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1da177e4 LT |
1 | #ifndef _LINUX_HIGHMEM_H |
2 | #define _LINUX_HIGHMEM_H | |
3 | ||
1da177e4 | 4 | #include <linux/fs.h> |
597781f3 | 5 | #include <linux/kernel.h> |
1da177e4 | 6 | #include <linux/mm.h> |
ad76fb6b | 7 | #include <linux/uaccess.h> |
1da177e4 LT |
8 | |
9 | #include <asm/cacheflush.h> | |
10 | ||
03beb076 | 11 | #ifndef ARCH_HAS_FLUSH_ANON_PAGE |
a6f36be3 | 12 | static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr) |
03beb076 JB |
13 | { |
14 | } | |
15 | #endif | |
16 | ||
5a3a5a98 JB |
17 | #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE |
18 | static inline void flush_kernel_dcache_page(struct page *page) | |
19 | { | |
20 | } | |
9df5f741 JB |
21 | static inline void flush_kernel_vmap_range(void *vaddr, int size) |
22 | { | |
23 | } | |
24 | static inline void invalidate_kernel_vmap_range(void *vaddr, int size) | |
25 | { | |
26 | } | |
5a3a5a98 JB |
27 | #endif |
28 | ||
3688e07f KG |
29 | #include <asm/kmap_types.h> |
30 | ||
ff3d58c2 | 31 | #ifdef CONFIG_DEBUG_HIGHMEM |
3688e07f KG |
32 | |
33 | void debug_kmap_atomic(enum km_type type); | |
34 | ||
35 | #else | |
1da177e4 | 36 | |
3688e07f KG |
37 | static inline void debug_kmap_atomic(enum km_type type) |
38 | { | |
39 | } | |
40 | ||
41 | #endif | |
42 | ||
43 | #ifdef CONFIG_HIGHMEM | |
1da177e4 LT |
44 | #include <asm/highmem.h> |
45 | ||
46 | /* declarations for linux/mm/highmem.c */ | |
47 | unsigned int nr_free_highpages(void); | |
c1f60a5a | 48 | extern unsigned long totalhigh_pages; |
1da177e4 | 49 | |
ce6234b5 JF |
50 | void kmap_flush_unused(void); |
51 | ||
1da177e4 LT |
52 | #else /* CONFIG_HIGHMEM */ |
53 | ||
54 | static inline unsigned int nr_free_highpages(void) { return 0; } | |
55 | ||
4b529401 | 56 | #define totalhigh_pages 0UL |
c1f60a5a | 57 | |
a6ca1b99 | 58 | #ifndef ARCH_HAS_KMAP |
1da177e4 LT |
59 | static inline void *kmap(struct page *page) |
60 | { | |
61 | might_sleep(); | |
62 | return page_address(page); | |
63 | } | |
64 | ||
31c91132 MW |
65 | static inline void kunmap(struct page *page) |
66 | { | |
67 | } | |
1da177e4 | 68 | |
254f9c5c GU |
69 | static inline void *kmap_atomic(struct page *page, enum km_type idx) |
70 | { | |
71 | pagefault_disable(); | |
72 | return page_address(page); | |
73 | } | |
ce6234b5 | 74 | #define kmap_atomic_prot(page, idx, prot) kmap_atomic(page, idx) |
254f9c5c | 75 | |
597781f3 | 76 | #define kunmap_atomic_notypecheck(addr, idx) do { pagefault_enable(); } while (0) |
ad76fb6b | 77 | #define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx)) |
1da177e4 | 78 | #define kmap_atomic_to_page(ptr) virt_to_page(ptr) |
ce6234b5 JF |
79 | |
80 | #define kmap_flush_unused() do {} while(0) | |
a6ca1b99 | 81 | #endif |
1da177e4 LT |
82 | |
83 | #endif /* CONFIG_HIGHMEM */ | |
84 | ||
597781f3 CEB |
85 | /* Prevent people trying to call kunmap_atomic() as if it were kunmap() */ |
86 | /* kunmap_atomic() should get the return value of kmap_atomic, not the page. */ | |
87 | #define kunmap_atomic(addr, idx) do { \ | |
88 | BUILD_BUG_ON(__same_type((addr), struct page *)); \ | |
89 | kunmap_atomic_notypecheck((addr), (idx)); \ | |
90 | } while (0) | |
91 | ||
1da177e4 | 92 | /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ |
487ff320 | 93 | #ifndef clear_user_highpage |
1da177e4 LT |
94 | static inline void clear_user_highpage(struct page *page, unsigned long vaddr) |
95 | { | |
96 | void *addr = kmap_atomic(page, KM_USER0); | |
97 | clear_user_page(addr, vaddr, page); | |
98 | kunmap_atomic(addr, KM_USER0); | |
1da177e4 | 99 | } |
487ff320 | 100 | #endif |
1da177e4 LT |
101 | |
102 | #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE | |
769848c0 MG |
103 | /** |
104 | * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags | |
105 | * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE | |
106 | * @vma: The VMA the page is to be allocated for | |
107 | * @vaddr: The virtual address the page will be inserted into | |
108 | * | |
109 | * This function will allocate a page for a VMA but the caller is expected | |
110 | * to specify via movableflags whether the page will be movable in the | |
111 | * future or not | |
112 | * | |
113 | * An architecture may override this function by defining | |
114 | * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own | |
115 | * implementation. | |
116 | */ | |
1da177e4 | 117 | static inline struct page * |
769848c0 MG |
118 | __alloc_zeroed_user_highpage(gfp_t movableflags, |
119 | struct vm_area_struct *vma, | |
120 | unsigned long vaddr) | |
1da177e4 | 121 | { |
769848c0 MG |
122 | struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags, |
123 | vma, vaddr); | |
1da177e4 LT |
124 | |
125 | if (page) | |
126 | clear_user_highpage(page, vaddr); | |
127 | ||
128 | return page; | |
129 | } | |
130 | #endif | |
131 | ||
769848c0 MG |
132 | /** |
133 | * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move | |
134 | * @vma: The VMA the page is to be allocated for | |
135 | * @vaddr: The virtual address the page will be inserted into | |
136 | * | |
137 | * This function will allocate a page for a VMA that the caller knows will | |
138 | * be able to migrate in the future using move_pages() or reclaimed | |
139 | */ | |
140 | static inline struct page * | |
141 | alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, | |
142 | unsigned long vaddr) | |
143 | { | |
144 | return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); | |
145 | } | |
146 | ||
1da177e4 LT |
147 | static inline void clear_highpage(struct page *page) |
148 | { | |
149 | void *kaddr = kmap_atomic(page, KM_USER0); | |
150 | clear_page(kaddr); | |
151 | kunmap_atomic(kaddr, KM_USER0); | |
152 | } | |
153 | ||
eebd2aa3 CL |
154 | static inline void zero_user_segments(struct page *page, |
155 | unsigned start1, unsigned end1, | |
156 | unsigned start2, unsigned end2) | |
157 | { | |
158 | void *kaddr = kmap_atomic(page, KM_USER0); | |
159 | ||
160 | BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE); | |
161 | ||
162 | if (end1 > start1) | |
163 | memset(kaddr + start1, 0, end1 - start1); | |
164 | ||
165 | if (end2 > start2) | |
166 | memset(kaddr + start2, 0, end2 - start2); | |
167 | ||
168 | kunmap_atomic(kaddr, KM_USER0); | |
169 | flush_dcache_page(page); | |
170 | } | |
171 | ||
172 | static inline void zero_user_segment(struct page *page, | |
173 | unsigned start, unsigned end) | |
174 | { | |
175 | zero_user_segments(page, start, end, 0, 0); | |
176 | } | |
177 | ||
178 | static inline void zero_user(struct page *page, | |
179 | unsigned start, unsigned size) | |
180 | { | |
181 | zero_user_segments(page, start, start + size, 0, 0); | |
182 | } | |
01f2705d | 183 | |
f37bc271 | 184 | static inline void __deprecated memclear_highpage_flush(struct page *page, |
01f2705d | 185 | unsigned int offset, unsigned int size) |
1da177e4 | 186 | { |
eebd2aa3 | 187 | zero_user(page, offset, size); |
1da177e4 LT |
188 | } |
189 | ||
77fff4ae AN |
190 | #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE |
191 | ||
9de455b2 AN |
192 | static inline void copy_user_highpage(struct page *to, struct page *from, |
193 | unsigned long vaddr, struct vm_area_struct *vma) | |
1da177e4 LT |
194 | { |
195 | char *vfrom, *vto; | |
196 | ||
197 | vfrom = kmap_atomic(from, KM_USER0); | |
198 | vto = kmap_atomic(to, KM_USER1); | |
199 | copy_user_page(vto, vfrom, vaddr, to); | |
200 | kunmap_atomic(vfrom, KM_USER0); | |
201 | kunmap_atomic(vto, KM_USER1); | |
1da177e4 LT |
202 | } |
203 | ||
77fff4ae AN |
204 | #endif |
205 | ||
1da177e4 LT |
206 | static inline void copy_highpage(struct page *to, struct page *from) |
207 | { | |
208 | char *vfrom, *vto; | |
209 | ||
210 | vfrom = kmap_atomic(from, KM_USER0); | |
211 | vto = kmap_atomic(to, KM_USER1); | |
212 | copy_page(vto, vfrom); | |
213 | kunmap_atomic(vfrom, KM_USER0); | |
214 | kunmap_atomic(vto, KM_USER1); | |
215 | } | |
216 | ||
217 | #endif /* _LINUX_HIGHMEM_H */ |