1 /* 2 * arch/arm/include/asm/tlbflush.h 3 * 4 * Copyright (C) 1999-2003 Russell King 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 #ifndef _ASMARM_TLBFLUSH_H 11 #define _ASMARM_TLBFLUSH_H 12 13 14 #ifndef CONFIG_MMU 15 16 #define tlb_flush(tlb) ((void) tlb) 17 18 #else /* CONFIG_MMU */ 19 20 #include <asm/glue.h> 21 22 #define TLB_V3_PAGE (1 << 0) 23 #define TLB_V4_U_PAGE (1 << 1) 24 #define TLB_V4_D_PAGE (1 << 2) 25 #define TLB_V4_I_PAGE (1 << 3) 26 #define TLB_V6_U_PAGE (1 << 4) 27 #define TLB_V6_D_PAGE (1 << 5) 28 #define TLB_V6_I_PAGE (1 << 6) 29 30 #define TLB_V3_FULL (1 << 8) 31 #define TLB_V4_U_FULL (1 << 9) 32 #define TLB_V4_D_FULL (1 << 10) 33 #define TLB_V4_I_FULL (1 << 11) 34 #define TLB_V6_U_FULL (1 << 12) 35 #define TLB_V6_D_FULL (1 << 13) 36 #define TLB_V6_I_FULL (1 << 14) 37 38 #define TLB_V6_U_ASID (1 << 16) 39 #define TLB_V6_D_ASID (1 << 17) 40 #define TLB_V6_I_ASID (1 << 18) 41 42 #define TLB_BTB (1 << 28) 43 44 /* Unified Inner Shareable TLB operations (ARMv7 MP extensions) */ 45 #define TLB_V7_UIS_PAGE (1 << 19) 46 #define TLB_V7_UIS_FULL (1 << 20) 47 #define TLB_V7_UIS_ASID (1 << 21) 48 49 /* Inner Shareable BTB operation (ARMv7 MP extensions) */ 50 #define TLB_V7_IS_BTB (1 << 22) 51 52 #define TLB_L2CLEAN_FR (1 << 29) /* Feroceon */ 53 #define TLB_DCLEAN (1 << 30) 54 #define TLB_WB (1 << 31) 55 56 /* 57 * MMU TLB Model 58 * ============= 59 * 60 * We have the following to choose from: 61 * v3 - ARMv3 62 * v4 - ARMv4 without write buffer 63 * v4wb - ARMv4 with write buffer without I TLB flush entry instruction 64 * v4wbi - ARMv4 with write buffer with I TLB flush entry instruction 65 * fr - Feroceon (v4wbi with non-outer-cacheable page table walks) 66 * fa - Faraday (v4 with write buffer with UTLB and branch target buffer (BTB)) 67 * v6wbi - ARMv6 with write buffer with I TLB flush entry instruction 68 * v7wbi - identical to v6wbi 69 */ 70 #undef _TLB 71 #undef MULTI_TLB 72 73 #define v3_tlb_flags (TLB_V3_FULL | TLB_V3_PAGE) 74 75 #ifdef CONFIG_CPU_TLB_V3 76 # define v3_possible_flags v3_tlb_flags 77 # define v3_always_flags v3_tlb_flags 78 # ifdef _TLB 79 # define MULTI_TLB 1 80 # else 81 # define _TLB v3 82 # endif 83 #else 84 # define v3_possible_flags 0 85 # define v3_always_flags (-1UL) 86 #endif 87 88 #define v4_tlb_flags (TLB_V4_U_FULL | TLB_V4_U_PAGE) 89 90 #ifdef CONFIG_CPU_TLB_V4WT 91 # define v4_possible_flags v4_tlb_flags 92 # define v4_always_flags v4_tlb_flags 93 # ifdef _TLB 94 # define MULTI_TLB 1 95 # else 96 # define _TLB v4 97 # endif 98 #else 99 # define v4_possible_flags 0 100 # define v4_always_flags (-1UL) 101 #endif 102 103 #define fa_tlb_flags (TLB_WB | TLB_BTB | TLB_DCLEAN | \ 104 TLB_V4_U_FULL | TLB_V4_U_PAGE) 105 106 #ifdef CONFIG_CPU_TLB_FA 107 # define fa_possible_flags fa_tlb_flags 108 # define fa_always_flags fa_tlb_flags 109 # ifdef _TLB 110 # define MULTI_TLB 1 111 # else 112 # define _TLB fa 113 # endif 114 #else 115 # define fa_possible_flags 0 116 # define fa_always_flags (-1UL) 117 #endif 118 119 #define v4wbi_tlb_flags (TLB_WB | TLB_DCLEAN | \ 120 TLB_V4_I_FULL | TLB_V4_D_FULL | \ 121 TLB_V4_I_PAGE | TLB_V4_D_PAGE) 122 123 #ifdef CONFIG_CPU_TLB_V4WBI 124 # define v4wbi_possible_flags v4wbi_tlb_flags 125 # define v4wbi_always_flags v4wbi_tlb_flags 126 # ifdef _TLB 127 # define MULTI_TLB 1 128 # else 129 # define _TLB v4wbi 130 # endif 131 #else 132 # define v4wbi_possible_flags 0 133 # define v4wbi_always_flags (-1UL) 134 #endif 135 136 #define fr_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_L2CLEAN_FR | \ 137 TLB_V4_I_FULL | TLB_V4_D_FULL | \ 138 TLB_V4_I_PAGE | TLB_V4_D_PAGE) 139 140 #ifdef CONFIG_CPU_TLB_FEROCEON 141 # define fr_possible_flags fr_tlb_flags 142 # define fr_always_flags fr_tlb_flags 143 # ifdef _TLB 144 # define MULTI_TLB 1 145 # else 146 # define _TLB v4wbi 147 # endif 148 #else 149 # define fr_possible_flags 0 150 # define fr_always_flags (-1UL) 151 #endif 152 153 #define v4wb_tlb_flags (TLB_WB | TLB_DCLEAN | \ 154 TLB_V4_I_FULL | TLB_V4_D_FULL | \ 155 TLB_V4_D_PAGE) 156 157 #ifdef CONFIG_CPU_TLB_V4WB 158 # define v4wb_possible_flags v4wb_tlb_flags 159 # define v4wb_always_flags v4wb_tlb_flags 160 # ifdef _TLB 161 # define MULTI_TLB 1 162 # else 163 # define _TLB v4wb 164 # endif 165 #else 166 # define v4wb_possible_flags 0 167 # define v4wb_always_flags (-1UL) 168 #endif 169 170 #define v6wbi_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_BTB | \ 171 TLB_V6_I_FULL | TLB_V6_D_FULL | \ 172 TLB_V6_I_PAGE | TLB_V6_D_PAGE | \ 173 TLB_V6_I_ASID | TLB_V6_D_ASID) 174 175 #ifdef CONFIG_CPU_TLB_V6 176 # define v6wbi_possible_flags v6wbi_tlb_flags 177 # define v6wbi_always_flags v6wbi_tlb_flags 178 # ifdef _TLB 179 # define MULTI_TLB 1 180 # else 181 # define _TLB v6wbi 182 # endif 183 #else 184 # define v6wbi_possible_flags 0 185 # define v6wbi_always_flags (-1UL) 186 #endif 187 188 #ifdef CONFIG_SMP 189 #define v7wbi_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_V7_IS_BTB | \ 190 TLB_V7_UIS_FULL | TLB_V7_UIS_PAGE | TLB_V7_UIS_ASID) 191 #else 192 #define v7wbi_tlb_flags (TLB_WB | TLB_DCLEAN | TLB_BTB | \ 193 TLB_V6_U_FULL | TLB_V6_U_PAGE | TLB_V6_U_ASID) 194 #endif 195 196 #ifdef CONFIG_CPU_TLB_V7 197 # define v7wbi_possible_flags v7wbi_tlb_flags 198 # define v7wbi_always_flags v7wbi_tlb_flags 199 # ifdef _TLB 200 # define MULTI_TLB 1 201 # else 202 # define _TLB v7wbi 203 # endif 204 #else 205 # define v7wbi_possible_flags 0 206 # define v7wbi_always_flags (-1UL) 207 #endif 208 209 #ifndef _TLB 210 #error Unknown TLB model 211 #endif 212 213 #ifndef __ASSEMBLY__ 214 215 #include <linux/sched.h> 216 217 struct cpu_tlb_fns { 218 void (*flush_user_range)(unsigned long, unsigned long, struct vm_area_struct *); 219 void (*flush_kern_range)(unsigned long, unsigned long); 220 unsigned long tlb_flags; 221 }; 222 223 /* 224 * Select the calling method 225 */ 226 #ifdef MULTI_TLB 227 228 #define __cpu_flush_user_tlb_range cpu_tlb.flush_user_range 229 #define __cpu_flush_kern_tlb_range cpu_tlb.flush_kern_range 230 231 #else 232 233 #define __cpu_flush_user_tlb_range __glue(_TLB,_flush_user_tlb_range) 234 #define __cpu_flush_kern_tlb_range __glue(_TLB,_flush_kern_tlb_range) 235 236 extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long, struct vm_area_struct *); 237 extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long); 238 239 #endif 240 241 extern struct cpu_tlb_fns cpu_tlb; 242 243 #define __cpu_tlb_flags cpu_tlb.tlb_flags 244 245 /* 246 * TLB Management 247 * ============== 248 * 249 * The arch/arm/mm/tlb-*.S files implement these methods. 250 * 251 * The TLB specific code is expected to perform whatever tests it 252 * needs to determine if it should invalidate the TLB for each 253 * call. Start addresses are inclusive and end addresses are 254 * exclusive; it is safe to round these addresses down. 255 * 256 * flush_tlb_all() 257 * 258 * Invalidate the entire TLB. 259 * 260 * flush_tlb_mm(mm) 261 * 262 * Invalidate all TLB entries in a particular address 263 * space. 264 * - mm - mm_struct describing address space 265 * 266 * flush_tlb_range(mm,start,end) 267 * 268 * Invalidate a range of TLB entries in the specified 269 * address space. 270 * - mm - mm_struct describing address space 271 * - start - start address (may not be aligned) 272 * - end - end address (exclusive, may not be aligned) 273 * 274 * flush_tlb_page(vaddr,vma) 275 * 276 * Invalidate the specified page in the specified address range. 277 * - vaddr - virtual address (may not be aligned) 278 * - vma - vma_struct describing address range 279 * 280 * flush_kern_tlb_page(kaddr) 281 * 282 * Invalidate the TLB entry for the specified page. The address 283 * will be in the kernels virtual memory space. Current uses 284 * only require the D-TLB to be invalidated. 285 * - kaddr - Kernel virtual memory address 286 */ 287 288 /* 289 * We optimise the code below by: 290 * - building a set of TLB flags that might be set in __cpu_tlb_flags 291 * - building a set of TLB flags that will always be set in __cpu_tlb_flags 292 * - if we're going to need __cpu_tlb_flags, access it once and only once 293 * 294 * This allows us to build optimal assembly for the single-CPU type case, 295 * and as close to optimal given the compiler constrants for multi-CPU 296 * case. We could do better for the multi-CPU case if the compiler 297 * implemented the "%?" method, but this has been discontinued due to too 298 * many people getting it wrong. 299 */ 300 #define possible_tlb_flags (v3_possible_flags | \ 301 v4_possible_flags | \ 302 v4wbi_possible_flags | \ 303 fr_possible_flags | \ 304 v4wb_possible_flags | \ 305 fa_possible_flags | \ 306 v6wbi_possible_flags | \ 307 v7wbi_possible_flags) 308 309 #define always_tlb_flags (v3_always_flags & \ 310 v4_always_flags & \ 311 v4wbi_always_flags & \ 312 fr_always_flags & \ 313 v4wb_always_flags & \ 314 fa_always_flags & \ 315 v6wbi_always_flags & \ 316 v7wbi_always_flags) 317 318 #define tlb_flag(f) ((always_tlb_flags & (f)) || (__tlb_flag & possible_tlb_flags & (f))) 319 320 static inline void local_flush_tlb_all(void) 321 { 322 const int zero = 0; 323 const unsigned int __tlb_flag = __cpu_tlb_flags; 324 325 if (tlb_flag(TLB_WB)) 326 dsb(); 327 328 if (tlb_flag(TLB_V3_FULL)) 329 asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (zero) : "cc"); 330 if (tlb_flag(TLB_V4_U_FULL | TLB_V6_U_FULL)) 331 asm("mcr p15, 0, %0, c8, c7, 0" : : "r" (zero) : "cc"); 332 if (tlb_flag(TLB_V4_D_FULL | TLB_V6_D_FULL)) 333 asm("mcr p15, 0, %0, c8, c6, 0" : : "r" (zero) : "cc"); 334 if (tlb_flag(TLB_V4_I_FULL | TLB_V6_I_FULL)) 335 asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); 336 if (tlb_flag(TLB_V7_UIS_FULL)) 337 asm("mcr p15, 0, %0, c8, c3, 0" : : "r" (zero) : "cc"); 338 339 if (tlb_flag(TLB_BTB)) { 340 /* flush the branch target cache */ 341 asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc"); 342 dsb(); 343 isb(); 344 } 345 if (tlb_flag(TLB_V7_IS_BTB)) { 346 /* flush the branch target cache */ 347 asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc"); 348 dsb(); 349 isb(); 350 } 351 } 352 353 static inline void local_flush_tlb_mm(struct mm_struct *mm) 354 { 355 const int zero = 0; 356 const int asid = ASID(mm); 357 const unsigned int __tlb_flag = __cpu_tlb_flags; 358 359 if (tlb_flag(TLB_WB)) 360 dsb(); 361 362 if (cpumask_test_cpu(get_cpu(), mm_cpumask(mm))) { 363 if (tlb_flag(TLB_V3_FULL)) 364 asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (zero) : "cc"); 365 if (tlb_flag(TLB_V4_U_FULL)) 366 asm("mcr p15, 0, %0, c8, c7, 0" : : "r" (zero) : "cc"); 367 if (tlb_flag(TLB_V4_D_FULL)) 368 asm("mcr p15, 0, %0, c8, c6, 0" : : "r" (zero) : "cc"); 369 if (tlb_flag(TLB_V4_I_FULL)) 370 asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); 371 } 372 put_cpu(); 373 374 if (tlb_flag(TLB_V6_U_ASID)) 375 asm("mcr p15, 0, %0, c8, c7, 2" : : "r" (asid) : "cc"); 376 if (tlb_flag(TLB_V6_D_ASID)) 377 asm("mcr p15, 0, %0, c8, c6, 2" : : "r" (asid) : "cc"); 378 if (tlb_flag(TLB_V6_I_ASID)) 379 asm("mcr p15, 0, %0, c8, c5, 2" : : "r" (asid) : "cc"); 380 if (tlb_flag(TLB_V7_UIS_ASID)) 381 asm("mcr p15, 0, %0, c8, c3, 2" : : "r" (asid) : "cc"); 382 383 if (tlb_flag(TLB_BTB)) { 384 /* flush the branch target cache */ 385 asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc"); 386 dsb(); 387 } 388 if (tlb_flag(TLB_V7_IS_BTB)) { 389 /* flush the branch target cache */ 390 asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc"); 391 dsb(); 392 isb(); 393 } 394 } 395 396 static inline void 397 local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) 398 { 399 const int zero = 0; 400 const unsigned int __tlb_flag = __cpu_tlb_flags; 401 402 uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm); 403 404 if (tlb_flag(TLB_WB)) 405 dsb(); 406 407 if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) { 408 if (tlb_flag(TLB_V3_PAGE)) 409 asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (uaddr) : "cc"); 410 if (tlb_flag(TLB_V4_U_PAGE)) 411 asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (uaddr) : "cc"); 412 if (tlb_flag(TLB_V4_D_PAGE)) 413 asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (uaddr) : "cc"); 414 if (tlb_flag(TLB_V4_I_PAGE)) 415 asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (uaddr) : "cc"); 416 if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL)) 417 asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); 418 } 419 420 if (tlb_flag(TLB_V6_U_PAGE)) 421 asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (uaddr) : "cc"); 422 if (tlb_flag(TLB_V6_D_PAGE)) 423 asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (uaddr) : "cc"); 424 if (tlb_flag(TLB_V6_I_PAGE)) 425 asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (uaddr) : "cc"); 426 if (tlb_flag(TLB_V7_UIS_PAGE)) 427 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (uaddr) : "cc"); 428 429 if (tlb_flag(TLB_BTB)) { 430 /* flush the branch target cache */ 431 asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc"); 432 dsb(); 433 } 434 if (tlb_flag(TLB_V7_IS_BTB)) { 435 /* flush the branch target cache */ 436 asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc"); 437 dsb(); 438 isb(); 439 } 440 } 441 442 static inline void local_flush_tlb_kernel_page(unsigned long kaddr) 443 { 444 const int zero = 0; 445 const unsigned int __tlb_flag = __cpu_tlb_flags; 446 447 kaddr &= PAGE_MASK; 448 449 if (tlb_flag(TLB_WB)) 450 dsb(); 451 452 if (tlb_flag(TLB_V3_PAGE)) 453 asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (kaddr) : "cc"); 454 if (tlb_flag(TLB_V4_U_PAGE)) 455 asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (kaddr) : "cc"); 456 if (tlb_flag(TLB_V4_D_PAGE)) 457 asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (kaddr) : "cc"); 458 if (tlb_flag(TLB_V4_I_PAGE)) 459 asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (kaddr) : "cc"); 460 if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL)) 461 asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc"); 462 463 if (tlb_flag(TLB_V6_U_PAGE)) 464 asm("mcr p15, 0, %0, c8, c7, 1" : : "r" (kaddr) : "cc"); 465 if (tlb_flag(TLB_V6_D_PAGE)) 466 asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (kaddr) : "cc"); 467 if (tlb_flag(TLB_V6_I_PAGE)) 468 asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (kaddr) : "cc"); 469 if (tlb_flag(TLB_V7_UIS_PAGE)) 470 asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (kaddr) : "cc"); 471 472 if (tlb_flag(TLB_BTB)) { 473 /* flush the branch target cache */ 474 asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc"); 475 dsb(); 476 isb(); 477 } 478 if (tlb_flag(TLB_V7_IS_BTB)) { 479 /* flush the branch target cache */ 480 asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc"); 481 dsb(); 482 isb(); 483 } 484 } 485 486 /* 487 * flush_pmd_entry 488 * 489 * Flush a PMD entry (word aligned, or double-word aligned) to 490 * RAM if the TLB for the CPU we are running on requires this. 491 * This is typically used when we are creating PMD entries. 492 * 493 * clean_pmd_entry 494 * 495 * Clean (but don't drain the write buffer) if the CPU requires 496 * these operations. This is typically used when we are removing 497 * PMD entries. 498 */ 499 static inline void flush_pmd_entry(pmd_t *pmd) 500 { 501 const unsigned int __tlb_flag = __cpu_tlb_flags; 502 503 if (tlb_flag(TLB_DCLEAN)) 504 asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pmd" 505 : : "r" (pmd) : "cc"); 506 507 if (tlb_flag(TLB_L2CLEAN_FR)) 508 asm("mcr p15, 1, %0, c15, c9, 1 @ L2 flush_pmd" 509 : : "r" (pmd) : "cc"); 510 511 if (tlb_flag(TLB_WB)) 512 dsb(); 513 } 514 515 static inline void clean_pmd_entry(pmd_t *pmd) 516 { 517 const unsigned int __tlb_flag = __cpu_tlb_flags; 518 519 if (tlb_flag(TLB_DCLEAN)) 520 asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pmd" 521 : : "r" (pmd) : "cc"); 522 523 if (tlb_flag(TLB_L2CLEAN_FR)) 524 asm("mcr p15, 1, %0, c15, c9, 1 @ L2 flush_pmd" 525 : : "r" (pmd) : "cc"); 526 } 527 528 #undef tlb_flag 529 #undef always_tlb_flags 530 #undef possible_tlb_flags 531 532 /* 533 * Convert calls to our calling convention. 534 */ 535 #define local_flush_tlb_range(vma,start,end) __cpu_flush_user_tlb_range(start,end,vma) 536 #define local_flush_tlb_kernel_range(s,e) __cpu_flush_kern_tlb_range(s,e) 537 538 #ifndef CONFIG_SMP 539 #define flush_tlb_all local_flush_tlb_all 540 #define flush_tlb_mm local_flush_tlb_mm 541 #define flush_tlb_page local_flush_tlb_page 542 #define flush_tlb_kernel_page local_flush_tlb_kernel_page 543 #define flush_tlb_range local_flush_tlb_range 544 #define flush_tlb_kernel_range local_flush_tlb_kernel_range 545 #else 546 extern void flush_tlb_all(void); 547 extern void flush_tlb_mm(struct mm_struct *mm); 548 extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr); 549 extern void flush_tlb_kernel_page(unsigned long kaddr); 550 extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); 551 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); 552 #endif 553 554 /* 555 * if PG_dcache_dirty is set for the page, we need to ensure that any 556 * cache entries for the kernels virtual memory range are written 557 * back to the page. 558 */ 559 extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, 560 pte_t *ptep); 561 562 #endif 563 564 #endif /* CONFIG_MMU */ 565 566 #endif 567