	 * discovery of idle-states.
	 */
.global pnv_fastsleep_workaround_at_exit
pnv_fastsleep_workaround_at_exit:
	b	fastsleep_workaround_at_exit

timebase_resync:
	/*
	 * Use cr3 which indicates that we are waking up with atleast partial
	 * hypervisor state loss to determine if TIMEBASE RESYNC is needed.
	 */
	ble	cr3,clear_lock
	/* Time base re-sync */
	bl	opal_rm_resync_timebase;
	/*
	 * If waking up from sleep, per core state is not lost, skip to
	 * clear_lock.
	 */
	bne	cr4,clear_lock

	/*
	 * First thread in the core to wake up and its waking up with
	 * complete hypervisor state loss. Restore per core hypervisor
	 * state.
	 */
BEGIN_FTR_SECTION
	ld	r4,_PTCR(r1)
	mtspr	SPRN_PTCR,r4
	ld	r4,_RPR(r1)
	mtspr	SPRN_RPR,r4
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)

	ld	r4,_TSCR(r1)
	mtspr	SPRN_TSCR,r4
	ld	r4,_WORC(r1)
	mtspr	SPRN_WORC,r4

clear_lock:
	andi.	r15,r15,PNV_CORE_IDLE_THREAD_BITS
	lwsync
	stw	r15,0(r14)

common_exit:
	/*
	 * Common to all threads.
	 *
	 * If waking up from sleep, hypervisor state is not lost. Hence
	 * skip hypervisor state restore.
	 */
	bne	cr4,hypervisor_state_restored

	/* Waking up from winkle */

BEGIN_MMU_FTR_SECTION
	b	no_segments
END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_RADIX)
	/* Restore SLB  from PACA */
	ld	r8,PACA_SLBSHADOWPTR(r13)

	.rept	SLB_NUM_BOLTED
	li	r3, SLBSHADOW_SAVEAREA
	LDX_BE	r5, r8, r3
	addi	r3, r3, 8
	LDX_BE	r6, r8, r3
	andis.	r7,r5,SLB_ESID_V@h
	beq	1f
	slbmte	r6,r5
1:	addi	r8,r8,16
	.endr
no_segments:

	/* Restore per thread state */

	ld	r4,_SPURR(r1)
	mtspr	SPRN_SPURR,r4
	ld	r4,_PURR(r1)
	mtspr	SPRN_PURR,r4
	ld	r4,_DSCR(r1)
	mtspr	SPRN_DSCR,r4
	ld	r4,_WORT(r1)
	mtspr	SPRN_WORT,r4

	/* Call cur_cpu_spec->cpu_restore() */
	LOAD_REG_ADDR(r4, cur_cpu_spec)
	ld	r4,0(r4)
	ld	r12,CPU_SPEC_RESTORE(r4)
#ifdef PPC64_ELF_ABI_v1
	ld	r12,0(r12)
#endif
	mtctr	r12
	bctrl

hypervisor_state_restored:

	mtspr	SPRN_SRR1,r16
	mtlr	r17
	blr	/* Return back to System Reset vector from where
		   pnv_restore_hyp_resource was invoked */

fastsleep_workaround_at_exit:
	li	r3,1
	li	r4,0
	bl	opal_rm_config_cpu_idle_state
	b	timebase_resync

/*
 * R3 here contains the value that will be returned to the caller
 * of power7_nap.
 */
_GLOBAL(pnv_wakeup_loss)
	ld	r1,PACAR1(r13)
BEGIN_FTR_SECTION
	CHECK_HMI_INTERRUPT
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
	REST_NVGPRS(r1)
	REST_GPR(2, r1)
	ld	r6,_CCR(r1)
	ld	r4,_MSR(r1)
	ld	r5,_NIP(r1)
	addi	r1,r1,INT_FRAME_SIZE
	mtcr	r6
	mtspr	SPRN_SRR1,r4
	mtspr	SPRN_SRR0,r5
	rfid

/*
 * R3 here contains the value that will be returned to the caller
 * of power7_nap.
 */
_GLOBAL(pnv_wakeup_noloss)
	lbz	r0,PACA_NAPSTATELOST(r13)
	cmpwi	r0,0
	bne	pnv_wakeup_loss
BEGIN_FTR_SECTION
	CHECK_HMI_INTERRUPT
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
	ld	r1,PACAR1(r13)
	ld	r6,_CCR(r1)
	ld	r4,_MSR(r1)
	ld	r5,_NIP(r1)
	addi	r1,r1,INT_FRAME_SIZE
	mtcr	r6
	mtspr	SPRN_SRR1,r4
	mtspr	SPRN_SRR0,r5
	rfid
OpenPOWER on IntegriCloud