aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mm/proc-arm6_7.S
blob: e7be700db08c4c27ed425ef73d9783a03586e568 (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
/*
 *  linux/arch/arm/mm/proc-arm6,7.S
 *
 *  Copyright (C) 1997-2000 Russell King
 *  hacked for non-paged-MM by Hyok S. Choi, 2003.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  These are the low level assembler for performing cache and TLB
 *  functions on the ARM610 & ARM710.
 */
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/hwcap.h>
#include <asm/pgtable-hwdef.h>
#include <asm/pgtable.h>
#include <asm/ptrace.h>

#include "proc-macros.S"

ENTRY(cpu_arm6_dcache_clean_area)
ENTRY(cpu_arm7_dcache_clean_area)
		mov	pc, lr

/*
 * Function: arm6_7_data_abort ()
 *
 * Params  : r4 = aborted context pc
 *	   : r5 = aborted context psr
 *
 * Purpose : obtain information about current aborted instruction
 *
 * Returns : r0 = address of abort
 *	   : r1 = FSR
 */

ENTRY(cpu_arm7_data_abort)
	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
	ldr	r8, [r4]			@ read arm instruction
	tst	r8, #1 << 20			@ L = 0 -> write?
	orreq	r1, r1, #1 << 11		@ yes.
	and	r7, r8, #15 << 24
	add	pc, pc, r7, lsr #22		@ Now branch to the relevant processing routine
	nop

/* 0 */	b	.data_unknown
/* 1 */	mov	pc, lr				@ swp
/* 2 */	b	.data_unknown
/* 3 */	b	.data_unknown
/* 4 */	b	.data_arm_lateldrpostconst	@ ldr	rd, [rn], #m
/* 5 */	b	.data_arm_lateldrpreconst	@ ldr	rd, [rn, #m]
/* 6 */	b	.data_arm_lateldrpostreg	@ ldr	rd, [rn], rm
/* 7 */	b	.data_arm_lateldrprereg		@ ldr	rd, [rn, rm]
/* 8 */	b	.data_arm_ldmstm		@ ldm*a	rn, <rlist>
/* 9 */	b	.data_arm_ldmstm		@ ldm*b	rn, <rlist>
/* a */	b	.data_unknown
/* b */	b	.data_unknown
/* c */	mov	pc, lr				@ ldc	rd, [rn], #m	@ Same as ldr	rd, [rn], #m
/* d */	mov	pc, lr				@ ldc	rd, [rn, #m]
/* e */	b	.data_unknown
/* f */
.data_unknown:	@ Part of jumptable
	mov	r0, r4
	mov	r1, r8
	mov	r2, sp
	bl	baddataabort
	b	ret_from_exception

ENTRY(cpu_arm6_data_abort)
	mrc	p15, 0, r1, c5, c0, 0		@ get FSR
	mrc	p15, 0, r0, c6, c0, 0		@ get FAR
	ldr	r8, [r4]			@ read arm instruction
	tst	r8, #1 << 20			@ L = 0 -> write?
	orreq	r1, r1, #1 << 11		@ yes.
	and	r7, r8, #14 << 24
	teq	r7, #8 << 24			@ was it ldm/stm
	movne	pc, lr

.data_arm_ldmstm:
	tst	r8, #1 << 21			@ check writeback bit
	moveq	pc, lr				@ no writeback -> no fixup
	mov	r7, #0x11
	orr	r7, r7, #0x1100
	and	r6, r8, r7
	and	r2, r8, r7, lsl #1
	add	r6, r6, r2, lsr #1
	and	r2, r8, r7, lsl #2
	add	r6, r6, r2, lsr #2
	and	r2, r8, r7, lsl #3
	add	r6, r6, r2, lsr #3
	add	r6, r6, r6, lsr #8
	add	r6, r6, r6, lsr #4
	and	r6, r6, #15			@ r6 = no. of registers to transfer.
	and	r5, r8, #15 << 16		@ Extract 'n' from instruction
	ldr	r7, [sp, r5, lsr #14]		@ Get register 'Rn'
	tst	r8, #1 << 23			@ Check U bit
	subne	r7, r7, r6, lsl #2		@ Undo increment
	addeq	r7, r7, r6, lsl #2		@ Undo decrement
	str	r7, [sp, r5, lsr #14]		@ Put register 'Rn'
	mov	pc, lr

.data_arm_apply_r6_and_rn:
	and	r5, r8, #15 << 16		@ Extract 'n' from instruction
	ldr	r7, [sp, r5, lsr #14]		@ Get register 'Rn'
	tst	r8, #1 << 23			@ Check U bit
	subne	r7, r7, r6			@ Undo incrmenet
	addeq	r7, r7, r6			@ Undo decrement
	str	r7, [sp, r5, lsr #14]		@ Put register 'Rn'
	mov	pc, lr

.data_arm_lateldrpreconst:
	tst	r8, #1 << 21			@ check writeback bit
	moveq	pc, lr				@ no writeback -> no fixup
.data_arm_lateldrpostconst:
	movs	r2, r8, lsl #20			@ Get offset
	moveq	pc, lr				@ zero -> no fixup
	and	r5, r8, #15 << 16		@ Extract 'n' from instruction
	ldr	r7, [sp, r5, lsr #14]		@ Get register 'Rn'
	tst	r8, #1 << 23			@ Check U bit
	subne	r7, r7, r2, lsr #20		@ Undo increment
	addeq	r7, r7, r2, lsr #20		@ Undo decrement
	str	r7, [sp, r5, lsr #14]		@ Put register 'Rn'
	mov	pc, lr

.data_arm_lateldrprereg:
	tst	r8, #1 << 21			@ check writeback bit
	moveq	pc, lr				@ no writeback -> no fixup
.data_arm_lateldrpostreg:
	and	r7, r8, #15			@ Extract 'm' from instruction
	ldr	r6, [sp, r7, lsl #2]		@ Get register 'Rm'
	mov	r5, r8, lsr #7			@ get shift count
	ands	r5, r5, #31
	and	r7, r8, #0x70			@ get shift type
	orreq	r7, r7, #8			@ shift count = 0
	add	pc, pc, r7
	nop

	mov	r6, r6, lsl r5			@ 0: LSL #!0
	b	.data_arm_apply_r6_and_rn
	b	.data_arm_apply_r6_and_rn	@ 1: LSL #0
	nop
	b	.data_unknown			@ 2: MUL?
	nop
	b	.data_unknown			@ 3: MUL?
	nop
	mov	r6, r6, lsr r5			@ 4: LSR #!0
	b	.data_arm_apply_r6_and_rn
	mov	r6, r6, lsr #32			@ 5: LSR #32
	b	.data_arm_apply_r6_and_rn
	b	.data_unknown			@ 6: MUL?
	nop
	b	.data_unknown			@ 7: MUL?
	nop
	mov	r6, r6, asr r5			@ 8: ASR #!0
	b	.data_arm_apply_r6_and_rn
	mov	r6, r6, asr #32			@ 9: ASR #32
	b	.data_arm_apply_r6_and_rn
	b	.data_unknown			@ A: MUL?
	nop
	b	.data_unknown			@ B: MUL?
	nop
	mov	r6, r6, ror r5			@ C: ROR #!0
	b	.data_arm_apply_r6_and_rn
	mov	r6, r6, rrx			@ D: RRX
	b	.data_arm_apply_r6_and_rn
	b	.data_unknown			@ E: MUL?
	nop
	b	.data_unknown			@ F: MUL?

/*
 * Function: arm6_7_proc_init (void)
 *	   : arm6_7_proc_fin (void)
 *
 * Notes   : This processor does not require these
 */
ENTRY(cpu_arm6_proc_init)
ENTRY(cpu_arm7_proc_init)
		mov	pc, lr

ENTRY(cpu_arm6_proc_fin)
ENTRY(cpu_arm7_proc_fin)
		mov	r0, #0x31			@ ....S..DP...M
		mcr	p15, 0, r0, c1, c0, 0		@ disable caches
		mov	pc, lr

ENTRY(cpu_arm6_do_idle)
ENTRY(cpu_arm7_do_idle)
		mov	pc, lr

/*
 * Function: arm6_7_switch_mm(unsigned long pgd_phys)
 * Params  : pgd_phys	Physical address of page table
 * Purpose : Perform a task switch, saving the old processes state, and restoring
 *	     the new.
 */
ENTRY(cpu_arm6_switch_mm)
ENTRY(cpu_arm7_switch_mm)
#ifdef CONFIG_MMU
		mov	r1, #0
		mcr	p15, 0, r1, c7, c0, 0		@ flush cache
		mcr	p15, 0, r0, c2, c0, 0		@ update page table ptr
		mcr	p15, 0, r1, c5, c0, 0		@ flush TLBs
#endif
		mov	pc, lr

/*
 * Function: arm6_7_set_pte_ext(pte_t *ptep, pte_t pte, unsigned int ext)
 * Params  : r0 = Address to set
 *	   : r1 = value to set
 * Purpose : Set a PTE and flush it out of any WB cache
 */
	.align	5
ENTRY(cpu_arm6_set_pte_ext)
ENTRY(cpu_arm7_set_pte_ext)
#ifdef CONFIG_MMU
	armv3_set_pte_ext wc_disable=0
#endif /* CONFIG_MMU */
	mov	pc, lr

/*
 * Function: _arm6_7_reset
 * Params  : r0 = address to jump to
 * Notes   : This sets up everything for a reset
 */
ENTRY(cpu_arm6_reset)
ENTRY(cpu_arm7_reset)
		mov	r1, #0
		mcr	p15, 0, r1, c7, c0, 0		@ flush cache
#ifdef CONFIG_MMU
		mcr	p15, 0, r1, c5, c0, 0		@ flush TLB
#endif
		mov	r1, #0x30
		mcr	p15, 0, r1, c1, c0, 0		@ turn off MMU etc
		mov	pc, r0

		__CPUINIT

		.type	__arm6_setup, #function
__arm6_setup:	mov	r0, #0
		mcr	p15, 0, r0, c7, c0		@ flush caches on v3
#ifdef CONFIG_MMU
		mcr	p15, 0, r0, c5, c0		@ flush TLBs on v3
		mov	r0, #0x3d			@ . ..RS BLDP WCAM
		orr	r0, r0, #0x100			@ . ..01 0011 1101
#else
		mov	r0, #0x3c			@ . ..RS BLDP WCA.
#endif
		mov	pc, lr
		.size	__arm6_setup, . - __arm6_setup

		.type	__arm7_setup, #function
__arm7_setup:	mov	r0, #0
		mcr	p15, 0, r0, c7, c0		@ flush caches on v3
#ifdef CONFIG_MMU
		mcr	p15, 0, r0, c5, c0		@ flush TLBs on v3
		mcr	p15, 0, r0, c3, c0		@ load domain access register
		mov	r0, #0x7d			@ . ..RS BLDP WCAM
		orr	r0, r0, #0x100			@ . ..01 0111 1101
#else
		mov	r0, #0x7c			@ . ..RS BLDP WCA.
#endif
		mov	pc, lr
		.size	__arm7_setup, . - __arm7_setup

		__INITDATA

/*
 * Purpose : Function pointers used to access above functions - all calls
 *	     come through these
 */
		.type	arm6_processor_functions, #object
ENTRY(arm6_processor_functions)
		.word	cpu_arm6_data_abort
		.word	legacy_pabort
		.word	cpu_arm6_proc_init
		.word	cpu_arm6_proc_fin
		.word	cpu_arm6_reset
		.word	cpu_arm6_do_idle
		.word	cpu_arm6_dcache_clean_area
		.word	cpu_arm6_switch_mm
		.word	cpu_arm6_set_pte_ext
		.word	0
		.word	0
		.word	0
		.size	arm6_processor_functions, . - arm6_processor_functions

/*
 * Purpose : Function pointers used to access above functions - all calls
 *	     come through these
 */
		.type	arm7_processor_functions, #object
ENTRY(arm7_processor_functions)
		.word	cpu_arm7_data_abort
		.word	legacy_pabort
		.word	cpu_arm7_proc_init
		.word	cpu_arm7_proc_fin
		.word	cpu_arm7_reset
		.word	cpu_arm7_do_idle
		.word	cpu_arm7_dcache_clean_area
		.word	cpu_arm7_switch_mm
		.word	cpu_arm7_set_pte_ext
		.word	0
		.word	0
		.word	0
		.size	arm7_processor_functions, . - arm7_processor_functions

		.section ".rodata"

		.type	cpu_arch_name, #object
cpu_arch_name:	.asciz	"armv3"
		.size	cpu_arch_name, . - cpu_arch_name

		.type	cpu_elf_name, #object
cpu_elf_name:	.asciz	"v3"
		.size	cpu_elf_name, . - cpu_elf_name

		.type	cpu_arm6_name, #object
cpu_arm6_name:	.asciz	"ARM6"
		.size	cpu_arm6_name, . - cpu_arm6_name

		.type	cpu_arm610_name, #object
cpu_arm610_name:
		.asciz	"ARM610"
		.size	cpu_arm610_name, . - cpu_arm610_name

		.type	cpu_arm7_name, #object
cpu_arm7_name:	.asciz	"ARM7"
		.size	cpu_arm7_name, . - cpu_arm7_name

		.type	cpu_arm710_name, #object
cpu_arm710_name:
		.asciz	"ARM710"
		.size	cpu_arm710_name, . - cpu_arm710_name

		.align

		.section ".proc.info.init", #alloc, #execinstr

		.type	__arm6_proc_info, #object
__arm6_proc_info:
		.long	0x41560600
		.long	0xfffffff0
		.long	0x00000c1e
		.long   PMD_TYPE_SECT | \
			PMD_BIT4 | \
			PMD_SECT_AP_WRITE | \
			PMD_SECT_AP_READ
		b	__arm6_setup
		.long	cpu_arch_name
		.long	cpu_elf_name
		.long	HWCAP_SWP | HWCAP_26BIT
		.long	cpu_arm6_name
		.long	arm6_processor_functions
		.long	v3_tlb_fns
		.long	v3_user_fns
		.long	v3_cache_fns
		.size	__arm6_proc_info, . - __arm6_proc_info

		.type	__arm610_proc_info, #object
__arm610_proc_info:
		.long	0x41560610
		.long	0xfffffff0
		.long	0x00000c1e
		.long   PMD_TYPE_SECT | \
			PMD_BIT4 | \
			PMD_SECT_AP_WRITE | \
			PMD_SECT_AP_READ
		b	__arm6_setup
		.long	cpu_arch_name
		.long	cpu_elf_name
		.long	HWCAP_SWP | HWCAP_26BIT
		.long	cpu_arm610_name
		.long	arm6_processor_functions
		.long	v3_tlb_fns
		.long	v3_user_fns
		.long	v3_cache_fns
		.size	__arm610_proc_info, . - __arm610_proc_info

		.type	__arm7_proc_info, #object
__arm7_proc_info:
		.long	0x41007000
		.long	0xffffff00
		.long	0x00000c1e
		.long   PMD_TYPE_SECT | \
			PMD_BIT4 | \
			PMD_SECT_AP_WRITE | \
			PMD_SECT_AP_READ
		b	__arm7_setup
		.long	cpu_arch_name
		.long	cpu_elf_name
		.long	HWCAP_SWP | HWCAP_26BIT
		.long	cpu_arm7_name
		.long	arm7_processor_functions
		.long	v3_tlb_fns
		.long	v3_user_fns
		.long	v3_cache_fns
		.size	__arm7_proc_info, . - __arm7_proc_info

		.type	__arm710_proc_info, #object
__arm710_proc_info:
		.long	0x41007100
		.long	0xfff8ff00
		.long   PMD_TYPE_SECT | \
			PMD_SECT_BUFFERABLE | \
			PMD_SECT_CACHEABLE | \
			PMD_BIT4 | \
			PMD_SECT_AP_WRITE | \
			PMD_SECT_AP_READ
		.long   PMD_TYPE_SECT | \
			PMD_BIT4 | \
			PMD_SECT_AP_WRITE | \
			PMD_SECT_AP_READ
		b	__arm7_setup
		.long	cpu_arch_name
		.long	cpu_elf_name
		.long	HWCAP_SWP | HWCAP_26BIT
		.long	cpu_arm710_name
		.long	arm7_processor_functions
		.long	v3_tlb_fns
		.long	v3_user_fns
		.long	v3_cache_fns
		.size	__arm710_proc_info, . - __arm710_proc_info