1 #ifndef _ASM_GENERIC_PGTABLE_H
2 #define _ASM_GENERIC_PGTABLE_H
3
4 #ifndef __HAVE_ARCH_PTEP_ESTABLISH
5 /*
6 * Establish a new mapping:
7 * - flush the old one
8 * - update the page tables
9 * - inform the TLB about the new one
10 *
11 * We hold the mm semaphore for reading, and the pte lock.
12 *
13 * Note: the old pte is known to not be writable, so we don't need to
14 * worry about dirty bits etc getting lost.
15 */
16 #ifndef __HAVE_ARCH_SET_PTE_ATOMIC
17 #define ptep_establish(__vma, __address, __ptep, __entry) \
18 do { \
19 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
20 flush_tlb_page(__vma, __address); \
21 } while (0)
22 #else /* __HAVE_ARCH_SET_PTE_ATOMIC */
23 #define ptep_establish(__vma, __address, __ptep, __entry) \
24 do { \
25 set_pte_atomic(__ptep, __entry); \
26 flush_tlb_page(__vma, __address); \
27 } while (0)
28 #endif /* __HAVE_ARCH_SET_PTE_ATOMIC */
29 #endif
30
31 #ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
32 /*
33 * Largely same as above, but only sets the access flags (dirty,
34 * accessed, and writable). Furthermore, we know it always gets set
35 * to a "more permissive" setting, which allows most architectures
36 * to optimize this.
37 */
38 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
39 do { \
40 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
41 flush_tlb_page(__vma, __address); \
42 } while (0)
43 #endif
44
45 #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
46 #define ptep_test_and_clear_young(__vma, __address, __ptep) \
47 ({ \
48 pte_t __pte = *(__ptep); \
49 int r = 1; \
50 if (!pte_young(__pte)) \
51 r = 0; \
52 else \
53 set_pte_at((__vma)->vm_mm, (__address), \
54 (__ptep), pte_mkold(__pte)); \
55 r; \
56 })
57 #endif
58
59 #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
60 #define ptep_clear_flush_young(__vma, __address, __ptep) \
61 ({ \
62 int __young; \
63 __young = ptep_test_and_clear_young(__vma, __address, __ptep); \
64 if (__young) \
65 flush_tlb_page(__vma, __address); \
66 __young; \
67 })
68 #endif
69
70 #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
71 #define ptep_test_and_clear_dirty(__vma, __address, __ptep) \
72 ({ \
73 pte_t __pte = *__ptep; \
74 int r = 1; \
75 if (!pte_dirty(__pte)) \
76 r = 0; \
77 else \
78 set_pte_at((__vma)->vm_mm, (__address), (__ptep), \
79 pte_mkclean(__pte)); \
80 r; \
81 })
82 #endif
83
84 #ifndef __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
85 #define ptep_clear_flush_dirty(__vma, __address, __ptep) \
86 ({ \
87 int __dirty; \
88 __dirty = ptep_test_and_clear_dirty(__vma, __address, __ptep); \
89 if (__dirty) \
90 flush_tlb_page(__vma, __address); \
91 __dirty; \
92 })
93 #endif
94
95 #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
96 #define ptep_get_and_clear(__mm, __address, __ptep) \
97 ({ \
98 pte_t __pte = *(__ptep); \
99 pte_clear((__mm), (__address), (__ptep)); \
100 __pte; \
101 })
102 #endif
103
104 #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
105 #define ptep_get_and_clear_full(__mm, __address, __ptep, __full) \
106 ({ \
107 pte_t __pte; \
108 __pte = ptep_get_and_clear((__mm), (__address), (__ptep)); \
109 __pte; \
110 })
111 #endif
112
113 #ifndef __HAVE_ARCH_PTE_CLEAR_FULL
114 #define pte_clear_full(__mm, __address, __ptep, __full) \
115 do { \
116 pte_clear((__mm), (__address), (__ptep)); \
117 } while (0)
118 #endif
119
120 #ifndef __HAVE_ARCH_PTEP_CLEAR_FLUSH
121 #define ptep_clear_flush(__vma, __address, __ptep) \
122 ({ \
123 pte_t __pte; \
124 __pte = ptep_get_and_clear((__vma)->vm_mm, __address, __ptep); \
125 flush_tlb_page(__vma, __address); \
126 __pte; \
127 })
128 #endif
129
130 #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
131 struct mm_struct;
ptep_set_wrprotect(struct mm_struct * mm,unsigned long address,pte_t * ptep)132 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
133 {
134 pte_t old_pte = *ptep;
135 set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
136 }
137 #endif
138
139 #ifndef __HAVE_ARCH_PTE_SAME
140 #define pte_same(A,B) (pte_val(A) == pte_val(B))
141 #endif
142
143 #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
144 #define page_test_and_clear_dirty(page) (0)
145 #define pte_maybe_dirty(pte) pte_dirty(pte)
146 #else
147 #define pte_maybe_dirty(pte) (1)
148 #endif
149
150 #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
151 #define page_test_and_clear_young(page) (0)
152 #endif
153
154 #ifndef __HAVE_ARCH_PGD_OFFSET_GATE
155 #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr)
156 #endif
157
158 #ifndef __HAVE_ARCH_LAZY_MMU_PROT_UPDATE
159 #define lazy_mmu_prot_update(pte) do { } while (0)
160 #endif
161
162 #ifndef __HAVE_ARCH_MOVE_PTE
163 #define move_pte(pte, prot, old_addr, new_addr) (pte)
164 #endif
165
166 /*
167 * When walking page tables, get the address of the next boundary,
168 * or the end address of the range if that comes earlier. Although no
169 * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.
170 */
171
172 #define pgd_addr_end(addr, end) \
173 ({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
174 (__boundary - 1 < (end) - 1)? __boundary: (end); \
175 })
176
177 #ifndef pud_addr_end
178 #define pud_addr_end(addr, end) \
179 ({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \
180 (__boundary - 1 < (end) - 1)? __boundary: (end); \
181 })
182 #endif
183
184 #ifndef pmd_addr_end
185 #define pmd_addr_end(addr, end) \
186 ({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \
187 (__boundary - 1 < (end) - 1)? __boundary: (end); \
188 })
189 #endif
190
191 #ifndef __ASSEMBLY__
192 /*
193 * When walking page tables, we usually want to skip any p?d_none entries;
194 * and any p?d_bad entries - reporting the error before resetting to none.
195 * Do the tests inline, but report and clear the bad entry in mm/memory.c.
196 */
197 void pgd_clear_bad(pgd_t *);
198 void pud_clear_bad(pud_t *);
199 void pmd_clear_bad(pmd_t *);
200
pgd_none_or_clear_bad(pgd_t * pgd)201 static inline int pgd_none_or_clear_bad(pgd_t *pgd)
202 {
203 if (pgd_none(*pgd))
204 return 1;
205 if (unlikely(pgd_bad(*pgd))) {
206 pgd_clear_bad(pgd);
207 return 1;
208 }
209 return 0;
210 }
211
pud_none_or_clear_bad(pud_t * pud)212 static inline int pud_none_or_clear_bad(pud_t *pud)
213 {
214 if (pud_none(*pud))
215 return 1;
216 if (unlikely(pud_bad(*pud))) {
217 pud_clear_bad(pud);
218 return 1;
219 }
220 return 0;
221 }
222
pmd_none_or_clear_bad(pmd_t * pmd)223 static inline int pmd_none_or_clear_bad(pmd_t *pmd)
224 {
225 if (pmd_none(*pmd))
226 return 1;
227 if (unlikely(pmd_bad(*pmd))) {
228 pmd_clear_bad(pmd);
229 return 1;
230 }
231 return 0;
232 }
233 #endif /* !__ASSEMBLY__ */
234
235 #endif /* _ASM_GENERIC_PGTABLE_H */
236