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) | _PAGE_CACHE_UC_MINUS)) \
18 #include <asm/x86_init.h>
20 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
23 * ZERO_PAGE is a global shared page that is always zero: used
24 * for zero-mapped memory areas etc..
26 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
28 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
30 extern spinlock_t pgd_lock;
31 extern struct list_head pgd_list;
33 extern struct mm_struct *pgd_page_get_mm(struct page *page);
35 #ifdef CONFIG_PARAVIRT
36 #include <asm/paravirt.h>
37 #else /* !CONFIG_PARAVIRT */
38 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
39 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
40 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
42 #define set_pte_atomic(ptep, pte) \
43 native_set_pte_atomic(ptep, pte)
45 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
47 #ifndef __PAGETABLE_PUD_FOLDED
48 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
49 #define pgd_clear(pgd) native_pgd_clear(pgd)
53 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
56 #ifndef __PAGETABLE_PMD_FOLDED
57 #define pud_clear(pud) native_pud_clear(pud)
60 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
61 #define pmd_clear(pmd) native_pmd_clear(pmd)
63 #define pte_update(mm, addr, ptep) do { } while (0)
64 #define pte_update_defer(mm, addr, ptep) do { } while (0)
65 #define pmd_update(mm, addr, ptep) do { } while (0)
66 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
68 #define pgd_val(x) native_pgd_val(x)
69 #define __pgd(x) native_make_pgd(x)
71 #ifndef __PAGETABLE_PUD_FOLDED
72 #define pud_val(x) native_pud_val(x)
73 #define __pud(x) native_make_pud(x)
76 #ifndef __PAGETABLE_PMD_FOLDED
77 #define pmd_val(x) native_pmd_val(x)
78 #define __pmd(x) native_make_pmd(x)
81 #define pte_val(x) native_pte_val(x)
82 #define __pte(x) native_make_pte(x)
84 #define arch_end_context_switch(prev) do {} while(0)
86 #endif /* CONFIG_PARAVIRT */
89 * The following only work if pte_present() is true.
90 * Undefined behaviour if not..
92 static inline int pte_dirty(pte_t pte)
94 return pte_flags(pte) & _PAGE_DIRTY;
97 static inline int pte_young(pte_t pte)
99 return pte_flags(pte) & _PAGE_ACCESSED;
102 static inline int pmd_young(pmd_t pmd)
104 return pmd_flags(pmd) & _PAGE_ACCESSED;
107 static inline int pte_write(pte_t pte)
109 return pte_flags(pte) & _PAGE_RW;
112 static inline int pte_file(pte_t pte)
114 return pte_flags(pte) & _PAGE_FILE;
117 static inline int pte_huge(pte_t pte)
119 return pte_flags(pte) & _PAGE_PSE;
122 static inline int pte_global(pte_t pte)
124 return pte_flags(pte) & _PAGE_GLOBAL;
127 static inline int pte_exec(pte_t pte)
129 return !(pte_flags(pte) & _PAGE_NX);
132 static inline int pte_special(pte_t pte)
134 return (pte_flags(pte) & (_PAGE_PRESENT|_PAGE_SPECIAL)) ==
135 (_PAGE_PRESENT|_PAGE_SPECIAL);
138 static inline unsigned long pte_pfn(pte_t pte)
140 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
143 static inline unsigned long pmd_pfn(pmd_t pmd)
145 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
148 static inline unsigned long pud_pfn(pud_t pud)
150 return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;
153 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
155 static inline int pmd_large(pmd_t pte)
157 return pmd_flags(pte) & _PAGE_PSE;
160 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
161 static inline int pmd_trans_splitting(pmd_t pmd)
163 return pmd_val(pmd) & _PAGE_SPLITTING;
166 static inline int pmd_trans_huge(pmd_t pmd)
168 return pmd_val(pmd) & _PAGE_PSE;
171 static inline int has_transparent_hugepage(void)
175 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
177 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
179 pteval_t v = native_pte_val(pte);
181 return native_make_pte(v | set);
184 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
186 pteval_t v = native_pte_val(pte);
188 return native_make_pte(v & ~clear);
191 static inline pte_t pte_mkclean(pte_t pte)
193 return pte_clear_flags(pte, _PAGE_DIRTY);
196 static inline pte_t pte_mkold(pte_t pte)
198 return pte_clear_flags(pte, _PAGE_ACCESSED);
201 static inline pte_t pte_wrprotect(pte_t pte)
203 return pte_clear_flags(pte, _PAGE_RW);
206 static inline pte_t pte_mkexec(pte_t pte)
208 return pte_clear_flags(pte, _PAGE_NX);
211 static inline pte_t pte_mkdirty(pte_t pte)
213 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
216 static inline pte_t pte_mkyoung(pte_t pte)
218 return pte_set_flags(pte, _PAGE_ACCESSED);
221 static inline pte_t pte_mkwrite(pte_t pte)
223 return pte_set_flags(pte, _PAGE_RW);
226 static inline pte_t pte_mkhuge(pte_t pte)
228 return pte_set_flags(pte, _PAGE_PSE);
231 static inline pte_t pte_clrhuge(pte_t pte)
233 return pte_clear_flags(pte, _PAGE_PSE);
236 static inline pte_t pte_mkglobal(pte_t pte)
238 return pte_set_flags(pte, _PAGE_GLOBAL);
241 static inline pte_t pte_clrglobal(pte_t pte)
243 return pte_clear_flags(pte, _PAGE_GLOBAL);
246 static inline pte_t pte_mkspecial(pte_t pte)
248 return pte_set_flags(pte, _PAGE_SPECIAL);
251 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
253 pmdval_t v = native_pmd_val(pmd);
255 return __pmd(v | set);
258 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
260 pmdval_t v = native_pmd_val(pmd);
262 return __pmd(v & ~clear);
265 static inline pmd_t pmd_mkold(pmd_t pmd)
267 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
270 static inline pmd_t pmd_wrprotect(pmd_t pmd)
272 return pmd_clear_flags(pmd, _PAGE_RW);
275 static inline pmd_t pmd_mkdirty(pmd_t pmd)
277 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
280 static inline pmd_t pmd_mkhuge(pmd_t pmd)
282 return pmd_set_flags(pmd, _PAGE_PSE);
285 static inline pmd_t pmd_mkyoung(pmd_t pmd)
287 return pmd_set_flags(pmd, _PAGE_ACCESSED);
290 static inline pmd_t pmd_mkwrite(pmd_t pmd)
292 return pmd_set_flags(pmd, _PAGE_RW);
295 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
297 return pmd_clear_flags(pmd, _PAGE_PRESENT);
300 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
301 static inline int pte_soft_dirty(pte_t pte)
303 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
306 static inline int pmd_soft_dirty(pmd_t pmd)
308 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
311 static inline pte_t pte_mksoft_dirty(pte_t pte)
313 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
316 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
318 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
321 static inline pte_t pte_file_clear_soft_dirty(pte_t pte)
323 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
326 static inline pte_t pte_file_mksoft_dirty(pte_t pte)
328 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
331 static inline int pte_file_soft_dirty(pte_t pte)
333 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
336 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
339 * Mask out unsupported bits in a present pgprot. Non-present pgprots
340 * can use those bits for other purposes, so leave them be.
342 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
344 pgprotval_t protval = pgprot_val(pgprot);
346 if (protval & _PAGE_PRESENT)
347 protval &= __supported_pte_mask;
352 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
354 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
355 massage_pgprot(pgprot));
358 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
360 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
361 massage_pgprot(pgprot));
364 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
366 pteval_t val = pte_val(pte);
369 * Chop off the NX bit (if present), and add the NX portion of
370 * the newprot (if present):
372 val &= _PAGE_CHG_MASK;
373 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
378 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
380 pmdval_t val = pmd_val(pmd);
382 val &= _HPAGE_CHG_MASK;
383 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
388 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
389 #define pgprot_modify pgprot_modify
390 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
392 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
393 pgprotval_t addbits = pgprot_val(newprot);
394 return __pgprot(preservebits | addbits);
397 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
399 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
401 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
403 unsigned long new_flags)
406 * PAT type is always WB for untracked ranges, so no need to check.
408 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
412 * Certain new memtypes are not allowed with certain
414 * - request is uncached, return cannot be write-back
415 * - request is write-combine, return cannot be write-back
417 if ((flags == _PAGE_CACHE_UC_MINUS &&
418 new_flags == _PAGE_CACHE_WB) ||
419 (flags == _PAGE_CACHE_WC &&
420 new_flags == _PAGE_CACHE_WB)) {
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 |
459 #define pte_present_nonuma pte_present_nonuma
460 static inline int pte_present_nonuma(pte_t a)
462 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
465 #define pte_accessible pte_accessible
466 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
468 if (pte_flags(a) & _PAGE_PRESENT)
471 if ((pte_flags(a) & (_PAGE_PROTNONE | _PAGE_NUMA)) &&
472 mm_tlb_flush_pending(mm))
478 static inline int pte_hidden(pte_t pte)
480 return pte_flags(pte) & _PAGE_HIDDEN;
483 static inline int pmd_present(pmd_t pmd)
486 * Checking for _PAGE_PSE is needed too because
487 * split_huge_page will temporarily clear the present bit (but
488 * the _PAGE_PSE flag will remain set at all times while the
489 * _PAGE_PRESENT bit is clear).
491 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE |
495 static inline int pmd_none(pmd_t pmd)
497 /* Only check low word on 32-bit platforms, since it might be
498 out of sync with upper half. */
499 return (unsigned long)native_pmd_val(pmd) == 0;
502 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
504 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
508 * Currently stuck as a macro due to indirect forward reference to
509 * linux/mmzone.h's __section_mem_map_addr() definition:
511 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
514 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
516 * this macro returns the index of the entry in the pmd page which would
517 * control the given virtual address
519 static inline unsigned long pmd_index(unsigned long address)
521 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
525 * Conversion functions: convert a page and protection to a page entry,
526 * and a page entry and page directory to the page they refer to.
528 * (Currently stuck as a macro because of indirect forward reference
529 * to linux/mm.h:page_to_nid())
531 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
534 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
536 * this function returns the index of the entry in the pte page which would
537 * control the given virtual address
539 static inline unsigned long pte_index(unsigned long address)
541 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
544 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
546 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
549 static inline int pmd_bad(pmd_t pmd)
551 #ifdef CONFIG_NUMA_BALANCING
553 if ((pmd_flags(pmd) & (_PAGE_NUMA|_PAGE_PRESENT)) == _PAGE_NUMA)
556 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
559 static inline unsigned long pages_to_mb(unsigned long npg)
561 return npg >> (20 - PAGE_SHIFT);
564 #if PAGETABLE_LEVELS > 2
565 static inline int pud_none(pud_t pud)
567 return native_pud_val(pud) == 0;
570 static inline int pud_present(pud_t pud)
572 return pud_flags(pud) & _PAGE_PRESENT;
575 static inline unsigned long pud_page_vaddr(pud_t pud)
577 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
581 * Currently stuck as a macro due to indirect forward reference to
582 * linux/mmzone.h's __section_mem_map_addr() definition:
584 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
586 /* Find an entry in the second-level page table.. */
587 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
589 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
592 static inline int pud_large(pud_t pud)
594 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
595 (_PAGE_PSE | _PAGE_PRESENT);
598 static inline int pud_bad(pud_t pud)
600 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
603 static inline int pud_large(pud_t pud)
607 #endif /* PAGETABLE_LEVELS > 2 */
609 #if PAGETABLE_LEVELS > 3
610 static inline int pgd_present(pgd_t pgd)
612 return pgd_flags(pgd) & _PAGE_PRESENT;
615 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
617 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
621 * Currently stuck as a macro due to indirect forward reference to
622 * linux/mmzone.h's __section_mem_map_addr() definition:
624 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
626 /* to find an entry in a page-table-directory. */
627 static inline unsigned long pud_index(unsigned long address)
629 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
632 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
634 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
637 static inline int pgd_bad(pgd_t pgd)
639 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
642 static inline int pgd_none(pgd_t pgd)
644 return !native_pgd_val(pgd);
646 #endif /* PAGETABLE_LEVELS > 3 */
648 #endif /* __ASSEMBLY__ */
651 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
653 * this macro returns the index of the entry in the pgd page which would
654 * control the given virtual address
656 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
659 * pgd_offset() returns a (pgd_t *)
660 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
662 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
664 * a shortcut which implies the use of the kernel's pgd, instead
667 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
670 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
671 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
675 extern int direct_gbpages;
676 void init_mem_mapping(void);
677 void early_alloc_pgt_buf(void);
679 /* local pte updates need not use xchg for locking */
680 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
684 /* Pure native function needs no input for mm, addr */
685 native_pte_clear(NULL, 0, ptep);
689 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
693 native_pmd_clear(pmdp);
697 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
698 pte_t *ptep , pte_t pte)
700 native_set_pte(ptep, pte);
703 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
704 pmd_t *pmdp , pmd_t pmd)
706 native_set_pmd(pmdp, pmd);
709 #ifndef CONFIG_PARAVIRT
711 * Rules for using pte_update - it must be called after any PTE update which
712 * has not been done using the set_pte / clear_pte interfaces. It is used by
713 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
714 * updates should either be sets, clears, or set_pte_atomic for P->P
715 * transitions, which means this hook should only be called for user PTEs.
716 * This hook implies a P->P protection or access change has taken place, which
717 * requires a subsequent TLB flush. The notification can optionally be delayed
718 * until the TLB flush event by using the pte_update_defer form of the
719 * interface, but care must be taken to assure that the flush happens while
720 * still holding the same page table lock so that the shadow and primary pages
721 * do not become out of sync on SMP.
723 #define pte_update(mm, addr, ptep) do { } while (0)
724 #define pte_update_defer(mm, addr, ptep) do { } while (0)
728 * We only update the dirty/accessed state if we set
729 * the dirty bit by hand in the kernel, since the hardware
730 * will do the accessed bit for us, and we don't want to
731 * race with other CPU's that might be updating the dirty
732 * bit at the same time.
734 struct vm_area_struct;
736 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
737 extern int ptep_set_access_flags(struct vm_area_struct *vma,
738 unsigned long address, pte_t *ptep,
739 pte_t entry, int dirty);
741 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
742 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
743 unsigned long addr, pte_t *ptep);
745 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
746 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
747 unsigned long address, pte_t *ptep);
749 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
750 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
753 pte_t pte = native_ptep_get_and_clear(ptep);
754 pte_update(mm, addr, ptep);
758 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
759 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
760 unsigned long addr, pte_t *ptep,
766 * Full address destruction in progress; paravirt does not
767 * care about updates and native needs no locking
769 pte = native_local_ptep_get_and_clear(ptep);
771 pte = ptep_get_and_clear(mm, addr, ptep);
776 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
777 static inline void ptep_set_wrprotect(struct mm_struct *mm,
778 unsigned long addr, pte_t *ptep)
780 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
781 pte_update(mm, addr, ptep);
784 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
786 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
788 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
789 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
790 unsigned long address, pmd_t *pmdp,
791 pmd_t entry, int dirty);
793 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
794 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
795 unsigned long addr, pmd_t *pmdp);
797 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
798 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
799 unsigned long address, pmd_t *pmdp);
802 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
803 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
804 unsigned long addr, pmd_t *pmdp);
806 #define __HAVE_ARCH_PMD_WRITE
807 static inline int pmd_write(pmd_t pmd)
809 return pmd_flags(pmd) & _PAGE_RW;
812 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
813 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
816 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
817 pmd_update(mm, addr, pmdp);
821 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
822 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
823 unsigned long addr, pmd_t *pmdp)
825 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
826 pmd_update(mm, addr, pmdp);
830 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
832 * dst - pointer to pgd range anwhere on a pgd page
834 * count - the number of pgds to copy.
836 * dst and src can be on the same page, but the range must not overlap,
837 * and must not cross a page boundary.
839 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
841 memcpy(dst, src, count * sizeof(pgd_t));
844 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
845 static inline int page_level_shift(enum pg_level level)
847 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
849 static inline unsigned long page_level_size(enum pg_level level)
851 return 1UL << page_level_shift(level);
853 static inline unsigned long page_level_mask(enum pg_level level)
855 return ~(page_level_size(level) - 1);
859 * The x86 doesn't have any external MMU info: the kernel page
860 * tables contain all the necessary information.
862 static inline void update_mmu_cache(struct vm_area_struct *vma,
863 unsigned long addr, pte_t *ptep)
866 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
867 unsigned long addr, pmd_t *pmd)
871 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
872 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
874 VM_BUG_ON(pte_present_nonuma(pte));
875 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
878 static inline int pte_swp_soft_dirty(pte_t pte)
880 VM_BUG_ON(pte_present_nonuma(pte));
881 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
884 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
886 VM_BUG_ON(pte_present_nonuma(pte));
887 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
891 #include <asm-generic/pgtable.h>
892 #endif /* __ASSEMBLY__ */
894 #endif /* _ASM_X86_PGTABLE_H */