include/asm-arm/tlbflush.h

   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
 147 struct 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
 166 extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long, struct vm_area_struct *);
 167 extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long);
 168
 169 #endif
 170
 171 extern 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
 244 static 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
 262 static 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
 290 static inline void
 291 local_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
 322 static 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  */
 370 static 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
 383 static 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
 410 extern void flush_tlb_all(void);
 411 extern void flush_tlb_mm(struct mm_struct *mm);
 412 extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr);
 413 extern void flush_tlb_kernel_page(unsigned long kaddr);
 414 extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
 415 extern 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  */
 423 extern 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