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_mkclean(pte_t pte
)
245 return __pte(pte_val(pte
) & ~_PAGE_DIRTY
);
248 static inline pte_t
pte_mkold(pte_t pte
)
250 return __pte(pte_val(pte
) & ~_PAGE_ACCESSED
);
253 static inline pte_t
pte_wrprotect(pte_t pte
)
255 return __pte(pte_val(pte
) & ~_PAGE_RW
);
258 static inline pte_t
pte_mkexec(pte_t pte
)
260 return __pte(pte_val(pte
) & ~_PAGE_NX
);
263 static inline pte_t
pte_mkdirty(pte_t pte
)
265 return __pte(pte_val(pte
) | _PAGE_DIRTY
);
268 static inline pte_t
pte_mkyoung(pte_t pte
)
270 return __pte(pte_val(pte
) | _PAGE_ACCESSED
);
273 static inline pte_t
pte_mkwrite(pte_t pte
)
275 return __pte(pte_val(pte
) | _PAGE_RW
);
278 static inline pte_t
pte_mkhuge(pte_t pte
)
280 return __pte(pte_val(pte
) | _PAGE_PSE
);
283 static inline pte_t
pte_clrhuge(pte_t pte
)
285 return __pte(pte_val(pte
) & ~_PAGE_PSE
);
288 static inline pte_t
pte_mkglobal(pte_t pte
)
290 return __pte(pte_val(pte
) | _PAGE_GLOBAL
);
293 static inline pte_t
pte_clrglobal(pte_t pte
)
295 return __pte(pte_val(pte
) & ~_PAGE_GLOBAL
);
298 static inline pte_t
pte_mkspecial(pte_t pte
)
300 return __pte(pte_val(pte
) | _PAGE_SPECIAL
);
303 extern pteval_t __supported_pte_mask
;
305 static inline pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
307 return __pte((((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
308 pgprot_val(pgprot
)) & __supported_pte_mask
);
311 static inline pmd_t
pfn_pmd(unsigned long page_nr
, pgprot_t pgprot
)
313 return __pmd((((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
314 pgprot_val(pgprot
)) & __supported_pte_mask
);
317 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
319 pteval_t val
= pte_val(pte
);
322 * Chop off the NX bit (if present), and add the NX portion of
323 * the newprot (if present):
325 val
&= _PAGE_CHG_MASK
;
326 val
|= pgprot_val(newprot
) & (~_PAGE_CHG_MASK
) & __supported_pte_mask
;
331 /* mprotect needs to preserve PAT bits when updating vm_page_prot */
332 #define pgprot_modify pgprot_modify
333 static inline pgprot_t
pgprot_modify(pgprot_t oldprot
, pgprot_t newprot
)
335 pgprotval_t preservebits
= pgprot_val(oldprot
) & _PAGE_CHG_MASK
;
336 pgprotval_t addbits
= pgprot_val(newprot
);
337 return __pgprot(preservebits
| addbits
);
340 #define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
342 #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
344 static inline int is_new_memtype_allowed(unsigned long flags
,
345 unsigned long new_flags
)
348 * Certain new memtypes are not allowed with certain
350 * - request is uncached, return cannot be write-back
351 * - request is write-combine, return cannot be write-back
353 if ((flags
== _PAGE_CACHE_UC_MINUS
&&
354 new_flags
== _PAGE_CACHE_WB
) ||
355 (flags
== _PAGE_CACHE_WC
&&
356 new_flags
== _PAGE_CACHE_WB
)) {
364 /* Indicate that x86 has its own track and untrack pfn vma functions */
365 #define __HAVE_PFNMAP_TRACKING
367 #define __HAVE_PHYS_MEM_ACCESS_PROT
369 pgprot_t
phys_mem_access_prot(struct file
*file
, unsigned long pfn
,
370 unsigned long size
, pgprot_t vma_prot
);
371 int phys_mem_access_prot_allowed(struct file
*file
, unsigned long pfn
,
372 unsigned long size
, pgprot_t
*vma_prot
);
375 /* Install a pte for a particular vaddr in kernel space. */
376 void set_pte_vaddr(unsigned long vaddr
, pte_t pte
);
379 extern void native_pagetable_setup_start(pgd_t
*base
);
380 extern void native_pagetable_setup_done(pgd_t
*base
);
382 static inline void native_pagetable_setup_start(pgd_t
*base
) {}
383 static inline void native_pagetable_setup_done(pgd_t
*base
) {}
387 extern void arch_report_meminfo(struct seq_file
*m
);
389 #ifdef CONFIG_PARAVIRT
390 #include <asm/paravirt.h>
391 #else /* !CONFIG_PARAVIRT */
392 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
393 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
395 #define set_pte_present(mm, addr, ptep, pte) \
396 native_set_pte_present(mm, addr, ptep, pte)
397 #define set_pte_atomic(ptep, pte) \
398 native_set_pte_atomic(ptep, pte)
400 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
402 #ifndef __PAGETABLE_PUD_FOLDED
403 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
404 #define pgd_clear(pgd) native_pgd_clear(pgd)
408 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
411 #ifndef __PAGETABLE_PMD_FOLDED
412 #define pud_clear(pud) native_pud_clear(pud)
415 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
416 #define pmd_clear(pmd) native_pmd_clear(pmd)
418 #define pte_update(mm, addr, ptep) do { } while (0)
419 #define pte_update_defer(mm, addr, ptep) do { } while (0)
421 static inline void __init
paravirt_pagetable_setup_start(pgd_t
*base
)
423 native_pagetable_setup_start(base
);
426 static inline void __init
paravirt_pagetable_setup_done(pgd_t
*base
)
428 native_pagetable_setup_done(base
);
430 #endif /* CONFIG_PARAVIRT */
432 #endif /* __ASSEMBLY__ */
435 # include "pgtable_32.h"
437 # include "pgtable_64.h"
441 #include <linux/mm_types.h>
443 static inline int pte_none(pte_t pte
)
448 #define __HAVE_ARCH_PTE_SAME
449 static inline int pte_same(pte_t a
, pte_t b
)
451 return a
.pte
== b
.pte
;
454 static inline int pte_present(pte_t a
)
456 return pte_flags(a
) & (_PAGE_PRESENT
| _PAGE_PROTNONE
);
459 static inline int pmd_present(pmd_t pmd
)
461 return pmd_val(pmd
) & _PAGE_PRESENT
;
464 static inline int pmd_none(pmd_t pmd
)
466 /* Only check low word on 32-bit platforms, since it might be
467 out of sync with upper half. */
468 return !(unsigned long)native_pmd_val(pmd
);
471 static inline unsigned long pmd_page_vaddr(pmd_t pmd
)
473 return (unsigned long)__va(pmd_val(pmd
) & PTE_PFN_MASK
);
476 static inline struct page
*pmd_page(pmd_t pmd
)
478 return pfn_to_page(pmd_val(pmd
) >> PAGE_SHIFT
);
482 * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
484 * this macro returns the index of the entry in the pmd page which would
485 * control the given virtual address
487 static inline unsigned pmd_index(unsigned long address
)
489 return (address
>> PMD_SHIFT
) & (PTRS_PER_PMD
- 1);
493 * Conversion functions: convert a page and protection to a page entry,
494 * and a page entry and page directory to the page they refer to.
496 * (Currently stuck as a macro because of indirect forward reference
497 * to linux/mm.h:page_to_nid())
499 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
502 * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
504 * this function returns the index of the entry in the pte page which would
505 * control the given virtual address
507 static inline unsigned pte_index(unsigned long address
)
509 return (address
>> PAGE_SHIFT
) & (PTRS_PER_PTE
- 1);
512 static inline pte_t
*pte_offset_kernel(pmd_t
*pmd
, unsigned long address
)
514 return (pte_t
*)pmd_page_vaddr(*pmd
) + pte_index(address
);
517 #if PAGETABLE_LEVELS > 2
518 static inline int pud_present(pud_t pud
)
520 return pud_val(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
);
528 static inline struct page
*pud_page(pud_t pud
)
530 return pfn_to_page(pud_val(pud
) >> PAGE_SHIFT
);
533 /* Find an entry in the second-level page table.. */
534 static inline pmd_t
*pmd_offset(pud_t
*pud
, unsigned long address
)
536 return (pmd_t
*)pud_page_vaddr(*pud
) + pmd_index(address
);
539 static inline unsigned long pmd_pfn(pmd_t pmd
)
541 return (pmd_val(pmd
) & PTE_PFN_MASK
) >> PAGE_SHIFT
;
544 static inline int pud_large(pud_t pud
)
546 return (pud_val(pud
) & (_PAGE_PSE
| _PAGE_PRESENT
)) ==
547 (_PAGE_PSE
| _PAGE_PRESENT
);
549 #endif /* PAGETABLE_LEVELS > 2 */
551 #if PAGETABLE_LEVELS > 3
552 static inline int pgd_present(pgd_t pgd
)
554 return pgd_val(pgd
) & _PAGE_PRESENT
;
557 static inline unsigned long pgd_page_vaddr(pgd_t pgd
)
559 return (unsigned long)__va((unsigned long)pgd_val(pgd
) & PTE_PFN_MASK
);
562 static inline struct page
*pgd_page(pgd_t pgd
)
564 return pfn_to_page(pgd_val(pgd
) >> PAGE_SHIFT
);
567 /* to find an entry in a page-table-directory. */
568 static inline unsigned pud_index(unsigned long address
)
570 return (address
>> PUD_SHIFT
) & (PTRS_PER_PUD
- 1);
573 static inline pud_t
*pud_offset(pgd_t
*pgd
, unsigned long address
)
575 return (pud_t
*)pgd_page_vaddr(*pgd
) + pud_index(address
);
577 #endif /* PAGETABLE_LEVELS > 3 */
579 #endif /* __ASSEMBLY__ */
582 * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
584 * this macro returns the index of the entry in the pgd page which would
585 * control the given virtual address
587 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
590 * pgd_offset() returns a (pgd_t *)
591 * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
593 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
595 * a shortcut which implies the use of the kernel's pgd, instead
598 #define pgd_offset_k(address) pgd_offset(&init_mm, (address))
601 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
602 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
614 #ifdef CONFIG_PROC_FS
615 extern void update_page_count(int level
, unsigned long pages
);
617 static inline void update_page_count(int level
, unsigned long pages
) { }
621 * Helper function that returns the kernel pagetable entry controlling
622 * the virtual address 'address'. NULL means no pagetable entry present.
623 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
626 extern pte_t
*lookup_address(unsigned long address
, unsigned int *level
);
628 /* local pte updates need not use xchg for locking */
629 static inline pte_t
native_local_ptep_get_and_clear(pte_t
*ptep
)
633 /* Pure native function needs no input for mm, addr */
634 native_pte_clear(NULL
, 0, ptep
);
638 static inline void native_set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
639 pte_t
*ptep
, pte_t pte
)
641 native_set_pte(ptep
, pte
);
644 #ifndef CONFIG_PARAVIRT
646 * Rules for using pte_update - it must be called after any PTE update which
647 * has not been done using the set_pte / clear_pte interfaces. It is used by
648 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
649 * updates should either be sets, clears, or set_pte_atomic for P->P
650 * transitions, which means this hook should only be called for user PTEs.
651 * This hook implies a P->P protection or access change has taken place, which
652 * requires a subsequent TLB flush. The notification can optionally be delayed
653 * until the TLB flush event by using the pte_update_defer form of the
654 * interface, but care must be taken to assure that the flush happens while
655 * still holding the same page table lock so that the shadow and primary pages
656 * do not become out of sync on SMP.
658 #define pte_update(mm, addr, ptep) do { } while (0)
659 #define pte_update_defer(mm, addr, ptep) do { } while (0)
663 * We only update the dirty/accessed state if we set
664 * the dirty bit by hand in the kernel, since the hardware
665 * will do the accessed bit for us, and we don't want to
666 * race with other CPU's that might be updating the dirty
667 * bit at the same time.
669 struct vm_area_struct
;
671 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
672 extern int ptep_set_access_flags(struct vm_area_struct
*vma
,
673 unsigned long address
, pte_t
*ptep
,
674 pte_t entry
, int dirty
);
676 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
677 extern int ptep_test_and_clear_young(struct vm_area_struct
*vma
,
678 unsigned long addr
, pte_t
*ptep
);
680 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
681 extern int ptep_clear_flush_young(struct vm_area_struct
*vma
,
682 unsigned long address
, pte_t
*ptep
);
684 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
685 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
,
688 pte_t pte
= native_ptep_get_and_clear(ptep
);
689 pte_update(mm
, addr
, ptep
);
693 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
694 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
,
695 unsigned long addr
, pte_t
*ptep
,
701 * Full address destruction in progress; paravirt does not
702 * care about updates and native needs no locking
704 pte
= native_local_ptep_get_and_clear(ptep
);
706 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
711 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
712 static inline void ptep_set_wrprotect(struct mm_struct
*mm
,
713 unsigned long addr
, pte_t
*ptep
)
715 clear_bit(_PAGE_BIT_RW
, (unsigned long *)&ptep
->pte
);
716 pte_update(mm
, addr
, ptep
);
720 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
722 * dst - pointer to pgd range anwhere on a pgd page
724 * count - the number of pgds to copy.
726 * dst and src can be on the same page, but the range must not overlap,
727 * and must not cross a page boundary.
729 static inline void clone_pgd_range(pgd_t
*dst
, pgd_t
*src
, int count
)
731 memcpy(dst
, src
, count
* sizeof(pgd_t
));
735 #include <asm-generic/pgtable.h>
736 #endif /* __ASSEMBLY__ */
738 #endif /* _ASM_X86_PGTABLE_H */