Green shading in the line number column means the source is part of the translation unit, red means it is conditionally excluded. Highlighted line numbers link to the translation unit page. Highlighted macros link to the macro page.
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 */ 882: