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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)) \
19 #include <asm/x86_init.h>
22 * ZERO_PAGE is a global shared page that is always zero: used
23 * for zero-mapped memory areas etc..
25 extern unsigned long empty_zero_page
[PAGE_SIZE
/ sizeof(unsigned long)]
27 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
29 extern spinlock_t pgd_lock
;
30 extern struct list_head pgd_list
;
32 extern struct mm_struct
*pgd_page_get_mm(struct page
*page
);
34 #ifdef CONFIG_PARAVIRT
35 #include <asm/paravirt.h>
36 #else /* !CONFIG_PARAVIRT */
37 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
38 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
39 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
41 #define set_pte_atomic(ptep, pte) \
42 native_set_pte_atomic(ptep, pte)
44 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
46 #ifndef __PAGETABLE_PUD_FOLDED
47 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
48 #define pgd_clear(pgd) native_pgd_clear(pgd)
52 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
55 #ifndef __PAGETABLE_PMD_FOLDED
56 #define pud_clear(pud) native_pud_clear(pud)
59 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
60 #define pmd_clear(pmd) native_pmd_clear(pmd)
62 #define pte_update(mm, addr, ptep) do { } while (0)
63 #define pte_update_defer(mm, addr, ptep) do { } while (0)
64 #define pmd_update(mm, addr, ptep) do { } while (0)
65 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
67 #define pgd_val(x) native_pgd_val(x)
68 #define __pgd(x) native_make_pgd(x)
70 #ifndef __PAGETABLE_PUD_FOLDED
71 #define pud_val(x) native_pud_val(x)
72 #define __pud(x) native_make_pud(x)
75 #ifndef __PAGETABLE_PMD_FOLDED
76 #define pmd_val(x) native_pmd_val(x)
77 #define __pmd(x) native_make_pmd(x)
80 #define pte_val(x) native_pte_val(x)
81 #define __pte(x) native_make_pte(x)
83 #define arch_end_context_switch(prev) do {} while(0)
85 #endif /* CONFIG_PARAVIRT */
88 * The following only work if pte_present() is true.
89 * Undefined behaviour if not..
91 static inline int pte_dirty(pte_t pte
)
93 return pte_flags(pte
) & _PAGE_DIRTY
;
96 static inline int pte_young(pte_t pte
)
98 return pte_flags(pte
) & _PAGE_ACCESSED
;
101 static inline int pmd_young(pmd_t pmd
)
103 return pmd_flags(pmd
) & _PAGE_ACCESSED
;
106 static inline int pte_write(pte_t pte
)
108 return pte_flags(pte
) & _PAGE_RW
;
111 static inline int pte_file(pte_t pte
)
113 return pte_flags(pte
) & _PAGE_FILE
;
116 static inline int pte_huge(pte_t pte
)
118 return pte_flags(pte
) & _PAGE_PSE
;
121 static inline int pte_global(pte_t pte
)
123 return pte_flags(pte
) & _PAGE_GLOBAL
;
126 static inline int pte_exec(pte_t pte
)
128 return !(pte_flags(pte
) & _PAGE_NX
);
131 static inline int pte_special(pte_t pte
)
133 return pte_flags(pte
) & _PAGE_SPECIAL
;
136 static inline unsigned long pte_pfn(pte_t pte
)
138 return (pte_val(pte
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
141 static inline unsigned long pmd_pfn(pmd_t pmd
)
143 return (pmd_val(pmd
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
146 static inline unsigned long pud_pfn(pud_t pud
)
148 return (pud_val(pud
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
151 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
153 static inline int pmd_large(pmd_t pte
)
155 return pmd_flags(pte
) & _PAGE_PSE
;
158 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
159 static inline int pmd_trans_splitting(pmd_t pmd
)
161 return pmd_val(pmd
) & _PAGE_SPLITTING
;
164 static inline int pmd_trans_huge(pmd_t pmd
)
166 return pmd_val(pmd
) & _PAGE_PSE
;
169 static inline int has_transparent_hugepage(void)
173 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
175 static inline pte_t
pte_set_flags(pte_t pte
, pteval_t set
)
177 pteval_t v
= native_pte_val(pte
);
179 return native_make_pte(v
| set
);
182 static inline pte_t
pte_clear_flags(pte_t pte
, pteval_t clear
)
184 pteval_t v
= native_pte_val(pte
);
186 return native_make_pte(v
& ~clear
);
189 static inline pte_t
pte_mkclean(pte_t pte
)
191 return pte_clear_flags(pte
, _PAGE_DIRTY
);
194 static inline pte_t
pte_mkold(pte_t pte
)
196 return pte_clear_flags(pte
, _PAGE_ACCESSED
);
199 static inline pte_t
pte_wrprotect(pte_t pte
)
201 return pte_clear_flags(pte
, _PAGE_RW
);
204 static inline pte_t
pte_mkexec(pte_t pte
)
206 return pte_clear_flags(pte
, _PAGE_NX
);
209 static inline pte_t
pte_mkdirty(pte_t pte
)
211 return pte_set_flags(pte
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
214 static inline pte_t
pte_mkyoung(pte_t pte
)
216 return pte_set_flags(pte
, _PAGE_ACCESSED
);
219 static inline pte_t
pte_mkwrite(pte_t pte
)
221 return pte_set_flags(pte
, _PAGE_RW
);
224 static inline pte_t
pte_mkhuge(pte_t pte
)
226 return pte_set_flags(pte
, _PAGE_PSE
);
229 static inline pte_t
pte_clrhuge(pte_t pte
)
231 return pte_clear_flags(pte
, _PAGE_PSE
);
234 static inline pte_t
pte_mkglobal(pte_t pte
)
236 return pte_set_flags(pte
, _PAGE_GLOBAL
);
239 static inline pte_t
pte_clrglobal(pte_t pte
)
241 return pte_clear_flags(pte
, _PAGE_GLOBAL
);
244 static inline pte_t
pte_mkspecial(pte_t pte
)
246 return pte_set_flags(pte
, _PAGE_SPECIAL
);
249 static inline pmd_t
pmd_set_flags(pmd_t pmd
, pmdval_t set
)
251 pmdval_t v
= native_pmd_val(pmd
);
253 return __pmd(v
| set
);
256 static inline pmd_t
pmd_clear_flags(pmd_t pmd
, pmdval_t clear
)
258 pmdval_t v
= native_pmd_val(pmd
);
260 return __pmd(v
& ~clear
);
263 static inline pmd_t
pmd_mkold(pmd_t pmd
)
265 return pmd_clear_flags(pmd
, _PAGE_ACCESSED
);
268 static inline pmd_t
pmd_wrprotect(pmd_t pmd
)
270 return pmd_clear_flags(pmd
, _PAGE_RW
);
273 static inline pmd_t
pmd_mkdirty(pmd_t pmd
)
275 return pmd_set_flags(pmd
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
278 static inline pmd_t
pmd_mkhuge(pmd_t pmd
)
280 return pmd_set_flags(pmd
, _PAGE_PSE
);
283 static inline pmd_t
pmd_mkyoung(pmd_t pmd
)
285 return pmd_set_flags(pmd
, _PAGE_ACCESSED
);
288 static inline pmd_t
pmd_mkwrite(pmd_t pmd
)
290 return pmd_set_flags(pmd
, _PAGE_RW
);
293 static inline pmd_t
pmd_mknotpresent(pmd_t pmd
)
295 return pmd_clear_flags(pmd
, _PAGE_PRESENT
);
298 static inline int pte_soft_dirty(pte_t pte
)
300 return pte_flags(pte
) & _PAGE_SOFT_DIRTY
;
303 static inline int pmd_soft_dirty(pmd_t pmd
)
305 return pmd_flags(pmd
) & _PAGE_SOFT_DIRTY
;
308 static inline pte_t
pte_mksoft_dirty(pte_t pte
)
310 return pte_set_flags(pte
, _PAGE_SOFT_DIRTY
);
313 static inline pmd_t
pmd_mksoft_dirty(pmd_t pmd
)
315 return pmd_set_flags(pmd
, _PAGE_SOFT_DIRTY
);
318 static inline pte_t
pte_swp_mksoft_dirty(pte_t pte
)
320 return pte_set_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
323 static inline int pte_swp_soft_dirty(pte_t pte
)
325 return pte_flags(pte
) & _PAGE_SWP_SOFT_DIRTY
;
328 static inline pte_t
pte_swp_clear_soft_dirty(pte_t pte
)
330 return pte_clear_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
333 static inline pte_t
pte_file_clear_soft_dirty(pte_t pte
)
335 return pte_clear_flags(pte
, _PAGE_SOFT_DIRTY
);
338 static inline pte_t
pte_file_mksoft_dirty(pte_t pte
)
340 return pte_set_flags(pte
, _PAGE_SOFT_DIRTY
);
343 static inline int pte_file_soft_dirty(pte_t pte
)
345 return pte_flags(pte
) & _PAGE_SOFT_DIRTY
;
349 * Mask out unsupported bits in a present pgprot. Non-present pgprots
350 * can use those bits for other purposes, so leave them be.
352 static inline pgprotval_t
massage_pgprot(pgprot_t pgprot
)
354 pgprotval_t protval
= pgprot_val(pgprot
);
356 if (protval
& _PAGE_PRESENT
)
357 protval
&= __supported_pte_mask
;
362 static inline pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
364 return __pte(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
365 massage_pgprot(pgprot
));
368 static inline pmd_t
pfn_pmd(unsigned long page_nr
, pgprot_t pgprot
)
370 return __pmd(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
371 massage_pgprot(pgprot
));
374 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
376 pteval_t val
= pte_val(pte
);
379 * Chop off the NX bit (if present), and add the NX portion of
380 * the newprot (if present):
382 val
&= _PAGE_CHG_MASK
;
383 val
|= massage_pgprot(newprot
) & ~_PAGE_CHG_MASK
;
388 static inline pmd_t
pmd_modify(pmd_t pmd
, pgprot_t newprot
)
390 pmdval_t val
= pmd_val(pmd
);
392 val
&= _HPAGE_CHG_MASK
;
393 val
|= massage_pgprot(newprot
) & ~_HPAGE_CHG_MASK
;
398 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
399 #define pgprot_modify pgprot_modify
400 static inline pgprot_t
pgprot_modify(pgprot_t oldprot
, pgprot_t newprot
)
402 pgprotval_t preservebits
= pgprot_val(oldprot
) & _PAGE_CHG_MASK
;
403 pgprotval_t addbits
= pgprot_val(newprot
);
404 return __pgprot(preservebits
| addbits
);
407 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
409 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
411 static inline int is_new_memtype_allowed(u64 paddr
, unsigned long size
,
413 unsigned long new_flags
)
416 * PAT type is always WB for untracked ranges, so no need to check.
418 if (x86_platform
.is_untracked_pat_range(paddr
, paddr
+ size
))
422 * Certain new memtypes are not allowed with certain
424 * - request is uncached, return cannot be write-back
425 * - request is write-combine, return cannot be write-back
427 if ((flags
== _PAGE_CACHE_UC_MINUS
&&
428 new_flags
== _PAGE_CACHE_WB
) ||
429 (flags
== _PAGE_CACHE_WC
&&
430 new_flags
== _PAGE_CACHE_WB
)) {
437 pmd_t
*populate_extra_pmd(unsigned long vaddr
);
438 pte_t
*populate_extra_pte(unsigned long vaddr
);
439 #endif /* __ASSEMBLY__ */
442 # include <asm/pgtable_32.h>
444 # include <asm/pgtable_64.h>
448 #include <linux/mm_types.h>
449 #include <linux/log2.h>
451 static inline int pte_none(pte_t pte
)
456 #define __HAVE_ARCH_PTE_SAME
457 static inline int pte_same(pte_t a
, pte_t b
)
459 return a
.pte
== b
.pte
;
462 static inline int pte_present(pte_t a
)
464 return pte_flags(a
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
|
468 #define pte_accessible pte_accessible
469 static inline int pte_accessible(pte_t a
)
471 return pte_flags(a
) & _PAGE_PRESENT
;
474 static inline int pte_hidden(pte_t pte
)
476 return pte_flags(pte
) & _PAGE_HIDDEN
;
479 static inline int pmd_present(pmd_t pmd
)
482 * Checking for _PAGE_PSE is needed too because
483 * split_huge_page will temporarily clear the present bit (but
484 * the _PAGE_PSE flag will remain set at all times while the
485 * _PAGE_PRESENT bit is clear).
487 return pmd_flags(pmd
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
| _PAGE_PSE
|
491 static inline int pmd_none(pmd_t pmd
)
493 /* Only check low word on 32-bit platforms, since it might be
494 out of sync with upper half. */
495 return (unsigned long)native_pmd_val(pmd
) == 0;
498 static inline unsigned long pmd_page_vaddr(pmd_t pmd
)
500 return (unsigned long)__va(pmd_val(pmd
) & PTE_PFN_MASK
);
504 * Currently stuck as a macro due to indirect forward reference to
505 * linux/mmzone.h's __section_mem_map_addr() definition:
507 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
510 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
512 * this macro returns the index of the entry in the pmd page which would
513 * control the given virtual address
515 static inline unsigned long pmd_index(unsigned long address
)
517 return (address
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1);
521 * Conversion functions: convert a page and protection to a page entry,
522 * and a page entry and page directory to the page they refer to.
524 * (Currently stuck as a macro because of indirect forward reference
525 * to linux/mm.h:page_to_nid())
527 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
530 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
532 * this function returns the index of the entry in the pte page which would
533 * control the given virtual address
535 static inline unsigned long pte_index(unsigned long address
)
537 return (address
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1);
540 static inline pte_t
*pte_offset_kernel(pmd_t
*pmd
, unsigned long address
)
542 return (pte_t
*)pmd_page_vaddr(*pmd
) + pte_index(address
);
545 static inline int pmd_bad(pmd_t pmd
)
547 #ifdef CONFIG_NUMA_BALANCING
549 if ((pmd_flags(pmd
) & (_PAGE_NUMA
|_PAGE_PRESENT
)) == _PAGE_NUMA
)
552 return (pmd_flags(pmd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
555 static inline unsigned long pages_to_mb(unsigned long npg
)
557 return npg
>> (20 - PAGE_SHIFT
);
560 #if PAGETABLE_LEVELS > 2
561 static inline int pud_none(pud_t pud
)
563 return native_pud_val(pud
) == 0;
566 static inline int pud_present(pud_t pud
)
568 return pud_flags(pud
) & _PAGE_PRESENT
;
571 static inline unsigned long pud_page_vaddr(pud_t pud
)
573 return (unsigned long)__va((unsigned long)pud_val(pud
) & PTE_PFN_MASK
);
577 * Currently stuck as a macro due to indirect forward reference to
578 * linux/mmzone.h's __section_mem_map_addr() definition:
580 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
582 /* Find an entry in the second-level page table.. */
583 static inline pmd_t
*pmd_offset(pud_t
*pud
, unsigned long address
)
585 return (pmd_t
*)pud_page_vaddr(*pud
) + pmd_index(address
);
588 static inline int pud_large(pud_t pud
)
590 return (pud_val(pud
) & (_PAGE_PSE
| _PAGE_PRESENT
)) ==
591 (_PAGE_PSE
| _PAGE_PRESENT
);
594 static inline int pud_bad(pud_t pud
)
596 return (pud_flags(pud
) & ~(_KERNPG_TABLE
| _PAGE_USER
)) != 0;
599 static inline int pud_large(pud_t pud
)
603 #endif /* PAGETABLE_LEVELS > 2 */
605 #if PAGETABLE_LEVELS > 3
606 static inline int pgd_present(pgd_t pgd
)
608 return pgd_flags(pgd
) & _PAGE_PRESENT
;
611 static inline unsigned long pgd_page_vaddr(pgd_t pgd
)
613 return (unsigned long)__va((unsigned long)pgd_val(pgd
) & PTE_PFN_MASK
);
617 * Currently stuck as a macro due to indirect forward reference to
618 * linux/mmzone.h's __section_mem_map_addr() definition:
620 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
622 /* to find an entry in a page-table-directory. */
623 static inline unsigned long pud_index(unsigned long address
)
625 return (address
>> PUD_SHIFT
) & (PTRS_PER_PUD
- 1);
628 static inline pud_t
*pud_offset(pgd_t
*pgd
, unsigned long address
)
630 return (pud_t
*)pgd_page_vaddr(*pgd
) + pud_index(address
);
633 static inline int pgd_bad(pgd_t pgd
)
635 return (pgd_flags(pgd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
638 static inline int pgd_none(pgd_t pgd
)
640 return !native_pgd_val(pgd
);
642 #endif /* PAGETABLE_LEVELS > 3 */
644 #endif /* __ASSEMBLY__ */
647 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
649 * this macro returns the index of the entry in the pgd page which would
650 * control the given virtual address
652 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
655 * pgd_offset() returns a (pgd_t *)
656 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
658 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
660 * a shortcut which implies the use of the kernel's pgd, instead
663 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
666 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
667 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
671 extern int direct_gbpages
;
672 void init_mem_mapping(void);
673 void early_alloc_pgt_buf(void);
675 /* local pte updates need not use xchg for locking */
676 static inline pte_t
native_local_ptep_get_and_clear(pte_t
*ptep
)
680 /* Pure native function needs no input for mm, addr */
681 native_pte_clear(NULL
, 0, ptep
);
685 static inline pmd_t
native_local_pmdp_get_and_clear(pmd_t
*pmdp
)
689 native_pmd_clear(pmdp
);
693 static inline void native_set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
694 pte_t
*ptep
, pte_t pte
)
696 native_set_pte(ptep
, pte
);
699 static inline void native_set_pmd_at(struct mm_struct
*mm
, unsigned long addr
,
700 pmd_t
*pmdp
, pmd_t pmd
)
702 native_set_pmd(pmdp
, pmd
);
705 #ifndef CONFIG_PARAVIRT
707 * Rules for using pte_update - it must be called after any PTE update which
708 * has not been done using the set_pte / clear_pte interfaces. It is used by
709 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
710 * updates should either be sets, clears, or set_pte_atomic for P->P
711 * transitions, which means this hook should only be called for user PTEs.
712 * This hook implies a P->P protection or access change has taken place, which
713 * requires a subsequent TLB flush. The notification can optionally be delayed
714 * until the TLB flush event by using the pte_update_defer form of the
715 * interface, but care must be taken to assure that the flush happens while
716 * still holding the same page table lock so that the shadow and primary pages
717 * do not become out of sync on SMP.
719 #define pte_update(mm, addr, ptep) do { } while (0)
720 #define pte_update_defer(mm, addr, ptep) do { } while (0)
724 * We only update the dirty/accessed state if we set
725 * the dirty bit by hand in the kernel, since the hardware
726 * will do the accessed bit for us, and we don't want to
727 * race with other CPU's that might be updating the dirty
728 * bit at the same time.
730 struct vm_area_struct
;
732 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
733 extern int ptep_set_access_flags(struct vm_area_struct
*vma
,
734 unsigned long address
, pte_t
*ptep
,
735 pte_t entry
, int dirty
);
737 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
738 extern int ptep_test_and_clear_young(struct vm_area_struct
*vma
,
739 unsigned long addr
, pte_t
*ptep
);
741 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
742 extern int ptep_clear_flush_young(struct vm_area_struct
*vma
,
743 unsigned long address
, pte_t
*ptep
);
745 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
746 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
749 pte_t pte
= native_ptep_get_and_clear(ptep
);
750 pte_update(mm
, addr
, ptep
);
754 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
755 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
,
756 unsigned long addr
, pte_t
*ptep
,
762 * Full address destruction in progress; paravirt does not
763 * care about updates and native needs no locking
765 pte
= native_local_ptep_get_and_clear(ptep
);
767 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
772 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
773 static inline void ptep_set_wrprotect(struct mm_struct
*mm
,
774 unsigned long addr
, pte_t
*ptep
)
776 clear_bit(_PAGE_BIT_RW
, (unsigned long *)&ptep
->pte
);
777 pte_update(mm
, addr
, ptep
);
780 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
782 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
784 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
785 extern int pmdp_set_access_flags(struct vm_area_struct
*vma
,
786 unsigned long address
, pmd_t
*pmdp
,
787 pmd_t entry
, int dirty
);
789 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
790 extern int pmdp_test_and_clear_young(struct vm_area_struct
*vma
,
791 unsigned long addr
, pmd_t
*pmdp
);
793 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
794 extern int pmdp_clear_flush_young(struct vm_area_struct
*vma
,
795 unsigned long address
, pmd_t
*pmdp
);
798 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
799 extern void pmdp_splitting_flush(struct vm_area_struct
*vma
,
800 unsigned long addr
, pmd_t
*pmdp
);
802 #define __HAVE_ARCH_PMD_WRITE
803 static inline int pmd_write(pmd_t pmd
)
805 return pmd_flags(pmd
) & _PAGE_RW
;
808 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
809 static inline pmd_t
pmdp_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
812 pmd_t pmd
= native_pmdp_get_and_clear(pmdp
);
813 pmd_update(mm
, addr
, pmdp
);
817 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
818 static inline void pmdp_set_wrprotect(struct mm_struct
*mm
,
819 unsigned long addr
, pmd_t
*pmdp
)
821 clear_bit(_PAGE_BIT_RW
, (unsigned long *)pmdp
);
822 pmd_update(mm
, addr
, pmdp
);
826 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
828 * dst - pointer to pgd range anwhere on a pgd page
830 * count - the number of pgds to copy.
832 * dst and src can be on the same page, but the range must not overlap,
833 * and must not cross a page boundary.
835 static inline void clone_pgd_range(pgd_t
*dst
, pgd_t
*src
, int count
)
837 memcpy(dst
, src
, count
* sizeof(pgd_t
));
840 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
841 static inline int page_level_shift(enum pg_level level
)
843 return (PAGE_SHIFT
- PTE_SHIFT
) + level
* PTE_SHIFT
;
845 static inline unsigned long page_level_size(enum pg_level level
)
847 return 1UL << page_level_shift(level
);
849 static inline unsigned long page_level_mask(enum pg_level level
)
851 return ~(page_level_size(level
) - 1);
855 * The x86 doesn't have any external MMU info: the kernel page
856 * tables contain all the necessary information.
858 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
859 unsigned long addr
, pte_t
*ptep
)
862 static inline void update_mmu_cache_pmd(struct vm_area_struct
*vma
,
863 unsigned long addr
, pmd_t
*pmd
)
867 #include <asm-generic/pgtable.h>
868 #endif /* __ASSEMBLY__ */
870 #endif /* _ASM_X86_PGTABLE_H */