arch/x86/include/asm/pgtable.h

   1 #ifndef _ASM_X86_PGTABLE_H
   2 #define _ASM_X86_PGTABLE_H
   3
   4 #include <asm/page.h>
   5 #include <asm/e820.h>
   6
   7 #include <asm/pgtable_types.h>
   8
   9 /*
  10  * Macro to mark a page protection value as UC-
  11  */
  12 #define pgprot_noncached(prot)                                  \
  13         ((boot_cpu_data.x86 > 3)                                \
  14          ? (__pgprot(pgprot_val(prot) | _PAGE_CACHE_UC_MINUS))  \
  15          : (prot))
  16
  17 #ifndef __ASSEMBLY__
  18
  19 #include <asm/x86_init.h>
  20
  21 /*
  22  * ZERO_PAGE is a global shared page that is always zero: used
  23  * for zero-mapped memory areas etc..
  24  */
  25 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
  26 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  27
  28 extern spinlock_t pgd_lock;
  29 extern struct list_head pgd_list;
  30
  31 extern struct mm_struct *pgd_page_get_mm(struct page *page);
  32
  33 #ifdef CONFIG_PARAVIRT
  34 #include <asm/paravirt.h>
  35 #else  /* !CONFIG_PARAVIRT */
  36 #define set_pte(ptep, pte)              native_set_pte(ptep, pte)
  37 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
  38 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
  39
  40 #define set_pte_atomic(ptep, pte)                                       \
  41         native_set_pte_atomic(ptep, pte)
  42
  43 #define set_pmd(pmdp, pmd)              native_set_pmd(pmdp, pmd)
  44
  45 #ifndef __PAGETABLE_PUD_FOLDED
  46 #define set_pgd(pgdp, pgd)              native_set_pgd(pgdp, pgd)
  47 #define pgd_clear(pgd)                  native_pgd_clear(pgd)
  48 #endif
  49
  50 #ifndef set_pud
  51 # define set_pud(pudp, pud)             native_set_pud(pudp, pud)
  52 #endif
  53
  54 #ifndef __PAGETABLE_PMD_FOLDED
  55 #define pud_clear(pud)                  native_pud_clear(pud)
  56 #endif
  57
  58 #define pte_clear(mm, addr, ptep)       native_pte_clear(mm, addr, ptep)
  59 #define pmd_clear(pmd)                  native_pmd_clear(pmd)
  60
  61 #define pte_update(mm, addr, ptep)              do { } while (0)
  62 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
  63 #define pmd_update(mm, addr, ptep)              do { } while (0)
  64 #define pmd_update_defer(mm, addr, ptep)        do { } while (0)
  65
  66 #define pgd_val(x)      native_pgd_val(x)
  67 #define __pgd(x)        native_make_pgd(x)
  68
  69 #ifndef __PAGETABLE_PUD_FOLDED
  70 #define pud_val(x)      native_pud_val(x)
  71 #define __pud(x)        native_make_pud(x)
  72 #endif
  73
  74 #ifndef __PAGETABLE_PMD_FOLDED
  75 #define pmd_val(x)      native_pmd_val(x)
  76 #define __pmd(x)        native_make_pmd(x)
  77 #endif
  78
  79 #define pte_val(x)      native_pte_val(x)
  80 #define __pte(x)        native_make_pte(x)
  81
  82 #define arch_end_context_switch(prev)   do {} while(0)
  83
  84 #endif  /* CONFIG_PARAVIRT */
  85
  86 /*
  87  * The following only work if pte_present() is true.
  88  * Undefined behaviour if not..
  89  */
  90 static inline int pte_dirty(pte_t pte)
  91 {
  92         return pte_flags(pte) & _PAGE_DIRTY;
  93 }
  94
  95 static inline int pte_young(pte_t pte)
  96 {
  97         return pte_flags(pte) & _PAGE_ACCESSED;
  98 }
  99
 100 static inline int pmd_young(pmd_t pmd)
 101 {
 102         return pmd_flags(pmd) & _PAGE_ACCESSED;
 103 }
 104
 105 static inline int pte_write(pte_t pte)
 106 {
 107         return pte_flags(pte) & _PAGE_RW;
 108 }
 109
 110 static inline int pte_file(pte_t pte)
 111 {
 112         return pte_flags(pte) & _PAGE_FILE;
 113 }
 114
 115 static inline int pte_huge(pte_t pte)
 116 {
 117         return pte_flags(pte) & _PAGE_PSE;
 118 }
 119
 120 static inline int pte_global(pte_t pte)
 121 {
 122         return pte_flags(pte) & _PAGE_GLOBAL;
 123 }
 124
 125 static inline int pte_exec(pte_t pte)
 126 {
 127         return !(pte_flags(pte) & _PAGE_NX);
 128 }
 129
 130 static inline int pte_special(pte_t pte)
 131 {
 132         return pte_flags(pte) & _PAGE_SPECIAL;
 133 }
 134
 135 static inline unsigned long pte_pfn(pte_t pte)
 136 {
 137         return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
 138 }
 139
 140 static inline unsigned long pmd_pfn(pmd_t pmd)
 141 {
 142         return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
 143 }
 144
 145 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 146
 147 static inline int pmd_large(pmd_t pte)
 148 {
 149         return (pmd_flags(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 150                 (_PAGE_PSE | _PAGE_PRESENT);
 151 }
 152
 153 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 154 static inline int pmd_trans_splitting(pmd_t pmd)
 155 {
 156         return pmd_val(pmd) & _PAGE_SPLITTING;
 157 }
 158
 159 static inline int pmd_trans_huge(pmd_t pmd)
 160 {
 161         return pmd_val(pmd) & _PAGE_PSE;
 162 }
 163
 164 static inline int has_transparent_hugepage(void)
 165 {
 166         return cpu_has_pse;
 167 }
 168 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 169
 170 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
 171 {
 172         pteval_t v = native_pte_val(pte);
 173
 174         return native_make_pte(v | set);
 175 }
 176
 177 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
 178 {
 179         pteval_t v = native_pte_val(pte);
 180
 181         return native_make_pte(v & ~clear);
 182 }
 183
 184 static inline pte_t pte_mkclean(pte_t pte)
 185 {
 186         return pte_clear_flags(pte, _PAGE_DIRTY);
 187 }
 188
 189 static inline pte_t pte_mkold(pte_t pte)
 190 {
 191         return pte_clear_flags(pte, _PAGE_ACCESSED);
 192 }
 193
 194 static inline pte_t pte_wrprotect(pte_t pte)
 195 {
 196         return pte_clear_flags(pte, _PAGE_RW);
 197 }
 198
 199 static inline pte_t pte_mkexec(pte_t pte)
 200 {
 201         return pte_clear_flags(pte, _PAGE_NX);
 202 }
 203
 204 static inline pte_t pte_mkdirty(pte_t pte)
 205 {
 206         return pte_set_flags(pte, _PAGE_DIRTY);
 207 }
 208
 209 static inline pte_t pte_mkyoung(pte_t pte)
 210 {
 211         return pte_set_flags(pte, _PAGE_ACCESSED);
 212 }
 213
 214 static inline pte_t pte_mkwrite(pte_t pte)
 215 {
 216         return pte_set_flags(pte, _PAGE_RW);
 217 }
 218
 219 static inline pte_t pte_mkhuge(pte_t pte)
 220 {
 221         return pte_set_flags(pte, _PAGE_PSE);
 222 }
 223
 224 static inline pte_t pte_clrhuge(pte_t pte)
 225 {
 226         return pte_clear_flags(pte, _PAGE_PSE);
 227 }
 228
 229 static inline pte_t pte_mkglobal(pte_t pte)
 230 {
 231         return pte_set_flags(pte, _PAGE_GLOBAL);
 232 }
 233
 234 static inline pte_t pte_clrglobal(pte_t pte)
 235 {
 236         return pte_clear_flags(pte, _PAGE_GLOBAL);
 237 }
 238
 239 static inline pte_t pte_mkspecial(pte_t pte)
 240 {
 241         return pte_set_flags(pte, _PAGE_SPECIAL);
 242 }
 243
 244 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
 245 {
 246         pmdval_t v = native_pmd_val(pmd);
 247
 248         return __pmd(v | set);
 249 }
 250
 251 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
 252 {
 253         pmdval_t v = native_pmd_val(pmd);
 254
 255         return __pmd(v & ~clear);
 256 }
 257
 258 static inline pmd_t pmd_mkold(pmd_t pmd)
 259 {
 260         return pmd_clear_flags(pmd, _PAGE_ACCESSED);
 261 }
 262
 263 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 264 {
 265         return pmd_clear_flags(pmd, _PAGE_RW);
 266 }
 267
 268 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 269 {
 270         return pmd_set_flags(pmd, _PAGE_DIRTY);
 271 }
 272
 273 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 274 {
 275         return pmd_set_flags(pmd, _PAGE_PSE);
 276 }
 277
 278 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 279 {
 280         return pmd_set_flags(pmd, _PAGE_ACCESSED);
 281 }
 282
 283 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 284 {
 285         return pmd_set_flags(pmd, _PAGE_RW);
 286 }
 287
 288 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 289 {
 290         return pmd_clear_flags(pmd, _PAGE_PRESENT);
 291 }
 292
 293 /*
 294  * Mask out unsupported bits in a present pgprot.  Non-present pgprots
 295  * can use those bits for other purposes, so leave them be.
 296  */
 297 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
 298 {
 299         pgprotval_t protval = pgprot_val(pgprot);
 300
 301         if (protval & _PAGE_PRESENT)
 302                 protval &= __supported_pte_mask;
 303
 304         return protval;
 305 }
 306
 307 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 308 {
 309         return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
 310                      massage_pgprot(pgprot));
 311 }
 312
 313 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 314 {
 315         return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
 316                      massage_pgprot(pgprot));
 317 }
 318
 319 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 320 {
 321         pteval_t val = pte_val(pte);
 322
 323         /*
 324          * Chop off the NX bit (if present), and add the NX portion of
 325          * the newprot (if present):
 326          */
 327         val &= _PAGE_CHG_MASK;
 328         val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
 329
 330         return __pte(val);
 331 }
 332
 333 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 334 {
 335         pmdval_t val = pmd_val(pmd);
 336
 337         val &= _HPAGE_CHG_MASK;
 338         val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
 339
 340         return __pmd(val);
 341 }
 342
 343 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
 344 #define pgprot_modify pgprot_modify
 345 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
 346 {
 347         pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
 348         pgprotval_t addbits = pgprot_val(newprot);
 349         return __pgprot(preservebits | addbits);
 350 }
 351
 352 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
 353
 354 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
 355
 356 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
 357                                          unsigned long flags,
 358                                          unsigned long new_flags)
 359 {
 360         /*
 361          * PAT type is always WB for untracked ranges, so no need to check.
 362          */
 363         if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
 364                 return 1;
 365
 366         /*
 367          * Certain new memtypes are not allowed with certain
 368          * requested memtype:
 369          * - request is uncached, return cannot be write-back
 370          * - request is write-combine, return cannot be write-back
 371          */
 372         if ((flags == _PAGE_CACHE_UC_MINUS &&
 373              new_flags == _PAGE_CACHE_WB) ||
 374             (flags == _PAGE_CACHE_WC &&
 375              new_flags == _PAGE_CACHE_WB)) {
 376                 return 0;
 377         }
 378
 379         return 1;
 380 }
 381
 382 pmd_t *populate_extra_pmd(unsigned long vaddr);
 383 pte_t *populate_extra_pte(unsigned long vaddr);
 384 #endif  /* __ASSEMBLY__ */
 385
 386 #ifdef CONFIG_X86_32
 387 # include "pgtable_32.h"
 388 #else
 389 # include "pgtable_64.h"
 390 #endif
 391
 392 #ifndef __ASSEMBLY__
 393 #include <linux/mm_types.h>
 394
 395 static inline int pte_none(pte_t pte)
 396 {
 397         return !pte.pte;
 398 }
 399
 400 #define __HAVE_ARCH_PTE_SAME
 401 static inline int pte_same(pte_t a, pte_t b)
 402 {
 403         return a.pte == b.pte;
 404 }
 405
 406 static inline int pte_present(pte_t a)
 407 {
 408         return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
 409 }
 410
 411 static inline int pte_hidden(pte_t pte)
 412 {
 413         return pte_flags(pte) & _PAGE_HIDDEN;
 414 }
 415
 416 static inline int pmd_present(pmd_t pmd)
 417 {
 418         return pmd_flags(pmd) & _PAGE_PRESENT;
 419 }
 420
 421 static inline int pmd_none(pmd_t pmd)
 422 {
 423         /* Only check low word on 32-bit platforms, since it might be
 424            out of sync with upper half. */
 425         return (unsigned long)native_pmd_val(pmd) == 0;
 426 }
 427
 428 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 429 {
 430         return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
 431 }
 432
 433 /*
 434  * Currently stuck as a macro due to indirect forward reference to
 435  * linux/mmzone.h's __section_mem_map_addr() definition:
 436  */
 437 #define pmd_page(pmd)   pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
 438
 439 /*
 440  * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
 441  *
 442  * this macro returns the index of the entry in the pmd page which would
 443  * control the given virtual address
 444  */
 445 static inline unsigned long pmd_index(unsigned long address)
 446 {
 447         return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
 448 }
 449
 450 /*
 451  * Conversion functions: convert a page and protection to a page entry,
 452  * and a page entry and page directory to the page they refer to.
 453  *
 454  * (Currently stuck as a macro because of indirect forward reference
 455  * to linux/mm.h:page_to_nid())
 456  */
 457 #define mk_pte(page, pgprot)   pfn_pte(page_to_pfn(page), (pgprot))
 458
 459 /*
 460  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 461  *
 462  * this function returns the index of the entry in the pte page which would
 463  * control the given virtual address
 464  */
 465 static inline unsigned long pte_index(unsigned long address)
 466 {
 467         return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
 468 }
 469
 470 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
 471 {
 472         return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
 473 }
 474
 475 static inline int pmd_bad(pmd_t pmd)
 476 {
 477         return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
 478 }
 479
 480 static inline unsigned long pages_to_mb(unsigned long npg)
 481 {
 482         return npg >> (20 - PAGE_SHIFT);
 483 }
 484
 485 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 486         remap_pfn_range(vma, vaddr, pfn, size, prot)
 487
 488 #if PAGETABLE_LEVELS > 2
 489 static inline int pud_none(pud_t pud)
 490 {
 491         return native_pud_val(pud) == 0;
 492 }
 493
 494 static inline int pud_present(pud_t pud)
 495 {
 496         return pud_flags(pud) & _PAGE_PRESENT;
 497 }
 498
 499 static inline unsigned long pud_page_vaddr(pud_t pud)
 500 {
 501         return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
 502 }
 503
 504 /*
 505  * Currently stuck as a macro due to indirect forward reference to
 506  * linux/mmzone.h's __section_mem_map_addr() definition:
 507  */
 508 #define pud_page(pud)           pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
 509
 510 /* Find an entry in the second-level page table.. */
 511 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
 512 {
 513         return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
 514 }
 515
 516 static inline int pud_large(pud_t pud)
 517 {
 518         return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 519                 (_PAGE_PSE | _PAGE_PRESENT);
 520 }
 521
 522 static inline int pud_bad(pud_t pud)
 523 {
 524         return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
 525 }
 526 #else
 527 static inline int pud_large(pud_t pud)
 528 {
 529         return 0;
 530 }
 531 #endif  /* PAGETABLE_LEVELS > 2 */
 532
 533 #if PAGETABLE_LEVELS > 3
 534 static inline int pgd_present(pgd_t pgd)
 535 {
 536         return pgd_flags(pgd) & _PAGE_PRESENT;
 537 }
 538
 539 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 540 {
 541         return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
 542 }
 543
 544 /*
 545  * Currently stuck as a macro due to indirect forward reference to
 546  * linux/mmzone.h's __section_mem_map_addr() definition:
 547  */
 548 #define pgd_page(pgd)           pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
 549
 550 /* to find an entry in a page-table-directory. */
 551 static inline unsigned long pud_index(unsigned long address)
 552 {
 553         return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
 554 }
 555
 556 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
 557 {
 558         return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
 559 }
 560
 561 static inline int pgd_bad(pgd_t pgd)
 562 {
 563         return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
 564 }
 565
 566 static inline int pgd_none(pgd_t pgd)
 567 {
 568         return !native_pgd_val(pgd);
 569 }
 570 #endif  /* PAGETABLE_LEVELS > 3 */
 571
 572 #endif  /* __ASSEMBLY__ */
 573
 574 /*
 575  * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
 576  *
 577  * this macro returns the index of the entry in the pgd page which would
 578  * control the given virtual address
 579  */
 580 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 581
 582 /*
 583  * pgd_offset() returns a (pgd_t *)
 584  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 585  */
 586 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
 587 /*
 588  * a shortcut which implies the use of the kernel's pgd, instead
 589  * of a process's
 590  */
 591 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
 592
 593
 594 #define KERNEL_PGD_BOUNDARY     pgd_index(PAGE_OFFSET)
 595 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
 596
 597 #ifndef __ASSEMBLY__
 598
 599 extern int direct_gbpages;
 600
 601 /* local pte updates need not use xchg for locking */
 602 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
 603 {
 604         pte_t res = *ptep;
 605
 606         /* Pure native function needs no input for mm, addr */
 607         native_pte_clear(NULL, 0, ptep);
 608         return res;
 609 }
 610
 611 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
 612 {
 613         pmd_t res = *pmdp;
 614
 615         native_pmd_clear(pmdp);
 616         return res;
 617 }
 618
 619 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
 620                                      pte_t *ptep , pte_t pte)
 621 {
 622         native_set_pte(ptep, pte);
 623 }
 624
 625 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
 626                                      pmd_t *pmdp , pmd_t pmd)
 627 {
 628         native_set_pmd(pmdp, pmd);
 629 }
 630
 631 #ifndef CONFIG_PARAVIRT
 632 /*
 633  * Rules for using pte_update - it must be called after any PTE update which
 634  * has not been done using the set_pte / clear_pte interfaces.  It is used by
 635  * shadow mode hypervisors to resynchronize the shadow page tables.  Kernel PTE
 636  * updates should either be sets, clears, or set_pte_atomic for P->P
 637  * transitions, which means this hook should only be called for user PTEs.
 638  * This hook implies a P->P protection or access change has taken place, which
 639  * requires a subsequent TLB flush.  The notification can optionally be delayed
 640  * until the TLB flush event by using the pte_update_defer form of the
 641  * interface, but care must be taken to assure that the flush happens while
 642  * still holding the same page table lock so that the shadow and primary pages
 643  * do not become out of sync on SMP.
 644  */
 645 #define pte_update(mm, addr, ptep)              do { } while (0)
 646 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
 647 #endif
 648
 649 /*
 650  * We only update the dirty/accessed state if we set
 651  * the dirty bit by hand in the kernel, since the hardware
 652  * will do the accessed bit for us, and we don't want to
 653  * race with other CPU's that might be updating the dirty
 654  * bit at the same time.
 655  */
 656 struct vm_area_struct;
 657
 658 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 659 extern int ptep_set_access_flags(struct vm_area_struct *vma,
 660                                  unsigned long address, pte_t *ptep,
 661                                  pte_t entry, int dirty);
 662
 663 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 664 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
 665                                      unsigned long addr, pte_t *ptep);
 666
 667 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 668 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
 669                                   unsigned long address, pte_t *ptep);
 670
 671 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 672 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 673                                        pte_t *ptep)
 674 {
 675         pte_t pte = native_ptep_get_and_clear(ptep);
 676         pte_update(mm, addr, ptep);
 677         return pte;
 678 }
 679
 680 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 681 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 682                                             unsigned long addr, pte_t *ptep,
 683                                             int full)
 684 {
 685         pte_t pte;
 686         if (full) {
 687                 /*
 688                  * Full address destruction in progress; paravirt does not
 689                  * care about updates and native needs no locking
 690                  */
 691                 pte = native_local_ptep_get_and_clear(ptep);
 692         } else {
 693                 pte = ptep_get_and_clear(mm, addr, ptep);
 694         }
 695         return pte;
 696 }
 697
 698 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 699 static inline void ptep_set_wrprotect(struct mm_struct *mm,
 700                                       unsigned long addr, pte_t *ptep)
 701 {
 702         clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
 703         pte_update(mm, addr, ptep);
 704 }
 705
 706 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
 707
 708 #define mk_pmd(page, pgprot)   pfn_pmd(page_to_pfn(page), (pgprot))
 709
 710 #define  __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
 711 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
 712                                  unsigned long address, pmd_t *pmdp,
 713                                  pmd_t entry, int dirty);
 714
 715 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
 716 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 717                                      unsigned long addr, pmd_t *pmdp);
 718
 719 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
 720 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
 721                                   unsigned long address, pmd_t *pmdp);
 722
 723
 724 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 725 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 726                                  unsigned long addr, pmd_t *pmdp);
 727
 728 #define __HAVE_ARCH_PMD_WRITE
 729 static inline int pmd_write(pmd_t pmd)
 730 {
 731         return pmd_flags(pmd) & _PAGE_RW;
 732 }
 733
 734 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
 735 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
 736                                        pmd_t *pmdp)
 737 {
 738         pmd_t pmd = native_pmdp_get_and_clear(pmdp);
 739         pmd_update(mm, addr, pmdp);
 740         return pmd;
 741 }
 742
 743 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
 744 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 745                                       unsigned long addr, pmd_t *pmdp)
 746 {
 747         clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
 748         pmd_update(mm, addr, pmdp);
 749 }
 750
 751 /*
 752  * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
 753  *
 754  *  dst - pointer to pgd range anwhere on a pgd page
 755  *  src - ""
 756  *  count - the number of pgds to copy.
 757  *
 758  * dst and src can be on the same page, but the range must not overlap,
 759  * and must not cross a page boundary.
 760  */
 761 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
 762 {
 763        memcpy(dst, src, count * sizeof(pgd_t));
 764 }
 765
 766
 767 #include <asm-generic/pgtable.h>
 768 #endif  /* __ASSEMBLY__ */
 769
 770 #endif /* _ASM_X86_PGTABLE_H */