ia64/linux-2.6.18-xen.hg

view include/asm-generic/pgtable.h @ 782:9ab1c319531f

merge with linux-2.6.18-xen.hg
author Isaku Yamahata <yamahata@valinux.co.jp>
date Wed Jan 28 13:07:23 2009 +0900 (2009-01-28)
parents 5f64a1735b3c
children
line source
1 #ifndef _ASM_GENERIC_PGTABLE_H
2 #define _ASM_GENERIC_PGTABLE_H
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
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
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
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
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
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
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
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
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
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
130 #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
131 struct mm_struct;
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
139 #ifndef __HAVE_ARCH_PTE_SAME
140 #define pte_same(A,B) (pte_val(A) == pte_val(B))
141 #endif
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
150 #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
151 #define page_test_and_clear_young(page) (0)
152 #endif
154 #ifndef __HAVE_ARCH_PGD_OFFSET_GATE
155 #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr)
156 #endif
158 #ifndef __HAVE_ARCH_LAZY_MMU_PROT_UPDATE
159 #define lazy_mmu_prot_update(pte) do { } while (0)
160 #endif
162 #ifndef __HAVE_ARCH_MOVE_PTE
163 #define move_pte(pte, prot, old_addr, new_addr) (pte)
164 #endif
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 */
172 #define pgd_addr_end(addr, end) \
173 ({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
174 (__boundary - 1 < (end) - 1)? __boundary: (end); \
175 })
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
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
191 #ifndef arch_change_pte_range
192 #define arch_change_pte_range(mm, pmd, addr, end, newprot) 0
193 #endif
195 #ifndef __ASSEMBLY__
196 /*
197 * When walking page tables, we usually want to skip any p?d_none entries;
198 * and any p?d_bad entries - reporting the error before resetting to none.
199 * Do the tests inline, but report and clear the bad entry in mm/memory.c.
200 */
201 void pgd_clear_bad(pgd_t *);
202 void pud_clear_bad(pud_t *);
203 void pmd_clear_bad(pmd_t *);
205 static inline int pgd_none_or_clear_bad(pgd_t *pgd)
206 {
207 if (pgd_none(*pgd))
208 return 1;
209 if (unlikely(pgd_bad(*pgd))) {
210 pgd_clear_bad(pgd);
211 return 1;
212 }
213 return 0;
214 }
216 static inline int pud_none_or_clear_bad(pud_t *pud)
217 {
218 if (pud_none(*pud))
219 return 1;
220 if (unlikely(pud_bad(*pud))) {
221 pud_clear_bad(pud);
222 return 1;
223 }
224 return 0;
225 }
227 static inline int pmd_none_or_clear_bad(pmd_t *pmd)
228 {
229 if (pmd_none(*pmd))
230 return 1;
231 if (unlikely(pmd_bad(*pmd))) {
232 pmd_clear_bad(pmd);
233 return 1;
234 }
235 return 0;
236 }
237 #endif /* !__ASSEMBLY__ */
239 #endif /* _ASM_GENERIC_PGTABLE_H */