Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mm/cache-v7.S |
| 3 | * |
| 4 | * Copyright (C) 2001 Deep Blue Solutions Ltd. |
| 5 | * Copyright (C) 2005 ARM Ltd. |
| 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> |
| 15 | #include <asm/assembler.h> |
| 16 | |
| 17 | #include "proc-macros.S" |
| 18 | |
| 19 | /* |
| 20 | * v7_flush_dcache_all() |
| 21 | * |
| 22 | * Flush the whole D-cache. |
| 23 | * |
| 24 | * Corrupted registers: r0-r5, r7, r9-r11 |
| 25 | * |
| 26 | * - mm - mm_struct describing address space |
| 27 | */ |
| 28 | ENTRY(v7_flush_dcache_all) |
Catalin Marinas | c30c2f9 | 2008-11-06 13:23:07 +0000 | [diff] [blame] | 29 | dmb @ ensure ordering with previous memory accesses |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 30 | mrc p15, 1, r0, c0, c0, 1 @ read clidr |
| 31 | ands r3, r0, #0x7000000 @ extract loc from clidr |
| 32 | mov r3, r3, lsr #23 @ left align loc bit field |
| 33 | beq finished @ if loc is 0, then no need to clean |
| 34 | mov r10, #0 @ start clean at cache level 0 |
| 35 | loop1: |
| 36 | add r2, r10, r10, lsr #1 @ work out 3x current cache level |
| 37 | mov r1, r0, lsr r2 @ extract cache type bits from clidr |
| 38 | and r1, r1, #7 @ mask of the bits for current cache only |
| 39 | cmp r1, #2 @ see what cache we have at this level |
| 40 | blt skip @ skip if no cache, or just i-cache |
| 41 | mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr |
| 42 | isb @ isb to sych the new cssr&csidr |
| 43 | mrc p15, 1, r1, c0, c0, 0 @ read the new csidr |
| 44 | and r2, r1, #7 @ extract the length of the cache lines |
| 45 | add r2, r2, #4 @ add 4 (line length offset) |
| 46 | ldr r4, =0x3ff |
| 47 | ands r4, r4, r1, lsr #3 @ find maximum number on the way size |
| 48 | clz r5, r4 @ find bit position of way size increment |
| 49 | ldr r7, =0x7fff |
| 50 | ands r7, r7, r1, lsr #13 @ extract max number of the index size |
| 51 | loop2: |
| 52 | mov r9, r4 @ create working copy of max way size |
| 53 | loop3: |
| 54 | orr r11, r10, r9, lsl r5 @ factor way and cache number into r11 |
| 55 | orr r11, r11, r7, lsl r2 @ factor index number into r11 |
| 56 | mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way |
| 57 | subs r9, r9, #1 @ decrement the way |
| 58 | bge loop3 |
| 59 | subs r7, r7, #1 @ decrement the index |
| 60 | bge loop2 |
| 61 | skip: |
| 62 | add r10, r10, #2 @ increment cache number |
| 63 | cmp r3, r10 |
| 64 | bgt loop1 |
| 65 | finished: |
| 66 | mov r10, #0 @ swith back to cache level 0 |
| 67 | mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr |
Catalin Marinas | c30c2f9 | 2008-11-06 13:23:07 +0000 | [diff] [blame] | 68 | dsb |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 69 | isb |
| 70 | mov pc, lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 71 | ENDPROC(v7_flush_dcache_all) |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 72 | |
| 73 | /* |
| 74 | * v7_flush_cache_all() |
| 75 | * |
| 76 | * Flush the entire cache system. |
| 77 | * The data cache flush is now achieved using atomic clean / invalidates |
| 78 | * working outwards from L1 cache. This is done using Set/Way based cache |
| 79 | * maintainance instructions. |
| 80 | * The instruction cache can still be invalidated back to the point of |
| 81 | * unification in a single instruction. |
| 82 | * |
| 83 | */ |
| 84 | ENTRY(v7_flush_kern_cache_all) |
| 85 | stmfd sp!, {r4-r5, r7, r9-r11, lr} |
| 86 | bl v7_flush_dcache_all |
| 87 | mov r0, #0 |
| 88 | mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate |
| 89 | ldmfd sp!, {r4-r5, r7, r9-r11, lr} |
| 90 | mov pc, lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 91 | ENDPROC(v7_flush_kern_cache_all) |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 92 | |
| 93 | /* |
| 94 | * v7_flush_cache_all() |
| 95 | * |
| 96 | * Flush all TLB entries in a particular address space |
| 97 | * |
| 98 | * - mm - mm_struct describing address space |
| 99 | */ |
| 100 | ENTRY(v7_flush_user_cache_all) |
| 101 | /*FALLTHROUGH*/ |
| 102 | |
| 103 | /* |
| 104 | * v7_flush_cache_range(start, end, flags) |
| 105 | * |
| 106 | * Flush a range of TLB entries in the specified address space. |
| 107 | * |
| 108 | * - start - start address (may not be aligned) |
| 109 | * - end - end address (exclusive, may not be aligned) |
| 110 | * - flags - vm_area_struct flags describing address space |
| 111 | * |
| 112 | * It is assumed that: |
| 113 | * - we have a VIPT cache. |
| 114 | */ |
| 115 | ENTRY(v7_flush_user_cache_range) |
| 116 | mov pc, lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 117 | ENDPROC(v7_flush_user_cache_all) |
| 118 | ENDPROC(v7_flush_user_cache_range) |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 119 | |
| 120 | /* |
| 121 | * v7_coherent_kern_range(start,end) |
| 122 | * |
| 123 | * Ensure that the I and D caches are coherent within specified |
| 124 | * region. This is typically used when code has been written to |
| 125 | * a memory region, and will be executed. |
| 126 | * |
| 127 | * - start - virtual start address of region |
| 128 | * - end - virtual end address of region |
| 129 | * |
| 130 | * It is assumed that: |
| 131 | * - the Icache does not read data from the write buffer |
| 132 | */ |
| 133 | ENTRY(v7_coherent_kern_range) |
| 134 | /* FALLTHROUGH */ |
| 135 | |
| 136 | /* |
| 137 | * v7_coherent_user_range(start,end) |
| 138 | * |
| 139 | * Ensure that the I and D caches are coherent within specified |
| 140 | * region. This is typically used when code has been written to |
| 141 | * a memory region, and will be executed. |
| 142 | * |
| 143 | * - start - virtual start address of region |
| 144 | * - end - virtual end address of region |
| 145 | * |
| 146 | * It is assumed that: |
| 147 | * - the Icache does not read data from the write buffer |
| 148 | */ |
| 149 | ENTRY(v7_coherent_user_range) |
| 150 | dcache_line_size r2, r3 |
| 151 | sub r3, r2, #1 |
| 152 | bic r0, r0, r3 |
| 153 | 1: mcr p15, 0, r0, c7, c11, 1 @ clean D line to the point of unification |
| 154 | dsb |
| 155 | mcr p15, 0, r0, c7, c5, 1 @ invalidate I line |
| 156 | add r0, r0, r2 |
| 157 | cmp r0, r1 |
| 158 | blo 1b |
| 159 | mov r0, #0 |
| 160 | mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB |
| 161 | dsb |
| 162 | isb |
| 163 | mov pc, lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 164 | ENDPROC(v7_coherent_kern_range) |
| 165 | ENDPROC(v7_coherent_user_range) |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 166 | |
| 167 | /* |
| 168 | * v7_flush_kern_dcache_page(kaddr) |
| 169 | * |
| 170 | * Ensure that the data held in the page kaddr is written back |
| 171 | * to the page in question. |
| 172 | * |
| 173 | * - kaddr - kernel address (guaranteed to be page aligned) |
| 174 | */ |
| 175 | ENTRY(v7_flush_kern_dcache_page) |
| 176 | dcache_line_size r2, r3 |
| 177 | add r1, r0, #PAGE_SZ |
| 178 | 1: |
| 179 | mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line / unified line |
| 180 | add r0, r0, r2 |
| 181 | cmp r0, r1 |
| 182 | blo 1b |
| 183 | dsb |
| 184 | mov pc, lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 185 | ENDPROC(v7_flush_kern_dcache_page) |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 186 | |
| 187 | /* |
| 188 | * v7_dma_inv_range(start,end) |
| 189 | * |
| 190 | * Invalidate the data cache within the specified region; we will |
| 191 | * be performing a DMA operation in this region and we want to |
| 192 | * purge old data in the cache. |
| 193 | * |
| 194 | * - start - virtual start address of region |
| 195 | * - end - virtual end address of region |
| 196 | */ |
| 197 | ENTRY(v7_dma_inv_range) |
| 198 | dcache_line_size r2, r3 |
| 199 | sub r3, r2, #1 |
| 200 | tst r0, r3 |
| 201 | bic r0, r0, r3 |
| 202 | mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line |
| 203 | |
| 204 | tst r1, r3 |
| 205 | bic r1, r1, r3 |
| 206 | mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D / U line |
| 207 | 1: |
| 208 | mcr p15, 0, r0, c7, c6, 1 @ invalidate D / U line |
| 209 | add r0, r0, r2 |
| 210 | cmp r0, r1 |
| 211 | blo 1b |
| 212 | dsb |
| 213 | mov pc, lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 214 | ENDPROC(v7_dma_inv_range) |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 215 | |
| 216 | /* |
| 217 | * v7_dma_clean_range(start,end) |
| 218 | * - start - virtual start address of region |
| 219 | * - end - virtual end address of region |
| 220 | */ |
| 221 | ENTRY(v7_dma_clean_range) |
| 222 | dcache_line_size r2, r3 |
| 223 | sub r3, r2, #1 |
| 224 | bic r0, r0, r3 |
| 225 | 1: |
| 226 | mcr p15, 0, r0, c7, c10, 1 @ clean D / U line |
| 227 | add r0, r0, r2 |
| 228 | cmp r0, r1 |
| 229 | blo 1b |
| 230 | dsb |
| 231 | mov pc, lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 232 | ENDPROC(v7_dma_clean_range) |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 233 | |
| 234 | /* |
| 235 | * v7_dma_flush_range(start,end) |
| 236 | * - start - virtual start address of region |
| 237 | * - end - virtual end address of region |
| 238 | */ |
| 239 | ENTRY(v7_dma_flush_range) |
| 240 | dcache_line_size r2, r3 |
| 241 | sub r3, r2, #1 |
| 242 | bic r0, r0, r3 |
| 243 | 1: |
| 244 | mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line |
| 245 | add r0, r0, r2 |
| 246 | cmp r0, r1 |
| 247 | blo 1b |
| 248 | dsb |
| 249 | mov pc, lr |
Catalin Marinas | 93ed397 | 2008-08-28 11:22:32 +0100 | [diff] [blame] | 250 | ENDPROC(v7_dma_flush_range) |
Catalin Marinas | bbe8888 | 2007-05-08 22:27:46 +0100 | [diff] [blame] | 251 | |
| 252 | __INITDATA |
| 253 | |
| 254 | .type v7_cache_fns, #object |
| 255 | ENTRY(v7_cache_fns) |
| 256 | .long v7_flush_kern_cache_all |
| 257 | .long v7_flush_user_cache_all |
| 258 | .long v7_flush_user_cache_range |
| 259 | .long v7_coherent_kern_range |
| 260 | .long v7_coherent_user_range |
| 261 | .long v7_flush_kern_dcache_page |
| 262 | .long v7_dma_inv_range |
| 263 | .long v7_dma_clean_range |
| 264 | .long v7_dma_flush_range |
| 265 | .size v7_cache_fns, . - v7_cache_fns |