summaryrefslogtreecommitdiffstats
path: root/kernel/arch/xtensa/mm/misc.S
blob: 11a01c3e9cea91ece949e93c0c7776bdb4826170 (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
/*
 * arch/xtensa/mm/misc.S
 *
 * Miscellaneous assembly functions.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2007 Tensilica Inc.
 *
 * Chris Zankel	<chris@zankel.net>
 */


#include <linux/linkage.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/asmmacro.h>
#include <asm/cacheasm.h>
#include <asm/tlbflush.h>


/*
 * clear_page and clear_user_page are the same for non-cache-aliased configs.
 *
 * clear_page (unsigned long page)
 *                    a2
 */

ENTRY(clear_page)

	entry	a1, 16

	movi	a3, 0
	__loopi	a2, a7, PAGE_SIZE, 32
	s32i	a3, a2, 0
	s32i	a3, a2, 4
	s32i	a3, a2, 8
	s32i	a3, a2, 12
	s32i	a3, a2, 16
	s32i	a3, a2, 20
	s32i	a3, a2, 24
	s32i	a3, a2, 28
	__endla	a2, a7, 32

	retw

ENDPROC(clear_page)

/*
 * copy_page and copy_user_page are the same for non-cache-aliased configs.
 *
 * copy_page (void *to, void *from)
 *               a2          a3
 */

ENTRY(copy_page)

	entry	a1, 16

	__loopi a2, a4, PAGE_SIZE, 32

	l32i    a8, a3, 0
	l32i    a9, a3, 4
	s32i    a8, a2, 0
	s32i    a9, a2, 4

	l32i    a8, a3, 8
	l32i    a9, a3, 12
	s32i    a8, a2, 8
	s32i    a9, a2, 12

	l32i    a8, a3, 16
	l32i    a9, a3, 20
	s32i    a8, a2, 16
	s32i    a9, a2, 20

	l32i    a8, a3, 24
	l32i    a9, a3, 28
	s32i    a8, a2, 24
	s32i    a9, a2, 28

	addi    a2, a2, 32
	addi    a3, a3, 32

	__endl  a2, a4

	retw

ENDPROC(copy_page)

#ifdef CONFIG_MMU
/*
 * If we have to deal with cache aliasing, we use temporary memory mappings
 * to ensure that the source and destination pages have the same color as
 * the virtual address. We use way 0 and 1 for temporary mappings in such cases.
 *
 * The temporary DTLB entries shouldn't be flushed by interrupts, but are
 * flushed by preemptive task switches. Special code in the 
 * fast_second_level_miss handler re-established the temporary mapping. 
 * It requires that the PPNs for the destination and source addresses are
 * in a6, and a7, respectively.
 */

/* TLB miss exceptions are treated special in the following region */

ENTRY(__tlbtemp_mapping_start)

#if (DCACHE_WAY_SIZE > PAGE_SIZE)

/*
 * clear_page_alias(void *addr, unsigned long paddr)
 *                     a2              a3
 */

ENTRY(clear_page_alias)

	entry	a1, 32

	/* Skip setting up a temporary DTLB if not aliased low page. */

	movi	a5, PAGE_OFFSET
	movi	a6, 0
	beqz	a3, 1f

	/* Setup a temporary DTLB for the addr. */

	addi	a6, a3, (PAGE_KERNEL | _PAGE_HW_WRITE)
	mov	a4, a2
	wdtlb	a6, a2
	dsync

1:	movi	a3, 0
	__loopi	a2, a7, PAGE_SIZE, 32
	s32i	a3, a2, 0
	s32i	a3, a2, 4
	s32i	a3, a2, 8
	s32i	a3, a2, 12
	s32i	a3, a2, 16
	s32i	a3, a2, 20
	s32i	a3, a2, 24
	s32i	a3, a2, 28
	__endla	a2, a7, 32

	bnez	a6, 1f
	retw

	/* We need to invalidate the temporary idtlb entry, if any. */

1:	idtlb	a4
	dsync

	retw

ENDPROC(clear_page_alias)

/*
 * copy_page_alias(void *to, void *from,
 *			a2	  a3
 *                 unsigned long to_paddr, unsigned long from_paddr)
 *	        		 a4			 a5
 */

ENTRY(copy_page_alias)

	entry	a1, 32

	/* Skip setting up a temporary DTLB for destination if not aliased. */

	movi	a6, 0
	movi	a7, 0
	beqz	a4, 1f

	/* Setup a temporary DTLB for destination. */

	addi	a6, a4, (PAGE_KERNEL | _PAGE_HW_WRITE)
	wdtlb	a6, a2
	dsync

	/* Skip setting up a temporary DTLB for source if not aliased. */

1:	beqz	a5, 1f

	/* Setup a temporary DTLB for source. */

	addi	a7, a5, PAGE_KERNEL
	addi	a8, a3, 1				# way1

	wdtlb	a7, a8
	dsync

1:	__loopi a2, a4, PAGE_SIZE, 32

	l32i    a8, a3, 0
	l32i    a9, a3, 4
	s32i    a8, a2, 0
	s32i    a9, a2, 4

	l32i    a8, a3, 8
	l32i    a9, a3, 12
	s32i    a8, a2, 8
	s32i    a9, a2, 12

	l32i    a8, a3, 16
	l32i    a9, a3, 20
	s32i    a8, a2, 16
	s32i    a9, a2, 20

	l32i    a8, a3, 24
	l32i    a9, a3, 28
	s32i    a8, a2, 24
	s32i    a9, a2, 28

	addi    a2, a2, 32
	addi    a3, a3, 32

	__endl  a2, a4

	/* We need to invalidate any temporary mapping! */

	bnez	a6, 1f
	bnez	a7, 2f
	retw

1:	addi	a2, a2, -PAGE_SIZE
	idtlb	a2
	dsync
	bnez	a7, 2f
	retw

2:	addi	a3, a3, -PAGE_SIZE+1
	idtlb	a3
	dsync

	retw

ENDPROC(copy_page_alias)

#endif

#if (DCACHE_WAY_SIZE > PAGE_SIZE)

/*
 * void __flush_invalidate_dcache_page_alias (addr, phys)
 *                                             a2    a3
 */

ENTRY(__flush_invalidate_dcache_page_alias)

	entry	sp, 16

	movi	a7, 0			# required for exception handler
	addi	a6, a3, (PAGE_KERNEL | _PAGE_HW_WRITE)
	mov	a4, a2
	wdtlb	a6, a2
	dsync

	___flush_invalidate_dcache_page a2 a3

	idtlb	a4
	dsync

	retw

ENDPROC(__flush_invalidate_dcache_page_alias)

/*
 * void __invalidate_dcache_page_alias (addr, phys)
 *                                       a2    a3
 */

ENTRY(__invalidate_dcache_page_alias)

	entry	sp, 16

	movi	a7, 0			# required for exception handler
	addi	a6, a3, (PAGE_KERNEL | _PAGE_HW_WRITE)
	mov	a4, a2
	wdtlb	a6, a2
	dsync

	___invalidate_dcache_page a2 a3

	idtlb	a4
	dsync

	retw

ENDPROC(__invalidate_dcache_page_alias)
#endif

ENTRY(__tlbtemp_mapping_itlb)

#if (ICACHE_WAY_SIZE > PAGE_SIZE)
	
ENTRY(__invalidate_icache_page_alias)

	entry	sp, 16

	addi	a6, a3, (PAGE_KERNEL_EXEC | _PAGE_HW_WRITE)
	mov	a4, a2
	witlb	a6, a2
	isync

	___invalidate_icache_page a2 a3

	iitlb	a4
	isync
	retw

ENDPROC(__invalidate_icache_page_alias)

#endif

/* End of special treatment in tlb miss exception */

ENTRY(__tlbtemp_mapping_end)

#endif /* CONFIG_MMU

/*
 * void __invalidate_icache_page(ulong start)
 */

ENTRY(__invalidate_icache_page)

	entry	sp, 16

	___invalidate_icache_page a2 a3
	isync

	retw

ENDPROC(__invalidate_icache_page)

/*
 * void __invalidate_dcache_page(ulong start)
 */

ENTRY(__invalidate_dcache_page)

	entry	sp, 16

	___invalidate_dcache_page a2 a3
	dsync

	retw

ENDPROC(__invalidate_dcache_page)

/*
 * void __flush_invalidate_dcache_page(ulong start)
 */

ENTRY(__flush_invalidate_dcache_page)

	entry	sp, 16

	___flush_invalidate_dcache_page a2 a3

	dsync
	retw

ENDPROC(__flush_invalidate_dcache_page)

/*
 * void __flush_dcache_page(ulong start)
 */

ENTRY(__flush_dcache_page)

	entry	sp, 16

	___flush_dcache_page a2 a3

	dsync
	retw

ENDPROC(__flush_dcache_page)

/*
 * void __invalidate_icache_range(ulong start, ulong size)
 */

ENTRY(__invalidate_icache_range)

	entry	sp, 16

	___invalidate_icache_range a2 a3 a4
	isync

	retw

ENDPROC(__invalidate_icache_range)

/*
 * void __flush_invalidate_dcache_range(ulong start, ulong size)
 */

ENTRY(__flush_invalidate_dcache_range)

	entry	sp, 16

	___flush_invalidate_dcache_range a2 a3 a4
	dsync

	retw

ENDPROC(__flush_invalidate_dcache_range)

/*
 * void _flush_dcache_range(ulong start, ulong size)
 */

ENTRY(__flush_dcache_range)

	entry	sp, 16

	___flush_dcache_range a2 a3 a4
	dsync

	retw

ENDPROC(__flush_dcache_range)

/*
 * void _invalidate_dcache_range(ulong start, ulong size)
 */

ENTRY(__invalidate_dcache_range)

	entry	sp, 16

	___invalidate_dcache_range a2 a3 a4

	retw

ENDPROC(__invalidate_dcache_range)

/*
 * void _invalidate_icache_all(void)
 */

ENTRY(__invalidate_icache_all)

	entry	sp, 16

	___invalidate_icache_all a2 a3
	isync

	retw

ENDPROC(__invalidate_icache_all)

/*
 * void _flush_invalidate_dcache_all(void)
 */

ENTRY(__flush_invalidate_dcache_all)

	entry	sp, 16

	___flush_invalidate_dcache_all a2 a3
	dsync

	retw

ENDPROC(__flush_invalidate_dcache_all)

/*
 * void _invalidate_dcache_all(void)
 */

ENTRY(__invalidate_dcache_all)

	entry	sp, 16

	___invalidate_dcache_all a2 a3
	dsync

	retw

ENDPROC(__invalidate_dcache_all)