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[linux/fpc-iii.git] / arch / x86 / include / asm / pgtable.h
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1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
4 #include <asm/page.h>
5 #include <asm/e820.h>
7 #include <asm/pgtable_types.h>
9 /*
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))) \
16 : (prot))
18 #ifndef __ASSEMBLY__
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()
26 #else
27 #define debug_checkwx() do { } while (0)
28 #endif
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)]
35 __visible;
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)
58 #endif
60 #ifndef set_pud
61 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
62 #endif
64 #ifndef __PAGETABLE_PMD_FOLDED
65 #define pud_clear(pud) native_pud_clear(pud)
66 #endif
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)
79 #endif
81 #ifndef __PAGETABLE_PMD_FOLDED
82 #define pmd_val(x) native_pmd_val(x)
83 #define __pmd(x) native_make_pmd(x)
84 #endif
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;
102 static inline int pte_young(pte_t pte)
104 return pte_flags(pte) & _PAGE_ACCESSED;
107 static inline int pmd_dirty(pmd_t pmd)
109 return pmd_flags(pmd) & _PAGE_DIRTY;
112 static inline int pmd_young(pmd_t pmd)
114 return pmd_flags(pmd) & _PAGE_ACCESSED;
117 static inline int pte_write(pte_t pte)
119 return pte_flags(pte) & _PAGE_RW;
122 static inline int pte_huge(pte_t pte)
124 return pte_flags(pte) & _PAGE_PSE;
127 static inline int pte_global(pte_t pte)
129 return pte_flags(pte) & _PAGE_GLOBAL;
132 static inline int pte_exec(pte_t pte)
134 return !(pte_flags(pte) & _PAGE_NX);
137 static inline int pte_special(pte_t pte)
139 return pte_flags(pte) & _PAGE_SPECIAL;
142 static inline unsigned long pte_pfn(pte_t pte)
144 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
147 static inline unsigned long pmd_pfn(pmd_t pmd)
149 return (pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
152 static inline unsigned long pud_pfn(pud_t pud)
154 return (pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT;
157 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
159 static inline int pmd_large(pmd_t pte)
161 return pmd_flags(pte) & _PAGE_PSE;
164 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
165 static inline int pmd_trans_splitting(pmd_t pmd)
167 return pmd_val(pmd) & _PAGE_SPLITTING;
170 static inline int pmd_trans_huge(pmd_t pmd)
172 return pmd_val(pmd) & _PAGE_PSE;
175 static inline int has_transparent_hugepage(void)
177 return cpu_has_pse;
179 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
181 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
183 pteval_t v = native_pte_val(pte);
185 return native_make_pte(v | set);
188 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
190 pteval_t v = native_pte_val(pte);
192 return native_make_pte(v & ~clear);
195 static inline pte_t pte_mkclean(pte_t pte)
197 return pte_clear_flags(pte, _PAGE_DIRTY);
200 static inline pte_t pte_mkold(pte_t pte)
202 return pte_clear_flags(pte, _PAGE_ACCESSED);
205 static inline pte_t pte_wrprotect(pte_t pte)
207 return pte_clear_flags(pte, _PAGE_RW);
210 static inline pte_t pte_mkexec(pte_t pte)
212 return pte_clear_flags(pte, _PAGE_NX);
215 static inline pte_t pte_mkdirty(pte_t pte)
217 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
220 static inline pte_t pte_mkyoung(pte_t pte)
222 return pte_set_flags(pte, _PAGE_ACCESSED);
225 static inline pte_t pte_mkwrite(pte_t pte)
227 return pte_set_flags(pte, _PAGE_RW);
230 static inline pte_t pte_mkhuge(pte_t pte)
232 return pte_set_flags(pte, _PAGE_PSE);
235 static inline pte_t pte_clrhuge(pte_t pte)
237 return pte_clear_flags(pte, _PAGE_PSE);
240 static inline pte_t pte_mkglobal(pte_t pte)
242 return pte_set_flags(pte, _PAGE_GLOBAL);
245 static inline pte_t pte_clrglobal(pte_t pte)
247 return pte_clear_flags(pte, _PAGE_GLOBAL);
250 static inline pte_t pte_mkspecial(pte_t pte)
252 return pte_set_flags(pte, _PAGE_SPECIAL);
255 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
257 pmdval_t v = native_pmd_val(pmd);
259 return __pmd(v | set);
262 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
264 pmdval_t v = native_pmd_val(pmd);
266 return __pmd(v & ~clear);
269 static inline pmd_t pmd_mkold(pmd_t pmd)
271 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
274 static inline pmd_t pmd_wrprotect(pmd_t pmd)
276 return pmd_clear_flags(pmd, _PAGE_RW);
279 static inline pmd_t pmd_mkdirty(pmd_t pmd)
281 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
284 static inline pmd_t pmd_mkhuge(pmd_t pmd)
286 return pmd_set_flags(pmd, _PAGE_PSE);
289 static inline pmd_t pmd_mkyoung(pmd_t pmd)
291 return pmd_set_flags(pmd, _PAGE_ACCESSED);
294 static inline pmd_t pmd_mkwrite(pmd_t pmd)
296 return pmd_set_flags(pmd, _PAGE_RW);
299 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
301 return pmd_clear_flags(pmd, _PAGE_PRESENT | _PAGE_PROTNONE);
304 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
305 static inline int pte_soft_dirty(pte_t pte)
307 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
310 static inline int pmd_soft_dirty(pmd_t pmd)
312 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
315 static inline pte_t pte_mksoft_dirty(pte_t pte)
317 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
320 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
322 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
325 static inline pte_t pte_clear_soft_dirty(pte_t pte)
327 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
330 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
332 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
335 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
338 * Mask out unsupported bits in a present pgprot. Non-present pgprots
339 * can use those bits for other purposes, so leave them be.
341 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
343 pgprotval_t protval = pgprot_val(pgprot);
345 if (protval & _PAGE_PRESENT)
346 protval &= __supported_pte_mask;
348 return protval;
351 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
353 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
354 massage_pgprot(pgprot));
357 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
359 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
360 massage_pgprot(pgprot));
363 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
365 pteval_t val = pte_val(pte);
368 * Chop off the NX bit (if present), and add the NX portion of
369 * the newprot (if present):
371 val &= _PAGE_CHG_MASK;
372 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
374 return __pte(val);
377 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
379 pmdval_t val = pmd_val(pmd);
381 val &= _HPAGE_CHG_MASK;
382 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
384 return __pmd(val);
387 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
388 #define pgprot_modify pgprot_modify
389 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
391 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
392 pgprotval_t addbits = pgprot_val(newprot);
393 return __pgprot(preservebits | addbits);
396 #define pte_pgprot(x) __pgprot(pte_flags(x))
397 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
398 #define pud_pgprot(x) __pgprot(pud_flags(x))
400 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
402 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
403 enum page_cache_mode pcm,
404 enum page_cache_mode new_pcm)
407 * PAT type is always WB for untracked ranges, so no need to check.
409 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
410 return 1;
413 * Certain new memtypes are not allowed with certain
414 * requested memtype:
415 * - request is uncached, return cannot be write-back
416 * - request is write-combine, return cannot be write-back
417 * - request is write-through, return cannot be write-back
418 * - request is write-through, return cannot be write-combine
420 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
421 new_pcm == _PAGE_CACHE_MODE_WB) ||
422 (pcm == _PAGE_CACHE_MODE_WC &&
423 new_pcm == _PAGE_CACHE_MODE_WB) ||
424 (pcm == _PAGE_CACHE_MODE_WT &&
425 new_pcm == _PAGE_CACHE_MODE_WB) ||
426 (pcm == _PAGE_CACHE_MODE_WT &&
427 new_pcm == _PAGE_CACHE_MODE_WC)) {
428 return 0;
431 return 1;
434 pmd_t *populate_extra_pmd(unsigned long vaddr);
435 pte_t *populate_extra_pte(unsigned long vaddr);
436 #endif /* __ASSEMBLY__ */
438 #ifdef CONFIG_X86_32
439 # include <asm/pgtable_32.h>
440 #else
441 # include <asm/pgtable_64.h>
442 #endif
444 #ifndef __ASSEMBLY__
445 #include <linux/mm_types.h>
446 #include <linux/mmdebug.h>
447 #include <linux/log2.h>
449 static inline int pte_none(pte_t pte)
451 return !pte.pte;
454 #define __HAVE_ARCH_PTE_SAME
455 static inline int pte_same(pte_t a, pte_t b)
457 return a.pte == b.pte;
460 static inline int pte_present(pte_t a)
462 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
465 #define pte_accessible pte_accessible
466 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
468 if (pte_flags(a) & _PAGE_PRESENT)
469 return true;
471 if ((pte_flags(a) & _PAGE_PROTNONE) &&
472 mm_tlb_flush_pending(mm))
473 return true;
475 return false;
478 static inline int pte_hidden(pte_t pte)
480 return pte_flags(pte) & _PAGE_HIDDEN;
483 static inline int pmd_present(pmd_t pmd)
486 * Checking for _PAGE_PSE is needed too because
487 * split_huge_page will temporarily clear the present bit (but
488 * the _PAGE_PSE flag will remain set at all times while the
489 * _PAGE_PRESENT bit is clear).
491 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
494 #ifdef CONFIG_NUMA_BALANCING
496 * These work without NUMA balancing but the kernel does not care. See the
497 * comment in include/asm-generic/pgtable.h
499 static inline int pte_protnone(pte_t pte)
501 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
502 == _PAGE_PROTNONE;
505 static inline int pmd_protnone(pmd_t pmd)
507 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
508 == _PAGE_PROTNONE;
510 #endif /* CONFIG_NUMA_BALANCING */
512 static inline int pmd_none(pmd_t pmd)
514 /* Only check low word on 32-bit platforms, since it might be
515 out of sync with upper half. */
516 return (unsigned long)native_pmd_val(pmd) == 0;
519 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
521 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
525 * Currently stuck as a macro due to indirect forward reference to
526 * linux/mmzone.h's __section_mem_map_addr() definition:
528 #define pmd_page(pmd) \
529 pfn_to_page((pmd_val(pmd) & pmd_pfn_mask(pmd)) >> PAGE_SHIFT)
532 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
534 * this macro returns the index of the entry in the pmd page which would
535 * control the given virtual address
537 static inline unsigned long pmd_index(unsigned long address)
539 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
543 * Conversion functions: convert a page and protection to a page entry,
544 * and a page entry and page directory to the page they refer to.
546 * (Currently stuck as a macro because of indirect forward reference
547 * to linux/mm.h:page_to_nid())
549 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
552 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
554 * this function returns the index of the entry in the pte page which would
555 * control the given virtual address
557 static inline unsigned long pte_index(unsigned long address)
559 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
562 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
564 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
567 static inline int pmd_bad(pmd_t pmd)
569 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
572 static inline unsigned long pages_to_mb(unsigned long npg)
574 return npg >> (20 - PAGE_SHIFT);
577 #if CONFIG_PGTABLE_LEVELS > 2
578 static inline int pud_none(pud_t pud)
580 return native_pud_val(pud) == 0;
583 static inline int pud_present(pud_t pud)
585 return pud_flags(pud) & _PAGE_PRESENT;
588 static inline unsigned long pud_page_vaddr(pud_t pud)
590 return (unsigned long)__va(pud_val(pud) & pud_pfn_mask(pud));
594 * Currently stuck as a macro due to indirect forward reference to
595 * linux/mmzone.h's __section_mem_map_addr() definition:
597 #define pud_page(pud) \
598 pfn_to_page((pud_val(pud) & pud_pfn_mask(pud)) >> PAGE_SHIFT)
600 /* Find an entry in the second-level page table.. */
601 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
603 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
606 static inline int pud_large(pud_t pud)
608 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
609 (_PAGE_PSE | _PAGE_PRESENT);
612 static inline int pud_bad(pud_t pud)
614 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
616 #else
617 static inline int pud_large(pud_t pud)
619 return 0;
621 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
623 #if CONFIG_PGTABLE_LEVELS > 3
624 static inline int pgd_present(pgd_t pgd)
626 return pgd_flags(pgd) & _PAGE_PRESENT;
629 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
631 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
635 * Currently stuck as a macro due to indirect forward reference to
636 * linux/mmzone.h's __section_mem_map_addr() definition:
638 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
640 /* to find an entry in a page-table-directory. */
641 static inline unsigned long pud_index(unsigned long address)
643 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
646 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
648 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
651 static inline int pgd_bad(pgd_t pgd)
653 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
656 static inline int pgd_none(pgd_t pgd)
658 return !native_pgd_val(pgd);
660 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
662 #endif /* __ASSEMBLY__ */
665 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
667 * this macro returns the index of the entry in the pgd page which would
668 * control the given virtual address
670 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
673 * pgd_offset() returns a (pgd_t *)
674 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
676 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
678 * a shortcut which implies the use of the kernel's pgd, instead
679 * of a process's
681 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
684 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
685 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
687 #ifndef __ASSEMBLY__
689 extern int direct_gbpages;
690 void init_mem_mapping(void);
691 void early_alloc_pgt_buf(void);
693 /* local pte updates need not use xchg for locking */
694 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
696 pte_t res = *ptep;
698 /* Pure native function needs no input for mm, addr */
699 native_pte_clear(NULL, 0, ptep);
700 return res;
703 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
705 pmd_t res = *pmdp;
707 native_pmd_clear(pmdp);
708 return res;
711 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
712 pte_t *ptep , pte_t pte)
714 native_set_pte(ptep, pte);
717 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
718 pmd_t *pmdp , pmd_t pmd)
720 native_set_pmd(pmdp, pmd);
723 #ifndef CONFIG_PARAVIRT
725 * Rules for using pte_update - it must be called after any PTE update which
726 * has not been done using the set_pte / clear_pte interfaces. It is used by
727 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
728 * updates should either be sets, clears, or set_pte_atomic for P->P
729 * transitions, which means this hook should only be called for user PTEs.
730 * This hook implies a P->P protection or access change has taken place, which
731 * requires a subsequent TLB flush.
733 #define pte_update(mm, addr, ptep) do { } while (0)
734 #endif
737 * We only update the dirty/accessed state if we set
738 * the dirty bit by hand in the kernel, since the hardware
739 * will do the accessed bit for us, and we don't want to
740 * race with other CPU's that might be updating the dirty
741 * bit at the same time.
743 struct vm_area_struct;
745 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
746 extern int ptep_set_access_flags(struct vm_area_struct *vma,
747 unsigned long address, pte_t *ptep,
748 pte_t entry, int dirty);
750 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
751 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
752 unsigned long addr, pte_t *ptep);
754 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
755 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
756 unsigned long address, pte_t *ptep);
758 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
759 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
760 pte_t *ptep)
762 pte_t pte = native_ptep_get_and_clear(ptep);
763 pte_update(mm, addr, ptep);
764 return pte;
767 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
768 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
769 unsigned long addr, pte_t *ptep,
770 int full)
772 pte_t pte;
773 if (full) {
775 * Full address destruction in progress; paravirt does not
776 * care about updates and native needs no locking
778 pte = native_local_ptep_get_and_clear(ptep);
779 } else {
780 pte = ptep_get_and_clear(mm, addr, ptep);
782 return pte;
785 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
786 static inline void ptep_set_wrprotect(struct mm_struct *mm,
787 unsigned long addr, pte_t *ptep)
789 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
790 pte_update(mm, addr, ptep);
793 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
795 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
797 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
798 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
799 unsigned long address, pmd_t *pmdp,
800 pmd_t entry, int dirty);
802 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
803 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
804 unsigned long addr, pmd_t *pmdp);
806 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
807 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
808 unsigned long address, pmd_t *pmdp);
811 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
812 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
813 unsigned long addr, pmd_t *pmdp);
815 #define __HAVE_ARCH_PMD_WRITE
816 static inline int pmd_write(pmd_t pmd)
818 return pmd_flags(pmd) & _PAGE_RW;
821 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
822 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
823 pmd_t *pmdp)
825 return native_pmdp_get_and_clear(pmdp);
828 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
829 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
830 unsigned long addr, pmd_t *pmdp)
832 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
836 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
838 * dst - pointer to pgd range anwhere on a pgd page
839 * src - ""
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);
892 #endif
894 #include <asm-generic/pgtable.h>
895 #endif /* __ASSEMBLY__ */
897 #endif /* _ASM_X86_PGTABLE_H */