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 #define set_pte(ptep, pte) xen_set_pte(ptep, pte)
34 #define set_pte_at(mm, addr, ptep, pte) xen_set_pte_at(mm, addr, ptep, pte)
35 #define set_pmd_at(mm, addr, pmdp, pmd) xen_set_pmd_at(mm, addr, pmdp, pmd)
37 #define set_pmd(pmdp, pmd) xen_set_pmd(pmdp, pmd)
39 #ifndef __PAGETABLE_PUD_FOLDED
40 #define set_pgd(pgdp, pgd) xen_set_pgd(pgdp, pgd)
41 #define pgd_clear(pgd) xen_pgd_clear(pgd)
45 # define set_pud(pudp, pud) xen_set_pud(pudp, pud)
48 #ifndef __PAGETABLE_PMD_FOLDED
49 #define pud_clear(pud) xen_pud_clear(pud)
52 #define pte_clear(mm, addr, ptep) xen_pte_clear(mm, addr, ptep)
53 #define pmd_clear(pmd) xen_pmd_clear(pmd)
55 #define pte_update(mm, addr, ptep) do { } while (0)
56 #define pte_update_defer(mm, addr, ptep) do { } while (0)
57 #define pmd_update(mm, addr, ptep) do { } while (0)
58 #define pmd_update_defer(mm, addr, ptep) do { } while (0)
60 #define pgd_val(x) xen_pgd_val(x)
61 #define __pgd(x) xen_make_pgd(x)
63 #ifndef __PAGETABLE_PUD_FOLDED
64 #define pud_val(x) xen_pud_val(x)
65 #define __pud(x) xen_make_pud(x)
68 #ifndef __PAGETABLE_PMD_FOLDED
69 #define pmd_val(x) xen_pmd_val(x)
70 #define __pmd(x) xen_make_pmd(x)
73 #define pte_val(x) xen_pte_val(x)
74 #define __pte(x) xen_make_pte(x)
76 #define arch_end_context_switch(prev) do {} while(0)
79 * The following only work if pte_present() is true.
80 * Undefined behaviour if not..
82 static inline int pte_dirty(pte_t pte)
84 return pte_flags(pte) & _PAGE_DIRTY;
87 static inline int pte_young(pte_t pte)
89 return pte_flags(pte) & _PAGE_ACCESSED;
92 static inline int pmd_young(pmd_t pmd)
94 return pmd_flags(pmd) & _PAGE_ACCESSED;
97 static inline int pte_write(pte_t pte)
99 return pte_flags(pte) & _PAGE_RW;
102 static inline int pte_file(pte_t pte)
104 return pte_flags(pte) & _PAGE_FILE;
107 static inline int pte_huge(pte_t pte)
109 return pte_flags(pte) & _PAGE_PSE;
112 static inline int pte_global(pte_t pte)
117 static inline int pte_exec(pte_t pte)
119 return !(pte_flags(pte) & _PAGE_NX);
122 static inline int pte_special(pte_t pte)
124 return pte_flags(pte) & _PAGE_SPECIAL;
127 #define pte_mfn(_pte) ((_pte).pte_low & _PAGE_PRESENT ? \
128 __pte_mfn(_pte) : pfn_to_mfn(__pte_mfn(_pte)))
129 #define pte_pfn(_pte) ((_pte).pte_low & _PAGE_IOMAP ? max_mapnr : \
130 (_pte).pte_low & _PAGE_PRESENT ? \
131 mfn_to_local_pfn(__pte_mfn(_pte)) : \
134 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
136 static inline unsigned long pmd_pfn(pmd_t pmd)
138 return (pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT;
141 static inline int pmd_large(pmd_t pte)
143 return (pmd_flags(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
144 (_PAGE_PSE | _PAGE_PRESENT);
147 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
148 static inline int pmd_trans_splitting(pmd_t pmd)
150 return pmd_val(pmd) & _PAGE_SPLITTING;
153 static inline int pmd_trans_huge(pmd_t pmd)
155 return pmd_val(pmd) & _PAGE_PSE;
158 static inline int has_transparent_hugepage(void)
162 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
164 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
166 pteval_t v = __pte_val(pte);
168 return __pte_ma(v | set);
171 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
173 pteval_t v = __pte_val(pte);
175 return __pte_ma(v & ~clear);
178 static inline pte_t pte_mkclean(pte_t pte)
180 return pte_clear_flags(pte, _PAGE_DIRTY);
183 static inline pte_t pte_mkold(pte_t pte)
185 return pte_clear_flags(pte, _PAGE_ACCESSED);
188 static inline pte_t pte_wrprotect(pte_t pte)
190 return pte_clear_flags(pte, _PAGE_RW);
193 static inline pte_t pte_mkexec(pte_t pte)
195 return pte_clear_flags(pte, _PAGE_NX);
198 static inline pte_t pte_mkdirty(pte_t pte)
200 return pte_set_flags(pte, _PAGE_DIRTY);
203 static inline pte_t pte_mkyoung(pte_t pte)
205 return pte_set_flags(pte, _PAGE_ACCESSED);
208 static inline pte_t pte_mkwrite(pte_t pte)
210 return pte_set_flags(pte, _PAGE_RW);
213 static inline pte_t pte_mkhuge(pte_t pte)
215 return pte_set_flags(pte, _PAGE_PSE);
218 static inline pte_t pte_clrhuge(pte_t pte)
220 return pte_clear_flags(pte, _PAGE_PSE);
223 static inline pte_t pte_mkglobal(pte_t pte)
228 static inline pte_t pte_clrglobal(pte_t pte)
233 static inline pte_t pte_mkspecial(pte_t pte)
235 return pte_set_flags(pte, _PAGE_SPECIAL);
238 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
239 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
241 pmdval_t v = native_pmd_val(pmd);
243 return __pmd(v | set);
246 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
248 pmdval_t v = native_pmd_val(pmd);
250 return __pmd(v & ~clear);
253 static inline pmd_t pmd_mkold(pmd_t pmd)
255 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
258 static inline pmd_t pmd_wrprotect(pmd_t pmd)
260 return pmd_clear_flags(pmd, _PAGE_RW);
263 static inline pmd_t pmd_mkdirty(pmd_t pmd)
265 return pmd_set_flags(pmd, _PAGE_DIRTY);
268 static inline pmd_t pmd_mkhuge(pmd_t pmd)
270 return pmd_set_flags(pmd, _PAGE_PSE);
273 static inline pmd_t pmd_mkyoung(pmd_t pmd)
275 return pmd_set_flags(pmd, _PAGE_ACCESSED);
278 static inline pmd_t pmd_mkwrite(pmd_t pmd)
280 return pmd_set_flags(pmd, _PAGE_RW);
283 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
285 return pmd_clear_flags(pmd, _PAGE_PRESENT);
290 * Mask out unsupported bits in a present pgprot. Non-present pgprots
291 * can use those bits for other purposes, so leave them be.
293 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
295 pgprotval_t protval = pgprot_val(pgprot);
297 if (protval & _PAGE_PRESENT)
298 protval &= __supported_pte_mask;
303 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
305 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
306 massage_pgprot(pgprot));
309 static inline pte_t pfn_pte_ma(phys_addr_t page_nr, pgprot_t pgprot)
311 return __pte_ma((page_nr << PAGE_SHIFT) | massage_pgprot(pgprot));
314 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
316 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
317 massage_pgprot(pgprot));
320 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
322 pteval_t val = pte_val(pte) & _PAGE_CHG_MASK;
324 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
329 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
330 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
332 pmdval_t val = pmd_val(pmd);
334 val &= _HPAGE_CHG_MASK;
335 val |= massage_pgprot(newprot) & ~_HPAGE_CHG_MASK;
341 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
342 #define pgprot_modify pgprot_modify
343 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
345 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
346 pgprotval_t addbits = pgprot_val(newprot);
347 return __pgprot(preservebits | addbits);
350 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
352 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
354 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
356 unsigned long new_flags)
359 * PAT type is always WB for untracked ranges, so no need to check.
361 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
365 * Certain new memtypes are not allowed with certain
367 * - request is uncached, return cannot be write-back
368 * - request is write-combine, return cannot be write-back
370 if ((flags == _PAGE_CACHE_UC_MINUS &&
371 new_flags == _PAGE_CACHE_WB) ||
372 (flags == _PAGE_CACHE_WC &&
373 new_flags == _PAGE_CACHE_WB)) {
380 pmd_t *populate_extra_pmd(unsigned long vaddr);
381 pte_t *populate_extra_pte(unsigned long vaddr);
382 #endif /* __ASSEMBLY__ */
385 # include "pgtable_32.h"
387 # include "pgtable_64.h"
391 #include <linux/mm_types.h>
393 static inline int pte_none(pte_t pte)
398 #define __HAVE_ARCH_PTE_SAME
399 static inline int pte_same(pte_t a, pte_t b)
401 return a.pte == b.pte;
404 static inline int pte_present(pte_t a)
406 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
409 static inline int pte_hidden(pte_t pte)
411 return pte_flags(pte) & _PAGE_HIDDEN;
414 static inline int pmd_present(pmd_t pmd)
416 #if CONFIG_XEN_COMPAT <= 0x030002
417 /* pmd_present doesn't just test the _PAGE_PRESENT bit since wr.p.t.
418 can temporarily clear it. */
419 return __pmd_val(pmd) != 0;
421 return pmd_flags(pmd) & _PAGE_PRESENT;
425 static inline int pmd_none(pmd_t pmd)
427 /* Only check low word on 32-bit platforms, since it might be
428 out of sync with upper half. */
429 return (unsigned long)__pmd_val(pmd) == 0;
432 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
434 return (unsigned long)__va(pmd_val(pmd) & PTE_PFN_MASK);
438 * Currently stuck as a macro due to indirect forward reference to
439 * linux/mmzone.h's __section_mem_map_addr() definition:
441 #define pmd_page(pmd) pfn_to_page((pmd_val(pmd) & PTE_PFN_MASK) >> PAGE_SHIFT)
444 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
446 * this macro returns the index of the entry in the pmd page which would
447 * control the given virtual address
449 static inline unsigned long pmd_index(unsigned long address)
451 return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
455 * Conversion functions: convert a page and protection to a page entry,
456 * and a page entry and page directory to the page they refer to.
458 * (Currently stuck as a macro because of indirect forward reference
459 * to linux/mm.h:page_to_nid())
461 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
464 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
466 * this function returns the index of the entry in the pte page which would
467 * control the given virtual address
469 static inline unsigned long pte_index(unsigned long address)
471 return (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
474 static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address)
476 return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(address);
479 static inline int pmd_bad(pmd_t pmd)
481 #if CONFIG_XEN_COMPAT <= 0x030002
482 return (pmd_flags(pmd) & ~_PAGE_USER & ~_PAGE_PRESENT)
483 != (_KERNPG_TABLE & ~_PAGE_PRESENT);
485 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
489 static inline unsigned long pages_to_mb(unsigned long npg)
491 return npg >> (20 - PAGE_SHIFT);
494 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
495 direct_remap_pfn_range(vma, vaddr, pfn, size, prot, DOMID_IO)
497 #if PAGETABLE_LEVELS > 2
498 static inline int pud_none(pud_t pud)
500 return __pud_val(pud) == 0;
503 static inline int pud_present(pud_t pud)
505 return pud_flags(pud) & _PAGE_PRESENT;
508 static inline unsigned long pud_page_vaddr(pud_t pud)
510 return (unsigned long)__va((unsigned long)pud_val(pud) & PTE_PFN_MASK);
514 * Currently stuck as a macro due to indirect forward reference to
515 * linux/mmzone.h's __section_mem_map_addr() definition:
517 #define pud_page(pud) pfn_to_page(pud_val(pud) >> PAGE_SHIFT)
519 /* Find an entry in the second-level page table.. */
520 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
522 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
525 static inline int pud_large(pud_t pud)
527 return (__pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
528 (_PAGE_PSE | _PAGE_PRESENT);
531 static inline int pud_bad(pud_t pud)
533 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
536 static inline int pud_large(pud_t pud)
540 #endif /* PAGETABLE_LEVELS > 2 */
542 #if PAGETABLE_LEVELS > 3
543 static inline int pgd_present(pgd_t pgd)
545 return pgd_flags(pgd) & _PAGE_PRESENT;
548 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
550 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
554 * Currently stuck as a macro due to indirect forward reference to
555 * linux/mmzone.h's __section_mem_map_addr() definition:
557 #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT)
559 /* to find an entry in a page-table-directory. */
560 static inline unsigned long pud_index(unsigned long address)
562 return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
565 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
567 return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
570 static inline int pgd_bad(pgd_t pgd)
572 return (pgd_flags(pgd) & ~_PAGE_USER) != _KERNPG_TABLE;
575 static inline int pgd_none(pgd_t pgd)
577 return !__pgd_val(pgd);
579 #endif /* PAGETABLE_LEVELS > 3 */
581 #endif /* __ASSEMBLY__ */
584 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
586 * this macro returns the index of the entry in the pgd page which would
587 * control the given virtual address
589 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
592 * pgd_offset() returns a (pgd_t *)
593 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
595 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
597 * a shortcut which implies the use of the kernel's pgd, instead
600 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
603 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
604 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
608 #define direct_gbpages 0
610 /* local pte updates need not use xchg for locking */
611 static inline pte_t xen_local_ptep_get_and_clear(pte_t *ptep, pte_t res)
613 xen_set_pte(ptep, __pte(0));
617 static inline pmd_t xen_local_pmdp_get_and_clear(pmd_t *pmdp)
621 xen_set_pmd(pmdp, __pmd(0));
625 static inline void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
626 pte_t *ptep , pte_t pte)
628 if ((mm != current->mm && mm != &init_mm) ||
629 HYPERVISOR_update_va_mapping(addr, pte, 0))
630 xen_set_pte(ptep, pte);
633 static inline void xen_set_pmd_at(struct mm_struct *mm, unsigned long addr,
634 pmd_t *pmdp , pmd_t pmd)
636 xen_set_pmd(pmdp, pmd);
639 static inline void xen_pte_clear(struct mm_struct *mm, unsigned long addr,
642 if ((mm != current->mm && mm != &init_mm)
643 || HYPERVISOR_update_va_mapping(addr, __pte(0), 0))
644 __xen_pte_clear(ptep);
647 #ifndef CONFIG_PARAVIRT
649 * Rules for using pte_update - it must be called after any PTE update which
650 * has not been done using the set_pte / clear_pte interfaces. It is used by
651 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
652 * updates should either be sets, clears, or set_pte_atomic for P->P
653 * transitions, which means this hook should only be called for user PTEs.
654 * This hook implies a P->P protection or access change has taken place, which
655 * requires a subsequent TLB flush. The notification can optionally be delayed
656 * until the TLB flush event by using the pte_update_defer form of the
657 * interface, but care must be taken to assure that the flush happens while
658 * still holding the same page table lock so that the shadow and primary pages
659 * do not become out of sync on SMP.
661 #define pte_update(mm, addr, ptep) do { } while (0)
662 #define pte_update_defer(mm, addr, ptep) do { } while (0)
666 * We only update the dirty/accessed state if we set
667 * the dirty bit by hand in the kernel, since the hardware
668 * will do the accessed bit for us, and we don't want to
669 * race with other CPU's that might be updating the dirty
670 * bit at the same time.
672 struct vm_area_struct;
674 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
675 extern int ptep_set_access_flags(struct vm_area_struct *vma,
676 unsigned long address, pte_t *ptep,
677 pte_t entry, int dirty);
679 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
680 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
681 unsigned long addr, pte_t *ptep);
683 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
684 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
685 unsigned long address, pte_t *ptep);
687 #define __HAVE_ARCH_PTEP_CLEAR_FLUSH
688 #define ptep_clear_flush(vma, addr, ptep) \
690 pte_t *__ptep = (ptep); \
691 pte_t __res = *__ptep; \
692 if (!pte_none(__res) && \
693 ((vma)->vm_mm != current->mm || \
694 HYPERVISOR_update_va_mapping(addr, __pte(0), \
695 uvm_multi(mm_cpumask((vma)->vm_mm)) | \
697 __xen_pte_clear(__ptep); \
698 flush_tlb_page(vma, addr); \
703 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
704 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
710 || HYPERVISOR_update_va_mapping(addr, __pte(0), 0))) {
711 pte = xen_ptep_get_and_clear(ptep, pte);
712 pte_update(mm, addr, ptep);
717 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
718 #define ptep_get_and_clear_full(mm, addr, ptep, full) \
720 pte_t *__ptep = (ptep); \
721 pte_t __res = *__ptep; \
722 if (!PagePinned(virt_to_page((mm)->pgd))) \
723 __xen_pte_clear(__ptep); \
724 else if (!pte_none(__res)) \
725 xen_l1_entry_update(__ptep, __pte(0)); \
728 ptep_get_and_clear(mm, addr, ptep))
730 pte_t xen_ptep_get_and_clear_full(struct vm_area_struct *, unsigned long, pte_t *, int);
732 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
733 static inline void ptep_set_wrprotect(struct mm_struct *mm,
734 unsigned long addr, pte_t *ptep)
738 set_pte_at(mm, addr, ptep, pte_wrprotect(pte));
741 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
743 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
745 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
746 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
747 unsigned long address, pmd_t *pmdp,
748 pmd_t entry, int dirty);
750 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
751 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
752 unsigned long addr, pmd_t *pmdp);
754 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
755 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
756 unsigned long address, pmd_t *pmdp);
759 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
760 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
761 unsigned long addr, pmd_t *pmdp);
763 #define __HAVE_ARCH_PMD_WRITE
764 static inline int pmd_write(pmd_t pmd)
766 return pmd_flags(pmd) & _PAGE_RW;
769 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
770 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
771 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
774 pmd_t pmd = xen_pmdp_get_and_clear(pmdp);
775 pmd_update(mm, addr, pmdp);
780 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
781 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
782 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
783 unsigned long addr, pmd_t *pmdp)
785 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
786 pmd_update(mm, addr, pmdp);
791 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
793 * dst - pointer to pgd range anwhere on a pgd page
795 * count - the number of pgds to copy.
797 * dst and src can be on the same page, but the range must not overlap,
798 * and must not cross a page boundary.
800 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
802 memcpy(dst, src, count * sizeof(pgd_t));
805 #define arbitrary_virt_to_mfn(va) \
807 unsigned int __lvl; \
808 pte_t *__ptep = lookup_address((unsigned long)(va), &__lvl); \
809 BUG_ON(!__ptep || __lvl != PG_LEVEL_4K || !pte_present(*__ptep));\
813 #define arbitrary_virt_to_machine(va) \
814 (((maddr_t)arbitrary_virt_to_mfn(va) << PAGE_SHIFT) \
815 | ((unsigned long)(va) & (PAGE_SIZE - 1)))
817 #ifdef CONFIG_HIGHPTE
819 struct page *kmap_atomic_to_page(void *);
820 #define ptep_to_machine(ptep) \
822 pte_t *__ptep = (ptep); \
823 page_to_phys(kmap_atomic_to_page(__ptep)) \
824 | ((unsigned long)__ptep & (PAGE_SIZE - 1)); \
827 #define ptep_to_machine(ptep) virt_to_machine(ptep)
830 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
831 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
834 #if CONFIG_XEN_COMPAT < 0x030300
835 if (unlikely(!xen_feature(XENFEAT_mmu_pt_update_preserve_ad)))
836 return ptep_get_and_clear(mm, addr, ptep);
841 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
842 pte_t *ptep, pte_t pte)
846 #if CONFIG_XEN_COMPAT < 0x030300
847 if (unlikely(!xen_feature(XENFEAT_mmu_pt_update_preserve_ad))) {
848 set_pte_at(mm, addr, ptep, pte);
852 u.ptr = ptep_to_machine(ptep) | MMU_PT_UPDATE_PRESERVE_AD;
853 u.val = __pte_val(pte);
854 if (HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF))
858 #include <asm-generic/pgtable.h>
860 #include <xen/features.h>
861 void make_page_readonly(void *va, unsigned int feature);
862 void make_page_writable(void *va, unsigned int feature);
863 void make_pages_readonly(void *va, unsigned int nr, unsigned int feature);
864 void make_pages_writable(void *va, unsigned int nr, unsigned int feature);
866 struct vm_area_struct;
868 int direct_remap_pfn_range(struct vm_area_struct *vma,
869 unsigned long address,
874 int direct_kernel_remap_pfn_range(unsigned long address,
879 int create_lookup_pte_addr(struct mm_struct *mm,
880 unsigned long address,
883 #endif /* __ASSEMBLY__ */
885 #endif /* _ASM_X86_PGTABLE_H */