arch/mips/include/asm/pgtable.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2003 Ralf Baechle
   7  */
   8 #ifndef _ASM_PGTABLE_H
   9 #define _ASM_PGTABLE_H
  10
  11 #include <linux/mm_types.h>
  12 #include <linux/mmzone.h>
  13 #ifdef CONFIG_32BIT
  14 #include <asm/pgtable-32.h>
  15 #endif
  16 #ifdef CONFIG_64BIT
  17 #include <asm/pgtable-64.h>
  18 #endif
  19
  20 #include <asm/io.h>
  21 #include <asm/pgtable-bits.h>
  22
  23 struct mm_struct;
  24 struct vm_area_struct;
  25
  26 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \
  27                                  _page_cachable_default)
  28 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
  29                                  _page_cachable_default)
  30 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \
  31                                  _page_cachable_default)
  32 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | \
  33                                  _page_cachable_default)
  34 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  35                                  _PAGE_GLOBAL | _page_cachable_default)
  36 #define PAGE_KERNEL_NC  __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  37                                  _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
  38 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
  39                                  _page_cachable_default)
  40 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
  41                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
  42
  43 /*
  44  * If _PAGE_NO_EXEC is not defined, we can't do page protection for
  45  * execute, and consider it to be the same as read. Also, write
  46  * permissions imply read permissions. This is the closest we can get
  47  * by reasonable means..
  48  */
  49
  50 /*
  51  * Dummy values to fill the table in mmap.c
  52  * The real values will be generated at runtime
  53  */
  54 #define __P000 __pgprot(0)
  55 #define __P001 __pgprot(0)
  56 #define __P010 __pgprot(0)
  57 #define __P011 __pgprot(0)
  58 #define __P100 __pgprot(0)
  59 #define __P101 __pgprot(0)
  60 #define __P110 __pgprot(0)
  61 #define __P111 __pgprot(0)
  62
  63 #define __S000 __pgprot(0)
  64 #define __S001 __pgprot(0)
  65 #define __S010 __pgprot(0)
  66 #define __S011 __pgprot(0)
  67 #define __S100 __pgprot(0)
  68 #define __S101 __pgprot(0)
  69 #define __S110 __pgprot(0)
  70 #define __S111 __pgprot(0)
  71
  72 extern unsigned long _page_cachable_default;
  73
  74 /*
  75  * ZERO_PAGE is a global shared page that is always zero; used
  76  * for zero-mapped memory areas etc..
  77  */
  78
  79 extern unsigned long empty_zero_page;
  80 extern unsigned long zero_page_mask;
  81
  82 #define ZERO_PAGE(vaddr) \
  83         (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  84 #define __HAVE_COLOR_ZERO_PAGE
  85
  86 extern void paging_init(void);
  87
  88 /*
  89  * Conversion functions: convert a page and protection to a page entry,
  90  * and a page entry and page directory to the page they refer to.
  91  */
  92 #define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  93
  94 #define __pmd_page(pmd)         (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  95 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
  96 #define pmd_page(pmd)           __pmd_page(pmd)
  97 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
  98
  99 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
 100
 101 #define htw_stop()                                                      \
 102 do {                                                                    \
 103         unsigned long flags;                                            \
 104                                                                         \
 105         if (cpu_has_htw) {                                              \
 106                 local_irq_save(flags);                                  \
 107                 if(!raw_current_cpu_data.htw_seq++) {                   \
 108                         write_c0_pwctl(read_c0_pwctl() &                \
 109                                        ~(1 << MIPS_PWCTL_PWEN_SHIFT));  \
 110                         back_to_back_c0_hazard();                       \
 111                 }                                                       \
 112                 local_irq_restore(flags);                               \
 113         }                                                               \
 114 } while(0)
 115
 116 #define htw_start()                                                     \
 117 do {                                                                    \
 118         unsigned long flags;                                            \
 119                                                                         \
 120         if (cpu_has_htw) {                                              \
 121                 local_irq_save(flags);                                  \
 122                 if (!--raw_current_cpu_data.htw_seq) {                  \
 123                         write_c0_pwctl(read_c0_pwctl() |                \
 124                                        (1 << MIPS_PWCTL_PWEN_SHIFT));   \
 125                         back_to_back_c0_hazard();                       \
 126                 }                                                       \
 127                 local_irq_restore(flags);                               \
 128         }                                                               \
 129 } while(0)
 130
 131 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 132                               pte_t *ptep, pte_t pteval);
 133
 134 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 135
 136 #ifdef CONFIG_XPA
 137 # define pte_none(pte)          (!(((pte).pte_high) & ~_PAGE_GLOBAL))
 138 #else
 139 # define pte_none(pte)          (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
 140 #endif
 141
 142 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 143 #define pte_no_exec(pte)        ((pte).pte_low & _PAGE_NO_EXEC)
 144
 145 static inline void set_pte(pte_t *ptep, pte_t pte)
 146 {
 147         ptep->pte_high = pte.pte_high;
 148         smp_wmb();
 149         ptep->pte_low = pte.pte_low;
 150
 151 #ifdef CONFIG_XPA
 152         if (pte.pte_high & _PAGE_GLOBAL) {
 153 #else
 154         if (pte.pte_low & _PAGE_GLOBAL) {
 155 #endif
 156                 pte_t *buddy = ptep_buddy(ptep);
 157                 /*
 158                  * Make sure the buddy is global too (if it's !none,
 159                  * it better already be global)
 160                  */
 161                 if (pte_none(*buddy)) {
 162                         if (!IS_ENABLED(CONFIG_XPA))
 163                                 buddy->pte_low |= _PAGE_GLOBAL;
 164                         buddy->pte_high |= _PAGE_GLOBAL;
 165                 }
 166         }
 167 }
 168
 169 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 170 {
 171         pte_t null = __pte(0);
 172
 173         htw_stop();
 174         /* Preserve global status for the pair */
 175         if (IS_ENABLED(CONFIG_XPA)) {
 176                 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
 177                         null.pte_high = _PAGE_GLOBAL;
 178         } else {
 179                 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 180                         null.pte_low = null.pte_high = _PAGE_GLOBAL;
 181         }
 182
 183         set_pte_at(mm, addr, ptep, null);
 184         htw_start();
 185 }
 186 #else
 187
 188 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 189 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 190 #define pte_no_exec(pte)        (pte_val(pte) & _PAGE_NO_EXEC)
 191
 192 /*
 193  * Certain architectures need to do special things when pte's
 194  * within a page table are directly modified.  Thus, the following
 195  * hook is made available.
 196  */
 197 static inline void set_pte(pte_t *ptep, pte_t pteval)
 198 {
 199         *ptep = pteval;
 200 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 201         if (pte_val(pteval) & _PAGE_GLOBAL) {
 202                 pte_t *buddy = ptep_buddy(ptep);
 203                 /*
 204                  * Make sure the buddy is global too (if it's !none,
 205                  * it better already be global)
 206                  */
 207 #ifdef CONFIG_SMP
 208                 /*
 209                  * For SMP, multiple CPUs can race, so we need to do
 210                  * this atomically.
 211                  */
 212                 unsigned long page_global = _PAGE_GLOBAL;
 213                 unsigned long tmp;
 214
 215                 if (kernel_uses_llsc && R10000_LLSC_WAR) {
 216                         __asm__ __volatile__ (
 217                         "       .set    arch=r4000                      \n"
 218                         "       .set    push                            \n"
 219                         "       .set    noreorder                       \n"
 220                         "1:"    __LL    "%[tmp], %[buddy]               \n"
 221                         "       bnez    %[tmp], 2f                      \n"
 222                         "        or     %[tmp], %[tmp], %[global]       \n"
 223                                 __SC    "%[tmp], %[buddy]               \n"
 224                         "       beqzl   %[tmp], 1b                      \n"
 225                         "       nop                                     \n"
 226                         "2:                                             \n"
 227                         "       .set    pop                             \n"
 228                         "       .set    mips0                           \n"
 229                         : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
 230                         : [global] "r" (page_global));
 231                 } else if (kernel_uses_llsc) {
 232                         __asm__ __volatile__ (
 233                         "       .set    "MIPS_ISA_ARCH_LEVEL"           \n"
 234                         "       .set    push                            \n"
 235                         "       .set    noreorder                       \n"
 236                         "1:"    __LL    "%[tmp], %[buddy]               \n"
 237                         "       bnez    %[tmp], 2f                      \n"
 238                         "        or     %[tmp], %[tmp], %[global]       \n"
 239                                 __SC    "%[tmp], %[buddy]               \n"
 240                         "       beqz    %[tmp], 1b                      \n"
 241                         "       nop                                     \n"
 242                         "2:                                             \n"
 243                         "       .set    pop                             \n"
 244                         "       .set    mips0                           \n"
 245                         : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
 246                         : [global] "r" (page_global));
 247                 }
 248 #else /* !CONFIG_SMP */
 249                 if (pte_none(*buddy))
 250                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 251 #endif /* CONFIG_SMP */
 252         }
 253 #endif
 254 }
 255
 256 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 257 {
 258         htw_stop();
 259 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 260         /* Preserve global status for the pair */
 261         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 262                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 263         else
 264 #endif
 265                 set_pte_at(mm, addr, ptep, __pte(0));
 266         htw_start();
 267 }
 268 #endif
 269
 270 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 271                               pte_t *ptep, pte_t pteval)
 272 {
 273         extern void __update_cache(unsigned long address, pte_t pte);
 274
 275         if (!pte_present(pteval))
 276                 goto cache_sync_done;
 277
 278         if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
 279                 goto cache_sync_done;
 280
 281         __update_cache(addr, pteval);
 282 cache_sync_done:
 283         set_pte(ptep, pteval);
 284 }
 285
 286 /*
 287  * (pmds are folded into puds so this doesn't get actually called,
 288  * but the define is needed for a generic inline function.)
 289  */
 290 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 291
 292 #ifndef __PAGETABLE_PMD_FOLDED
 293 /*
 294  * (puds are folded into pgds so this doesn't get actually called,
 295  * but the define is needed for a generic inline function.)
 296  */
 297 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 298 #endif
 299
 300 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 301 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 302 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 303
 304 /*
 305  * We used to declare this array with size but gcc 3.3 and older are not able
 306  * to find that this expression is a constant, so the size is dropped.
 307  */
 308 extern pgd_t swapper_pg_dir[];
 309
 310 /*
 311  * The following only work if pte_present() is true.
 312  * Undefined behaviour if not..
 313  */
 314 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 315 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 316 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 317 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 318
 319 static inline pte_t pte_wrprotect(pte_t pte)
 320 {
 321         pte.pte_low  &= ~_PAGE_WRITE;
 322         if (!IS_ENABLED(CONFIG_XPA))
 323                 pte.pte_low &= ~_PAGE_SILENT_WRITE;
 324         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 325         return pte;
 326 }
 327
 328 static inline pte_t pte_mkclean(pte_t pte)
 329 {
 330         pte.pte_low  &= ~_PAGE_MODIFIED;
 331         if (!IS_ENABLED(CONFIG_XPA))
 332                 pte.pte_low &= ~_PAGE_SILENT_WRITE;
 333         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 334         return pte;
 335 }
 336
 337 static inline pte_t pte_mkold(pte_t pte)
 338 {
 339         pte.pte_low  &= ~_PAGE_ACCESSED;
 340         if (!IS_ENABLED(CONFIG_XPA))
 341                 pte.pte_low &= ~_PAGE_SILENT_READ;
 342         pte.pte_high &= ~_PAGE_SILENT_READ;
 343         return pte;
 344 }
 345
 346 static inline pte_t pte_mkwrite(pte_t pte)
 347 {
 348         pte.pte_low |= _PAGE_WRITE;
 349         if (pte.pte_low & _PAGE_MODIFIED) {
 350                 if (!IS_ENABLED(CONFIG_XPA))
 351                         pte.pte_low |= _PAGE_SILENT_WRITE;
 352                 pte.pte_high |= _PAGE_SILENT_WRITE;
 353         }
 354         return pte;
 355 }
 356
 357 static inline pte_t pte_mkdirty(pte_t pte)
 358 {
 359         pte.pte_low |= _PAGE_MODIFIED;
 360         if (pte.pte_low & _PAGE_WRITE) {
 361                 if (!IS_ENABLED(CONFIG_XPA))
 362                         pte.pte_low |= _PAGE_SILENT_WRITE;
 363                 pte.pte_high |= _PAGE_SILENT_WRITE;
 364         }
 365         return pte;
 366 }
 367
 368 static inline pte_t pte_mkyoung(pte_t pte)
 369 {
 370         pte.pte_low |= _PAGE_ACCESSED;
 371         if (!(pte.pte_low & _PAGE_NO_READ)) {
 372                 if (!IS_ENABLED(CONFIG_XPA))
 373                         pte.pte_low |= _PAGE_SILENT_READ;
 374                 pte.pte_high |= _PAGE_SILENT_READ;
 375         }
 376         return pte;
 377 }
 378 #else
 379 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 380 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 381 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 382
 383 static inline pte_t pte_wrprotect(pte_t pte)
 384 {
 385         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 386         return pte;
 387 }
 388
 389 static inline pte_t pte_mkclean(pte_t pte)
 390 {
 391         pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 392         return pte;
 393 }
 394
 395 static inline pte_t pte_mkold(pte_t pte)
 396 {
 397         pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 398         return pte;
 399 }
 400
 401 static inline pte_t pte_mkwrite(pte_t pte)
 402 {
 403         pte_val(pte) |= _PAGE_WRITE;
 404         if (pte_val(pte) & _PAGE_MODIFIED)
 405                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 406         return pte;
 407 }
 408
 409 static inline pte_t pte_mkdirty(pte_t pte)
 410 {
 411         pte_val(pte) |= _PAGE_MODIFIED;
 412         if (pte_val(pte) & _PAGE_WRITE)
 413                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 414         return pte;
 415 }
 416
 417 static inline pte_t pte_mkyoung(pte_t pte)
 418 {
 419         pte_val(pte) |= _PAGE_ACCESSED;
 420         if (!(pte_val(pte) & _PAGE_NO_READ))
 421                 pte_val(pte) |= _PAGE_SILENT_READ;
 422         return pte;
 423 }
 424
 425 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
 426 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 427
 428 static inline pte_t pte_mkhuge(pte_t pte)
 429 {
 430         pte_val(pte) |= _PAGE_HUGE;
 431         return pte;
 432 }
 433 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
 434 #endif
 435 static inline int pte_special(pte_t pte)        { return 0; }
 436 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 437
 438 /*
 439  * Macro to make mark a page protection value as "uncacheable".  Note
 440  * that "protection" is really a misnomer here as the protection value
 441  * contains the memory attribute bits, dirty bits, and various other
 442  * bits as well.
 443  */
 444 #define pgprot_noncached pgprot_noncached
 445
 446 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 447 {
 448         unsigned long prot = pgprot_val(_prot);
 449
 450         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 451
 452         return __pgprot(prot);
 453 }
 454
 455 #define pgprot_writecombine pgprot_writecombine
 456
 457 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 458 {
 459         unsigned long prot = pgprot_val(_prot);
 460
 461         /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
 462         prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
 463
 464         return __pgprot(prot);
 465 }
 466
 467 /*
 468  * Conversion functions: convert a page and protection to a page entry,
 469  * and a page entry and page directory to the page they refer to.
 470  */
 471 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 472
 473 #if defined(CONFIG_XPA)
 474 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 475 {
 476         pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
 477         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
 478         pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
 479         pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
 480         return pte;
 481 }
 482 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 483 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 484 {
 485         pte.pte_low  &= _PAGE_CHG_MASK;
 486         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
 487         pte.pte_low  |= pgprot_val(newprot);
 488         pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
 489         return pte;
 490 }
 491 #else
 492 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 493 {
 494         return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
 495                      (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
 496 }
 497 #endif
 498
 499
 500 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 501         pte_t pte);
 502
 503 static inline void update_mmu_cache(struct vm_area_struct *vma,
 504         unsigned long address, pte_t *ptep)
 505 {
 506         pte_t pte = *ptep;
 507         __update_tlb(vma, address, pte);
 508 }
 509
 510 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 511         unsigned long address, pmd_t *pmdp)
 512 {
 513         pte_t pte = *(pte_t *)pmdp;
 514
 515         __update_tlb(vma, address, pte);
 516 }
 517
 518 #define kern_addr_valid(addr)   (1)
 519
 520 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 521 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 522
 523 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 524                 unsigned long vaddr,
 525                 unsigned long pfn,
 526                 unsigned long size,
 527                 pgprot_t prot)
 528 {
 529         phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 530         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 531 }
 532 #define io_remap_pfn_range io_remap_pfn_range
 533 #endif
 534
 535 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 536
 537 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
 538 #define pmdp_establish generic_pmdp_establish
 539
 540 #define has_transparent_hugepage has_transparent_hugepage
 541 extern int has_transparent_hugepage(void);
 542
 543 static inline int pmd_trans_huge(pmd_t pmd)
 544 {
 545         return !!(pmd_val(pmd) & _PAGE_HUGE);
 546 }
 547
 548 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 549 {
 550         pmd_val(pmd) |= _PAGE_HUGE;
 551
 552         return pmd;
 553 }
 554
 555 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 556                        pmd_t *pmdp, pmd_t pmd);
 557
 558 #define pmd_write pmd_write
 559 static inline int pmd_write(pmd_t pmd)
 560 {
 561         return !!(pmd_val(pmd) & _PAGE_WRITE);
 562 }
 563
 564 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 565 {
 566         pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 567         return pmd;
 568 }
 569
 570 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 571 {
 572         pmd_val(pmd) |= _PAGE_WRITE;
 573         if (pmd_val(pmd) & _PAGE_MODIFIED)
 574                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 575
 576         return pmd;
 577 }
 578
 579 static inline int pmd_dirty(pmd_t pmd)
 580 {
 581         return !!(pmd_val(pmd) & _PAGE_MODIFIED);
 582 }
 583
 584 static inline pmd_t pmd_mkclean(pmd_t pmd)
 585 {
 586         pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 587         return pmd;
 588 }
 589
 590 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 591 {
 592         pmd_val(pmd) |= _PAGE_MODIFIED;
 593         if (pmd_val(pmd) & _PAGE_WRITE)
 594                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 595
 596         return pmd;
 597 }
 598
 599 static inline int pmd_young(pmd_t pmd)
 600 {
 601         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
 602 }
 603
 604 static inline pmd_t pmd_mkold(pmd_t pmd)
 605 {
 606         pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 607
 608         return pmd;
 609 }
 610
 611 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 612 {
 613         pmd_val(pmd) |= _PAGE_ACCESSED;
 614
 615         if (!(pmd_val(pmd) & _PAGE_NO_READ))
 616                 pmd_val(pmd) |= _PAGE_SILENT_READ;
 617
 618         return pmd;
 619 }
 620
 621 /* Extern to avoid header file madness */
 622 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
 623
 624 static inline unsigned long pmd_pfn(pmd_t pmd)
 625 {
 626         return pmd_val(pmd) >> _PFN_SHIFT;
 627 }
 628
 629 static inline struct page *pmd_page(pmd_t pmd)
 630 {
 631         if (pmd_trans_huge(pmd))
 632                 return pfn_to_page(pmd_pfn(pmd));
 633
 634         return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
 635 }
 636
 637 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 638 {
 639         pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
 640                        (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
 641         return pmd;
 642 }
 643
 644 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 645 {
 646         pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
 647
 648         return pmd;
 649 }
 650
 651 /*
 652  * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
 653  * different prototype.
 654  */
 655 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
 656 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
 657                                             unsigned long address, pmd_t *pmdp)
 658 {
 659         pmd_t old = *pmdp;
 660
 661         pmd_clear(pmdp);
 662
 663         return old;
 664 }
 665
 666 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 667
 668 #include <asm-generic/pgtable.h>
 669
 670 /*
 671  * uncached accelerated TLB map for video memory access
 672  */
 673 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
 674 #define __HAVE_PHYS_MEM_ACCESS_PROT
 675
 676 struct file;
 677 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 678                 unsigned long size, pgprot_t vma_prot);
 679 #endif
 680
 681 /*
 682  * We provide our own get_unmapped area to cope with the virtual aliasing
 683  * constraints placed on us by the cache architecture.
 684  */
 685 #define HAVE_ARCH_UNMAPPED_AREA
 686 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 687
 688 /*
 689  * No page table caches to initialise
 690  */
 691 #define pgtable_cache_init()    do { } while (0)
 692
 693 #endif /* _ASM_PGTABLE_H */