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)
73 #define pgd_val(x) native_pgd_val(x)
74 #define __pgd(x) native_make_pgd(x)
76 #ifndef __PAGETABLE_PUD_FOLDED
77 #define pud_val(x) native_pud_val(x)
78 #define __pud(x) native_make_pud(x)
81 #ifndef __PAGETABLE_PMD_FOLDED
82 #define pmd_val(x) native_pmd_val(x)
83 #define __pmd(x) native_make_pmd(x)
86 #define pte_val(x) native_pte_val(x)
87 #define __pte(x) native_make_pte(x)
89 #define arch_end_context_switch(prev) do {} while(0)
91 #endif /* CONFIG_PARAVIRT */
94 * The following only work if pte_present() is true.
95 * Undefined behaviour if not..
97 static inline int pte_dirty(pte_t pte)
99 return pte_flags(pte) & _PAGE_DIRTY;
103 static inline u32 read_pkru(void)
105 if (boot_cpu_has(X86_FEATURE_OSPKE))
106 return __read_pkru();
110 static inline void write_pkru(u32 pkru)
112 if (boot_cpu_has(X86_FEATURE_OSPKE))
116 static inline int pte_young(pte_t pte)
118 return pte_flags(pte) & _PAGE_ACCESSED;
121 static inline int pmd_dirty(pmd_t pmd)
123 return pmd_flags(pmd) & _PAGE_DIRTY;
126 static inline int pmd_young(pmd_t pmd)
128 return pmd_flags(pmd) & _PAGE_ACCESSED;
131 static inline int pte_write(pte_t pte)
133 return pte_flags(pte) & _PAGE_RW;
136 static inline int pte_huge(pte_t pte)
138 return pte_flags(pte) & _PAGE_PSE;
141 static inline int pte_global(pte_t pte)
143 return pte_flags(pte) & _PAGE_GLOBAL;
146 static inline int pte_exec(pte_t pte)
148 return !(pte_flags(pte) & _PAGE_NX);
151 static inline int pte_special(pte_t pte)
153 return pte_flags(pte) & _PAGE_SPECIAL;
156 static inline unsigned long pte_pfn(pte_t pte)
158 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
161 static inline unsigned long pmd_pfn(pmd_t pmd)
163 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
166 static inline unsigned long pud_pfn(pud_t pud)
168 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
171 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
173 static inline int pmd_large(pmd_t pte)
175 return pmd_flags(pte) & _PAGE_PSE;
178 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
179 static inline int pmd_trans_huge(pmd_t pmd)
181 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
184 #define has_transparent_hugepage has_transparent_hugepage
185 static inline int has_transparent_hugepage(void)
187 return boot_cpu_has(X86_FEATURE_PSE);
190 #ifdef __HAVE_ARCH_PTE_DEVMAP
191 static inline int pmd_devmap(pmd_t pmd)
193 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
196 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
198 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
200 pteval_t v = native_pte_val(pte);
202 return native_make_pte(v | set);
205 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
207 pteval_t v = native_pte_val(pte);
209 return native_make_pte(v & ~clear);
212 static inline pte_t pte_mkclean(pte_t pte)
214 return pte_clear_flags(pte, _PAGE_DIRTY);
217 static inline pte_t pte_mkold(pte_t pte)
219 return pte_clear_flags(pte, _PAGE_ACCESSED);
222 static inline pte_t pte_wrprotect(pte_t pte)
224 return pte_clear_flags(pte, _PAGE_RW);
227 static inline pte_t pte_mkexec(pte_t pte)
229 return pte_clear_flags(pte, _PAGE_NX);
232 static inline pte_t pte_mkdirty(pte_t pte)
234 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
237 static inline pte_t pte_mkyoung(pte_t pte)
239 return pte_set_flags(pte, _PAGE_ACCESSED);
242 static inline pte_t pte_mkwrite(pte_t pte)
244 return pte_set_flags(pte, _PAGE_RW);
247 static inline pte_t pte_mkhuge(pte_t pte)
249 return pte_set_flags(pte, _PAGE_PSE);
252 static inline pte_t pte_clrhuge(pte_t pte)
254 return pte_clear_flags(pte, _PAGE_PSE);
257 static inline pte_t pte_mkglobal(pte_t pte)
259 return pte_set_flags(pte, _PAGE_GLOBAL);
262 static inline pte_t pte_clrglobal(pte_t pte)
264 return pte_clear_flags(pte, _PAGE_GLOBAL);
267 static inline pte_t pte_mkspecial(pte_t pte)
269 return pte_set_flags(pte, _PAGE_SPECIAL);
272 static inline pte_t pte_mkdevmap(pte_t pte)
274 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
277 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
279 pmdval_t v = native_pmd_val(pmd);
281 return __pmd(v | set);
284 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
286 pmdval_t v = native_pmd_val(pmd);
288 return __pmd(v & ~clear);
291 static inline pmd_t pmd_mkold(pmd_t pmd)
293 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
296 static inline pmd_t pmd_mkclean(pmd_t pmd)
298 return pmd_clear_flags(pmd, _PAGE_DIRTY);
301 static inline pmd_t pmd_wrprotect(pmd_t pmd)
303 return pmd_clear_flags(pmd, _PAGE_RW);
306 static inline pmd_t pmd_mkdirty(pmd_t pmd)
308 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
311 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
313 return pmd_set_flags(pmd, _PAGE_DEVMAP);
316 static inline pmd_t pmd_mkhuge(pmd_t pmd)
318 return pmd_set_flags(pmd, _PAGE_PSE);
321 static inline pmd_t pmd_mkyoung(pmd_t pmd)
323 return pmd_set_flags(pmd, _PAGE_ACCESSED);
326 static inline pmd_t pmd_mkwrite(pmd_t pmd)
328 return pmd_set_flags(pmd, _PAGE_RW);
331 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
333 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
336 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
337 static inline int pte_soft_dirty(pte_t pte)
339 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
342 static inline int pmd_soft_dirty(pmd_t pmd)
344 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
347 static inline pte_t pte_mksoft_dirty(pte_t pte)
349 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
352 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
354 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
357 static inline pte_t pte_clear_soft_dirty(pte_t pte)
359 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
362 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
364 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
367 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
370 * Mask out unsupported bits in a present pgprot. Non-present pgprots
371 * can use those bits for other purposes, so leave them be.
373 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
375 pgprotval_t protval = pgprot_val(pgprot);
377 if (protval & _PAGE_PRESENT)
378 protval &= __supported_pte_mask;
383 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
385 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
386 massage_pgprot(pgprot));
389 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
391 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
392 massage_pgprot(pgprot));
395 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
397 pteval_t val = pte_val(pte);
400 * Chop off the NX bit (if present), and add the NX portion of
401 * the newprot (if present):
403 val &= _PAGE_CHG_MASK;
404 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
409 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
411 pmdval_t val = pmd_val(pmd);
413 val &= _HPAGE_CHG_MASK;
414 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
419 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
420 #define pgprot_modify pgprot_modify
421 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
423 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
424 pgprotval_t addbits = pgprot_val(newprot);
425 return __pgprot(preservebits | addbits);
428 #define pte_pgprot(x) __pgprot(pte_flags(x))
429 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
430 #define pud_pgprot(x) __pgprot(pud_flags(x))
432 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
434 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
435 enum page_cache_mode pcm,
436 enum page_cache_mode new_pcm)
439 * PAT type is always WB for untracked ranges, so no need to check.
441 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
445 * Certain new memtypes are not allowed with certain
447 * - request is uncached, return cannot be write-back
448 * - request is write-combine, return cannot be write-back
449 * - request is write-through, return cannot be write-back
450 * - request is write-through, return cannot be write-combine
452 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
453 new_pcm == _PAGE_CACHE_MODE_WB) ||
454 (pcm == _PAGE_CACHE_MODE_WC &&
455 new_pcm == _PAGE_CACHE_MODE_WB) ||
456 (pcm == _PAGE_CACHE_MODE_WT &&
457 new_pcm == _PAGE_CACHE_MODE_WB) ||
458 (pcm == _PAGE_CACHE_MODE_WT &&
459 new_pcm == _PAGE_CACHE_MODE_WC)) {
466 pmd_t *populate_extra_pmd(unsigned long vaddr);
467 pte_t *populate_extra_pte(unsigned long vaddr);
468 #endif /* __ASSEMBLY__ */
471 # include <asm/pgtable_32.h>
473 # include <asm/pgtable_64.h>
477 #include <linux/mm_types.h>
478 #include <linux/mmdebug.h>
479 #include <linux/log2.h>
481 static inline int pte_none(pte_t pte)
486 #define __HAVE_ARCH_PTE_SAME
487 static inline int pte_same(pte_t a, pte_t b)
489 return a.pte == b.pte;
492 static inline int pte_present(pte_t a)
494 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
497 #ifdef __HAVE_ARCH_PTE_DEVMAP
498 static inline int pte_devmap(pte_t a)
500 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
504 #define pte_accessible pte_accessible
505 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
507 if (pte_flags(a) & _PAGE_PRESENT)
510 if ((pte_flags(a) & _PAGE_PROTNONE) &&
511 mm_tlb_flush_pending(mm))
517 static inline int pte_hidden(pte_t pte)
519 return pte_flags(pte) & _PAGE_HIDDEN;
522 static inline int pmd_present(pmd_t pmd)
525 * Checking for _PAGE_PSE is needed too because
526 * split_huge_page will temporarily clear the present bit (but
527 * the _PAGE_PSE flag will remain set at all times while the
528 * _PAGE_PRESENT bit is clear).
530 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
533 #ifdef CONFIG_NUMA_BALANCING
535 * These work without NUMA balancing but the kernel does not care. See the
536 * comment in include/asm-generic/pgtable.h
538 static inline int pte_protnone(pte_t pte)
540 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
544 static inline int pmd_protnone(pmd_t pmd)
546 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
549 #endif /* CONFIG_NUMA_BALANCING */
551 static inline int pmd_none(pmd_t pmd)
553 /* Only check low word on 32-bit platforms, since it might be
554 out of sync with upper half. */
555 return (unsigned long)native_pmd_val(pmd) == 0;
558 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
560 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
564 * Currently stuck as a macro due to indirect forward reference to
565 * linux/mmzone.h's __section_mem_map_addr() definition:
567 #define pmd_page(pmd) \
568 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT)
571 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
573 * this macro returns the index of the entry in the pmd page which would
574 * control the given virtual address
576 static inline unsigned long pmd_index(unsigned long address)
578 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
582 * Conversion functions: convert a page and protection to a page entry,
583 * and a page entry and page directory to the page they refer to.
585 * (Currently stuck as a macro because of indirect forward reference
586 * to linux/mm.h:page_to_nid())
588 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
591 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
593 * this function returns the index of the entry in the pte page which would
594 * control the given virtual address
596 static inline unsigned long pte_index(unsigned long address)
598 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
601 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
603 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
606 static inline int pmd_bad(pmd_t pmd)
608 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
611 static inline unsigned long pages_to_mb(unsigned long npg)
613 return npg >> (20 - PAGE_SHIFT);
616 #if CONFIG_PGTABLE_LEVELS > 2
617 static inline int pud_none(pud_t pud)
619 return native_pud_val(pud) == 0;
622 static inline int pud_present(pud_t pud)
624 return pud_flags(pud) & _PAGE_PRESENT;
627 static inline unsigned long pud_page_vaddr(pud_t pud)
629 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
633 * Currently stuck as a macro due to indirect forward reference to
634 * linux/mmzone.h's __section_mem_map_addr() definition:
636 #define pud_page(pud) \
637 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT)
639 /* Find an entry in the second-level page table.. */
640 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
642 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
645 static inline int pud_large(pud_t pud)
647 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
648 (_PAGE_PSE | _PAGE_PRESENT);
651 static inline int pud_bad(pud_t pud)
653 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
656 static inline int pud_large(pud_t pud)
660 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
662 #if CONFIG_PGTABLE_LEVELS > 3
663 static inline int pgd_present(pgd_t pgd)
665 return pgd_flags(pgd) & _PAGE_PRESENT;
668 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
670 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
674 * Currently stuck as a macro due to indirect forward reference to
675 * linux/mmzone.h's __section_mem_map_addr() definition:
677 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
679 /* to find an entry in a page-table-directory. */
680 static inline unsigned long pud_index(unsigned long address)
682 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
685 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
687 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
690 static inline int pgd_bad(pgd_t pgd)
692 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
695 static inline int pgd_none(pgd_t pgd)
697 return !native_pgd_val(pgd);
699 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
701 #endif /* __ASSEMBLY__ */
704 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
706 * this macro returns the index of the entry in the pgd page which would
707 * control the given virtual address
709 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
712 * pgd_offset() returns a (pgd_t *)
713 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
715 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
717 * a shortcut which implies the use of the kernel's pgd, instead
720 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
723 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
724 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
728 extern int direct_gbpages;
729 void init_mem_mapping(void);
730 void early_alloc_pgt_buf(void);
732 /* local pte updates need not use xchg for locking */
733 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
737 /* Pure native function needs no input for mm, addr */
738 native_pte_clear(NULL, 0, ptep);
742 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
746 native_pmd_clear(pmdp);
750 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
751 pte_t *ptep , pte_t pte)
753 native_set_pte(ptep, pte);
756 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
757 pmd_t *pmdp , pmd_t pmd)
759 native_set_pmd(pmdp, pmd);
762 #ifndef CONFIG_PARAVIRT
764 * Rules for using pte_update - it must be called after any PTE update which
765 * has not been done using the set_pte / clear_pte interfaces. It is used by
766 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
767 * updates should either be sets, clears, or set_pte_atomic for P->P
768 * transitions, which means this hook should only be called for user PTEs.
769 * This hook implies a P->P protection or access change has taken place, which
770 * requires a subsequent TLB flush.
772 #define pte_update(mm, addr, ptep) do { } while (0)
776 * We only update the dirty/accessed state if we set
777 * the dirty bit by hand in the kernel, since the hardware
778 * will do the accessed bit for us, and we don't want to
779 * race with other CPU's that might be updating the dirty
780 * bit at the same time.
782 struct vm_area_struct;
784 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
785 extern int ptep_set_access_flags(struct vm_area_struct *vma,
786 unsigned long address, pte_t *ptep,
787 pte_t entry, int dirty);
789 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
790 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
791 unsigned long addr, pte_t *ptep);
793 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
794 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
795 unsigned long address, pte_t *ptep);
797 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
798 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
801 pte_t pte = native_ptep_get_and_clear(ptep);
802 pte_update(mm, addr, ptep);
806 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
807 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
808 unsigned long addr, pte_t *ptep,
814 * Full address destruction in progress; paravirt does not
815 * care about updates and native needs no locking
817 pte = native_local_ptep_get_and_clear(ptep);
819 pte = ptep_get_and_clear(mm, addr, ptep);
824 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
825 static inline void ptep_set_wrprotect(struct mm_struct *mm,
826 unsigned long addr, pte_t *ptep)
828 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
829 pte_update(mm, addr, ptep);
832 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
834 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
836 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
837 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
838 unsigned long address, pmd_t *pmdp,
839 pmd_t entry, int dirty);
841 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
842 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
843 unsigned long addr, pmd_t *pmdp);
845 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
846 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
847 unsigned long address, pmd_t *pmdp);
850 #define __HAVE_ARCH_PMD_WRITE
851 static inline int pmd_write(pmd_t pmd)
853 return pmd_flags(pmd) & _PAGE_RW;
856 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
857 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
860 return native_pmdp_get_and_clear(pmdp);
863 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
864 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
865 unsigned long addr, pmd_t *pmdp)
867 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
871 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
873 * dst - pointer to pgd range anwhere on a pgd page
875 * count - the number of pgds to copy.
877 * dst and src can be on the same page, but the range must not overlap,
878 * and must not cross a page boundary.
880 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
882 memcpy(dst, src, count * sizeof(pgd_t));
885 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
886 static inline int page_level_shift(enum pg_level level)
888 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
890 static inline unsigned long page_level_size(enum pg_level level)
892 return 1UL << page_level_shift(level);
894 static inline unsigned long page_level_mask(enum pg_level level)
896 return ~(page_level_size(level) - 1);
900 * The x86 doesn't have any external MMU info: the kernel page
901 * tables contain all the necessary information.
903 static inline void update_mmu_cache(struct vm_area_struct *vma,
904 unsigned long addr, pte_t *ptep)
907 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
908 unsigned long addr, pmd_t *pmd)
912 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
913 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
915 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
918 static inline int pte_swp_soft_dirty(pte_t pte)
920 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
923 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
925 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
929 #define PKRU_AD_BIT 0x1
930 #define PKRU_WD_BIT 0x2
931 #define PKRU_BITS_PER_PKEY 2
933 static inline bool __pkru_allows_read(u32 pkru, u16 pkey)
935 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
936 return !(pkru & (PKRU_AD_BIT << pkru_pkey_bits));
939 static inline bool __pkru_allows_write(u32 pkru, u16 pkey)
941 int pkru_pkey_bits = pkey * PKRU_BITS_PER_PKEY;
943 * Access-disable disables writes too so we need to check
946 return !(pkru & ((PKRU_AD_BIT|PKRU_WD_BIT) << pkru_pkey_bits));
949 static inline u16 pte_flags_pkey(unsigned long pte_flags)
951 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
952 /* ifdef to avoid doing 59-bit shift on 32-bit values */
953 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
959 #include <asm-generic/pgtable.h>
960 #endif /* __ASSEMBLY__ */
962 #endif /* _ASM_X86_PGTABLE_H */