arch/x86/include/asm/pgtable.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_PGTABLE_H
   3 #define _ASM_X86_PGTABLE_H
   4
   5 #include <linux/mem_encrypt.h>
   6 #include <asm/page.h>
   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) |                                 \
  15                      cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS)))     \
  16          : (prot))
  17
  18 /*
  19  * Macros to add or remove encryption attribute
  20  */
  21 #define pgprot_encrypted(prot)  __pgprot(__sme_set(pgprot_val(prot)))
  22 #define pgprot_decrypted(prot)  __pgprot(__sme_clr(pgprot_val(prot)))
  23
  24 #ifndef __ASSEMBLY__
  25 #include <asm/x86_init.h>
  26
  27 extern pgd_t early_top_pgt[PTRS_PER_PGD];
  28 int __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
  29
  30 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
  31 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user);
  32 void ptdump_walk_pgd_level_checkwx(void);
  33
  34 #ifdef CONFIG_DEBUG_WX
  35 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
  36 #else
  37 #define debug_checkwx() do { } while (0)
  38 #endif
  39
  40 /*
  41  * ZERO_PAGE is a global shared page that is always zero: used
  42  * for zero-mapped memory areas etc..
  43  */
  44 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
  45         __visible;
  46 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  47
  48 extern spinlock_t pgd_lock;
  49 extern struct list_head pgd_list;
  50
  51 extern struct mm_struct *pgd_page_get_mm(struct page *page);
  52
  53 extern pmdval_t early_pmd_flags;
  54
  55 #ifdef CONFIG_PARAVIRT
  56 #include <asm/paravirt.h>
  57 #else  /* !CONFIG_PARAVIRT */
  58 #define set_pte(ptep, pte)              native_set_pte(ptep, pte)
  59 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
  60
  61 #define set_pte_atomic(ptep, pte)                                       \
  62         native_set_pte_atomic(ptep, pte)
  63
  64 #define set_pmd(pmdp, pmd)              native_set_pmd(pmdp, pmd)
  65
  66 #ifndef __PAGETABLE_P4D_FOLDED
  67 #define set_pgd(pgdp, pgd)              native_set_pgd(pgdp, pgd)
  68 #define pgd_clear(pgd)                  native_pgd_clear(pgd)
  69 #endif
  70
  71 #ifndef set_p4d
  72 # define set_p4d(p4dp, p4d)             native_set_p4d(p4dp, p4d)
  73 #endif
  74
  75 #ifndef __PAGETABLE_PUD_FOLDED
  76 #define p4d_clear(p4d)                  native_p4d_clear(p4d)
  77 #endif
  78
  79 #ifndef set_pud
  80 # define set_pud(pudp, pud)             native_set_pud(pudp, pud)
  81 #endif
  82
  83 #ifndef __PAGETABLE_PUD_FOLDED
  84 #define pud_clear(pud)                  native_pud_clear(pud)
  85 #endif
  86
  87 #define pte_clear(mm, addr, ptep)       native_pte_clear(mm, addr, ptep)
  88 #define pmd_clear(pmd)                  native_pmd_clear(pmd)
  89
  90 #define pgd_val(x)      native_pgd_val(x)
  91 #define __pgd(x)        native_make_pgd(x)
  92
  93 #ifndef __PAGETABLE_P4D_FOLDED
  94 #define p4d_val(x)      native_p4d_val(x)
  95 #define __p4d(x)        native_make_p4d(x)
  96 #endif
  97
  98 #ifndef __PAGETABLE_PUD_FOLDED
  99 #define pud_val(x)      native_pud_val(x)
 100 #define __pud(x)        native_make_pud(x)
 101 #endif
 102
 103 #ifndef __PAGETABLE_PMD_FOLDED
 104 #define pmd_val(x)      native_pmd_val(x)
 105 #define __pmd(x)        native_make_pmd(x)
 106 #endif
 107
 108 #define pte_val(x)      native_pte_val(x)
 109 #define __pte(x)        native_make_pte(x)
 110
 111 #define arch_end_context_switch(prev)   do {} while(0)
 112
 113 #endif  /* CONFIG_PARAVIRT */
 114
 115 /*
 116  * The following only work if pte_present() is true.
 117  * Undefined behaviour if not..
 118  */
 119 static inline int pte_dirty(pte_t pte)
 120 {
 121         return pte_flags(pte) & _PAGE_DIRTY;
 122 }
 123
 124
 125 static inline u32 read_pkru(void)
 126 {
 127         if (boot_cpu_has(X86_FEATURE_OSPKE))
 128                 return __read_pkru();
 129         return 0;
 130 }
 131
 132 static inline void write_pkru(u32 pkru)
 133 {
 134         if (boot_cpu_has(X86_FEATURE_OSPKE))
 135                 __write_pkru(pkru);
 136 }
 137
 138 static inline int pte_young(pte_t pte)
 139 {
 140         return pte_flags(pte) & _PAGE_ACCESSED;
 141 }
 142
 143 static inline int pmd_dirty(pmd_t pmd)
 144 {
 145         return pmd_flags(pmd) & _PAGE_DIRTY;
 146 }
 147
 148 static inline int pmd_young(pmd_t pmd)
 149 {
 150         return pmd_flags(pmd) & _PAGE_ACCESSED;
 151 }
 152
 153 static inline int pud_dirty(pud_t pud)
 154 {
 155         return pud_flags(pud) & _PAGE_DIRTY;
 156 }
 157
 158 static inline int pud_young(pud_t pud)
 159 {
 160         return pud_flags(pud) & _PAGE_ACCESSED;
 161 }
 162
 163 static inline int pte_write(pte_t pte)
 164 {
 165         return pte_flags(pte) & _PAGE_RW;
 166 }
 167
 168 static inline int pte_huge(pte_t pte)
 169 {
 170         return pte_flags(pte) & _PAGE_PSE;
 171 }
 172
 173 static inline int pte_global(pte_t pte)
 174 {
 175         return pte_flags(pte) & _PAGE_GLOBAL;
 176 }
 177
 178 static inline int pte_exec(pte_t pte)
 179 {
 180         return !(pte_flags(pte) & _PAGE_NX);
 181 }
 182
 183 static inline int pte_special(pte_t pte)
 184 {
 185         return pte_flags(pte) & _PAGE_SPECIAL;
 186 }
 187
 188 static inline unsigned long pte_pfn(pte_t pte)
 189 {
 190         return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
 191 }
 192
 193 static inline unsigned long pmd_pfn(pmd_t pmd)
 194 {
 195         return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
 196 }
 197
 198 static inline unsigned long pud_pfn(pud_t pud)
 199 {
 200         return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
 201 }
 202
 203 static inline unsigned long p4d_pfn(p4d_t p4d)
 204 {
 205         return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
 206 }
 207
 208 static inline unsigned long pgd_pfn(pgd_t pgd)
 209 {
 210         return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
 211 }
 212
 213 static inline int p4d_large(p4d_t p4d)
 214 {
 215         /* No 512 GiB pages yet */
 216         return 0;
 217 }
 218
 219 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 220
 221 static inline int pmd_large(pmd_t pte)
 222 {
 223         return pmd_flags(pte) & _PAGE_PSE;
 224 }
 225
 226 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 227 static inline int pmd_trans_huge(pmd_t pmd)
 228 {
 229         return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
 230 }
 231
 232 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
 233 static inline int pud_trans_huge(pud_t pud)
 234 {
 235         return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
 236 }
 237 #endif
 238
 239 #define has_transparent_hugepage has_transparent_hugepage
 240 static inline int has_transparent_hugepage(void)
 241 {
 242         return boot_cpu_has(X86_FEATURE_PSE);
 243 }
 244
 245 #ifdef __HAVE_ARCH_PTE_DEVMAP
 246 static inline int pmd_devmap(pmd_t pmd)
 247 {
 248         return !!(pmd_val(pmd) & _PAGE_DEVMAP);
 249 }
 250
 251 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
 252 static inline int pud_devmap(pud_t pud)
 253 {
 254         return !!(pud_val(pud) & _PAGE_DEVMAP);
 255 }
 256 #else
 257 static inline int pud_devmap(pud_t pud)
 258 {
 259         return 0;
 260 }
 261 #endif
 262
 263 static inline int pgd_devmap(pgd_t pgd)
 264 {
 265         return 0;
 266 }
 267 #endif
 268 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 269
 270 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
 271 {
 272         pteval_t v = native_pte_val(pte);
 273
 274         return native_make_pte(v | set);
 275 }
 276
 277 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
 278 {
 279         pteval_t v = native_pte_val(pte);
 280
 281         return native_make_pte(v & ~clear);
 282 }
 283
 284 static inline pte_t pte_mkclean(pte_t pte)
 285 {
 286         return pte_clear_flags(pte, _PAGE_DIRTY);
 287 }
 288
 289 static inline pte_t pte_mkold(pte_t pte)
 290 {
 291         return pte_clear_flags(pte, _PAGE_ACCESSED);
 292 }
 293
 294 static inline pte_t pte_wrprotect(pte_t pte)
 295 {
 296         return pte_clear_flags(pte, _PAGE_RW);
 297 }
 298
 299 static inline pte_t pte_mkexec(pte_t pte)
 300 {
 301         return pte_clear_flags(pte, _PAGE_NX);
 302 }
 303
 304 static inline pte_t pte_mkdirty(pte_t pte)
 305 {
 306         return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
 307 }
 308
 309 static inline pte_t pte_mkyoung(pte_t pte)
 310 {
 311         return pte_set_flags(pte, _PAGE_ACCESSED);
 312 }
 313
 314 static inline pte_t pte_mkwrite(pte_t pte)
 315 {
 316         return pte_set_flags(pte, _PAGE_RW);
 317 }
 318
 319 static inline pte_t pte_mkhuge(pte_t pte)
 320 {
 321         return pte_set_flags(pte, _PAGE_PSE);
 322 }
 323
 324 static inline pte_t pte_clrhuge(pte_t pte)
 325 {
 326         return pte_clear_flags(pte, _PAGE_PSE);
 327 }
 328
 329 static inline pte_t pte_mkglobal(pte_t pte)
 330 {
 331         return pte_set_flags(pte, _PAGE_GLOBAL);
 332 }
 333
 334 static inline pte_t pte_clrglobal(pte_t pte)
 335 {
 336         return pte_clear_flags(pte, _PAGE_GLOBAL);
 337 }
 338
 339 static inline pte_t pte_mkspecial(pte_t pte)
 340 {
 341         return pte_set_flags(pte, _PAGE_SPECIAL);
 342 }
 343
 344 static inline pte_t pte_mkdevmap(pte_t pte)
 345 {
 346         return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
 347 }
 348
 349 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
 350 {
 351         pmdval_t v = native_pmd_val(pmd);
 352
 353         return native_make_pmd(v | set);
 354 }
 355
 356 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
 357 {
 358         pmdval_t v = native_pmd_val(pmd);
 359
 360         return native_make_pmd(v & ~clear);
 361 }
 362
 363 static inline pmd_t pmd_mkold(pmd_t pmd)
 364 {
 365         return pmd_clear_flags(pmd, _PAGE_ACCESSED);
 366 }
 367
 368 static inline pmd_t pmd_mkclean(pmd_t pmd)
 369 {
 370         return pmd_clear_flags(pmd, _PAGE_DIRTY);
 371 }
 372
 373 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 374 {
 375         return pmd_clear_flags(pmd, _PAGE_RW);
 376 }
 377
 378 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 379 {
 380         return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
 381 }
 382
 383 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
 384 {
 385         return pmd_set_flags(pmd, _PAGE_DEVMAP);
 386 }
 387
 388 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 389 {
 390         return pmd_set_flags(pmd, _PAGE_PSE);
 391 }
 392
 393 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 394 {
 395         return pmd_set_flags(pmd, _PAGE_ACCESSED);
 396 }
 397
 398 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 399 {
 400         return pmd_set_flags(pmd, _PAGE_RW);
 401 }
 402
 403 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 404 {
 405         return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
 406 }
 407
 408 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
 409 {
 410         pudval_t v = native_pud_val(pud);
 411
 412         return native_make_pud(v | set);
 413 }
 414
 415 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
 416 {
 417         pudval_t v = native_pud_val(pud);
 418
 419         return native_make_pud(v & ~clear);
 420 }
 421
 422 static inline pud_t pud_mkold(pud_t pud)
 423 {
 424         return pud_clear_flags(pud, _PAGE_ACCESSED);
 425 }
 426
 427 static inline pud_t pud_mkclean(pud_t pud)
 428 {
 429         return pud_clear_flags(pud, _PAGE_DIRTY);
 430 }
 431
 432 static inline pud_t pud_wrprotect(pud_t pud)
 433 {
 434         return pud_clear_flags(pud, _PAGE_RW);
 435 }
 436
 437 static inline pud_t pud_mkdirty(pud_t pud)
 438 {
 439         return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
 440 }
 441
 442 static inline pud_t pud_mkdevmap(pud_t pud)
 443 {
 444         return pud_set_flags(pud, _PAGE_DEVMAP);
 445 }
 446
 447 static inline pud_t pud_mkhuge(pud_t pud)
 448 {
 449         return pud_set_flags(pud, _PAGE_PSE);
 450 }
 451
 452 static inline pud_t pud_mkyoung(pud_t pud)
 453 {
 454         return pud_set_flags(pud, _PAGE_ACCESSED);
 455 }
 456
 457 static inline pud_t pud_mkwrite(pud_t pud)
 458 {
 459         return pud_set_flags(pud, _PAGE_RW);
 460 }
 461
 462 static inline pud_t pud_mknotpresent(pud_t pud)
 463 {
 464         return pud_clear_flags(pud, _PAGE_PRESENT | _PAGE_PROTNONE);
 465 }
 466
 467 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 468 static inline int pte_soft_dirty(pte_t pte)
 469 {
 470         return pte_flags(pte) & _PAGE_SOFT_DIRTY;
 471 }
 472
 473 static inline int pmd_soft_dirty(pmd_t pmd)
 474 {
 475         return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
 476 }
 477
 478 static inline int pud_soft_dirty(pud_t pud)
 479 {
 480         return pud_flags(pud) & _PAGE_SOFT_DIRTY;
 481 }
 482
 483 static inline pte_t pte_mksoft_dirty(pte_t pte)
 484 {
 485         return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
 486 }
 487
 488 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
 489 {
 490         return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
 491 }
 492
 493 static inline pud_t pud_mksoft_dirty(pud_t pud)
 494 {
 495         return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
 496 }
 497
 498 static inline pte_t pte_clear_soft_dirty(pte_t pte)
 499 {
 500         return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
 501 }
 502
 503 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
 504 {
 505         return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
 506 }
 507
 508 static inline pud_t pud_clear_soft_dirty(pud_t pud)
 509 {
 510         return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
 511 }
 512
 513 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
 514
 515 /*
 516  * Mask out unsupported bits in a present pgprot.  Non-present pgprots
 517  * can use those bits for other purposes, so leave them be.
 518  */
 519 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
 520 {
 521         pgprotval_t protval = pgprot_val(pgprot);
 522
 523         if (protval & _PAGE_PRESENT)
 524                 protval &= __supported_pte_mask;
 525
 526         return protval;
 527 }
 528
 529 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 530 {
 531         return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
 532                      massage_pgprot(pgprot));
 533 }
 534
 535 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 536 {
 537         return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
 538                      massage_pgprot(pgprot));
 539 }
 540
 541 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
 542 {
 543         return __pud(((phys_addr_t)page_nr << PAGE_SHIFT) |
 544                      massage_pgprot(pgprot));
 545 }
 546
 547 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 548 {
 549         pteval_t val = pte_val(pte);
 550
 551         /*
 552          * Chop off the NX bit (if present), and add the NX portion of
 553          * the newprot (if present):
 554          */
 555         val &= _PAGE_CHG_MASK;
 556         val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
 557
 558         return __pte(val);
 559 }
 560
 561 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 562 {
 563         pmdval_t val = pmd_val(pmd);
 564
 565         val &= _HPAGE_CHG_MASK;
 566         val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
 567
 568         return __pmd(val);
 569 }
 570
 571 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
 572 #define pgprot_modify pgprot_modify
 573 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
 574 {
 575         pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
 576         pgprotval_t addbits = pgprot_val(newprot);
 577         return __pgprot(preservebits | addbits);
 578 }
 579
 580 #define pte_pgprot(x) __pgprot(pte_flags(x))
 581 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
 582 #define pud_pgprot(x) __pgprot(pud_flags(x))
 583 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
 584
 585 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
 586
 587 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
 588                                          enum page_cache_mode pcm,
 589                                          enum page_cache_mode new_pcm)
 590 {
 591         /*
 592          * PAT type is always WB for untracked ranges, so no need to check.
 593          */
 594         if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
 595                 return 1;
 596
 597         /*
 598          * Certain new memtypes are not allowed with certain
 599          * requested memtype:
 600          * - request is uncached, return cannot be write-back
 601          * - request is write-combine, return cannot be write-back
 602          * - request is write-through, return cannot be write-back
 603          * - request is write-through, return cannot be write-combine
 604          */
 605         if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
 606              new_pcm == _PAGE_CACHE_MODE_WB) ||
 607             (pcm == _PAGE_CACHE_MODE_WC &&
 608              new_pcm == _PAGE_CACHE_MODE_WB) ||
 609             (pcm == _PAGE_CACHE_MODE_WT &&
 610              new_pcm == _PAGE_CACHE_MODE_WB) ||
 611             (pcm == _PAGE_CACHE_MODE_WT &&
 612              new_pcm == _PAGE_CACHE_MODE_WC)) {
 613                 return 0;
 614         }
 615
 616         return 1;
 617 }
 618
 619 pmd_t *populate_extra_pmd(unsigned long vaddr);
 620 pte_t *populate_extra_pte(unsigned long vaddr);
 621 #endif  /* __ASSEMBLY__ */
 622
 623 #ifdef CONFIG_X86_32
 624 # include <asm/pgtable_32.h>
 625 #else
 626 # include <asm/pgtable_64.h>
 627 #endif
 628
 629 #ifndef __ASSEMBLY__
 630 #include <linux/mm_types.h>
 631 #include <linux/mmdebug.h>
 632 #include <linux/log2.h>
 633 #include <asm/fixmap.h>
 634
 635 static inline int pte_none(pte_t pte)
 636 {
 637         return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
 638 }
 639
 640 #define __HAVE_ARCH_PTE_SAME
 641 static inline int pte_same(pte_t a, pte_t b)
 642 {
 643         return a.pte == b.pte;
 644 }
 645
 646 static inline int pte_present(pte_t a)
 647 {
 648         return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
 649 }
 650
 651 #ifdef __HAVE_ARCH_PTE_DEVMAP
 652 static inline int pte_devmap(pte_t a)
 653 {
 654         return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
 655 }
 656 #endif
 657
 658 #define pte_accessible pte_accessible
 659 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
 660 {
 661         if (pte_flags(a) & _PAGE_PRESENT)
 662                 return true;
 663
 664         if ((pte_flags(a) & _PAGE_PROTNONE) &&
 665                         mm_tlb_flush_pending(mm))
 666                 return true;
 667
 668         return false;
 669 }
 670
 671 static inline int pmd_present(pmd_t pmd)
 672 {
 673         /*
 674          * Checking for _PAGE_PSE is needed too because
 675          * split_huge_page will temporarily clear the present bit (but
 676          * the _PAGE_PSE flag will remain set at all times while the
 677          * _PAGE_PRESENT bit is clear).
 678          */
 679         return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
 680 }
 681
 682 #ifdef CONFIG_NUMA_BALANCING
 683 /*
 684  * These work without NUMA balancing but the kernel does not care. See the
 685  * comment in include/asm-generic/pgtable.h
 686  */
 687 static inline int pte_protnone(pte_t pte)
 688 {
 689         return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
 690                 == _PAGE_PROTNONE;
 691 }
 692
 693 static inline int pmd_protnone(pmd_t pmd)
 694 {
 695         return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
 696                 == _PAGE_PROTNONE;
 697 }
 698 #endif /* CONFIG_NUMA_BALANCING */
 699
 700 static inline int pmd_none(pmd_t pmd)
 701 {
 702         /* Only check low word on 32-bit platforms, since it might be
 703            out of sync with upper half. */
 704         unsigned long val = native_pmd_val(pmd);
 705         return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
 706 }
 707
 708 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 709 {
 710         return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
 711 }
 712
 713 /*
 714  * Currently stuck as a macro due to indirect forward reference to
 715  * linux/mmzone.h's __section_mem_map_addr() definition:
 716  */
 717 #define pmd_page(pmd)   pfn_to_page(pmd_pfn(pmd))
 718
 719 /*
 720  * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
 721  *
 722  * this macro returns the index of the entry in the pmd page which would
 723  * control the given virtual address
 724  */
 725 static inline unsigned long pmd_index(unsigned long address)
 726 {
 727         return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
 728 }
 729
 730 /*
 731  * Conversion functions: convert a page and protection to a page entry,
 732  * and a page entry and page directory to the page they refer to.
 733  *
 734  * (Currently stuck as a macro because of indirect forward reference
 735  * to linux/mm.h:page_to_nid())
 736  */
 737 #define mk_pte(page, pgprot)   pfn_pte(page_to_pfn(page), (pgprot))
 738
 739 /*
 740  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 741  *
 742  * this function returns the index of the entry in the pte page which would
 743  * control the given virtual address
 744  */
 745 static inline unsigned long pte_index(unsigned long address)
 746 {
 747         return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
 748 }
 749
 750 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
 751 {
 752         return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
 753 }
 754
 755 static inline int pmd_bad(pmd_t pmd)
 756 {
 757         return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
 758 }
 759
 760 static inline unsigned long pages_to_mb(unsigned long npg)
 761 {
 762         return npg >> (20 - PAGE_SHIFT);
 763 }
 764
 765 #if CONFIG_PGTABLE_LEVELS > 2
 766 static inline int pud_none(pud_t pud)
 767 {
 768         return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
 769 }
 770
 771 static inline int pud_present(pud_t pud)
 772 {
 773         return pud_flags(pud) & _PAGE_PRESENT;
 774 }
 775
 776 static inline unsigned long pud_page_vaddr(pud_t pud)
 777 {
 778         return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
 779 }
 780
 781 /*
 782  * Currently stuck as a macro due to indirect forward reference to
 783  * linux/mmzone.h's __section_mem_map_addr() definition:
 784  */
 785 #define pud_page(pud)   pfn_to_page(pud_pfn(pud))
 786
 787 /* Find an entry in the second-level page table.. */
 788 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
 789 {
 790         return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
 791 }
 792
 793 static inline int pud_large(pud_t pud)
 794 {
 795         return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 796                 (_PAGE_PSE | _PAGE_PRESENT);
 797 }
 798
 799 static inline int pud_bad(pud_t pud)
 800 {
 801         return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
 802 }
 803 #else
 804 static inline int pud_large(pud_t pud)
 805 {
 806         return 0;
 807 }
 808 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
 809
 810 static inline unsigned long pud_index(unsigned long address)
 811 {
 812         return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
 813 }
 814
 815 #if CONFIG_PGTABLE_LEVELS > 3
 816 static inline int p4d_none(p4d_t p4d)
 817 {
 818         return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
 819 }
 820
 821 static inline int p4d_present(p4d_t p4d)
 822 {
 823         return p4d_flags(p4d) & _PAGE_PRESENT;
 824 }
 825
 826 static inline unsigned long p4d_page_vaddr(p4d_t p4d)
 827 {
 828         return (unsigned long)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
 829 }
 830
 831 /*
 832  * Currently stuck as a macro due to indirect forward reference to
 833  * linux/mmzone.h's __section_mem_map_addr() definition:
 834  */
 835 #define p4d_page(p4d)   pfn_to_page(p4d_pfn(p4d))
 836
 837 /* Find an entry in the third-level page table.. */
 838 static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
 839 {
 840         return (pud_t *)p4d_page_vaddr(*p4d) + pud_index(address);
 841 }
 842
 843 static inline int p4d_bad(p4d_t p4d)
 844 {
 845         unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER;
 846
 847         if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
 848                 ignore_flags |= _PAGE_NX;
 849
 850         return (p4d_flags(p4d) & ~ignore_flags) != 0;
 851 }
 852 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
 853
 854 static inline unsigned long p4d_index(unsigned long address)
 855 {
 856         return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
 857 }
 858
 859 #if CONFIG_PGTABLE_LEVELS > 4
 860 static inline int pgd_present(pgd_t pgd)
 861 {
 862         return pgd_flags(pgd) & _PAGE_PRESENT;
 863 }
 864
 865 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 866 {
 867         return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
 868 }
 869
 870 /*
 871  * Currently stuck as a macro due to indirect forward reference to
 872  * linux/mmzone.h's __section_mem_map_addr() definition:
 873  */
 874 #define pgd_page(pgd)   pfn_to_page(pgd_pfn(pgd))
 875
 876 /* to find an entry in a page-table-directory. */
 877 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
 878 {
 879         return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
 880 }
 881
 882 static inline int pgd_bad(pgd_t pgd)
 883 {
 884         unsigned long ignore_flags = _PAGE_USER;
 885
 886         if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
 887                 ignore_flags |= _PAGE_NX;
 888
 889         return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
 890 }
 891
 892 static inline int pgd_none(pgd_t pgd)
 893 {
 894         /*
 895          * There is no need to do a workaround for the KNL stray
 896          * A/D bit erratum here.  PGDs only point to page tables
 897          * except on 32-bit non-PAE which is not supported on
 898          * KNL.
 899          */
 900         return !native_pgd_val(pgd);
 901 }
 902 #endif  /* CONFIG_PGTABLE_LEVELS > 4 */
 903
 904 #endif  /* __ASSEMBLY__ */
 905
 906 /*
 907  * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
 908  *
 909  * this macro returns the index of the entry in the pgd page which would
 910  * control the given virtual address
 911  */
 912 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 913
 914 /*
 915  * pgd_offset() returns a (pgd_t *)
 916  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 917  */
 918 #define pgd_offset_pgd(pgd, address) (pgd + pgd_index((address)))
 919 /*
 920  * a shortcut to get a pgd_t in a given mm
 921  */
 922 #define pgd_offset(mm, address) pgd_offset_pgd((mm)->pgd, (address))
 923 /*
 924  * a shortcut which implies the use of the kernel's pgd, instead
 925  * of a process's
 926  */
 927 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
 928
 929
 930 #define KERNEL_PGD_BOUNDARY     pgd_index(PAGE_OFFSET)
 931 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
 932
 933 #ifndef __ASSEMBLY__
 934
 935 extern int direct_gbpages;
 936 void init_mem_mapping(void);
 937 void early_alloc_pgt_buf(void);
 938 extern void memblock_find_dma_reserve(void);
 939
 940 #ifdef CONFIG_X86_64
 941 /* Realmode trampoline initialization. */
 942 extern pgd_t trampoline_pgd_entry;
 943 static inline void __meminit init_trampoline_default(void)
 944 {
 945         /* Default trampoline pgd value */
 946         trampoline_pgd_entry = init_top_pgt[pgd_index(__PAGE_OFFSET)];
 947 }
 948 # ifdef CONFIG_RANDOMIZE_MEMORY
 949 void __meminit init_trampoline(void);
 950 # else
 951 #  define init_trampoline init_trampoline_default
 952 # endif
 953 #else
 954 static inline void init_trampoline(void) { }
 955 #endif
 956
 957 /* local pte updates need not use xchg for locking */
 958 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
 959 {
 960         pte_t res = *ptep;
 961
 962         /* Pure native function needs no input for mm, addr */
 963         native_pte_clear(NULL, 0, ptep);
 964         return res;
 965 }
 966
 967 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
 968 {
 969         pmd_t res = *pmdp;
 970
 971         native_pmd_clear(pmdp);
 972         return res;
 973 }
 974
 975 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
 976 {
 977         pud_t res = *pudp;
 978
 979         native_pud_clear(pudp);
 980         return res;
 981 }
 982
 983 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
 984                                      pte_t *ptep , pte_t pte)
 985 {
 986         native_set_pte(ptep, pte);
 987 }
 988
 989 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 990                               pmd_t *pmdp, pmd_t pmd)
 991 {
 992         native_set_pmd(pmdp, pmd);
 993 }
 994
 995 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
 996                               pud_t *pudp, pud_t pud)
 997 {
 998         native_set_pud(pudp, pud);
 999 }
1000
1001 /*
1002  * We only update the dirty/accessed state if we set
1003  * the dirty bit by hand in the kernel, since the hardware
1004  * will do the accessed bit for us, and we don't want to
1005  * race with other CPU's that might be updating the dirty
1006  * bit at the same time.
1007  */
1008 struct vm_area_struct;
1009
1010 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1011 extern int ptep_set_access_flags(struct vm_area_struct *vma,
1012                                  unsigned long address, pte_t *ptep,
1013                                  pte_t entry, int dirty);
1014
1015 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1016 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1017                                      unsigned long addr, pte_t *ptep);
1018
1019 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1020 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1021                                   unsigned long address, pte_t *ptep);
1022
1023 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1024 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1025                                        pte_t *ptep)
1026 {
1027         pte_t pte = native_ptep_get_and_clear(ptep);
1028         return pte;
1029 }
1030
1031 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1032 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1033                                             unsigned long addr, pte_t *ptep,
1034                                             int full)
1035 {
1036         pte_t pte;
1037         if (full) {
1038                 /*
1039                  * Full address destruction in progress; paravirt does not
1040                  * care about updates and native needs no locking
1041                  */
1042                 pte = native_local_ptep_get_and_clear(ptep);
1043         } else {
1044                 pte = ptep_get_and_clear(mm, addr, ptep);
1045         }
1046         return pte;
1047 }
1048
1049 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1050 static inline void ptep_set_wrprotect(struct mm_struct *mm,
1051                                       unsigned long addr, pte_t *ptep)
1052 {
1053         clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1054 }
1055
1056 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1057
1058 #define mk_pmd(page, pgprot)   pfn_pmd(page_to_pfn(page), (pgprot))
1059
1060 #define  __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1061 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1062                                  unsigned long address, pmd_t *pmdp,
1063                                  pmd_t entry, int dirty);
1064 extern int pudp_set_access_flags(struct vm_area_struct *vma,
1065                                  unsigned long address, pud_t *pudp,
1066                                  pud_t entry, int dirty);
1067
1068 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1069 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1070                                      unsigned long addr, pmd_t *pmdp);
1071 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1072                                      unsigned long addr, pud_t *pudp);
1073
1074 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1075 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1076                                   unsigned long address, pmd_t *pmdp);
1077
1078
1079 #define pmd_write pmd_write
1080 static inline int pmd_write(pmd_t pmd)
1081 {
1082         return pmd_flags(pmd) & _PAGE_RW;
1083 }
1084
1085 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1086 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1087                                        pmd_t *pmdp)
1088 {
1089         return native_pmdp_get_and_clear(pmdp);
1090 }
1091
1092 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1093 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1094                                         unsigned long addr, pud_t *pudp)
1095 {
1096         return native_pudp_get_and_clear(pudp);
1097 }
1098
1099 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1100 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1101                                       unsigned long addr, pmd_t *pmdp)
1102 {
1103         clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1104 }
1105
1106 #define pud_write pud_write
1107 static inline int pud_write(pud_t pud)
1108 {
1109         return pud_flags(pud) & _PAGE_RW;
1110 }
1111
1112 #ifndef pmdp_establish
1113 #define pmdp_establish pmdp_establish
1114 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1115                 unsigned long address, pmd_t *pmdp, pmd_t pmd)
1116 {
1117         if (IS_ENABLED(CONFIG_SMP)) {
1118                 return xchg(pmdp, pmd);
1119         } else {
1120                 pmd_t old = *pmdp;
1121                 *pmdp = pmd;
1122                 return old;
1123         }
1124 }
1125 #endif
1126
1127 /*
1128  * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1129  *
1130  *  dst - pointer to pgd range anwhere on a pgd page
1131  *  src - ""
1132  *  count - the number of pgds to copy.
1133  *
1134  * dst and src can be on the same page, but the range must not overlap,
1135  * and must not cross a page boundary.
1136  */
1137 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1138 {
1139         memcpy(dst, src, count * sizeof(pgd_t));
1140 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1141         if (!static_cpu_has(X86_FEATURE_PTI))
1142                 return;
1143         /* Clone the user space pgd as well */
1144         memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1145                count * sizeof(pgd_t));
1146 #endif
1147 }
1148
1149 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1150 static inline int page_level_shift(enum pg_level level)
1151 {
1152         return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1153 }
1154 static inline unsigned long page_level_size(enum pg_level level)
1155 {
1156         return 1UL << page_level_shift(level);
1157 }
1158 static inline unsigned long page_level_mask(enum pg_level level)
1159 {
1160         return ~(page_level_size(level) - 1);
1161 }
1162
1163 /*
1164  * The x86 doesn't have any external MMU info: the kernel page
1165  * tables contain all the necessary information.
1166  */
1167 static inline void update_mmu_cache(struct vm_area_struct *vma,
1168                 unsigned long addr, pte_t *ptep)
1169 {
1170 }
1171 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1172                 unsigned long addr, pmd_t *pmd)
1173 {
1174 }
1175 static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1176                 unsigned long addr, pud_t *pud)
1177 {
1178 }
1179
1180 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1181 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1182 {
1183         return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1184 }
1185
1186 static inline int pte_swp_soft_dirty(pte_t pte)
1187 {
1188         return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1189 }
1190
1191 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1192 {
1193         return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1194 }
1195
1196 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1197 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1198 {
1199         return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1200 }
1201
1202 static inline int pmd_swp_soft_dirty(pmd_t pmd)
1203 {
1204         return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1205 }
1206
1207 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1208 {
1209         return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1210 }
1211 #endif
1212 #endif
1213
1214 #define PKRU_AD_BIT 0x1
1215 #define PKRU_WD_BIT 0x2
1216 #define PKRU_BITS_PER_PKEY 2
1217
1218 static inline bool __pkru_allows_read(u32 pkru, u16 pkey)
1219 {
1220         int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1221         return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits));
1222 }
1223
1224 static inline bool __pkru_allows_write(u32 pkru, u16 pkey)
1225 {
1226         int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
1227         /*
1228          * Access-disable disables writes too so we need to check
1229          * both bits here.
1230          */
1231         return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits));
1232 }
1233
1234 static inline u16 pte_flags_pkey(unsigned long pte_flags)
1235 {
1236 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1237         /* ifdef to avoid doing 59-bit shift on 32-bit values */
1238         return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1239 #else
1240         return 0;
1241 #endif
1242 }
1243
1244 static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1245 {
1246         u32 pkru = read_pkru();
1247
1248         if (!__pkru_allows_read(pkru, pkey))
1249                 return false;
1250         if (write && !__pkru_allows_write(pkru, pkey))
1251                 return false;
1252
1253         return true;
1254 }
1255
1256 /*
1257  * 'pteval' can come from a PTE, PMD or PUD.  We only check
1258  * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1259  * same value on all 3 types.
1260  */
1261 static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1262 {
1263         unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1264
1265         if (write)
1266                 need_pte_bits |= _PAGE_RW;
1267
1268         if ((pteval & need_pte_bits) != need_pte_bits)
1269                 return 0;
1270
1271         return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1272 }
1273
1274 #define pte_access_permitted pte_access_permitted
1275 static inline bool pte_access_permitted(pte_t pte, bool write)
1276 {
1277         return __pte_access_permitted(pte_val(pte), write);
1278 }
1279
1280 #define pmd_access_permitted pmd_access_permitted
1281 static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1282 {
1283         return __pte_access_permitted(pmd_val(pmd), write);
1284 }
1285
1286 #define pud_access_permitted pud_access_permitted
1287 static inline bool pud_access_permitted(pud_t pud, bool write)
1288 {
1289         return __pte_access_permitted(pud_val(pud), write);
1290 }
1291
1292 #include <asm-generic/pgtable.h>
1293 #endif  /* __ASSEMBLY__ */
1294
1295 #endif /* _ASM_X86_PGTABLE_H */