summaryrefslogtreecommitdiff
path: root/arch/ia64/kernel/mca_asm.S
blob: 8bc7d259e0c646313c56e8ac6ee22a8319b81370 (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
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
/*
 * File:	mca_asm.S
 * Purpose:	assembly portion of the IA64 MCA handling
 *
 * Mods by cfleck to integrate into kernel build
 *
 * 2000-03-15 David Mosberger-Tang <davidm@hpl.hp.com>
 *		Added various stop bits to get a clean compile
 *
 * 2000-03-29 Chuck Fleckenstein <cfleck@co.intel.com>
 *		Added code to save INIT handoff state in pt_regs format,
 *		switch to temp kstack, switch modes, jump to C INIT handler
 *
 * 2002-01-04 J.Hall <jenna.s.hall@intel.com>
 *		Before entering virtual mode code:
 *		 1. Check for TLB CPU error
 *		 2. Restore current thread pointer to kr6
 *		 3. Move stack ptr 16 bytes to conform to C calling convention
 *
 * 2004-11-12 Russ Anderson <rja@sgi.com>
 *		Added per cpu MCA/INIT stack save areas.
 *
 * 2005-12-08 Keith Owens <kaos@sgi.com>
 *		Use per cpu MCA/INIT stacks for all data.
 */
#include <linux/threads.h>

#include <asm/asmmacro.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/mca_asm.h>
#include <asm/mca.h>

#include "entry.h"

#define GET_IA64_MCA_DATA(reg)						\
	GET_THIS_PADDR(reg, ia64_mca_data)				\
	;;								\
	ld8 reg=[reg]

	.global ia64_do_tlb_purge
	.global ia64_os_mca_dispatch
	.global ia64_os_init_dispatch_monarch
	.global ia64_os_init_dispatch_slave

	.text
	.align 16

//StartMain////////////////////////////////////////////////////////////////////

/*
 * Just the TLB purge part is moved to a separate function
 * so we can re-use the code for cpu hotplug code as well
 * Caller should now setup b1, so we can branch once the
 * tlb flush is complete.
 */

ia64_do_tlb_purge:
#define O(member)	IA64_CPUINFO_##member##_OFFSET

	GET_THIS_PADDR(r2, cpu_info)	// load phys addr of cpu_info into r2
	;;
	addl r17=O(PTCE_STRIDE),r2
	addl r2=O(PTCE_BASE),r2
	;;
	ld8 r18=[r2],(O(PTCE_COUNT)-O(PTCE_BASE));;	// r18=ptce_base
	ld4 r19=[r2],4					// r19=ptce_count[0]
	ld4 r21=[r17],4					// r21=ptce_stride[0]
	;;
	ld4 r20=[r2]					// r20=ptce_count[1]
	ld4 r22=[r17]					// r22=ptce_stride[1]
	mov r24=0
	;;
	adds r20=-1,r20
	;;
#undef O

2:
	cmp.ltu p6,p7=r24,r19
(p7)	br.cond.dpnt.few 4f
	mov ar.lc=r20
3:
	ptc.e r18
	;;
	add r18=r22,r18
	br.cloop.sptk.few 3b
	;;
	add r18=r21,r18
	add r24=1,r24
	;;
	br.sptk.few 2b
4:
	srlz.i 			// srlz.i implies srlz.d
	;;

        // Now purge addresses formerly mapped by TR registers
	// 1. Purge ITR&DTR for kernel.
	movl r16=KERNEL_START
	mov r18=KERNEL_TR_PAGE_SHIFT<<2
	;;
	ptr.i r16, r18
	ptr.d r16, r18
	;;
	srlz.i
	;;
	srlz.d
	;;
	// 3. Purge ITR for PAL code.
	GET_THIS_PADDR(r2, ia64_mca_pal_base)
	;;
	ld8 r16=[r2]
	mov r18=IA64_GRANULE_SHIFT<<2
	;;
	ptr.i r16,r18
	;;
	srlz.i
	;;
	// 4. Purge DTR for stack.
	mov r16=IA64_KR(CURRENT_STACK)
	;;
	shl r16=r16,IA64_GRANULE_SHIFT
	movl r19=PAGE_OFFSET
	;;
	add r16=r19,r16
	mov r18=IA64_GRANULE_SHIFT<<2
	;;
	ptr.d r16,r18
	;;
	srlz.i
	;;
	// Now branch away to caller.
	br.sptk.many b1
	;;

//EndMain//////////////////////////////////////////////////////////////////////

//StartMain////////////////////////////////////////////////////////////////////

ia64_os_mca_dispatch:
	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	mov r19=1				// All MCA events are treated as monarch (for now)
	br.sptk ia64_state_save			// save the state that is not in minstate
1:

	GET_IA64_MCA_DATA(r2)
	// Using MCA stack, struct ia64_sal_os_state, variable proc_state_param
	;;
	add r3=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET+SOS(PROC_STATE_PARAM), r2
	;;
	ld8 r18=[r3]				// Get processor state parameter on existing PALE_CHECK.
	;;
	tbit.nz p6,p7=r18,60
(p7)	br.spnt done_tlb_purge_and_reload

	// The following code purges TC and TR entries. Then reload all TC entries.
	// Purge percpu data TC entries.
begin_tlb_purge_and_reload:
	movl r18=ia64_reload_tr;;
	LOAD_PHYSICAL(p0,r18,ia64_reload_tr);;
	mov b1=r18;;
	br.sptk.many ia64_do_tlb_purge;;

ia64_reload_tr:
	// Finally reload the TR registers.
	// 1. Reload DTR/ITR registers for kernel.
	mov r18=KERNEL_TR_PAGE_SHIFT<<2
	movl r17=KERNEL_START
	;;
	mov cr.itir=r18
	mov cr.ifa=r17
        mov r16=IA64_TR_KERNEL
	mov r19=ip
	movl r18=PAGE_KERNEL
	;;
        dep r17=0,r19,0, KERNEL_TR_PAGE_SHIFT
	;;
	or r18=r17,r18
	;;
        itr.i itr[r16]=r18
	;;
        itr.d dtr[r16]=r18
        ;;
	srlz.i
	srlz.d
	;;
	// 3. Reload ITR for PAL code.
	GET_THIS_PADDR(r2, ia64_mca_pal_pte)
	;;
	ld8 r18=[r2]			// load PAL PTE
	;;
	GET_THIS_PADDR(r2, ia64_mca_pal_base)
	;;
	ld8 r16=[r2]			// load PAL vaddr
	mov r19=IA64_GRANULE_SHIFT<<2
	;;
	mov cr.itir=r19
	mov cr.ifa=r16
	mov r20=IA64_TR_PALCODE
	;;
	itr.i itr[r20]=r18
	;;
	srlz.i
	;;
	// 4. Reload DTR for stack.
	mov r16=IA64_KR(CURRENT_STACK)
	;;
	shl r16=r16,IA64_GRANULE_SHIFT
	movl r19=PAGE_OFFSET
	;;
	add r18=r19,r16
	movl r20=PAGE_KERNEL
	;;
	add r16=r20,r16
	mov r19=IA64_GRANULE_SHIFT<<2
	;;
	mov cr.itir=r19
	mov cr.ifa=r18
	mov r20=IA64_TR_CURRENT_STACK
	;;
	itr.d dtr[r20]=r16
	;;
	srlz.d

done_tlb_purge_and_reload:

	// switch to per cpu MCA stack
	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	br.sptk ia64_new_stack
1:

	// everything saved, now we can set the kernel registers
	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	br.sptk ia64_set_kernel_registers
1:

	// This must be done in physical mode
	GET_IA64_MCA_DATA(r2)
	;;
	mov r7=r2

        // Enter virtual mode from physical mode
	VIRTUAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_begin, r4)

	// This code returns to SAL via SOS r2, in general SAL has no unwind
	// data.  To get a clean termination when backtracing the C MCA/INIT
	// handler, set a dummy return address of 0 in this routine.  That
	// requires that ia64_os_mca_virtual_begin be a global function.
ENTRY(ia64_os_mca_virtual_begin)
	.prologue
	.save rp,r0
	.body

	mov ar.rsc=3				// set eager mode for C handler
	mov r2=r7				// see GET_IA64_MCA_DATA above
	;;

	// Call virtual mode handler
	alloc r14=ar.pfs,0,0,3,0
	;;
	DATA_PA_TO_VA(r2,r7)
	;;
	add out0=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
	add out1=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
	add out2=IA64_MCA_CPU_MCA_STACK_OFFSET+MCA_SOS_OFFSET, r2
	br.call.sptk.many    b0=ia64_mca_handler

	// Revert back to physical mode before going back to SAL
	PHYSICAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_end, r4)
ia64_os_mca_virtual_end:

END(ia64_os_mca_virtual_begin)

	// switch back to previous stack
	alloc r14=ar.pfs,0,0,0,0		// remove the MCA handler frame
	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	br.sptk ia64_old_stack
1:

	mov r3=IA64_MCA_CPU_MCA_STACK_OFFSET	// use the MCA stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	br.sptk ia64_state_restore		// restore the SAL state
1:

	mov		b0=r12			// SAL_CHECK return address

	br		b0

//EndMain//////////////////////////////////////////////////////////////////////

//StartMain////////////////////////////////////////////////////////////////////

//
// SAL to OS entry point for INIT on all processors.  This has been defined for
// registration purposes with SAL as a part of ia64_mca_init.  Monarch and
// slave INIT have identical processing, except for the value of the
// sos->monarch flag in r19.
//

ia64_os_init_dispatch_monarch:
	mov r19=1				// Bow, bow, ye lower middle classes!
	br.sptk ia64_os_init_dispatch

ia64_os_init_dispatch_slave:
	mov r19=0				// <igor>yeth, mathter</igor>

ia64_os_init_dispatch:

	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	br.sptk ia64_state_save			// save the state that is not in minstate
1:

	// switch to per cpu INIT stack
	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	br.sptk ia64_new_stack
1:

	// everything saved, now we can set the kernel registers
	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	br.sptk ia64_set_kernel_registers
1:

	// This must be done in physical mode
	GET_IA64_MCA_DATA(r2)
	;;
	mov r7=r2

        // Enter virtual mode from physical mode
	VIRTUAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_begin, r4)

	// This code returns to SAL via SOS r2, in general SAL has no unwind
	// data.  To get a clean termination when backtracing the C MCA/INIT
	// handler, set a dummy return address of 0 in this routine.  That
	// requires that ia64_os_init_virtual_begin be a global function.
ENTRY(ia64_os_init_virtual_begin)
	.prologue
	.save rp,r0
	.body

	mov ar.rsc=3				// set eager mode for C handler
	mov r2=r7				// see GET_IA64_MCA_DATA above
	;;

	// Call virtual mode handler
	alloc r14=ar.pfs,0,0,3,0
	;;
	DATA_PA_TO_VA(r2,r7)
	;;
	add out0=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_PT_REGS_OFFSET, r2
	add out1=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SWITCH_STACK_OFFSET, r2
	add out2=IA64_MCA_CPU_INIT_STACK_OFFSET+MCA_SOS_OFFSET, r2
	br.call.sptk.many    b0=ia64_init_handler

	// Revert back to physical mode before going back to SAL
	PHYSICAL_MODE_ENTER(r2, r3, ia64_os_init_virtual_end, r4)
ia64_os_init_virtual_end:

END(ia64_os_init_virtual_begin)

	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	br.sptk ia64_state_restore		// restore the SAL state
1:

	// switch back to previous stack
	alloc r14=ar.pfs,0,0,0,0		// remove the INIT handler frame
	mov r3=IA64_MCA_CPU_INIT_STACK_OFFSET	// use the INIT stack
	LOAD_PHYSICAL(p0,r2,1f)			// return address
	br.sptk ia64_old_stack
1:

	mov		b0=r12			// SAL_CHECK return address
	br		b0

//EndMain//////////////////////////////////////////////////////////////////////

// common defines for the stubs
#define	ms		r4
#define	regs		r5
#define	temp1		r2	/* careful, it overlaps with input registers */
#define	temp2		r3	/* careful, it overlaps with input registers */
#define	temp3		r7
#define	temp4		r14


//++
// Name:
//	ia64_state_save()
//
// Stub Description:
//
//	Save the state that is not in minstate.  This is sensitive to the layout of
//	struct ia64_sal_os_state in mca.h.
//
//	r2 contains the return address, r3 contains either
//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
//	The OS to SAL section of struct ia64_sal_os_state is set to a default
//	value of cold boot (MCA) or warm boot (INIT) and return to the same
//	context.  ia64_sal_os_state is also used to hold some registers that
//	need to be saved and restored across the stack switches.
//
//	Most input registers to this stub come from PAL/SAL
//	r1  os gp, physical
//	r8  pal_proc entry point
//	r9  sal_proc entry point
//	r10 sal gp
//	r11 MCA - rendevzous state, INIT - reason code
//	r12 sal return address
//	r17 pal min_state
//	r18 processor state parameter
//	r19 monarch flag, set by the caller of this routine
//
//	In addition to the SAL to OS state, this routine saves all the
//	registers that appear in struct pt_regs and struct switch_stack,
//	excluding those that are already in the PAL minstate area.  This
//	results in a partial pt_regs and switch_stack, the C code copies the
//	remaining registers from PAL minstate to pt_regs and switch_stack.  The
//	resulting structures contain all the state of the original process when
//	MCA/INIT occurred.
//
//--

ia64_state_save:
	add regs=MCA_SOS_OFFSET, r3
	add ms=MCA_SOS_OFFSET+8, r3
	mov b0=r2		// save return address
	cmp.eq p1,p2=IA64_MCA_CPU_MCA_STACK_OFFSET, r3
	;;
	GET_IA64_MCA_DATA(temp2)
	;;
	add temp1=temp2, regs	// struct ia64_sal_os_state on MCA or INIT stack
	add temp2=temp2, ms	// struct ia64_sal_os_state+8 on MCA or INIT stack
	;;
	mov regs=temp1		// save the start of sos
	st8 [temp1]=r1,16	// os_gp
	st8 [temp2]=r8,16	// pal_proc
	;;
	st8 [temp1]=r9,16	// sal_proc
	st8 [temp2]=r11,16	// rv_rc
	mov r11=cr.iipa
	;;
	st8 [temp1]=r18		// proc_state_param
	st8 [temp2]=r19		// monarch
	mov r6=IA64_KR(CURRENT)
	add temp1=SOS(SAL_RA), regs
	add temp2=SOS(SAL_GP), regs
	;;
	st8 [temp1]=r12,16	// sal_ra
	st8 [temp2]=r10,16	// sal_gp
	mov r12=cr.isr
	;;
	st8 [temp1]=r17,16	// pal_min_state
	st8 [temp2]=r6,16	// prev_IA64_KR_CURRENT
	mov r6=IA64_KR(CURRENT_STACK)
	;;
	st8 [temp1]=r6,16	// prev_IA64_KR_CURRENT_STACK
	st8 [temp2]=r0,16	// prev_task, starts off as NULL
	mov r6=cr.ifa
	;;
	st8 [temp1]=r12,16	// cr.isr
	st8 [temp2]=r6,16	// cr.ifa
	mov r12=cr.itir
	;;
	st8 [temp1]=r12,16	// cr.itir
	st8 [temp2]=r11,16	// cr.iipa
	mov r12=cr.iim
	;;
	st8 [temp1]=r12		// cr.iim
(p1)	mov r12=IA64_MCA_COLD_BOOT
(p2)	mov r12=IA64_INIT_WARM_BOOT
	mov r6=cr.iha
	add temp1=SOS(OS_STATUS), regs
	;;
	st8 [temp2]=r6		// cr.iha
	add temp2=SOS(CONTEXT), regs
	st8 [temp1]=r12		// os_status, default is cold boot
	mov r6=IA64_MCA_SAME_CONTEXT
	;;
	st8 [temp2]=r6		// context, default is same context

	// Save the pt_regs data that is not in minstate.  The previous code
	// left regs at sos.
	add regs=MCA_PT_REGS_OFFSET-MCA_SOS_OFFSET, regs
	;;
	add temp1=PT(B6), regs
	mov temp3=b6
	mov temp4=b7
	add temp2=PT(B7), regs
	;;
	st8 [temp1]=temp3,PT(AR_CSD)-PT(B6)		// save b6
	st8 [temp2]=temp4,PT(AR_SSD)-PT(B7)		// save b7
	mov temp3=ar.csd
	mov temp4=ar.ssd
	cover						// must be last in group
	;;
	st8 [temp1]=temp3,PT(AR_UNAT)-PT(AR_CSD)	// save ar.csd
	st8 [temp2]=temp4,PT(AR_PFS)-PT(AR_SSD)		// save ar.ssd
	mov temp3=ar.unat
	mov temp4=ar.pfs
	;;
	st8 [temp1]=temp3,PT(AR_RNAT)-PT(AR_UNAT)	// save ar.unat
	st8 [temp2]=temp4,PT(AR_BSPSTORE)-PT(AR_PFS)	// save ar.pfs
	mov temp3=ar.rnat
	mov temp4=ar.bspstore
	;;
	st8 [temp1]=temp3,PT(LOADRS)-PT(AR_RNAT)	// save ar.rnat
	st8 [temp2]=temp4,PT(AR_FPSR)-PT(AR_BSPSTORE)	// save ar.bspstore
	mov temp3=ar.bsp
	;;
	sub temp3=temp3, temp4	// ar.bsp - ar.bspstore
	mov temp4=ar.fpsr
	;;
	shl temp3=temp3,16	// compute ar.rsc to be used for "loadrs"
	;;
	st8 [temp1]=temp3,PT(AR_CCV)-PT(LOADRS)		// save loadrs
	st8 [temp2]=temp4,PT(F6)-PT(AR_FPSR)		// save ar.fpsr
	mov temp3=ar.ccv
	;;
	st8 [temp1]=temp3,PT(F7)-PT(AR_CCV)		// save ar.ccv
	stf.spill [temp2]=f6,PT(F8)-PT(F6)
	;;
	stf.spill [temp1]=f7,PT(F9)-PT(F7)
	stf.spill [temp2]=f8,PT(F10)-PT(F8)
	;;
	stf.spill [temp1]=f9,PT(F11)-PT(F9)
	stf.spill [temp2]=f10
	;;
	stf.spill [temp1]=f11

	// Save the switch_stack data that is not in minstate nor pt_regs.  The
	// previous code left regs at pt_regs.
	add regs=MCA_SWITCH_STACK_OFFSET-MCA_PT_REGS_OFFSET, regs
	;;
	add temp1=SW(F2), regs
	add temp2=SW(F3), regs
	;;
	stf.spill [temp1]=f2,32
	stf.spill [temp2]=f3,32
	;;
	stf.spill [temp1]=f4,32
	stf.spill [temp2]=f5,32
	;;
	stf.spill [temp1]=f12,32
	stf.spill [temp2]=f13,32
	;;
	stf.spill [temp1]=f14,32
	stf.spill [temp2]=f15,32
	;;
	stf.spill [temp1]=f16,32
	stf.spill [temp2]=f17,32
	;;
	stf.spill [temp1]=f18,32
	stf.spill [temp2]=f19,32
	;;
	stf.spill [temp1]=f20,32
	stf.spill [temp2]=f21,32
	;;
	stf.spill [temp1]=f22,32
	stf.spill [temp2]=f23,32
	;;
	stf.spill [temp1]=f24,32
	stf.spill [temp2]=f25,32
	;;
	stf.spill [temp1]=f26,32
	stf.spill [temp2]=f27,32
	;;
	stf.spill [temp1]=f28,32
	stf.spill [temp2]=f29,32
	;;
	stf.spill [temp1]=f30,SW(B2)-SW(F30)
	stf.spill [temp2]=f31,SW(B3)-SW(F31)
	mov temp3=b2
	mov temp4=b3
	;;
	st8 [temp1]=temp3,16	// save b2
	st8 [temp2]=temp4,16	// save b3
	mov temp3=b4
	mov temp4=b5
	;;
	st8 [temp1]=temp3,SW(AR_LC)-SW(B4)	// save b4
	st8 [temp2]=temp4	// save b5
	mov temp3=ar.lc
	;;
	st8 [temp1]=temp3	// save ar.lc

	// FIXME: Some proms are incorrectly accessing the minstate area as
	// cached data.  The C code uses region 6, uncached virtual.  Ensure
	// that there is no cache data lying around for the first 1K of the
	// minstate area.
	// Remove this code in September 2006, that gives platforms a year to
	// fix their proms and get their customers updated.

	add r1=32*1,r17
	add r2=32*2,r17
	add r3=32*3,r17
	add r4=32*4,r17
	add r5=32*5,r17
	add r6=32*6,r17
	add r7=32*7,r17
	;;
	fc r17
	fc r1
	fc r2
	fc r3
	fc r4
	fc r5
	fc r6
	fc r7
	add r17=32*8,r17
	add r1=32*8,r1
	add r2=32*8,r2
	add r3=32*8,r3
	add r4=32*8,r4
	add r5=32*8,r5
	add r6=32*8,r6
	add r7=32*8,r7
	;;
	fc r17
	fc r1
	fc r2
	fc r3
	fc r4
	fc r5
	fc r6
	fc r7
	add r17=32*8,r17
	add r1=32*8,r1
	add r2=32*8,r2
	add r3=32*8,r3
	add r4=32*8,r4
	add r5=32*8,r5
	add r6=32*8,r6
	add r7=32*8,r7
	;;
	fc r17
	fc r1
	fc r2
	fc r3
	fc r4
	fc r5
	fc r6
	fc r7
	add r17=32*8,r17
	add r1=32*8,r1
	add r2=32*8,r2
	add r3=32*8,r3
	add r4=32*8,r4
	add r5=32*8,r5
	add r6=32*8,r6
	add r7=32*8,r7
	;;
	fc r17
	fc r1
	fc r2
	fc r3
	fc r4
	fc r5
	fc r6
	fc r7

	br.sptk b0

//EndStub//////////////////////////////////////////////////////////////////////


//++
// Name:
//	ia64_state_restore()
//
// Stub Description:
//
//	Restore the SAL/OS state.  This is sensitive to the layout of struct
//	ia64_sal_os_state in mca.h.
//
//	r2 contains the return address, r3 contains either
//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
//	In addition to the SAL to OS state, this routine restores all the
//	registers that appear in struct pt_regs and struct switch_stack,
//	excluding those in the PAL minstate area.
//
//--

ia64_state_restore:
	// Restore the switch_stack data that is not in minstate nor pt_regs.
	add regs=MCA_SWITCH_STACK_OFFSET, r3
	mov b0=r2		// save return address
	;;
	GET_IA64_MCA_DATA(temp2)
	;;
	add regs=temp2, regs
	;;
	add temp1=SW(F2), regs
	add temp2=SW(F3), regs
	;;
	ldf.fill f2=[temp1],32
	ldf.fill f3=[temp2],32
	;;
	ldf.fill f4=[temp1],32
	ldf.fill f5=[temp2],32
	;;
	ldf.fill f12=[temp1],32
	ldf.fill f13=[temp2],32
	;;
	ldf.fill f14=[temp1],32
	ldf.fill f15=[temp2],32
	;;
	ldf.fill f16=[temp1],32
	ldf.fill f17=[temp2],32
	;;
	ldf.fill f18=[temp1],32
	ldf.fill f19=[temp2],32
	;;
	ldf.fill f20=[temp1],32
	ldf.fill f21=[temp2],32
	;;
	ldf.fill f22=[temp1],32
	ldf.fill f23=[temp2],32
	;;
	ldf.fill f24=[temp1],32
	ldf.fill f25=[temp2],32
	;;
	ldf.fill f26=[temp1],32
	ldf.fill f27=[temp2],32
	;;
	ldf.fill f28=[temp1],32
	ldf.fill f29=[temp2],32
	;;
	ldf.fill f30=[temp1],SW(B2)-SW(F30)
	ldf.fill f31=[temp2],SW(B3)-SW(F31)
	;;
	ld8 temp3=[temp1],16	// restore b2
	ld8 temp4=[temp2],16	// restore b3
	;;
	mov b2=temp3
	mov b3=temp4
	ld8 temp3=[temp1],SW(AR_LC)-SW(B4)	// restore b4
	ld8 temp4=[temp2]	// restore b5
	;;
	mov b4=temp3
	mov b5=temp4
	ld8 temp3=[temp1]	// restore ar.lc
	;;
	mov ar.lc=temp3

	// Restore the pt_regs data that is not in minstate.  The previous code
	// left regs at switch_stack.
	add regs=MCA_PT_REGS_OFFSET-MCA_SWITCH_STACK_OFFSET, regs
	;;
	add temp1=PT(B6), regs
	add temp2=PT(B7), regs
	;;
	ld8 temp3=[temp1],PT(AR_CSD)-PT(B6)		// restore b6
	ld8 temp4=[temp2],PT(AR_SSD)-PT(B7)		// restore b7
	;;
	mov b6=temp3
	mov b7=temp4
	ld8 temp3=[temp1],PT(AR_UNAT)-PT(AR_CSD)	// restore ar.csd
	ld8 temp4=[temp2],PT(AR_PFS)-PT(AR_SSD)		// restore ar.ssd
	;;
	mov ar.csd=temp3
	mov ar.ssd=temp4
	ld8 temp3=[temp1]				// restore ar.unat
	add temp1=PT(AR_CCV)-PT(AR_UNAT), temp1
	ld8 temp4=[temp2],PT(AR_FPSR)-PT(AR_PFS)	// restore ar.pfs
	;;
	mov ar.unat=temp3
	mov ar.pfs=temp4
	// ar.rnat, ar.bspstore, loadrs are restore in ia64_old_stack.
	ld8 temp3=[temp1],PT(F6)-PT(AR_CCV)		// restore ar.ccv
	ld8 temp4=[temp2],PT(F7)-PT(AR_FPSR)		// restore ar.fpsr
	;;
	mov ar.ccv=temp3
	mov ar.fpsr=temp4
	ldf.fill f6=[temp1],PT(F8)-PT(F6)
	ldf.fill f7=[temp2],PT(F9)-PT(F7)
	;;
	ldf.fill f8=[temp1],PT(F10)-PT(F8)
	ldf.fill f9=[temp2],PT(F11)-PT(F9)
	;;
	ldf.fill f10=[temp1]
	ldf.fill f11=[temp2]

	// Restore the SAL to OS state. The previous code left regs at pt_regs.
	add regs=MCA_SOS_OFFSET-MCA_PT_REGS_OFFSET, regs
	;;
	add temp1=SOS(SAL_RA), regs
	add temp2=SOS(SAL_GP), regs
	;;
	ld8 r12=[temp1],16	// sal_ra
	ld8 r9=[temp2],16	// sal_gp
	;;
	ld8 r22=[temp1],16	// pal_min_state, virtual
	ld8 r13=[temp2],16	// prev_IA64_KR_CURRENT
	;;
	ld8 r16=[temp1],16	// prev_IA64_KR_CURRENT_STACK
	ld8 r20=[temp2],16	// prev_task
	;;
	ld8 temp3=[temp1],16	// cr.isr
	ld8 temp4=[temp2],16	// cr.ifa
	;;
	mov cr.isr=temp3
	mov cr.ifa=temp4
	ld8 temp3=[temp1],16	// cr.itir
	ld8 temp4=[temp2],16	// cr.iipa
	;;
	mov cr.itir=temp3
	mov cr.iipa=temp4
	ld8 temp3=[temp1]	// cr.iim
	ld8 temp4=[temp2]		// cr.iha
	add temp1=SOS(OS_STATUS), regs
	add temp2=SOS(CONTEXT), regs
	;;
	mov cr.iim=temp3
	mov cr.iha=temp4
	dep r22=0,r22,62,1	// pal_min_state, physical, uncached
	mov IA64_KR(CURRENT)=r13
	ld8 r8=[temp1]		// os_status
	ld8 r10=[temp2]		// context

	/* Wire IA64_TR_CURRENT_STACK to the stack that we are resuming to.  To
	 * avoid any dependencies on the algorithm in ia64_switch_to(), just
	 * purge any existing CURRENT_STACK mapping and insert the new one.
	 *
	 * r16 contains prev_IA64_KR_CURRENT_STACK, r13 contains
	 * prev_IA64_KR_CURRENT, these values may have been changed by the C
	 * code.  Do not use r8, r9, r10, r22, they contain values ready for
	 * the return to SAL.
	 */

	mov r15=IA64_KR(CURRENT_STACK)		// physical granule mapped by IA64_TR_CURRENT_STACK
	;;
	shl r15=r15,IA64_GRANULE_SHIFT
	;;
	dep r15=-1,r15,61,3			// virtual granule
	mov r18=IA64_GRANULE_SHIFT<<2		// for cr.itir.ps
	;;
	ptr.d r15,r18
	;;
	srlz.d

	extr.u r19=r13,61,3			// r13 = prev_IA64_KR_CURRENT
	shl r20=r16,IA64_GRANULE_SHIFT		// r16 = prev_IA64_KR_CURRENT_STACK
	movl r21=PAGE_KERNEL			// page properties
	;;
	mov IA64_KR(CURRENT_STACK)=r16
	cmp.ne p6,p0=RGN_KERNEL,r19		// new stack is in the kernel region?
	or r21=r20,r21				// construct PA | page properties
(p6)	br.spnt 1f				// the dreaded cpu 0 idle task in region 5:(
	;;
	mov cr.itir=r18
	mov cr.ifa=r13
	mov r20=IA64_TR_CURRENT_STACK
	;;
	itr.d dtr[r20]=r21
	;;
	srlz.d
1:

	br.sptk b0

//EndStub//////////////////////////////////////////////////////////////////////


//++
// Name:
//	ia64_new_stack()
//
// Stub Description:
//
//	Switch to the MCA/INIT stack.
//
//	r2 contains the return address, r3 contains either
//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
//	On entry RBS is still on the original stack, this routine switches RBS
//	to use the MCA/INIT stack.
//
//	On entry, sos->pal_min_state is physical, on exit it is virtual.
//
//--

ia64_new_stack:
	add regs=MCA_PT_REGS_OFFSET, r3
	add temp2=MCA_SOS_OFFSET+SOS(PAL_MIN_STATE), r3
	mov b0=r2			// save return address
	GET_IA64_MCA_DATA(temp1)
	invala
	;;
	add temp2=temp2, temp1		// struct ia64_sal_os_state.pal_min_state on MCA or INIT stack
	add regs=regs, temp1		// struct pt_regs on MCA or INIT stack
	;;
	// Address of minstate area provided by PAL is physical, uncacheable.
	// Convert to Linux virtual address in region 6 for C code.
	ld8 ms=[temp2]			// pal_min_state, physical
	;;
	dep temp1=-1,ms,62,2		// set region 6
	mov temp3=IA64_RBS_OFFSET-MCA_PT_REGS_OFFSET
	;;
	st8 [temp2]=temp1		// pal_min_state, virtual

	add temp4=temp3, regs		// start of bspstore on new stack
	;;
	mov ar.bspstore=temp4		// switch RBS to MCA/INIT stack
	;;
	flushrs				// must be first in group
	br.sptk b0

//EndStub//////////////////////////////////////////////////////////////////////


//++
// Name:
//	ia64_old_stack()
//
// Stub Description:
//
//	Switch to the old stack.
//
//	r2 contains the return address, r3 contains either
//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
//	On entry, pal_min_state is virtual, on exit it is physical.
//
//	On entry RBS is on the MCA/INIT stack, this routine switches RBS
//	back to the previous stack.
//
//	The psr is set to all zeroes.  SAL return requires either all zeroes or
//	just psr.mc set.  Leaving psr.mc off allows INIT to be issued if this
//	code does not perform correctly.
//
//	The dirty registers at the time of the event were flushed to the
//	MCA/INIT stack in ia64_pt_regs_save().  Restore the dirty registers
//	before reverting to the previous bspstore.
//--

ia64_old_stack:
	add regs=MCA_PT_REGS_OFFSET, r3
	mov b0=r2			// save return address
	GET_IA64_MCA_DATA(temp2)
	LOAD_PHYSICAL(p0,temp1,1f)
	;;
	mov cr.ipsr=r0
	mov cr.ifs=r0
	mov cr.iip=temp1
	;;
	invala
	rfi
1:

	add regs=regs, temp2		// struct pt_regs on MCA or INIT stack
	;;
	add temp1=PT(LOADRS), regs
	;;
	ld8 temp2=[temp1],PT(AR_BSPSTORE)-PT(LOADRS)	// restore loadrs
	;;
	ld8 temp3=[temp1],PT(AR_RNAT)-PT(AR_BSPSTORE)	// restore ar.bspstore
	mov ar.rsc=temp2
	;;
	loadrs
	ld8 temp4=[temp1]		// restore ar.rnat
	;;
	mov ar.bspstore=temp3		// back to old stack
	;;
	mov ar.rnat=temp4
	;;

	br.sptk b0

//EndStub//////////////////////////////////////////////////////////////////////


//++
// Name:
//	ia64_set_kernel_registers()
//
// Stub Description:
//
//	Set the registers that are required by the C code in order to run on an
//	MCA/INIT stack.
//
//	r2 contains the return address, r3 contains either
//	IA64_MCA_CPU_MCA_STACK_OFFSET or IA64_MCA_CPU_INIT_STACK_OFFSET.
//
//--

ia64_set_kernel_registers:
	add temp3=MCA_SP_OFFSET, r3
	mov b0=r2		// save return address
	GET_IA64_MCA_DATA(temp1)
	;;
	add r12=temp1, temp3	// kernel stack pointer on MCA/INIT stack
	add r13=temp1, r3	// set current to start of MCA/INIT stack
	add r20=temp1, r3	// physical start of MCA/INIT stack
	;;
	DATA_PA_TO_VA(r12,temp2)
	DATA_PA_TO_VA(r13,temp3)
	;;
	mov IA64_KR(CURRENT)=r13

	/* Wire IA64_TR_CURRENT_STACK to the MCA/INIT handler stack.  To avoid
	 * any dependencies on the algorithm in ia64_switch_to(), just purge
	 * any existing CURRENT_STACK mapping and insert the new one.
	 */

	mov r16=IA64_KR(CURRENT_STACK)		// physical granule mapped by IA64_TR_CURRENT_STACK
	;;
	shl r16=r16,IA64_GRANULE_SHIFT
	;;
	dep r16=-1,r16,61,3			// virtual granule
	mov r18=IA64_GRANULE_SHIFT<<2		// for cr.itir.ps
	;;
	ptr.d r16,r18
	;;
	srlz.d

	shr.u r16=r20,IA64_GRANULE_SHIFT	// r20 = physical start of MCA/INIT stack
	movl r21=PAGE_KERNEL			// page properties
	;;
	mov IA64_KR(CURRENT_STACK)=r16
	or r21=r20,r21				// construct PA | page properties
	;;
	mov cr.itir=r18
	mov cr.ifa=r13
	mov r20=IA64_TR_CURRENT_STACK

	movl r17=FPSR_DEFAULT
	;;
	mov.m ar.fpsr=r17			// set ar.fpsr to kernel default value
	;;
	itr.d dtr[r20]=r21
	;;
	srlz.d

	br.sptk b0

//EndStub//////////////////////////////////////////////////////////////////////

#undef	ms
#undef	regs
#undef	temp1
#undef	temp2
#undef	temp3
#undef	temp4


// Support function for mca.c, it is here to avoid using inline asm.  Given the
// address of an rnat slot, if that address is below the current ar.bspstore
// then return the contents of that slot, otherwise return the contents of
// ar.rnat.
GLOBAL_ENTRY(ia64_get_rnat)
	alloc r14=ar.pfs,1,0,0,0
	mov ar.rsc=0
	;;
	mov r14=ar.bspstore
	;;
	cmp.lt p6,p7=in0,r14
	;;
(p6)	ld8 r8=[in0]
(p7)	mov r8=ar.rnat
	mov ar.rsc=3
	br.ret.sptk.many rp
END(ia64_get_rnat)