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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)];
26 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
28 extern spinlock_t pgd_lock
;
29 extern struct list_head pgd_list
;
31 extern struct mm_struct
*pgd_page_get_mm(struct page
*page
);
33 #ifdef CONFIG_PARAVIRT
34 #include <asm/paravirt.h>
35 #else /* !CONFIG_PARAVIRT */
36 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
37 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
38 #define set_pmd_at(mm, addr, pmdp, pmd) native_set_pmd_at(mm, addr, pmdp, pmd)
40 #define set_pte_atomic(ptep, pte) \
41 native_set_pte_atomic(ptep, pte)
43 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
45 #ifndef __PAGETABLE_PUD_FOLDED
46 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
47 #define pgd_clear(pgd) native_pgd_clear(pgd)
51 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
54 #ifndef __PAGETABLE_PMD_FOLDED
55 #define pud_clear(pud) native_pud_clear(pud)
58 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
59 #define pmd_clear(pmd) native_pmd_clear(pmd)
61 #define pte_update(mm, addr, ptep) do { } while (0)
62 #define pte_update_defer(mm, addr, ptep) do { } while (0)
63 #define pmd_update(mm, addr, ptep) do { } while (0)
64 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
66 #define pgd_val(x) native_pgd_val(x)
67 #define __pgd(x) native_make_pgd(x)
69 #ifndef __PAGETABLE_PUD_FOLDED
70 #define pud_val(x) native_pud_val(x)
71 #define __pud(x) native_make_pud(x)
74 #ifndef __PAGETABLE_PMD_FOLDED
75 #define pmd_val(x) native_pmd_val(x)
76 #define __pmd(x) native_make_pmd(x)
79 #define pte_val(x) native_pte_val(x)
80 #define __pte(x) native_make_pte(x)
82 #define arch_end_context_switch(prev) do {} while(0)
84 #endif /* CONFIG_PARAVIRT */
87 * The following only work if pte_present() is true.
88 * Undefined behaviour if not..
90 static inline int pte_dirty(pte_t pte
)
92 return pte_flags(pte
) & _PAGE_DIRTY
;
95 static inline int pte_young(pte_t pte
)
97 return pte_flags(pte
) & _PAGE_ACCESSED
;
100 static inline int pmd_young(pmd_t pmd
)
102 return pmd_flags(pmd
) & _PAGE_ACCESSED
;
105 static inline int pte_write(pte_t pte
)
107 return pte_flags(pte
) & _PAGE_RW
;
110 static inline int pte_file(pte_t pte
)
112 return pte_flags(pte
) & _PAGE_FILE
;
115 static inline int pte_huge(pte_t pte
)
117 return pte_flags(pte
) & _PAGE_PSE
;
120 static inline int pte_global(pte_t pte
)
122 return pte_flags(pte
) & _PAGE_GLOBAL
;
125 static inline int pte_exec(pte_t pte
)
127 return !(pte_flags(pte
) & _PAGE_NX
);
130 static inline int pte_special(pte_t pte
)
132 return pte_flags(pte
) & _PAGE_SPECIAL
;
135 static inline unsigned long pte_pfn(pte_t pte
)
137 return (pte_val(pte
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
140 static inline unsigned long pmd_pfn(pmd_t pmd
)
142 return (pmd_val(pmd
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
145 static inline unsigned long pud_pfn(pud_t pud
)
147 return (pud_val(pud
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
150 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
152 static inline int pmd_large(pmd_t pte
)
154 return pmd_flags(pte
) & _PAGE_PSE
;
157 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
158 static inline int pmd_trans_splitting(pmd_t pmd
)
160 return pmd_val(pmd
) & _PAGE_SPLITTING
;
163 static inline int pmd_trans_huge(pmd_t pmd
)
165 return pmd_val(pmd
) & _PAGE_PSE
;
168 static inline int has_transparent_hugepage(void)
172 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
174 static inline pte_t
pte_set_flags(pte_t pte
, pteval_t set
)
176 pteval_t v
= native_pte_val(pte
);
178 return native_make_pte(v
| set
);
181 static inline pte_t
pte_clear_flags(pte_t pte
, pteval_t clear
)
183 pteval_t v
= native_pte_val(pte
);
185 return native_make_pte(v
& ~clear
);
188 static inline pte_t
pte_mkclean(pte_t pte
)
190 return pte_clear_flags(pte
, _PAGE_DIRTY
);
193 static inline pte_t
pte_mkold(pte_t pte
)
195 return pte_clear_flags(pte
, _PAGE_ACCESSED
);
198 static inline pte_t
pte_wrprotect(pte_t pte
)
200 return pte_clear_flags(pte
, _PAGE_RW
);
203 static inline pte_t
pte_mkexec(pte_t pte
)
205 return pte_clear_flags(pte
, _PAGE_NX
);
208 static inline pte_t
pte_mkdirty(pte_t pte
)
210 return pte_set_flags(pte
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
213 static inline pte_t
pte_mkyoung(pte_t pte
)
215 return pte_set_flags(pte
, _PAGE_ACCESSED
);
218 static inline pte_t
pte_mkwrite(pte_t pte
)
220 return pte_set_flags(pte
, _PAGE_RW
);
223 static inline pte_t
pte_mkhuge(pte_t pte
)
225 return pte_set_flags(pte
, _PAGE_PSE
);
228 static inline pte_t
pte_clrhuge(pte_t pte
)
230 return pte_clear_flags(pte
, _PAGE_PSE
);
233 static inline pte_t
pte_mkglobal(pte_t pte
)
235 return pte_set_flags(pte
, _PAGE_GLOBAL
);
238 static inline pte_t
pte_clrglobal(pte_t pte
)
240 return pte_clear_flags(pte
, _PAGE_GLOBAL
);
243 static inline pte_t
pte_mkspecial(pte_t pte
)
245 return pte_set_flags(pte
, _PAGE_SPECIAL
);
248 static inline pmd_t
pmd_set_flags(pmd_t pmd
, pmdval_t set
)
250 pmdval_t v
= native_pmd_val(pmd
);
252 return __pmd(v
| set
);
255 static inline pmd_t
pmd_clear_flags(pmd_t pmd
, pmdval_t clear
)
257 pmdval_t v
= native_pmd_val(pmd
);
259 return __pmd(v
& ~clear
);
262 static inline pmd_t
pmd_mkold(pmd_t pmd
)
264 return pmd_clear_flags(pmd
, _PAGE_ACCESSED
);
267 static inline pmd_t
pmd_wrprotect(pmd_t pmd
)
269 return pmd_clear_flags(pmd
, _PAGE_RW
);
272 static inline pmd_t
pmd_mkdirty(pmd_t pmd
)
274 return pmd_set_flags(pmd
, _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
277 static inline pmd_t
pmd_mkhuge(pmd_t pmd
)
279 return pmd_set_flags(pmd
, _PAGE_PSE
);
282 static inline pmd_t
pmd_mkyoung(pmd_t pmd
)
284 return pmd_set_flags(pmd
, _PAGE_ACCESSED
);
287 static inline pmd_t
pmd_mkwrite(pmd_t pmd
)
289 return pmd_set_flags(pmd
, _PAGE_RW
);
292 static inline pmd_t
pmd_mknotpresent(pmd_t pmd
)
294 return pmd_clear_flags(pmd
, _PAGE_PRESENT
);
297 static inline int pte_soft_dirty(pte_t pte
)
299 return pte_flags(pte
) & _PAGE_SOFT_DIRTY
;
302 static inline int pmd_soft_dirty(pmd_t pmd
)
304 return pmd_flags(pmd
) & _PAGE_SOFT_DIRTY
;
307 static inline pte_t
pte_mksoft_dirty(pte_t pte
)
309 return pte_set_flags(pte
, _PAGE_SOFT_DIRTY
);
312 static inline pmd_t
pmd_mksoft_dirty(pmd_t pmd
)
314 return pmd_set_flags(pmd
, _PAGE_SOFT_DIRTY
);
317 static inline pte_t
pte_swp_mksoft_dirty(pte_t pte
)
319 return pte_set_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
322 static inline int pte_swp_soft_dirty(pte_t pte
)
324 return pte_flags(pte
) & _PAGE_SWP_SOFT_DIRTY
;
327 static inline pte_t
pte_swp_clear_soft_dirty(pte_t pte
)
329 return pte_clear_flags(pte
, _PAGE_SWP_SOFT_DIRTY
);
333 * Mask out unsupported bits in a present pgprot. Non-present pgprots
334 * can use those bits for other purposes, so leave them be.
336 static inline pgprotval_t
massage_pgprot(pgprot_t pgprot
)
338 pgprotval_t protval
= pgprot_val(pgprot
);
340 if (protval
& _PAGE_PRESENT
)
341 protval
&= __supported_pte_mask
;
346 static inline pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
348 return __pte(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
349 massage_pgprot(pgprot
));
352 static inline pmd_t
pfn_pmd(unsigned long page_nr
, pgprot_t pgprot
)
354 return __pmd(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
355 massage_pgprot(pgprot
));
358 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
360 pteval_t val
= pte_val(pte
);
363 * Chop off the NX bit (if present), and add the NX portion of
364 * the newprot (if present):
366 val
&= _PAGE_CHG_MASK
;
367 val
|= massage_pgprot(newprot
) & ~_PAGE_CHG_MASK
;
372 static inline pmd_t
pmd_modify(pmd_t pmd
, pgprot_t newprot
)
374 pmdval_t val
= pmd_val(pmd
);
376 val
&= _HPAGE_CHG_MASK
;
377 val
|= massage_pgprot(newprot
) & ~_HPAGE_CHG_MASK
;
382 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
383 #define pgprot_modify pgprot_modify
384 static inline pgprot_t
pgprot_modify(pgprot_t oldprot
, pgprot_t newprot
)
386 pgprotval_t preservebits
= pgprot_val(oldprot
) & _PAGE_CHG_MASK
;
387 pgprotval_t addbits
= pgprot_val(newprot
);
388 return __pgprot(preservebits
| addbits
);
391 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
393 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
395 static inline int is_new_memtype_allowed(u64 paddr
, unsigned long size
,
397 unsigned long new_flags
)
400 * PAT type is always WB for untracked ranges, so no need to check.
402 if (x86_platform
.is_untracked_pat_range(paddr
, paddr
+ size
))
406 * Certain new memtypes are not allowed with certain
408 * - request is uncached, return cannot be write-back
409 * - request is write-combine, return cannot be write-back
411 if ((flags
== _PAGE_CACHE_UC_MINUS
&&
412 new_flags
== _PAGE_CACHE_WB
) ||
413 (flags
== _PAGE_CACHE_WC
&&
414 new_flags
== _PAGE_CACHE_WB
)) {
421 pmd_t
*populate_extra_pmd(unsigned long vaddr
);
422 pte_t
*populate_extra_pte(unsigned long vaddr
);
423 #endif /* __ASSEMBLY__ */
426 # include <asm/pgtable_32.h>
428 # include <asm/pgtable_64.h>
432 #include <linux/mm_types.h>
433 #include <linux/log2.h>
435 static inline int pte_none(pte_t pte
)
440 #define __HAVE_ARCH_PTE_SAME
441 static inline int pte_same(pte_t a
, pte_t b
)
443 return a
.pte
== b
.pte
;
446 static inline int pte_present(pte_t a
)
448 return pte_flags(a
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
|
452 #define pte_accessible pte_accessible
453 static inline int pte_accessible(pte_t a
)
455 return pte_flags(a
) & _PAGE_PRESENT
;
458 static inline int pte_hidden(pte_t pte
)
460 return pte_flags(pte
) & _PAGE_HIDDEN
;
463 static inline int pmd_present(pmd_t pmd
)
466 * Checking for _PAGE_PSE is needed too because
467 * split_huge_page will temporarily clear the present bit (but
468 * the _PAGE_PSE flag will remain set at all times while the
469 * _PAGE_PRESENT bit is clear).
471 return pmd_flags(pmd
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
| _PAGE_PSE
|
475 static inline int pmd_none(pmd_t pmd
)
477 /* Only check low word on 32-bit platforms, since it might be
478 out of sync with upper half. */
479 return (unsigned long)native_pmd_val(pmd
) == 0;
482 static inline unsigned long pmd_page_vaddr(pmd_t pmd
)
484 return (unsigned long)__va(pmd_val(pmd
) & PTE_PFN_MASK
);
488 * Currently stuck as a macro due to indirect forward reference to
489 * linux/mmzone.h's __section_mem_map_addr() definition:
491 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
494 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
496 * this macro returns the index of the entry in the pmd page which would
497 * control the given virtual address
499 static inline unsigned long pmd_index(unsigned long address
)
501 return (address
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1);
505 * Conversion functions: convert a page and protection to a page entry,
506 * and a page entry and page directory to the page they refer to.
508 * (Currently stuck as a macro because of indirect forward reference
509 * to linux/mm.h:page_to_nid())
511 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
514 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
516 * this function returns the index of the entry in the pte page which would
517 * control the given virtual address
519 static inline unsigned long pte_index(unsigned long address
)
521 return (address
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1);
524 static inline pte_t
*pte_offset_kernel(pmd_t
*pmd
, unsigned long address
)
526 return (pte_t
*)pmd_page_vaddr(*pmd
) + pte_index(address
);
529 static inline int pmd_bad(pmd_t pmd
)
531 #ifdef CONFIG_NUMA_BALANCING
533 if ((pmd_flags(pmd
) & (_PAGE_NUMA
|_PAGE_PRESENT
)) == _PAGE_NUMA
)
536 return (pmd_flags(pmd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
539 static inline unsigned long pages_to_mb(unsigned long npg
)
541 return npg
>> (20 - PAGE_SHIFT
);
544 #if PAGETABLE_LEVELS > 2
545 static inline int pud_none(pud_t pud
)
547 return native_pud_val(pud
) == 0;
550 static inline int pud_present(pud_t pud
)
552 return pud_flags(pud
) & _PAGE_PRESENT
;
555 static inline unsigned long pud_page_vaddr(pud_t pud
)
557 return (unsigned long)__va((unsigned long)pud_val(pud
) & PTE_PFN_MASK
);
561 * Currently stuck as a macro due to indirect forward reference to
562 * linux/mmzone.h's __section_mem_map_addr() definition:
564 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
566 /* Find an entry in the second-level page table.. */
567 static inline pmd_t
*pmd_offset(pud_t
*pud
, unsigned long address
)
569 return (pmd_t
*)pud_page_vaddr(*pud
) + pmd_index(address
);
572 static inline int pud_large(pud_t pud
)
574 return (pud_val(pud
) & (_PAGE_PSE
| _PAGE_PRESENT
)) ==
575 (_PAGE_PSE
| _PAGE_PRESENT
);
578 static inline int pud_bad(pud_t pud
)
580 return (pud_flags(pud
) & ~(_KERNPG_TABLE
| _PAGE_USER
)) != 0;
583 static inline int pud_large(pud_t pud
)
587 #endif /* PAGETABLE_LEVELS > 2 */
589 #if PAGETABLE_LEVELS > 3
590 static inline int pgd_present(pgd_t pgd
)
592 return pgd_flags(pgd
) & _PAGE_PRESENT
;
595 static inline unsigned long pgd_page_vaddr(pgd_t pgd
)
597 return (unsigned long)__va((unsigned long)pgd_val(pgd
) & PTE_PFN_MASK
);
601 * Currently stuck as a macro due to indirect forward reference to
602 * linux/mmzone.h's __section_mem_map_addr() definition:
604 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
606 /* to find an entry in a page-table-directory. */
607 static inline unsigned long pud_index(unsigned long address
)
609 return (address
>> PUD_SHIFT
) & (PTRS_PER_PUD
- 1);
612 static inline pud_t
*pud_offset(pgd_t
*pgd
, unsigned long address
)
614 return (pud_t
*)pgd_page_vaddr(*pgd
) + pud_index(address
);
617 static inline int pgd_bad(pgd_t pgd
)
619 return (pgd_flags(pgd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
622 static inline int pgd_none(pgd_t pgd
)
624 return !native_pgd_val(pgd
);
626 #endif /* PAGETABLE_LEVELS > 3 */
628 #endif /* __ASSEMBLY__ */
631 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
633 * this macro returns the index of the entry in the pgd page which would
634 * control the given virtual address
636 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
639 * pgd_offset() returns a (pgd_t *)
640 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
642 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
644 * a shortcut which implies the use of the kernel's pgd, instead
647 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
650 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
651 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
655 extern int direct_gbpages
;
656 void init_mem_mapping(void);
657 void early_alloc_pgt_buf(void);
659 /* local pte updates need not use xchg for locking */
660 static inline pte_t
native_local_ptep_get_and_clear(pte_t
*ptep
)
664 /* Pure native function needs no input for mm, addr */
665 native_pte_clear(NULL
, 0, ptep
);
669 static inline pmd_t
native_local_pmdp_get_and_clear(pmd_t
*pmdp
)
673 native_pmd_clear(pmdp
);
677 static inline void native_set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
678 pte_t
*ptep
, pte_t pte
)
680 native_set_pte(ptep
, pte
);
683 static inline void native_set_pmd_at(struct mm_struct
*mm
, unsigned long addr
,
684 pmd_t
*pmdp
, pmd_t pmd
)
686 native_set_pmd(pmdp
, pmd
);
689 #ifndef CONFIG_PARAVIRT
691 * Rules for using pte_update - it must be called after any PTE update which
692 * has not been done using the set_pte / clear_pte interfaces. It is used by
693 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
694 * updates should either be sets, clears, or set_pte_atomic for P->P
695 * transitions, which means this hook should only be called for user PTEs.
696 * This hook implies a P->P protection or access change has taken place, which
697 * requires a subsequent TLB flush. The notification can optionally be delayed
698 * until the TLB flush event by using the pte_update_defer form of the
699 * interface, but care must be taken to assure that the flush happens while
700 * still holding the same page table lock so that the shadow and primary pages
701 * do not become out of sync on SMP.
703 #define pte_update(mm, addr, ptep) do { } while (0)
704 #define pte_update_defer(mm, addr, ptep) do { } while (0)
708 * We only update the dirty/accessed state if we set
709 * the dirty bit by hand in the kernel, since the hardware
710 * will do the accessed bit for us, and we don't want to
711 * race with other CPU's that might be updating the dirty
712 * bit at the same time.
714 struct vm_area_struct
;
716 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
717 extern int ptep_set_access_flags(struct vm_area_struct
*vma
,
718 unsigned long address
, pte_t
*ptep
,
719 pte_t entry
, int dirty
);
721 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
722 extern int ptep_test_and_clear_young(struct vm_area_struct
*vma
,
723 unsigned long addr
, pte_t
*ptep
);
725 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
726 extern int ptep_clear_flush_young(struct vm_area_struct
*vma
,
727 unsigned long address
, pte_t
*ptep
);
729 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
730 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
733 pte_t pte
= native_ptep_get_and_clear(ptep
);
734 pte_update(mm
, addr
, ptep
);
738 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
739 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
,
740 unsigned long addr
, pte_t
*ptep
,
746 * Full address destruction in progress; paravirt does not
747 * care about updates and native needs no locking
749 pte
= native_local_ptep_get_and_clear(ptep
);
751 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
756 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
757 static inline void ptep_set_wrprotect(struct mm_struct
*mm
,
758 unsigned long addr
, pte_t
*ptep
)
760 clear_bit(_PAGE_BIT_RW
, (unsigned long *)&ptep
->pte
);
761 pte_update(mm
, addr
, ptep
);
764 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
766 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
768 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
769 extern int pmdp_set_access_flags(struct vm_area_struct
*vma
,
770 unsigned long address
, pmd_t
*pmdp
,
771 pmd_t entry
, int dirty
);
773 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
774 extern int pmdp_test_and_clear_young(struct vm_area_struct
*vma
,
775 unsigned long addr
, pmd_t
*pmdp
);
777 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
778 extern int pmdp_clear_flush_young(struct vm_area_struct
*vma
,
779 unsigned long address
, pmd_t
*pmdp
);
782 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
783 extern void pmdp_splitting_flush(struct vm_area_struct
*vma
,
784 unsigned long addr
, pmd_t
*pmdp
);
786 #define __HAVE_ARCH_PMD_WRITE
787 static inline int pmd_write(pmd_t pmd
)
789 return pmd_flags(pmd
) & _PAGE_RW
;
792 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
793 static inline pmd_t
pmdp_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
796 pmd_t pmd
= native_pmdp_get_and_clear(pmdp
);
797 pmd_update(mm
, addr
, pmdp
);
801 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
802 static inline void pmdp_set_wrprotect(struct mm_struct
*mm
,
803 unsigned long addr
, pmd_t
*pmdp
)
805 clear_bit(_PAGE_BIT_RW
, (unsigned long *)pmdp
);
806 pmd_update(mm
, addr
, pmdp
);
810 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
812 * dst - pointer to pgd range anwhere on a pgd page
814 * count - the number of pgds to copy.
816 * dst and src can be on the same page, but the range must not overlap,
817 * and must not cross a page boundary.
819 static inline void clone_pgd_range(pgd_t
*dst
, pgd_t
*src
, int count
)
821 memcpy(dst
, src
, count
* sizeof(pgd_t
));
824 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
825 static inline int page_level_shift(enum pg_level level
)
827 return (PAGE_SHIFT
- PTE_SHIFT
) + level
* PTE_SHIFT
;
829 static inline unsigned long page_level_size(enum pg_level level
)
831 return 1UL << page_level_shift(level
);
833 static inline unsigned long page_level_mask(enum pg_level level
)
835 return ~(page_level_size(level
) - 1);
839 * The x86 doesn't have any external MMU info: the kernel page
840 * tables contain all the necessary information.
842 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
843 unsigned long addr
, pte_t
*ptep
)
846 static inline void update_mmu_cache_pmd(struct vm_area_struct
*vma
,
847 unsigned long addr
, pmd_t
*pmd
)
851 #include <asm-generic/pgtable.h>
852 #endif /* __ASSEMBLY__ */
854 #endif /* _ASM_X86_PGTABLE_H */