1 #ifndef _ASM_X86_PGTABLE_H
2 #define _ASM_X86_PGTABLE_H
4 #define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1)
5 #define FIRST_USER_ADDRESS 0
7 #define _PAGE_BIT_PRESENT 0
9 #define _PAGE_BIT_USER 2
10 #define _PAGE_BIT_PWT 3
11 #define _PAGE_BIT_PCD 4
12 #define _PAGE_BIT_ACCESSED 5
13 #define _PAGE_BIT_DIRTY 6
14 #define _PAGE_BIT_FILE 6
15 #define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
16 #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
17 #define _PAGE_BIT_UNUSED1 9 /* available for programmer */
18 #define _PAGE_BIT_UNUSED2 10
19 #define _PAGE_BIT_UNUSED3 11
20 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
23 * Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a
24 * sign-extended value on 32-bit with all 1's in the upper word,
25 * which preserves the upper pte values on 64-bit ptes:
27 #define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT)
28 #define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW)
29 #define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER)
30 #define _PAGE_PWT (_AC(1, L)<<_PAGE_BIT_PWT)
31 #define _PAGE_PCD (_AC(1, L)<<_PAGE_BIT_PCD)
32 #define _PAGE_ACCESSED (_AC(1, L)<<_PAGE_BIT_ACCESSED)
33 #define _PAGE_DIRTY (_AC(1, L)<<_PAGE_BIT_DIRTY)
34 #define _PAGE_PSE (_AC(1, L)<<_PAGE_BIT_PSE) /* 2MB page */
35 #define _PAGE_GLOBAL (_AC(1, L)<<_PAGE_BIT_GLOBAL) /* Global TLB entry */
36 #define _PAGE_UNUSED1 (_AC(1, L)<<_PAGE_BIT_UNUSED1)
37 #define _PAGE_UNUSED2 (_AC(1, L)<<_PAGE_BIT_UNUSED2)
38 #define _PAGE_UNUSED3 (_AC(1, L)<<_PAGE_BIT_UNUSED3)
40 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
41 #define _PAGE_NX (_AC(1, ULL) << _PAGE_BIT_NX)
46 /* If _PAGE_PRESENT is clear, we use these: */
47 #define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping, saved PTE; unset:swap */
48 #define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE;
49 pte_present gives true */
51 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
52 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
54 #define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
56 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
57 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
59 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
60 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
61 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
62 #define PAGE_COPY PAGE_COPY_NOEXEC
63 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
64 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
67 #define _PAGE_KERNEL_EXEC \
68 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
69 #define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX)
72 extern pteval_t __PAGE_KERNEL
, __PAGE_KERNEL_EXEC
;
73 #endif /* __ASSEMBLY__ */
75 #define __PAGE_KERNEL_EXEC \
76 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
77 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
80 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
81 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
82 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
83 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
84 #define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
85 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
86 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
89 # define MAKE_GLOBAL(x) __pgprot((x))
91 # define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
94 #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
95 #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
96 #define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
97 #define PAGE_KERNEL_RX MAKE_GLOBAL(__PAGE_KERNEL_RX)
98 #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
99 #define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
100 #define PAGE_KERNEL_LARGE_EXEC MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
101 #define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
102 #define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
105 #define __P000 PAGE_NONE
106 #define __P001 PAGE_READONLY
107 #define __P010 PAGE_COPY
108 #define __P011 PAGE_COPY
109 #define __P100 PAGE_READONLY_EXEC
110 #define __P101 PAGE_READONLY_EXEC
111 #define __P110 PAGE_COPY_EXEC
112 #define __P111 PAGE_COPY_EXEC
114 #define __S000 PAGE_NONE
115 #define __S001 PAGE_READONLY
116 #define __S010 PAGE_SHARED
117 #define __S011 PAGE_SHARED
118 #define __S100 PAGE_READONLY_EXEC
119 #define __S101 PAGE_READONLY_EXEC
120 #define __S110 PAGE_SHARED_EXEC
121 #define __S111 PAGE_SHARED_EXEC
126 * ZERO_PAGE is a global shared page that is always zero: used
127 * for zero-mapped memory areas etc..
129 extern unsigned long empty_zero_page
[PAGE_SIZE
/sizeof(unsigned long)];
130 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
134 * The following only work if pte_present() is true.
135 * Undefined behaviour if not..
137 static inline int pte_dirty(pte_t pte
) { return pte_val(pte
) & _PAGE_DIRTY
; }
138 static inline int pte_young(pte_t pte
) { return pte_val(pte
) & _PAGE_ACCESSED
; }
139 static inline int pte_write(pte_t pte
) { return pte_val(pte
) & _PAGE_RW
; }
140 static inline int pte_file(pte_t pte
) { return pte_val(pte
) & _PAGE_FILE
; }
141 static inline int pte_huge(pte_t pte
) { return pte_val(pte
) & _PAGE_PSE
; }
142 static inline int pte_global(pte_t pte
) { return pte_val(pte
) & _PAGE_GLOBAL
; }
143 static inline int pte_exec(pte_t pte
) { return !(pte_val(pte
) & _PAGE_NX
); }
145 static inline int pmd_large(pmd_t pte
) {
146 return (pmd_val(pte
) & (_PAGE_PSE
|_PAGE_PRESENT
)) ==
147 (_PAGE_PSE
|_PAGE_PRESENT
);
150 static inline pte_t
pte_mkclean(pte_t pte
) { return __pte(pte_val(pte
) & ~(pteval_t
)_PAGE_DIRTY
); }
151 static inline pte_t
pte_mkold(pte_t pte
) { return __pte(pte_val(pte
) & ~(pteval_t
)_PAGE_ACCESSED
); }
152 static inline pte_t
pte_wrprotect(pte_t pte
) { return __pte(pte_val(pte
) & ~(pteval_t
)_PAGE_RW
); }
153 static inline pte_t
pte_mkexec(pte_t pte
) { return __pte(pte_val(pte
) & ~(pteval_t
)_PAGE_NX
); }
154 static inline pte_t
pte_mkdirty(pte_t pte
) { return __pte(pte_val(pte
) | _PAGE_DIRTY
); }
155 static inline pte_t
pte_mkyoung(pte_t pte
) { return __pte(pte_val(pte
) | _PAGE_ACCESSED
); }
156 static inline pte_t
pte_mkwrite(pte_t pte
) { return __pte(pte_val(pte
) | _PAGE_RW
); }
157 static inline pte_t
pte_mkhuge(pte_t pte
) { return __pte(pte_val(pte
) | _PAGE_PSE
); }
158 static inline pte_t
pte_clrhuge(pte_t pte
) { return __pte(pte_val(pte
) & ~(pteval_t
)_PAGE_PSE
); }
159 static inline pte_t
pte_mkglobal(pte_t pte
) { return __pte(pte_val(pte
) | _PAGE_GLOBAL
); }
160 static inline pte_t
pte_clrglobal(pte_t pte
) { return __pte(pte_val(pte
) & ~(pteval_t
)_PAGE_GLOBAL
); }
162 extern pteval_t __supported_pte_mask
;
164 static inline pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
166 return __pte((((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
167 pgprot_val(pgprot
)) & __supported_pte_mask
);
170 static inline pmd_t
pfn_pmd(unsigned long page_nr
, pgprot_t pgprot
)
172 return __pmd((((phys_addr_t
)page_nr
<< PAGE_SHIFT
) |
173 pgprot_val(pgprot
)) & __supported_pte_mask
);
176 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
178 pteval_t val
= pte_val(pte
);
181 * Chop off the NX bit (if present), and add the NX portion of
182 * the newprot (if present):
184 val
&= _PAGE_CHG_MASK
& ~_PAGE_NX
;
185 val
|= pgprot_val(newprot
) & __supported_pte_mask
;
190 #define pte_pgprot(x) __pgprot(pte_val(x) & (0xfff | _PAGE_NX))
192 #define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
194 #ifdef CONFIG_PARAVIRT
195 #include <asm/paravirt.h>
196 #else /* !CONFIG_PARAVIRT */
197 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
198 #define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
200 #define set_pte_present(mm, addr, ptep, pte) \
201 native_set_pte_present(mm, addr, ptep, pte)
202 #define set_pte_atomic(ptep, pte) \
203 native_set_pte_atomic(ptep, pte)
205 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
207 #ifndef __PAGETABLE_PUD_FOLDED
208 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
209 #define pgd_clear(pgd) native_pgd_clear(pgd)
213 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
216 #ifndef __PAGETABLE_PMD_FOLDED
217 #define pud_clear(pud) native_pud_clear(pud)
220 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
221 #define pmd_clear(pmd) native_pmd_clear(pmd)
223 #define pte_update(mm, addr, ptep) do { } while (0)
224 #define pte_update_defer(mm, addr, ptep) do { } while (0)
225 #endif /* CONFIG_PARAVIRT */
227 #endif /* __ASSEMBLY__ */
230 # include "pgtable_32.h"
232 # include "pgtable_64.h"
237 /* local pte updates need not use xchg for locking */
238 static inline pte_t
native_local_ptep_get_and_clear(pte_t
*ptep
)
242 /* Pure native function needs no input for mm, addr */
243 native_pte_clear(NULL
, 0, ptep
);
247 static inline void native_set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
248 pte_t
*ptep
, pte_t pte
)
250 native_set_pte(ptep
, pte
);
253 #ifndef CONFIG_PARAVIRT
255 * Rules for using pte_update - it must be called after any PTE update which
256 * has not been done using the set_pte / clear_pte interfaces. It is used by
257 * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE
258 * updates should either be sets, clears, or set_pte_atomic for P->P
259 * transitions, which means this hook should only be called for user PTEs.
260 * This hook implies a P->P protection or access change has taken place, which
261 * requires a subsequent TLB flush. The notification can optionally be delayed
262 * until the TLB flush event by using the pte_update_defer form of the
263 * interface, but care must be taken to assure that the flush happens while
264 * still holding the same page table lock so that the shadow and primary pages
265 * do not become out of sync on SMP.
267 #define pte_update(mm, addr, ptep) do { } while (0)
268 #define pte_update_defer(mm, addr, ptep) do { } while (0)
272 * We only update the dirty/accessed state if we set
273 * the dirty bit by hand in the kernel, since the hardware
274 * will do the accessed bit for us, and we don't want to
275 * race with other CPU's that might be updating the dirty
276 * bit at the same time.
278 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
279 #define ptep_set_access_flags(vma, address, ptep, entry, dirty) \
281 int __changed = !pte_same(*(ptep), entry); \
282 if (__changed && dirty) { \
284 pte_update_defer((vma)->vm_mm, (address), (ptep)); \
285 flush_tlb_page(vma, address); \
290 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
291 #define ptep_test_and_clear_young(vma, addr, ptep) ({ \
293 if (pte_young(*(ptep))) \
294 __ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, \
297 pte_update((vma)->vm_mm, addr, ptep); \
301 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
302 #define ptep_clear_flush_young(vma, address, ptep) \
305 __young = ptep_test_and_clear_young((vma), (address), (ptep)); \
307 flush_tlb_page(vma, address); \
311 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
312 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
314 pte_t pte
= native_ptep_get_and_clear(ptep
);
315 pte_update(mm
, addr
, ptep
);
319 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
320 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
, int full
)
325 * Full address destruction in progress; paravirt does not
326 * care about updates and native needs no locking
328 pte
= native_local_ptep_get_and_clear(ptep
);
330 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
335 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
336 static inline void ptep_set_wrprotect(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
338 clear_bit(_PAGE_BIT_RW
, (unsigned long *)&ptep
->pte
);
339 pte_update(mm
, addr
, ptep
);
342 #include <asm-generic/pgtable.h>
343 #endif /* __ASSEMBLY__ */
345 #endif /* _ASM_X86_PGTABLE_H */