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1/*
2 * arch/xtensa/mm/misc.S
3 *
4 * Miscellaneous assembly functions.
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 *
10 * Copyright (C) 2001 - 2005 Tensilica Inc.
11 *
12 * Chris Zankel <chris@zankel.net>
13 */
14
15/* Note: we might want to implement some of the loops as zero-overhead-loops,
16 * where applicable and if supported by the processor.
17 */
18
19#include <linux/linkage.h>
20#include <asm/page.h>
21#include <asm/pgtable.h>
22
23#include <xtensa/cacheasm.h>
24#include <xtensa/cacheattrasm.h>
25
26/* clear_page (page) */
27
28ENTRY(clear_page)
29 entry a1, 16
30 addi a4, a2, PAGE_SIZE
31 movi a3, 0
32
331: s32i a3, a2, 0
34 s32i a3, a2, 4
35 s32i a3, a2, 8
36 s32i a3, a2, 12
37 s32i a3, a2, 16
38 s32i a3, a2, 20
39 s32i a3, a2, 24
40 s32i a3, a2, 28
41 addi a2, a2, 32
42 blt a2, a4, 1b
43
44 retw
45
46/*
47 * copy_page (void *to, void *from)
48 * a2 a3
49 */
50
51ENTRY(copy_page)
52 entry a1, 16
53 addi a4, a2, PAGE_SIZE
54
551: l32i a5, a3, 0
56 l32i a6, a3, 4
57 l32i a7, a3, 8
58 s32i a5, a2, 0
59 s32i a6, a2, 4
60 s32i a7, a2, 8
61 l32i a5, a3, 12
62 l32i a6, a3, 16
63 l32i a7, a3, 20
64 s32i a5, a2, 12
65 s32i a6, a2, 16
66 s32i a7, a2, 20
67 l32i a5, a3, 24
68 l32i a6, a3, 28
69 s32i a5, a2, 24
70 s32i a6, a2, 28
71 addi a2, a2, 32
72 addi a3, a3, 32
73 blt a2, a4, 1b
74
75 retw
76
77
78/*
79 * void __flush_invalidate_cache_all(void)
80 */
81
82ENTRY(__flush_invalidate_cache_all)
83 entry sp, 16
84 dcache_writeback_inv_all a2, a3
85 icache_invalidate_all a2, a3
86 retw
87
88/*
89 * void __invalidate_icache_all(void)
90 */
91
92ENTRY(__invalidate_icache_all)
93 entry sp, 16
94 icache_invalidate_all a2, a3
95 retw
96
97/*
98 * void __flush_invalidate_dcache_all(void)
99 */
100
101ENTRY(__flush_invalidate_dcache_all)
102 entry sp, 16
103 dcache_writeback_inv_all a2, a3
104 retw
105
106
107/*
108 * void __flush_invalidate_cache_range(ulong start, ulong size)
109 */
110
111ENTRY(__flush_invalidate_cache_range)
112 entry sp, 16
113 mov a4, a2
114 mov a5, a3
115 dcache_writeback_inv_region a4, a5, a6
116 icache_invalidate_region a2, a3, a4
117 retw
118
119/*
120 * void __invalidate_icache_page(ulong start)
121 */
122
123ENTRY(__invalidate_icache_page)
124 entry sp, 16
125 movi a3, PAGE_SIZE
126 icache_invalidate_region a2, a3, a4
127 retw
128
129/*
130 * void __invalidate_dcache_page(ulong start)
131 */
132
133ENTRY(__invalidate_dcache_page)
134 entry sp, 16
135 movi a3, PAGE_SIZE
136 dcache_invalidate_region a2, a3, a4
137 retw
138
139/*
140 * void __invalidate_icache_range(ulong start, ulong size)
141 */
142
143ENTRY(__invalidate_icache_range)
144 entry sp, 16
145 icache_invalidate_region a2, a3, a4
146 retw
147
148/*
149 * void __invalidate_dcache_range(ulong start, ulong size)
150 */
151
152ENTRY(__invalidate_dcache_range)
153 entry sp, 16
154 dcache_invalidate_region a2, a3, a4
155 retw
156
157/*
158 * void __flush_dcache_page(ulong start)
159 */
160
161ENTRY(__flush_dcache_page)
162 entry sp, 16
163 movi a3, PAGE_SIZE
164 dcache_writeback_region a2, a3, a4
165 retw
166
167/*
168 * void __flush_invalidate_dcache_page(ulong start)
169 */
170
171ENTRY(__flush_invalidate_dcache_page)
172 entry sp, 16
173 movi a3, PAGE_SIZE
174 dcache_writeback_inv_region a2, a3, a4
175 retw
176
177/*
178 * void __flush_invalidate_dcache_range(ulong start, ulong size)
179 */
180
181ENTRY(__flush_invalidate_dcache_range)
182 entry sp, 16
183 dcache_writeback_inv_region a2, a3, a4
184 retw
185
186/*
187 * void __invalidate_dcache_all(void)
188 */
189
190ENTRY(__invalidate_dcache_all)
191 entry sp, 16
192 dcache_invalidate_all a2, a3
193 retw
194
195/*
196 * void __flush_invalidate_dcache_page_phys(ulong start)
197 */
198
199ENTRY(__flush_invalidate_dcache_page_phys)
200 entry sp, 16
201
202 movi a3, XCHAL_DCACHE_SIZE
203 movi a4, PAGE_MASK | 1
204 addi a2, a2, 1
205
2061: addi a3, a3, -XCHAL_DCACHE_LINESIZE
207
208 ldct a6, a3
209 dsync
210 and a6, a6, a4
211 beq a6, a2, 2f
212 bgeui a3, 2, 1b
213 retw
214
2152: diwbi a3, 0
216 bgeui a3, 2, 1b
217 retw
218
219ENTRY(check_dcache_low0)
220 entry sp, 16
221
222 movi a3, XCHAL_DCACHE_SIZE / 4
223 movi a4, PAGE_MASK | 1
224 addi a2, a2, 1
225
2261: addi a3, a3, -XCHAL_DCACHE_LINESIZE
227
228 ldct a6, a3
229 dsync
230 and a6, a6, a4
231 beq a6, a2, 2f
232 bgeui a3, 2, 1b
233 retw
234
2352: j 2b
236
237ENTRY(check_dcache_high0)
238 entry sp, 16
239
240 movi a5, XCHAL_DCACHE_SIZE / 4
241 movi a3, XCHAL_DCACHE_SIZE / 2
242 movi a4, PAGE_MASK | 1
243 addi a2, a2, 1
244
2451: addi a3, a3, -XCHAL_DCACHE_LINESIZE
246 addi a5, a5, -XCHAL_DCACHE_LINESIZE
247
248 ldct a6, a3
249 dsync
250 and a6, a6, a4
251 beq a6, a2, 2f
252 bgeui a5, 2, 1b
253 retw
254
2552: j 2b
256
257ENTRY(check_dcache_low1)
258 entry sp, 16
259
260 movi a5, XCHAL_DCACHE_SIZE / 4
261 movi a3, XCHAL_DCACHE_SIZE * 3 / 4
262 movi a4, PAGE_MASK | 1
263 addi a2, a2, 1
264
2651: addi a3, a3, -XCHAL_DCACHE_LINESIZE
266 addi a5, a5, -XCHAL_DCACHE_LINESIZE
267
268 ldct a6, a3
269 dsync
270 and a6, a6, a4
271 beq a6, a2, 2f
272 bgeui a5, 2, 1b
273 retw
274
2752: j 2b
276
277ENTRY(check_dcache_high1)
278 entry sp, 16
279
280 movi a5, XCHAL_DCACHE_SIZE / 4
281 movi a3, XCHAL_DCACHE_SIZE
282 movi a4, PAGE_MASK | 1
283 addi a2, a2, 1
284
2851: addi a3, a3, -XCHAL_DCACHE_LINESIZE
286 addi a5, a5, -XCHAL_DCACHE_LINESIZE
287
288 ldct a6, a3
289 dsync
290 and a6, a6, a4
291 beq a6, a2, 2f
292 bgeui a5, 2, 1b
293 retw
294
2952: j 2b
296
297
298/*
299 * void __invalidate_icache_page_phys(ulong start)
300 */
301
302ENTRY(__invalidate_icache_page_phys)
303 entry sp, 16
304
305 movi a3, XCHAL_ICACHE_SIZE
306 movi a4, PAGE_MASK | 1
307 addi a2, a2, 1
308
3091: addi a3, a3, -XCHAL_ICACHE_LINESIZE
310
311 lict a6, a3
312 isync
313 and a6, a6, a4
314 beq a6, a2, 2f
315 bgeui a3, 2, 1b
316 retw
317
3182: iii a3, 0
319 bgeui a3, 2, 1b
320 retw
321
322
323#if 0
324
325 movi a3, XCHAL_DCACHE_WAYS - 1
326 movi a4, PAGE_SIZE
327
3281: mov a5, a2
329 add a6, a2, a4
330
3312: diwbi a5, 0
332 diwbi a5, XCHAL_DCACHE_LINESIZE
333 diwbi a5, XCHAL_DCACHE_LINESIZE * 2
334 diwbi a5, XCHAL_DCACHE_LINESIZE * 3
335
336 addi a5, a5, XCHAL_DCACHE_LINESIZE * 4
337 blt a5, a6, 2b
338
339 addi a3, a3, -1
340 addi a2, a2, XCHAL_DCACHE_SIZE / XCHAL_DCACHE_WAYS
341 bgez a3, 1b
342
343 retw
344
345ENTRY(__invalidate_icache_page_index)
346 entry sp, 16
347
348 movi a3, XCHAL_ICACHE_WAYS - 1
349 movi a4, PAGE_SIZE
350
3511: mov a5, a2
352 add a6, a2, a4
353
3542: iii a5, 0
355 iii a5, XCHAL_ICACHE_LINESIZE
356 iii a5, XCHAL_ICACHE_LINESIZE * 2
357 iii a5, XCHAL_ICACHE_LINESIZE * 3
358
359 addi a5, a5, XCHAL_ICACHE_LINESIZE * 4
360 blt a5, a6, 2b
361
362 addi a3, a3, -1
363 addi a2, a2, XCHAL_ICACHE_SIZE / XCHAL_ICACHE_WAYS
364 bgez a3, 2b
365
366 retw
367
368#endif
369
370
371
372
373
374
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