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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | #ifndef _LINUX_HIGHMEM_H #define _LINUX_HIGHMEM_H #include <linux/config.h> #include <asm/pgalloc.h> #ifdef CONFIG_HIGHMEM extern struct page *highmem_start_page; #include <asm/highmem.h> /* declarations for linux/mm/highmem.c */ FASTCALL(unsigned int nr_free_highpages(void)); extern struct page * prepare_highmem_swapout(struct page *); extern struct page * replace_with_highmem(struct page *); extern struct buffer_head * create_bounce(int rw, struct buffer_head * bh_orig); #else /* CONFIG_HIGHMEM */ static inline unsigned int nr_free_highpages(void) { return 0; } #define prepare_highmem_swapout(page) page #define replace_with_highmem(page) page static __inline__ unsigned long kmap(struct page * page) { return (unsigned long) page_address(page); } #define kunmap(page) do { } while (0) #define kmap_atomic(page,idx) kmap(page) #define kunmap_atomic(page,idx) kunmap(page) #endif /* CONFIG_HIGHMEM */ /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ static inline void clear_user_highpage(struct page *page, unsigned long vaddr) { unsigned long kaddr; kaddr = kmap(page); clear_user_page((void *)kaddr, vaddr); kunmap(page); } static inline void clear_highpage(struct page *page) { unsigned long kaddr; kaddr = kmap(page); clear_page((void *)kaddr); kunmap(page); } static inline void memclear_highpage(struct page *page, unsigned int offset, unsigned int size) { unsigned long kaddr; if (offset + size > PAGE_SIZE) BUG(); kaddr = kmap(page); memset((void *)(kaddr + offset), 0, size); kunmap(page); } /* * Same but also flushes aliased cache contents to RAM. */ static inline void memclear_highpage_flush(struct page *page, unsigned int offset, unsigned int size) { unsigned long kaddr; if (offset + size > PAGE_SIZE) BUG(); kaddr = kmap(page); memset((void *)(kaddr + offset), 0, size); flush_page_to_ram(page); kunmap(page); } static inline void copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr) { unsigned long vfrom, vto; vfrom = kmap(from); vto = kmap(to); copy_user_page((void *)vto, (void *)vfrom, vaddr); kunmap(from); kunmap(to); } static inline void copy_highpage(struct page *to, struct page *from) { unsigned long vfrom, vto; vfrom = kmap(from); vto = kmap(to); copy_page((void *)vto, (void *)vfrom); kunmap(from); kunmap(to); } #endif /* _LINUX_HIGHMEM_H */ |