summaryrefslogtreecommitdiff
path: root/cpu/mpc85xx/start.S
blob: e5cabcac054899535389f958669d14490f42fdcc (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
/*
 * Copyright 2004, 2007 Freescale Semiconductor.
 * Copyright (C) 2003  Motorola,Inc.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/* U-Boot Startup Code for Motorola 85xx PowerPC based Embedded Boards
 *
 * The processor starts at 0xfffffffc and the code is first executed in the
 * last 4K page(0xfffff000-0xffffffff) in flash/rom.
 *
 */

#include <config.h>
#include <mpc85xx.h>
#include <version.h>

#define _LINUX_CONFIG_H 1	/* avoid reading Linux autoconf.h file	*/

#include <ppc_asm.tmpl>
#include <ppc_defs.h>

#include <asm/cache.h>
#include <asm/mmu.h>

#ifndef	 CONFIG_IDENT_STRING
#define	 CONFIG_IDENT_STRING ""
#endif

#undef	MSR_KERNEL
#define MSR_KERNEL ( MSR_ME )	/* Machine Check */

/*
 * Set up GOT: Global Offset Table
 *
 * Use r14 to access the GOT
 */
	START_GOT
	GOT_ENTRY(_GOT2_TABLE_)
	GOT_ENTRY(_FIXUP_TABLE_)

	GOT_ENTRY(_start)
	GOT_ENTRY(_start_of_vectors)
	GOT_ENTRY(_end_of_vectors)
	GOT_ENTRY(transfer_to_handler)

	GOT_ENTRY(__init_end)
	GOT_ENTRY(_end)
	GOT_ENTRY(__bss_start)
	END_GOT

/*
 * e500 Startup -- after reset only the last 4KB of the effective
 * address space is mapped in the MMU L2 TLB1 Entry0. The .bootpg
 * section is located at THIS LAST page and basically does three
 * things: clear some registers, set up exception tables and
 * add more TLB entries for 'larger spaces'(e.g. the boot rom) to
 * continue the boot procedure.

 * Once the boot rom is mapped by TLB entries we can proceed
 * with normal startup.
 *
 */

	.section .bootpg,"ax"
	.globl _start_e500

_start_e500:

/* clear registers/arrays not reset by hardware */

	/* L1 */
	li	r0,2
	mtspr	L1CSR0,r0	/* invalidate d-cache */
	mtspr	L1CSR1,r0 	/* invalidate i-cache */

	mfspr	r1,DBSR
	mtspr	DBSR,r1		/* Clear all valid bits */

	/*
	 *	Enable L1 Caches early
	 *
	 */

	lis	r2,L1CSR0_CPE@H	/* enable parity */
	ori	r2,r2,L1CSR0_DCE
	mtspr	L1CSR0,r2	/* enable L1 Dcache */
	isync
	mtspr	L1CSR1,r2	/* enable L1 Icache */
	isync
	msync

	/* Setup interrupt vectors */
	lis	r1,TEXT_BASE@h
	mtspr	IVPR,r1

	li	r1,0x0100
	mtspr	IVOR0,r1	/* 0: Critical input */
	li	r1,0x0200
	mtspr	IVOR1,r1	/* 1: Machine check */
	li	r1,0x0300
	mtspr	IVOR2,r1	/* 2: Data storage */
	li	r1,0x0400
	mtspr	IVOR3,r1	/* 3: Instruction storage */
	li	r1,0x0500
	mtspr	IVOR4,r1	/* 4: External interrupt */
	li	r1,0x0600
	mtspr	IVOR5,r1	/* 5: Alignment */
	li	r1,0x0700
	mtspr	IVOR6,r1	/* 6: Program check */
	li	r1,0x0800
	mtspr	IVOR7,r1	/* 7: floating point unavailable */
	li	r1,0x0900
	mtspr	IVOR8,r1	/* 8: System call */
	/* 9: Auxiliary processor unavailable(unsupported) */
	li	r1,0x0a00
	mtspr	IVOR10,r1	/* 10: Decrementer */
	li	r1,0x0b00
	mtspr	IVOR11,r1	/* 11: Interval timer */
	li	r1,0x0c00
	mtspr	IVOR12,r1	/* 12: Watchdog timer */
	li	r1,0x0d00
	mtspr	IVOR13,r1	/* 13: Data TLB error */
	li	r1,0x0e00
	mtspr	IVOR14,r1	/* 14: Instruction TLB error */
	li	r1,0x0f00
	mtspr	IVOR15,r1	/* 15: Debug */


	/*
	 * After reset, CCSRBAR is located at CFG_CCSRBAR_DEFAULT, i.e.
	 * 0xff700000-0xff800000. We need add a TLB1 entry for this 1MB
	 * region before we can access any CCSR registers such as L2
	 * registers, Local Access Registers,etc. We will also re-allocate
	 * CFG_CCSRBAR_DEFAULT to CFG_CCSRBAR immediately after TLB1 setup.
	 *
	 * Please refer to board-specif directory for TLB1 entry configuration.
	 * (e.g. board/<yourboard>/init.S)
	 *
	 */
	bl	tlb1_entry
	mr	r5,r0
	lwzu	r4,0(r5)	/* how many TLB1 entries we actually use */
	mtctr	r4

0:	lwzu	r6,4(r5)
	lwzu	r7,4(r5)
	lwzu	r8,4(r5)
	lwzu	r9,4(r5)
	mtspr	MAS0,r6
	mtspr	MAS1,r7
	mtspr	MAS2,r8
	mtspr	MAS3,r9
	isync
	msync
	tlbwe
	isync
	bdnz	0b

1:
#if (CFG_CCSRBAR_DEFAULT != CFG_CCSRBAR)
	/* Special sequence needed to update CCSRBAR itself */
	lis	r4,CFG_CCSRBAR_DEFAULT@h
	ori	r4,r4,CFG_CCSRBAR_DEFAULT@l

	lis	r5,CFG_CCSRBAR@h
	ori	r5,r5,CFG_CCSRBAR@l
	srwi	r6,r5,12
	stw	r6,0(r4)
	isync

	lis	r5,0xffff
	ori	r5,r5,0xf000
	lwz	r5,0(r5)
	isync

	lis	r3,CFG_CCSRBAR@h
	lwz	r5,CFG_CCSRBAR@l(r3)
	isync
#endif


	/* set up local access windows, defined at board/<boardname>/init.S */
	lis	r7,CFG_CCSRBAR@h
	ori	r7,r7,CFG_CCSRBAR@l

	bl	law_entry
	mr	r6,r0
	lwzu	r5,0(r6)	/* how many windows we actually use */
	mtctr	r5

	li	r2,0x0c28	/* the first pair is reserved for */
	li	r1,0x0c30	/* boot-over-rio-or-pci */

0:	lwzu	r4,4(r6)
	lwzu	r3,4(r6)
	stwx	r4,r7,r2
	stwx	r3,r7,r1
	addi	r2,r2,0x0020
	addi	r1,r1,0x0020
	bdnz	0b

	/* Clear and set up some registers. */
	li	r0,0x0000
	lis	r1,0xffff
	mtspr	DEC,r0			/* prevent dec exceptions */
	mttbl	r0			/* prevent fit & wdt exceptions */
	mttbu	r0
	mtspr	TSR,r1			/* clear all timer exception status */
	mtspr	TCR,r0			/* disable all */
	mtspr	ESR,r0			/* clear exception syndrome register */
	mtspr	MCSR,r0			/* machine check syndrome register */
	mtxer	r0			/* clear integer exception register */
	lis	r1,0x0002		/* set CE bit (Critical Exceptions) */
	ori	r1,r1,0x1200		/* set ME/DE bit */
	mtmsr	r1			/* change MSR */
	isync

	/* Enable Time Base and Select Time Base Clock */
	lis	r0,HID0_EMCP@h		/* Enable machine check */
#if defined(CONFIG_ENABLE_36BIT_PHYS)
	ori	r0,r0,(HID0_TBEN|HID0_ENMAS7)@l	/* Enable Timebase & MAS7 */
#else
	ori	r0,r0,HID0_TBEN@l	/* enable Timebase */
#endif
	mtspr	HID0,r0

	li	r0,(HID1_ASTME|HID1_ABE)@l	/* Addr streaming & broadcast */
	mtspr	HID1,r0

	/* Enable Branch Prediction */
#if defined(CONFIG_BTB)
	li	r0,0x201		/* BBFI = 1, BPEN = 1 */
	mtspr	BUCSR,r0
#endif

#if defined(CFG_INIT_DBCR)
	lis	r1,0xffff
	ori	r1,r1,0xffff
	mtspr	DBSR,r1			/* Clear all status bits */
	lis	r0,CFG_INIT_DBCR@h	/* DBCR0[IDM] must be set */
	ori	r0,r0,CFG_INIT_DBCR@l
	mtspr	DBCR0,r0
#endif

/* L1 DCache is used for initial RAM */

	/* Allocate Initial RAM in data cache.
	 */
	lis	r3,CFG_INIT_RAM_ADDR@h
	ori	r3,r3,CFG_INIT_RAM_ADDR@l
	li	r2,(CFG_DCACHE_SIZE / (2 * CFG_CACHELINE_SIZE)) 
	mtctr	r2
	li	r0,0
1:
	dcbz	r0,r3
	dcbtls	0,r0,r3
	addi	r3,r3,CFG_CACHELINE_SIZE
	bdnz	1b

	/* Jump out the last 4K page and continue to 'normal' start */
#ifdef CFG_RAMBOOT
	bl	3f
	b	_start_cont
#else
	/* Calculate absolute address in FLASH and jump there		*/
	/*--------------------------------------------------------------*/
	lis	r3,CFG_MONITOR_BASE@h
	ori	r3,r3,CFG_MONITOR_BASE@l
	addi	r3,r3,_start_cont - _start + _START_OFFSET
	mtlr	r3
#endif

3:	li	r0,0
	mtspr	SRR1,r0		/* Keep things disabled for now */
	mflr	r1
	mtspr	SRR0,r1
	rfi
	isync

	.text
	.globl	_start
_start:
	.long	0x27051956		/* U-BOOT Magic Number */
	.globl	version_string
version_string:
	.ascii U_BOOT_VERSION
	.ascii " (", __DATE__, " - ", __TIME__, ")"
	.ascii CONFIG_IDENT_STRING, "\0"

	.align	4
	.globl	_start_cont
_start_cont:
	/* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
	lis	r1,CFG_INIT_RAM_ADDR@h
	ori	r1,r1,CFG_INIT_SP_OFFSET@l

	li	r0,0
	stwu	r0,-4(r1)
	stwu	r0,-4(r1)		/* Terminate call chain */

	stwu	r1,-8(r1)		/* Save back chain and move SP */
	lis	r0,RESET_VECTOR@h	/* Address of reset vector */
	ori	r0,r0,RESET_VECTOR@l
	stwu	r1,-8(r1)		/* Save back chain and move SP */
	stw	r0,+12(r1)		/* Save return addr (underflow vect) */

	GET_GOT
	bl	cpu_init_f
	bl	board_init_f
	isync

	. = EXC_OFF_SYS_RESET
	.globl	_start_of_vectors
_start_of_vectors:

/* Critical input. */
	CRIT_EXCEPTION(0x0100, CriticalInput, CritcalInputException)

/* Machine check */
	MCK_EXCEPTION(0x200, MachineCheck, MachineCheckException)

/* Data Storage exception. */
	STD_EXCEPTION(0x0300, DataStorage, UnknownException)

/* Instruction Storage exception. */
	STD_EXCEPTION(0x0400, InstStorage, UnknownException)

/* External Interrupt exception. */
	STD_EXCEPTION(0x0500, ExtInterrupt, ExtIntException)

/* Alignment exception. */
	. = 0x0600
Alignment:
	EXCEPTION_PROLOG(SRR0, SRR1)
	mfspr	r4,DAR
	stw	r4,_DAR(r21)
	mfspr	r5,DSISR
	stw	r5,_DSISR(r21)
	addi	r3,r1,STACK_FRAME_OVERHEAD
	li	r20,MSR_KERNEL
	rlwimi	r20,r23,0,16,16		/* copy EE bit from saved MSR */
	lwz	r6,GOT(transfer_to_handler)
	mtlr	r6
	blrl
.L_Alignment:
	.long	AlignmentException - _start + _START_OFFSET
	.long	int_return - _start + _START_OFFSET

/* Program check exception */
	. = 0x0700
ProgramCheck:
	EXCEPTION_PROLOG(SRR0, SRR1)
	addi	r3,r1,STACK_FRAME_OVERHEAD
	li	r20,MSR_KERNEL
	rlwimi	r20,r23,0,16,16		/* copy EE bit from saved MSR */
	lwz	r6,GOT(transfer_to_handler)
	mtlr	r6
	blrl
.L_ProgramCheck:
	.long	ProgramCheckException - _start + _START_OFFSET
	.long	int_return - _start + _START_OFFSET

	/* No FPU on MPC85xx.  This exception is not supposed to happen.
	*/
	STD_EXCEPTION(0x0800, FPUnavailable, UnknownException)

	. = 0x0900
/*
 * r0 - SYSCALL number
 * r3-... arguments
 */
SystemCall:
	addis	r11,r0,0	/* get functions table addr */
	ori	r11,r11,0	/* Note: this code is patched in trap_init */
	addis	r12,r0,0	/* get number of functions */
	ori	r12,r12,0

	cmplw	0,r0,r12
	bge	1f

	rlwinm	r0,r0,2,0,31	/* fn_addr = fn_tbl[r0] */
	add	r11,r11,r0
	lwz	r11,0(r11)

	li	r20,0xd00-4	/* Get stack pointer */
	lwz	r12,0(r20)
	subi	r12,r12,12	/* Adjust stack pointer */
	li	r0,0xc00+_end_back-SystemCall
	cmplw	0,r0,r12	/* Check stack overflow */
	bgt	1f
	stw	r12,0(r20)

	mflr	r0
	stw	r0,0(r12)
	mfspr	r0,SRR0
	stw	r0,4(r12)
	mfspr	r0,SRR1
	stw	r0,8(r12)

	li	r12,0xc00+_back-SystemCall
	mtlr	r12
	mtspr	SRR0,r11

1:	SYNC
	rfi
_back:

	mfmsr	r11			/* Disable interrupts */
	li	r12,0
	ori	r12,r12,MSR_EE
	andc	r11,r11,r12
	SYNC				/* Some chip revs need this... */
	mtmsr	r11
	SYNC

	li	r12,0xd00-4		/* restore regs */
	lwz	r12,0(r12)

	lwz	r11,0(r12)
	mtlr	r11
	lwz	r11,4(r12)
	mtspr	SRR0,r11
	lwz	r11,8(r12)
	mtspr	SRR1,r11

	addi	r12,r12,12		/* Adjust stack pointer */
	li	r20,0xd00-4
	stw	r12,0(r20)

	SYNC
	rfi
_end_back:

	STD_EXCEPTION(0x0a00, Decrementer, timer_interrupt)
	STD_EXCEPTION(0x0b00, IntervalTimer, UnknownException)
	STD_EXCEPTION(0x0c00, WatchdogTimer, UnknownException)

	STD_EXCEPTION(0x0d00, DataTLBError, UnknownException)
	STD_EXCEPTION(0x0e00, InstructionTLBError, UnknownException)

	CRIT_EXCEPTION(0x0f00, DebugBreakpoint, DebugException )

	.globl	_end_of_vectors
_end_of_vectors:


	. = . + (0x100 - ( . & 0xff ))	/* align for debug */

/*
 * This code finishes saving the registers to the exception frame
 * and jumps to the appropriate handler for the exception.
 * Register r21 is pointer into trap frame, r1 has new stack pointer.
 */
	.globl	transfer_to_handler
transfer_to_handler:
	stw	r22,_NIP(r21)
	lis	r22,MSR_POW@h
	andc	r23,r23,r22
	stw	r23,_MSR(r21)
	SAVE_GPR(7, r21)
	SAVE_4GPRS(8, r21)
	SAVE_8GPRS(12, r21)
	SAVE_8GPRS(24, r21)

	mflr	r23
	andi.	r24,r23,0x3f00		/* get vector offset */
	stw	r24,TRAP(r21)
	li	r22,0
	stw	r22,RESULT(r21)
	mtspr	SPRG2,r22		/* r1 is now kernel sp */

	lwz	r24,0(r23)		/* virtual address of handler */
	lwz	r23,4(r23)		/* where to go when done */
	mtspr	SRR0,r24
	mtspr	SRR1,r20
	mtlr	r23
	SYNC
	rfi				/* jump to handler, enable MMU */

int_return:
	mfmsr	r28		/* Disable interrupts */
	li	r4,0
	ori	r4,r4,MSR_EE
	andc	r28,r28,r4
	SYNC			/* Some chip revs need this... */
	mtmsr	r28
	SYNC
	lwz	r2,_CTR(r1)
	lwz	r0,_LINK(r1)
	mtctr	r2
	mtlr	r0
	lwz	r2,_XER(r1)
	lwz	r0,_CCR(r1)
	mtspr	XER,r2
	mtcrf	0xFF,r0
	REST_10GPRS(3, r1)
	REST_10GPRS(13, r1)
	REST_8GPRS(23, r1)
	REST_GPR(31, r1)
	lwz	r2,_NIP(r1)	/* Restore environment */
	lwz	r0,_MSR(r1)
	mtspr	SRR0,r2
	mtspr	SRR1,r0
	lwz	r0,GPR0(r1)
	lwz	r2,GPR2(r1)
	lwz	r1,GPR1(r1)
	SYNC
	rfi

crit_return:
	mfmsr	r28		/* Disable interrupts */
	li	r4,0
	ori	r4,r4,MSR_EE
	andc	r28,r28,r4
	SYNC			/* Some chip revs need this... */
	mtmsr	r28
	SYNC
	lwz	r2,_CTR(r1)
	lwz	r0,_LINK(r1)
	mtctr	r2
	mtlr	r0
	lwz	r2,_XER(r1)
	lwz	r0,_CCR(r1)
	mtspr	XER,r2
	mtcrf	0xFF,r0
	REST_10GPRS(3, r1)
	REST_10GPRS(13, r1)
	REST_8GPRS(23, r1)
	REST_GPR(31, r1)
	lwz	r2,_NIP(r1)	/* Restore environment */
	lwz	r0,_MSR(r1)
	mtspr	SPRN_CSRR0,r2
	mtspr	SPRN_CSRR1,r0
	lwz	r0,GPR0(r1)
	lwz	r2,GPR2(r1)
	lwz	r1,GPR1(r1)
	SYNC
	rfci

mck_return:
	mfmsr	r28		/* Disable interrupts */
	li	r4,0
	ori	r4,r4,MSR_EE
	andc	r28,r28,r4
	SYNC			/* Some chip revs need this... */
	mtmsr	r28
	SYNC
	lwz	r2,_CTR(r1)
	lwz	r0,_LINK(r1)
	mtctr	r2
	mtlr	r0
	lwz	r2,_XER(r1)
	lwz	r0,_CCR(r1)
	mtspr	XER,r2
	mtcrf	0xFF,r0
	REST_10GPRS(3, r1)
	REST_10GPRS(13, r1)
	REST_8GPRS(23, r1)
	REST_GPR(31, r1)
	lwz	r2,_NIP(r1)	/* Restore environment */
	lwz	r0,_MSR(r1)
	mtspr	SPRN_MCSRR0,r2
	mtspr	SPRN_MCSRR1,r0
	lwz	r0,GPR0(r1)
	lwz	r2,GPR2(r1)
	lwz	r1,GPR1(r1)
	SYNC
	rfmci

/* Cache functions.
*/
invalidate_icache:
	mfspr	r0,L1CSR1
	ori	r0,r0,L1CSR1_ICFI
	msync
	isync
	mtspr	L1CSR1,r0
	isync
	blr				/* entire I cache */

invalidate_dcache:
	mfspr	r0,L1CSR0
	ori	r0,r0,L1CSR0_DCFI
	msync
	isync
	mtspr	L1CSR0,r0
	isync
	blr

	.globl	icache_enable
icache_enable:
	mflr	r8
	bl	invalidate_icache
	mtlr	r8
	isync
	mfspr	r4,L1CSR1
	ori	r4,r4,0x0001
	oris	r4,r4,0x0001
	mtspr	L1CSR1,r4
	isync
	blr

	.globl	icache_disable
icache_disable:
	mfspr	r0,L1CSR1
	lis	r3,0
	ori	r3,r3,L1CSR1_ICE
	andc	r0,r0,r3
	mtspr	L1CSR1,r0
	isync
	blr

	.globl	icache_status
icache_status:
	mfspr	r3,L1CSR1
	andi.	r3,r3,L1CSR1_ICE
	blr

	.globl	dcache_enable
dcache_enable:
	mflr	r8
	bl	invalidate_dcache
	mtlr	r8
	isync
	mfspr	r0,L1CSR0
	ori	r0,r0,0x0001
	oris	r0,r0,0x0001
	msync
	isync
	mtspr	L1CSR0,r0
	isync
	blr

	.globl	dcache_disable
dcache_disable:
	mfspr	r3,L1CSR0
	lis	r4,0
	ori	r4,r4,L1CSR0_DCE
	andc	r3,r3,r4
	mtspr	L1CSR0,r0
	isync
	blr

	.globl	dcache_status
dcache_status:
	mfspr	r3,L1CSR0
	andi.	r3,r3,L1CSR0_DCE
	blr

	.globl get_pir
get_pir:
	mfspr	r3,PIR
	blr

	.globl get_pvr
get_pvr:
	mfspr	r3,PVR
	blr

	.globl get_svr
get_svr:
	mfspr	r3,SVR
	blr

	.globl wr_tcr
wr_tcr:
	mtspr	TCR,r3
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 in8 */
/* Description:	 Input 8 bits */
/*------------------------------------------------------------------------------- */
	.globl	in8
in8:
	lbz	r3,0x0000(r3)
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 out8 */
/* Description:	 Output 8 bits */
/*------------------------------------------------------------------------------- */
	.globl	out8
out8:
	stb	r4,0x0000(r3)
	sync
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 out16 */
/* Description:	 Output 16 bits */
/*------------------------------------------------------------------------------- */
	.globl	out16
out16:
	sth	r4,0x0000(r3)
	sync
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 out16r */
/* Description:	 Byte reverse and output 16 bits */
/*------------------------------------------------------------------------------- */
	.globl	out16r
out16r:
	sthbrx	r4,r0,r3
	sync
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 out32 */
/* Description:	 Output 32 bits */
/*------------------------------------------------------------------------------- */
	.globl	out32
out32:
	stw	r4,0x0000(r3)
	sync
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 out32r */
/* Description:	 Byte reverse and output 32 bits */
/*------------------------------------------------------------------------------- */
	.globl	out32r
out32r:
	stwbrx	r4,r0,r3
	sync
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 in16 */
/* Description:	 Input 16 bits */
/*------------------------------------------------------------------------------- */
	.globl	in16
in16:
	lhz	r3,0x0000(r3)
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 in16r */
/* Description:	 Input 16 bits and byte reverse */
/*------------------------------------------------------------------------------- */
	.globl	in16r
in16r:
	lhbrx	r3,r0,r3
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 in32 */
/* Description:	 Input 32 bits */
/*------------------------------------------------------------------------------- */
	.globl	in32
in32:
	lwz	3,0x0000(3)
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 in32r */
/* Description:	 Input 32 bits and byte reverse */
/*------------------------------------------------------------------------------- */
	.globl	in32r
in32r:
	lwbrx	r3,r0,r3
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 ppcDcbf */
/* Description:	 Data Cache block flush */
/* Input:	 r3 = effective address */
/* Output:	 none. */
/*------------------------------------------------------------------------------- */
	.globl	ppcDcbf
ppcDcbf:
	dcbf	r0,r3
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 ppcDcbi */
/* Description:	 Data Cache block Invalidate */
/* Input:	 r3 = effective address */
/* Output:	 none. */
/*------------------------------------------------------------------------------- */
	.globl	ppcDcbi
ppcDcbi:
	dcbi	r0,r3
	blr

/*--------------------------------------------------------------------------
 * Function:	 ppcDcbz
 * Description:	 Data Cache block zero.
 * Input:	 r3 = effective address
 * Output:	 none.
 *-------------------------------------------------------------------------- */

	.globl	ppcDcbz
ppcDcbz:
	dcbz	r0,r3
	blr

/*------------------------------------------------------------------------------- */
/* Function:	 ppcSync */
/* Description:	 Processor Synchronize */
/* Input:	 none. */
/* Output:	 none. */
/*------------------------------------------------------------------------------- */
	.globl	ppcSync
ppcSync:
	sync
	blr

/*------------------------------------------------------------------------------*/

/*
 * void relocate_code (addr_sp, gd, addr_moni)
 *
 * This "function" does not return, instead it continues in RAM
 * after relocating the monitor code.
 *
 * r3 = dest
 * r4 = src
 * r5 = length in bytes
 * r6 = cachelinesize
 */
	.globl	relocate_code
relocate_code:
	mr	r1,r3		/* Set new stack pointer		*/
	mr	r9,r4		/* Save copy of Init Data pointer	*/
	mr	r10,r5		/* Save copy of Destination Address	*/

	mr	r3,r5				/* Destination Address	*/
	lis	r4,CFG_MONITOR_BASE@h		/* Source      Address	*/
	ori	r4,r4,CFG_MONITOR_BASE@l
	lwz	r5,GOT(__init_end)
	sub	r5,r5,r4
	li	r6,CFG_CACHELINE_SIZE		/* Cache Line Size	*/

	/*
	 * Fix GOT pointer:
	 *
	 * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
	 *
	 * Offset:
	 */
	sub	r15,r10,r4

	/* First our own GOT */
	add	r14,r14,r15
	/* the the one used by the C code */
	add	r30,r30,r15

	/*
	 * Now relocate code
	 */

	cmplw	cr1,r3,r4
	addi	r0,r5,3
	srwi.	r0,r0,2
	beq	cr1,4f		/* In place copy is not necessary	*/
	beq	7f		/* Protect against 0 count		*/
	mtctr	r0
	bge	cr1,2f

	la	r8,-4(r4)
	la	r7,-4(r3)
1:	lwzu	r0,4(r8)
	stwu	r0,4(r7)
	bdnz	1b
	b	4f

2:	slwi	r0,r0,2
	add	r8,r4,r0
	add	r7,r3,r0
3:	lwzu	r0,-4(r8)
	stwu	r0,-4(r7)
	bdnz	3b

/*
 * Now flush the cache: note that we must start from a cache aligned
 * address. Otherwise we might miss one cache line.
 */
4:	cmpwi	r6,0
	add	r5,r3,r5
	beq	7f		/* Always flush prefetch queue in any case */
	subi	r0,r6,1
	andc	r3,r3,r0
	mr	r4,r3
5:	dcbst	0,r4
	add	r4,r4,r6
	cmplw	r4,r5
	blt	5b
	sync			/* Wait for all dcbst to complete on bus */
	mr	r4,r3
6:	icbi	0,r4
	add	r4,r4,r6
	cmplw	r4,r5
	blt	6b
7:	sync			/* Wait for all icbi to complete on bus */
	isync

	/*
	 * Re-point the IVPR at RAM
	 */
	mtspr	IVPR,r10

/*
 * We are done. Do not return, instead branch to second part of board
 * initialization, now running from RAM.
 */

	addi	r0,r10,in_ram - _start + _START_OFFSET
	mtlr	r0
	blr				/* NEVER RETURNS! */
	.globl	in_ram
in_ram:

	/*
	 * Relocation Function, r14 point to got2+0x8000
	 *
	 * Adjust got2 pointers, no need to check for 0, this code
	 * already puts a few entries in the table.
	 */
	li	r0,__got2_entries@sectoff@l
	la	r3,GOT(_GOT2_TABLE_)
	lwz	r11,GOT(_GOT2_TABLE_)
	mtctr	r0
	sub	r11,r3,r11
	addi	r3,r3,-4
1:	lwzu	r0,4(r3)
	add	r0,r0,r11
	stw	r0,0(r3)
	bdnz	1b

	/*
	 * Now adjust the fixups and the pointers to the fixups
	 * in case we need to move ourselves again.
	 */
2:	li	r0,__fixup_entries@sectoff@l
	lwz	r3,GOT(_FIXUP_TABLE_)
	cmpwi	r0,0
	mtctr	r0
	addi	r3,r3,-4
	beq	4f
3:	lwzu	r4,4(r3)
	lwzux	r0,r4,r11
	add	r0,r0,r11
	stw	r10,0(r3)
	stw	r0,0(r4)
	bdnz	3b
4:
clear_bss:
	/*
	 * Now clear BSS segment
	 */
	lwz	r3,GOT(__bss_start)
	lwz	r4,GOT(_end)

	cmplw	0,r3,r4
	beq	6f

	li	r0,0
5:
	stw	r0,0(r3)
	addi	r3,r3,4
	cmplw	0,r3,r4
	bne	5b
6:

	mr	r3,r9		/* Init Data pointer		*/
	mr	r4,r10		/* Destination Address		*/
	bl	board_init_r

	/*
	 * Copy exception vector code to low memory
	 *
	 * r3: dest_addr
	 * r7: source address, r8: end address, r9: target address
	 */
	.globl	trap_init
trap_init:
	lwz	r7,GOT(_start_of_vectors)
	lwz	r8,GOT(_end_of_vectors)

	li	r9,0x100		/* reset vector always at 0x100 */

	cmplw	0,r7,r8
	bgelr				/* return if r7>=r8 - just in case */

	mflr	r4			/* save link register		*/
1:
	lwz	r0,0(r7)
	stw	r0,0(r9)
	addi	r7,r7,4
	addi	r9,r9,4
	cmplw	0,r7,r8
	bne	1b

	/*
	 * relocate `hdlr' and `int_return' entries
	 */
	li	r7,.L_CriticalInput - _start + _START_OFFSET
	bl	trap_reloc
	li	r7,.L_MachineCheck - _start + _START_OFFSET
	bl	trap_reloc
	li	r7,.L_DataStorage - _start + _START_OFFSET
	bl	trap_reloc
	li	r7,.L_InstStorage - _start + _START_OFFSET
	bl	trap_reloc
	li	r7,.L_ExtInterrupt - _start + _START_OFFSET
	bl	trap_reloc
	li	r7,.L_Alignment - _start + _START_OFFSET
	bl	trap_reloc
	li	r7,.L_ProgramCheck - _start + _START_OFFSET
	bl	trap_reloc
	li	r7,.L_FPUnavailable - _start + _START_OFFSET
	bl	trap_reloc
	li	r7,.L_Decrementer - _start + _START_OFFSET
	bl	trap_reloc
	li	r7,.L_IntervalTimer - _start + _START_OFFSET
	li	r8,_end_of_vectors - _start + _START_OFFSET
2:
	bl	trap_reloc
	addi	r7,r7,0x100		/* next exception vector	*/
	cmplw	0,r7,r8
	blt	2b

	lis	r7,0x0
	mtspr	IVPR,r7

	mtlr	r4			/* restore link register	*/
	blr

	/*
	 * Function: relocate entries for one exception vector
	 */
trap_reloc:
	lwz	r0,0(r7)		/* hdlr ...			*/
	add	r0,r0,r3		/*  ... += dest_addr		*/
	stw	r0,0(r7)

	lwz	r0,4(r7)		/* int_return ...		*/
	add	r0,r0,r3		/*  ... += dest_addr		*/
	stw	r0,4(r7)

	blr

#ifdef CFG_INIT_RAM_LOCK
.globl unlock_ram_in_cache
unlock_ram_in_cache:
	/* invalidate the INIT_RAM section */
	lis	r3,(CFG_INIT_RAM_ADDR & ~31)@h
	ori	r3,r3,(CFG_INIT_RAM_ADDR & ~31)@l
	li	r4,(CFG_DCACHE_SIZE / (2 * CFG_CACHELINE_SIZE)) 
	mtctr	r4
1:	icbi	r0,r3
	dcbi	r0,r3
	addi	r3,r3,CFG_CACHELINE_SIZE
	bdnz	1b
	sync			/* Wait for all icbi to complete on bus */
	isync
	blr
#endif