Linux kernel mirror (for testing)
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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) \
18do { \
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) \
24do { \
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) \
39do { \
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) \
115do { \
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
131struct mm_struct;
132static 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_MULTIPLE_ZERO_PAGE
163#define move_pte(pte, prot, old_addr, new_addr) (pte)
164#else
165#define move_pte(pte, prot, old_addr, new_addr) \
166({ \
167 pte_t newpte = (pte); \
168 if (pte_present(pte) && pfn_valid(pte_pfn(pte)) && \
169 pte_page(pte) == ZERO_PAGE(old_addr)) \
170 newpte = mk_pte(ZERO_PAGE(new_addr), (prot)); \
171 newpte; \
172})
173#endif
174
175/*
176 * When walking page tables, get the address of the next boundary,
177 * or the end address of the range if that comes earlier. Although no
178 * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.
179 */
180
181#define pgd_addr_end(addr, end) \
182({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
183 (__boundary - 1 < (end) - 1)? __boundary: (end); \
184})
185
186#ifndef pud_addr_end
187#define pud_addr_end(addr, end) \
188({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \
189 (__boundary - 1 < (end) - 1)? __boundary: (end); \
190})
191#endif
192
193#ifndef pmd_addr_end
194#define pmd_addr_end(addr, end) \
195({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \
196 (__boundary - 1 < (end) - 1)? __boundary: (end); \
197})
198#endif
199
200#ifndef __ASSEMBLY__
201/*
202 * When walking page tables, we usually want to skip any p?d_none entries;
203 * and any p?d_bad entries - reporting the error before resetting to none.
204 * Do the tests inline, but report and clear the bad entry in mm/memory.c.
205 */
206void pgd_clear_bad(pgd_t *);
207void pud_clear_bad(pud_t *);
208void pmd_clear_bad(pmd_t *);
209
210static inline int pgd_none_or_clear_bad(pgd_t *pgd)
211{
212 if (pgd_none(*pgd))
213 return 1;
214 if (unlikely(pgd_bad(*pgd))) {
215 pgd_clear_bad(pgd);
216 return 1;
217 }
218 return 0;
219}
220
221static inline int pud_none_or_clear_bad(pud_t *pud)
222{
223 if (pud_none(*pud))
224 return 1;
225 if (unlikely(pud_bad(*pud))) {
226 pud_clear_bad(pud);
227 return 1;
228 }
229 return 0;
230}
231
232static inline int pmd_none_or_clear_bad(pmd_t *pmd)
233{
234 if (pmd_none(*pmd))
235 return 1;
236 if (unlikely(pmd_bad(*pmd))) {
237 pmd_clear_bad(pmd);
238 return 1;
239 }
240 return 0;
241}
242#endif /* !__ASSEMBLY__ */
243
244#endif /* _ASM_GENERIC_PGTABLE_H */