summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/misc_32.S
blob: 93cf7a5846a6f5875534cc43a2a3409357dc482a (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
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
/*
 * This file contains miscellaneous low-level functions.
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
 * and Paul Mackerras.
 *
 * kexec bits:
 * Copyright (C) 2002-2003 Eric Biederman  <ebiederm@xmission.com>
 * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
 * PPC44x port. Copyright (C) 2011,  IBM Corporation
 * 		Author: Suzuki Poulose <suzuki@in.ibm.com>
 *
 * 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/sys.h>
#include <asm/unistd.h>
#include <asm/errno.h>
#include <asm/reg.h>
#include <asm/page.h>
#include <asm/cache.h>
#include <asm/cputable.h>
#include <asm/mmu.h>
#include <asm/ppc_asm.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
#include <asm/processor.h>
#include <asm/kexec.h>
#include <asm/bug.h>
#include <asm/ptrace.h>
#include <asm/export.h>

	.text

/*
 * We store the saved ksp_limit in the unused part
 * of the STACK_FRAME_OVERHEAD
 */
_GLOBAL(call_do_softirq)
	mflr	r0
	stw	r0,4(r1)
	lwz	r10,THREAD+KSP_LIMIT(r2)
	addi	r11,r3,THREAD_INFO_GAP
	stwu	r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3)
	mr	r1,r3
	stw	r10,8(r1)
	stw	r11,THREAD+KSP_LIMIT(r2)
	bl	__do_softirq
	lwz	r10,8(r1)
	lwz	r1,0(r1)
	lwz	r0,4(r1)
	stw	r10,THREAD+KSP_LIMIT(r2)
	mtlr	r0
	blr

/*
 * void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp);
 */
_GLOBAL(call_do_irq)
	mflr	r0
	stw	r0,4(r1)
	lwz	r10,THREAD+KSP_LIMIT(r2)
	addi	r11,r4,THREAD_INFO_GAP
	stwu	r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4)
	mr	r1,r4
	stw	r10,8(r1)
	stw	r11,THREAD+KSP_LIMIT(r2)
	bl	__do_irq
	lwz	r10,8(r1)
	lwz	r1,0(r1)
	lwz	r0,4(r1)
	stw	r10,THREAD+KSP_LIMIT(r2)
	mtlr	r0
	blr

/*
 * This returns the high 64 bits of the product of two 64-bit numbers.
 */
_GLOBAL(mulhdu)
	cmpwi	r6,0
	cmpwi	cr1,r3,0
	mr	r10,r4
	mulhwu	r4,r4,r5
	beq	1f
	mulhwu	r0,r10,r6
	mullw	r7,r10,r5
	addc	r7,r0,r7
	addze	r4,r4
1:	beqlr	cr1		/* all done if high part of A is 0 */
	mullw	r9,r3,r5
	mulhwu	r10,r3,r5
	beq	2f
	mullw	r0,r3,r6
	mulhwu	r8,r3,r6
	addc	r7,r0,r7
	adde	r4,r4,r8
	addze	r10,r10
2:	addc	r4,r4,r9
	addze	r3,r10
	blr

/*
 * reloc_got2 runs through the .got2 section adding an offset
 * to each entry.
 */
_GLOBAL(reloc_got2)
	mflr	r11
	lis	r7,__got2_start@ha
	addi	r7,r7,__got2_start@l
	lis	r8,__got2_end@ha
	addi	r8,r8,__got2_end@l
	subf	r8,r7,r8
	srwi.	r8,r8,2
	beqlr
	mtctr	r8
	bl	1f
1:	mflr	r0
	lis	r4,1b@ha
	addi	r4,r4,1b@l
	subf	r0,r4,r0
	add	r7,r0,r7
2:	lwz	r0,0(r7)
	add	r0,r0,r3
	stw	r0,0(r7)
	addi	r7,r7,4
	bdnz	2b
	mtlr	r11
	blr

/*
 * call_setup_cpu - call the setup_cpu function for this cpu
 * r3 = data offset, r24 = cpu number
 *
 * Setup function is called with:
 *   r3 = data offset
 *   r4 = ptr to CPU spec (relocated)
 */
_GLOBAL(call_setup_cpu)
	addis	r4,r3,cur_cpu_spec@ha
	addi	r4,r4,cur_cpu_spec@l
	lwz	r4,0(r4)
	add	r4,r4,r3
	lwz	r5,CPU_SPEC_SETUP(r4)
	cmpwi	0,r5,0
	add	r5,r5,r3
	beqlr
	mtctr	r5
	bctr

#if defined(CONFIG_CPU_FREQ_PMAC) && defined(CONFIG_6xx)

/* This gets called by via-pmu.c to switch the PLL selection
 * on 750fx CPU. This function should really be moved to some
 * other place (as most of the cpufreq code in via-pmu
 */
_GLOBAL(low_choose_750fx_pll)
	/* Clear MSR:EE */
	mfmsr	r7
	rlwinm	r0,r7,0,17,15
	mtmsr	r0

	/* If switching to PLL1, disable HID0:BTIC */
	cmplwi	cr0,r3,0
	beq	1f
	mfspr	r5,SPRN_HID0
	rlwinm	r5,r5,0,27,25
	sync
	mtspr	SPRN_HID0,r5
	isync
	sync

1:
	/* Calc new HID1 value */
	mfspr	r4,SPRN_HID1	/* Build a HID1:PS bit from parameter */
	rlwinm	r5,r3,16,15,15	/* Clear out HID1:PS from value read */
	rlwinm	r4,r4,0,16,14	/* Could have I used rlwimi here ? */
	or	r4,r4,r5
	mtspr	SPRN_HID1,r4

	/* Store new HID1 image */
	CURRENT_THREAD_INFO(r6, r1)
	lwz	r6,TI_CPU(r6)
	slwi	r6,r6,2
	addis	r6,r6,nap_save_hid1@ha
	stw	r4,nap_save_hid1@l(r6)

	/* If switching to PLL0, enable HID0:BTIC */
	cmplwi	cr0,r3,0
	bne	1f
	mfspr	r5,SPRN_HID0
	ori	r5,r5,HID0_BTIC
	sync
	mtspr	SPRN_HID0,r5
	isync
	sync

1:
	/* Return */
	mtmsr	r7
	blr

_GLOBAL(low_choose_7447a_dfs)
	/* Clear MSR:EE */
	mfmsr	r7
	rlwinm	r0,r7,0,17,15
	mtmsr	r0
	
	/* Calc new HID1 value */
	mfspr	r4,SPRN_HID1
	insrwi	r4,r3,1,9	/* insert parameter into bit 9 */
	sync
	mtspr	SPRN_HID1,r4
	sync
	isync

	/* Return */
	mtmsr	r7
	blr

#endif /* CONFIG_CPU_FREQ_PMAC && CONFIG_6xx */

/*
 * complement mask on the msr then "or" some values on.
 *     _nmask_and_or_msr(nmask, value_to_or)
 */
_GLOBAL(_nmask_and_or_msr)
	mfmsr	r0		/* Get current msr */
	andc	r0,r0,r3	/* And off the bits set in r3 (first parm) */
	or	r0,r0,r4	/* Or on the bits in r4 (second parm) */
	SYNC			/* Some chip revs have problems here... */
	mtmsr	r0		/* Update machine state */
	isync
	blr			/* Done */

#ifdef CONFIG_40x

/*
 * Do an IO access in real mode
 */
_GLOBAL(real_readb)
	mfmsr	r7
	ori	r0,r7,MSR_DR
	xori	r0,r0,MSR_DR
	sync
	mtmsr	r0
	sync
	isync
	lbz	r3,0(r3)
	sync
	mtmsr	r7
	sync
	isync
	blr

	/*
 * Do an IO access in real mode
 */
_GLOBAL(real_writeb)
	mfmsr	r7
	ori	r0,r7,MSR_DR
	xori	r0,r0,MSR_DR
	sync
	mtmsr	r0
	sync
	isync
	stb	r3,0(r4)
	sync
	mtmsr	r7
	sync
	isync
	blr

#endif /* CONFIG_40x */


/*
 * Flush instruction cache.
 * This is a no-op on the 601.
 */
#ifndef CONFIG_PPC_8xx
_GLOBAL(flush_instruction_cache)
#if defined(CONFIG_4xx)
#ifdef CONFIG_403GCX
	li      r3, 512
	mtctr   r3
	lis     r4, KERNELBASE@h
1:	iccci   0, r4
	addi    r4, r4, 16
	bdnz    1b
#else
	lis	r3, KERNELBASE@h
	iccci	0,r3
#endif
#elif CONFIG_FSL_BOOKE
BEGIN_FTR_SECTION
	mfspr   r3,SPRN_L1CSR0
	ori     r3,r3,L1CSR0_CFI|L1CSR0_CLFC
	/* msync; isync recommended here */
	mtspr   SPRN_L1CSR0,r3
	isync
	blr
END_FTR_SECTION_IFSET(CPU_FTR_UNIFIED_ID_CACHE)
	mfspr	r3,SPRN_L1CSR1
	ori	r3,r3,L1CSR1_ICFI|L1CSR1_ICLFR
	mtspr	SPRN_L1CSR1,r3
#else
	mfspr	r3,SPRN_PVR
	rlwinm	r3,r3,16,16,31
	cmpwi	0,r3,1
	beqlr			/* for 601, do nothing */
	/* 603/604 processor - use invalidate-all bit in HID0 */
	mfspr	r3,SPRN_HID0
	ori	r3,r3,HID0_ICFI
	mtspr	SPRN_HID0,r3
#endif /* CONFIG_4xx */
	isync
	blr
EXPORT_SYMBOL(flush_instruction_cache)
#endif /* CONFIG_PPC_8xx */

/*
 * Write any modified data cache blocks out to memory
 * and invalidate the corresponding instruction cache blocks.
 * This is a no-op on the 601.
 *
 * flush_icache_range(unsigned long start, unsigned long stop)
 */
_GLOBAL(flush_icache_range)
BEGIN_FTR_SECTION
	PURGE_PREFETCHED_INS
	blr				/* for 601, do nothing */
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
	rlwinm	r3,r3,0,0,31 - L1_CACHE_SHIFT
	subf	r4,r3,r4
	addi	r4,r4,L1_CACHE_BYTES - 1
	srwi.	r4,r4,L1_CACHE_SHIFT
	beqlr
	mtctr	r4
	mr	r6,r3
1:	dcbst	0,r3
	addi	r3,r3,L1_CACHE_BYTES
	bdnz	1b
	sync				/* wait for dcbst's to get to ram */
#ifndef CONFIG_44x
	mtctr	r4
2:	icbi	0,r6
	addi	r6,r6,L1_CACHE_BYTES
	bdnz	2b
#else
	/* Flash invalidate on 44x because we are passed kmapped addresses and
	   this doesn't work for userspace pages due to the virtually tagged
	   icache.  Sigh. */
	iccci	0, r0
#endif
	sync				/* additional sync needed on g4 */
	isync
	blr
_ASM_NOKPROBE_SYMBOL(flush_icache_range)
EXPORT_SYMBOL(flush_icache_range)

/*
 * Flush a particular page from the data cache to RAM.
 * Note: this is necessary because the instruction cache does *not*
 * snoop from the data cache.
 * This is a no-op on the 601 which has a unified cache.
 *
 *	void __flush_dcache_icache(void *page)
 */
_GLOBAL(__flush_dcache_icache)
BEGIN_FTR_SECTION
	PURGE_PREFETCHED_INS
	blr
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
	rlwinm	r3,r3,0,0,31-PAGE_SHIFT		/* Get page base address */
	li	r4,PAGE_SIZE/L1_CACHE_BYTES	/* Number of lines in a page */
	mtctr	r4
	mr	r6,r3
0:	dcbst	0,r3				/* Write line to ram */
	addi	r3,r3,L1_CACHE_BYTES
	bdnz	0b
	sync
#ifdef CONFIG_44x
	/* We don't flush the icache on 44x. Those have a virtual icache
	 * and we don't have access to the virtual address here (it's
	 * not the page vaddr but where it's mapped in user space). The
	 * flushing of the icache on these is handled elsewhere, when
	 * a change in the address space occurs, before returning to
	 * user space
	 */
BEGIN_MMU_FTR_SECTION
	blr
END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_44x)
#endif /* CONFIG_44x */
	mtctr	r4
1:	icbi	0,r6
	addi	r6,r6,L1_CACHE_BYTES
	bdnz	1b
	sync
	isync
	blr

#ifndef CONFIG_BOOKE
/*
 * Flush a particular page from the data cache to RAM, identified
 * by its physical address.  We turn off the MMU so we can just use
 * the physical address (this may be a highmem page without a kernel
 * mapping).
 *
 *	void __flush_dcache_icache_phys(unsigned long physaddr)
 */
_GLOBAL(__flush_dcache_icache_phys)
BEGIN_FTR_SECTION
	PURGE_PREFETCHED_INS
	blr					/* for 601, do nothing */
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
	mfmsr	r10
	rlwinm	r0,r10,0,28,26			/* clear DR */
	mtmsr	r0
	isync
	rlwinm	r3,r3,0,0,31-PAGE_SHIFT		/* Get page base address */
	li	r4,PAGE_SIZE/L1_CACHE_BYTES	/* Number of lines in a page */
	mtctr	r4
	mr	r6,r3
0:	dcbst	0,r3				/* Write line to ram */
	addi	r3,r3,L1_CACHE_BYTES
	bdnz	0b
	sync
	mtctr	r4
1:	icbi	0,r6
	addi	r6,r6,L1_CACHE_BYTES
	bdnz	1b
	sync
	mtmsr	r10				/* restore DR */
	isync
	blr
#endif /* CONFIG_BOOKE */

/*
 * Copy a whole page.  We use the dcbz instruction on the destination
 * to reduce memory traffic (it eliminates the unnecessary reads of
 * the destination into cache).  This requires that the destination
 * is cacheable.
 */
#define COPY_16_BYTES		\
	lwz	r6,4(r4);	\
	lwz	r7,8(r4);	\
	lwz	r8,12(r4);	\
	lwzu	r9,16(r4);	\
	stw	r6,4(r3);	\
	stw	r7,8(r3);	\
	stw	r8,12(r3);	\
	stwu	r9,16(r3)

_GLOBAL(copy_page)
	addi	r3,r3,-4
	addi	r4,r4,-4

	li	r5,4

#if MAX_COPY_PREFETCH > 1
	li	r0,MAX_COPY_PREFETCH
	li	r11,4
	mtctr	r0
11:	dcbt	r11,r4
	addi	r11,r11,L1_CACHE_BYTES
	bdnz	11b
#else /* MAX_COPY_PREFETCH == 1 */
	dcbt	r5,r4
	li	r11,L1_CACHE_BYTES+4
#endif /* MAX_COPY_PREFETCH */
	li	r0,PAGE_SIZE/L1_CACHE_BYTES - MAX_COPY_PREFETCH
	crclr	4*cr0+eq
2:
	mtctr	r0
1:
	dcbt	r11,r4
	dcbz	r5,r3
	COPY_16_BYTES
#if L1_CACHE_BYTES >= 32
	COPY_16_BYTES
#if L1_CACHE_BYTES >= 64
	COPY_16_BYTES
	COPY_16_BYTES
#if L1_CACHE_BYTES >= 128
	COPY_16_BYTES
	COPY_16_BYTES
	COPY_16_BYTES
	COPY_16_BYTES
#endif
#endif
#endif
	bdnz	1b
	beqlr
	crnot	4*cr0+eq,4*cr0+eq
	li	r0,MAX_COPY_PREFETCH
	li	r11,4
	b	2b
EXPORT_SYMBOL(copy_page)

/*
 * Extended precision shifts.
 *
 * Updated to be valid for shift counts from 0 to 63 inclusive.
 * -- Gabriel
 *
 * R3/R4 has 64 bit value
 * R5    has shift count
 * result in R3/R4
 *
 *  ashrdi3: arithmetic right shift (sign propagation)	
 *  lshrdi3: logical right shift
 *  ashldi3: left shift
 */
_GLOBAL(__ashrdi3)
	subfic	r6,r5,32
	srw	r4,r4,r5	# LSW = count > 31 ? 0 : LSW >> count
	addi	r7,r5,32	# could be xori, or addi with -32
	slw	r6,r3,r6	# t1 = count > 31 ? 0 : MSW << (32-count)
	rlwinm	r8,r7,0,32	# t3 = (count < 32) ? 32 : 0
	sraw	r7,r3,r7	# t2 = MSW >> (count-32)
	or	r4,r4,r6	# LSW |= t1
	slw	r7,r7,r8	# t2 = (count < 32) ? 0 : t2
	sraw	r3,r3,r5	# MSW = MSW >> count
	or	r4,r4,r7	# LSW |= t2
	blr
EXPORT_SYMBOL(__ashrdi3)

_GLOBAL(__ashldi3)
	subfic	r6,r5,32
	slw	r3,r3,r5	# MSW = count > 31 ? 0 : MSW << count
	addi	r7,r5,32	# could be xori, or addi with -32
	srw	r6,r4,r6	# t1 = count > 31 ? 0 : LSW >> (32-count)
	slw	r7,r4,r7	# t2 = count < 32 ? 0 : LSW << (count-32)
	or	r3,r3,r6	# MSW |= t1
	slw	r4,r4,r5	# LSW = LSW << count
	or	r3,r3,r7	# MSW |= t2
	blr
EXPORT_SYMBOL(__ashldi3)

_GLOBAL(__lshrdi3)
	subfic	r6,r5,32
	srw	r4,r4,r5	# LSW = count > 31 ? 0 : LSW >> count
	addi	r7,r5,32	# could be xori, or addi with -32
	slw	r6,r3,r6	# t1 = count > 31 ? 0 : MSW << (32-count)
	srw	r7,r3,r7	# t2 = count < 32 ? 0 : MSW >> (count-32)
	or	r4,r4,r6	# LSW |= t1
	srw	r3,r3,r5	# MSW = MSW >> count
	or	r4,r4,r7	# LSW |= t2
	blr
EXPORT_SYMBOL(__lshrdi3)

/*
 * 64-bit comparison: __cmpdi2(s64 a, s64 b)
 * Returns 0 if a < b, 1 if a == b, 2 if a > b.
 */
_GLOBAL(__cmpdi2)
	cmpw	r3,r5
	li	r3,1
	bne	1f
	cmplw	r4,r6
	beqlr
1:	li	r3,0
	bltlr
	li	r3,2
	blr
EXPORT_SYMBOL(__cmpdi2)
/*
 * 64-bit comparison: __ucmpdi2(u64 a, u64 b)
 * Returns 0 if a < b, 1 if a == b, 2 if a > b.
 */
_GLOBAL(__ucmpdi2)
	cmplw	r3,r5
	li	r3,1
	bne	1f
	cmplw	r4,r6
	beqlr
1:	li	r3,0
	bltlr
	li	r3,2
	blr
EXPORT_SYMBOL(__ucmpdi2)

_GLOBAL(__bswapdi2)
	rotlwi  r9,r4,8
	rotlwi  r10,r3,8
	rlwimi  r9,r4,24,0,7
	rlwimi  r10,r3,24,0,7
	rlwimi  r9,r4,24,16,23
	rlwimi  r10,r3,24,16,23
	mr      r3,r9
	mr      r4,r10
	blr
EXPORT_SYMBOL(__bswapdi2)

#ifdef CONFIG_SMP
_GLOBAL(start_secondary_resume)
	/* Reset stack */
	CURRENT_THREAD_INFO(r1, r1)
	addi	r1,r1,THREAD_SIZE-STACK_FRAME_OVERHEAD
	li	r3,0
	stw	r3,0(r1)		/* Zero the stack frame pointer	*/
	bl	start_secondary
	b	.
#endif /* CONFIG_SMP */
	
/*
 * This routine is just here to keep GCC happy - sigh...
 */
_GLOBAL(__main)
	blr

#ifdef CONFIG_KEXEC
	/*
	 * Must be relocatable PIC code callable as a C function.
	 */
	.globl relocate_new_kernel
relocate_new_kernel:
	/* r3 = page_list   */
	/* r4 = reboot_code_buffer */
	/* r5 = start_address      */

#ifdef CONFIG_FSL_BOOKE

	mr	r29, r3
	mr	r30, r4
	mr	r31, r5

#define ENTRY_MAPPING_KEXEC_SETUP
#include "fsl_booke_entry_mapping.S"
#undef ENTRY_MAPPING_KEXEC_SETUP

	mr      r3, r29
	mr      r4, r30
	mr      r5, r31

	li	r0, 0
#elif defined(CONFIG_44x)

	/* Save our parameters */
	mr	r29, r3
	mr	r30, r4
	mr	r31, r5

#ifdef CONFIG_PPC_47x
	/* Check for 47x cores */
	mfspr	r3,SPRN_PVR
	srwi	r3,r3,16
	cmplwi	cr0,r3,PVR_476FPE@h
	beq	setup_map_47x
	cmplwi	cr0,r3,PVR_476@h
	beq	setup_map_47x
	cmplwi	cr0,r3,PVR_476_ISS@h
	beq	setup_map_47x
#endif /* CONFIG_PPC_47x */
	
/*
 * Code for setting up 1:1 mapping for PPC440x for KEXEC
 *
 * We cannot switch off the MMU on PPC44x.
 * So we:
 * 1) Invalidate all the mappings except the one we are running from.
 * 2) Create a tmp mapping for our code in the other address space(TS) and
 *    jump to it. Invalidate the entry we started in.
 * 3) Create a 1:1 mapping for 0-2GiB in chunks of 256M in original TS.
 * 4) Jump to the 1:1 mapping in original TS.
 * 5) Invalidate the tmp mapping.
 *
 * - Based on the kexec support code for FSL BookE
 *
 */

	/* 
	 * Load the PID with kernel PID (0).
	 * Also load our MSR_IS and TID to MMUCR for TLB search.
	 */
	li	r3, 0
	mtspr	SPRN_PID, r3
	mfmsr	r4
	andi.	r4,r4,MSR_IS@l
	beq	wmmucr
	oris	r3,r3,PPC44x_MMUCR_STS@h
wmmucr:
	mtspr	SPRN_MMUCR,r3
	sync

	/*
	 * Invalidate all the TLB entries except the current entry
	 * where we are running from
	 */
	bl	0f				/* Find our address */
0:	mflr	r5				/* Make it accessible */
	tlbsx	r23,0,r5			/* Find entry we are in */
	li	r4,0				/* Start at TLB entry 0 */
	li	r3,0				/* Set PAGEID inval value */
1:	cmpw	r23,r4				/* Is this our entry? */
	beq	skip				/* If so, skip the inval */
	tlbwe	r3,r4,PPC44x_TLB_PAGEID		/* If not, inval the entry */
skip:
	addi	r4,r4,1				/* Increment */
	cmpwi	r4,64				/* Are we done?	*/
	bne	1b				/* If not, repeat */
	isync

	/* Create a temp mapping and jump to it */
	andi.	r6, r23, 1		/* Find the index to use */
	addi	r24, r6, 1		/* r24 will contain 1 or 2 */

	mfmsr	r9			/* get the MSR */
	rlwinm	r5, r9, 27, 31, 31	/* Extract the MSR[IS] */
	xori	r7, r5, 1		/* Use the other address space */

	/* Read the current mapping entries */
	tlbre	r3, r23, PPC44x_TLB_PAGEID
	tlbre	r4, r23, PPC44x_TLB_XLAT
	tlbre	r5, r23, PPC44x_TLB_ATTRIB

	/* Save our current XLAT entry */
	mr	r25, r4

	/* Extract the TLB PageSize */
	li	r10, 1 			/* r10 will hold PageSize */
	rlwinm	r11, r3, 0, 24, 27	/* bits 24-27 */

	/* XXX: As of now we use 256M, 4K pages */
	cmpwi	r11, PPC44x_TLB_256M
	bne	tlb_4k
	rotlwi	r10, r10, 28		/* r10 = 256M */
	b	write_out
tlb_4k:
	cmpwi	r11, PPC44x_TLB_4K
	bne	default
	rotlwi	r10, r10, 12		/* r10 = 4K */
	b	write_out
default:
	rotlwi	r10, r10, 10		/* r10 = 1K */

write_out:
	/*
	 * Write out the tmp 1:1 mapping for this code in other address space
	 * Fixup  EPN = RPN , TS=other address space
	 */
	insrwi	r3, r7, 1, 23		/* Bit 23 is TS for PAGEID field */

	/* Write out the tmp mapping entries */
	tlbwe	r3, r24, PPC44x_TLB_PAGEID
	tlbwe	r4, r24, PPC44x_TLB_XLAT
	tlbwe	r5, r24, PPC44x_TLB_ATTRIB

	subi	r11, r10, 1		/* PageOffset Mask = PageSize - 1 */
	not	r10, r11		/* Mask for PageNum */

	/* Switch to other address space in MSR */
	insrwi	r9, r7, 1, 26		/* Set MSR[IS] = r7 */

	bl	1f
1:	mflr	r8
	addi	r8, r8, (2f-1b)		/* Find the target offset */

	/* Jump to the tmp mapping */
	mtspr	SPRN_SRR0, r8
	mtspr	SPRN_SRR1, r9
	rfi

2:
	/* Invalidate the entry we were executing from */
	li	r3, 0
	tlbwe	r3, r23, PPC44x_TLB_PAGEID

	/* attribute fields. rwx for SUPERVISOR mode */
	li	r5, 0
	ori	r5, r5, (PPC44x_TLB_SW | PPC44x_TLB_SR | PPC44x_TLB_SX | PPC44x_TLB_G)

	/* Create 1:1 mapping in 256M pages */
	xori	r7, r7, 1			/* Revert back to Original TS */

	li	r8, 0				/* PageNumber */
	li	r6, 3				/* TLB Index, start at 3  */

next_tlb:
	rotlwi	r3, r8, 28			/* Create EPN (bits 0-3) */
	mr	r4, r3				/* RPN = EPN  */
	ori	r3, r3, (PPC44x_TLB_VALID | PPC44x_TLB_256M) /* SIZE = 256M, Valid */
	insrwi	r3, r7, 1, 23			/* Set TS from r7 */

	tlbwe	r3, r6, PPC44x_TLB_PAGEID	/* PageID field : EPN, V, SIZE */
	tlbwe	r4, r6, PPC44x_TLB_XLAT		/* Address translation : RPN   */
	tlbwe	r5, r6, PPC44x_TLB_ATTRIB	/* Attributes */

	addi	r8, r8, 1			/* Increment PN */
	addi	r6, r6, 1			/* Increment TLB Index */
	cmpwi	r8, 8				/* Are we done ? */
	bne	next_tlb
	isync

	/* Jump to the new mapping 1:1 */
	li	r9,0
	insrwi	r9, r7, 1, 26			/* Set MSR[IS] = r7 */

	bl	1f
1:	mflr	r8
	and	r8, r8, r11			/* Get our offset within page */
	addi	r8, r8, (2f-1b)

	and	r5, r25, r10			/* Get our target PageNum */
	or	r8, r8, r5			/* Target jump address */

	mtspr	SPRN_SRR0, r8
	mtspr	SPRN_SRR1, r9
	rfi
2:
	/* Invalidate the tmp entry we used */
	li	r3, 0
	tlbwe	r3, r24, PPC44x_TLB_PAGEID
	sync
	b	ppc44x_map_done

#ifdef CONFIG_PPC_47x

	/* 1:1 mapping for 47x */

setup_map_47x:

	/*
	 * Load the kernel pid (0) to PID and also to MMUCR[TID].
	 * Also set the MSR IS->MMUCR STS
	 */
	li	r3, 0
	mtspr	SPRN_PID, r3			/* Set PID */
	mfmsr	r4				/* Get MSR */
	andi.	r4, r4, MSR_IS@l		/* TS=1? */
	beq	1f				/* If not, leave STS=0 */
	oris	r3, r3, PPC47x_MMUCR_STS@h	/* Set STS=1 */
1:	mtspr	SPRN_MMUCR, r3			/* Put MMUCR */
	sync

	/* Find the entry we are running from */
	bl	2f
2:	mflr	r23
	tlbsx	r23, 0, r23
	tlbre	r24, r23, 0			/* TLB Word 0 */
	tlbre	r25, r23, 1			/* TLB Word 1 */
	tlbre	r26, r23, 2			/* TLB Word 2 */


	/*
	 * Invalidates all the tlb entries by writing to 256 RPNs(r4)
	 * of 4k page size in all  4 ways (0-3 in r3).
	 * This would invalidate the entire UTLB including the one we are
	 * running from. However the shadow TLB entries would help us 
	 * to continue the execution, until we flush them (rfi/isync).
	 */
	addis	r3, 0, 0x8000			/* specify the way */
	addi	r4, 0, 0			/* TLB Word0 = (EPN=0, VALID = 0) */
	addi	r5, 0, 0
	b	clear_utlb_entry

	/* Align the loop to speed things up. from head_44x.S */
	.align	6

clear_utlb_entry:

	tlbwe	r4, r3, 0
	tlbwe	r5, r3, 1
	tlbwe	r5, r3, 2
	addis	r3, r3, 0x2000			/* Increment the way */
	cmpwi	r3, 0
	bne	clear_utlb_entry
	addis	r3, 0, 0x8000
	addis	r4, r4, 0x100			/* Increment the EPN */
	cmpwi	r4, 0
	bne	clear_utlb_entry

	/* Create the entries in the other address space */
	mfmsr	r5
	rlwinm	r7, r5, 27, 31, 31		/* Get the TS (Bit 26) from MSR */
	xori	r7, r7, 1			/* r7 = !TS */

	insrwi	r24, r7, 1, 21			/* Change the TS in the saved TLB word 0 */

	/* 
	 * write out the TLB entries for the tmp mapping
	 * Use way '0' so that we could easily invalidate it later.
	 */
	lis	r3, 0x8000			/* Way '0' */ 

	tlbwe	r24, r3, 0
	tlbwe	r25, r3, 1
	tlbwe	r26, r3, 2

	/* Update the msr to the new TS */
	insrwi	r5, r7, 1, 26

	bl	1f
1:	mflr	r6
	addi	r6, r6, (2f-1b)

	mtspr	SPRN_SRR0, r6
	mtspr	SPRN_SRR1, r5
	rfi

	/* 
	 * Now we are in the tmp address space.
	 * Create a 1:1 mapping for 0-2GiB in the original TS.
	 */
2:
	li	r3, 0
	li	r4, 0				/* TLB Word 0 */
	li	r5, 0				/* TLB Word 1 */
	li	r6, 0
	ori	r6, r6, PPC47x_TLB2_S_RWX	/* TLB word 2 */

	li	r8, 0				/* PageIndex */

	xori	r7, r7, 1			/* revert back to original TS */

write_utlb:
	rotlwi	r5, r8, 28			/* RPN = PageIndex * 256M */
						/* ERPN = 0 as we don't use memory above 2G */

	mr	r4, r5				/* EPN = RPN */
	ori	r4, r4, (PPC47x_TLB0_VALID | PPC47x_TLB0_256M)
	insrwi	r4, r7, 1, 21			/* Insert the TS to Word 0 */

	tlbwe	r4, r3, 0			/* Write out the entries */
	tlbwe	r5, r3, 1
	tlbwe	r6, r3, 2
	addi	r8, r8, 1
	cmpwi	r8, 8				/* Have we completed ? */
	bne	write_utlb

	/* make sure we complete the TLB write up */
	isync

	/* 
	 * Prepare to jump to the 1:1 mapping.
	 * 1) Extract page size of the tmp mapping
	 *    DSIZ = TLB_Word0[22:27]
	 * 2) Calculate the physical address of the address
	 *    to jump to.
	 */
	rlwinm	r10, r24, 0, 22, 27

	cmpwi	r10, PPC47x_TLB0_4K
	bne	0f
	li	r10, 0x1000			/* r10 = 4k */
	bl	1f

0:
	/* Defaults to 256M */
	lis	r10, 0x1000
	
	bl	1f
1:	mflr	r4
	addi	r4, r4, (2f-1b)			/* virtual address  of 2f */

	subi	r11, r10, 1			/* offsetmask = Pagesize - 1 */
	not	r10, r11			/* Pagemask = ~(offsetmask) */

	and	r5, r25, r10			/* Physical page */
	and	r6, r4, r11			/* offset within the current page */

	or	r5, r5, r6			/* Physical address for 2f */

	/* Switch the TS in MSR to the original one */
	mfmsr	r8
	insrwi	r8, r7, 1, 26

	mtspr	SPRN_SRR1, r8
	mtspr	SPRN_SRR0, r5
	rfi

2:
	/* Invalidate the tmp mapping */
	lis	r3, 0x8000			/* Way '0' */

	clrrwi	r24, r24, 12			/* Clear the valid bit */
	tlbwe	r24, r3, 0
	tlbwe	r25, r3, 1
	tlbwe	r26, r3, 2

	/* Make sure we complete the TLB write and flush the shadow TLB */
	isync

#endif

ppc44x_map_done:


	/* Restore the parameters */
	mr	r3, r29
	mr	r4, r30
	mr	r5, r31

	li	r0, 0
#else
	li	r0, 0

	/*
	 * Set Machine Status Register to a known status,
	 * switch the MMU off and jump to 1: in a single step.
	 */

	mr	r8, r0
	ori     r8, r8, MSR_RI|MSR_ME
	mtspr	SPRN_SRR1, r8
	addi	r8, r4, 1f - relocate_new_kernel
	mtspr	SPRN_SRR0, r8
	sync
	rfi

1:
#endif
	/* from this point address translation is turned off */
	/* and interrupts are disabled */

	/* set a new stack at the bottom of our page... */
	/* (not really needed now) */
	addi	r1, r4, KEXEC_CONTROL_PAGE_SIZE - 8 /* for LR Save+Back Chain */
	stw	r0, 0(r1)

	/* Do the copies */
	li	r6, 0 /* checksum */
	mr	r0, r3
	b	1f

0:	/* top, read another word for the indirection page */
	lwzu	r0, 4(r3)

1:
	/* is it a destination page? (r8) */
	rlwinm.	r7, r0, 0, 31, 31 /* IND_DESTINATION (1<<0) */
	beq	2f

	rlwinm	r8, r0, 0, 0, 19 /* clear kexec flags, page align */
	b	0b

2:	/* is it an indirection page? (r3) */
	rlwinm.	r7, r0, 0, 30, 30 /* IND_INDIRECTION (1<<1) */
	beq	2f

	rlwinm	r3, r0, 0, 0, 19 /* clear kexec flags, page align */
	subi	r3, r3, 4
	b	0b

2:	/* are we done? */
	rlwinm.	r7, r0, 0, 29, 29 /* IND_DONE (1<<2) */
	beq	2f
	b	3f

2:	/* is it a source page? (r9) */
	rlwinm.	r7, r0, 0, 28, 28 /* IND_SOURCE (1<<3) */
	beq	0b

	rlwinm	r9, r0, 0, 0, 19 /* clear kexec flags, page align */

	li	r7, PAGE_SIZE / 4
	mtctr   r7
	subi    r9, r9, 4
	subi    r8, r8, 4
9:
	lwzu    r0, 4(r9)  /* do the copy */
	xor	r6, r6, r0
	stwu    r0, 4(r8)
	dcbst	0, r8
	sync
	icbi	0, r8
	bdnz    9b

	addi    r9, r9, 4
	addi    r8, r8, 4
	b	0b

3:

	/* To be certain of avoiding problems with self-modifying code
	 * execute a serializing instruction here.
	 */
	isync
	sync

	mfspr	r3, SPRN_PIR /* current core we are running on */
	mr	r4, r5 /* load physical address of chunk called */

	/* jump to the entry point, usually the setup routine */
	mtlr	r5
	blrl

1:	b	1b

relocate_new_kernel_end:

	.globl relocate_new_kernel_size
relocate_new_kernel_size:
	.long relocate_new_kernel_end - relocate_new_kernel
#endif