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         __visible;
  27 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  28
  29 extern spinlock_t pgd_lock;
  30 extern struct list_head pgd_list;
  31
  32 extern struct mm_struct *pgd_page_get_mm(struct page *page);
  33
  34 #ifdef CONFIG_PARAVIRT
  35 #include <asm/paravirt.h>
  36 #else  /* !CONFIG_PARAVIRT */
  37 #define set_pte(ptep, pte)              native_set_pte(ptep, pte)
  38 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
  39 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
  40
  41 #define set_pte_atomic(ptep, pte)                                       \
  42         native_set_pte_atomic(ptep, pte)
  43
  44 #define set_pmd(pmdp, pmd)              native_set_pmd(pmdp, pmd)
  45
  46 #ifndef __PAGETABLE_PUD_FOLDED
  47 #define set_pgd(pgdp, pgd)              native_set_pgd(pgdp, pgd)
  48 #define pgd_clear(pgd)                  native_pgd_clear(pgd)
  49 #endif
  50
  51 #ifndef set_pud
  52 # define set_pud(pudp, pud)             native_set_pud(pudp, pud)
  53 #endif
  54
  55 #ifndef __PAGETABLE_PMD_FOLDED
  56 #define pud_clear(pud)                  native_pud_clear(pud)
  57 #endif
  58
  59 #define pte_clear(mm, addr, ptep)       native_pte_clear(mm, addr, ptep)
  60 #define pmd_clear(pmd)                  native_pmd_clear(pmd)
  61
  62 #define pte_update(mm, addr, ptep)              do { } while (0)
  63 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
  64 #define pmd_update(mm, addr, ptep)              do { } while (0)
  65 #define pmd_update_defer(mm, addr, ptep)        do { } while (0)
  66
  67 #define pgd_val(x)      native_pgd_val(x)
  68 #define __pgd(x)        native_make_pgd(x)
  69
  70 #ifndef __PAGETABLE_PUD_FOLDED
  71 #define pud_val(x)      native_pud_val(x)
  72 #define __pud(x)        native_make_pud(x)
  73 #endif
  74
  75 #ifndef __PAGETABLE_PMD_FOLDED
  76 #define pmd_val(x)      native_pmd_val(x)
  77 #define __pmd(x)        native_make_pmd(x)
  78 #endif
  79
  80 #define pte_val(x)      native_pte_val(x)
  81 #define __pte(x)        native_make_pte(x)
  82
  83 #define arch_end_context_switch(prev)   do {} while(0)
  84
  85 #endif  /* CONFIG_PARAVIRT */
  86
  87 /*
  88  * The following only work if pte_present() is true.
  89  * Undefined behaviour if not..
  90  */
  91 static inline int pte_dirty(pte_t pte)
  92 {
  93         return pte_flags(pte) & _PAGE_DIRTY;
  94 }
  95
  96 static inline int pte_young(pte_t pte)
  97 {
  98         return pte_flags(pte) & _PAGE_ACCESSED;
  99 }
 100
 101 static inline int pmd_young(pmd_t pmd)
 102 {
 103         return pmd_flags(pmd) & _PAGE_ACCESSED;
 104 }
 105
 106 static inline int pte_write(pte_t pte)
 107 {
 108         return pte_flags(pte) & _PAGE_RW;
 109 }
 110
 111 static inline int pte_file(pte_t pte)
 112 {
 113         return pte_flags(pte) & _PAGE_FILE;
 114 }
 115
 116 static inline int pte_huge(pte_t pte)
 117 {
 118         return pte_flags(pte) & _PAGE_PSE;
 119 }
 120
 121 static inline int pte_global(pte_t pte)
 122 {
 123         return pte_flags(pte) & _PAGE_GLOBAL;
 124 }
 125
 126 static inline int pte_exec(pte_t pte)
 127 {
 128         return !(pte_flags(pte) & _PAGE_NX);
 129 }
 130
 131 static inline int pte_special(pte_t pte)
 132 {
 133         return pte_flags(pte) & _PAGE_SPECIAL;
 134 }
 135
 136 static inline unsigned long pte_pfn(pte_t pte)
 137 {
 138         return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
 139 }
 140
 141 static inline unsigned long pmd_pfn(pmd_t pmd)
 142 {
 143         return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
 144 }
 145
 146 static inline unsigned long pud_pfn(pud_t pud)
 147 {
 148         return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;
 149 }
 150
 151 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 152
 153 static inline int pmd_large(pmd_t pte)
 154 {
 155         return pmd_flags(pte) & _PAGE_PSE;
 156 }
 157
 158 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 159 static inline int pmd_trans_splitting(pmd_t pmd)
 160 {
 161         return pmd_val(pmd) & _PAGE_SPLITTING;
 162 }
 163
 164 static inline int pmd_trans_huge(pmd_t pmd)
 165 {
 166         return pmd_val(pmd) & _PAGE_PSE;
 167 }
 168
 169 static inline int has_transparent_hugepage(void)
 170 {
 171         return cpu_has_pse;
 172 }
 173 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 174
 175 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
 176 {
 177         pteval_t v = native_pte_val(pte);
 178
 179         return native_make_pte(v | set);
 180 }
 181
 182 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
 183 {
 184         pteval_t v = native_pte_val(pte);
 185
 186         return native_make_pte(v & ~clear);
 187 }
 188
 189 static inline pte_t pte_mkclean(pte_t pte)
 190 {
 191         return pte_clear_flags(pte, _PAGE_DIRTY);
 192 }
 193
 194 static inline pte_t pte_mkold(pte_t pte)
 195 {
 196         return pte_clear_flags(pte, _PAGE_ACCESSED);
 197 }
 198
 199 static inline pte_t pte_wrprotect(pte_t pte)
 200 {
 201         return pte_clear_flags(pte, _PAGE_RW);
 202 }
 203
 204 static inline pte_t pte_mkexec(pte_t pte)
 205 {
 206         return pte_clear_flags(pte, _PAGE_NX);
 207 }
 208
 209 static inline pte_t pte_mkdirty(pte_t pte)
 210 {
 211         return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
 212 }
 213
 214 static inline pte_t pte_mkyoung(pte_t pte)
 215 {
 216         return pte_set_flags(pte, _PAGE_ACCESSED);
 217 }
 218
 219 static inline pte_t pte_mkwrite(pte_t pte)
 220 {
 221         return pte_set_flags(pte, _PAGE_RW);
 222 }
 223
 224 static inline pte_t pte_mkhuge(pte_t pte)
 225 {
 226         return pte_set_flags(pte, _PAGE_PSE);
 227 }
 228
 229 static inline pte_t pte_clrhuge(pte_t pte)
 230 {
 231         return pte_clear_flags(pte, _PAGE_PSE);
 232 }
 233
 234 static inline pte_t pte_mkglobal(pte_t pte)
 235 {
 236         return pte_set_flags(pte, _PAGE_GLOBAL);
 237 }
 238
 239 static inline pte_t pte_clrglobal(pte_t pte)
 240 {
 241         return pte_clear_flags(pte, _PAGE_GLOBAL);
 242 }
 243
 244 static inline pte_t pte_mkspecial(pte_t pte)
 245 {
 246         return pte_set_flags(pte, _PAGE_SPECIAL);
 247 }
 248
 249 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
 250 {
 251         pmdval_t v = native_pmd_val(pmd);
 252
 253         return __pmd(v | set);
 254 }
 255
 256 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
 257 {
 258         pmdval_t v = native_pmd_val(pmd);
 259
 260         return __pmd(v & ~clear);
 261 }
 262
 263 static inline pmd_t pmd_mkold(pmd_t pmd)
 264 {
 265         return pmd_clear_flags(pmd, _PAGE_ACCESSED);
 266 }
 267
 268 static inline pmd_t pmd_wrprotect(pmd_t pmd)
 269 {
 270         return pmd_clear_flags(pmd, _PAGE_RW);
 271 }
 272
 273 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 274 {
 275         return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
 276 }
 277
 278 static inline pmd_t pmd_mkhuge(pmd_t pmd)
 279 {
 280         return pmd_set_flags(pmd, _PAGE_PSE);
 281 }
 282
 283 static inline pmd_t pmd_mkyoung(pmd_t pmd)
 284 {
 285         return pmd_set_flags(pmd, _PAGE_ACCESSED);
 286 }
 287
 288 static inline pmd_t pmd_mkwrite(pmd_t pmd)
 289 {
 290         return pmd_set_flags(pmd, _PAGE_RW);
 291 }
 292
 293 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 294 {
 295         return pmd_clear_flags(pmd, _PAGE_PRESENT);
 296 }
 297
 298 static inline int pte_soft_dirty(pte_t pte)
 299 {
 300         return pte_flags(pte) & _PAGE_SOFT_DIRTY;
 301 }
 302
 303 static inline int pmd_soft_dirty(pmd_t pmd)
 304 {
 305         return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
 306 }
 307
 308 static inline pte_t pte_mksoft_dirty(pte_t pte)
 309 {
 310         return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
 311 }
 312
 313 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
 314 {
 315         return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
 316 }
 317
 318 static inline pte_t pte_file_clear_soft_dirty(pte_t pte)
 319 {
 320         return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
 321 }
 322
 323 static inline pte_t pte_file_mksoft_dirty(pte_t pte)
 324 {
 325         return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
 326 }
 327
 328 static inline int pte_file_soft_dirty(pte_t pte)
 329 {
 330         return pte_flags(pte) & _PAGE_SOFT_DIRTY;
 331 }
 332
 333 /*
 334  * Mask out unsupported bits in a present pgprot.  Non-present pgprots
 335  * can use those bits for other purposes, so leave them be.
 336  */
 337 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
 338 {
 339         pgprotval_t protval = pgprot_val(pgprot);
 340
 341         if (protval & _PAGE_PRESENT)
 342                 protval &= __supported_pte_mask;
 343
 344         return protval;
 345 }
 346
 347 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
 348 {
 349         return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
 350                      massage_pgprot(pgprot));
 351 }
 352
 353 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
 354 {
 355         return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
 356                      massage_pgprot(pgprot));
 357 }
 358
 359 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 360 {
 361         pteval_t val = pte_val(pte);
 362
 363         /*
 364          * Chop off the NX bit (if present), and add the NX portion of
 365          * the newprot (if present):
 366          */
 367         val &= _PAGE_CHG_MASK;
 368         val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
 369
 370         return __pte(val);
 371 }
 372
 373 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
 374 {
 375         pmdval_t val = pmd_val(pmd);
 376
 377         val &= _HPAGE_CHG_MASK;
 378         val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
 379
 380         return __pmd(val);
 381 }
 382
 383 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
 384 #define pgprot_modify pgprot_modify
 385 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
 386 {
 387         pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
 388         pgprotval_t addbits = pgprot_val(newprot);
 389         return __pgprot(preservebits | addbits);
 390 }
 391
 392 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
 393
 394 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
 395
 396 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
 397                                          unsigned long flags,
 398                                          unsigned long new_flags)
 399 {
 400         /*
 401          * PAT type is always WB for untracked ranges, so no need to check.
 402          */
 403         if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
 404                 return 1;
 405
 406         /*
 407          * Certain new memtypes are not allowed with certain
 408          * requested memtype:
 409          * - request is uncached, return cannot be write-back
 410          * - request is write-combine, return cannot be write-back
 411          */
 412         if ((flags == _PAGE_CACHE_UC_MINUS &&
 413              new_flags == _PAGE_CACHE_WB) ||
 414             (flags == _PAGE_CACHE_WC &&
 415              new_flags == _PAGE_CACHE_WB)) {
 416                 return 0;
 417         }
 418
 419         return 1;
 420 }
 421
 422 pmd_t *populate_extra_pmd(unsigned long vaddr);
 423 pte_t *populate_extra_pte(unsigned long vaddr);
 424 #endif  /* __ASSEMBLY__ */
 425
 426 #ifdef CONFIG_X86_32
 427 # include <asm/pgtable_32.h>
 428 #else
 429 # include <asm/pgtable_64.h>
 430 #endif
 431
 432 #ifndef __ASSEMBLY__
 433 #include <linux/mm_types.h>
 434 #include <linux/mmdebug.h>
 435 #include <linux/log2.h>
 436
 437 static inline int pte_none(pte_t pte)
 438 {
 439         return !pte.pte;
 440 }
 441
 442 #define __HAVE_ARCH_PTE_SAME
 443 static inline int pte_same(pte_t a, pte_t b)
 444 {
 445         return a.pte == b.pte;
 446 }
 447
 448 static inline int pte_present(pte_t a)
 449 {
 450         return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE |
 451                                _PAGE_NUMA);
 452 }
 453
 454 #define pte_accessible pte_accessible
 455 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
 456 {
 457         if (pte_flags(a) & _PAGE_PRESENT)
 458                 return true;
 459
 460         if ((pte_flags(a) & (_PAGE_PROTNONE | _PAGE_NUMA)) &&
 461                         mm_tlb_flush_pending(mm))
 462                 return true;
 463
 464         return false;
 465 }
 466
 467 static inline int pte_hidden(pte_t pte)
 468 {
 469         return pte_flags(pte) & _PAGE_HIDDEN;
 470 }
 471
 472 static inline int pmd_present(pmd_t pmd)
 473 {
 474         /*
 475          * Checking for _PAGE_PSE is needed too because
 476          * split_huge_page will temporarily clear the present bit (but
 477          * the _PAGE_PSE flag will remain set at all times while the
 478          * _PAGE_PRESENT bit is clear).
 479          */
 480         return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE |
 481                                  _PAGE_NUMA);
 482 }
 483
 484 static inline int pmd_none(pmd_t pmd)
 485 {
 486         /* Only check low word on 32-bit platforms, since it might be
 487            out of sync with upper half. */
 488         return (unsigned long)native_pmd_val(pmd) == 0;
 489 }
 490
 491 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
 492 {
 493         return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
 494 }
 495
 496 /*
 497  * Currently stuck as a macro due to indirect forward reference to
 498  * linux/mmzone.h's __section_mem_map_addr() definition:
 499  */
 500 #define pmd_page(pmd)   pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
 501
 502 /*
 503  * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
 504  *
 505  * this macro returns the index of the entry in the pmd page which would
 506  * control the given virtual address
 507  */
 508 static inline unsigned long pmd_index(unsigned long address)
 509 {
 510         return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
 511 }
 512
 513 /*
 514  * Conversion functions: convert a page and protection to a page entry,
 515  * and a page entry and page directory to the page they refer to.
 516  *
 517  * (Currently stuck as a macro because of indirect forward reference
 518  * to linux/mm.h:page_to_nid())
 519  */
 520 #define mk_pte(page, pgprot)   pfn_pte(page_to_pfn(page), (pgprot))
 521
 522 /*
 523  * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
 524  *
 525  * this function returns the index of the entry in the pte page which would
 526  * control the given virtual address
 527  */
 528 static inline unsigned long pte_index(unsigned long address)
 529 {
 530         return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
 531 }
 532
 533 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
 534 {
 535         return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
 536 }
 537
 538 static inline int pmd_bad(pmd_t pmd)
 539 {
 540 #ifdef CONFIG_NUMA_BALANCING
 541         /* pmd_numa check */
 542         if ((pmd_flags(pmd) & (_PAGE_NUMA|_PAGE_PRESENT)) == _PAGE_NUMA)
 543                 return 0;
 544 #endif
 545         return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
 546 }
 547
 548 static inline unsigned long pages_to_mb(unsigned long npg)
 549 {
 550         return npg >> (20 - PAGE_SHIFT);
 551 }
 552
 553 #if PAGETABLE_LEVELS > 2
 554 static inline int pud_none(pud_t pud)
 555 {
 556         return native_pud_val(pud) == 0;
 557 }
 558
 559 static inline int pud_present(pud_t pud)
 560 {
 561         return pud_flags(pud) & _PAGE_PRESENT;
 562 }
 563
 564 static inline unsigned long pud_page_vaddr(pud_t pud)
 565 {
 566         return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
 567 }
 568
 569 /*
 570  * Currently stuck as a macro due to indirect forward reference to
 571  * linux/mmzone.h's __section_mem_map_addr() definition:
 572  */
 573 #define pud_page(pud)           pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
 574
 575 /* Find an entry in the second-level page table.. */
 576 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
 577 {
 578         return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
 579 }
 580
 581 static inline int pud_large(pud_t pud)
 582 {
 583         return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
 584                 (_PAGE_PSE | _PAGE_PRESENT);
 585 }
 586
 587 static inline int pud_bad(pud_t pud)
 588 {
 589         return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
 590 }
 591 #else
 592 static inline int pud_large(pud_t pud)
 593 {
 594         return 0;
 595 }
 596 #endif  /* PAGETABLE_LEVELS > 2 */
 597
 598 #if PAGETABLE_LEVELS > 3
 599 static inline int pgd_present(pgd_t pgd)
 600 {
 601         return pgd_flags(pgd) & _PAGE_PRESENT;
 602 }
 603
 604 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
 605 {
 606         return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
 607 }
 608
 609 /*
 610  * Currently stuck as a macro due to indirect forward reference to
 611  * linux/mmzone.h's __section_mem_map_addr() definition:
 612  */
 613 #define pgd_page(pgd)           pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
 614
 615 /* to find an entry in a page-table-directory. */
 616 static inline unsigned long pud_index(unsigned long address)
 617 {
 618         return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
 619 }
 620
 621 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
 622 {
 623         return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
 624 }
 625
 626 static inline int pgd_bad(pgd_t pgd)
 627 {
 628         return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
 629 }
 630
 631 static inline int pgd_none(pgd_t pgd)
 632 {
 633         return !native_pgd_val(pgd);
 634 }
 635 #endif  /* PAGETABLE_LEVELS > 3 */
 636
 637 #endif  /* __ASSEMBLY__ */
 638
 639 /*
 640  * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
 641  *
 642  * this macro returns the index of the entry in the pgd page which would
 643  * control the given virtual address
 644  */
 645 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 646
 647 /*
 648  * pgd_offset() returns a (pgd_t *)
 649  * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
 650  */
 651 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
 652 /*
 653  * a shortcut which implies the use of the kernel's pgd, instead
 654  * of a process's
 655  */
 656 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
 657
 658
 659 #define KERNEL_PGD_BOUNDARY     pgd_index(PAGE_OFFSET)
 660 #define KERNEL_PGD_PTRS         (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
 661
 662 #ifndef __ASSEMBLY__
 663
 664 extern int direct_gbpages;
 665 void init_mem_mapping(void);
 666 void early_alloc_pgt_buf(void);
 667
 668 /* local pte updates need not use xchg for locking */
 669 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
 670 {
 671         pte_t res = *ptep;
 672
 673         /* Pure native function needs no input for mm, addr */
 674         native_pte_clear(NULL, 0, ptep);
 675         return res;
 676 }
 677
 678 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
 679 {
 680         pmd_t res = *pmdp;
 681
 682         native_pmd_clear(pmdp);
 683         return res;
 684 }
 685
 686 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
 687                                      pte_t *ptep , pte_t pte)
 688 {
 689         native_set_pte(ptep, pte);
 690 }
 691
 692 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
 693                                      pmd_t *pmdp , pmd_t pmd)
 694 {
 695         native_set_pmd(pmdp, pmd);
 696 }
 697
 698 #ifndef CONFIG_PARAVIRT
 699 /*
 700  * Rules for using pte_update - it must be called after any PTE update which
 701  * has not been done using the set_pte / clear_pte interfaces.  It is used by
 702  * shadow mode hypervisors to resynchronize the shadow page tables.  Kernel PTE
 703  * updates should either be sets, clears, or set_pte_atomic for P->P
 704  * transitions, which means this hook should only be called for user PTEs.
 705  * This hook implies a P->P protection or access change has taken place, which
 706  * requires a subsequent TLB flush.  The notification can optionally be delayed
 707  * until the TLB flush event by using the pte_update_defer form of the
 708  * interface, but care must be taken to assure that the flush happens while
 709  * still holding the same page table lock so that the shadow and primary pages
 710  * do not become out of sync on SMP.
 711  */
 712 #define pte_update(mm, addr, ptep)              do { } while (0)
 713 #define pte_update_defer(mm, addr, ptep)        do { } while (0)
 714 #endif
 715
 716 /*
 717  * We only update the dirty/accessed state if we set
 718  * the dirty bit by hand in the kernel, since the hardware
 719  * will do the accessed bit for us, and we don't want to
 720  * race with other CPU's that might be updating the dirty
 721  * bit at the same time.
 722  */
 723 struct vm_area_struct;
 724
 725 #define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 726 extern int ptep_set_access_flags(struct vm_area_struct *vma,
 727                                  unsigned long address, pte_t *ptep,
 728                                  pte_t entry, int dirty);
 729
 730 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
 731 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
 732                                      unsigned long addr, pte_t *ptep);
 733
 734 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
 735 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
 736                                   unsigned long address, pte_t *ptep);
 737
 738 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 739 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 740                                        pte_t *ptep)
 741 {
 742         pte_t pte = native_ptep_get_and_clear(ptep);
 743         pte_update(mm, addr, ptep);
 744         return pte;
 745 }
 746
 747 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
 748 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 749                                             unsigned long addr, pte_t *ptep,
 750                                             int full)
 751 {
 752         pte_t pte;
 753         if (full) {
 754                 /*
 755                  * Full address destruction in progress; paravirt does not
 756                  * care about updates and native needs no locking
 757                  */
 758                 pte = native_local_ptep_get_and_clear(ptep);
 759         } else {
 760                 pte = ptep_get_and_clear(mm, addr, ptep);
 761         }
 762         return pte;
 763 }
 764
 765 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
 766 static inline void ptep_set_wrprotect(struct mm_struct *mm,
 767                                       unsigned long addr, pte_t *ptep)
 768 {
 769         clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
 770         pte_update(mm, addr, ptep);
 771 }
 772
 773 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
 774
 775 #define mk_pmd(page, pgprot)   pfn_pmd(page_to_pfn(page), (pgprot))
 776
 777 #define  __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
 778 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
 779                                  unsigned long address, pmd_t *pmdp,
 780                                  pmd_t entry, int dirty);
 781
 782 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
 783 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 784                                      unsigned long addr, pmd_t *pmdp);
 785
 786 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
 787 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
 788                                   unsigned long address, pmd_t *pmdp);
 789
 790
 791 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
 792 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
 793                                  unsigned long addr, pmd_t *pmdp);
 794
 795 #define __HAVE_ARCH_PMD_WRITE
 796 static inline int pmd_write(pmd_t pmd)
 797 {
 798         return pmd_flags(pmd) & _PAGE_RW;
 799 }
 800
 801 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
 802 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
 803                                        pmd_t *pmdp)
 804 {
 805         pmd_t pmd = native_pmdp_get_and_clear(pmdp);
 806         pmd_update(mm, addr, pmdp);
 807         return pmd;
 808 }
 809
 810 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
 811 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
 812                                       unsigned long addr, pmd_t *pmdp)
 813 {
 814         clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
 815         pmd_update(mm, addr, pmdp);
 816 }
 817
 818 /*
 819  * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
 820  *
 821  *  dst - pointer to pgd range anwhere on a pgd page
 822  *  src - ""
 823  *  count - the number of pgds to copy.
 824  *
 825  * dst and src can be on the same page, but the range must not overlap,
 826  * and must not cross a page boundary.
 827  */
 828 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
 829 {
 830        memcpy(dst, src, count * sizeof(pgd_t));
 831 }
 832
 833 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
 834 static inline int page_level_shift(enum pg_level level)
 835 {
 836         return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
 837 }
 838 static inline unsigned long page_level_size(enum pg_level level)
 839 {
 840         return 1UL << page_level_shift(level);
 841 }
 842 static inline unsigned long page_level_mask(enum pg_level level)
 843 {
 844         return ~(page_level_size(level) - 1);
 845 }
 846
 847 /*
 848  * The x86 doesn't have any external MMU info: the kernel page
 849  * tables contain all the necessary information.
 850  */
 851 static inline void update_mmu_cache(struct vm_area_struct *vma,
 852                 unsigned long addr, pte_t *ptep)
 853 {
 854 }
 855 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
 856                 unsigned long addr, pmd_t *pmd)
 857 {
 858 }
 859
 860 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
 861 {
 862         VM_BUG_ON(pte_present(pte));
 863         return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
 864 }
 865
 866 static inline int pte_swp_soft_dirty(pte_t pte)
 867 {
 868         VM_BUG_ON(pte_present(pte));
 869         return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
 870 }
 871
 872 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
 873 {
 874         VM_BUG_ON(pte_present(pte));
 875         return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
 876 }
 877
 878 #include <asm-generic/pgtable.h>
 879 #endif  /* __ASSEMBLY__ */
 880
 881 #endif /* _ASM_X86_PGTABLE_H */