Loading...
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/arch/arm/mm/cache-v6.S
4 *
5 * Copyright (C) 2001 Deep Blue Solutions Ltd.
6 *
7 * This is the "shell" of the ARMv6 processor support.
8 */
9#include <linux/linkage.h>
10#include <linux/init.h>
11#include <linux/cfi_types.h>
12#include <asm/assembler.h>
13#include <asm/errno.h>
14#include <asm/unwind.h>
15
16#include "proc-macros.S"
17
18#define HARVARD_CACHE
19#define CACHE_LINE_SIZE 32
20#define D_CACHE_LINE_SIZE 32
21#define BTB_FLUSH_SIZE 8
22
23.arch armv6
24
25/*
26 * v6_flush_icache_all()
27 *
28 * Flush the whole I-cache.
29 *
30 * ARM1136 erratum 411920 - Invalidate Instruction Cache operation can fail.
31 * This erratum is present in 1136, 1156 and 1176. It does not affect the
32 * MPCore.
33 *
34 * Registers:
35 * r0 - set to 0
36 * r1 - corrupted
37 */
38SYM_TYPED_FUNC_START(v6_flush_icache_all)
39 mov r0, #0
40#ifdef CONFIG_ARM_ERRATA_411920
41 mrs r1, cpsr
42 cpsid ifa @ disable interrupts
43 mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
44 mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
45 mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
46 mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
47 msr cpsr_cx, r1 @ restore interrupts
48 .rept 11 @ ARM Ltd recommends at least
49 nop @ 11 NOPs
50 .endr
51#else
52 mcr p15, 0, r0, c7, c5, 0 @ invalidate I-cache
53#endif
54 ret lr
55SYM_FUNC_END(v6_flush_icache_all)
56
57/*
58 * v6_flush_cache_all()
59 *
60 * Flush the entire cache.
61 *
62 * It is assumed that:
63 */
64SYM_TYPED_FUNC_START(v6_flush_kern_cache_all)
65 mov r0, #0
66#ifdef HARVARD_CACHE
67 mcr p15, 0, r0, c7, c14, 0 @ D cache clean+invalidate
68#ifndef CONFIG_ARM_ERRATA_411920
69 mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
70#else
71 b v6_flush_icache_all
72#endif
73#else
74 mcr p15, 0, r0, c7, c15, 0 @ Cache clean+invalidate
75#endif
76 ret lr
77SYM_FUNC_END(v6_flush_kern_cache_all)
78
79/*
80 * v6_flush_cache_all()
81 *
82 * Flush all TLB entries in a particular address space
83 *
84 * - mm - mm_struct describing address space
85 */
86SYM_TYPED_FUNC_START(v6_flush_user_cache_all)
87 ret lr
88SYM_FUNC_END(v6_flush_user_cache_all)
89
90/*
91 * v6_flush_cache_range(start, end, flags)
92 *
93 * Flush a range of TLB entries in the specified address space.
94 *
95 * - start - start address (may not be aligned)
96 * - end - end address (exclusive, may not be aligned)
97 * - flags - vm_area_struct flags describing address space
98 *
99 * It is assumed that:
100 * - we have a VIPT cache.
101 */
102SYM_TYPED_FUNC_START(v6_flush_user_cache_range)
103 ret lr
104SYM_FUNC_END(v6_flush_user_cache_range)
105
106/*
107 * v6_coherent_kern_range(start,end)
108 *
109 * Ensure that the I and D caches are coherent within specified
110 * region. This is typically used when code has been written to
111 * a memory region, and will be executed.
112 *
113 * - start - virtual start address of region
114 * - end - virtual end address of region
115 *
116 * It is assumed that:
117 * - the Icache does not read data from the write buffer
118 */
119SYM_TYPED_FUNC_START(v6_coherent_kern_range)
120#ifdef CONFIG_CFI_CLANG /* Fallthrough if !CFI */
121 b v6_coherent_user_range
122#endif
123SYM_FUNC_END(v6_coherent_kern_range)
124
125/*
126 * v6_coherent_user_range(start,end)
127 *
128 * Ensure that the I and D caches are coherent within specified
129 * region. This is typically used when code has been written to
130 * a memory region, and will be executed.
131 *
132 * - start - virtual start address of region
133 * - end - virtual end address of region
134 *
135 * It is assumed that:
136 * - the Icache does not read data from the write buffer
137 */
138SYM_TYPED_FUNC_START(v6_coherent_user_range)
139 UNWIND(.fnstart )
140#ifdef HARVARD_CACHE
141 bic r0, r0, #CACHE_LINE_SIZE - 1
1421:
143 USER( mcr p15, 0, r0, c7, c10, 1 ) @ clean D line
144 add r0, r0, #CACHE_LINE_SIZE
145 cmp r0, r1
146 blo 1b
147#endif
148 mov r0, #0
149#ifdef HARVARD_CACHE
150 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
151#ifndef CONFIG_ARM_ERRATA_411920
152 mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
153#else
154 b v6_flush_icache_all
155#endif
156#else
157 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB
158#endif
159 ret lr
160
161/*
162 * Fault handling for the cache operation above. If the virtual address in r0
163 * isn't mapped, fail with -EFAULT.
164 */
1659001:
166 mov r0, #-EFAULT
167 ret lr
168 UNWIND(.fnend )
169SYM_FUNC_END(v6_coherent_user_range)
170
171/*
172 * v6_flush_kern_dcache_area(void *addr, size_t size)
173 *
174 * Ensure that the data held in the page kaddr is written back
175 * to the page in question.
176 *
177 * - addr - kernel address
178 * - size - region size
179 */
180SYM_TYPED_FUNC_START(v6_flush_kern_dcache_area)
181 add r1, r0, r1
182 bic r0, r0, #D_CACHE_LINE_SIZE - 1
1831:
184#ifdef HARVARD_CACHE
185 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
186#else
187 mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate unified line
188#endif
189 add r0, r0, #D_CACHE_LINE_SIZE
190 cmp r0, r1
191 blo 1b
192#ifdef HARVARD_CACHE
193 mov r0, #0
194 mcr p15, 0, r0, c7, c10, 4
195#endif
196 ret lr
197SYM_FUNC_END(v6_flush_kern_dcache_area)
198
199/*
200 * v6_dma_inv_range(start,end)
201 *
202 * Invalidate the data cache within the specified region; we will
203 * be performing a DMA operation in this region and we want to
204 * purge old data in the cache.
205 *
206 * - start - virtual start address of region
207 * - end - virtual end address of region
208 */
209v6_dma_inv_range:
210 tst r0, #D_CACHE_LINE_SIZE - 1
211 bic r0, r0, #D_CACHE_LINE_SIZE - 1
212#ifdef HARVARD_CACHE
213 mcrne p15, 0, r0, c7, c10, 1 @ clean D line
214#else
215 mcrne p15, 0, r0, c7, c11, 1 @ clean unified line
216#endif
217 tst r1, #D_CACHE_LINE_SIZE - 1
218 bic r1, r1, #D_CACHE_LINE_SIZE - 1
219#ifdef HARVARD_CACHE
220 mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D line
221#else
222 mcrne p15, 0, r1, c7, c15, 1 @ clean & invalidate unified line
223#endif
2241:
225#ifdef HARVARD_CACHE
226 mcr p15, 0, r0, c7, c6, 1 @ invalidate D line
227#else
228 mcr p15, 0, r0, c7, c7, 1 @ invalidate unified line
229#endif
230 add r0, r0, #D_CACHE_LINE_SIZE
231 cmp r0, r1
232 blo 1b
233 mov r0, #0
234 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
235 ret lr
236
237/*
238 * v6_dma_clean_range(start,end)
239 * - start - virtual start address of region
240 * - end - virtual end address of region
241 */
242v6_dma_clean_range:
243 bic r0, r0, #D_CACHE_LINE_SIZE - 1
2441:
245#ifdef HARVARD_CACHE
246 mcr p15, 0, r0, c7, c10, 1 @ clean D line
247#else
248 mcr p15, 0, r0, c7, c11, 1 @ clean unified line
249#endif
250 add r0, r0, #D_CACHE_LINE_SIZE
251 cmp r0, r1
252 blo 1b
253 mov r0, #0
254 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
255 ret lr
256
257/*
258 * v6_dma_flush_range(start,end)
259 * - start - virtual start address of region
260 * - end - virtual end address of region
261 */
262SYM_TYPED_FUNC_START(v6_dma_flush_range)
263 bic r0, r0, #D_CACHE_LINE_SIZE - 1
2641:
265#ifdef HARVARD_CACHE
266 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
267#else
268 mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate line
269#endif
270 add r0, r0, #D_CACHE_LINE_SIZE
271 cmp r0, r1
272 blo 1b
273 mov r0, #0
274 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
275 ret lr
276SYM_FUNC_END(v6_dma_flush_range)
277
278/*
279 * dma_map_area(start, size, dir)
280 * - start - kernel virtual start address
281 * - size - size of region
282 * - dir - DMA direction
283 */
284SYM_TYPED_FUNC_START(v6_dma_map_area)
285 add r1, r1, r0
286 teq r2, #DMA_FROM_DEVICE
287 beq v6_dma_inv_range
288 b v6_dma_clean_range
289SYM_FUNC_END(v6_dma_map_area)
290
291/*
292 * dma_unmap_area(start, size, dir)
293 * - start - kernel virtual start address
294 * - size - size of region
295 * - dir - DMA direction
296 */
297SYM_TYPED_FUNC_START(v6_dma_unmap_area)
298 add r1, r1, r0
299 teq r2, #DMA_TO_DEVICE
300 bne v6_dma_inv_range
301 ret lr
302SYM_FUNC_END(v6_dma_unmap_area)
1/*
2 * linux/arch/arm/mm/cache-v6.S
3 *
4 * Copyright (C) 2001 Deep Blue Solutions Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This is the "shell" of the ARMv6 processor support.
11 */
12#include <linux/linkage.h>
13#include <linux/init.h>
14#include <asm/assembler.h>
15#include <asm/errno.h>
16#include <asm/unwind.h>
17
18#include "proc-macros.S"
19
20#define HARVARD_CACHE
21#define CACHE_LINE_SIZE 32
22#define D_CACHE_LINE_SIZE 32
23#define BTB_FLUSH_SIZE 8
24
25/*
26 * v6_flush_icache_all()
27 *
28 * Flush the whole I-cache.
29 *
30 * ARM1136 erratum 411920 - Invalidate Instruction Cache operation can fail.
31 * This erratum is present in 1136, 1156 and 1176. It does not affect the
32 * MPCore.
33 *
34 * Registers:
35 * r0 - set to 0
36 * r1 - corrupted
37 */
38ENTRY(v6_flush_icache_all)
39 mov r0, #0
40#ifdef CONFIG_ARM_ERRATA_411920
41 mrs r1, cpsr
42 cpsid ifa @ disable interrupts
43 mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
44 mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
45 mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
46 mcr p15, 0, r0, c7, c5, 0 @ invalidate entire I-cache
47 msr cpsr_cx, r1 @ restore interrupts
48 .rept 11 @ ARM Ltd recommends at least
49 nop @ 11 NOPs
50 .endr
51#else
52 mcr p15, 0, r0, c7, c5, 0 @ invalidate I-cache
53#endif
54 ret lr
55ENDPROC(v6_flush_icache_all)
56
57/*
58 * v6_flush_cache_all()
59 *
60 * Flush the entire cache.
61 *
62 * It is assumed that:
63 */
64ENTRY(v6_flush_kern_cache_all)
65 mov r0, #0
66#ifdef HARVARD_CACHE
67 mcr p15, 0, r0, c7, c14, 0 @ D cache clean+invalidate
68#ifndef CONFIG_ARM_ERRATA_411920
69 mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
70#else
71 b v6_flush_icache_all
72#endif
73#else
74 mcr p15, 0, r0, c7, c15, 0 @ Cache clean+invalidate
75#endif
76 ret lr
77
78/*
79 * v6_flush_cache_all()
80 *
81 * Flush all TLB entries in a particular address space
82 *
83 * - mm - mm_struct describing address space
84 */
85ENTRY(v6_flush_user_cache_all)
86 /*FALLTHROUGH*/
87
88/*
89 * v6_flush_cache_range(start, end, flags)
90 *
91 * Flush a range of TLB entries in the specified address space.
92 *
93 * - start - start address (may not be aligned)
94 * - end - end address (exclusive, may not be aligned)
95 * - flags - vm_area_struct flags describing address space
96 *
97 * It is assumed that:
98 * - we have a VIPT cache.
99 */
100ENTRY(v6_flush_user_cache_range)
101 ret lr
102
103/*
104 * v6_coherent_kern_range(start,end)
105 *
106 * Ensure that the I and D caches are coherent within specified
107 * region. This is typically used when code has been written to
108 * a memory region, and will be executed.
109 *
110 * - start - virtual start address of region
111 * - end - virtual end address of region
112 *
113 * It is assumed that:
114 * - the Icache does not read data from the write buffer
115 */
116ENTRY(v6_coherent_kern_range)
117 /* FALLTHROUGH */
118
119/*
120 * v6_coherent_user_range(start,end)
121 *
122 * Ensure that the I and D caches are coherent within specified
123 * region. This is typically used when code has been written to
124 * a memory region, and will be executed.
125 *
126 * - start - virtual start address of region
127 * - end - virtual end address of region
128 *
129 * It is assumed that:
130 * - the Icache does not read data from the write buffer
131 */
132ENTRY(v6_coherent_user_range)
133 UNWIND(.fnstart )
134#ifdef HARVARD_CACHE
135 bic r0, r0, #CACHE_LINE_SIZE - 1
1361:
137 USER( mcr p15, 0, r0, c7, c10, 1 ) @ clean D line
138 add r0, r0, #CACHE_LINE_SIZE
139 cmp r0, r1
140 blo 1b
141#endif
142 mov r0, #0
143#ifdef HARVARD_CACHE
144 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
145#ifndef CONFIG_ARM_ERRATA_411920
146 mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate
147#else
148 b v6_flush_icache_all
149#endif
150#else
151 mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB
152#endif
153 ret lr
154
155/*
156 * Fault handling for the cache operation above. If the virtual address in r0
157 * isn't mapped, fail with -EFAULT.
158 */
1599001:
160 mov r0, #-EFAULT
161 ret lr
162 UNWIND(.fnend )
163ENDPROC(v6_coherent_user_range)
164ENDPROC(v6_coherent_kern_range)
165
166/*
167 * v6_flush_kern_dcache_area(void *addr, size_t size)
168 *
169 * Ensure that the data held in the page kaddr is written back
170 * to the page in question.
171 *
172 * - addr - kernel address
173 * - size - region size
174 */
175ENTRY(v6_flush_kern_dcache_area)
176 add r1, r0, r1
177 bic r0, r0, #D_CACHE_LINE_SIZE - 1
1781:
179#ifdef HARVARD_CACHE
180 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
181#else
182 mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate unified line
183#endif
184 add r0, r0, #D_CACHE_LINE_SIZE
185 cmp r0, r1
186 blo 1b
187#ifdef HARVARD_CACHE
188 mov r0, #0
189 mcr p15, 0, r0, c7, c10, 4
190#endif
191 ret lr
192
193
194/*
195 * v6_dma_inv_range(start,end)
196 *
197 * Invalidate the data cache within the specified region; we will
198 * be performing a DMA operation in this region and we want to
199 * purge old data in the cache.
200 *
201 * - start - virtual start address of region
202 * - end - virtual end address of region
203 */
204v6_dma_inv_range:
205#ifdef CONFIG_DMA_CACHE_RWFO
206 ldrb r2, [r0] @ read for ownership
207 strb r2, [r0] @ write for ownership
208#endif
209 tst r0, #D_CACHE_LINE_SIZE - 1
210 bic r0, r0, #D_CACHE_LINE_SIZE - 1
211#ifdef HARVARD_CACHE
212 mcrne p15, 0, r0, c7, c10, 1 @ clean D line
213#else
214 mcrne p15, 0, r0, c7, c11, 1 @ clean unified line
215#endif
216 tst r1, #D_CACHE_LINE_SIZE - 1
217#ifdef CONFIG_DMA_CACHE_RWFO
218 ldrneb r2, [r1, #-1] @ read for ownership
219 strneb r2, [r1, #-1] @ write for ownership
220#endif
221 bic r1, r1, #D_CACHE_LINE_SIZE - 1
222#ifdef HARVARD_CACHE
223 mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D line
224#else
225 mcrne p15, 0, r1, c7, c15, 1 @ clean & invalidate unified line
226#endif
2271:
228#ifdef HARVARD_CACHE
229 mcr p15, 0, r0, c7, c6, 1 @ invalidate D line
230#else
231 mcr p15, 0, r0, c7, c7, 1 @ invalidate unified line
232#endif
233 add r0, r0, #D_CACHE_LINE_SIZE
234 cmp r0, r1
235#ifdef CONFIG_DMA_CACHE_RWFO
236 ldrlo r2, [r0] @ read for ownership
237 strlo r2, [r0] @ write for ownership
238#endif
239 blo 1b
240 mov r0, #0
241 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
242 ret lr
243
244/*
245 * v6_dma_clean_range(start,end)
246 * - start - virtual start address of region
247 * - end - virtual end address of region
248 */
249v6_dma_clean_range:
250 bic r0, r0, #D_CACHE_LINE_SIZE - 1
2511:
252#ifdef CONFIG_DMA_CACHE_RWFO
253 ldr r2, [r0] @ read for ownership
254#endif
255#ifdef HARVARD_CACHE
256 mcr p15, 0, r0, c7, c10, 1 @ clean D line
257#else
258 mcr p15, 0, r0, c7, c11, 1 @ clean unified line
259#endif
260 add r0, r0, #D_CACHE_LINE_SIZE
261 cmp r0, r1
262 blo 1b
263 mov r0, #0
264 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
265 ret lr
266
267/*
268 * v6_dma_flush_range(start,end)
269 * - start - virtual start address of region
270 * - end - virtual end address of region
271 */
272ENTRY(v6_dma_flush_range)
273#ifdef CONFIG_DMA_CACHE_RWFO
274 ldrb r2, [r0] @ read for ownership
275 strb r2, [r0] @ write for ownership
276#endif
277 bic r0, r0, #D_CACHE_LINE_SIZE - 1
2781:
279#ifdef HARVARD_CACHE
280 mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line
281#else
282 mcr p15, 0, r0, c7, c15, 1 @ clean & invalidate line
283#endif
284 add r0, r0, #D_CACHE_LINE_SIZE
285 cmp r0, r1
286#ifdef CONFIG_DMA_CACHE_RWFO
287 ldrlob r2, [r0] @ read for ownership
288 strlob r2, [r0] @ write for ownership
289#endif
290 blo 1b
291 mov r0, #0
292 mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
293 ret lr
294
295/*
296 * dma_map_area(start, size, dir)
297 * - start - kernel virtual start address
298 * - size - size of region
299 * - dir - DMA direction
300 */
301ENTRY(v6_dma_map_area)
302 add r1, r1, r0
303 teq r2, #DMA_FROM_DEVICE
304 beq v6_dma_inv_range
305#ifndef CONFIG_DMA_CACHE_RWFO
306 b v6_dma_clean_range
307#else
308 teq r2, #DMA_TO_DEVICE
309 beq v6_dma_clean_range
310 b v6_dma_flush_range
311#endif
312ENDPROC(v6_dma_map_area)
313
314/*
315 * dma_unmap_area(start, size, dir)
316 * - start - kernel virtual start address
317 * - size - size of region
318 * - dir - DMA direction
319 */
320ENTRY(v6_dma_unmap_area)
321#ifndef CONFIG_DMA_CACHE_RWFO
322 add r1, r1, r0
323 teq r2, #DMA_TO_DEVICE
324 bne v6_dma_inv_range
325#endif
326 ret lr
327ENDPROC(v6_dma_unmap_area)
328
329 .globl v6_flush_kern_cache_louis
330 .equ v6_flush_kern_cache_louis, v6_flush_kern_cache_all
331
332 __INITDATA
333
334 @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
335 define_cache_functions v6