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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 | ||
ad76fb6b PZ |
47 | #define kmap_atomic(page, idx) \ |
48 | ({ pagefault_disable(); page_address(page); }) | |
ce6234b5 JF |
49 | #define kmap_atomic_prot(page, idx, prot) kmap_atomic(page, idx) |
50 | ||
ad76fb6b PZ |
51 | #define kunmap_atomic(addr, idx) do { pagefault_enable(); } while (0) |
52 | #define kmap_atomic_pfn(pfn, idx) kmap_atomic(pfn_to_page(pfn), (idx)) | |
1da177e4 | 53 | #define kmap_atomic_to_page(ptr) virt_to_page(ptr) |
ce6234b5 JF |
54 | |
55 | #define kmap_flush_unused() do {} while(0) | |
a6ca1b99 | 56 | #endif |
1da177e4 LT |
57 | |
58 | #endif /* CONFIG_HIGHMEM */ | |
59 | ||
60 | /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ | |
61 | static inline void clear_user_highpage(struct page *page, unsigned long vaddr) | |
62 | { | |
63 | void *addr = kmap_atomic(page, KM_USER0); | |
64 | clear_user_page(addr, vaddr, page); | |
65 | kunmap_atomic(addr, KM_USER0); | |
66 | /* Make sure this page is cleared on other CPU's too before using it */ | |
67 | smp_wmb(); | |
68 | } | |
69 | ||
70 | #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE | |
71 | static inline struct page * | |
72 | alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr) | |
73 | { | |
74 | struct page *page = alloc_page_vma(GFP_HIGHUSER, vma, vaddr); | |
75 | ||
76 | if (page) | |
77 | clear_user_highpage(page, vaddr); | |
78 | ||
79 | return page; | |
80 | } | |
81 | #endif | |
82 | ||
83 | static inline void clear_highpage(struct page *page) | |
84 | { | |
85 | void *kaddr = kmap_atomic(page, KM_USER0); | |
86 | clear_page(kaddr); | |
87 | kunmap_atomic(kaddr, KM_USER0); | |
88 | } | |
89 | ||
90 | /* | |
91 | * Same but also flushes aliased cache contents to RAM. | |
92 | */ | |
93 | static inline void memclear_highpage_flush(struct page *page, unsigned int offset, unsigned int size) | |
94 | { | |
95 | void *kaddr; | |
96 | ||
97 | BUG_ON(offset + size > PAGE_SIZE); | |
98 | ||
99 | kaddr = kmap_atomic(page, KM_USER0); | |
100 | memset((char *)kaddr + offset, 0, size); | |
101 | flush_dcache_page(page); | |
102 | kunmap_atomic(kaddr, KM_USER0); | |
103 | } | |
104 | ||
77fff4ae AN |
105 | #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE |
106 | ||
9de455b2 AN |
107 | static inline void copy_user_highpage(struct page *to, struct page *from, |
108 | unsigned long vaddr, struct vm_area_struct *vma) | |
1da177e4 LT |
109 | { |
110 | char *vfrom, *vto; | |
111 | ||
112 | vfrom = kmap_atomic(from, KM_USER0); | |
113 | vto = kmap_atomic(to, KM_USER1); | |
114 | copy_user_page(vto, vfrom, vaddr, to); | |
115 | kunmap_atomic(vfrom, KM_USER0); | |
116 | kunmap_atomic(vto, KM_USER1); | |
117 | /* Make sure this page is cleared on other CPU's too before using it */ | |
118 | smp_wmb(); | |
119 | } | |
120 | ||
77fff4ae AN |
121 | #endif |
122 | ||
1da177e4 LT |
123 | static inline void copy_highpage(struct page *to, struct page *from) |
124 | { | |
125 | char *vfrom, *vto; | |
126 | ||
127 | vfrom = kmap_atomic(from, KM_USER0); | |
128 | vto = kmap_atomic(to, KM_USER1); | |
129 | copy_page(vto, vfrom); | |
130 | kunmap_atomic(vfrom, KM_USER0); | |
131 | kunmap_atomic(vto, KM_USER1); | |
132 | } | |
133 | ||
134 | #endif /* _LINUX_HIGHMEM_H */ |