[PATCH] aic7xxx_osm build fix
[cris-mirror.git] / include / asm-generic / pgtable.h
blob1f4ec7b702706ed643c799e034c128595b3527a7
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
11 * We hold the mm semaphore for reading and vma->vm_mm->page_table_lock.
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.
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
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.
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; \
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; \
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; \
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; \
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; \
102 #endif
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; \
112 #endif
114 #ifndef __HAVE_ARCH_PTEP_SET_WRPROTECT
115 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
117 pte_t old_pte = *ptep;
118 set_pte_at(mm, address, ptep, pte_wrprotect(old_pte));
120 #endif
122 #ifndef __HAVE_ARCH_PTE_SAME
123 #define pte_same(A,B) (pte_val(A) == pte_val(B))
124 #endif
126 #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY
127 #define page_test_and_clear_dirty(page) (0)
128 #endif
130 #ifndef __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG
131 #define page_test_and_clear_young(page) (0)
132 #endif
134 #ifndef __HAVE_ARCH_PGD_OFFSET_GATE
135 #define pgd_offset_gate(mm, addr) pgd_offset(mm, addr)
136 #endif
138 #ifndef __HAVE_ARCH_LAZY_MMU_PROT_UPDATE
139 #define lazy_mmu_prot_update(pte) do { } while (0)
140 #endif
143 * When walking page tables, get the address of the next boundary,
144 * or the end address of the range if that comes earlier. Although no
145 * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.
148 #define pgd_addr_end(addr, end) \
149 ({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
150 (__boundary - 1 < (end) - 1)? __boundary: (end); \
153 #ifndef pud_addr_end
154 #define pud_addr_end(addr, end) \
155 ({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \
156 (__boundary - 1 < (end) - 1)? __boundary: (end); \
158 #endif
160 #ifndef pmd_addr_end
161 #define pmd_addr_end(addr, end) \
162 ({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \
163 (__boundary - 1 < (end) - 1)? __boundary: (end); \
165 #endif
167 #ifndef __ASSEMBLY__
169 * When walking page tables, we usually want to skip any p?d_none entries;
170 * and any p?d_bad entries - reporting the error before resetting to none.
171 * Do the tests inline, but report and clear the bad entry in mm/memory.c.
173 void pgd_clear_bad(pgd_t *);
174 void pud_clear_bad(pud_t *);
175 void pmd_clear_bad(pmd_t *);
177 static inline int pgd_none_or_clear_bad(pgd_t *pgd)
179 if (pgd_none(*pgd))
180 return 1;
181 if (unlikely(pgd_bad(*pgd))) {
182 pgd_clear_bad(pgd);
183 return 1;
185 return 0;
188 static inline int pud_none_or_clear_bad(pud_t *pud)
190 if (pud_none(*pud))
191 return 1;
192 if (unlikely(pud_bad(*pud))) {
193 pud_clear_bad(pud);
194 return 1;
196 return 0;
199 static inline int pmd_none_or_clear_bad(pmd_t *pmd)
201 if (pmd_none(*pmd))
202 return 1;
203 if (unlikely(pmd_bad(*pmd))) {
204 pmd_clear_bad(pmd);
205 return 1;
207 return 0;
209 #endif /* !__ASSEMBLY__ */
211 #endif /* _ASM_GENERIC_PGTABLE_H */