1 #ifndef _LINUX_HIGHMEM_H
2 #define _LINUX_HIGHMEM_H
5 #include <linux/kernel.h>
8 #include <linux/uaccess.h>
9 #include <linux/hardirq.h>
11 #include <asm/cacheflush.h>
13 #ifndef ARCH_HAS_FLUSH_ANON_PAGE
14 static inline void flush_anon_page(struct vm_area_struct
*vma
, struct page
*page
, unsigned long vmaddr
)
19 #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
20 static inline void flush_kernel_dcache_page(struct page
*page
)
23 static inline void flush_kernel_vmap_range(void *vaddr
, int size
)
26 static inline void invalidate_kernel_vmap_range(void *vaddr
, int size
)
31 #include <asm/kmap_types.h>
34 #include <asm/highmem.h>
36 /* declarations for linux/mm/highmem.c */
37 unsigned int nr_free_highpages(void);
38 extern unsigned long totalhigh_pages
;
40 void kmap_flush_unused(void);
42 struct page
*kmap_to_page(void *addr
);
44 #else /* CONFIG_HIGHMEM */
46 static inline unsigned int nr_free_highpages(void) { return 0; }
48 static inline struct page
*kmap_to_page(void *addr
)
50 return virt_to_page(addr
);
53 #define totalhigh_pages 0UL
56 static inline void *kmap(struct page
*page
)
59 return page_address(page
);
62 static inline void kunmap(struct page
*page
)
66 static inline void *kmap_atomic(struct page
*page
)
70 return page_address(page
);
72 #define kmap_atomic_prot(page, prot) kmap_atomic(page)
74 static inline void __kunmap_atomic(void *addr
)
80 #define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn))
82 #define kmap_flush_unused() do {} while(0)
85 #endif /* CONFIG_HIGHMEM */
87 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
89 DECLARE_PER_CPU(int, __kmap_atomic_idx
);
91 static inline int kmap_atomic_idx_push(void)
93 int idx
= __this_cpu_inc_return(__kmap_atomic_idx
) - 1;
95 #ifdef CONFIG_DEBUG_HIGHMEM
96 WARN_ON_ONCE(in_irq() && !irqs_disabled());
97 BUG_ON(idx
>= KM_TYPE_NR
);
102 static inline int kmap_atomic_idx(void)
104 return __this_cpu_read(__kmap_atomic_idx
) - 1;
107 static inline void kmap_atomic_idx_pop(void)
109 #ifdef CONFIG_DEBUG_HIGHMEM
110 int idx
= __this_cpu_dec_return(__kmap_atomic_idx
);
114 __this_cpu_dec(__kmap_atomic_idx
);
121 * Prevent people trying to call kunmap_atomic() as if it were kunmap()
122 * kunmap_atomic() should get the return value of kmap_atomic, not the page.
124 #define kunmap_atomic(addr) \
126 BUILD_BUG_ON(__same_type((addr), struct page *)); \
127 __kunmap_atomic(addr); \
131 /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
132 #ifndef clear_user_highpage
133 static inline void clear_user_highpage(struct page
*page
, unsigned long vaddr
)
135 void *addr
= kmap_atomic(page
);
136 clear_user_page(addr
, vaddr
, page
);
141 #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
143 * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags
144 * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE
145 * @vma: The VMA the page is to be allocated for
146 * @vaddr: The virtual address the page will be inserted into
148 * This function will allocate a page for a VMA but the caller is expected
149 * to specify via movableflags whether the page will be movable in the
152 * An architecture may override this function by defining
153 * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own
156 static inline struct page
*
157 __alloc_zeroed_user_highpage(gfp_t movableflags
,
158 struct vm_area_struct
*vma
,
161 struct page
*page
= alloc_page_vma(GFP_HIGHUSER
| movableflags
,
165 clear_user_highpage(page
, vaddr
);
172 * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move
173 * @vma: The VMA the page is to be allocated for
174 * @vaddr: The virtual address the page will be inserted into
176 * This function will allocate a page for a VMA that the caller knows will
177 * be able to migrate in the future using move_pages() or reclaimed
179 static inline struct page
*
180 alloc_zeroed_user_highpage_movable(struct vm_area_struct
*vma
,
183 return __alloc_zeroed_user_highpage(__GFP_MOVABLE
, vma
, vaddr
);
186 static inline void clear_highpage(struct page
*page
)
188 void *kaddr
= kmap_atomic(page
);
190 kunmap_atomic(kaddr
);
193 static inline void zero_user_segments(struct page
*page
,
194 unsigned start1
, unsigned end1
,
195 unsigned start2
, unsigned end2
)
197 void *kaddr
= kmap_atomic(page
);
199 BUG_ON(end1
> PAGE_SIZE
|| end2
> PAGE_SIZE
);
202 memset(kaddr
+ start1
, 0, end1
- start1
);
205 memset(kaddr
+ start2
, 0, end2
- start2
);
207 kunmap_atomic(kaddr
);
208 flush_dcache_page(page
);
211 static inline void zero_user_segment(struct page
*page
,
212 unsigned start
, unsigned end
)
214 zero_user_segments(page
, start
, end
, 0, 0);
217 static inline void zero_user(struct page
*page
,
218 unsigned start
, unsigned size
)
220 zero_user_segments(page
, start
, start
+ size
, 0, 0);
223 #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE
225 static inline void copy_user_highpage(struct page
*to
, struct page
*from
,
226 unsigned long vaddr
, struct vm_area_struct
*vma
)
230 vfrom
= kmap_atomic(from
);
231 vto
= kmap_atomic(to
);
232 copy_user_page(vto
, vfrom
, vaddr
, to
);
234 kunmap_atomic(vfrom
);
239 static inline void copy_highpage(struct page
*to
, struct page
*from
)
243 vfrom
= kmap_atomic(from
);
244 vto
= kmap_atomic(to
);
245 copy_page(vto
, vfrom
);
247 kunmap_atomic(vfrom
);
250 #endif /* _LINUX_HIGHMEM_H */
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