root/arch/mips/include/asm/pgtable.h

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INCLUDED FROM

DEFINITIONS

This source file includes following definitions.
  1. set_pte
  2. pte_clear
  3. set_pte
  4. pte_clear
  5. set_pte_at
  6. pte_write
  7. pte_dirty
  8. pte_young
  9. pte_special
  10. pte_wrprotect
  11. pte_mkclean
  12. pte_mkold
  13. pte_mkwrite
  14. pte_mkdirty
  15. pte_mkyoung
  16. pte_mkspecial
  17. pte_write
  18. pte_dirty
  19. pte_young
  20. pte_special
  21. pte_wrprotect
  22. pte_mkclean
  23. pte_mkold
  24. pte_mkwrite
  25. pte_mkdirty
  26. pte_mkyoung
  27. pte_mkspecial
  28. pte_huge
  29. pte_mkhuge
  30. pgprot_noncached
  31. pgprot_writecombine
  32. pte_modify
  33. pte_modify
  34. pte_modify
  35. update_mmu_cache
  36. update_mmu_cache_pmd
  37. io_remap_pfn_range
  38. pmd_trans_huge
  39. pmd_mkhuge
  40. pmd_write
  41. pmd_wrprotect
  42. pmd_mkwrite
  43. pmd_dirty
  44. pmd_mkclean
  45. pmd_mkdirty
  46. pmd_young
  47. pmd_mkold
  48. pmd_mkyoung
  49. pmd_pfn
  50. pmd_page
  51. pmd_modify
  52. pmd_mknotpresent
  53. pmdp_huge_get_and_clear
   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/cmpxchg.h>
  21 #include <asm/io.h>
  22 #include <asm/pgtable-bits.h>
  23 #include <asm/cpu-features.h>
  24 
  25 struct mm_struct;
  26 struct vm_area_struct;
  27 
  28 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_NO_READ | \
  29                                  _page_cachable_default)
  30 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
  31                                  _page_cachable_default)
  32 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_NO_EXEC | \
  33                                  _page_cachable_default)
  34 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | \
  35                                  _page_cachable_default)
  36 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  37                                  _PAGE_GLOBAL | _page_cachable_default)
  38 #define PAGE_KERNEL_NC  __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  39                                  _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
  40 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
  41                                  _page_cachable_default)
  42 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
  43                         __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
  44 
  45 /*
  46  * If _PAGE_NO_EXEC is not defined, we can't do page protection for
  47  * execute, and consider it to be the same as read. Also, write
  48  * permissions imply read permissions. This is the closest we can get
  49  * by reasonable means..
  50  */
  51 
  52 /*
  53  * Dummy values to fill the table in mmap.c
  54  * The real values will be generated at runtime
  55  */
  56 #define __P000 __pgprot(0)
  57 #define __P001 __pgprot(0)
  58 #define __P010 __pgprot(0)
  59 #define __P011 __pgprot(0)
  60 #define __P100 __pgprot(0)
  61 #define __P101 __pgprot(0)
  62 #define __P110 __pgprot(0)
  63 #define __P111 __pgprot(0)
  64 
  65 #define __S000 __pgprot(0)
  66 #define __S001 __pgprot(0)
  67 #define __S010 __pgprot(0)
  68 #define __S011 __pgprot(0)
  69 #define __S100 __pgprot(0)
  70 #define __S101 __pgprot(0)
  71 #define __S110 __pgprot(0)
  72 #define __S111 __pgprot(0)
  73 
  74 extern unsigned long _page_cachable_default;
  75 
  76 /*
  77  * ZERO_PAGE is a global shared page that is always zero; used
  78  * for zero-mapped memory areas etc..
  79  */
  80 
  81 extern unsigned long empty_zero_page;
  82 extern unsigned long zero_page_mask;
  83 
  84 #define ZERO_PAGE(vaddr) \
  85         (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
  86 #define __HAVE_COLOR_ZERO_PAGE
  87 
  88 extern void paging_init(void);
  89 
  90 /*
  91  * Conversion functions: convert a page and protection to a page entry,
  92  * and a page entry and page directory to the page they refer to.
  93  */
  94 #define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
  95 
  96 #define __pmd_page(pmd)         (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  97 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
  98 #define pmd_page(pmd)           __pmd_page(pmd)
  99 #endif /* CONFIG_TRANSPARENT_HUGEPAGE  */
 100 
 101 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
 102 
 103 #define htw_stop()                                                      \
 104 do {                                                                    \
 105         unsigned long flags;                                            \
 106                                                                         \
 107         if (cpu_has_htw) {                                              \
 108                 local_irq_save(flags);                                  \
 109                 if(!raw_current_cpu_data.htw_seq++) {                   \
 110                         write_c0_pwctl(read_c0_pwctl() &                \
 111                                        ~(1 << MIPS_PWCTL_PWEN_SHIFT));  \
 112                         back_to_back_c0_hazard();                       \
 113                 }                                                       \
 114                 local_irq_restore(flags);                               \
 115         }                                                               \
 116 } while(0)
 117 
 118 #define htw_start()                                                     \
 119 do {                                                                    \
 120         unsigned long flags;                                            \
 121                                                                         \
 122         if (cpu_has_htw) {                                              \
 123                 local_irq_save(flags);                                  \
 124                 if (!--raw_current_cpu_data.htw_seq) {                  \
 125                         write_c0_pwctl(read_c0_pwctl() |                \
 126                                        (1 << MIPS_PWCTL_PWEN_SHIFT));   \
 127                         back_to_back_c0_hazard();                       \
 128                 }                                                       \
 129                 local_irq_restore(flags);                               \
 130         }                                                               \
 131 } while(0)
 132 
 133 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 134                               pte_t *ptep, pte_t pteval);
 135 
 136 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 137 
 138 #ifdef CONFIG_XPA
 139 # define pte_none(pte)          (!(((pte).pte_high) & ~_PAGE_GLOBAL))
 140 #else
 141 # define pte_none(pte)          (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
 142 #endif
 143 
 144 #define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
 145 #define pte_no_exec(pte)        ((pte).pte_low & _PAGE_NO_EXEC)
 146 
 147 static inline void set_pte(pte_t *ptep, pte_t pte)
 148 {
 149         ptep->pte_high = pte.pte_high;
 150         smp_wmb();
 151         ptep->pte_low = pte.pte_low;
 152 
 153 #ifdef CONFIG_XPA
 154         if (pte.pte_high & _PAGE_GLOBAL) {
 155 #else
 156         if (pte.pte_low & _PAGE_GLOBAL) {
 157 #endif
 158                 pte_t *buddy = ptep_buddy(ptep);
 159                 /*
 160                  * Make sure the buddy is global too (if it's !none,
 161                  * it better already be global)
 162                  */
 163                 if (pte_none(*buddy)) {
 164                         if (!IS_ENABLED(CONFIG_XPA))
 165                                 buddy->pte_low |= _PAGE_GLOBAL;
 166                         buddy->pte_high |= _PAGE_GLOBAL;
 167                 }
 168         }
 169 }
 170 
 171 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 172 {
 173         pte_t null = __pte(0);
 174 
 175         htw_stop();
 176         /* Preserve global status for the pair */
 177         if (IS_ENABLED(CONFIG_XPA)) {
 178                 if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
 179                         null.pte_high = _PAGE_GLOBAL;
 180         } else {
 181                 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
 182                         null.pte_low = null.pte_high = _PAGE_GLOBAL;
 183         }
 184 
 185         set_pte_at(mm, addr, ptep, null);
 186         htw_start();
 187 }
 188 #else
 189 
 190 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 191 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 192 #define pte_no_exec(pte)        (pte_val(pte) & _PAGE_NO_EXEC)
 193 
 194 /*
 195  * Certain architectures need to do special things when pte's
 196  * within a page table are directly modified.  Thus, the following
 197  * hook is made available.
 198  */
 199 static inline void set_pte(pte_t *ptep, pte_t pteval)
 200 {
 201         *ptep = pteval;
 202 #if !defined(CONFIG_CPU_R3K_TLB)
 203         if (pte_val(pteval) & _PAGE_GLOBAL) {
 204                 pte_t *buddy = ptep_buddy(ptep);
 205                 /*
 206                  * Make sure the buddy is global too (if it's !none,
 207                  * it better already be global)
 208                  */
 209 # if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32)
 210                 cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
 211 # else
 212                 cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL);
 213 # endif
 214         }
 215 #endif
 216 }
 217 
 218 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 219 {
 220         htw_stop();
 221 #if !defined(CONFIG_CPU_R3K_TLB)
 222         /* Preserve global status for the pair */
 223         if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
 224                 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
 225         else
 226 #endif
 227                 set_pte_at(mm, addr, ptep, __pte(0));
 228         htw_start();
 229 }
 230 #endif
 231 
 232 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 233                               pte_t *ptep, pte_t pteval)
 234 {
 235         extern void __update_cache(unsigned long address, pte_t pte);
 236 
 237         if (!pte_present(pteval))
 238                 goto cache_sync_done;
 239 
 240         if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
 241                 goto cache_sync_done;
 242 
 243         __update_cache(addr, pteval);
 244 cache_sync_done:
 245         set_pte(ptep, pteval);
 246 }
 247 
 248 /*
 249  * (pmds are folded into puds so this doesn't get actually called,
 250  * but the define is needed for a generic inline function.)
 251  */
 252 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
 253 
 254 #ifndef __PAGETABLE_PMD_FOLDED
 255 /*
 256  * (puds are folded into pgds so this doesn't get actually called,
 257  * but the define is needed for a generic inline function.)
 258  */
 259 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 260 #endif
 261 
 262 #define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
 263 #define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
 264 #define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
 265 
 266 /*
 267  * We used to declare this array with size but gcc 3.3 and older are not able
 268  * to find that this expression is a constant, so the size is dropped.
 269  */
 270 extern pgd_t swapper_pg_dir[];
 271 
 272 /*
 273  * The following only work if pte_present() is true.
 274  * Undefined behaviour if not..
 275  */
 276 #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 277 static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
 278 static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
 279 static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
 280 static inline int pte_special(pte_t pte) { return pte.pte_low & _PAGE_SPECIAL; }
 281 
 282 static inline pte_t pte_wrprotect(pte_t pte)
 283 {
 284         pte.pte_low  &= ~_PAGE_WRITE;
 285         if (!IS_ENABLED(CONFIG_XPA))
 286                 pte.pte_low &= ~_PAGE_SILENT_WRITE;
 287         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 288         return pte;
 289 }
 290 
 291 static inline pte_t pte_mkclean(pte_t pte)
 292 {
 293         pte.pte_low  &= ~_PAGE_MODIFIED;
 294         if (!IS_ENABLED(CONFIG_XPA))
 295                 pte.pte_low &= ~_PAGE_SILENT_WRITE;
 296         pte.pte_high &= ~_PAGE_SILENT_WRITE;
 297         return pte;
 298 }
 299 
 300 static inline pte_t pte_mkold(pte_t pte)
 301 {
 302         pte.pte_low  &= ~_PAGE_ACCESSED;
 303         if (!IS_ENABLED(CONFIG_XPA))
 304                 pte.pte_low &= ~_PAGE_SILENT_READ;
 305         pte.pte_high &= ~_PAGE_SILENT_READ;
 306         return pte;
 307 }
 308 
 309 static inline pte_t pte_mkwrite(pte_t pte)
 310 {
 311         pte.pte_low |= _PAGE_WRITE;
 312         if (pte.pte_low & _PAGE_MODIFIED) {
 313                 if (!IS_ENABLED(CONFIG_XPA))
 314                         pte.pte_low |= _PAGE_SILENT_WRITE;
 315                 pte.pte_high |= _PAGE_SILENT_WRITE;
 316         }
 317         return pte;
 318 }
 319 
 320 static inline pte_t pte_mkdirty(pte_t pte)
 321 {
 322         pte.pte_low |= _PAGE_MODIFIED;
 323         if (pte.pte_low & _PAGE_WRITE) {
 324                 if (!IS_ENABLED(CONFIG_XPA))
 325                         pte.pte_low |= _PAGE_SILENT_WRITE;
 326                 pte.pte_high |= _PAGE_SILENT_WRITE;
 327         }
 328         return pte;
 329 }
 330 
 331 static inline pte_t pte_mkyoung(pte_t pte)
 332 {
 333         pte.pte_low |= _PAGE_ACCESSED;
 334         if (!(pte.pte_low & _PAGE_NO_READ)) {
 335                 if (!IS_ENABLED(CONFIG_XPA))
 336                         pte.pte_low |= _PAGE_SILENT_READ;
 337                 pte.pte_high |= _PAGE_SILENT_READ;
 338         }
 339         return pte;
 340 }
 341 
 342 static inline pte_t pte_mkspecial(pte_t pte)
 343 {
 344         pte.pte_low |= _PAGE_SPECIAL;
 345         return pte;
 346 }
 347 #else
 348 static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
 349 static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
 350 static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
 351 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }
 352 
 353 static inline pte_t pte_wrprotect(pte_t pte)
 354 {
 355         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 356         return pte;
 357 }
 358 
 359 static inline pte_t pte_mkclean(pte_t pte)
 360 {
 361         pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 362         return pte;
 363 }
 364 
 365 static inline pte_t pte_mkold(pte_t pte)
 366 {
 367         pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
 368         return pte;
 369 }
 370 
 371 static inline pte_t pte_mkwrite(pte_t pte)
 372 {
 373         pte_val(pte) |= _PAGE_WRITE;
 374         if (pte_val(pte) & _PAGE_MODIFIED)
 375                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 376         return pte;
 377 }
 378 
 379 static inline pte_t pte_mkdirty(pte_t pte)
 380 {
 381         pte_val(pte) |= _PAGE_MODIFIED;
 382         if (pte_val(pte) & _PAGE_WRITE)
 383                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 384         return pte;
 385 }
 386 
 387 static inline pte_t pte_mkyoung(pte_t pte)
 388 {
 389         pte_val(pte) |= _PAGE_ACCESSED;
 390         if (!(pte_val(pte) & _PAGE_NO_READ))
 391                 pte_val(pte) |= _PAGE_SILENT_READ;
 392         return pte;
 393 }
 394 
 395 static inline pte_t pte_mkspecial(pte_t pte)
 396 {
 397         pte_val(pte) |= _PAGE_SPECIAL;
 398         return pte;
 399 }
 400 
 401 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
 402 static inline int pte_huge(pte_t pte)   { return pte_val(pte) & _PAGE_HUGE; }
 403 
 404 static inline pte_t pte_mkhuge(pte_t pte)
 405 {
 406         pte_val(pte) |= _PAGE_HUGE;
 407         return pte;
 408 }
 409 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
 410 #endif
 411 
 412 /*
 413  * Macro to make mark a page protection value as "uncacheable".  Note
 414  * that "protection" is really a misnomer here as the protection value
 415  * contains the memory attribute bits, dirty bits, and various other
 416  * bits as well.
 417  */
 418 #define pgprot_noncached pgprot_noncached
 419 
 420 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 421 {
 422         unsigned long prot = pgprot_val(_prot);
 423 
 424         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 425 
 426         return __pgprot(prot);
 427 }
 428 
 429 #define pgprot_writecombine pgprot_writecombine
 430 
 431 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 432 {
 433         unsigned long prot = pgprot_val(_prot);
 434 
 435         /* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
 436         prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
 437 
 438         return __pgprot(prot);
 439 }
 440 
 441 /*
 442  * Conversion functions: convert a page and protection to a page entry,
 443  * and a page entry and page directory to the page they refer to.
 444  */
 445 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 446 
 447 #if defined(CONFIG_XPA)
 448 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 449 {
 450         pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
 451         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
 452         pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
 453         pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
 454         return pte;
 455 }
 456 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
 457 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 458 {
 459         pte.pte_low  &= _PAGE_CHG_MASK;
 460         pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
 461         pte.pte_low  |= pgprot_val(newprot);
 462         pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
 463         return pte;
 464 }
 465 #else
 466 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 467 {
 468         return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
 469                      (pgprot_val(newprot) & ~_PAGE_CHG_MASK));
 470 }
 471 #endif
 472 
 473 
 474 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
 475         pte_t pte);
 476 
 477 static inline void update_mmu_cache(struct vm_area_struct *vma,
 478         unsigned long address, pte_t *ptep)
 479 {
 480         pte_t pte = *ptep;
 481         __update_tlb(vma, address, pte);
 482 }
 483 
 484 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 485         unsigned long address, pmd_t *pmdp)
 486 {
 487         pte_t pte = *(pte_t *)pmdp;
 488 
 489         __update_tlb(vma, address, pte);
 490 }
 491 
 492 #define kern_addr_valid(addr)   (1)
 493 
 494 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 495 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
 496 
 497 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 498                 unsigned long vaddr,
 499                 unsigned long pfn,
 500                 unsigned long size,
 501                 pgprot_t prot)
 502 {
 503         phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
 504         return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
 505 }
 506 #define io_remap_pfn_range io_remap_pfn_range
 507 #endif
 508 
 509 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 510 
 511 /* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
 512 #define pmdp_establish generic_pmdp_establish
 513 
 514 #define has_transparent_hugepage has_transparent_hugepage
 515 extern int has_transparent_hugepage(void);
 516 
 517 static inline int pmd_trans_huge(pmd_t pmd)
 518 {
 519         return !!(pmd_val(pmd) & _PAGE_HUGE);
 520 }
 521 
 522 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 523 {
 524         pmd_val(pmd) |= _PAGE_HUGE;
 525 
 526         return pmd;
 527 }
 528 
 529 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 530                        pmd_t *pmdp, pmd_t pmd);
 531 
 532 #define pmd_write pmd_write
 533 static inline int pmd_write(pmd_t pmd)
 534 {
 535         return !!(pmd_val(pmd) & _PAGE_WRITE);
 536 }
 537 
 538 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 539 {
 540         pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 541         return pmd;
 542 }
 543 
 544 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 545 {
 546         pmd_val(pmd) |= _PAGE_WRITE;
 547         if (pmd_val(pmd) & _PAGE_MODIFIED)
 548                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 549 
 550         return pmd;
 551 }
 552 
 553 static inline int pmd_dirty(pmd_t pmd)
 554 {
 555         return !!(pmd_val(pmd) & _PAGE_MODIFIED);
 556 }
 557 
 558 static inline pmd_t pmd_mkclean(pmd_t pmd)
 559 {
 560         pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
 561         return pmd;
 562 }
 563 
 564 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 565 {
 566         pmd_val(pmd) |= _PAGE_MODIFIED;
 567         if (pmd_val(pmd) & _PAGE_WRITE)
 568                 pmd_val(pmd) |= _PAGE_SILENT_WRITE;
 569 
 570         return pmd;
 571 }
 572 
 573 static inline int pmd_young(pmd_t pmd)
 574 {
 575         return !!(pmd_val(pmd) & _PAGE_ACCESSED);
 576 }
 577 
 578 static inline pmd_t pmd_mkold(pmd_t pmd)
 579 {
 580         pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 581 
 582         return pmd;
 583 }
 584 
 585 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 586 {
 587         pmd_val(pmd) |= _PAGE_ACCESSED;
 588 
 589         if (!(pmd_val(pmd) & _PAGE_NO_READ))
 590                 pmd_val(pmd) |= _PAGE_SILENT_READ;
 591 
 592         return pmd;
 593 }
 594 
 595 /* Extern to avoid header file madness */
 596 extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
 597 
 598 static inline unsigned long pmd_pfn(pmd_t pmd)
 599 {
 600         return pmd_val(pmd) >> _PFN_SHIFT;
 601 }
 602 
 603 static inline struct page *pmd_page(pmd_t pmd)
 604 {
 605         if (pmd_trans_huge(pmd))
 606                 return pfn_to_page(pmd_pfn(pmd));
 607 
 608         return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
 609 }
 610 
 611 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 612 {
 613         pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
 614                        (pgprot_val(newprot) & ~_PAGE_CHG_MASK);
 615         return pmd;
 616 }
 617 
 618 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 619 {
 620         pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
 621 
 622         return pmd;
 623 }
 624 
 625 /*
 626  * The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
 627  * different prototype.
 628  */
 629 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
 630 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
 631                                             unsigned long address, pmd_t *pmdp)
 632 {
 633         pmd_t old = *pmdp;
 634 
 635         pmd_clear(pmdp);
 636 
 637         return old;
 638 }
 639 
 640 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 641 
 642 #define gup_fast_permitted(start, end)  (!cpu_has_dc_aliases)
 643 
 644 #include <asm-generic/pgtable.h>
 645 
 646 /*
 647  * uncached accelerated TLB map for video memory access
 648  */
 649 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
 650 #define __HAVE_PHYS_MEM_ACCESS_PROT
 651 
 652 struct file;
 653 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 654                 unsigned long size, pgprot_t vma_prot);
 655 #endif
 656 
 657 /*
 658  * We provide our own get_unmapped area to cope with the virtual aliasing
 659  * constraints placed on us by the cache architecture.
 660  */
 661 #define HAVE_ARCH_UNMAPPED_AREA
 662 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
 663 
 664 #endif /* _ASM_PGTABLE_H */
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