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_huge(pte_t pte)
120 return pte_flags(pte) & _PAGE_PSE;
123 static inline int pte_global(pte_t pte)
125 return pte_flags(pte) & _PAGE_GLOBAL;
128 static inline int pte_exec(pte_t pte)
130 return !(pte_flags(pte) & _PAGE_NX);
133 static inline int pte_special(pte_t pte)
135 return pte_flags(pte) & _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 | _PAGE_PROTNONE);
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_clear_soft_dirty(pte_t pte)
323 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
326 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
328 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
331 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
334 * Mask out unsupported bits in a present pgprot. Non-present pgprots
335 * can use those bits for other purposes, so leave them be.
337 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
339 pgprotval_t protval = pgprot_val(pgprot);
341 if (protval & _PAGE_PRESENT)
342 protval &= __supported_pte_mask;
347 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
349 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
350 massage_pgprot(pgprot));
353 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
355 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
356 massage_pgprot(pgprot));
359 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
361 pteval_t val = pte_val(pte);
364 * Chop off the NX bit (if present), and add the NX portion of
365 * the newprot (if present):
367 val &= _PAGE_CHG_MASK;
368 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
373 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
375 pmdval_t val = pmd_val(pmd);
377 val &= _HPAGE_CHG_MASK;
378 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
383 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
384 #define pgprot_modify pgprot_modify
385 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
387 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
388 pgprotval_t addbits = pgprot_val(newprot);
389 return __pgprot(preservebits | addbits);
392 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
394 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
396 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
397 enum page_cache_mode pcm,
398 enum page_cache_mode new_pcm)
401 * PAT type is always WB for untracked ranges, so no need to check.
403 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
407 * Certain new memtypes are not allowed with certain
409 * - request is uncached, return cannot be write-back
410 * - request is write-combine, return cannot be write-back
411 * - request is write-through, return cannot be write-back
412 * - request is write-through, return cannot be write-combine
414 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
415 new_pcm == _PAGE_CACHE_MODE_WB) ||
416 (pcm == _PAGE_CACHE_MODE_WC &&
417 new_pcm == _PAGE_CACHE_MODE_WB) ||
418 (pcm == _PAGE_CACHE_MODE_WT &&
419 new_pcm == _PAGE_CACHE_MODE_WB) ||
420 (pcm == _PAGE_CACHE_MODE_WT &&
421 new_pcm == _PAGE_CACHE_MODE_WC)) {
428 pmd_t *populate_extra_pmd(unsigned long vaddr);
429 pte_t *populate_extra_pte(unsigned long vaddr);
430 #endif /* __ASSEMBLY__ */
433 # include <asm/pgtable_32.h>
435 # include <asm/pgtable_64.h>
439 #include <linux/mm_types.h>
440 #include <linux/mmdebug.h>
441 #include <linux/log2.h>
443 static inline int pte_none(pte_t pte)
448 #define __HAVE_ARCH_PTE_SAME
449 static inline int pte_same(pte_t a, pte_t b)
451 return a.pte == b.pte;
454 static inline int pte_present(pte_t a)
456 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
459 #define pte_accessible pte_accessible
460 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
462 if (pte_flags(a) & _PAGE_PRESENT)
465 if ((pte_flags(a) & _PAGE_PROTNONE) &&
466 mm_tlb_flush_pending(mm))
472 static inline int pte_hidden(pte_t pte)
474 return pte_flags(pte) & _PAGE_HIDDEN;
477 static inline int pmd_present(pmd_t pmd)
480 * Checking for _PAGE_PSE is needed too because
481 * split_huge_page will temporarily clear the present bit (but
482 * the _PAGE_PSE flag will remain set at all times while the
483 * _PAGE_PRESENT bit is clear).
485 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
488 #ifdef CONFIG_NUMA_BALANCING
490 * These work without NUMA balancing but the kernel does not care. See the
491 * comment in include/asm-generic/pgtable.h
493 static inline int pte_protnone(pte_t pte)
495 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
499 static inline int pmd_protnone(pmd_t pmd)
501 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
504 #endif /* CONFIG_NUMA_BALANCING */
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 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((unsigned long)pud_val(pud) & PTE_PFN_MASK);
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) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
592 /* Find an entry in the second-level page table.. */
593 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
595 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
598 static inline int pud_large(pud_t pud)
600 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
601 (_PAGE_PSE | _PAGE_PRESENT);
604 static inline int pud_bad(pud_t pud)
606 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
609 static inline int pud_large(pud_t pud)
613 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
615 #if CONFIG_PGTABLE_LEVELS > 3
616 static inline int pgd_present(pgd_t pgd)
618 return pgd_flags(pgd) & _PAGE_PRESENT;
621 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
623 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
627 * Currently stuck as a macro due to indirect forward reference to
628 * linux/mmzone.h's __section_mem_map_addr() definition:
630 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
632 /* to find an entry in a page-table-directory. */
633 static inline unsigned long pud_index(unsigned long address)
635 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
638 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
640 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
643 static inline int pgd_bad(pgd_t pgd)
645 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
648 static inline int pgd_none(pgd_t pgd)
650 return !native_pgd_val(pgd);
652 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
654 #endif /* __ASSEMBLY__ */
657 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
659 * this macro returns the index of the entry in the pgd page which would
660 * control the given virtual address
662 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
665 * pgd_offset() returns a (pgd_t *)
666 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
668 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
670 * a shortcut which implies the use of the kernel's pgd, instead
673 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
676 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
677 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
681 extern int direct_gbpages;
682 void init_mem_mapping(void);
683 void early_alloc_pgt_buf(void);
685 /* local pte updates need not use xchg for locking */
686 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
690 /* Pure native function needs no input for mm, addr */
691 native_pte_clear(NULL, 0, ptep);
695 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
699 native_pmd_clear(pmdp);
703 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
704 pte_t *ptep , pte_t pte)
706 native_set_pte(ptep, pte);
709 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
710 pmd_t *pmdp , pmd_t pmd)
712 native_set_pmd(pmdp, pmd);
715 #ifndef CONFIG_PARAVIRT
717 * Rules for using pte_update - it must be called after any PTE update which
718 * has not been done using the set_pte / clear_pte interfaces. It is used by
719 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
720 * updates should either be sets, clears, or set_pte_atomic for P->P
721 * transitions, which means this hook should only be called for user PTEs.
722 * This hook implies a P->P protection or access change has taken place, which
723 * requires a subsequent TLB flush. The notification can optionally be delayed
724 * until the TLB flush event by using the pte_update_defer form of the
725 * interface, but care must be taken to assure that the flush happens while
726 * still holding the same page table lock so that the shadow and primary pages
727 * do not become out of sync on SMP.
729 #define pte_update(mm, addr, ptep) do { } while (0)
730 #define pte_update_defer(mm, addr, ptep) do { } while (0)
734 * We only update the dirty/accessed state if we set
735 * the dirty bit by hand in the kernel, since the hardware
736 * will do the accessed bit for us, and we don't want to
737 * race with other CPU's that might be updating the dirty
738 * bit at the same time.
740 struct vm_area_struct;
742 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
743 extern int ptep_set_access_flags(struct vm_area_struct *vma,
744 unsigned long address, pte_t *ptep,
745 pte_t entry, int dirty);
747 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
748 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
749 unsigned long addr, pte_t *ptep);
751 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
752 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
753 unsigned long address, pte_t *ptep);
755 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
756 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
759 pte_t pte = native_ptep_get_and_clear(ptep);
760 pte_update(mm, addr, ptep);
764 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
765 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
766 unsigned long addr, pte_t *ptep,
772 * Full address destruction in progress; paravirt does not
773 * care about updates and native needs no locking
775 pte = native_local_ptep_get_and_clear(ptep);
777 pte = ptep_get_and_clear(mm, addr, ptep);
782 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
783 static inline void ptep_set_wrprotect(struct mm_struct *mm,
784 unsigned long addr, pte_t *ptep)
786 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
787 pte_update(mm, addr, ptep);
790 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
792 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
794 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
795 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
796 unsigned long address, pmd_t *pmdp,
797 pmd_t entry, int dirty);
799 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
800 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
801 unsigned long addr, pmd_t *pmdp);
803 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
804 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
805 unsigned long address, pmd_t *pmdp);
808 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
809 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
810 unsigned long addr, pmd_t *pmdp);
812 #define __HAVE_ARCH_PMD_WRITE
813 static inline int pmd_write(pmd_t pmd)
815 return pmd_flags(pmd) & _PAGE_RW;
818 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
819 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
822 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
823 pmd_update(mm, addr, pmdp);
827 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
828 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
829 unsigned long addr, pmd_t *pmdp)
831 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
832 pmd_update(mm, addr, pmdp);
836 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
838 * dst - pointer to pgd range anwhere on a pgd page
840 * count - the number of pgds to copy.
842 * dst and src can be on the same page, but the range must not overlap,
843 * and must not cross a page boundary.
845 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
847 memcpy(dst, src, count * sizeof(pgd_t));
850 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
851 static inline int page_level_shift(enum pg_level level)
853 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
855 static inline unsigned long page_level_size(enum pg_level level)
857 return 1UL << page_level_shift(level);
859 static inline unsigned long page_level_mask(enum pg_level level)
861 return ~(page_level_size(level) - 1);
865 * The x86 doesn't have any external MMU info: the kernel page
866 * tables contain all the necessary information.
868 static inline void update_mmu_cache(struct vm_area_struct *vma,
869 unsigned long addr, pte_t *ptep)
872 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
873 unsigned long addr, pmd_t *pmd)
877 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
878 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
880 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
883 static inline int pte_swp_soft_dirty(pte_t pte)
885 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
888 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
890 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
894 #include <asm-generic/pgtable.h>
895 #endif /* __ASSEMBLY__ */
897 #endif /* _ASM_X86_PGTABLE_H */