1/* 2 * linux/include/asm-arm/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_DCLEAN (1 << 30) 43#define TLB_WB (1 << 31) 44 45/* 46 * MMU TLB Model 47 * ============= 48 * 49 * We have the following to choose from: 50 * v3 - ARMv3 51 * v4 - ARMv4 without write buffer 52 * v4wb - ARMv4 with write buffer without I TLB flush entry instruction 53 * v4wbi - ARMv4 with write buffer with I TLB flush entry instruction 54 * v6wbi - ARMv6 with write buffer with I TLB flush entry instruction 55 */ 56#undef _TLB 57#undef MULTI_TLB 58 59#define v3_tlb_flags (TLB_V3_FULL | TLB_V3_PAGE) 60 61#ifdef CONFIG_CPU_TLB_V3 62# define v3_possible_flags v3_tlb_flags 63# define v3_always_flags v3_tlb_flags 64# ifdef _TLB 65# define MULTI_TLB 1 66# else 67# define _TLB v3 68# endif 69#else 70# define v3_possible_flags 0 71# define v3_always_flags (-1UL) 72#endif 73 74#define v4_tlb_flags (TLB_V4_U_FULL | TLB_V4_U_PAGE) 75 76#ifdef CONFIG_CPU_TLB_V4WT 77# define v4_possible_flags v4_tlb_flags 78# define v4_always_flags v4_tlb_flags 79# ifdef _TLB 80# define MULTI_TLB 1 81# else 82# define _TLB v4 83# endif 84#else 85# define v4_possible_flags 0 86# define v4_always_flags (-1UL) 87#endif 88 89#define v4wbi_tlb_flags (TLB_WB | TLB_DCLEAN | \ 90 TLB_V4_I_FULL | TLB_V4_D_FULL | \ 91 TLB_V4_I_PAGE | TLB_V4_D_PAGE) 92 93#ifdef CONFIG_CPU_TLB_V4WBI 94# define v4wbi_possible_flags v4wbi_tlb_flags 95# define v4wbi_always_flags v4wbi_tlb_flags 96# ifdef _TLB 97# define MULTI_TLB 1 98# else 99# define _TLB v4wbi 100# endif 101#else 102# define v4wbi_possible_flags 0 103# define v4wbi_always_flags (-1UL) 104#endif 105 106#define v4wb_tlb_flags (TLB_WB | TLB_DCLEAN | \ 107 TLB_V4_I_FULL | TLB_V4_D_FULL | \ 108 TLB_V4_D_PAGE) 109 110#ifdef CONFIG_CPU_TLB_V4WB 111# define v4wb_possible_flags v4wb_tlb_flags 112# define v4wb_always_flags v4wb_tlb_flags 113# ifdef _TLB 114# define MULTI_TLB 1 115# else 116# define _TLB v4wb 117# endif 118#else 119# define v4wb_possible_flags 0 120# define v4wb_always_flags (-1UL) 121#endif 122 123#define v6wbi_tlb_flags (TLB_WB | TLB_DCLEAN | \ 124 TLB_V6_I_FULL | TLB_V6_D_FULL | \ 125 TLB_V6_I_PAGE | TLB_V6_D_PAGE | \ 126 TLB_V6_I_ASID | TLB_V6_D_ASID) 127 128#ifdef CONFIG_CPU_TLB_V6 129# define v6wbi_possible_flags v6wbi_tlb_flags 130# define v6wbi_always_flags v6wbi_tlb_flags 131# ifdef _TLB 132# define MULTI_TLB 1 133# else 134# define _TLB v6wbi 135# endif 136#else 137# define v6wbi_possible_flags 0 138# define v6wbi_always_flags (-1UL) 139#endif 140 141#ifndef _TLB 142#error Unknown TLB model 143#endif 144 145#ifndef __ASSEMBLY__ 146 147struct cpu_tlb_fns { 148 void (*flush_user_range)(unsigned long, unsigned long, struct vm_area_struct *); 149 void (*flush_kern_range)(unsigned long, unsigned long); 150 unsigned long tlb_flags; 151}; 152 153/* 154 * Select the calling method 155 */ 156#ifdef MULTI_TLB 157 158#define __cpu_flush_user_tlb_range cpu_tlb.flush_user_range 159#define __cpu_flush_kern_tlb_range cpu_tlb.flush_kern_range 160 161#else 162 163#define __cpu_flush_user_tlb_range __glue(_TLB,_flush_user_tlb_range) 164#define __cpu_flush_kern_tlb_range __glue(_TLB,_flush_kern_tlb_range) 165 166extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long, struct vm_area_struct *); 167extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long); 168 169#endif 170 171extern struct cpu_tlb_fns cpu_tlb; 172 173#define __cpu_tlb_flags cpu_tlb.tlb_flags 174 175/* 176 * TLB Management 177 * ============== 178 * 179 * The arch/arm/mm/tlb-*.S files implement these methods. 180 * 181 * The TLB specific code is expected to perform whatever tests it 182 * needs to determine if it should invalidate the TLB for each 183 * call. Start addresses are inclusive and end addresses are 184 * exclusive; it is safe to round these addresses down. 185 * 186 * flush_tlb_all() 187 * 188 * Invalidate the entire TLB. 189 * 190 * flush_tlb_mm(mm) 191 * 192 * Invalidate all TLB entries in a particular address 193 * space. 194 * - mm - mm_struct describing address space 195 * 196 * flush_tlb_range(mm,start,end) 197 * 198 * Invalidate a range of TLB entries in the specified 199 * address space. 200 * - mm - mm_struct describing address space 201 * - start - start address (may not be aligned) 202 * - end - end address (exclusive, may not be aligned) 203 * 204 * flush_tlb_page(vaddr,vma) 205 * 206 * Invalidate the specified page in the specified address range. 207 * - vaddr - virtual address (may not be aligned) 208 * - vma - vma_struct describing address range 209 * 210 * flush_kern_tlb_page(kaddr) 211 * 212 * Invalidate the TLB entry for the specified page. The address 213 * will be in the kernels virtual memory space. Current uses 214 * only require the D-TLB to be invalidated. 215 * - kaddr - Kernel virtual memory address 216 */ 217 218/* 219 * We optimise the code below by: 220 * - building a set of TLB flags that might be set in __cpu_tlb_flags 221 * - building a set of TLB flags that will always be set in __cpu_tlb_flags 222 * - if we're going to need __cpu_tlb_flags, access it once and only once 223 * 224 * This allows us to build optimal assembly for the single-CPU type case, 225 * and as close to optimal given the compiler constrants for multi-CPU 226 * case. We could do better for the multi-CPU case if the compiler 227 * implemented the "%?" method, but this has been discontinued due to too 228 * many people getting it wrong. 229 */ 230#define possible_tlb_flags (v3_possible_flags | \ 231 v4_possible_flags | \ 232 v4wbi_possible_flags | \ 233 v4wb_possible_flags | \ 234 v6wbi_possible_flags) 235 236#define always_tlb_flags (v3_always_flags & \ 237 v4_always_flags & \ 238 v4wbi_always_flags & \ 239 v4wb_always_flags & \ 240 v6wbi_always_flags) 241 242#define tlb_flag(f) ((always_tlb_flags & (f)) || (__tlb_flag & possible_tlb_flags & (f))) 243 244static inline void local_flush_tlb_all(void) 245{ 246 const int zero = 0; 247 const unsigned int __tlb_flag = __cpu_tlb_flags; 248 249 if (tlb_flag(TLB_WB)) 250 asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); 251 252 if (tlb_flag(TLB_V3_FULL)) 253 asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (zero)); 254 if (tlb_flag(TLB_V4_U_FULL | TLB_V6_U_FULL)) 255 asm("mcr%? p15, 0, %0, c8, c7, 0" : : "r" (zero)); 256 if (tlb_flag(TLB_V4_D_FULL | TLB_V6_D_FULL)) 257 asm("mcr%? p15, 0, %0, c8, c6, 0" : : "r" (zero)); 258 if (tlb_flag(TLB_V4_I_FULL | TLB_V6_I_FULL)) 259 asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero)); 260} 261 262static inline void local_flush_tlb_mm(struct mm_struct *mm) 263{ 264 const int zero = 0; 265 const int asid = ASID(mm); 266 const unsigned int __tlb_flag = __cpu_tlb_flags; 267 268 if (tlb_flag(TLB_WB)) 269 asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); 270 271 if (cpu_isset(smp_processor_id(), mm->cpu_vm_mask)) { 272 if (tlb_flag(TLB_V3_FULL)) 273 asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (zero)); 274 if (tlb_flag(TLB_V4_U_FULL)) 275 asm("mcr%? p15, 0, %0, c8, c7, 0" : : "r" (zero)); 276 if (tlb_flag(TLB_V4_D_FULL)) 277 asm("mcr%? p15, 0, %0, c8, c6, 0" : : "r" (zero)); 278 if (tlb_flag(TLB_V4_I_FULL)) 279 asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero)); 280 } 281 282 if (tlb_flag(TLB_V6_U_ASID)) 283 asm("mcr%? p15, 0, %0, c8, c7, 2" : : "r" (asid)); 284 if (tlb_flag(TLB_V6_D_ASID)) 285 asm("mcr%? p15, 0, %0, c8, c6, 2" : : "r" (asid)); 286 if (tlb_flag(TLB_V6_I_ASID)) 287 asm("mcr%? p15, 0, %0, c8, c5, 2" : : "r" (asid)); 288} 289 290static inline void 291local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) 292{ 293 const int zero = 0; 294 const unsigned int __tlb_flag = __cpu_tlb_flags; 295 296 uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm); 297 298 if (tlb_flag(TLB_WB)) 299 asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); 300 301 if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) { 302 if (tlb_flag(TLB_V3_PAGE)) 303 asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (uaddr)); 304 if (tlb_flag(TLB_V4_U_PAGE)) 305 asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (uaddr)); 306 if (tlb_flag(TLB_V4_D_PAGE)) 307 asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (uaddr)); 308 if (tlb_flag(TLB_V4_I_PAGE)) 309 asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (uaddr)); 310 if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL)) 311 asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero)); 312 } 313 314 if (tlb_flag(TLB_V6_U_PAGE)) 315 asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (uaddr)); 316 if (tlb_flag(TLB_V6_D_PAGE)) 317 asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (uaddr)); 318 if (tlb_flag(TLB_V6_I_PAGE)) 319 asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (uaddr)); 320} 321 322static inline void local_flush_tlb_kernel_page(unsigned long kaddr) 323{ 324 const int zero = 0; 325 const unsigned int __tlb_flag = __cpu_tlb_flags; 326 327 kaddr &= PAGE_MASK; 328 329 if (tlb_flag(TLB_WB)) 330 asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); 331 332 if (tlb_flag(TLB_V3_PAGE)) 333 asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (kaddr)); 334 if (tlb_flag(TLB_V4_U_PAGE)) 335 asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (kaddr)); 336 if (tlb_flag(TLB_V4_D_PAGE)) 337 asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (kaddr)); 338 if (tlb_flag(TLB_V4_I_PAGE)) 339 asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (kaddr)); 340 if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL)) 341 asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero)); 342 343 if (tlb_flag(TLB_V6_U_PAGE)) 344 asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (kaddr)); 345 if (tlb_flag(TLB_V6_D_PAGE)) 346 asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (kaddr)); 347 if (tlb_flag(TLB_V6_I_PAGE)) 348 asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (kaddr)); 349 350 /* The ARM ARM states that the completion of a TLB maintenance 351 * operation is only guaranteed by a DSB instruction 352 */ 353 if (tlb_flag(TLB_V6_U_PAGE | TLB_V6_D_PAGE | TLB_V6_I_PAGE)) 354 asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); 355} 356 357/* 358 * flush_pmd_entry 359 * 360 * Flush a PMD entry (word aligned, or double-word aligned) to 361 * RAM if the TLB for the CPU we are running on requires this. 362 * This is typically used when we are creating PMD entries. 363 * 364 * clean_pmd_entry 365 * 366 * Clean (but don't drain the write buffer) if the CPU requires 367 * these operations. This is typically used when we are removing 368 * PMD entries. 369 */ 370static inline void flush_pmd_entry(pmd_t *pmd) 371{ 372 const unsigned int zero = 0; 373 const unsigned int __tlb_flag = __cpu_tlb_flags; 374 375 if (tlb_flag(TLB_DCLEAN)) 376 asm("mcr%? p15, 0, %0, c7, c10, 1 @ flush_pmd" 377 : : "r" (pmd)); 378 if (tlb_flag(TLB_WB)) 379 asm("mcr%? p15, 0, %0, c7, c10, 4 @ flush_pmd" 380 : : "r" (zero)); 381} 382 383static inline void clean_pmd_entry(pmd_t *pmd) 384{ 385 const unsigned int __tlb_flag = __cpu_tlb_flags; 386 387 if (tlb_flag(TLB_DCLEAN)) 388 asm("mcr%? p15, 0, %0, c7, c10, 1 @ flush_pmd" 389 : : "r" (pmd)); 390} 391 392#undef tlb_flag 393#undef always_tlb_flags 394#undef possible_tlb_flags 395 396/* 397 * Convert calls to our calling convention. 398 */ 399#define local_flush_tlb_range(vma,start,end) __cpu_flush_user_tlb_range(start,end,vma) 400#define local_flush_tlb_kernel_range(s,e) __cpu_flush_kern_tlb_range(s,e) 401 402#ifndef CONFIG_SMP 403#define flush_tlb_all local_flush_tlb_all 404#define flush_tlb_mm local_flush_tlb_mm 405#define flush_tlb_page local_flush_tlb_page 406#define flush_tlb_kernel_page local_flush_tlb_kernel_page 407#define flush_tlb_range local_flush_tlb_range 408#define flush_tlb_kernel_range local_flush_tlb_kernel_range 409#else 410extern void flush_tlb_all(void); 411extern void flush_tlb_mm(struct mm_struct *mm); 412extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr); 413extern void flush_tlb_kernel_page(unsigned long kaddr); 414extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); 415extern void flush_tlb_kernel_range(unsigned long start, unsigned long end); 416#endif 417 418/* 419 * if PG_dcache_dirty is set for the page, we need to ensure that any 420 * cache entries for the kernels virtual memory range are written 421 * back to the page. 422 */ 423extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t pte); 424 425/* 426 * ARM processors do not cache TLB tables in RAM. 427 */ 428#define flush_tlb_pgtables(mm,start,end) do { } while (0) 429 430#endif 431 432#endif /* CONFIG_MMU */ 433 434#endif 435