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