Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_HIGHMEM_H |
2 | #define _LINUX_HIGHMEM_H | |
3 | ||
1da177e4 LT |
4 | #include <linux/fs.h> |
5 | #include <linux/mm.h> | |
ad76fb6b | 6 | #include <linux/uaccess.h> |
1da177e4 LT |
7 | |
8 | #include <asm/cacheflush.h> | |
9 | ||
03beb076 | 10 | #ifndef ARCH_HAS_FLUSH_ANON_PAGE |
a6f36be3 | 11 | static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr) |
03beb076 JB |
12 | { |
13 | } | |
14 | #endif | |
15 | ||
5a3a5a98 JB |
16 | #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE |
17 | static inline void flush_kernel_dcache_page(struct page *page) | |
18 | { | |
19 | } | |
9df5f741 JB |
20 | static inline void flush_kernel_vmap_range(void *vaddr, int size) |
21 | { | |
22 | } | |
23 | static inline void invalidate_kernel_vmap_range(void *vaddr, int size) | |
24 | { | |
25 | } | |
5a3a5a98 JB |
26 | #endif |
27 | ||
3688e07f KG |
28 | #include <asm/kmap_types.h> |
29 | ||
30 | #if defined(CONFIG_DEBUG_HIGHMEM) && defined(CONFIG_TRACE_IRQFLAGS_SUPPORT) | |
31 | ||
32 | void debug_kmap_atomic(enum km_type type); | |
33 | ||
34 | #else | |
1da177e4 | 35 | |
3688e07f KG |
36 | static inline void debug_kmap_atomic(enum km_type type) |
37 | { | |
38 | } | |
39 | ||
40 | #endif | |
41 | ||
42 | #ifdef CONFIG_HIGHMEM | |
1da177e4 LT |
43 | #include <asm/highmem.h> |
44 | ||
45 | /* declarations for linux/mm/highmem.c */ | |
46 | unsigned int nr_free_highpages(void); | |
c1f60a5a | 47 | extern unsigned long totalhigh_pages; |
1da177e4 | 48 | |
ce6234b5 JF |
49 | void kmap_flush_unused(void); |
50 | ||
1da177e4 LT |
51 | #else /* CONFIG_HIGHMEM */ |
52 | ||
53 | static inline unsigned int nr_free_highpages(void) { return 0; } | |
54 | ||
4b529401 | 55 | #define totalhigh_pages 0UL |
c1f60a5a | 56 | |
a6ca1b99 | 57 | #ifndef ARCH_HAS_KMAP |
1da177e4 LT |
58 | static inline void *kmap(struct page *page) |
59 | { | |
60 | might_sleep(); | |
61 | return page_address(page); | |
62 | } | |
63 | ||
31c91132 MW |
64 | static inline void kunmap(struct page *page) |
65 | { | |
66 | } | |
1da177e4 | 67 | |
254f9c5c GU |
68 | static inline void *kmap_atomic(struct page *page, enum km_type idx) |
69 | { | |
70 | pagefault_disable(); | |
71 | return page_address(page); | |
72 | } | |
ce6234b5 | 73 | #define kmap_atomic_prot(page, idx, prot) kmap_atomic(page, idx) |
254f9c5c | 74 | |
ad76fb6b PZ |
75 | #define kunmap_atomic(addr, idx) do { pagefault_enable(); } while (0) |
76 | #define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx)) | |
1da177e4 | 77 | #define kmap_atomic_to_page(ptr) virt_to_page(ptr) |
ce6234b5 JF |
78 | |
79 | #define kmap_flush_unused() do {} while(0) | |
a6ca1b99 | 80 | #endif |
1da177e4 LT |
81 | |
82 | #endif /* CONFIG_HIGHMEM */ | |
83 | ||
84 | /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ | |
487ff320 | 85 | #ifndef clear_user_highpage |
1da177e4 LT |
86 | static inline void clear_user_highpage(struct page *page, unsigned long vaddr) |
87 | { | |
88 | void *addr = kmap_atomic(page, KM_USER0); | |
89 | clear_user_page(addr, vaddr, page); | |
90 | kunmap_atomic(addr, KM_USER0); | |
1da177e4 | 91 | } |
487ff320 | 92 | #endif |
1da177e4 LT |
93 | |
94 | #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE | |
769848c0 MG |
95 | /** |
96 | * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags | |
97 | * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE | |
98 | * @vma: The VMA the page is to be allocated for | |
99 | * @vaddr: The virtual address the page will be inserted into | |
100 | * | |
101 | * This function will allocate a page for a VMA but the caller is expected | |
102 | * to specify via movableflags whether the page will be movable in the | |
103 | * future or not | |
104 | * | |
105 | * An architecture may override this function by defining | |
106 | * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own | |
107 | * implementation. | |
108 | */ | |
1da177e4 | 109 | static inline struct page * |
769848c0 MG |
110 | __alloc_zeroed_user_highpage(gfp_t movableflags, |
111 | struct vm_area_struct *vma, | |
112 | unsigned long vaddr) | |
1da177e4 | 113 | { |
769848c0 MG |
114 | struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags, |
115 | vma, vaddr); | |
1da177e4 LT |
116 | |
117 | if (page) | |
118 | clear_user_highpage(page, vaddr); | |
119 | ||
120 | return page; | |
121 | } | |
122 | #endif | |
123 | ||
769848c0 MG |
124 | /** |
125 | * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move | |
126 | * @vma: The VMA the page is to be allocated for | |
127 | * @vaddr: The virtual address the page will be inserted into | |
128 | * | |
129 | * This function will allocate a page for a VMA that the caller knows will | |
130 | * be able to migrate in the future using move_pages() or reclaimed | |
131 | */ | |
132 | static inline struct page * | |
133 | alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, | |
134 | unsigned long vaddr) | |
135 | { | |
136 | return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); | |
137 | } | |
138 | ||
1da177e4 LT |
139 | static inline void clear_highpage(struct page *page) |
140 | { | |
141 | void *kaddr = kmap_atomic(page, KM_USER0); | |
142 | clear_page(kaddr); | |
143 | kunmap_atomic(kaddr, KM_USER0); | |
144 | } | |
145 | ||
eebd2aa3 CL |
146 | static inline void zero_user_segments(struct page *page, |
147 | unsigned start1, unsigned end1, | |
148 | unsigned start2, unsigned end2) | |
149 | { | |
150 | void *kaddr = kmap_atomic(page, KM_USER0); | |
151 | ||
152 | BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE); | |
153 | ||
154 | if (end1 > start1) | |
155 | memset(kaddr + start1, 0, end1 - start1); | |
156 | ||
157 | if (end2 > start2) | |
158 | memset(kaddr + start2, 0, end2 - start2); | |
159 | ||
160 | kunmap_atomic(kaddr, KM_USER0); | |
161 | flush_dcache_page(page); | |
162 | } | |
163 | ||
164 | static inline void zero_user_segment(struct page *page, | |
165 | unsigned start, unsigned end) | |
166 | { | |
167 | zero_user_segments(page, start, end, 0, 0); | |
168 | } | |
169 | ||
170 | static inline void zero_user(struct page *page, | |
171 | unsigned start, unsigned size) | |
172 | { | |
173 | zero_user_segments(page, start, start + size, 0, 0); | |
174 | } | |
01f2705d | 175 | |
f37bc271 | 176 | static inline void __deprecated memclear_highpage_flush(struct page *page, |
01f2705d | 177 | unsigned int offset, unsigned int size) |
1da177e4 | 178 | { |
eebd2aa3 | 179 | zero_user(page, offset, size); |
1da177e4 LT |
180 | } |
181 | ||
77fff4ae AN |
182 | #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE |
183 | ||
9de455b2 AN |
184 | static inline void copy_user_highpage(struct page *to, struct page *from, |
185 | unsigned long vaddr, struct vm_area_struct *vma) | |
1da177e4 LT |
186 | { |
187 | char *vfrom, *vto; | |
188 | ||
189 | vfrom = kmap_atomic(from, KM_USER0); | |
190 | vto = kmap_atomic(to, KM_USER1); | |
191 | copy_user_page(vto, vfrom, vaddr, to); | |
192 | kunmap_atomic(vfrom, KM_USER0); | |
193 | kunmap_atomic(vto, KM_USER1); | |
1da177e4 LT |
194 | } |
195 | ||
77fff4ae AN |
196 | #endif |
197 | ||
1da177e4 LT |
198 | static inline void copy_highpage(struct page *to, struct page *from) |
199 | { | |
200 | char *vfrom, *vto; | |
201 | ||
202 | vfrom = kmap_atomic(from, KM_USER0); | |
203 | vto = kmap_atomic(to, KM_USER1); | |
204 | copy_page(vto, vfrom); | |
205 | kunmap_atomic(vfrom, KM_USER0); | |
206 | kunmap_atomic(vto, KM_USER1); | |
207 | } | |
208 | ||
209 | #endif /* _LINUX_HIGHMEM_H */ |