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1/*
2 * linux/arch/arm/mm/cache-v7.S
3 *
4 * Copyright (C) 2001 Deep Blue Solutions Ltd.
5 * Copyright (C) 2005 ARM Ltd.
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6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This is the "shell" of the ARMv7 processor support.
12 */
13#include <linux/linkage.h>
14#include <linux/init.h>
0c549ba1 15#include "assembler.h"
5db3fe53 16#include <asm/unwind.h>
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17
18#include "proc-macros.S"
19
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20/*
21 * v7_flush_icache_all()
22 *
23 * Flush the whole I-cache.
24 *
25 * Registers:
26 * r0 - set to 0
27 */
28ENTRY(v7_flush_icache_all)
29 mov r0, #0
30 ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
31 ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
32 mov pc, lr
33ENDPROC(v7_flush_icache_all)
34
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35/*
36 * v7_flush_dcache_all()
37 *
38 * Flush the whole D-cache.
39 *
5db3fe53 40 * Corrupted registers: r0-r7, r9-r11 (r6 only in Thumb mode)
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41 *
42 * - mm - mm_struct describing address space
43 */
44ENTRY(v7_flush_dcache_all)
45 dmb @ ensure ordering with previous memory accesses
46 mrc p15, 1, r0, c0, c0, 1 @ read clidr
47 ands r3, r0, #0x7000000 @ extract loc from clidr
48 mov r3, r3, lsr #23 @ left align loc bit field
49 beq finished @ if loc is 0, then no need to clean
50 mov r10, #0 @ start clean at cache level 0
51loop1:
52 add r2, r10, r10, lsr #1 @ work out 3x current cache level
53 mov r1, r0, lsr r2 @ extract cache type bits from clidr
54 and r1, r1, #7 @ mask of the bits for current cache only
55 cmp r1, #2 @ see what cache we have at this level
56 blt skip @ skip if no cache, or just i-cache
57 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
58 isb @ isb to sych the new cssr&csidr
59 mrc p15, 1, r1, c0, c0, 0 @ read the new csidr
60 and r2, r1, #7 @ extract the length of the cache lines
61 add r2, r2, #4 @ add 4 (line length offset)
62 ldr r4, =0x3ff
63 ands r4, r4, r1, lsr #3 @ find maximum number on the way size
64 clz r5, r4 @ find bit position of way size increment
65 ldr r7, =0x7fff
66 ands r7, r7, r1, lsr #13 @ extract max number of the index size
67loop2:
68 mov r9, r4 @ create working copy of max way size
69loop3:
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70 ARM( orr r11, r10, r9, lsl r5 ) @ factor way and cache number into r11
71 THUMB( lsl r6, r9, r5 )
72 THUMB( orr r11, r10, r6 ) @ factor way and cache number into r11
73 ARM( orr r11, r11, r7, lsl r2 ) @ factor index number into r11
74 THUMB( lsl r6, r7, r2 )
75 THUMB( orr r11, r11, r6 ) @ factor index number into r11
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76 mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way
77 subs r9, r9, #1 @ decrement the way
78 bge loop3
79 subs r7, r7, #1 @ decrement the index
80 bge loop2
81skip:
82 add r10, r10, #2 @ increment cache number
83 cmp r3, r10
84 bgt loop1
85finished:
86 mov r10, #0 @ swith back to cache level 0
87 mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr
88 dsb
89 isb
90 mov pc, lr
91ENDPROC(v7_flush_dcache_all)
92
93/*
94 * v7_flush_cache_all()
95 *
96 * Flush the entire cache system.
97 * The data cache flush is now achieved using atomic clean / invalidates
98 * working outwards from L1 cache. This is done using Set/Way based cache
0c549ba1 99 * maintenance instructions.
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100 * The instruction cache can still be invalidated back to the point of
101 * unification in a single instruction.
102 *
103 */
104ENTRY(v7_flush_kern_cache_all)
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105 ARM( stmfd sp!, {r4-r5, r7, r9-r11, lr} )
106 THUMB( stmfd sp!, {r4-r7, r9-r11, lr} )
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107 bl v7_flush_dcache_all
108 mov r0, #0
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109 ALT_SMP(mcr p15, 0, r0, c7, c1, 0) @ invalidate I-cache inner shareable
110 ALT_UP(mcr p15, 0, r0, c7, c5, 0) @ I+BTB cache invalidate
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111 ARM( ldmfd sp!, {r4-r5, r7, r9-r11, lr} )
112 THUMB( ldmfd sp!, {r4-r7, r9-r11, lr} )
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113 mov pc, lr
114ENDPROC(v7_flush_kern_cache_all)
115
116/*
117 * v7_flush_cache_all()
118 *
119 * Flush all TLB entries in a particular address space
120 *
121 * - mm - mm_struct describing address space
122 */
123ENTRY(v7_flush_user_cache_all)
124 /*FALLTHROUGH*/
125
126/*
127 * v7_flush_cache_range(start, end, flags)
128 *
129 * Flush a range of TLB entries in the specified address space.
130 *
131 * - start - start address (may not be aligned)
132 * - end - end address (exclusive, may not be aligned)
133 * - flags - vm_area_struct flags describing address space
134 *
135 * It is assumed that:
136 * - we have a VIPT cache.
137 */
138ENTRY(v7_flush_user_cache_range)
139 mov pc, lr
140ENDPROC(v7_flush_user_cache_all)
141ENDPROC(v7_flush_user_cache_range)
142
143/*
144 * v7_coherent_kern_range(start,end)
145 *
146 * Ensure that the I and D caches are coherent within specified
147 * region. This is typically used when code has been written to
148 * a memory region, and will be executed.
149 *
150 * - start - virtual start address of region
151 * - end - virtual end address of region
152 *
153 * It is assumed that:
154 * - the Icache does not read data from the write buffer
155 */
156ENTRY(v7_coherent_kern_range)
157 /* FALLTHROUGH */
158
159/*
160 * v7_coherent_user_range(start,end)
161 *
162 * Ensure that the I and D caches are coherent within specified
163 * region. This is typically used when code has been written to
164 * a memory region, and will be executed.
165 *
166 * - start - virtual start address of region
167 * - end - virtual end address of region
168 *
169 * It is assumed that:
170 * - the Icache does not read data from the write buffer
171 */
172ENTRY(v7_coherent_user_range)
5db3fe53 173 UNWIND(.fnstart )
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174 dcache_line_size r2, r3
175 sub r3, r2, #1
0c549ba1 176 bic r12, r0, r3
5db3fe53 1771:
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178 USER( mcr p15, 0, r12, c7, c11, 1 ) @ clean D line to the point of unification
179 add r12, r12, r2
180 cmp r12, r1
181 blo 1b
4e93cb00 182 dsb
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183 icache_line_size r2, r3
184 sub r3, r2, #1
185 bic r12, r0, r3
5db3fe53 1862:
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187 USER( mcr p15, 0, r12, c7, c5, 1 ) @ invalidate I line
188 add r12, r12, r2
189 cmp r12, r1
190 blo 2b
1913:
4e93cb00 192 mov r0, #0
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193 ALT_SMP(mcr p15, 0, r0, c7, c1, 6) @ invalidate BTB Inner Shareable
194 ALT_UP(mcr p15, 0, r0, c7, c5, 6) @ invalidate BTB
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195 dsb
196 isb
197 mov pc, lr
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198
199/*
200 * Fault handling for the cache operation above. If the virtual address in r0
201 * isn't mapped, just try the next page.
202 */
2039001:
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204 mov r12, r12, lsr #12
205 mov r12, r12, lsl #12
206 add r12, r12, #4096
207 b 3b
5db3fe53 208 UNWIND(.fnend )
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209ENDPROC(v7_coherent_kern_range)
210ENDPROC(v7_coherent_user_range)
211
212/*
0c549ba1 213 * v7_flush_kern_dcache_area(void *addr, size_t size)
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214 *
215 * Ensure that the data held in the page kaddr is written back
216 * to the page in question.
217 *
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218 * - addr - kernel address
219 * - size - region size
4e93cb00 220 */
0c549ba1 221ENTRY(v7_flush_kern_dcache_area)
4e93cb00 222 dcache_line_size r2, r3
0c549ba1 223 add r1, r0, r1
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2241:
225 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line / unified line
226 add r0, r0, r2
227 cmp r0, r1
228 blo 1b
229 dsb
230 mov pc, lr
0c549ba1 231ENDPROC(v7_flush_kern_dcache_area)
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232
233/*
234 * v7_dma_inv_range(start,end)
235 *
236 * Invalidate the data cache within the specified region; we will
237 * be performing a DMA operation in this region and we want to
238 * purge old data in the cache.
239 *
240 * - start - virtual start address of region
241 * - end - virtual end address of region
242 */
0c549ba1 243v7_dma_inv_range:
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244 dcache_line_size r2, r3
245 sub r3, r2, #1
246 tst r0, r3
247 bic r0, r0, r3
248 mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
249
250 tst r1, r3
251 bic r1, r1, r3
252 mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D / U line
2531:
254 mcr p15, 0, r0, c7, c6, 1 @ invalidate D / U line
255 add r0, r0, r2
256 cmp r0, r1
257 blo 1b
258 dsb
259 mov pc, lr
260ENDPROC(v7_dma_inv_range)
261
262/*
263 * v7_dma_clean_range(start,end)
264 * - start - virtual start address of region
265 * - end - virtual end address of region
266 */
0c549ba1 267v7_dma_clean_range:
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268 dcache_line_size r2, r3
269 sub r3, r2, #1
270 bic r0, r0, r3
2711:
272 mcr p15, 0, r0, c7, c10, 1 @ clean D / U line
273 add r0, r0, r2
274 cmp r0, r1
275 blo 1b
276 dsb
277 mov pc, lr
278ENDPROC(v7_dma_clean_range)
279
280/*
281 * v7_dma_flush_range(start,end)
282 * - start - virtual start address of region
283 * - end - virtual end address of region
284 */
285ENTRY(v7_dma_flush_range)
286 dcache_line_size r2, r3
287 sub r3, r2, #1
288 bic r0, r0, r3
2891:
290 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line
291 add r0, r0, r2
292 cmp r0, r1
293 blo 1b
294 dsb
295 mov pc, lr
296ENDPROC(v7_dma_flush_range)
297
298 __INITDATA
299
300 .type v7_cache_fns, #object
301ENTRY(v7_cache_fns)
0c549ba1 302 .long v7_flush_icache_all
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303 .long v7_flush_kern_cache_all
304 .long v7_flush_user_cache_all
305 .long v7_flush_user_cache_range
306 .long v7_coherent_kern_range
307 .long v7_coherent_user_range
0c549ba1 308 .long v7_flush_kern_dcache_area
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309 .long v7_dma_flush_range
310 .size v7_cache_fns, . - v7_cache_fns
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