1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
7 #include <asm/pgtable_types.h>
10 * Macro to mark a page protection value as UC-
12 #define pgprot_noncached(prot) \
13 ((boot_cpu_data.x86 > 3) \
14 ? (__pgprot(pgprot_val(prot) | \
15 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \
19 #include <asm/x86_init.h>
21 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
22 void ptdump_walk_pgd_level_checkwx(void);
24 #ifdef CONFIG_DEBUG_WX
25 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
27 #define debug_checkwx() do { } while (0)
31 * ZERO_PAGE is a global shared page that is always zero: used
32 * for zero-mapped memory areas etc..
34 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
36 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
38 extern spinlock_t pgd_lock;
39 extern struct list_head pgd_list;
41 extern struct mm_struct *pgd_page_get_mm(struct page *page);
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)
50 #define set_pte_atomic(ptep, pte) \
51 native_set_pte_atomic(ptep, pte)
53 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
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)
61 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
64 #ifndef __PAGETABLE_PMD_FOLDED
65 #define pud_clear(pud) native_pud_clear(pud)
68 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
69 #define pmd_clear(pmd) native_pmd_clear(pmd)
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)
76 #define pgd_val(x) native_pgd_val(x)
77 #define __pgd(x) native_make_pgd(x)
79 #ifndef __PAGETABLE_PUD_FOLDED
80 #define pud_val(x) native_pud_val(x)
81 #define __pud(x) native_make_pud(x)
84 #ifndef __PAGETABLE_PMD_FOLDED
85 #define pmd_val(x) native_pmd_val(x)
86 #define __pmd(x) native_make_pmd(x)
89 #define pte_val(x) native_pte_val(x)
90 #define __pte(x) native_make_pte(x)
92 #define arch_end_context_switch(prev) do {} while(0)
94 #endif /* CONFIG_PARAVIRT */
97 * The following only work if pte_present() is true.
98 * Undefined behaviour if not..
100 static inline int pte_dirty(pte_t pte)
102 return pte_flags(pte) & _PAGE_DIRTY;
105 static inline int pte_young(pte_t pte)
107 return pte_flags(pte) & _PAGE_ACCESSED;
110 static inline int pmd_dirty(pmd_t pmd)
112 return pmd_flags(pmd) & _PAGE_DIRTY;
115 static inline int pmd_young(pmd_t pmd)
117 return pmd_flags(pmd) & _PAGE_ACCESSED;
120 static inline int pte_write(pte_t pte)
122 return pte_flags(pte) & _PAGE_RW;
125 static inline int pte_huge(pte_t pte)
127 return pte_flags(pte) & _PAGE_PSE;
130 static inline int pte_global(pte_t pte)
132 return pte_flags(pte) & _PAGE_GLOBAL;
135 static inline int pte_exec(pte_t pte)
137 return !(pte_flags(pte) & _PAGE_NX);
140 static inline int pte_special(pte_t pte)
142 return pte_flags(pte) & _PAGE_SPECIAL;
145 static inline unsigned long pte_pfn(pte_t pte)
147 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
150 static inline unsigned long pmd_pfn(pmd_t pmd)
152 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
155 static inline unsigned long pud_pfn(pud_t pud)
157 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
160 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
162 static inline int pmd_large(pmd_t pte)
164 return pmd_flags(pte) & _PAGE_PSE;
167 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
168 static inline int pmd_trans_splitting(pmd_t pmd)
170 return pmd_val(pmd) & _PAGE_SPLITTING;
173 static inline int pmd_trans_huge(pmd_t pmd)
175 return pmd_val(pmd) & _PAGE_PSE;
178 static inline int has_transparent_hugepage(void)
182 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
184 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
186 pteval_t v = native_pte_val(pte);
188 return native_make_pte(v | set);
191 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
193 pteval_t v = native_pte_val(pte);
195 return native_make_pte(v & ~clear);
198 static inline pte_t pte_mkclean(pte_t pte)
200 return pte_clear_flags(pte, _PAGE_DIRTY);
203 static inline pte_t pte_mkold(pte_t pte)
205 return pte_clear_flags(pte, _PAGE_ACCESSED);
208 static inline pte_t pte_wrprotect(pte_t pte)
210 return pte_clear_flags(pte, _PAGE_RW);
213 static inline pte_t pte_mkexec(pte_t pte)
215 return pte_clear_flags(pte, _PAGE_NX);
218 static inline pte_t pte_mkdirty(pte_t pte)
220 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
223 static inline pte_t pte_mkyoung(pte_t pte)
225 return pte_set_flags(pte, _PAGE_ACCESSED);
228 static inline pte_t pte_mkwrite(pte_t pte)
230 return pte_set_flags(pte, _PAGE_RW);
233 static inline pte_t pte_mkhuge(pte_t pte)
235 return pte_set_flags(pte, _PAGE_PSE);
238 static inline pte_t pte_clrhuge(pte_t pte)
240 return pte_clear_flags(pte, _PAGE_PSE);
243 static inline pte_t pte_mkglobal(pte_t pte)
245 return pte_set_flags(pte, _PAGE_GLOBAL);
248 static inline pte_t pte_clrglobal(pte_t pte)
250 return pte_clear_flags(pte, _PAGE_GLOBAL);
253 static inline pte_t pte_mkspecial(pte_t pte)
255 return pte_set_flags(pte, _PAGE_SPECIAL);
258 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
260 pmdval_t v = native_pmd_val(pmd);
262 return __pmd(v | set);
265 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
267 pmdval_t v = native_pmd_val(pmd);
269 return __pmd(v & ~clear);
272 static inline pmd_t pmd_mkold(pmd_t pmd)
274 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
277 static inline pmd_t pmd_wrprotect(pmd_t pmd)
279 return pmd_clear_flags(pmd, _PAGE_RW);
282 static inline pmd_t pmd_mkdirty(pmd_t pmd)
284 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
287 static inline pmd_t pmd_mkhuge(pmd_t pmd)
289 return pmd_set_flags(pmd, _PAGE_PSE);
292 static inline pmd_t pmd_mkyoung(pmd_t pmd)
294 return pmd_set_flags(pmd, _PAGE_ACCESSED);
297 static inline pmd_t pmd_mkwrite(pmd_t pmd)
299 return pmd_set_flags(pmd, _PAGE_RW);
302 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
304 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
307 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
308 static inline int pte_soft_dirty(pte_t pte)
310 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
313 static inline int pmd_soft_dirty(pmd_t pmd)
315 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
318 static inline pte_t pte_mksoft_dirty(pte_t pte)
320 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
323 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
325 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
328 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
331 * Mask out unsupported bits in a present pgprot. Non-present pgprots
332 * can use those bits for other purposes, so leave them be.
334 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
336 pgprotval_t protval = pgprot_val(pgprot);
338 if (protval & _PAGE_PRESENT)
339 protval &= __supported_pte_mask;
344 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
346 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
347 massage_pgprot(pgprot));
350 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
352 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
353 massage_pgprot(pgprot));
356 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
358 pteval_t val = pte_val(pte);
361 * Chop off the NX bit (if present), and add the NX portion of
362 * the newprot (if present):
364 val &= _PAGE_CHG_MASK;
365 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
370 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
372 pmdval_t val = pmd_val(pmd);
374 val &= _HPAGE_CHG_MASK;
375 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
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)
384 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
385 pgprotval_t addbits = pgprot_val(newprot);
386 return __pgprot(preservebits | addbits);
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))
393 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
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)
400 * PAT type is always WB for untracked ranges, so no need to check.
402 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
406 * Certain new memtypes are not allowed with certain
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
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)) {
427 pmd_t *populate_extra_pmd(unsigned long vaddr);
428 pte_t *populate_extra_pte(unsigned long vaddr);
429 #endif /* __ASSEMBLY__ */
432 # include <asm/pgtable_32.h>
434 # include <asm/pgtable_64.h>
438 #include <linux/mm_types.h>
439 #include <linux/mmdebug.h>
440 #include <linux/log2.h>
442 static inline int pte_none(pte_t pte)
447 #define __HAVE_ARCH_PTE_SAME
448 static inline int pte_same(pte_t a, pte_t b)
450 return a.pte == b.pte;
453 static inline int pte_present(pte_t a)
455 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
458 #define pte_accessible pte_accessible
459 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
461 if (pte_flags(a) & _PAGE_PRESENT)
464 if ((pte_flags(a) & _PAGE_PROTNONE) &&
465 mm_tlb_flush_pending(mm))
471 static inline int pte_hidden(pte_t pte)
473 return pte_flags(pte) & _PAGE_HIDDEN;
476 static inline int pmd_present(pmd_t pmd)
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).
484 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
487 #ifdef CONFIG_NUMA_BALANCING
489 * These work without NUMA balancing but the kernel does not care. See the
490 * comment in include/asm-generic/pgtable.h
492 static inline int pte_protnone(pte_t pte)
494 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
498 static inline int pmd_protnone(pmd_t pmd)
500 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
503 #endif /* CONFIG_NUMA_BALANCING */
505 static inline int pmd_none(pmd_t pmd)
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;
512 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
514 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
518 * Currently stuck as a macro due to indirect forward reference to
519 * linux/mmzone.h's __section_mem_map_addr() definition:
521 #define pmd_page(pmd) \
522 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT)
525 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
527 * this macro returns the index of the entry in the pmd page which would
528 * control the given virtual address
530 static inline unsigned long pmd_index(unsigned long address)
532 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
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.
539 * (Currently stuck as a macro because of indirect forward reference
540 * to linux/mm.h:page_to_nid())
542 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
545 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
547 * this function returns the index of the entry in the pte page which would
548 * control the given virtual address
550 static inline unsigned long pte_index(unsigned long address)
552 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
555 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
557 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
560 static inline int pmd_bad(pmd_t pmd)
562 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
565 static inline unsigned long pages_to_mb(unsigned long npg)
567 return npg >> (20 - PAGE_SHIFT);
570 #if CONFIG_PGTABLE_LEVELS > 2
571 static inline int pud_none(pud_t pud)
573 return native_pud_val(pud) == 0;
576 static inline int pud_present(pud_t pud)
578 return pud_flags(pud) & _PAGE_PRESENT;
581 static inline unsigned long pud_page_vaddr(pud_t pud)
583 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
587 * Currently stuck as a macro due to indirect forward reference to
588 * linux/mmzone.h's __section_mem_map_addr() definition:
590 #define pud_page(pud) \
591 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT)
593 /* Find an entry in the second-level page table.. */
594 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
596 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
599 static inline int pud_large(pud_t pud)
601 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
602 (_PAGE_PSE | _PAGE_PRESENT);
605 static inline int pud_bad(pud_t pud)
607 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
610 static inline int pud_large(pud_t pud)
614 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
616 #if CONFIG_PGTABLE_LEVELS > 3
617 static inline int pgd_present(pgd_t pgd)
619 return pgd_flags(pgd) & _PAGE_PRESENT;
622 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
624 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
628 * Currently stuck as a macro due to indirect forward reference to
629 * linux/mmzone.h's __section_mem_map_addr() definition:
631 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
633 /* to find an entry in a page-table-directory. */
634 static inline unsigned long pud_index(unsigned long address)
636 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
639 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
641 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
644 static inline int pgd_bad(pgd_t pgd)
646 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
649 static inline int pgd_none(pgd_t pgd)
651 return !native_pgd_val(pgd);
653 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
655 #endif /* __ASSEMBLY__ */
658 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
660 * this macro returns the index of the entry in the pgd page which would
661 * control the given virtual address
663 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
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;
669 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
671 * a shortcut which implies the use of the kernel's pgd, instead
674 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
677 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
678 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
682 extern int direct_gbpages;
683 void init_mem_mapping(void);
684 void early_alloc_pgt_buf(void);
686 /* local pte updates need not use xchg for locking */
687 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
691 /* Pure native function needs no input for mm, addr */
692 native_pte_clear(NULL, 0, ptep);
696 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
700 native_pmd_clear(pmdp);
704 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
705 pte_t *ptep , pte_t pte)
707 native_set_pte(ptep, pte);
710 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
711 pmd_t *pmdp , pmd_t pmd)
713 native_set_pmd(pmdp, pmd);
716 #ifndef CONFIG_PARAVIRT
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.
730 #define pte_update(mm, addr, ptep) do { } while (0)
731 #define pte_update_defer(mm, addr, ptep) do { } while (0)
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.
741 struct vm_area_struct;
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);
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);
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);
756 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
757 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
760 pte_t pte = native_ptep_get_and_clear(ptep);
761 pte_update(mm, addr, ptep);
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,
773 * Full address destruction in progress; paravirt does not
774 * care about updates and native needs no locking
776 pte = native_local_ptep_get_and_clear(ptep);
778 pte = ptep_get_and_clear(mm, addr, ptep);
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)
787 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
788 pte_update(mm, addr, ptep);
791 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
793 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
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);
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);
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);
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);
813 #define __HAVE_ARCH_PMD_WRITE
814 static inline int pmd_write(pmd_t pmd)
816 return pmd_flags(pmd) & _PAGE_RW;
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,
823 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
824 pmd_update(mm, addr, pmdp);
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)
832 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
833 pmd_update(mm, addr, pmdp);
837 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
839 * dst - pointer to pgd range anwhere on a pgd page
841 * count - the number of pgds to copy.
843 * dst and src can be on the same page, but the range must not overlap,
844 * and must not cross a page boundary.
846 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
848 memcpy(dst, src, count * sizeof(pgd_t));
851 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
852 static inline int page_level_shift(enum pg_level level)
854 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
856 static inline unsigned long page_level_size(enum pg_level level)
858 return 1UL << page_level_shift(level);
860 static inline unsigned long page_level_mask(enum pg_level level)
862 return ~(page_level_size(level) - 1);
866 * The x86 doesn't have any external MMU info: the kernel page
867 * tables contain all the necessary information.
869 static inline void update_mmu_cache(struct vm_area_struct *vma,
870 unsigned long addr, pte_t *ptep)
873 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
874 unsigned long addr, pmd_t *pmd)
878 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
879 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
881 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
884 static inline int pte_swp_soft_dirty(pte_t pte)
886 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
889 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
891 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
895 #include <asm-generic/pgtable.h>
896 #endif /* __ASSEMBLY__ */
898 #endif /* _ASM_X86_PGTABLE_H */