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 | _CACHE_CACHABLE_NONCOHERENT)
  27 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | _PAGE_READ | \
  28                                  _page_cachable_default)
  29 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_NO_EXEC | \
  30                                  _page_cachable_default)
  31 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | \
  32                                  _page_cachable_default)
  33 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  34                                  _PAGE_GLOBAL | _page_cachable_default)
  35 #define PAGE_KERNEL_NC  __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  36                                  _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
  37 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  38                                  _page_cachable_default)
  39 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
  40                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
  41
  42 /*
  43  * If _PAGE_NO_EXEC is not defined, we can't do page protection for
  44  * execute, and consider it to be the same as read. Also, write
  45  * permissions imply read permissions. This is the closest we can get
  46  * by reasonable means..
  47  */
  48
  49 /*
  50  * Dummy values to fill the table in mmap.c
  51  * The real values will be generated at runtime
  52  */
  53 #define __P000 __pgprot(0)
  54 #define __P001 __pgprot(0)
  55 #define __P010 __pgprot(0)
  56 #define __P011 __pgprot(0)
  57 #define __P100 __pgprot(0)
  58 #define __P101 __pgprot(0)
  59 #define __P110 __pgprot(0)
  60 #define __P111 __pgprot(0)
  61
  62 #define __S000 __pgprot(0)
  63 #define __S001 __pgprot(0)
  64 #define __S010 __pgprot(0)
  65 #define __S011 __pgprot(0)
  66 #define __S100 __pgprot(0)
  67 #define __S101 __pgprot(0)
  68 #define __S110 __pgprot(0)
  69 #define __S111 __pgprot(0)
  70
  71 extern unsigned long _page_cachable_default;
  72
  73 /*
  74  * ZERO_PAGE is a global shared page that is always zero; used
  75  * for zero-mapped memory areas etc..
  76  */
  77
  78 extern unsigned long empty_zero_page;
  79 extern unsigned long zero_page_mask;
  80
  81 #define ZERO_PAGE(vaddr) \
  82         (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  83 #define __HAVE_COLOR_ZERO_PAGE
  84
  85 extern void paging_init(void);
  86
  87 /*
  88  * Conversion functions: convert a page and protection to a page entry,
  89  * and a page entry and page directory to the page they refer to.
  90  */
  91 #define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  92
  93 #define __pmd_page(pmd)         (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  94 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
  95 #define pmd_page(pmd)           __pmd_page(pmd)
  96 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
  97
  98 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
  99
 100 #define htw_stop()                                                      \
 101 do {                                                                    \
 102         unsigned long flags;                                            \
 103                                                                         \
 104         if (cpu_has_htw) {                                              \
 105                 local_irq_save(flags);                                  \
 106                 if(!raw_current_cpu_data.htw_seq++) {                   \
 107                         write_c0_pwctl(read_c0_pwctl() &                \
 108                                        ~(1 << MIPS_PWCTL_PWEN_SHIFT));  \
 109                         back_to_back_c0_hazard();                       \
 110                 }                                                       \
 111                 local_irq_restore(flags);                               \
 112         }                                                               \
 113 } while(0)
 114
 115 #define htw_start()                                                     \
 116 do {                                                                    \
 117         unsigned long flags;                                            \
 118                                                                         \
 119         if (cpu_has_htw) {                                              \
 120                 local_irq_save(flags);                                  \
 121                 if (!--raw_current_cpu_data.htw_seq) {                  \
 122                         write_c0_pwctl(read_c0_pwctl() |                \
 123                                        (1 << MIPS_PWCTL_PWEN_SHIFT));   \
 124                         back_to_back_c0_hazard();                       \
 125                 }                                                       \
 126                 local_irq_restore(flags);                               \
 127         }                                                               \
 128 } while(0)
 129
 130 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 131                               pte_t *ptep, pte_t pteval);
 132
 133 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 134
 135 #define pte_none(pte)           (!(((pte).pte_high) & ~_PAGE_GLOBAL))
 136 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 137 #define pte_no_exec(pte)        ((pte).pte_low & _PAGE_NO_EXEC)
 138
 139 static inline void set_pte(pte_t *ptep, pte_t pte)
 140 {
 141         ptep->pte_high = pte.pte_high;
 142         smp_wmb();
 143         ptep->pte_low = pte.pte_low;
 144
 145         if (pte.pte_high & _PAGE_GLOBAL) {
 146                 pte_t *buddy = ptep_buddy(ptep);
 147                 /*
 148                  * Make sure the buddy is global too (if it's !none,
 149                  * it better already be global)
 150                  */
 151                 if (pte_none(*buddy))
 152                         buddy->pte_high |= _PAGE_GLOBAL;
 153         }
 154 }
 155
 156 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 157 {
 158         pte_t null = __pte(0);
 159
 160         htw_stop();
 161         /* Preserve global status for the pair */
 162         if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
 163                 null.pte_high = _PAGE_GLOBAL;
 164
 165         set_pte_at(mm, addr, ptep, null);
 166         htw_start();
 167 }
 168 #else
 169
 170 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 171 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 172 #define pte_no_exec(pte)        (pte_val(pte) & _PAGE_NO_EXEC)
 173
 174 /*
 175  * Certain architectures need to do special things when pte's
 176  * within a page table are directly modified.  Thus, the following
 177  * hook is made available.
 178  */
 179 static inline void set_pte(pte_t *ptep, pte_t pteval)
 180 {
 181         *ptep = pteval;
 182 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 183         if (pte_val(pteval) & _PAGE_GLOBAL) {
 184                 pte_t *buddy = ptep_buddy(ptep);
 185                 /*
 186                  * Make sure the buddy is global too (if it's !none,
 187                  * it better already be global)
 188                  */
 189 #ifdef CONFIG_SMP
 190                 /*
 191                  * For SMP, multiple CPUs can race, so we need to do
 192                  * this atomically.
 193                  */
 194 #ifdef CONFIG_64BIT
 195 #define LL_INSN "lld"
 196 #define SC_INSN "scd"
 197 #else /* CONFIG_32BIT */
 198 #define LL_INSN "ll"
 199 #define SC_INSN "sc"
 200 #endif
 201                 unsigned long page_global = _PAGE_GLOBAL;
 202                 unsigned long tmp;
 203
 204                 __asm__ __volatile__ (
 205                         "       .set    push\n"
 206                         "       .set    noreorder\n"
 207                         "1:     " LL_INSN "     %[tmp], %[buddy]\n"
 208                         "       bnez    %[tmp], 2f\n"
 209                         "        or     %[tmp], %[tmp], %[global]\n"
 210                         "       " SC_INSN "     %[tmp], %[buddy]\n"
 211                         "       beqz    %[tmp], 1b\n"
 212                         "        nop\n"
 213                         "2:\n"
 214                         "       .set pop"
 215                         : [buddy] "+m" (buddy->pte),
 216                           [tmp] "=&r" (tmp)
 217                         : [global] "r" (page_global));
 218 #else /* !CONFIG_SMP */
 219                 if (pte_none(*buddy))
 220                         pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
 221 #endif /* CONFIG_SMP */
 222         }
 223 #endif
 224 }
 225
 226 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 227 {
 228         htw_stop();
 229 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
 230         /* Preserve global status for the pair */
 231         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 232                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 233         else
 234 #endif
 235                 set_pte_at(mm, addr, ptep, __pte(0));
 236         htw_start();
 237 }
 238 #endif
 239
 240 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 241                               pte_t *ptep, pte_t pteval)
 242 {
 243         extern void __update_cache(unsigned long address, pte_t pte);
 244
 245         if (!pte_present(pteval))
 246                 goto cache_sync_done;
 247
 248         if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
 249                 goto cache_sync_done;
 250
 251         __update_cache(addr, pteval);
 252 cache_sync_done:
 253         set_pte(ptep, pteval);
 254 }
 255
 256 /*
 257  * (pmds are folded into puds so this doesn't get actually called,
 258  * but the define is needed for a generic inline function.)
 259  */
 260 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 261
 262 #ifndef __PAGETABLE_PMD_FOLDED
 263 /*
 264  * (puds are folded into pgds so this doesn't get actually called,
 265  * but the define is needed for a generic inline function.)
 266  */
 267 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 268 #endif
 269
 270 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 271 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 272 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 273
 274 /*
 275  * We used to declare this array with size but gcc 3.3 and older are not able
 276  * to find that this expression is a constant, so the size is dropped.
 277  */
 278 extern pgd_t swapper_pg_dir[];
 279
 280 /*
 281  * The following only work if pte_present() is true.
 282  * Undefined behaviour if not..
 283  */
 284 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 285 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 286 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 287 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 288
 289 static inline pte_t pte_wrprotect(pte_t pte)
 290 {
 291         pte.pte_low  &= ~_PAGE_WRITE;
 292         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 293         return pte;
 294 }
 295
 296 static inline pte_t pte_mkclean(pte_t pte)
 297 {
 298         pte.pte_low  &= ~_PAGE_MODIFIED;
 299         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 300         return pte;
 301 }
 302
 303 static inline pte_t pte_mkold(pte_t pte)
 304 {
 305         pte.pte_low  &= ~_PAGE_ACCESSED;
 306         pte.pte_high &= ~_PAGE_SILENT_READ;
 307         return pte;
 308 }
 309
 310 static inline pte_t pte_mkwrite(pte_t pte)
 311 {
 312         pte.pte_low |= _PAGE_WRITE;
 313         if (pte.pte_low & _PAGE_MODIFIED)
 314                 pte.pte_high |= _PAGE_SILENT_WRITE;
 315         return pte;
 316 }
 317
 318 static inline pte_t pte_mkdirty(pte_t pte)
 319 {
 320         pte.pte_low |= _PAGE_MODIFIED;
 321         if (pte.pte_low & _PAGE_WRITE)
 322                 pte.pte_high |= _PAGE_SILENT_WRITE;
 323         return pte;
 324 }
 325
 326 static inline pte_t pte_mkyoung(pte_t pte)
 327 {
 328         pte.pte_low |= _PAGE_ACCESSED;
 329         if (pte.pte_low & _PAGE_READ)
 330                 pte.pte_high |= _PAGE_SILENT_READ;
 331         return pte;
 332 }
 333 #else
 334 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 335 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 336 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 337
 338 static inline pte_t pte_wrprotect(pte_t pte)
 339 {
 340         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 341         return pte;
 342 }
 343
 344 static inline pte_t pte_mkclean(pte_t pte)
 345 {
 346         pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 347         return pte;
 348 }
 349
 350 static inline pte_t pte_mkold(pte_t pte)
 351 {
 352         pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 353         return pte;
 354 }
 355
 356 static inline pte_t pte_mkwrite(pte_t pte)
 357 {
 358         pte_val(pte) |= _PAGE_WRITE;
 359         if (pte_val(pte) & _PAGE_MODIFIED)
 360                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 361         return pte;
 362 }
 363
 364 static inline pte_t pte_mkdirty(pte_t pte)
 365 {
 366         pte_val(pte) |= _PAGE_MODIFIED;
 367         if (pte_val(pte) & _PAGE_WRITE)
 368                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 369         return pte;
 370 }
 371
 372 static inline pte_t pte_mkyoung(pte_t pte)
 373 {
 374         pte_val(pte) |= _PAGE_ACCESSED;
 375 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
 376         if (!(pte_val(pte) & _PAGE_NO_READ))
 377                 pte_val(pte) |= _PAGE_SILENT_READ;
 378         else
 379 #endif
 380         if (pte_val(pte) & _PAGE_READ)
 381                 pte_val(pte) |= _PAGE_SILENT_READ;
 382         return pte;
 383 }
 384
 385 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
 386 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 387
 388 static inline pte_t pte_mkhuge(pte_t pte)
 389 {
 390         pte_val(pte) |= _PAGE_HUGE;
 391         return pte;
 392 }
 393 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
 394 #endif
 395 static inline int pte_special(pte_t pte)        { return 0; }
 396 static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
 397
 398 /*
 399  * Macro to make mark a page protection value as "uncacheable".  Note
 400  * that "protection" is really a misnomer here as the protection value
 401  * contains the memory attribute bits, dirty bits, and various other
 402  * bits as well.
 403  */
 404 #define pgprot_noncached pgprot_noncached
 405
 406 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 407 {
 408         unsigned long prot = pgprot_val(_prot);
 409
 410         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 411
 412         return __pgprot(prot);
 413 }
 414
 415 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 416 {
 417         unsigned long prot = pgprot_val(_prot);
 418
 419         /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
 420         prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
 421
 422         return __pgprot(prot);
 423 }
 424
 425 /*
 426  * Conversion functions: convert a page and protection to a page entry,
 427  * and a page entry and page directory to the page they refer to.
 428  */
 429 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 430
 431 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 432 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 433 {
 434         pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
 435         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
 436         pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
 437         pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK;
 438         return pte;
 439 }
 440 #else
 441 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 442 {
 443         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 444 }
 445 #endif
 446
 447
 448 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 449         pte_t pte);
 450
 451 static inline void update_mmu_cache(struct vm_area_struct *vma,
 452         unsigned long address, pte_t *ptep)
 453 {
 454         pte_t pte = *ptep;
 455         __update_tlb(vma, address, pte);
 456 }
 457
 458 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 459         unsigned long address, pmd_t *pmdp)
 460 {
 461         pte_t pte = *(pte_t *)pmdp;
 462
 463         __update_tlb(vma, address, pte);
 464 }
 465
 466 #define kern_addr_valid(addr)   (1)
 467
 468 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 469 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 470
 471 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 472                 unsigned long vaddr,
 473                 unsigned long pfn,
 474                 unsigned long size,
 475                 pgprot_t prot)
 476 {
 477         phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 478         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 479 }
 480 #define io_remap_pfn_range io_remap_pfn_range
 481 #endif
 482
 483 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 484
 485 extern int has_transparent_hugepage(void);
 486
 487 static inline int pmd_trans_huge(pmd_t pmd)
 488 {
 489         return !!(pmd_val(pmd) & _PAGE_HUGE);
 490 }
 491
 492 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 493 {
 494         pmd_val(pmd) |= _PAGE_HUGE;
 495
 496         return pmd;
 497 }
 498
 499 static inline int pmd_trans_splitting(pmd_t pmd)
 500 {
 501         return !!(pmd_val(pmd) & _PAGE_SPLITTING);
 502 }
 503
 504 static inline pmd_t pmd_mksplitting(pmd_t pmd)
 505 {
 506         pmd_val(pmd) |= _PAGE_SPLITTING;
 507
 508         return pmd;
 509 }
 510
 511 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 512                        pmd_t *pmdp, pmd_t pmd);
 513
 514 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 515 /* Extern to avoid header file madness */
 516 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 517                                         unsigned long address,
 518                                         pmd_t *pmdp);
 519
 520 #define __HAVE_ARCH_PMD_WRITE
 521 static inline int pmd_write(pmd_t pmd)
 522 {
 523         return !!(pmd_val(pmd) & _PAGE_WRITE);
 524 }
 525
 526 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 527 {
 528         pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 529         return pmd;
 530 }
 531
 532 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 533 {
 534         pmd_val(pmd) |= _PAGE_WRITE;
 535         if (pmd_val(pmd) & _PAGE_MODIFIED)
 536                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 537
 538         return pmd;
 539 }
 540
 541 static inline int pmd_dirty(pmd_t pmd)
 542 {
 543         return !!(pmd_val(pmd) & _PAGE_MODIFIED);
 544 }
 545
 546 static inline pmd_t pmd_mkclean(pmd_t pmd)
 547 {
 548         pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 549         return pmd;
 550 }
 551
 552 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 553 {
 554         pmd_val(pmd) |= _PAGE_MODIFIED;
 555         if (pmd_val(pmd) & _PAGE_WRITE)
 556                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 557
 558         return pmd;
 559 }
 560
 561 static inline int pmd_young(pmd_t pmd)
 562 {
 563         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
 564 }
 565
 566 static inline pmd_t pmd_mkold(pmd_t pmd)
 567 {
 568         pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 569
 570         return pmd;
 571 }
 572
 573 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 574 {
 575         pmd_val(pmd) |= _PAGE_ACCESSED;
 576
 577 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
 578         if (!(pmd_val(pmd) & _PAGE_NO_READ))
 579                 pmd_val(pmd) |= _PAGE_SILENT_READ;
 580         else
 581 #endif
 582         if (pmd_val(pmd) & _PAGE_READ)
 583                 pmd_val(pmd) |= _PAGE_SILENT_READ;
 584
 585         return pmd;
 586 }
 587
 588 /* Extern to avoid header file madness */
 589 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
 590
 591 static inline unsigned long pmd_pfn(pmd_t pmd)
 592 {
 593         return pmd_val(pmd) >> _PFN_SHIFT;
 594 }
 595
 596 static inline struct page *pmd_page(pmd_t pmd)
 597 {
 598         if (pmd_trans_huge(pmd))
 599                 return pfn_to_page(pmd_pfn(pmd));
 600
 601         return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
 602 }
 603
 604 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 605 {
 606         pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
 607                        (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
 608         return pmd;
 609 }
 610
 611 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 612 {
 613         pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
 614
 615         return pmd;
 616 }
 617
 618 /*
 619  * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
 620  * different prototype.
 621  */
 622 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
 623 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
 624                                        unsigned long address, pmd_t *pmdp)
 625 {
 626         pmd_t old = *pmdp;
 627
 628         pmd_clear(pmdp);
 629
 630         return old;
 631 }
 632
 633 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 634
 635 #include <asm-generic/pgtable.h>
 636
 637 /*
 638  * uncached accelerated TLB map for video memory access
 639  */
 640 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
 641 #define __HAVE_PHYS_MEM_ACCESS_PROT
 642
 643 struct file;
 644 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 645                 unsigned long size, pgprot_t vma_prot);
 646 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 647                 unsigned long size, pgprot_t *vma_prot);
 648 #endif
 649
 650 /*
 651  * We provide our own get_unmapped area to cope with the virtual aliasing
 652  * constraints placed on us by the cache architecture.
 653  */
 654 #define HAVE_ARCH_UNMAPPED_AREA
 655 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 656
 657 /*
 658  * No page table caches to initialise
 659  */
 660 #define pgtable_cache_init()    do { } while (0)
 661
 662 #endif /* _ASM_PGTABLE_H */