1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
4 #define FIRST_USER_ADDRESS 0
6 #define _PAGE_BIT_PRESENT 0 /* is present */
7 #define _PAGE_BIT_RW 1 /* writeable */
8 #define _PAGE_BIT_USER 2 /* userspace addressable */
9 #define _PAGE_BIT_PWT 3 /* page write through */
10 #define _PAGE_BIT_PCD 4 /* page cache disabled */
11 #define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
12 #define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
13 #define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
14 #define _PAGE_BIT_PAT 7 /* on 4KB pages */
15 #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
16 #define _PAGE_BIT_UNUSED1 9 /* available for programmer */
17 #define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */
18 #define _PAGE_BIT_UNUSED3 11
19 #define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
20 #define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
21 #define _PAGE_BIT_CPA_TEST _PAGE_BIT_UNUSED1
22 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
24 /* If _PAGE_BIT_PRESENT is clear, we use these: */
25 /* - if the user mapped it with PROT_NONE; pte_present gives true */
26 #define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL
27 /* - set: nonlinear file mapping, saved PTE; unset:swap */
28 #define _PAGE_BIT_FILE _PAGE_BIT_DIRTY
30 #define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
31 #define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
32 #define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
33 #define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
34 #define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
35 #define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
36 #define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
37 #define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
38 #define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
39 #define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
40 #define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
41 #define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
42 #define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
43 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
44 #define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
45 #define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
46 #define __HAVE_ARCH_PTE_SPECIAL
48 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
49 #define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
51 #define _PAGE_NX (_AT(pteval_t, 0))
54 #define _PAGE_FILE (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
55 #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
57 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
58 _PAGE_ACCESSED | _PAGE_DIRTY)
59 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
62 /* Set of bits not changed in pte_modify */
63 #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
64 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY)
66 #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
67 #define _PAGE_CACHE_WB (0)
68 #define _PAGE_CACHE_WC (_PAGE_PWT)
69 #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
70 #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
72 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
73 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
74 _PAGE_ACCESSED | _PAGE_NX)
76 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
77 _PAGE_USER | _PAGE_ACCESSED)
78 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
79 _PAGE_ACCESSED | _PAGE_NX)
80 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
82 #define PAGE_COPY PAGE_COPY_NOEXEC
83 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
84 _PAGE_ACCESSED | _PAGE_NX)
85 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
88 #define __PAGE_KERNEL_EXEC \
89 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
90 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
92 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
93 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
94 #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
95 #define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
96 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
97 #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
98 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
99 #define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
100 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
101 #define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
102 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
104 #define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
105 #define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
106 #define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
107 #define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
109 #define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
110 #define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
111 #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
112 #define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
113 #define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
114 #define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
115 #define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
116 #define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
117 #define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
118 #define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
119 #define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
120 #define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
121 #define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
123 #define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
124 #define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
125 #define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
126 #define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
129 #define __P000 PAGE_NONE
130 #define __P001 PAGE_READONLY
131 #define __P010 PAGE_COPY
132 #define __P011 PAGE_COPY
133 #define __P100 PAGE_READONLY_EXEC
134 #define __P101 PAGE_READONLY_EXEC
135 #define __P110 PAGE_COPY_EXEC
136 #define __P111 PAGE_COPY_EXEC
138 #define __S000 PAGE_NONE
139 #define __S001 PAGE_READONLY
140 #define __S010 PAGE_SHARED
141 #define __S011 PAGE_SHARED
142 #define __S100 PAGE_READONLY_EXEC
143 #define __S101 PAGE_READONLY_EXEC
144 #define __S110 PAGE_SHARED_EXEC
145 #define __S111 PAGE_SHARED_EXEC
148 * early identity mapping pte attrib macros.
151 #define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
154 * For PDE_IDENT_ATTR include USER bit. As the PDE and PTE protection
155 * bits are combined, this will alow user to access the high address mapped
156 * VDSO in the presence of CONFIG_COMPAT_VDSO
158 #define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
159 #define PDE_IDENT_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */
160 #define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
164 * Macro to mark a page protection value as UC-
166 #define pgprot_noncached(prot) \
167 ((boot_cpu_data.x86 > 3) \
168 ? (__pgprot(pgprot_val(prot) | _PAGE_CACHE_UC_MINUS)) \
173 #define pgprot_writecombine pgprot_writecombine
174 extern pgprot_t pgprot_writecombine(pgprot_t prot);
177 * ZERO_PAGE is a global shared page that is always zero: used
178 * for zero-mapped memory areas etc..
180 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
181 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
183 extern spinlock_t pgd_lock;
184 extern struct list_head pgd_list;
187 * The following only work if pte_present() is true.
188 * Undefined behaviour if not..
190 static inline int pte_dirty(pte_t pte)
192 return pte_flags(pte) & _PAGE_DIRTY;
195 static inline int pte_young(pte_t pte)
197 return pte_flags(pte) & _PAGE_ACCESSED;
200 static inline int pte_write(pte_t pte)
202 return pte_flags(pte) & _PAGE_RW;
205 static inline int pte_file(pte_t pte)
207 return pte_flags(pte) & _PAGE_FILE;
210 static inline int pte_huge(pte_t pte)
212 return pte_flags(pte) & _PAGE_PSE;
215 static inline int pte_global(pte_t pte)
217 return pte_flags(pte) & _PAGE_GLOBAL;
220 static inline int pte_exec(pte_t pte)
222 return !(pte_flags(pte) & _PAGE_NX);
225 static inline int pte_special(pte_t pte)
227 return pte_flags(pte) & _PAGE_SPECIAL;
230 static inline unsigned long pte_pfn(pte_t pte)
232 return (pte_val(pte) & PTE_PFN_MASK) >> PAGE_SHIFT;
235 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
237 static inline int pmd_large(pmd_t pte)
239 return (pmd_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
240 (_PAGE_PSE | _PAGE_PRESENT);
243 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
245 pteval_t v = native_pte_val(pte);
247 return native_make_pte(v | set);
250 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
252 pteval_t v = native_pte_val(pte);
254 return native_make_pte(v & ~clear);
257 static inline pte_t pte_mkclean(pte_t pte)
259 return pte_clear_flags(pte, _PAGE_DIRTY);
262 static inline pte_t pte_mkold(pte_t pte)
264 return pte_clear_flags(pte, _PAGE_ACCESSED);
267 static inline pte_t pte_wrprotect(pte_t pte)
269 return pte_clear_flags(pte, _PAGE_RW);
272 static inline pte_t pte_mkexec(pte_t pte)
274 return pte_clear_flags(pte, _PAGE_NX);
277 static inline pte_t pte_mkdirty(pte_t pte)
279 return pte_set_flags(pte, _PAGE_DIRTY);
282 static inline pte_t pte_mkyoung(pte_t pte)
284 return pte_set_flags(pte, _PAGE_ACCESSED);
287 static inline pte_t pte_mkwrite(pte_t pte)
289 return pte_set_flags(pte, _PAGE_RW);
292 static inline pte_t pte_mkhuge(pte_t pte)
294 return pte_set_flags(pte, _PAGE_PSE);
297 static inline pte_t pte_clrhuge(pte_t pte)
299 return pte_clear_flags(pte, _PAGE_PSE);
302 static inline pte_t pte_mkglobal(pte_t pte)
304 return pte_set_flags(pte, _PAGE_GLOBAL);
307 static inline pte_t pte_clrglobal(pte_t pte)
309 return pte_clear_flags(pte, _PAGE_GLOBAL);
312 static inline pte_t pte_mkspecial(pte_t pte)
314 return pte_set_flags(pte, _PAGE_SPECIAL);
317 extern pteval_t __supported_pte_mask;
320 * Mask out unsupported bits in a present pgprot. Non-present pgprots
321 * can use those bits for other purposes, so leave them be.
323 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
325 pgprotval_t protval = pgprot_val(pgprot);
327 if (protval & _PAGE_PRESENT)
328 protval &= __supported_pte_mask;
333 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
335 return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
336 massage_pgprot(pgprot));
339 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
341 return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
342 massage_pgprot(pgprot));
345 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
347 pteval_t val = pte_val(pte);
350 * Chop off the NX bit (if present), and add the NX portion of
351 * the newprot (if present):
353 val &= _PAGE_CHG_MASK;
354 val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
359 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
360 #define pgprot_modify pgprot_modify
361 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
363 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
364 pgprotval_t addbits = pgprot_val(newprot);
365 return __pgprot(preservebits | addbits);
368 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
370 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
372 static inline int is_new_memtype_allowed(unsigned long flags,
373 unsigned long new_flags)
376 * Certain new memtypes are not allowed with certain
378 * - request is uncached, return cannot be write-back
379 * - request is write-combine, return cannot be write-back
381 if ((flags == _PAGE_CACHE_UC_MINUS &&
382 new_flags == _PAGE_CACHE_WB) ||
383 (flags == _PAGE_CACHE_WC &&
384 new_flags == _PAGE_CACHE_WB)) {
392 /* Indicate that x86 has its own track and untrack pfn vma functions */
393 #define __HAVE_PFNMAP_TRACKING
395 #define __HAVE_PHYS_MEM_ACCESS_PROT
397 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
398 unsigned long size, pgprot_t vma_prot);
399 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
400 unsigned long size, pgprot_t *vma_prot);
403 /* Install a pte for a particular vaddr in kernel space. */
404 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
407 extern void native_pagetable_setup_start(pgd_t *base);
408 extern void native_pagetable_setup_done(pgd_t *base);
410 static inline void native_pagetable_setup_start(pgd_t *base) {}
411 static inline void native_pagetable_setup_done(pgd_t *base) {}
415 extern void arch_report_meminfo(struct seq_file *m);
417 #ifdef CONFIG_PARAVIRT
418 #include <asm/paravirt.h>
419 #else /* !CONFIG_PARAVIRT */
420 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
421 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
423 #define set_pte_present(mm, addr, ptep, pte) \
424 native_set_pte_present(mm, addr, ptep, pte)
425 #define set_pte_atomic(ptep, pte) \
426 native_set_pte_atomic(ptep, pte)
428 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
430 #ifndef __PAGETABLE_PUD_FOLDED
431 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
432 #define pgd_clear(pgd) native_pgd_clear(pgd)
436 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
439 #ifndef __PAGETABLE_PMD_FOLDED
440 #define pud_clear(pud) native_pud_clear(pud)
443 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
444 #define pmd_clear(pmd) native_pmd_clear(pmd)
446 #define pte_update(mm, addr, ptep) do { } while (0)
447 #define pte_update_defer(mm, addr, ptep) do { } while (0)
449 static inline void __init paravirt_pagetable_setup_start(pgd_t *base)
451 native_pagetable_setup_start(base);
454 static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
456 native_pagetable_setup_done(base);
458 #endif /* CONFIG_PARAVIRT */
460 #endif /* __ASSEMBLY__ */
463 # include "pgtable_32.h"
465 # include "pgtable_64.h"
469 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
471 * this macro returns the index of the entry in the pgd page which would
472 * control the given virtual address
474 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
477 * pgd_offset() returns a (pgd_t *)
478 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
480 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
482 * a shortcut which implies the use of the kernel's pgd, instead
485 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
488 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
489 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
501 #ifdef CONFIG_PROC_FS
502 extern void update_page_count(int level, unsigned long pages);
504 static inline void update_page_count(int level, unsigned long pages) { }
508 * Helper function that returns the kernel pagetable entry controlling
509 * the virtual address 'address'. NULL means no pagetable entry present.
510 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
513 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
515 /* local pte updates need not use xchg for locking */
516 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
520 /* Pure native function needs no input for mm, addr */
521 native_pte_clear(NULL, 0, ptep);
525 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
526 pte_t *ptep , pte_t pte)
528 native_set_pte(ptep, pte);
531 #ifndef CONFIG_PARAVIRT
533 * Rules for using pte_update - it must be called after any PTE update which
534 * has not been done using the set_pte / clear_pte interfaces. It is used by
535 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
536 * updates should either be sets, clears, or set_pte_atomic for P->P
537 * transitions, which means this hook should only be called for user PTEs.
538 * This hook implies a P->P protection or access change has taken place, which
539 * requires a subsequent TLB flush. The notification can optionally be delayed
540 * until the TLB flush event by using the pte_update_defer form of the
541 * interface, but care must be taken to assure that the flush happens while
542 * still holding the same page table lock so that the shadow and primary pages
543 * do not become out of sync on SMP.
545 #define pte_update(mm, addr, ptep) do { } while (0)
546 #define pte_update_defer(mm, addr, ptep) do { } while (0)
550 * We only update the dirty/accessed state if we set
551 * the dirty bit by hand in the kernel, since the hardware
552 * will do the accessed bit for us, and we don't want to
553 * race with other CPU's that might be updating the dirty
554 * bit at the same time.
556 struct vm_area_struct;
558 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
559 extern int ptep_set_access_flags(struct vm_area_struct *vma,
560 unsigned long address, pte_t *ptep,
561 pte_t entry, int dirty);
563 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
564 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
565 unsigned long addr, pte_t *ptep);
567 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
568 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
569 unsigned long address, pte_t *ptep);
571 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
572 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
575 pte_t pte = native_ptep_get_and_clear(ptep);
576 pte_update(mm, addr, ptep);
580 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
581 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
582 unsigned long addr, pte_t *ptep,
588 * Full address destruction in progress; paravirt does not
589 * care about updates and native needs no locking
591 pte = native_local_ptep_get_and_clear(ptep);
593 pte = ptep_get_and_clear(mm, addr, ptep);
598 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
599 static inline void ptep_set_wrprotect(struct mm_struct *mm,
600 unsigned long addr, pte_t *ptep)
602 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
603 pte_update(mm, addr, ptep);
607 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
609 * dst - pointer to pgd range anwhere on a pgd page
611 * count - the number of pgds to copy.
613 * dst and src can be on the same page, but the range must not overlap,
614 * and must not cross a page boundary.
616 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
618 memcpy(dst, src, count * sizeof(pgd_t));
622 #include <asm-generic/pgtable.h>
623 #endif /* __ASSEMBLY__ */
625 #endif /* _ASM_X86_PGTABLE_H */