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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/highmem.h
1 #ifndef _LINUX_HIGHMEM_H
2 #define _LINUX_HIGHMEM_H
7 #include <asm/cacheflush.h>
9 #ifndef ARCH_HAS_FLUSH_ANON_PAGE
10 static inline void flush_anon_page(struct page
*page
, unsigned long vmaddr
)
15 #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
16 static inline void flush_kernel_dcache_page(struct page
*page
)
23 #include <asm/highmem.h>
25 /* declarations for linux/mm/highmem.c */
26 unsigned int nr_free_highpages(void);
27 extern unsigned long totalhigh_pages
;
29 #else /* CONFIG_HIGHMEM */
31 static inline unsigned int nr_free_highpages(void) { return 0; }
33 #define totalhigh_pages 0
36 static inline void *kmap(struct page
*page
)
39 return page_address(page
);
42 #define kunmap(page) do { (void) (page); } while (0)
44 #define kmap_atomic(page, idx) page_address(page)
45 #define kunmap_atomic(addr, idx) do { } while (0)
46 #define kmap_atomic_pfn(pfn, idx) page_address(pfn_to_page(pfn))
47 #define kmap_atomic_to_page(ptr) virt_to_page(ptr)
50 #endif /* CONFIG_HIGHMEM */
52 /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
53 static inline void clear_user_highpage(struct page
*page
, unsigned long vaddr
)
55 void *addr
= kmap_atomic(page
, KM_USER0
);
56 clear_user_page(addr
, vaddr
, page
);
57 kunmap_atomic(addr
, KM_USER0
);
58 /* Make sure this page is cleared on other CPU's too before using it */
62 #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
63 static inline struct page
*
64 alloc_zeroed_user_highpage(struct vm_area_struct
*vma
, unsigned long vaddr
)
66 struct page
*page
= alloc_page_vma(GFP_HIGHUSER
, vma
, vaddr
);
69 clear_user_highpage(page
, vaddr
);
75 static inline void clear_highpage(struct page
*page
)
77 void *kaddr
= kmap_atomic(page
, KM_USER0
);
79 kunmap_atomic(kaddr
, KM_USER0
);
83 * Same but also flushes aliased cache contents to RAM.
85 static inline void memclear_highpage_flush(struct page
*page
, unsigned int offset
, unsigned int size
)
89 BUG_ON(offset
+ size
> PAGE_SIZE
);
91 kaddr
= kmap_atomic(page
, KM_USER0
);
92 memset((char *)kaddr
+ offset
, 0, size
);
93 flush_dcache_page(page
);
94 kunmap_atomic(kaddr
, KM_USER0
);
97 static inline void copy_user_highpage(struct page
*to
, struct page
*from
, unsigned long vaddr
)
101 vfrom
= kmap_atomic(from
, KM_USER0
);
102 vto
= kmap_atomic(to
, KM_USER1
);
103 copy_user_page(vto
, vfrom
, vaddr
, to
);
104 kunmap_atomic(vfrom
, KM_USER0
);
105 kunmap_atomic(vto
, KM_USER1
);
106 /* Make sure this page is cleared on other CPU's too before using it */
110 static inline void copy_highpage(struct page
*to
, struct page
*from
)
114 vfrom
= kmap_atomic(from
, KM_USER0
);
115 vto
= kmap_atomic(to
, KM_USER1
);
116 copy_page(vto
, vfrom
);
117 kunmap_atomic(vfrom
, KM_USER0
);
118 kunmap_atomic(vto
, KM_USER1
);
121 #endif /* _LINUX_HIGHMEM_H */