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