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 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
147 static inline int pmd_large(pmd_t pte)
149 return pmd_flags(pte) & _PAGE_PSE;
152 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
153 static inline int pmd_trans_splitting(pmd_t pmd)
155 return pmd_val(pmd) & _PAGE_SPLITTING;
158 static inline int pmd_trans_huge(pmd_t pmd)
160 return pmd_val(pmd) & _PAGE_PSE;
163 static inline int has_transparent_hugepage(void)
167 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
169 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
171 pteval_t v = native_pte_val(pte);
173 return native_make_pte(v | set);
176 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
178 pteval_t v = native_pte_val(pte);
180 return native_make_pte(v & ~clear);
183 static inline pte_t pte_mkclean(pte_t pte)
185 return pte_clear_flags(pte, _PAGE_DIRTY);
188 static inline pte_t pte_mkold(pte_t pte)
190 return pte_clear_flags(pte, _PAGE_ACCESSED);
193 static inline pte_t pte_wrprotect(pte_t pte)
195 return pte_clear_flags(pte, _PAGE_RW);
198 static inline pte_t pte_mkexec(pte_t pte)
200 return pte_clear_flags(pte, _PAGE_NX);
203 static inline pte_t pte_mkdirty(pte_t pte)
205 return pte_set_flags(pte, _PAGE_DIRTY);
208 static inline pte_t pte_mkyoung(pte_t pte)
210 return pte_set_flags(pte, _PAGE_ACCESSED);
213 static inline pte_t pte_mkwrite(pte_t pte)
215 return pte_set_flags(pte, _PAGE_RW);
218 static inline pte_t pte_mkhuge(pte_t pte)
220 return pte_set_flags(pte, _PAGE_PSE);
223 static inline pte_t pte_clrhuge(pte_t pte)
225 return pte_clear_flags(pte, _PAGE_PSE);
228 static inline pte_t pte_mkglobal(pte_t pte)
230 return pte_set_flags(pte, _PAGE_GLOBAL);
233 static inline pte_t pte_clrglobal(pte_t pte)
235 return pte_clear_flags(pte, _PAGE_GLOBAL);
238 static inline pte_t pte_mkspecial(pte_t pte)
240 return pte_set_flags(pte, _PAGE_SPECIAL);
243 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
245 pmdval_t v = native_pmd_val(pmd);
247 return __pmd(v | set);
250 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
252 pmdval_t v = native_pmd_val(pmd);
254 return __pmd(v & ~clear);
257 static inline pmd_t pmd_mkold(pmd_t pmd)
259 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
262 static inline pmd_t pmd_wrprotect(pmd_t pmd)
264 return pmd_clear_flags(pmd, _PAGE_RW);
267 static inline pmd_t pmd_mkdirty(pmd_t pmd)
269 return pmd_set_flags(pmd, _PAGE_DIRTY);
272 static inline pmd_t pmd_mkhuge(pmd_t pmd)
274 return pmd_set_flags(pmd, _PAGE_PSE);
277 static inline pmd_t pmd_mkyoung(pmd_t pmd)
279 return pmd_set_flags(pmd, _PAGE_ACCESSED);
282 static inline pmd_t pmd_mkwrite(pmd_t pmd)
284 return pmd_set_flags(pmd, _PAGE_RW);
287 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
289 return pmd_clear_flags(pmd, _PAGE_PRESENT);
293 * Mask out unsupported bits in a present pgprot. Non-present pgprots
294 * can use those bits for other purposes, so leave them be.
296 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
298 pgprotval_t protval = pgprot_val(pgprot);
300 if (protval & _PAGE_PRESENT)
301 protval &= __supported_pte_mask;
306 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
308 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
309 massage_pgprot(pgprot));
312 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
314 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
315 massage_pgprot(pgprot));
318 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
320 pteval_t val = pte_val(pte);
323 * Chop off the NX bit (if present), and add the NX portion of
324 * the newprot (if present):
326 val &= _PAGE_CHG_MASK;
327 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
332 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
334 pmdval_t val = pmd_val(pmd);
336 val &= _HPAGE_CHG_MASK;
337 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
342 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
343 #define pgprot_modify pgprot_modify
344 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
346 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
347 pgprotval_t addbits = pgprot_val(newprot);
348 return __pgprot(preservebits | addbits);
351 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
353 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
355 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
357 unsigned long new_flags)
360 * PAT type is always WB for untracked ranges, so no need to check.
362 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
366 * Certain new memtypes are not allowed with certain
368 * - request is uncached, return cannot be write-back
369 * - request is write-combine, return cannot be write-back
371 if ((flags == _PAGE_CACHE_UC_MINUS &&
372 new_flags == _PAGE_CACHE_WB) ||
373 (flags == _PAGE_CACHE_WC &&
374 new_flags == _PAGE_CACHE_WB)) {
381 pmd_t *populate_extra_pmd(unsigned long vaddr);
382 pte_t *populate_extra_pte(unsigned long vaddr);
383 #endif /* __ASSEMBLY__ */
386 # include <asm/pgtable_32.h>
388 # include <asm/pgtable_64.h>
392 #include <linux/mm_types.h>
394 static inline int pte_none(pte_t pte)
399 #define __HAVE_ARCH_PTE_SAME
400 static inline int pte_same(pte_t a, pte_t b)
402 return a.pte == b.pte;
405 static inline int pte_present(pte_t a)
407 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
410 static inline int pte_hidden(pte_t pte)
412 return pte_flags(pte) & _PAGE_HIDDEN;
415 static inline int pmd_present(pmd_t pmd)
418 * Checking for _PAGE_PSE is needed too because
419 * split_huge_page will temporarily clear the present bit (but
420 * the _PAGE_PSE flag will remain set at all times while the
421 * _PAGE_PRESENT bit is clear).
423 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
426 static inline int pmd_none(pmd_t pmd)
428 /* Only check low word on 32-bit platforms, since it might be
429 out of sync with upper half. */
430 return (unsigned long)native_pmd_val(pmd) == 0;
433 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
435 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
439 * Currently stuck as a macro due to indirect forward reference to
440 * linux/mmzone.h's __section_mem_map_addr() definition:
442 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
445 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
447 * this macro returns the index of the entry in the pmd page which would
448 * control the given virtual address
450 static inline unsigned long pmd_index(unsigned long address)
452 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
456 * Conversion functions: convert a page and protection to a page entry,
457 * and a page entry and page directory to the page they refer to.
459 * (Currently stuck as a macro because of indirect forward reference
460 * to linux/mm.h:page_to_nid())
462 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
465 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
467 * this function returns the index of the entry in the pte page which would
468 * control the given virtual address
470 static inline unsigned long pte_index(unsigned long address)
472 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
475 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
477 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
480 static inline int pmd_bad(pmd_t pmd)
482 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
485 static inline unsigned long pages_to_mb(unsigned long npg)
487 return npg >> (20 - PAGE_SHIFT);
490 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
491 remap_pfn_range(vma, vaddr, pfn, size, prot)
493 #if PAGETABLE_LEVELS > 2
494 static inline int pud_none(pud_t pud)
496 return native_pud_val(pud) == 0;
499 static inline int pud_present(pud_t pud)
501 return pud_flags(pud) & _PAGE_PRESENT;
504 static inline unsigned long pud_page_vaddr(pud_t pud)
506 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
510 * Currently stuck as a macro due to indirect forward reference to
511 * linux/mmzone.h's __section_mem_map_addr() definition:
513 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
515 /* Find an entry in the second-level page table.. */
516 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
518 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
521 static inline int pud_large(pud_t pud)
523 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
524 (_PAGE_PSE | _PAGE_PRESENT);
527 static inline int pud_bad(pud_t pud)
529 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
532 static inline int pud_large(pud_t pud)
536 #endif /* PAGETABLE_LEVELS > 2 */
538 #if PAGETABLE_LEVELS > 3
539 static inline int pgd_present(pgd_t pgd)
541 return pgd_flags(pgd) & _PAGE_PRESENT;
544 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
546 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
550 * Currently stuck as a macro due to indirect forward reference to
551 * linux/mmzone.h's __section_mem_map_addr() definition:
553 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
555 /* to find an entry in a page-table-directory. */
556 static inline unsigned long pud_index(unsigned long address)
558 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
561 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
563 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
566 static inline int pgd_bad(pgd_t pgd)
568 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
571 static inline int pgd_none(pgd_t pgd)
573 return !native_pgd_val(pgd);
575 #endif /* PAGETABLE_LEVELS > 3 */
577 #endif /* __ASSEMBLY__ */
580 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
582 * this macro returns the index of the entry in the pgd page which would
583 * control the given virtual address
585 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
588 * pgd_offset() returns a (pgd_t *)
589 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
591 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
593 * a shortcut which implies the use of the kernel's pgd, instead
596 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
599 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
600 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
604 extern int direct_gbpages;
605 void init_mem_mapping(void);
606 void early_alloc_pgt_buf(void);
608 /* local pte updates need not use xchg for locking */
609 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
613 /* Pure native function needs no input for mm, addr */
614 native_pte_clear(NULL, 0, ptep);
618 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
622 native_pmd_clear(pmdp);
626 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
627 pte_t *ptep , pte_t pte)
629 native_set_pte(ptep, pte);
632 static inline void native_set_pmd_at(struct mm_struct *mm, unsigned long addr,
633 pmd_t *pmdp , pmd_t pmd)
635 native_set_pmd(pmdp, pmd);
638 #ifndef CONFIG_PARAVIRT
640 * Rules for using pte_update - it must be called after any PTE update which
641 * has not been done using the set_pte / clear_pte interfaces. It is used by
642 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
643 * updates should either be sets, clears, or set_pte_atomic for P->P
644 * transitions, which means this hook should only be called for user PTEs.
645 * This hook implies a P->P protection or access change has taken place, which
646 * requires a subsequent TLB flush. The notification can optionally be delayed
647 * until the TLB flush event by using the pte_update_defer form of the
648 * interface, but care must be taken to assure that the flush happens while
649 * still holding the same page table lock so that the shadow and primary pages
650 * do not become out of sync on SMP.
652 #define pte_update(mm, addr, ptep) do { } while (0)
653 #define pte_update_defer(mm, addr, ptep) do { } while (0)
657 * We only update the dirty/accessed state if we set
658 * the dirty bit by hand in the kernel, since the hardware
659 * will do the accessed bit for us, and we don't want to
660 * race with other CPU's that might be updating the dirty
661 * bit at the same time.
663 struct vm_area_struct;
665 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
666 extern int ptep_set_access_flags(struct vm_area_struct *vma,
667 unsigned long address, pte_t *ptep,
668 pte_t entry, int dirty);
670 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
671 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
672 unsigned long addr, pte_t *ptep);
674 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
675 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
676 unsigned long address, pte_t *ptep);
678 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
679 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
682 pte_t pte = native_ptep_get_and_clear(ptep);
683 pte_update(mm, addr, ptep);
687 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
688 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
689 unsigned long addr, pte_t *ptep,
695 * Full address destruction in progress; paravirt does not
696 * care about updates and native needs no locking
698 pte = native_local_ptep_get_and_clear(ptep);
700 pte = ptep_get_and_clear(mm, addr, ptep);
705 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
706 static inline void ptep_set_wrprotect(struct mm_struct *mm,
707 unsigned long addr, pte_t *ptep)
709 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
710 pte_update(mm, addr, ptep);
713 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
715 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
717 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
718 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
719 unsigned long address, pmd_t *pmdp,
720 pmd_t entry, int dirty);
722 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
723 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
724 unsigned long addr, pmd_t *pmdp);
726 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
727 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
728 unsigned long address, pmd_t *pmdp);
731 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
732 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
733 unsigned long addr, pmd_t *pmdp);
735 #define __HAVE_ARCH_PMD_WRITE
736 static inline int pmd_write(pmd_t pmd)
738 return pmd_flags(pmd) & _PAGE_RW;
741 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
742 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
745 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
746 pmd_update(mm, addr, pmdp);
750 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
751 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
752 unsigned long addr, pmd_t *pmdp)
754 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
755 pmd_update(mm, addr, pmdp);
759 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
761 * dst - pointer to pgd range anwhere on a pgd page
763 * count - the number of pgds to copy.
765 * dst and src can be on the same page, but the range must not overlap,
766 * and must not cross a page boundary.
768 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
770 memcpy(dst, src, count * sizeof(pgd_t));
774 #include <asm-generic/pgtable.h>
775 #endif /* __ASSEMBLY__ */
777 #endif /* _ASM_X86_PGTABLE_H */