| 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 - 2007 Tensilica Inc. |
| 11 | * |
| 12 | * Chris Zankel <chris@zankel.net> |
| 13 | */ |
| 14 | |
| 15 | |
| 16 | #include <linux/linkage.h> |
| 17 | #include <linux/pgtable.h> |
| 18 | #include <asm/page.h> |
| 19 | #include <asm/asmmacro.h> |
| 20 | #include <asm/cacheasm.h> |
| 21 | #include <asm/tlbflush.h> |
| 22 | |
| 23 | |
| 24 | /* |
| 25 | * clear_page and clear_user_page are the same for non-cache-aliased configs. |
| 26 | * |
| 27 | * clear_page (unsigned long page) |
| 28 | * a2 |
| 29 | */ |
| 30 | |
| 31 | ENTRY(clear_page) |
| 32 | |
| 33 | abi_entry_default |
| 34 | |
| 35 | movi a3, 0 |
| 36 | __loopi a2, a7, PAGE_SIZE, 32 |
| 37 | s32i a3, a2, 0 |
| 38 | s32i a3, a2, 4 |
| 39 | s32i a3, a2, 8 |
| 40 | s32i a3, a2, 12 |
| 41 | s32i a3, a2, 16 |
| 42 | s32i a3, a2, 20 |
| 43 | s32i a3, a2, 24 |
| 44 | s32i a3, a2, 28 |
| 45 | __endla a2, a7, 32 |
| 46 | |
| 47 | abi_ret_default |
| 48 | |
| 49 | ENDPROC(clear_page) |
| 50 | EXPORT_SYMBOL(clear_page) |
| 51 | |
| 52 | /* |
| 53 | * copy_page and copy_user_page are the same for non-cache-aliased configs. |
| 54 | * |
| 55 | * copy_page (void *to, void *from) |
| 56 | * a2 a3 |
| 57 | */ |
| 58 | |
| 59 | ENTRY(copy_page) |
| 60 | |
| 61 | abi_entry_default |
| 62 | |
| 63 | __loopi a2, a4, PAGE_SIZE, 32 |
| 64 | |
| 65 | l32i a8, a3, 0 |
| 66 | l32i a9, a3, 4 |
| 67 | s32i a8, a2, 0 |
| 68 | s32i a9, a2, 4 |
| 69 | |
| 70 | l32i a8, a3, 8 |
| 71 | l32i a9, a3, 12 |
| 72 | s32i a8, a2, 8 |
| 73 | s32i a9, a2, 12 |
| 74 | |
| 75 | l32i a8, a3, 16 |
| 76 | l32i a9, a3, 20 |
| 77 | s32i a8, a2, 16 |
| 78 | s32i a9, a2, 20 |
| 79 | |
| 80 | l32i a8, a3, 24 |
| 81 | l32i a9, a3, 28 |
| 82 | s32i a8, a2, 24 |
| 83 | s32i a9, a2, 28 |
| 84 | |
| 85 | addi a2, a2, 32 |
| 86 | addi a3, a3, 32 |
| 87 | |
| 88 | __endl a2, a4 |
| 89 | |
| 90 | abi_ret_default |
| 91 | |
| 92 | ENDPROC(copy_page) |
| 93 | EXPORT_SYMBOL(copy_page) |
| 94 | |
| 95 | #ifdef CONFIG_MMU |
| 96 | /* |
| 97 | * If we have to deal with cache aliasing, we use temporary memory mappings |
| 98 | * to ensure that the source and destination pages have the same color as |
| 99 | * the virtual address. We use way 0 and 1 for temporary mappings in such cases. |
| 100 | * |
| 101 | * The temporary DTLB entries shouldn't be flushed by interrupts, but are |
| 102 | * flushed by preemptive task switches. Special code in the |
| 103 | * fast_second_level_miss handler re-established the temporary mapping. |
| 104 | * It requires that the PPNs for the destination and source addresses are |
| 105 | * in a6, and a7, respectively. |
| 106 | */ |
| 107 | |
| 108 | /* TLB miss exceptions are treated special in the following region */ |
| 109 | |
| 110 | ENTRY(__tlbtemp_mapping_start) |
| 111 | |
| 112 | #if (DCACHE_WAY_SIZE > PAGE_SIZE) |
| 113 | |
| 114 | /* |
| 115 | * clear_page_alias(void *addr, unsigned long paddr) |
| 116 | * a2 a3 |
| 117 | */ |
| 118 | |
| 119 | ENTRY(clear_page_alias) |
| 120 | |
| 121 | abi_entry_default |
| 122 | |
| 123 | movi a5, PAGE_OFFSET |
| 124 | addi a6, a3, (PAGE_KERNEL | _PAGE_HW_WRITE) |
| 125 | mov a4, a2 |
| 126 | wdtlb a6, a2 |
| 127 | dsync |
| 128 | |
| 129 | movi a3, 0 |
| 130 | __loopi a2, a7, PAGE_SIZE, 32 |
| 131 | s32i a3, a2, 0 |
| 132 | s32i a3, a2, 4 |
| 133 | s32i a3, a2, 8 |
| 134 | s32i a3, a2, 12 |
| 135 | s32i a3, a2, 16 |
| 136 | s32i a3, a2, 20 |
| 137 | s32i a3, a2, 24 |
| 138 | s32i a3, a2, 28 |
| 139 | __endla a2, a7, 32 |
| 140 | |
| 141 | /* We need to invalidate the temporary dtlb entry. */ |
| 142 | |
| 143 | idtlb a4 |
| 144 | dsync |
| 145 | |
| 146 | abi_ret_default |
| 147 | |
| 148 | ENDPROC(clear_page_alias) |
| 149 | |
| 150 | /* |
| 151 | * copy_page_alias(void *to, void *from, |
| 152 | * a2 a3 |
| 153 | * unsigned long to_paddr, unsigned long from_paddr) |
| 154 | * a4 a5 |
| 155 | */ |
| 156 | |
| 157 | ENTRY(copy_page_alias) |
| 158 | |
| 159 | abi_entry_default |
| 160 | |
| 161 | /* Setup a temporary DTLB for destination. */ |
| 162 | |
| 163 | addi a6, a4, (PAGE_KERNEL | _PAGE_HW_WRITE) |
| 164 | wdtlb a6, a2 |
| 165 | dsync |
| 166 | |
| 167 | /* Setup a temporary DTLB for source. */ |
| 168 | |
| 169 | addi a7, a5, PAGE_KERNEL |
| 170 | addi a8, a3, 1 # way1 |
| 171 | |
| 172 | wdtlb a7, a8 |
| 173 | dsync |
| 174 | |
| 175 | 1: __loopi a2, a4, PAGE_SIZE, 32 |
| 176 | |
| 177 | l32i a8, a3, 0 |
| 178 | l32i a9, a3, 4 |
| 179 | s32i a8, a2, 0 |
| 180 | s32i a9, a2, 4 |
| 181 | |
| 182 | l32i a8, a3, 8 |
| 183 | l32i a9, a3, 12 |
| 184 | s32i a8, a2, 8 |
| 185 | s32i a9, a2, 12 |
| 186 | |
| 187 | l32i a8, a3, 16 |
| 188 | l32i a9, a3, 20 |
| 189 | s32i a8, a2, 16 |
| 190 | s32i a9, a2, 20 |
| 191 | |
| 192 | l32i a8, a3, 24 |
| 193 | l32i a9, a3, 28 |
| 194 | s32i a8, a2, 24 |
| 195 | s32i a9, a2, 28 |
| 196 | |
| 197 | addi a2, a2, 32 |
| 198 | addi a3, a3, 32 |
| 199 | |
| 200 | __endl a2, a4 |
| 201 | |
| 202 | /* We need to invalidate any temporary mapping! */ |
| 203 | |
| 204 | addi a2, a2, -PAGE_SIZE |
| 205 | idtlb a2 |
| 206 | dsync |
| 207 | |
| 208 | addi a3, a3, -PAGE_SIZE+1 |
| 209 | idtlb a3 |
| 210 | dsync |
| 211 | |
| 212 | abi_ret_default |
| 213 | |
| 214 | ENDPROC(copy_page_alias) |
| 215 | |
| 216 | #endif |
| 217 | |
| 218 | #if (DCACHE_WAY_SIZE > PAGE_SIZE) |
| 219 | |
| 220 | /* |
| 221 | * void __flush_invalidate_dcache_page_alias (addr, phys) |
| 222 | * a2 a3 |
| 223 | */ |
| 224 | |
| 225 | ENTRY(__flush_invalidate_dcache_page_alias) |
| 226 | |
| 227 | abi_entry_default |
| 228 | |
| 229 | movi a7, 0 # required for exception handler |
| 230 | addi a6, a3, (PAGE_KERNEL | _PAGE_HW_WRITE) |
| 231 | mov a4, a2 |
| 232 | wdtlb a6, a2 |
| 233 | dsync |
| 234 | |
| 235 | ___flush_invalidate_dcache_page a2 a3 |
| 236 | |
| 237 | idtlb a4 |
| 238 | dsync |
| 239 | |
| 240 | abi_ret_default |
| 241 | |
| 242 | ENDPROC(__flush_invalidate_dcache_page_alias) |
| 243 | |
| 244 | /* |
| 245 | * void __invalidate_dcache_page_alias (addr, phys) |
| 246 | * a2 a3 |
| 247 | */ |
| 248 | |
| 249 | ENTRY(__invalidate_dcache_page_alias) |
| 250 | |
| 251 | abi_entry_default |
| 252 | |
| 253 | movi a7, 0 # required for exception handler |
| 254 | addi a6, a3, (PAGE_KERNEL | _PAGE_HW_WRITE) |
| 255 | mov a4, a2 |
| 256 | wdtlb a6, a2 |
| 257 | dsync |
| 258 | |
| 259 | ___invalidate_dcache_page a2 a3 |
| 260 | |
| 261 | idtlb a4 |
| 262 | dsync |
| 263 | |
| 264 | abi_ret_default |
| 265 | |
| 266 | ENDPROC(__invalidate_dcache_page_alias) |
| 267 | #endif |
| 268 | |
| 269 | ENTRY(__tlbtemp_mapping_itlb) |
| 270 | |
| 271 | #if (ICACHE_WAY_SIZE > PAGE_SIZE) |
| 272 | |
| 273 | ENTRY(__invalidate_icache_page_alias) |
| 274 | |
| 275 | abi_entry_default |
| 276 | |
| 277 | addi a6, a3, (PAGE_KERNEL_EXEC | _PAGE_HW_WRITE) |
| 278 | mov a4, a2 |
| 279 | witlb a6, a2 |
| 280 | isync |
| 281 | |
| 282 | ___invalidate_icache_page a2 a3 |
| 283 | |
| 284 | iitlb a4 |
| 285 | isync |
| 286 | abi_ret_default |
| 287 | |
| 288 | ENDPROC(__invalidate_icache_page_alias) |
| 289 | |
| 290 | #endif |
| 291 | |
| 292 | /* End of special treatment in tlb miss exception */ |
| 293 | |
| 294 | ENTRY(__tlbtemp_mapping_end) |
| 295 | |
| 296 | #endif /* CONFIG_MMU |
| 297 | |
| 298 | /* |
| 299 | * void __invalidate_icache_page(ulong start) |
| 300 | */ |
| 301 | |
| 302 | ENTRY(__invalidate_icache_page) |
| 303 | |
| 304 | abi_entry_default |
| 305 | |
| 306 | ___invalidate_icache_page a2 a3 |
| 307 | isync |
| 308 | |
| 309 | abi_ret_default |
| 310 | |
| 311 | ENDPROC(__invalidate_icache_page) |
| 312 | |
| 313 | /* |
| 314 | * void __invalidate_dcache_page(ulong start) |
| 315 | */ |
| 316 | |
| 317 | ENTRY(__invalidate_dcache_page) |
| 318 | |
| 319 | abi_entry_default |
| 320 | |
| 321 | ___invalidate_dcache_page a2 a3 |
| 322 | dsync |
| 323 | |
| 324 | abi_ret_default |
| 325 | |
| 326 | ENDPROC(__invalidate_dcache_page) |
| 327 | |
| 328 | /* |
| 329 | * void __flush_invalidate_dcache_page(ulong start) |
| 330 | */ |
| 331 | |
| 332 | ENTRY(__flush_invalidate_dcache_page) |
| 333 | |
| 334 | abi_entry_default |
| 335 | |
| 336 | ___flush_invalidate_dcache_page a2 a3 |
| 337 | |
| 338 | dsync |
| 339 | abi_ret_default |
| 340 | |
| 341 | ENDPROC(__flush_invalidate_dcache_page) |
| 342 | |
| 343 | /* |
| 344 | * void __flush_dcache_page(ulong start) |
| 345 | */ |
| 346 | |
| 347 | ENTRY(__flush_dcache_page) |
| 348 | |
| 349 | abi_entry_default |
| 350 | |
| 351 | ___flush_dcache_page a2 a3 |
| 352 | |
| 353 | dsync |
| 354 | abi_ret_default |
| 355 | |
| 356 | ENDPROC(__flush_dcache_page) |
| 357 | |
| 358 | /* |
| 359 | * void __invalidate_icache_range(ulong start, ulong size) |
| 360 | */ |
| 361 | |
| 362 | ENTRY(__invalidate_icache_range) |
| 363 | |
| 364 | abi_entry_default |
| 365 | |
| 366 | ___invalidate_icache_range a2 a3 a4 |
| 367 | isync |
| 368 | |
| 369 | abi_ret_default |
| 370 | |
| 371 | ENDPROC(__invalidate_icache_range) |
| 372 | EXPORT_SYMBOL(__invalidate_icache_range) |
| 373 | |
| 374 | /* |
| 375 | * void __flush_invalidate_dcache_range(ulong start, ulong size) |
| 376 | */ |
| 377 | |
| 378 | ENTRY(__flush_invalidate_dcache_range) |
| 379 | |
| 380 | abi_entry_default |
| 381 | |
| 382 | ___flush_invalidate_dcache_range a2 a3 a4 |
| 383 | dsync |
| 384 | |
| 385 | abi_ret_default |
| 386 | |
| 387 | ENDPROC(__flush_invalidate_dcache_range) |
| 388 | |
| 389 | /* |
| 390 | * void _flush_dcache_range(ulong start, ulong size) |
| 391 | */ |
| 392 | |
| 393 | ENTRY(__flush_dcache_range) |
| 394 | |
| 395 | abi_entry_default |
| 396 | |
| 397 | ___flush_dcache_range a2 a3 a4 |
| 398 | dsync |
| 399 | |
| 400 | abi_ret_default |
| 401 | |
| 402 | ENDPROC(__flush_dcache_range) |
| 403 | EXPORT_SYMBOL(__flush_dcache_range) |
| 404 | |
| 405 | /* |
| 406 | * void _invalidate_dcache_range(ulong start, ulong size) |
| 407 | */ |
| 408 | |
| 409 | ENTRY(__invalidate_dcache_range) |
| 410 | |
| 411 | abi_entry_default |
| 412 | |
| 413 | ___invalidate_dcache_range a2 a3 a4 |
| 414 | |
| 415 | abi_ret_default |
| 416 | |
| 417 | ENDPROC(__invalidate_dcache_range) |
| 418 | EXPORT_SYMBOL(__invalidate_dcache_range) |
| 419 | |
| 420 | /* |
| 421 | * void _invalidate_icache_all(void) |
| 422 | */ |
| 423 | |
| 424 | ENTRY(__invalidate_icache_all) |
| 425 | |
| 426 | abi_entry_default |
| 427 | |
| 428 | ___invalidate_icache_all a2 a3 |
| 429 | isync |
| 430 | |
| 431 | abi_ret_default |
| 432 | |
| 433 | ENDPROC(__invalidate_icache_all) |
| 434 | |
| 435 | /* |
| 436 | * void _flush_invalidate_dcache_all(void) |
| 437 | */ |
| 438 | |
| 439 | ENTRY(__flush_invalidate_dcache_all) |
| 440 | |
| 441 | abi_entry_default |
| 442 | |
| 443 | ___flush_invalidate_dcache_all a2 a3 |
| 444 | dsync |
| 445 | |
| 446 | abi_ret_default |
| 447 | |
| 448 | ENDPROC(__flush_invalidate_dcache_all) |
| 449 | |
| 450 | /* |
| 451 | * void _invalidate_dcache_all(void) |
| 452 | */ |
| 453 | |
| 454 | ENTRY(__invalidate_dcache_all) |
| 455 | |
| 456 | abi_entry_default |
| 457 | |
| 458 | ___invalidate_dcache_all a2 a3 |
| 459 | dsync |
| 460 | |
| 461 | abi_ret_default |
| 462 | |
| 463 | ENDPROC(__invalidate_dcache_all) |
| 464 | |