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);
24 * ZERO_PAGE is a global shared page that is always zero: used
25 * for zero-mapped memory areas etc..
27 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
29 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
31 extern spinlock_t pgd_lock;
32 extern struct list_head pgd_list;
34 extern struct mm_struct *pgd_page_get_mm(struct page *page);
36 #ifdef CONFIG_PARAVIRT
37 #include <asm/paravirt.h>
38 #else /* !CONFIG_PARAVIRT */
39 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
40 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
41 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
43 #define set_pte_atomic(ptep, pte) \
44 native_set_pte_atomic(ptep, pte)
46 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
48 #ifndef __PAGETABLE_PUD_FOLDED
49 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
50 #define pgd_clear(pgd) native_pgd_clear(pgd)
54 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
57 #ifndef __PAGETABLE_PMD_FOLDED
58 #define pud_clear(pud) native_pud_clear(pud)
61 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
62 #define pmd_clear(pmd) native_pmd_clear(pmd)
64 #define pte_update(mm, addr, ptep) do { } while (0)
65 #define pte_update_defer(mm, addr, ptep) do { } while (0)
66 #define pmd_update(mm, addr, ptep) do { } while (0)
67 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
69 #define pgd_val(x) native_pgd_val(x)
70 #define __pgd(x) native_make_pgd(x)
72 #ifndef __PAGETABLE_PUD_FOLDED
73 #define pud_val(x) native_pud_val(x)
74 #define __pud(x) native_make_pud(x)
77 #ifndef __PAGETABLE_PMD_FOLDED
78 #define pmd_val(x) native_pmd_val(x)
79 #define __pmd(x) native_make_pmd(x)
82 #define pte_val(x) native_pte_val(x)
83 #define __pte(x) native_make_pte(x)
85 #define arch_end_context_switch(prev) do {} while(0)
87 #endif /* CONFIG_PARAVIRT */
90 * The following only work if pte_present() is true.
91 * Undefined behaviour if not..
93 static inline int pte_dirty(pte_t pte)
95 return pte_flags(pte) & _PAGE_DIRTY;
98 static inline int pte_young(pte_t pte)
100 return pte_flags(pte) & _PAGE_ACCESSED;
103 static inline int pmd_dirty(pmd_t pmd)
105 return pmd_flags(pmd) & _PAGE_DIRTY;
108 static inline int pmd_young(pmd_t pmd)
110 return pmd_flags(pmd) & _PAGE_ACCESSED;
113 static inline int pte_write(pte_t pte)
115 return pte_flags(pte) & _PAGE_RW;
118 static inline int pte_file(pte_t pte)
120 return pte_flags(pte) & _PAGE_FILE;
123 static inline int pte_huge(pte_t pte)
125 return pte_flags(pte) & _PAGE_PSE;
128 static inline int pte_global(pte_t pte)
130 return pte_flags(pte) & _PAGE_GLOBAL;
133 static inline int pte_exec(pte_t pte)
135 return !(pte_flags(pte) & _PAGE_NX);
138 static inline int pte_special(pte_t pte)
141 * See CONFIG_NUMA_BALANCING pte_numa in include/asm-generic/pgtable.h.
142 * On x86 we have _PAGE_BIT_NUMA == _PAGE_BIT_GLOBAL+1 ==
143 * __PAGE_BIT_SOFTW1 == _PAGE_BIT_SPECIAL.
145 return (pte_flags(pte) & _PAGE_SPECIAL) &&
146 (pte_flags(pte) & (_PAGE_PRESENT|_PAGE_PROTNONE));
149 static inline unsigned long pte_pfn(pte_t pte)
151 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
154 static inline unsigned long pmd_pfn(pmd_t pmd)
156 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
159 static inline unsigned long pud_pfn(pud_t pud)
161 return (pud_val(pud) & PTE_PFN_MASK) >> PAGE_SHIFT;
164 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
166 static inline int pmd_large(pmd_t pte)
168 return pmd_flags(pte) & _PAGE_PSE;
171 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
172 static inline int pmd_trans_splitting(pmd_t pmd)
174 return pmd_val(pmd) & _PAGE_SPLITTING;
177 static inline int pmd_trans_huge(pmd_t pmd)
179 return pmd_val(pmd) & _PAGE_PSE;
182 static inline int has_transparent_hugepage(void)
186 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
188 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
190 pteval_t v = native_pte_val(pte);
192 return native_make_pte(v | set);
195 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
197 pteval_t v = native_pte_val(pte);
199 return native_make_pte(v & ~clear);
202 static inline pte_t pte_mkclean(pte_t pte)
204 return pte_clear_flags(pte, _PAGE_DIRTY);
207 static inline pte_t pte_mkold(pte_t pte)
209 return pte_clear_flags(pte, _PAGE_ACCESSED);
212 static inline pte_t pte_wrprotect(pte_t pte)
214 return pte_clear_flags(pte, _PAGE_RW);
217 static inline pte_t pte_mkexec(pte_t pte)
219 return pte_clear_flags(pte, _PAGE_NX);
222 static inline pte_t pte_mkdirty(pte_t pte)
224 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
227 static inline pte_t pte_mkyoung(pte_t pte)
229 return pte_set_flags(pte, _PAGE_ACCESSED);
232 static inline pte_t pte_mkwrite(pte_t pte)
234 return pte_set_flags(pte, _PAGE_RW);
237 static inline pte_t pte_mkhuge(pte_t pte)
239 return pte_set_flags(pte, _PAGE_PSE);
242 static inline pte_t pte_clrhuge(pte_t pte)
244 return pte_clear_flags(pte, _PAGE_PSE);
247 static inline pte_t pte_mkglobal(pte_t pte)
249 return pte_set_flags(pte, _PAGE_GLOBAL);
252 static inline pte_t pte_clrglobal(pte_t pte)
254 return pte_clear_flags(pte, _PAGE_GLOBAL);
257 static inline pte_t pte_mkspecial(pte_t pte)
259 return pte_set_flags(pte, _PAGE_SPECIAL);
262 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
264 pmdval_t v = native_pmd_val(pmd);
266 return __pmd(v | set);
269 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
271 pmdval_t v = native_pmd_val(pmd);
273 return __pmd(v & ~clear);
276 static inline pmd_t pmd_mkold(pmd_t pmd)
278 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
281 static inline pmd_t pmd_wrprotect(pmd_t pmd)
283 return pmd_clear_flags(pmd, _PAGE_RW);
286 static inline pmd_t pmd_mkdirty(pmd_t pmd)
288 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
291 static inline pmd_t pmd_mkhuge(pmd_t pmd)
293 return pmd_set_flags(pmd, _PAGE_PSE);
296 static inline pmd_t pmd_mkyoung(pmd_t pmd)
298 return pmd_set_flags(pmd, _PAGE_ACCESSED);
301 static inline pmd_t pmd_mkwrite(pmd_t pmd)
303 return pmd_set_flags(pmd, _PAGE_RW);
306 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
308 return pmd_clear_flags(pmd, _PAGE_PRESENT);
311 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
312 static inline int pte_soft_dirty(pte_t pte)
314 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
317 static inline int pmd_soft_dirty(pmd_t pmd)
319 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
322 static inline pte_t pte_mksoft_dirty(pte_t pte)
324 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
327 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
329 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
332 static inline pte_t pte_file_clear_soft_dirty(pte_t pte)
334 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
337 static inline pte_t pte_file_mksoft_dirty(pte_t pte)
339 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
342 static inline int pte_file_soft_dirty(pte_t pte)
344 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
347 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
350 * Mask out unsupported bits in a present pgprot. Non-present pgprots
351 * can use those bits for other purposes, so leave them be.
353 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
355 pgprotval_t protval = pgprot_val(pgprot);
357 if (protval & _PAGE_PRESENT)
358 protval &= __supported_pte_mask;
363 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
365 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
366 massage_pgprot(pgprot));
369 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
371 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
372 massage_pgprot(pgprot));
375 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
377 pteval_t val = pte_val(pte);
380 * Chop off the NX bit (if present), and add the NX portion of
381 * the newprot (if present):
383 val &= _PAGE_CHG_MASK;
384 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
389 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
391 pmdval_t val = pmd_val(pmd);
393 val &= _HPAGE_CHG_MASK;
394 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
399 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
400 #define pgprot_modify pgprot_modify
401 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
403 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
404 pgprotval_t addbits = pgprot_val(newprot);
405 return __pgprot(preservebits | addbits);
408 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
410 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
412 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
413 enum page_cache_mode pcm,
414 enum page_cache_mode new_pcm)
417 * PAT type is always WB for untracked ranges, so no need to check.
419 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
423 * Certain new memtypes are not allowed with certain
425 * - request is uncached, return cannot be write-back
426 * - request is write-combine, return cannot be write-back
428 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
429 new_pcm == _PAGE_CACHE_MODE_WB) ||
430 (pcm == _PAGE_CACHE_MODE_WC &&
431 new_pcm == _PAGE_CACHE_MODE_WB)) {
438 pmd_t *populate_extra_pmd(unsigned long vaddr);
439 pte_t *populate_extra_pte(unsigned long vaddr);
440 #endif /* __ASSEMBLY__ */
443 # include <asm/pgtable_32.h>
445 # include <asm/pgtable_64.h>
449 #include <linux/mm_types.h>
450 #include <linux/mmdebug.h>
451 #include <linux/log2.h>
453 static inline int pte_none(pte_t pte)
458 #define __HAVE_ARCH_PTE_SAME
459 static inline int pte_same(pte_t a, pte_t b)
461 return a.pte == b.pte;
464 static inline int pte_present(pte_t a)
466 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE |
470 #define pte_present_nonuma pte_present_nonuma
471 static inline int pte_present_nonuma(pte_t a)
473 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
476 #define pte_accessible pte_accessible
477 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
479 if (pte_flags(a) & _PAGE_PRESENT)
482 if ((pte_flags(a) & (_PAGE_PROTNONE | _PAGE_NUMA)) &&
483 mm_tlb_flush_pending(mm))
489 static inline int pte_hidden(pte_t pte)
491 return pte_flags(pte) & _PAGE_HIDDEN;
494 static inline int pmd_present(pmd_t pmd)
497 * Checking for _PAGE_PSE is needed too because
498 * split_huge_page will temporarily clear the present bit (but
499 * the _PAGE_PSE flag will remain set at all times while the
500 * _PAGE_PRESENT bit is clear).
502 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE |
506 static inline int pmd_none(pmd_t pmd)
508 /* Only check low word on 32-bit platforms, since it might be
509 out of sync with upper half. */
510 return (unsigned long)native_pmd_val(pmd) == 0;
513 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
515 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
519 * Currently stuck as a macro due to indirect forward reference to
520 * linux/mmzone.h's __section_mem_map_addr() definition:
522 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> 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 #ifdef CONFIG_NUMA_BALANCING
564 if ((pmd_flags(pmd) & (_PAGE_NUMA|_PAGE_PRESENT)) == _PAGE_NUMA)
567 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
570 static inline unsigned long pages_to_mb(unsigned long npg)
572 return npg >> (20 - PAGE_SHIFT);
575 #if PAGETABLE_LEVELS > 2
576 static inline int pud_none(pud_t pud)
578 return native_pud_val(pud) == 0;
581 static inline int pud_present(pud_t pud)
583 return pud_flags(pud) & _PAGE_PRESENT;
586 static inline unsigned long pud_page_vaddr(pud_t pud)
588 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
592 * Currently stuck as a macro due to indirect forward reference to
593 * linux/mmzone.h's __section_mem_map_addr() definition:
595 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
597 /* Find an entry in the second-level page table.. */
598 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
600 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
603 static inline int pud_large(pud_t pud)
605 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
606 (_PAGE_PSE | _PAGE_PRESENT);
609 static inline int pud_bad(pud_t pud)
611 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
614 static inline int pud_large(pud_t pud)
618 #endif /* PAGETABLE_LEVELS > 2 */
620 #if PAGETABLE_LEVELS > 3
621 static inline int pgd_present(pgd_t pgd)
623 return pgd_flags(pgd) & _PAGE_PRESENT;
626 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
628 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
632 * Currently stuck as a macro due to indirect forward reference to
633 * linux/mmzone.h's __section_mem_map_addr() definition:
635 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
637 /* to find an entry in a page-table-directory. */
638 static inline unsigned long pud_index(unsigned long address)
640 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
643 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
645 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
648 static inline int pgd_bad(pgd_t pgd)
650 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
653 static inline int pgd_none(pgd_t pgd)
655 return !native_pgd_val(pgd);
657 #endif /* PAGETABLE_LEVELS > 3 */
659 #endif /* __ASSEMBLY__ */
662 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
664 * this macro returns the index of the entry in the pgd page which would
665 * control the given virtual address
667 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
670 * pgd_offset() returns a (pgd_t *)
671 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
673 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
675 * a shortcut which implies the use of the kernel's pgd, instead
678 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
681 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
682 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
686 extern int direct_gbpages;
687 void init_mem_mapping(void);
688 void early_alloc_pgt_buf(void);
690 /* local pte updates need not use xchg for locking */
691 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
695 /* Pure native function needs no input for mm, addr */
696 native_pte_clear(NULL, 0, ptep);
700 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
704 native_pmd_clear(pmdp);
708 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
709 pte_t *ptep , pte_t pte)
711 native_set_pte(ptep, pte);
714 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
715 pmd_t *pmdp , pmd_t pmd)
717 native_set_pmd(pmdp, pmd);
720 #ifndef CONFIG_PARAVIRT
722 * Rules for using pte_update - it must be called after any PTE update which
723 * has not been done using the set_pte / clear_pte interfaces. It is used by
724 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
725 * updates should either be sets, clears, or set_pte_atomic for P->P
726 * transitions, which means this hook should only be called for user PTEs.
727 * This hook implies a P->P protection or access change has taken place, which
728 * requires a subsequent TLB flush. The notification can optionally be delayed
729 * until the TLB flush event by using the pte_update_defer form of the
730 * interface, but care must be taken to assure that the flush happens while
731 * still holding the same page table lock so that the shadow and primary pages
732 * do not become out of sync on SMP.
734 #define pte_update(mm, addr, ptep) do { } while (0)
735 #define pte_update_defer(mm, addr, ptep) do { } while (0)
739 * We only update the dirty/accessed state if we set
740 * the dirty bit by hand in the kernel, since the hardware
741 * will do the accessed bit for us, and we don't want to
742 * race with other CPU's that might be updating the dirty
743 * bit at the same time.
745 struct vm_area_struct;
747 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
748 extern int ptep_set_access_flags(struct vm_area_struct *vma,
749 unsigned long address, pte_t *ptep,
750 pte_t entry, int dirty);
752 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
753 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
754 unsigned long addr, pte_t *ptep);
756 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
757 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
758 unsigned long address, pte_t *ptep);
760 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
761 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
764 pte_t pte = native_ptep_get_and_clear(ptep);
765 pte_update(mm, addr, ptep);
769 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
770 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
771 unsigned long addr, pte_t *ptep,
777 * Full address destruction in progress; paravirt does not
778 * care about updates and native needs no locking
780 pte = native_local_ptep_get_and_clear(ptep);
782 pte = ptep_get_and_clear(mm, addr, ptep);
787 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
788 static inline void ptep_set_wrprotect(struct mm_struct *mm,
789 unsigned long addr, pte_t *ptep)
791 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
792 pte_update(mm, addr, ptep);
795 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
797 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
799 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
800 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
801 unsigned long address, pmd_t *pmdp,
802 pmd_t entry, int dirty);
804 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
805 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
806 unsigned long addr, pmd_t *pmdp);
808 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
809 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
810 unsigned long address, pmd_t *pmdp);
813 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
814 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
815 unsigned long addr, pmd_t *pmdp);
817 #define __HAVE_ARCH_PMD_WRITE
818 static inline int pmd_write(pmd_t pmd)
820 return pmd_flags(pmd) & _PAGE_RW;
823 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
824 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
827 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
828 pmd_update(mm, addr, pmdp);
832 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
833 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
834 unsigned long addr, pmd_t *pmdp)
836 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
837 pmd_update(mm, addr, pmdp);
841 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
843 * dst - pointer to pgd range anwhere on a pgd page
845 * count - the number of pgds to copy.
847 * dst and src can be on the same page, but the range must not overlap,
848 * and must not cross a page boundary.
850 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
852 memcpy(dst, src, count * sizeof(pgd_t));
855 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
856 static inline int page_level_shift(enum pg_level level)
858 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
860 static inline unsigned long page_level_size(enum pg_level level)
862 return 1UL << page_level_shift(level);
864 static inline unsigned long page_level_mask(enum pg_level level)
866 return ~(page_level_size(level) - 1);
870 * The x86 doesn't have any external MMU info: the kernel page
871 * tables contain all the necessary information.
873 static inline void update_mmu_cache(struct vm_area_struct *vma,
874 unsigned long addr, pte_t *ptep)
877 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
878 unsigned long addr, pmd_t *pmd)
882 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
883 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
885 VM_BUG_ON(pte_present_nonuma(pte));
886 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
889 static inline int pte_swp_soft_dirty(pte_t pte)
891 VM_BUG_ON(pte_present_nonuma(pte));
892 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
895 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
897 VM_BUG_ON(pte_present_nonuma(pte));
898 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
902 #include <asm-generic/pgtable.h>
903 #endif /* __ASSEMBLY__ */
905 #endif /* _ASM_X86_PGTABLE_H */