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