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6c386655 JF |
1 | #ifndef _ASM_X86_PGTABLE_H |
2 | #define _ASM_X86_PGTABLE_H | |
3 | ||
4 | #define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1) | |
5 | #define FIRST_USER_ADDRESS 0 | |
6 | ||
7 | #define _PAGE_BIT_PRESENT 0 | |
8 | #define _PAGE_BIT_RW 1 | |
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 */ | |
21 | ||
61f38226 IM |
22 | #define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT) |
23 | #define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW) | |
24 | #define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER) | |
25 | #define _PAGE_PWT (_AC(1, L)<<_PAGE_BIT_PWT) | |
26 | #define _PAGE_PCD (_AC(1, L)<<_PAGE_BIT_PCD) | |
27 | #define _PAGE_ACCESSED (_AC(1, L)<<_PAGE_BIT_ACCESSED) | |
28 | #define _PAGE_DIRTY (_AC(1, L)<<_PAGE_BIT_DIRTY) | |
29 | #define _PAGE_PSE (_AC(1, L)<<_PAGE_BIT_PSE) /* 2MB page */ | |
30 | #define _PAGE_GLOBAL (_AC(1, L)<<_PAGE_BIT_GLOBAL) /* Global TLB entry */ | |
31 | #define _PAGE_UNUSED1 (_AC(1, L)<<_PAGE_BIT_UNUSED1) | |
32 | #define _PAGE_UNUSED2 (_AC(1, L)<<_PAGE_BIT_UNUSED2) | |
33 | #define _PAGE_UNUSED3 (_AC(1, L)<<_PAGE_BIT_UNUSED3) | |
6c386655 JF |
34 | |
35 | #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE) | |
36 | #define _PAGE_NX (_AC(1, ULL) << _PAGE_BIT_NX) | |
37 | #else | |
38 | #define _PAGE_NX 0 | |
39 | #endif | |
40 | ||
41 | /* If _PAGE_PRESENT is clear, we use these: */ | |
42 | #define _PAGE_FILE _PAGE_DIRTY /* nonlinear file mapping, saved PTE; unset:swap */ | |
43 | #define _PAGE_PROTNONE _PAGE_PSE /* if the user mapped it with PROT_NONE; | |
44 | pte_present gives true */ | |
45 | ||
46 | #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY) | |
47 | #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) | |
48 | ||
49 | #define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) | |
50 | ||
51 | #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) | |
52 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX) | |
53 | ||
54 | #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED) | |
55 | #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX) | |
56 | #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) | |
57 | #define PAGE_COPY PAGE_COPY_NOEXEC | |
58 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX) | |
59 | #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) | |
60 | ||
61 | #ifdef CONFIG_X86_32 | |
62 | #define _PAGE_KERNEL_EXEC \ | |
63 | (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) | |
64 | #define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX) | |
65 | ||
66 | #ifndef __ASSEMBLY__ | |
67 | extern unsigned long long __PAGE_KERNEL, __PAGE_KERNEL_EXEC; | |
68 | #endif /* __ASSEMBLY__ */ | |
69 | #else | |
70 | #define __PAGE_KERNEL_EXEC \ | |
71 | (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) | |
72 | #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX) | |
73 | #endif | |
74 | ||
75 | #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW) | |
76 | #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW) | |
77 | #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT) | |
78 | #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER) | |
79 | #define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT) | |
80 | #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE) | |
81 | #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE) | |
82 | ||
83 | #ifdef CONFIG_X86_32 | |
84 | # define MAKE_GLOBAL(x) __pgprot((x)) | |
85 | #else | |
86 | # define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL) | |
87 | #endif | |
88 | ||
89 | #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL) | |
90 | #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO) | |
91 | #define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC) | |
92 | #define PAGE_KERNEL_RX MAKE_GLOBAL(__PAGE_KERNEL_RX) | |
93 | #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE) | |
94 | #define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE) | |
95 | #define PAGE_KERNEL_LARGE_EXEC MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC) | |
96 | #define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL) | |
97 | #define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE) | |
98 | ||
99 | /* xwr */ | |
100 | #define __P000 PAGE_NONE | |
101 | #define __P001 PAGE_READONLY | |
102 | #define __P010 PAGE_COPY | |
103 | #define __P011 PAGE_COPY | |
104 | #define __P100 PAGE_READONLY_EXEC | |
105 | #define __P101 PAGE_READONLY_EXEC | |
106 | #define __P110 PAGE_COPY_EXEC | |
107 | #define __P111 PAGE_COPY_EXEC | |
108 | ||
109 | #define __S000 PAGE_NONE | |
110 | #define __S001 PAGE_READONLY | |
111 | #define __S010 PAGE_SHARED | |
112 | #define __S011 PAGE_SHARED | |
113 | #define __S100 PAGE_READONLY_EXEC | |
114 | #define __S101 PAGE_READONLY_EXEC | |
115 | #define __S110 PAGE_SHARED_EXEC | |
116 | #define __S111 PAGE_SHARED_EXEC | |
117 | ||
4614139c | 118 | #ifndef __ASSEMBLY__ |
195466dc | 119 | |
4614139c JF |
120 | /* |
121 | * The following only work if pte_present() is true. | |
122 | * Undefined behaviour if not.. | |
123 | */ | |
124 | static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } | |
125 | static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } | |
126 | static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; } | |
127 | static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } | |
128 | static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_PSE; } | |
129 | ||
130 | static inline int pmd_large(pmd_t pte) { | |
131 | return (pmd_val(pte) & (_PAGE_PSE|_PAGE_PRESENT)) == | |
132 | (_PAGE_PSE|_PAGE_PRESENT); | |
133 | } | |
134 | ||
135 | static inline pte_t pte_mkclean(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_DIRTY); } | |
136 | static inline pte_t pte_mkold(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_ACCESSED); } | |
137 | static inline pte_t pte_wrprotect(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_RW); } | |
138 | static inline pte_t pte_mkexec(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_NX); } | |
139 | static inline pte_t pte_mkdirty(pte_t pte) { return __pte(pte_val(pte) | _PAGE_DIRTY); } | |
140 | static inline pte_t pte_mkyoung(pte_t pte) { return __pte(pte_val(pte) | _PAGE_ACCESSED); } | |
141 | static inline pte_t pte_mkwrite(pte_t pte) { return __pte(pte_val(pte) | _PAGE_RW); } | |
142 | static inline pte_t pte_mkhuge(pte_t pte) { return __pte(pte_val(pte) | _PAGE_PSE); } | |
143 | static inline pte_t pte_clrhuge(pte_t pte) { return __pte(pte_val(pte) & ~_PAGE_PSE); } | |
144 | ||
6fdc05d4 JF |
145 | extern pteval_t __supported_pte_mask; |
146 | ||
147 | static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) | |
148 | { | |
149 | return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) | | |
150 | pgprot_val(pgprot)) & __supported_pte_mask); | |
151 | } | |
152 | ||
153 | static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) | |
154 | { | |
155 | return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) | | |
156 | pgprot_val(pgprot)) & __supported_pte_mask); | |
157 | } | |
158 | ||
38472311 IM |
159 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
160 | { | |
161 | pteval_t val = pte_val(pte); | |
162 | ||
163 | /* | |
164 | * Chop off the NX bit (if present), and add the NX portion of | |
165 | * the newprot (if present): | |
166 | */ | |
167 | val &= _PAGE_CHG_MASK & ~_PAGE_NX; | |
168 | val |= pgprot_val(newprot) & __supported_pte_mask; | |
169 | ||
170 | return __pte(val); | |
171 | } | |
172 | ||
4614139c JF |
173 | #endif /* __ASSEMBLY__ */ |
174 | ||
96a388de TG |
175 | #ifdef CONFIG_X86_32 |
176 | # include "pgtable_32.h" | |
177 | #else | |
178 | # include "pgtable_64.h" | |
179 | #endif | |
6c386655 | 180 | |
195466dc JF |
181 | #ifndef __ASSEMBLY__ |
182 | ||
183 | #ifndef CONFIG_PARAVIRT | |
184 | /* | |
185 | * Rules for using pte_update - it must be called after any PTE update which | |
186 | * has not been done using the set_pte / clear_pte interfaces. It is used by | |
187 | * shadow mode hypervisors to resynchronize the shadow page tables. Kernel PTE | |
188 | * updates should either be sets, clears, or set_pte_atomic for P->P | |
189 | * transitions, which means this hook should only be called for user PTEs. | |
190 | * This hook implies a P->P protection or access change has taken place, which | |
191 | * requires a subsequent TLB flush. The notification can optionally be delayed | |
192 | * until the TLB flush event by using the pte_update_defer form of the | |
193 | * interface, but care must be taken to assure that the flush happens while | |
194 | * still holding the same page table lock so that the shadow and primary pages | |
195 | * do not become out of sync on SMP. | |
196 | */ | |
197 | #define pte_update(mm, addr, ptep) do { } while (0) | |
198 | #define pte_update_defer(mm, addr, ptep) do { } while (0) | |
199 | #endif | |
200 | ||
201 | /* local pte updates need not use xchg for locking */ | |
202 | static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep) | |
203 | { | |
204 | pte_t res = *ptep; | |
205 | ||
206 | /* Pure native function needs no input for mm, addr */ | |
207 | native_pte_clear(NULL, 0, ptep); | |
208 | return res; | |
209 | } | |
210 | ||
211 | /* | |
212 | * We only update the dirty/accessed state if we set | |
213 | * the dirty bit by hand in the kernel, since the hardware | |
214 | * will do the accessed bit for us, and we don't want to | |
215 | * race with other CPU's that might be updating the dirty | |
216 | * bit at the same time. | |
217 | */ | |
218 | #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS | |
219 | #define ptep_set_access_flags(vma, address, ptep, entry, dirty) \ | |
220 | ({ \ | |
221 | int __changed = !pte_same(*(ptep), entry); \ | |
222 | if (__changed && dirty) { \ | |
223 | *ptep = entry; \ | |
224 | pte_update_defer((vma)->vm_mm, (address), (ptep)); \ | |
225 | flush_tlb_page(vma, address); \ | |
226 | } \ | |
227 | __changed; \ | |
228 | }) | |
229 | ||
230 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
231 | #define ptep_test_and_clear_young(vma, addr, ptep) ({ \ | |
232 | int __ret = 0; \ | |
233 | if (pte_young(*(ptep))) \ | |
234 | __ret = test_and_clear_bit(_PAGE_BIT_ACCESSED, \ | |
235 | &(ptep)->pte); \ | |
236 | if (__ret) \ | |
237 | pte_update((vma)->vm_mm, addr, ptep); \ | |
238 | __ret; \ | |
239 | }) | |
240 | ||
241 | #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH | |
242 | #define ptep_clear_flush_young(vma, address, ptep) \ | |
243 | ({ \ | |
244 | int __young; \ | |
245 | __young = ptep_test_and_clear_young((vma), (address), (ptep)); \ | |
246 | if (__young) \ | |
247 | flush_tlb_page(vma, address); \ | |
248 | __young; \ | |
249 | }) | |
250 | ||
251 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR | |
252 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
253 | { | |
254 | pte_t pte = native_ptep_get_and_clear(ptep); | |
255 | pte_update(mm, addr, ptep); | |
256 | return pte; | |
257 | } | |
258 | ||
259 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL | |
260 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full) | |
261 | { | |
262 | pte_t pte; | |
263 | if (full) { | |
264 | /* | |
265 | * Full address destruction in progress; paravirt does not | |
266 | * care about updates and native needs no locking | |
267 | */ | |
268 | pte = native_local_ptep_get_and_clear(ptep); | |
269 | } else { | |
270 | pte = ptep_get_and_clear(mm, addr, ptep); | |
271 | } | |
272 | return pte; | |
273 | } | |
274 | ||
275 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT | |
276 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
277 | { | |
278 | clear_bit(_PAGE_BIT_RW, &ptep->pte); | |
279 | pte_update(mm, addr, ptep); | |
280 | } | |
281 | ||
282 | #ifndef CONFIG_PARAVIRT | |
283 | #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep) | |
284 | #endif /* !CONFIG_PARAVIRT */ | |
285 | ||
286 | #include <asm-generic/pgtable.h> | |
287 | #endif /* __ASSEMBLY__ */ | |
288 | ||
6c386655 | 289 | #endif /* _ASM_X86_PGTABLE_H */ |