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1da177e4 LT |
1 | #ifndef _LINUX_HIGHMEM_H |
2 | #define _LINUX_HIGHMEM_H | |
3 | ||
4 | #include <linux/config.h> | |
5 | #include <linux/fs.h> | |
6 | #include <linux/mm.h> | |
7 | ||
8 | #include <asm/cacheflush.h> | |
9 | ||
03beb076 JB |
10 | #ifndef ARCH_HAS_FLUSH_ANON_PAGE |
11 | static inline void flush_anon_page(struct page *page, unsigned long vmaddr) | |
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); | |
28 | ||
29 | #else /* CONFIG_HIGHMEM */ | |
30 | ||
31 | static inline unsigned int nr_free_highpages(void) { return 0; } | |
32 | ||
33 | static inline void *kmap(struct page *page) | |
34 | { | |
35 | might_sleep(); | |
36 | return page_address(page); | |
37 | } | |
38 | ||
39 | #define kunmap(page) do { (void) (page); } while (0) | |
40 | ||
41 | #define kmap_atomic(page, idx) page_address(page) | |
42 | #define kunmap_atomic(addr, idx) do { } while (0) | |
60e64d46 | 43 | #define kmap_atomic_pfn(pfn, idx) page_address(pfn_to_page(pfn)) |
1da177e4 LT |
44 | #define kmap_atomic_to_page(ptr) virt_to_page(ptr) |
45 | ||
46 | #endif /* CONFIG_HIGHMEM */ | |
47 | ||
48 | /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ | |
49 | static inline void clear_user_highpage(struct page *page, unsigned long vaddr) | |
50 | { | |
51 | void *addr = kmap_atomic(page, KM_USER0); | |
52 | clear_user_page(addr, vaddr, page); | |
53 | kunmap_atomic(addr, KM_USER0); | |
54 | /* Make sure this page is cleared on other CPU's too before using it */ | |
55 | smp_wmb(); | |
56 | } | |
57 | ||
58 | #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE | |
59 | static inline struct page * | |
60 | alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr) | |
61 | { | |
62 | struct page *page = alloc_page_vma(GFP_HIGHUSER, vma, vaddr); | |
63 | ||
64 | if (page) | |
65 | clear_user_highpage(page, vaddr); | |
66 | ||
67 | return page; | |
68 | } | |
69 | #endif | |
70 | ||
71 | static inline void clear_highpage(struct page *page) | |
72 | { | |
73 | void *kaddr = kmap_atomic(page, KM_USER0); | |
74 | clear_page(kaddr); | |
75 | kunmap_atomic(kaddr, KM_USER0); | |
76 | } | |
77 | ||
78 | /* | |
79 | * Same but also flushes aliased cache contents to RAM. | |
80 | */ | |
81 | static inline void memclear_highpage_flush(struct page *page, unsigned int offset, unsigned int size) | |
82 | { | |
83 | void *kaddr; | |
84 | ||
85 | BUG_ON(offset + size > PAGE_SIZE); | |
86 | ||
87 | kaddr = kmap_atomic(page, KM_USER0); | |
88 | memset((char *)kaddr + offset, 0, size); | |
89 | flush_dcache_page(page); | |
90 | kunmap_atomic(kaddr, KM_USER0); | |
91 | } | |
92 | ||
93 | static inline void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr) | |
94 | { | |
95 | char *vfrom, *vto; | |
96 | ||
97 | vfrom = kmap_atomic(from, KM_USER0); | |
98 | vto = kmap_atomic(to, KM_USER1); | |
99 | copy_user_page(vto, vfrom, vaddr, to); | |
100 | kunmap_atomic(vfrom, KM_USER0); | |
101 | kunmap_atomic(vto, KM_USER1); | |
102 | /* Make sure this page is cleared on other CPU's too before using it */ | |
103 | smp_wmb(); | |
104 | } | |
105 | ||
106 | static inline void copy_highpage(struct page *to, struct page *from) | |
107 | { | |
108 | char *vfrom, *vto; | |
109 | ||
110 | vfrom = kmap_atomic(from, KM_USER0); | |
111 | vto = kmap_atomic(to, KM_USER1); | |
112 | copy_page(vto, vfrom); | |
113 | kunmap_atomic(vfrom, KM_USER0); | |
114 | kunmap_atomic(vto, KM_USER1); | |
115 | } | |
116 | ||
117 | #endif /* _LINUX_HIGHMEM_H */ |