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 static inline unsigned long pud_pfn(pud_t pud)
 146 {
 147         return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;
 148 }
 149
 150 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 151
 152 static inline int pmd_large(pmd_t pte)
 153 {
 154         return pmd_flags(pte) & _PAGE_PSE;
 155 }
 156
 157 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 158 static inline int pmd_trans_splitting(pmd_t pmd)
 159 {
 160         return pmd_val(pmd) & _PAGE_SPLITTING;
 161 }
 162
 163 static inline int pmd_trans_huge(pmd_t pmd)
 164 {
 165         return pmd_val(pmd) & _PAGE_PSE;
 166 }
 167
 168 static inline int has_transparent_hugepage(void)
 169 {
 170         return cpu_has_pse;
 171 }
 172 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 173
 174 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
 175 {
 176         pteval_t v = native_pte_val(pte);
 177
 178         return native_make_pte(v | set);
 179 }
 180
 181 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
 182 {
 183         pteval_t v = native_pte_val(pte);
 184
 185         return native_make_pte(v & ~clear);
 186 }
 187
 188 static inline pte_t pte_mkclean(pte_t pte)
 189 {
 190         return pte_clear_flags(pte, _PAGE_DIRTY);
 191 }
 192
 193 static inline pte_t pte_mkold(pte_t pte)
 194 {
 195         return pte_clear_flags(pte, _PAGE_ACCESSED);
 196 }
 197
 198 static inline pte_t pte_wrprotect(pte_t pte)
 199 {
 200         return pte_clear_flags(pte, _PAGE_RW);
 201 }
 202
 203 static inline pte_t pte_mkexec(pte_t pte)
 204 {
 205         return pte_clear_flags(pte, _PAGE_NX);
 206 }
 207
 208 static inline pte_t pte_mkdirty(pte_t pte)
 209 {
 210         return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
 211 }
 212
 213 static inline pte_t pte_mkyoung(pte_t pte)
 214 {
 215         return pte_set_flags(pte, _PAGE_ACCESSED);
 216 }
 217
 218 static inline pte_t pte_mkwrite(pte_t pte)
 219 {
 220         return pte_set_flags(pte, _PAGE_RW);
 221 }
 222
 223 static inline pte_t pte_mkhuge(pte_t pte)
 224 {
 225         return pte_set_flags(pte, _PAGE_PSE);
 226 }
 227
 228 static inline pte_t pte_clrhuge(pte_t pte)
 229 {
 230         return pte_clear_flags(pte, _PAGE_PSE);
 231 }
 232
 233 static inline pte_t pte_mkglobal(pte_t pte)
 234 {
 235         return pte_set_flags(pte, _PAGE_GLOBAL);
 236 }
 237
 238 static inline pte_t pte_clrglobal(pte_t pte)
 239 {
 240         return pte_clear_flags(pte, _PAGE_GLOBAL);
 241 }
 242
 243 static inline pte_t pte_mkspecial(pte_t pte)
 244 {
 245         return pte_set_flags(pte, _PAGE_SPECIAL);
 246 }
 247
 248 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
 249 {
 250         pmdval_t v = native_pmd_val(pmd);
 251
 252         return __pmd(v | set);
 253 }
 254
 255 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
 256 {
 257         pmdval_t v = native_pmd_val(pmd);
 258
 259         return __pmd(v & ~clear);
 260 }
 261
 262 static inline pmd_t pmd_mkold(pmd_t pmd)
 263 {
 264         return pmd_clear_flags(pmd, _PAGE_ACCESSED);
 265 }
 266
 267 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 268 {
 269         return pmd_clear_flags(pmd, _PAGE_RW);
 270 }
 271
 272 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 273 {
 274         return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
 275 }
 276
 277 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 278 {
 279         return pmd_set_flags(pmd, _PAGE_PSE);
 280 }
 281
 282 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 283 {
 284         return pmd_set_flags(pmd, _PAGE_ACCESSED);
 285 }
 286
 287 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 288 {
 289         return pmd_set_flags(pmd, _PAGE_RW);
 290 }
 291
 292 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 293 {
 294         return pmd_clear_flags(pmd, _PAGE_PRESENT);
 295 }
 296
 297 static inline int pte_soft_dirty(pte_t pte)
 298 {
 299         return pte_flags(pte) & _PAGE_SOFT_DIRTY;
 300 }
 301
 302 static inline int pmd_soft_dirty(pmd_t pmd)
 303 {
 304         return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
 305 }
 306
 307 static inline pte_t pte_mksoft_dirty(pte_t pte)
 308 {
 309         return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
 310 }
 311
 312 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
 313 {
 314         return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
 315 }
 316
 317 /*
 318  * Mask out unsupported bits in a present pgprot.  Non-present pgprots
 319  * can use those bits for other purposes, so leave them be.
 320  */
 321 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
 322 {
 323         pgprotval_t protval = pgprot_val(pgprot);
 324
 325         if (protval & _PAGE_PRESENT)
 326                 protval &= __supported_pte_mask;
 327
 328         return protval;
 329 }
 330
 331 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 332 {
 333         return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
 334                      massage_pgprot(pgprot));
 335 }
 336
 337 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 338 {
 339         return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
 340                      massage_pgprot(pgprot));
 341 }
 342
 343 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 344 {
 345         pteval_t val = pte_val(pte);
 346
 347         /*
 348          * Chop off the NX bit (if present), and add the NX portion of
 349          * the newprot (if present):
 350          */
 351         val &= _PAGE_CHG_MASK;
 352         val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
 353
 354         return __pte(val);
 355 }
 356
 357 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 358 {
 359         pmdval_t val = pmd_val(pmd);
 360
 361         val &= _HPAGE_CHG_MASK;
 362         val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
 363
 364         return __pmd(val);
 365 }
 366
 367 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
 368 #define pgprot_modify pgprot_modify
 369 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
 370 {
 371         pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
 372         pgprotval_t addbits = pgprot_val(newprot);
 373         return __pgprot(preservebits | addbits);
 374 }
 375
 376 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
 377
 378 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
 379
 380 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
 381                                          unsigned long flags,
 382                                          unsigned long new_flags)
 383 {
 384         /*
 385          * PAT type is always WB for untracked ranges, so no need to check.
 386          */
 387         if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
 388                 return 1;
 389
 390         /*
 391          * Certain new memtypes are not allowed with certain
 392          * requested memtype:
 393          * - request is uncached, return cannot be write-back
 394          * - request is write-combine, return cannot be write-back
 395          */
 396         if ((flags == _PAGE_CACHE_UC_MINUS &&
 397              new_flags == _PAGE_CACHE_WB) ||
 398             (flags == _PAGE_CACHE_WC &&
 399              new_flags == _PAGE_CACHE_WB)) {
 400                 return 0;
 401         }
 402
 403         return 1;
 404 }
 405
 406 pmd_t *populate_extra_pmd(unsigned long vaddr);
 407 pte_t *populate_extra_pte(unsigned long vaddr);
 408 #endif  /* __ASSEMBLY__ */
 409
 410 #ifdef CONFIG_X86_32
 411 # include <asm/pgtable_32.h>
 412 #else
 413 # include <asm/pgtable_64.h>
 414 #endif
 415
 416 #ifndef __ASSEMBLY__
 417 #include <linux/mm_types.h>
 418 #include <linux/log2.h>
 419
 420 static inline int pte_none(pte_t pte)
 421 {
 422         return !pte.pte;
 423 }
 424
 425 #define __HAVE_ARCH_PTE_SAME
 426 static inline int pte_same(pte_t a, pte_t b)
 427 {
 428         return a.pte == b.pte;
 429 }
 430
 431 static inline int pte_present(pte_t a)
 432 {
 433         return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE |
 434                                _PAGE_NUMA);
 435 }
 436
 437 #define pte_accessible pte_accessible
 438 static inline int pte_accessible(pte_t a)
 439 {
 440         return pte_flags(a) & _PAGE_PRESENT;
 441 }
 442
 443 static inline int pte_hidden(pte_t pte)
 444 {
 445         return pte_flags(pte) & _PAGE_HIDDEN;
 446 }
 447
 448 static inline int pmd_present(pmd_t pmd)
 449 {
 450         /*
 451          * Checking for _PAGE_PSE is needed too because
 452          * split_huge_page will temporarily clear the present bit (but
 453          * the _PAGE_PSE flag will remain set at all times while the
 454          * _PAGE_PRESENT bit is clear).
 455          */
 456         return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE |
 457                                  _PAGE_NUMA);
 458 }
 459
 460 static inline int pmd_none(pmd_t pmd)
 461 {
 462         /* Only check low word on 32-bit platforms, since it might be
 463            out of sync with upper half. */
 464         return (unsigned long)native_pmd_val(pmd) == 0;
 465 }
 466
 467 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 468 {
 469         return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
 470 }
 471
 472 /*
 473  * Currently stuck as a macro due to indirect forward reference to
 474  * linux/mmzone.h's __section_mem_map_addr() definition:
 475  */
 476 #define pmd_page(pmd)   pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
 477
 478 /*
 479  * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
 480  *
 481  * this macro returns the index of the entry in the pmd page which would
 482  * control the given virtual address
 483  */
 484 static inline unsigned long pmd_index(unsigned long address)
 485 {
 486         return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
 487 }
 488
 489 /*
 490  * Conversion functions: convert a page and protection to a page entry,
 491  * and a page entry and page directory to the page they refer to.
 492  *
 493  * (Currently stuck as a macro because of indirect forward reference
 494  * to linux/mm.h:page_to_nid())
 495  */
 496 #define mk_pte(page, pgprot)   pfn_pte(page_to_pfn(page), (pgprot))
 497
 498 /*
 499  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 500  *
 501  * this function returns the index of the entry in the pte page which would
 502  * control the given virtual address
 503  */
 504 static inline unsigned long pte_index(unsigned long address)
 505 {
 506         return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
 507 }
 508
 509 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
 510 {
 511         return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
 512 }
 513
 514 static inline int pmd_bad(pmd_t pmd)
 515 {
 516 #ifdef CONFIG_NUMA_BALANCING
 517         /* pmd_numa check */
 518         if ((pmd_flags(pmd) & (_PAGE_NUMA|_PAGE_PRESENT)) == _PAGE_NUMA)
 519                 return 0;
 520 #endif
 521         return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
 522 }
 523
 524 static inline unsigned long pages_to_mb(unsigned long npg)
 525 {
 526         return npg >> (20 - PAGE_SHIFT);
 527 }
 528
 529 #if PAGETABLE_LEVELS > 2
 530 static inline int pud_none(pud_t pud)
 531 {
 532         return native_pud_val(pud) == 0;
 533 }
 534
 535 static inline int pud_present(pud_t pud)
 536 {
 537         return pud_flags(pud) & _PAGE_PRESENT;
 538 }
 539
 540 static inline unsigned long pud_page_vaddr(pud_t pud)
 541 {
 542         return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
 543 }
 544
 545 /*
 546  * Currently stuck as a macro due to indirect forward reference to
 547  * linux/mmzone.h's __section_mem_map_addr() definition:
 548  */
 549 #define pud_page(pud)           pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
 550
 551 /* Find an entry in the second-level page table.. */
 552 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
 553 {
 554         return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
 555 }
 556
 557 static inline int pud_large(pud_t pud)
 558 {
 559         return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 560                 (_PAGE_PSE | _PAGE_PRESENT);
 561 }
 562
 563 static inline int pud_bad(pud_t pud)
 564 {
 565         return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
 566 }
 567 #else
 568 static inline int pud_large(pud_t pud)
 569 {
 570         return 0;
 571 }
 572 #endif  /* PAGETABLE_LEVELS > 2 */
 573
 574 #if PAGETABLE_LEVELS > 3
 575 static inline int pgd_present(pgd_t pgd)
 576 {
 577         return pgd_flags(pgd) & _PAGE_PRESENT;
 578 }
 579
 580 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 581 {
 582         return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
 583 }
 584
 585 /*
 586  * Currently stuck as a macro due to indirect forward reference to
 587  * linux/mmzone.h's __section_mem_map_addr() definition:
 588  */
 589 #define pgd_page(pgd)           pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
 590
 591 /* to find an entry in a page-table-directory. */
 592 static inline unsigned long pud_index(unsigned long address)
 593 {
 594         return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
 595 }
 596
 597 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
 598 {
 599         return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
 600 }
 601
 602 static inline int pgd_bad(pgd_t pgd)
 603 {
 604         return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
 605 }
 606
 607 static inline int pgd_none(pgd_t pgd)
 608 {
 609         return !native_pgd_val(pgd);
 610 }
 611 #endif  /* PAGETABLE_LEVELS > 3 */
 612
 613 #endif  /* __ASSEMBLY__ */
 614
 615 /*
 616  * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
 617  *
 618  * this macro returns the index of the entry in the pgd page which would
 619  * control the given virtual address
 620  */
 621 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 622
 623 /*
 624  * pgd_offset() returns a (pgd_t *)
 625  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 626  */
 627 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
 628 /*
 629  * a shortcut which implies the use of the kernel's pgd, instead
 630  * of a process's
 631  */
 632 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
 633
 634
 635 #define KERNEL_PGD_BOUNDARY     pgd_index(PAGE_OFFSET)
 636 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
 637
 638 #ifndef __ASSEMBLY__
 639
 640 extern int direct_gbpages;
 641 void init_mem_mapping(void);
 642 void early_alloc_pgt_buf(void);
 643
 644 /* local pte updates need not use xchg for locking */
 645 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
 646 {
 647         pte_t res = *ptep;
 648
 649         /* Pure native function needs no input for mm, addr */
 650         native_pte_clear(NULL, 0, ptep);
 651         return res;
 652 }
 653
 654 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
 655 {
 656         pmd_t res = *pmdp;
 657
 658         native_pmd_clear(pmdp);
 659         return res;
 660 }
 661
 662 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
 663                                      pte_t *ptep , pte_t pte)
 664 {
 665         native_set_pte(ptep, pte);
 666 }
 667
 668 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
 669                                      pmd_t *pmdp , pmd_t pmd)
 670 {
 671         native_set_pmd(pmdp, pmd);
 672 }
 673
 674 #ifndef CONFIG_PARAVIRT
 675 /*
 676  * Rules for using pte_update - it must be called after any PTE update which
 677  * has not been done using the set_pte / clear_pte interfaces.  It is used by
 678  * shadow mode hypervisors to resynchronize the shadow page tables.  Kernel PTE
 679  * updates should either be sets, clears, or set_pte_atomic for P->P
 680  * transitions, which means this hook should only be called for user PTEs.
 681  * This hook implies a P->P protection or access change has taken place, which
 682  * requires a subsequent TLB flush.  The notification can optionally be delayed
 683  * until the TLB flush event by using the pte_update_defer form of the
 684  * interface, but care must be taken to assure that the flush happens while
 685  * still holding the same page table lock so that the shadow and primary pages
 686  * do not become out of sync on SMP.
 687  */
 688 #define pte_update(mm, addr, ptep)              do { } while (0)
 689 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
 690 #endif
 691
 692 /*
 693  * We only update the dirty/accessed state if we set
 694  * the dirty bit by hand in the kernel, since the hardware
 695  * will do the accessed bit for us, and we don't want to
 696  * race with other CPU's that might be updating the dirty
 697  * bit at the same time.
 698  */
 699 struct vm_area_struct;
 700
 701 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 702 extern int ptep_set_access_flags(struct vm_area_struct *vma,
 703                                  unsigned long address, pte_t *ptep,
 704                                  pte_t entry, int dirty);
 705
 706 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 707 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
 708                                      unsigned long addr, pte_t *ptep);
 709
 710 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 711 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
 712                                   unsigned long address, pte_t *ptep);
 713
 714 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 715 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 716                                        pte_t *ptep)
 717 {
 718         pte_t pte = native_ptep_get_and_clear(ptep);
 719         pte_update(mm, addr, ptep);
 720         return pte;
 721 }
 722
 723 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 724 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 725                                             unsigned long addr, pte_t *ptep,
 726                                             int full)
 727 {
 728         pte_t pte;
 729         if (full) {
 730                 /*
 731                  * Full address destruction in progress; paravirt does not
 732                  * care about updates and native needs no locking
 733                  */
 734                 pte = native_local_ptep_get_and_clear(ptep);
 735         } else {
 736                 pte = ptep_get_and_clear(mm, addr, ptep);
 737         }
 738         return pte;
 739 }
 740
 741 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 742 static inline void ptep_set_wrprotect(struct mm_struct *mm,
 743                                       unsigned long addr, pte_t *ptep)
 744 {
 745         clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
 746         pte_update(mm, addr, ptep);
 747 }
 748
 749 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
 750
 751 #define mk_pmd(page, pgprot)   pfn_pmd(page_to_pfn(page), (pgprot))
 752
 753 #define  __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
 754 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
 755                                  unsigned long address, pmd_t *pmdp,
 756                                  pmd_t entry, int dirty);
 757
 758 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
 759 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 760                                      unsigned long addr, pmd_t *pmdp);
 761
 762 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
 763 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
 764                                   unsigned long address, pmd_t *pmdp);
 765
 766
 767 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 768 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 769                                  unsigned long addr, pmd_t *pmdp);
 770
 771 #define __HAVE_ARCH_PMD_WRITE
 772 static inline int pmd_write(pmd_t pmd)
 773 {
 774         return pmd_flags(pmd) & _PAGE_RW;
 775 }
 776
 777 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
 778 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
 779                                        pmd_t *pmdp)
 780 {
 781         pmd_t pmd = native_pmdp_get_and_clear(pmdp);
 782         pmd_update(mm, addr, pmdp);
 783         return pmd;
 784 }
 785
 786 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
 787 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 788                                       unsigned long addr, pmd_t *pmdp)
 789 {
 790         clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
 791         pmd_update(mm, addr, pmdp);
 792 }
 793
 794 /*
 795  * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
 796  *
 797  *  dst - pointer to pgd range anwhere on a pgd page
 798  *  src - ""
 799  *  count - the number of pgds to copy.
 800  *
 801  * dst and src can be on the same page, but the range must not overlap,
 802  * and must not cross a page boundary.
 803  */
 804 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
 805 {
 806        memcpy(dst, src, count * sizeof(pgd_t));
 807 }
 808
 809 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
 810 static inline int page_level_shift(enum pg_level level)
 811 {
 812         return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
 813 }
 814 static inline unsigned long page_level_size(enum pg_level level)
 815 {
 816         return 1UL << page_level_shift(level);
 817 }
 818 static inline unsigned long page_level_mask(enum pg_level level)
 819 {
 820         return ~(page_level_size(level) - 1);
 821 }
 822
 823 /*
 824  * The x86 doesn't have any external MMU info: the kernel page
 825  * tables contain all the necessary information.
 826  */
 827 static inline void update_mmu_cache(struct vm_area_struct *vma,
 828                 unsigned long addr, pte_t *ptep)
 829 {
 830 }
 831 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 832                 unsigned long addr, pmd_t *pmd)
 833 {
 834 }
 835
 836 #include <asm-generic/pgtable.h>
 837 #endif  /* __ASSEMBLY__ */
 838
 839 #endif /* _ASM_X86_PGTABLE_H */