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) | \ 15 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \ 16 : (prot)) 17 18 #ifndef __ASSEMBLY__ 19 #include <asm/x86_init.h> 20 21 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd); 22 void ptdump_walk_pgd_level_checkwx(void); 23 24 #ifdef CONFIG_DEBUG_WX 25 #define debug_checkwx() ptdump_walk_pgd_level_checkwx() 26 #else 27 #define debug_checkwx() do { } while (0) 28 #endif 29 30 /* 31 * ZERO_PAGE is a global shared page that is always zero: used 32 * for zero-mapped memory areas etc.. 33 */ 34 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 35 __visible; 36 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 37 38 extern spinlock_t pgd_lock; 39 extern struct list_head pgd_list; 40 41 extern struct mm_struct *pgd_page_get_mm(struct page *page); 42 43 #ifdef CONFIG_PARAVIRT 44 #include <asm/paravirt.h> 45 #else /* !CONFIG_PARAVIRT */ 46 #define set_pte(ptep, pte) native_set_pte(ptep, pte) 47 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte) 48 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd) 49 50 #define set_pte_atomic(ptep, pte) \ 51 native_set_pte_atomic(ptep, pte) 52 53 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd) 54 55 #ifndef __PAGETABLE_PUD_FOLDED 56 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd) 57 #define pgd_clear(pgd) native_pgd_clear(pgd) 58 #endif 59 60 #ifndef set_pud 61 # define set_pud(pudp, pud) native_set_pud(pudp, pud) 62 #endif 63 64 #ifndef __PAGETABLE_PMD_FOLDED 65 #define pud_clear(pud) native_pud_clear(pud) 66 #endif 67 68 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep) 69 #define pmd_clear(pmd) native_pmd_clear(pmd) 70 71 #define pte_update(mm, addr, ptep) do { } while (0) 72 #define pte_update_defer(mm, addr, ptep) do { } while (0) 73 #define pmd_update(mm, addr, ptep) do { } while (0) 74 #define pmd_update_defer(mm, addr, ptep) do { } while (0) 75 76 #define pgd_val(x) native_pgd_val(x) 77 #define __pgd(x) native_make_pgd(x) 78 79 #ifndef __PAGETABLE_PUD_FOLDED 80 #define pud_val(x) native_pud_val(x) 81 #define __pud(x) native_make_pud(x) 82 #endif 83 84 #ifndef __PAGETABLE_PMD_FOLDED 85 #define pmd_val(x) native_pmd_val(x) 86 #define __pmd(x) native_make_pmd(x) 87 #endif 88 89 #define pte_val(x) native_pte_val(x) 90 #define __pte(x) native_make_pte(x) 91 92 #define arch_end_context_switch(prev) do {} while(0) 93 94 #endif /* CONFIG_PARAVIRT */ 95 96 /* 97 * The following only work if pte_present() is true. 98 * Undefined behaviour if not.. 99 */ 100 static inline int pte_dirty(pte_t pte) 101 { 102 return pte_flags(pte) & _PAGE_DIRTY; 103 } 104 105 static inline int pte_young(pte_t pte) 106 { 107 return pte_flags(pte) & _PAGE_ACCESSED; 108 } 109 110 static inline int pmd_dirty(pmd_t pmd) 111 { 112 return pmd_flags(pmd) & _PAGE_DIRTY; 113 } 114 115 static inline int pmd_young(pmd_t pmd) 116 { 117 return pmd_flags(pmd) & _PAGE_ACCESSED; 118 } 119 120 static inline int pte_write(pte_t pte) 121 { 122 return pte_flags(pte) & _PAGE_RW; 123 } 124 125 static inline int pte_huge(pte_t pte) 126 { 127 return pte_flags(pte) & _PAGE_PSE; 128 } 129 130 static inline int pte_global(pte_t pte) 131 { 132 return pte_flags(pte) & _PAGE_GLOBAL; 133 } 134 135 static inline int pte_exec(pte_t pte) 136 { 137 return !(pte_flags(pte) & _PAGE_NX); 138 } 139 140 static inline int pte_special(pte_t pte) 141 { 142 return pte_flags(pte) & _PAGE_SPECIAL; 143 } 144 145 static inline unsigned long pte_pfn(pte_t pte) 146 { 147 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT; 148 } 149 150 static inline unsigned long pmd_pfn(pmd_t pmd) 151 { 152 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT; 153 } 154 155 static inline unsigned long pud_pfn(pud_t pud) 156 { 157 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT; 158 } 159 160 #define pte_page(pte) pfn_to_page(pte_pfn(pte)) 161 162 static inline int pmd_large(pmd_t pte) 163 { 164 return pmd_flags(pte) & _PAGE_PSE; 165 } 166 167 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 168 static inline int pmd_trans_splitting(pmd_t pmd) 169 { 170 return pmd_val(pmd) & _PAGE_SPLITTING; 171 } 172 173 static inline int pmd_trans_huge(pmd_t pmd) 174 { 175 return pmd_val(pmd) & _PAGE_PSE; 176 } 177 178 static inline int has_transparent_hugepage(void) 179 { 180 return cpu_has_pse; 181 } 182 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 183 184 static inline pte_t pte_set_flags(pte_t pte, pteval_t set) 185 { 186 pteval_t v = native_pte_val(pte); 187 188 return native_make_pte(v | set); 189 } 190 191 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear) 192 { 193 pteval_t v = native_pte_val(pte); 194 195 return native_make_pte(v & ~clear); 196 } 197 198 static inline pte_t pte_mkclean(pte_t pte) 199 { 200 return pte_clear_flags(pte, _PAGE_DIRTY); 201 } 202 203 static inline pte_t pte_mkold(pte_t pte) 204 { 205 return pte_clear_flags(pte, _PAGE_ACCESSED); 206 } 207 208 static inline pte_t pte_wrprotect(pte_t pte) 209 { 210 return pte_clear_flags(pte, _PAGE_RW); 211 } 212 213 static inline pte_t pte_mkexec(pte_t pte) 214 { 215 return pte_clear_flags(pte, _PAGE_NX); 216 } 217 218 static inline pte_t pte_mkdirty(pte_t pte) 219 { 220 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); 221 } 222 223 static inline pte_t pte_mkyoung(pte_t pte) 224 { 225 return pte_set_flags(pte, _PAGE_ACCESSED); 226 } 227 228 static inline pte_t pte_mkwrite(pte_t pte) 229 { 230 return pte_set_flags(pte, _PAGE_RW); 231 } 232 233 static inline pte_t pte_mkhuge(pte_t pte) 234 { 235 return pte_set_flags(pte, _PAGE_PSE); 236 } 237 238 static inline pte_t pte_clrhuge(pte_t pte) 239 { 240 return pte_clear_flags(pte, _PAGE_PSE); 241 } 242 243 static inline pte_t pte_mkglobal(pte_t pte) 244 { 245 return pte_set_flags(pte, _PAGE_GLOBAL); 246 } 247 248 static inline pte_t pte_clrglobal(pte_t pte) 249 { 250 return pte_clear_flags(pte, _PAGE_GLOBAL); 251 } 252 253 static inline pte_t pte_mkspecial(pte_t pte) 254 { 255 return pte_set_flags(pte, _PAGE_SPECIAL); 256 } 257 258 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set) 259 { 260 pmdval_t v = native_pmd_val(pmd); 261 262 return __pmd(v | set); 263 } 264 265 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear) 266 { 267 pmdval_t v = native_pmd_val(pmd); 268 269 return __pmd(v & ~clear); 270 } 271 272 static inline pmd_t pmd_mkold(pmd_t pmd) 273 { 274 return pmd_clear_flags(pmd, _PAGE_ACCESSED); 275 } 276 277 static inline pmd_t pmd_wrprotect(pmd_t pmd) 278 { 279 return pmd_clear_flags(pmd, _PAGE_RW); 280 } 281 282 static inline pmd_t pmd_mkdirty(pmd_t pmd) 283 { 284 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY); 285 } 286 287 static inline pmd_t pmd_mkhuge(pmd_t pmd) 288 { 289 return pmd_set_flags(pmd, _PAGE_PSE); 290 } 291 292 static inline pmd_t pmd_mkyoung(pmd_t pmd) 293 { 294 return pmd_set_flags(pmd, _PAGE_ACCESSED); 295 } 296 297 static inline pmd_t pmd_mkwrite(pmd_t pmd) 298 { 299 return pmd_set_flags(pmd, _PAGE_RW); 300 } 301 302 static inline pmd_t pmd_mknotpresent(pmd_t pmd) 303 { 304 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE); 305 } 306 307 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 308 static inline int pte_soft_dirty(pte_t pte) 309 { 310 return pte_flags(pte) & _PAGE_SOFT_DIRTY; 311 } 312 313 static inline int pmd_soft_dirty(pmd_t pmd) 314 { 315 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY; 316 } 317 318 static inline pte_t pte_mksoft_dirty(pte_t pte) 319 { 320 return pte_set_flags(pte, _PAGE_SOFT_DIRTY); 321 } 322 323 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd) 324 { 325 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY); 326 } 327 328 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ 329 330 /* 331 * Mask out unsupported bits in a present pgprot. Non-present pgprots 332 * can use those bits for other purposes, so leave them be. 333 */ 334 static inline pgprotval_t massage_pgprot(pgprot_t pgprot) 335 { 336 pgprotval_t protval = pgprot_val(pgprot); 337 338 if (protval & _PAGE_PRESENT) 339 protval &= __supported_pte_mask; 340 341 return protval; 342 } 343 344 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) 345 { 346 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) | 347 massage_pgprot(pgprot)); 348 } 349 350 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) 351 { 352 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) | 353 massage_pgprot(pgprot)); 354 } 355 356 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 357 { 358 pteval_t val = pte_val(pte); 359 360 /* 361 * Chop off the NX bit (if present), and add the NX portion of 362 * the newprot (if present): 363 */ 364 val &= _PAGE_CHG_MASK; 365 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK; 366 367 return __pte(val); 368 } 369 370 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) 371 { 372 pmdval_t val = pmd_val(pmd); 373 374 val &= _HPAGE_CHG_MASK; 375 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK; 376 377 return __pmd(val); 378 } 379 380 /* mprotect needs to preserve PAT bits when updating vm_page_prot */ 381 #define pgprot_modify pgprot_modify 382 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) 383 { 384 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK; 385 pgprotval_t addbits = pgprot_val(newprot); 386 return __pgprot(preservebits | addbits); 387 } 388 389 #define pte_pgprot(x) __pgprot(pte_flags(x)) 390 #define pmd_pgprot(x) __pgprot(pmd_flags(x)) 391 #define pud_pgprot(x) __pgprot(pud_flags(x)) 392 393 #define canon_pgprot(p) __pgprot(massage_pgprot(p)) 394 395 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size, 396 enum page_cache_mode pcm, 397 enum page_cache_mode new_pcm) 398 { 399 /* 400 * PAT type is always WB for untracked ranges, so no need to check. 401 */ 402 if (x86_platform.is_untracked_pat_range(paddr, paddr + size)) 403 return 1; 404 405 /* 406 * Certain new memtypes are not allowed with certain 407 * requested memtype: 408 * - request is uncached, return cannot be write-back 409 * - request is write-combine, return cannot be write-back 410 * - request is write-through, return cannot be write-back 411 * - request is write-through, return cannot be write-combine 412 */ 413 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS && 414 new_pcm == _PAGE_CACHE_MODE_WB) || 415 (pcm == _PAGE_CACHE_MODE_WC && 416 new_pcm == _PAGE_CACHE_MODE_WB) || 417 (pcm == _PAGE_CACHE_MODE_WT && 418 new_pcm == _PAGE_CACHE_MODE_WB) || 419 (pcm == _PAGE_CACHE_MODE_WT && 420 new_pcm == _PAGE_CACHE_MODE_WC)) { 421 return 0; 422 } 423 424 return 1; 425 } 426 427 pmd_t *populate_extra_pmd(unsigned long vaddr); 428 pte_t *populate_extra_pte(unsigned long vaddr); 429 #endif /* __ASSEMBLY__ */ 430 431 #ifdef CONFIG_X86_32 432 # include <asm/pgtable_32.h> 433 #else 434 # include <asm/pgtable_64.h> 435 #endif 436 437 #ifndef __ASSEMBLY__ 438 #include <linux/mm_types.h> 439 #include <linux/mmdebug.h> 440 #include <linux/log2.h> 441 442 static inline int pte_none(pte_t pte) 443 { 444 return !pte.pte; 445 } 446 447 #define __HAVE_ARCH_PTE_SAME 448 static inline int pte_same(pte_t a, pte_t b) 449 { 450 return a.pte == b.pte; 451 } 452 453 static inline int pte_present(pte_t a) 454 { 455 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE); 456 } 457 458 #define pte_accessible pte_accessible 459 static inline bool pte_accessible(struct mm_struct *mm, pte_t a) 460 { 461 if (pte_flags(a) & _PAGE_PRESENT) 462 return true; 463 464 if ((pte_flags(a) & _PAGE_PROTNONE) && 465 mm_tlb_flush_pending(mm)) 466 return true; 467 468 return false; 469 } 470 471 static inline int pte_hidden(pte_t pte) 472 { 473 return pte_flags(pte) & _PAGE_HIDDEN; 474 } 475 476 static inline int pmd_present(pmd_t pmd) 477 { 478 /* 479 * Checking for _PAGE_PSE is needed too because 480 * split_huge_page will temporarily clear the present bit (but 481 * the _PAGE_PSE flag will remain set at all times while the 482 * _PAGE_PRESENT bit is clear). 483 */ 484 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE); 485 } 486 487 #ifdef CONFIG_NUMA_BALANCING 488 /* 489 * These work without NUMA balancing but the kernel does not care. See the 490 * comment in include/asm-generic/pgtable.h 491 */ 492 static inline int pte_protnone(pte_t pte) 493 { 494 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT)) 495 == _PAGE_PROTNONE; 496 } 497 498 static inline int pmd_protnone(pmd_t pmd) 499 { 500 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT)) 501 == _PAGE_PROTNONE; 502 } 503 #endif /* CONFIG_NUMA_BALANCING */ 504 505 static inline int pmd_none(pmd_t pmd) 506 { 507 /* Only check low word on 32-bit platforms, since it might be 508 out of sync with upper half. */ 509 return (unsigned long)native_pmd_val(pmd) == 0; 510 } 511 512 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 513 { 514 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd)); 515 } 516 517 /* 518 * Currently stuck as a macro due to indirect forward reference to 519 * linux/mmzone.h's __section_mem_map_addr() definition: 520 */ 521 #define pmd_page(pmd) \ 522 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT) 523 524 /* 525 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] 526 * 527 * this macro returns the index of the entry in the pmd page which would 528 * control the given virtual address 529 */ 530 static inline unsigned long pmd_index(unsigned long address) 531 { 532 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); 533 } 534 535 /* 536 * Conversion functions: convert a page and protection to a page entry, 537 * and a page entry and page directory to the page they refer to. 538 * 539 * (Currently stuck as a macro because of indirect forward reference 540 * to linux/mm.h:page_to_nid()) 541 */ 542 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 543 544 /* 545 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE] 546 * 547 * this function returns the index of the entry in the pte page which would 548 * control the given virtual address 549 */ 550 static inline unsigned long pte_index(unsigned long address) 551 { 552 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1); 553 } 554 555 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address) 556 { 557 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address); 558 } 559 560 static inline int pmd_bad(pmd_t pmd) 561 { 562 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE; 563 } 564 565 static inline unsigned long pages_to_mb(unsigned long npg) 566 { 567 return npg >> (20 - PAGE_SHIFT); 568 } 569 570 #if CONFIG_PGTABLE_LEVELS > 2 571 static inline int pud_none(pud_t pud) 572 { 573 return native_pud_val(pud) == 0; 574 } 575 576 static inline int pud_present(pud_t pud) 577 { 578 return pud_flags(pud) & _PAGE_PRESENT; 579 } 580 581 static inline unsigned long pud_page_vaddr(pud_t pud) 582 { 583 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud)); 584 } 585 586 /* 587 * Currently stuck as a macro due to indirect forward reference to 588 * linux/mmzone.h's __section_mem_map_addr() definition: 589 */ 590 #define pud_page(pud) \ 591 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT) 592 593 /* Find an entry in the second-level page table.. */ 594 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) 595 { 596 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); 597 } 598 599 static inline int pud_large(pud_t pud) 600 { 601 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) == 602 (_PAGE_PSE | _PAGE_PRESENT); 603 } 604 605 static inline int pud_bad(pud_t pud) 606 { 607 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0; 608 } 609 #else 610 static inline int pud_large(pud_t pud) 611 { 612 return 0; 613 } 614 #endif /* CONFIG_PGTABLE_LEVELS > 2 */ 615 616 #if CONFIG_PGTABLE_LEVELS > 3 617 static inline int pgd_present(pgd_t pgd) 618 { 619 return pgd_flags(pgd) & _PAGE_PRESENT; 620 } 621 622 static inline unsigned long pgd_page_vaddr(pgd_t pgd) 623 { 624 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK); 625 } 626 627 /* 628 * Currently stuck as a macro due to indirect forward reference to 629 * linux/mmzone.h's __section_mem_map_addr() definition: 630 */ 631 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT) 632 633 /* to find an entry in a page-table-directory. */ 634 static inline unsigned long pud_index(unsigned long address) 635 { 636 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1); 637 } 638 639 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address) 640 { 641 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address); 642 } 643 644 static inline int pgd_bad(pgd_t pgd) 645 { 646 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE; 647 } 648 649 static inline int pgd_none(pgd_t pgd) 650 { 651 return !native_pgd_val(pgd); 652 } 653 #endif /* CONFIG_PGTABLE_LEVELS > 3 */ 654 655 #endif /* __ASSEMBLY__ */ 656 657 /* 658 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD] 659 * 660 * this macro returns the index of the entry in the pgd page which would 661 * control the given virtual address 662 */ 663 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) 664 665 /* 666 * pgd_offset() returns a (pgd_t *) 667 * pgd_index() is used get the offset into the pgd page's array of pgd_t's; 668 */ 669 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address))) 670 /* 671 * a shortcut which implies the use of the kernel's pgd, instead 672 * of a process's 673 */ 674 #define pgd_offset_k(address) pgd_offset(&init_mm, (address)) 675 676 677 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET) 678 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY) 679 680 #ifndef __ASSEMBLY__ 681 682 extern int direct_gbpages; 683 void init_mem_mapping(void); 684 void early_alloc_pgt_buf(void); 685 686 /* local pte updates need not use xchg for locking */ 687 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) 688 { 689 pte_t res = *ptep; 690 691 /* Pure native function needs no input for mm, addr */ 692 native_pte_clear(NULL, 0, ptep); 693 return res; 694 } 695 696 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp) 697 { 698 pmd_t res = *pmdp; 699 700 native_pmd_clear(pmdp); 701 return res; 702 } 703 704 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr, 705 pte_t *ptep , pte_t pte) 706 { 707 native_set_pte(ptep, pte); 708 } 709 710 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr, 711 pmd_t *pmdp , pmd_t pmd) 712 { 713 native_set_pmd(pmdp, pmd); 714 } 715 716 #ifndef CONFIG_PARAVIRT 717 /* 718 * Rules for using pte_update - it must be called after any PTE update which 719 * has not been done using the set_pte / clear_pte interfaces. It is used by 720 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE 721 * updates should either be sets, clears, or set_pte_atomic for P->P 722 * transitions, which means this hook should only be called for user PTEs. 723 * This hook implies a P->P protection or access change has taken place, which 724 * requires a subsequent TLB flush. The notification can optionally be delayed 725 * until the TLB flush event by using the pte_update_defer form of the 726 * interface, but care must be taken to assure that the flush happens while 727 * still holding the same page table lock so that the shadow and primary pages 728 * do not become out of sync on SMP. 729 */ 730 #define pte_update(mm, addr, ptep) do { } while (0) 731 #define pte_update_defer(mm, addr, ptep) do { } while (0) 732 #endif 733 734 /* 735 * We only update the dirty/accessed state if we set 736 * the dirty bit by hand in the kernel, since the hardware 737 * will do the accessed bit for us, and we don't want to 738 * race with other CPU's that might be updating the dirty 739 * bit at the same time. 740 */ 741 struct vm_area_struct; 742 743 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 744 extern int ptep_set_access_flags(struct vm_area_struct *vma, 745 unsigned long address, pte_t *ptep, 746 pte_t entry, int dirty); 747 748 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 749 extern int ptep_test_and_clear_young(struct vm_area_struct *vma, 750 unsigned long addr, pte_t *ptep); 751 752 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 753 extern int ptep_clear_flush_young(struct vm_area_struct *vma, 754 unsigned long address, pte_t *ptep); 755 756 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 757 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, 758 pte_t *ptep) 759 { 760 pte_t pte = native_ptep_get_and_clear(ptep); 761 pte_update(mm, addr, ptep); 762 return pte; 763 } 764 765 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL 766 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, 767 unsigned long addr, pte_t *ptep, 768 int full) 769 { 770 pte_t pte; 771 if (full) { 772 /* 773 * Full address destruction in progress; paravirt does not 774 * care about updates and native needs no locking 775 */ 776 pte = native_local_ptep_get_and_clear(ptep); 777 } else { 778 pte = ptep_get_and_clear(mm, addr, ptep); 779 } 780 return pte; 781 } 782 783 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 784 static inline void ptep_set_wrprotect(struct mm_struct *mm, 785 unsigned long addr, pte_t *ptep) 786 { 787 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte); 788 pte_update(mm, addr, ptep); 789 } 790 791 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0) 792 793 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot)) 794 795 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS 796 extern int pmdp_set_access_flags(struct vm_area_struct *vma, 797 unsigned long address, pmd_t *pmdp, 798 pmd_t entry, int dirty); 799 800 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG 801 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, 802 unsigned long addr, pmd_t *pmdp); 803 804 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH 805 extern int pmdp_clear_flush_young(struct vm_area_struct *vma, 806 unsigned long address, pmd_t *pmdp); 807 808 809 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH 810 extern void pmdp_splitting_flush(struct vm_area_struct *vma, 811 unsigned long addr, pmd_t *pmdp); 812 813 #define __HAVE_ARCH_PMD_WRITE 814 static inline int pmd_write(pmd_t pmd) 815 { 816 return pmd_flags(pmd) & _PAGE_RW; 817 } 818 819 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 820 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr, 821 pmd_t *pmdp) 822 { 823 pmd_t pmd = native_pmdp_get_and_clear(pmdp); 824 pmd_update(mm, addr, pmdp); 825 return pmd; 826 } 827 828 #define __HAVE_ARCH_PMDP_SET_WRPROTECT 829 static inline void pmdp_set_wrprotect(struct mm_struct *mm, 830 unsigned long addr, pmd_t *pmdp) 831 { 832 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp); 833 pmd_update(mm, addr, pmdp); 834 } 835 836 /* 837 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count); 838 * 839 * dst - pointer to pgd range anwhere on a pgd page 840 * src - "" 841 * count - the number of pgds to copy. 842 * 843 * dst and src can be on the same page, but the range must not overlap, 844 * and must not cross a page boundary. 845 */ 846 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count) 847 { 848 memcpy(dst, src, count * sizeof(pgd_t)); 849 } 850 851 #define PTE_SHIFT ilog2(PTRS_PER_PTE) 852 static inline int page_level_shift(enum pg_level level) 853 { 854 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT; 855 } 856 static inline unsigned long page_level_size(enum pg_level level) 857 { 858 return 1UL << page_level_shift(level); 859 } 860 static inline unsigned long page_level_mask(enum pg_level level) 861 { 862 return ~(page_level_size(level) - 1); 863 } 864 865 /* 866 * The x86 doesn't have any external MMU info: the kernel page 867 * tables contain all the necessary information. 868 */ 869 static inline void update_mmu_cache(struct vm_area_struct *vma, 870 unsigned long addr, pte_t *ptep) 871 { 872 } 873 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma, 874 unsigned long addr, pmd_t *pmd) 875 { 876 } 877 878 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 879 static inline pte_t pte_swp_mksoft_dirty(pte_t pte) 880 { 881 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY); 882 } 883 884 static inline int pte_swp_soft_dirty(pte_t pte) 885 { 886 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY; 887 } 888 889 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) 890 { 891 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY); 892 } 893 #endif 894 895 #include <asm-generic/pgtable.h> 896 #endif /* __ASSEMBLY__ */ 897 898 #endif /* _ASM_X86_PGTABLE_H */ 899