aboutsummaryrefslogtreecommitdiffstats
path: root/include/asm-generic/pgtable.h
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-generic/pgtable.h
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-generic/pgtable.h')
-rw-r--r--include/asm-generic/pgtable.h213
1 files changed, 213 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
new file mode 100644
index 00000000000..a3b28710d56
--- /dev/null
+++ b/include/asm-generic/pgtable.h
@@ -0,0 +1,213 @@
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 vma->vm_mm->page_table_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_CLEAR_FLUSH
105#define ptep_clear_flush(__vma, __address, __ptep) \
106({ \
107 pte_t __pte; \
108 __pte = ptep_get_and_clear((__vma)->vm_mm, __address, __ptep); \
109 flush_tlb_page(__vma, __address); \
110 __pte; \
111})
112#endif
113
114#ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
115static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
116{
117 pte_t old_pte = *ptep;
118 set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
119}
120#endif
121
122#ifndef __HAVE_ARCH_PTE_SAME
123#define pte_same(A,B) (pte_val(A) == pte_val(B))
124#endif
125
126#ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
127#define page_test_and_clear_dirty(page) (0)
128#endif
129
130#ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
131#define page_test_and_clear_young(page) (0)
132#endif
133
134#ifndef __HAVE_ARCH_PGD_OFFSET_GATE
135#define pgd_offset_gate(mm, addr) pgd_offset(mm, addr)
136#endif
137
138#ifndef __HAVE_ARCH_LAZY_MMU_PROT_UPDATE
139#define lazy_mmu_prot_update(pte) do { } while (0)
140#endif
141
142/*
143 * When walking page tables, get the address of the next boundary, or
144 * the end address of the range if that comes earlier. Although end might
145 * wrap to 0 only in clear_page_range, __boundary may wrap to 0 throughout.
146 */
147
148#ifndef pgd_addr_end
149#define pgd_addr_end(addr, end) \
150({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
151 (__boundary - 1 < (end) - 1)? __boundary: (end); \
152})
153#endif
154
155#ifndef pud_addr_end
156#define pud_addr_end(addr, end) \
157({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \
158 (__boundary - 1 < (end) - 1)? __boundary: (end); \
159})
160#endif
161
162#ifndef pmd_addr_end
163#define pmd_addr_end(addr, end) \
164({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \
165 (__boundary - 1 < (end) - 1)? __boundary: (end); \
166})
167#endif
168
169#ifndef __ASSEMBLY__
170/*
171 * When walking page tables, we usually want to skip any p?d_none entries;
172 * and any p?d_bad entries - reporting the error before resetting to none.
173 * Do the tests inline, but report and clear the bad entry in mm/memory.c.
174 */
175void pgd_clear_bad(pgd_t *);
176void pud_clear_bad(pud_t *);
177void pmd_clear_bad(pmd_t *);
178
179static inline int pgd_none_or_clear_bad(pgd_t *pgd)
180{
181 if (pgd_none(*pgd))
182 return 1;
183 if (unlikely(pgd_bad(*pgd))) {
184 pgd_clear_bad(pgd);
185 return 1;
186 }
187 return 0;
188}
189
190static inline int pud_none_or_clear_bad(pud_t *pud)
191{
192 if (pud_none(*pud))
193 return 1;
194 if (unlikely(pud_bad(*pud))) {
195 pud_clear_bad(pud);
196 return 1;
197 }
198 return 0;
199}
200
201static inline int pmd_none_or_clear_bad(pmd_t *pmd)
202{
203 if (pmd_none(*pmd))
204 return 1;
205 if (unlikely(pmd_bad(*pmd))) {
206 pmd_clear_bad(pmd);
207 return 1;
208 }
209 return 0;
210}
211#endif /* !__ASSEMBLY__ */
212
213#endif /* _ASM_GENERIC_PGTABLE_H */