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
);
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
);
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
);
298 * Mask out unsupported bits in a present pgprot. Non-present pgprots
299 * can use those bits for other purposes, so leave them be.
301 static inline pgprotval_t
massage_pgprot(pgprot_t pgprot
)
303 pgprotval_t protval
= pgprot_val(pgprot
);
305 if (protval
& _PAGE_PRESENT
)
306 protval
&= __supported_pte_mask
;
311 static inline pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
313 return __pte(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
314 massage_pgprot(pgprot
));
317 static inline pmd_t
pfn_pmd(unsigned long page_nr
, pgprot_t pgprot
)
319 return __pmd(((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
320 massage_pgprot(pgprot
));
323 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
325 pteval_t val
= pte_val(pte
);
328 * Chop off the NX bit (if present), and add the NX portion of
329 * the newprot (if present):
331 val
&= _PAGE_CHG_MASK
;
332 val
|= massage_pgprot(newprot
) & ~_PAGE_CHG_MASK
;
337 static inline pmd_t
pmd_modify(pmd_t pmd
, pgprot_t newprot
)
339 pmdval_t val
= pmd_val(pmd
);
341 val
&= _HPAGE_CHG_MASK
;
342 val
|= massage_pgprot(newprot
) & ~_HPAGE_CHG_MASK
;
347 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
348 #define pgprot_modify pgprot_modify
349 static inline pgprot_t
pgprot_modify(pgprot_t oldprot
, pgprot_t newprot
)
351 pgprotval_t preservebits
= pgprot_val(oldprot
) & _PAGE_CHG_MASK
;
352 pgprotval_t addbits
= pgprot_val(newprot
);
353 return __pgprot(preservebits
| addbits
);
356 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
358 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
360 static inline int is_new_memtype_allowed(u64 paddr
, unsigned long size
,
362 unsigned long new_flags
)
365 * PAT type is always WB for untracked ranges, so no need to check.
367 if (x86_platform
.is_untracked_pat_range(paddr
, paddr
+ size
))
371 * Certain new memtypes are not allowed with certain
373 * - request is uncached, return cannot be write-back
374 * - request is write-combine, return cannot be write-back
376 if ((flags
== _PAGE_CACHE_UC_MINUS
&&
377 new_flags
== _PAGE_CACHE_WB
) ||
378 (flags
== _PAGE_CACHE_WC
&&
379 new_flags
== _PAGE_CACHE_WB
)) {
386 pmd_t
*populate_extra_pmd(unsigned long vaddr
);
387 pte_t
*populate_extra_pte(unsigned long vaddr
);
388 #endif /* __ASSEMBLY__ */
391 # include <asm/pgtable_32.h>
393 # include <asm/pgtable_64.h>
397 #include <linux/mm_types.h>
398 #include <linux/log2.h>
400 static inline int pte_none(pte_t pte
)
405 #define __HAVE_ARCH_PTE_SAME
406 static inline int pte_same(pte_t a
, pte_t b
)
408 return a
.pte
== b
.pte
;
411 static inline int pte_present(pte_t a
)
413 return pte_flags(a
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
|
417 #define pte_accessible pte_accessible
418 static inline int pte_accessible(pte_t a
)
420 return pte_flags(a
) & _PAGE_PRESENT
;
423 static inline int pte_hidden(pte_t pte
)
425 return pte_flags(pte
) & _PAGE_HIDDEN
;
428 static inline int pmd_present(pmd_t pmd
)
431 * Checking for _PAGE_PSE is needed too because
432 * split_huge_page will temporarily clear the present bit (but
433 * the _PAGE_PSE flag will remain set at all times while the
434 * _PAGE_PRESENT bit is clear).
436 return pmd_flags(pmd
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
| _PAGE_PSE
|
440 static inline int pmd_none(pmd_t pmd
)
442 /* Only check low word on 32-bit platforms, since it might be
443 out of sync with upper half. */
444 return (unsigned long)native_pmd_val(pmd
) == 0;
447 static inline unsigned long pmd_page_vaddr(pmd_t pmd
)
449 return (unsigned long)__va(pmd_val(pmd
) & PTE_PFN_MASK
);
453 * Currently stuck as a macro due to indirect forward reference to
454 * linux/mmzone.h's __section_mem_map_addr() definition:
456 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
459 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
461 * this macro returns the index of the entry in the pmd page which would
462 * control the given virtual address
464 static inline unsigned long pmd_index(unsigned long address
)
466 return (address
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1);
470 * Conversion functions: convert a page and protection to a page entry,
471 * and a page entry and page directory to the page they refer to.
473 * (Currently stuck as a macro because of indirect forward reference
474 * to linux/mm.h:page_to_nid())
476 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
479 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
481 * this function returns the index of the entry in the pte page which would
482 * control the given virtual address
484 static inline unsigned long pte_index(unsigned long address
)
486 return (address
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1);
489 static inline pte_t
*pte_offset_kernel(pmd_t
*pmd
, unsigned long address
)
491 return (pte_t
*)pmd_page_vaddr(*pmd
) + pte_index(address
);
494 static inline int pmd_bad(pmd_t pmd
)
496 #ifdef CONFIG_NUMA_BALANCING
498 if ((pmd_flags(pmd
) & (_PAGE_NUMA
|_PAGE_PRESENT
)) == _PAGE_NUMA
)
501 return (pmd_flags(pmd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
504 static inline unsigned long pages_to_mb(unsigned long npg
)
506 return npg
>> (20 - PAGE_SHIFT
);
509 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
510 remap_pfn_range(vma, vaddr, pfn, size, prot)
512 #if PAGETABLE_LEVELS > 2
513 static inline int pud_none(pud_t pud
)
515 return native_pud_val(pud
) == 0;
518 static inline int pud_present(pud_t pud
)
520 return pud_flags(pud
) & _PAGE_PRESENT
;
523 static inline unsigned long pud_page_vaddr(pud_t pud
)
525 return (unsigned long)__va((unsigned long)pud_val(pud
) & PTE_PFN_MASK
);
529 * Currently stuck as a macro due to indirect forward reference to
530 * linux/mmzone.h's __section_mem_map_addr() definition:
532 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
534 /* Find an entry in the second-level page table.. */
535 static inline pmd_t
*pmd_offset(pud_t
*pud
, unsigned long address
)
537 return (pmd_t
*)pud_page_vaddr(*pud
) + pmd_index(address
);
540 static inline int pud_large(pud_t pud
)
542 return (pud_val(pud
) & (_PAGE_PSE
| _PAGE_PRESENT
)) ==
543 (_PAGE_PSE
| _PAGE_PRESENT
);
546 static inline int pud_bad(pud_t pud
)
548 return (pud_flags(pud
) & ~(_KERNPG_TABLE
| _PAGE_USER
)) != 0;
551 static inline int pud_large(pud_t pud
)
555 #endif /* PAGETABLE_LEVELS > 2 */
557 #if PAGETABLE_LEVELS > 3
558 static inline int pgd_present(pgd_t pgd
)
560 return pgd_flags(pgd
) & _PAGE_PRESENT
;
563 static inline unsigned long pgd_page_vaddr(pgd_t pgd
)
565 return (unsigned long)__va((unsigned long)pgd_val(pgd
) & PTE_PFN_MASK
);
569 * Currently stuck as a macro due to indirect forward reference to
570 * linux/mmzone.h's __section_mem_map_addr() definition:
572 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
574 /* to find an entry in a page-table-directory. */
575 static inline unsigned long pud_index(unsigned long address
)
577 return (address
>> PUD_SHIFT
) & (PTRS_PER_PUD
- 1);
580 static inline pud_t
*pud_offset(pgd_t
*pgd
, unsigned long address
)
582 return (pud_t
*)pgd_page_vaddr(*pgd
) + pud_index(address
);
585 static inline int pgd_bad(pgd_t pgd
)
587 return (pgd_flags(pgd
) & ~_PAGE_USER
) != _KERNPG_TABLE
;
590 static inline int pgd_none(pgd_t pgd
)
592 return !native_pgd_val(pgd
);
594 #endif /* PAGETABLE_LEVELS > 3 */
596 #endif /* __ASSEMBLY__ */
599 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
601 * this macro returns the index of the entry in the pgd page which would
602 * control the given virtual address
604 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
607 * pgd_offset() returns a (pgd_t *)
608 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
610 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
612 * a shortcut which implies the use of the kernel's pgd, instead
615 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
618 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
619 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
623 extern int direct_gbpages
;
624 void init_mem_mapping(void);
625 void early_alloc_pgt_buf(void);
627 /* local pte updates need not use xchg for locking */
628 static inline pte_t
native_local_ptep_get_and_clear(pte_t
*ptep
)
632 /* Pure native function needs no input for mm, addr */
633 native_pte_clear(NULL
, 0, ptep
);
637 static inline pmd_t
native_local_pmdp_get_and_clear(pmd_t
*pmdp
)
641 native_pmd_clear(pmdp
);
645 static inline void native_set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
646 pte_t
*ptep
, pte_t pte
)
648 native_set_pte(ptep
, pte
);
651 static inline void native_set_pmd_at(struct mm_struct
*mm
, unsigned long addr
,
652 pmd_t
*pmdp
, pmd_t pmd
)
654 native_set_pmd(pmdp
, pmd
);
657 #ifndef CONFIG_PARAVIRT
659 * Rules for using pte_update - it must be called after any PTE update which
660 * has not been done using the set_pte / clear_pte interfaces. It is used by
661 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
662 * updates should either be sets, clears, or set_pte_atomic for P->P
663 * transitions, which means this hook should only be called for user PTEs.
664 * This hook implies a P->P protection or access change has taken place, which
665 * requires a subsequent TLB flush. The notification can optionally be delayed
666 * until the TLB flush event by using the pte_update_defer form of the
667 * interface, but care must be taken to assure that the flush happens while
668 * still holding the same page table lock so that the shadow and primary pages
669 * do not become out of sync on SMP.
671 #define pte_update(mm, addr, ptep) do { } while (0)
672 #define pte_update_defer(mm, addr, ptep) do { } while (0)
676 * We only update the dirty/accessed state if we set
677 * the dirty bit by hand in the kernel, since the hardware
678 * will do the accessed bit for us, and we don't want to
679 * race with other CPU's that might be updating the dirty
680 * bit at the same time.
682 struct vm_area_struct
;
684 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
685 extern int ptep_set_access_flags(struct vm_area_struct
*vma
,
686 unsigned long address
, pte_t
*ptep
,
687 pte_t entry
, int dirty
);
689 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
690 extern int ptep_test_and_clear_young(struct vm_area_struct
*vma
,
691 unsigned long addr
, pte_t
*ptep
);
693 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
694 extern int ptep_clear_flush_young(struct vm_area_struct
*vma
,
695 unsigned long address
, pte_t
*ptep
);
697 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
698 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
701 pte_t pte
= native_ptep_get_and_clear(ptep
);
702 pte_update(mm
, addr
, ptep
);
706 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
707 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
,
708 unsigned long addr
, pte_t
*ptep
,
714 * Full address destruction in progress; paravirt does not
715 * care about updates and native needs no locking
717 pte
= native_local_ptep_get_and_clear(ptep
);
719 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
724 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
725 static inline void ptep_set_wrprotect(struct mm_struct
*mm
,
726 unsigned long addr
, pte_t
*ptep
)
728 clear_bit(_PAGE_BIT_RW
, (unsigned long *)&ptep
->pte
);
729 pte_update(mm
, addr
, ptep
);
732 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
734 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
736 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
737 extern int pmdp_set_access_flags(struct vm_area_struct
*vma
,
738 unsigned long address
, pmd_t
*pmdp
,
739 pmd_t entry
, int dirty
);
741 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
742 extern int pmdp_test_and_clear_young(struct vm_area_struct
*vma
,
743 unsigned long addr
, pmd_t
*pmdp
);
745 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
746 extern int pmdp_clear_flush_young(struct vm_area_struct
*vma
,
747 unsigned long address
, pmd_t
*pmdp
);
750 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
751 extern void pmdp_splitting_flush(struct vm_area_struct
*vma
,
752 unsigned long addr
, pmd_t
*pmdp
);
754 #define __HAVE_ARCH_PMD_WRITE
755 static inline int pmd_write(pmd_t pmd
)
757 return pmd_flags(pmd
) & _PAGE_RW
;
760 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
761 static inline pmd_t
pmdp_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
764 pmd_t pmd
= native_pmdp_get_and_clear(pmdp
);
765 pmd_update(mm
, addr
, pmdp
);
769 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
770 static inline void pmdp_set_wrprotect(struct mm_struct
*mm
,
771 unsigned long addr
, pmd_t
*pmdp
)
773 clear_bit(_PAGE_BIT_RW
, (unsigned long *)pmdp
);
774 pmd_update(mm
, addr
, pmdp
);
778 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
780 * dst - pointer to pgd range anwhere on a pgd page
782 * count - the number of pgds to copy.
784 * dst and src can be on the same page, but the range must not overlap,
785 * and must not cross a page boundary.
787 static inline void clone_pgd_range(pgd_t
*dst
, pgd_t
*src
, int count
)
789 memcpy(dst
, src
, count
* sizeof(pgd_t
));
792 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
793 static inline int page_level_shift(enum pg_level level
)
795 return (PAGE_SHIFT
- PTE_SHIFT
) + level
* PTE_SHIFT
;
797 static inline unsigned long page_level_size(enum pg_level level
)
799 return 1UL << page_level_shift(level
);
801 static inline unsigned long page_level_mask(enum pg_level level
)
803 return ~(page_level_size(level
) - 1);
807 * The x86 doesn't have any external MMU info: the kernel page
808 * tables contain all the necessary information.
810 static inline void update_mmu_cache(struct vm_area_struct
*vma
,
811 unsigned long addr
, pte_t
*ptep
)
814 static inline void update_mmu_cache_pmd(struct vm_area_struct
*vma
,
815 unsigned long addr
, pmd_t
*pmd
)
819 #include <asm-generic/pgtable.h>
820 #endif /* __ASSEMBLY__ */
822 #endif /* _ASM_X86_PGTABLE_H */
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