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;
 150 }
 151
 152 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 153 static inline int pmd_trans_splitting(pmd_t pmd)
 154 {
 155         return pmd_val(pmd) & _PAGE_SPLITTING;
 156 }
 157
 158 static inline int pmd_trans_huge(pmd_t pmd)
 159 {
 160         return pmd_val(pmd) & _PAGE_PSE;
 161 }
 162
 163 static inline int has_transparent_hugepage(void)
 164 {
 165         return cpu_has_pse;
 166 }
 167 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 168
 169 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
 170 {
 171         pteval_t v = native_pte_val(pte);
 172
 173         return native_make_pte(v | set);
 174 }
 175
 176 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
 177 {
 178         pteval_t v = native_pte_val(pte);
 179
 180         return native_make_pte(v & ~clear);
 181 }
 182
 183 static inline pte_t pte_mkclean(pte_t pte)
 184 {
 185         return pte_clear_flags(pte, _PAGE_DIRTY);
 186 }
 187
 188 static inline pte_t pte_mkold(pte_t pte)
 189 {
 190         return pte_clear_flags(pte, _PAGE_ACCESSED);
 191 }
 192
 193 static inline pte_t pte_wrprotect(pte_t pte)
 194 {
 195         return pte_clear_flags(pte, _PAGE_RW);
 196 }
 197
 198 static inline pte_t pte_mkexec(pte_t pte)
 199 {
 200         return pte_clear_flags(pte, _PAGE_NX);
 201 }
 202
 203 static inline pte_t pte_mkdirty(pte_t pte)
 204 {
 205         return pte_set_flags(pte, _PAGE_DIRTY);
 206 }
 207
 208 static inline pte_t pte_mkyoung(pte_t pte)
 209 {
 210         return pte_set_flags(pte, _PAGE_ACCESSED);
 211 }
 212
 213 static inline pte_t pte_mkwrite(pte_t pte)
 214 {
 215         return pte_set_flags(pte, _PAGE_RW);
 216 }
 217
 218 static inline pte_t pte_mkhuge(pte_t pte)
 219 {
 220         return pte_set_flags(pte, _PAGE_PSE);
 221 }
 222
 223 static inline pte_t pte_clrhuge(pte_t pte)
 224 {
 225         return pte_clear_flags(pte, _PAGE_PSE);
 226 }
 227
 228 static inline pte_t pte_mkglobal(pte_t pte)
 229 {
 230         return pte_set_flags(pte, _PAGE_GLOBAL);
 231 }
 232
 233 static inline pte_t pte_clrglobal(pte_t pte)
 234 {
 235         return pte_clear_flags(pte, _PAGE_GLOBAL);
 236 }
 237
 238 static inline pte_t pte_mkspecial(pte_t pte)
 239 {
 240         return pte_set_flags(pte, _PAGE_SPECIAL);
 241 }
 242
 243 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
 244 {
 245         pmdval_t v = native_pmd_val(pmd);
 246
 247         return __pmd(v | set);
 248 }
 249
 250 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
 251 {
 252         pmdval_t v = native_pmd_val(pmd);
 253
 254         return __pmd(v & ~clear);
 255 }
 256
 257 static inline pmd_t pmd_mkold(pmd_t pmd)
 258 {
 259         return pmd_clear_flags(pmd, _PAGE_ACCESSED);
 260 }
 261
 262 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 263 {
 264         return pmd_clear_flags(pmd, _PAGE_RW);
 265 }
 266
 267 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 268 {
 269         return pmd_set_flags(pmd, _PAGE_DIRTY);
 270 }
 271
 272 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 273 {
 274         return pmd_set_flags(pmd, _PAGE_PSE);
 275 }
 276
 277 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 278 {
 279         return pmd_set_flags(pmd, _PAGE_ACCESSED);
 280 }
 281
 282 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 283 {
 284         return pmd_set_flags(pmd, _PAGE_RW);
 285 }
 286
 287 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 288 {
 289         return pmd_clear_flags(pmd, _PAGE_PRESENT);
 290 }
 291
 292 /*
 293  * Mask out unsupported bits in a present pgprot.  Non-present pgprots
 294  * can use those bits for other purposes, so leave them be.
 295  */
 296 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
 297 {
 298         pgprotval_t protval = pgprot_val(pgprot);
 299
 300         if (protval & _PAGE_PRESENT)
 301                 protval &= __supported_pte_mask;
 302
 303         return protval;
 304 }
 305
 306 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 307 {
 308         return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
 309                      massage_pgprot(pgprot));
 310 }
 311
 312 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 313 {
 314         return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
 315                      massage_pgprot(pgprot));
 316 }
 317
 318 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 319 {
 320         pteval_t val = pte_val(pte);
 321
 322         /*
 323          * Chop off the NX bit (if present), and add the NX portion of
 324          * the newprot (if present):
 325          */
 326         val &= _PAGE_CHG_MASK;
 327         val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
 328
 329         return __pte(val);
 330 }
 331
 332 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 333 {
 334         pmdval_t val = pmd_val(pmd);
 335
 336         val &= _HPAGE_CHG_MASK;
 337         val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
 338
 339         return __pmd(val);
 340 }
 341
 342 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
 343 #define pgprot_modify pgprot_modify
 344 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
 345 {
 346         pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
 347         pgprotval_t addbits = pgprot_val(newprot);
 348         return __pgprot(preservebits | addbits);
 349 }
 350
 351 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
 352
 353 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
 354
 355 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
 356                                          unsigned long flags,
 357                                          unsigned long new_flags)
 358 {
 359         /*
 360          * PAT type is always WB for untracked ranges, so no need to check.
 361          */
 362         if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
 363                 return 1;
 364
 365         /*
 366          * Certain new memtypes are not allowed with certain
 367          * requested memtype:
 368          * - request is uncached, return cannot be write-back
 369          * - request is write-combine, return cannot be write-back
 370          */
 371         if ((flags == _PAGE_CACHE_UC_MINUS &&
 372              new_flags == _PAGE_CACHE_WB) ||
 373             (flags == _PAGE_CACHE_WC &&
 374              new_flags == _PAGE_CACHE_WB)) {
 375                 return 0;
 376         }
 377
 378         return 1;
 379 }
 380
 381 pmd_t *populate_extra_pmd(unsigned long vaddr);
 382 pte_t *populate_extra_pte(unsigned long vaddr);
 383 #endif  /* __ASSEMBLY__ */
 384
 385 #ifdef CONFIG_X86_32
 386 # include "pgtable_32.h"
 387 #else
 388 # include "pgtable_64.h"
 389 #endif
 390
 391 #ifndef __ASSEMBLY__
 392 #include <linux/mm_types.h>
 393
 394 static inline int pte_none(pte_t pte)
 395 {
 396         return !pte.pte;
 397 }
 398
 399 #define __HAVE_ARCH_PTE_SAME
 400 static inline int pte_same(pte_t a, pte_t b)
 401 {
 402         return a.pte == b.pte;
 403 }
 404
 405 static inline int pte_present(pte_t a)
 406 {
 407         return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
 408 }
 409
 410 static inline int pte_hidden(pte_t pte)
 411 {
 412         return pte_flags(pte) & _PAGE_HIDDEN;
 413 }
 414
 415 static inline int pmd_present(pmd_t pmd)
 416 {
 417         /*
 418          * Checking for _PAGE_PSE is needed too because
 419          * split_huge_page will temporarily clear the present bit (but
 420          * the _PAGE_PSE flag will remain set at all times while the
 421          * _PAGE_PRESENT bit is clear).
 422          */
 423         return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
 424 }
 425
 426 static inline int pmd_none(pmd_t pmd)
 427 {
 428         /* Only check low word on 32-bit platforms, since it might be
 429            out of sync with upper half. */
 430         return (unsigned long)native_pmd_val(pmd) == 0;
 431 }
 432
 433 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 434 {
 435         return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
 436 }
 437
 438 /*
 439  * Currently stuck as a macro due to indirect forward reference to
 440  * linux/mmzone.h's __section_mem_map_addr() definition:
 441  */
 442 #define pmd_page(pmd)   pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
 443
 444 /*
 445  * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
 446  *
 447  * this macro returns the index of the entry in the pmd page which would
 448  * control the given virtual address
 449  */
 450 static inline unsigned long pmd_index(unsigned long address)
 451 {
 452         return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
 453 }
 454
 455 /*
 456  * Conversion functions: convert a page and protection to a page entry,
 457  * and a page entry and page directory to the page they refer to.
 458  *
 459  * (Currently stuck as a macro because of indirect forward reference
 460  * to linux/mm.h:page_to_nid())
 461  */
 462 #define mk_pte(page, pgprot)   pfn_pte(page_to_pfn(page), (pgprot))
 463
 464 /*
 465  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 466  *
 467  * this function returns the index of the entry in the pte page which would
 468  * control the given virtual address
 469  */
 470 static inline unsigned long pte_index(unsigned long address)
 471 {
 472         return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
 473 }
 474
 475 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
 476 {
 477         return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
 478 }
 479
 480 static inline int pmd_bad(pmd_t pmd)
 481 {
 482         return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
 483 }
 484
 485 static inline unsigned long pages_to_mb(unsigned long npg)
 486 {
 487         return npg >> (20 - PAGE_SHIFT);
 488 }
 489
 490 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 491         remap_pfn_range(vma, vaddr, pfn, size, prot)
 492
 493 #if PAGETABLE_LEVELS > 2
 494 static inline int pud_none(pud_t pud)
 495 {
 496         return native_pud_val(pud) == 0;
 497 }
 498
 499 static inline int pud_present(pud_t pud)
 500 {
 501         return pud_flags(pud) & _PAGE_PRESENT;
 502 }
 503
 504 static inline unsigned long pud_page_vaddr(pud_t pud)
 505 {
 506         return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
 507 }
 508
 509 /*
 510  * Currently stuck as a macro due to indirect forward reference to
 511  * linux/mmzone.h's __section_mem_map_addr() definition:
 512  */
 513 #define pud_page(pud)           pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
 514
 515 /* Find an entry in the second-level page table.. */
 516 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
 517 {
 518         return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
 519 }
 520
 521 static inline int pud_large(pud_t pud)
 522 {
 523         return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 524                 (_PAGE_PSE | _PAGE_PRESENT);
 525 }
 526
 527 static inline int pud_bad(pud_t pud)
 528 {
 529         return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
 530 }
 531 #else
 532 static inline int pud_large(pud_t pud)
 533 {
 534         return 0;
 535 }
 536 #endif  /* PAGETABLE_LEVELS > 2 */
 537
 538 #if PAGETABLE_LEVELS > 3
 539 static inline int pgd_present(pgd_t pgd)
 540 {
 541         return pgd_flags(pgd) & _PAGE_PRESENT;
 542 }
 543
 544 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 545 {
 546         return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
 547 }
 548
 549 /*
 550  * Currently stuck as a macro due to indirect forward reference to
 551  * linux/mmzone.h's __section_mem_map_addr() definition:
 552  */
 553 #define pgd_page(pgd)           pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
 554
 555 /* to find an entry in a page-table-directory. */
 556 static inline unsigned long pud_index(unsigned long address)
 557 {
 558         return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
 559 }
 560
 561 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
 562 {
 563         return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
 564 }
 565
 566 static inline int pgd_bad(pgd_t pgd)
 567 {
 568         return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
 569 }
 570
 571 static inline int pgd_none(pgd_t pgd)
 572 {
 573         return !native_pgd_val(pgd);
 574 }
 575 #endif  /* PAGETABLE_LEVELS > 3 */
 576
 577 #endif  /* __ASSEMBLY__ */
 578
 579 /*
 580  * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
 581  *
 582  * this macro returns the index of the entry in the pgd page which would
 583  * control the given virtual address
 584  */
 585 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 586
 587 /*
 588  * pgd_offset() returns a (pgd_t *)
 589  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 590  */
 591 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
 592 /*
 593  * a shortcut which implies the use of the kernel's pgd, instead
 594  * of a process's
 595  */
 596 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
 597
 598
 599 #define KERNEL_PGD_BOUNDARY     pgd_index(PAGE_OFFSET)
 600 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
 601
 602 #ifndef __ASSEMBLY__
 603
 604 extern int direct_gbpages;
 605
 606 /* local pte updates need not use xchg for locking */
 607 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
 608 {
 609         pte_t res = *ptep;
 610
 611         /* Pure native function needs no input for mm, addr */
 612         native_pte_clear(NULL, 0, ptep);
 613         return res;
 614 }
 615
 616 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
 617 {
 618         pmd_t res = *pmdp;
 619
 620         native_pmd_clear(pmdp);
 621         return res;
 622 }
 623
 624 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
 625                                      pte_t *ptep , pte_t pte)
 626 {
 627         native_set_pte(ptep, pte);
 628 }
 629
 630 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
 631                                      pmd_t *pmdp , pmd_t pmd)
 632 {
 633         native_set_pmd(pmdp, pmd);
 634 }
 635
 636 #ifndef CONFIG_PARAVIRT
 637 /*
 638  * Rules for using pte_update - it must be called after any PTE update which
 639  * has not been done using the set_pte / clear_pte interfaces.  It is used by
 640  * shadow mode hypervisors to resynchronize the shadow page tables.  Kernel PTE
 641  * updates should either be sets, clears, or set_pte_atomic for P->P
 642  * transitions, which means this hook should only be called for user PTEs.
 643  * This hook implies a P->P protection or access change has taken place, which
 644  * requires a subsequent TLB flush.  The notification can optionally be delayed
 645  * until the TLB flush event by using the pte_update_defer form of the
 646  * interface, but care must be taken to assure that the flush happens while
 647  * still holding the same page table lock so that the shadow and primary pages
 648  * do not become out of sync on SMP.
 649  */
 650 #define pte_update(mm, addr, ptep)              do { } while (0)
 651 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
 652 #endif
 653
 654 /*
 655  * We only update the dirty/accessed state if we set
 656  * the dirty bit by hand in the kernel, since the hardware
 657  * will do the accessed bit for us, and we don't want to
 658  * race with other CPU's that might be updating the dirty
 659  * bit at the same time.
 660  */
 661 struct vm_area_struct;
 662
 663 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 664 extern int ptep_set_access_flags(struct vm_area_struct *vma,
 665                                  unsigned long address, pte_t *ptep,
 666                                  pte_t entry, int dirty);
 667
 668 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 669 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
 670                                      unsigned long addr, pte_t *ptep);
 671
 672 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 673 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
 674                                   unsigned long address, pte_t *ptep);
 675
 676 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 677 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 678                                        pte_t *ptep)
 679 {
 680         pte_t pte = native_ptep_get_and_clear(ptep);
 681         pte_update(mm, addr, ptep);
 682         return pte;
 683 }
 684
 685 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 686 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 687                                             unsigned long addr, pte_t *ptep,
 688                                             int full)
 689 {
 690         pte_t pte;
 691         if (full) {
 692                 /*
 693                  * Full address destruction in progress; paravirt does not
 694                  * care about updates and native needs no locking
 695                  */
 696                 pte = native_local_ptep_get_and_clear(ptep);
 697         } else {
 698                 pte = ptep_get_and_clear(mm, addr, ptep);
 699         }
 700         return pte;
 701 }
 702
 703 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 704 static inline void ptep_set_wrprotect(struct mm_struct *mm,
 705                                       unsigned long addr, pte_t *ptep)
 706 {
 707         clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
 708         pte_update(mm, addr, ptep);
 709 }
 710
 711 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
 712
 713 #define mk_pmd(page, pgprot)   pfn_pmd(page_to_pfn(page), (pgprot))
 714
 715 #define  __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
 716 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
 717                                  unsigned long address, pmd_t *pmdp,
 718                                  pmd_t entry, int dirty);
 719
 720 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
 721 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 722                                      unsigned long addr, pmd_t *pmdp);
 723
 724 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
 725 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
 726                                   unsigned long address, pmd_t *pmdp);
 727
 728
 729 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 730 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 731                                  unsigned long addr, pmd_t *pmdp);
 732
 733 #define __HAVE_ARCH_PMD_WRITE
 734 static inline int pmd_write(pmd_t pmd)
 735 {
 736         return pmd_flags(pmd) & _PAGE_RW;
 737 }
 738
 739 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
 740 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
 741                                        pmd_t *pmdp)
 742 {
 743         pmd_t pmd = native_pmdp_get_and_clear(pmdp);
 744         pmd_update(mm, addr, pmdp);
 745         return pmd;
 746 }
 747
 748 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
 749 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 750                                       unsigned long addr, pmd_t *pmdp)
 751 {
 752         clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
 753         pmd_update(mm, addr, pmdp);
 754 }
 755
 756 /*
 757  * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
 758  *
 759  *  dst - pointer to pgd range anwhere on a pgd page
 760  *  src - ""
 761  *  count - the number of pgds to copy.
 762  *
 763  * dst and src can be on the same page, but the range must not overlap,
 764  * and must not cross a page boundary.
 765  */
 766 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
 767 {
 768        memcpy(dst, src, count * sizeof(pgd_t));
 769 }
 770
 771
 772 #include <asm-generic/pgtable.h>
 773 #endif  /* __ASSEMBLY__ */
 774
 775 #endif /* _ASM_X86_PGTABLE_H */