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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _LINUX_HIGHMEM_H |
| 2 | #define _LINUX_HIGHMEM_H |
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| 3 | |||
| 4 | #include <linux/config.h> |
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| 5 | #include <linux/fs.h> |
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| 6 | #include <linux/mm.h> |
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| 7 | |||
| 8 | #include <asm/cacheflush.h> |
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| 9 | |||
| 10 | #ifdef CONFIG_HIGHMEM |
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| 11 | |||
| 12 | extern struct page *highmem_start_page; |
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| 13 | |||
| 14 | #include <asm/highmem.h> |
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| 15 | |||
| 16 | /* declarations for linux/mm/highmem.c */ |
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| 17 | unsigned int nr_free_highpages(void); |
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| 18 | |||
| 19 | #else /* CONFIG_HIGHMEM */ |
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| 20 | |||
| 21 | static inline unsigned int nr_free_highpages(void) { return 0; } |
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| 22 | |||
| 23 | static inline void *kmap(struct page *page) |
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| 24 | { |
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| 25 | might_sleep(); |
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| 26 | return page_address(page); |
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| 27 | } |
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| 28 | |||
| 29 | #define kunmap(page) do { (void) (page); } while (0) |
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| 30 | |||
| 31 | #define kmap_atomic(page, idx) page_address(page) |
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| 32 | #define kunmap_atomic(addr, idx) do { } while (0) |
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| 33 | #define kmap_atomic_to_page(ptr) virt_to_page(ptr) |
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| 34 | |||
| 35 | #endif /* CONFIG_HIGHMEM */ |
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| 36 | |||
| 37 | /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ |
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| 38 | static inline void clear_user_highpage(struct page *page, unsigned long vaddr) |
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| 39 | { |
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| 40 | void *addr = kmap_atomic(page, KM_USER0); |
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| 41 | clear_user_page(addr, vaddr, page); |
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| 42 | kunmap_atomic(addr, KM_USER0); |
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| 43 | } |
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| 44 | |||
| 45 | static inline void clear_highpage(struct page *page) |
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| 46 | { |
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| 47 | void *kaddr = kmap_atomic(page, KM_USER0); |
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| 48 | clear_page(kaddr); |
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| 49 | kunmap_atomic(kaddr, KM_USER0); |
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| 50 | } |
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| 51 | |||
| 52 | /* |
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| 53 | * Same but also flushes aliased cache contents to RAM. |
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| 54 | */ |
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| 55 | static inline void memclear_highpage_flush(struct page *page, unsigned int offset, unsigned int size) |
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| 56 | { |
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| 57 | void *kaddr; |
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| 58 | |||
| 59 | if (offset + size > PAGE_SIZE) |
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| 60 | BUG(); |
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| 61 | |||
| 62 | kaddr = kmap_atomic(page, KM_USER0); |
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| 63 | memset((char *)kaddr + offset, 0, size); |
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| 64 | flush_dcache_page(page); |
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| 65 | kunmap_atomic(kaddr, KM_USER0); |
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| 66 | } |
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| 67 | |||
| 68 | static inline void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr) |
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| 69 | { |
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| 70 | char *vfrom, *vto; |
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| 71 | |||
| 72 | vfrom = kmap_atomic(from, KM_USER0); |
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| 73 | vto = kmap_atomic(to, KM_USER1); |
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| 74 | copy_user_page(vto, vfrom, vaddr, to); |
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| 75 | kunmap_atomic(vfrom, KM_USER0); |
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| 76 | kunmap_atomic(vto, KM_USER1); |
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| 77 | } |
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| 78 | |||
| 79 | static inline void copy_highpage(struct page *to, struct page *from) |
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| 80 | { |
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| 81 | char *vfrom, *vto; |
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| 82 | |||
| 83 | vfrom = kmap_atomic(from, KM_USER0); |
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| 84 | vto = kmap_atomic(to, KM_USER1); |
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| 85 | copy_page(vto, vfrom); |
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| 86 | kunmap_atomic(vfrom, KM_USER0); |
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| 87 | kunmap_atomic(vto, KM_USER1); |
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| 88 | } |
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| 89 | |||
| 90 | #endif /* _LINUX_HIGHMEM_H */ |