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TOMOYO Linux Cross Reference
Linux/include/linux/highmem.h

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  1 #ifndef _LINUX_HIGHMEM_H
  2 #define _LINUX_HIGHMEM_H
  3 
  4 #include <linux/fs.h>
  5 #include <linux/kernel.h>
  6 #include <linux/bug.h>
  7 #include <linux/mm.h>
  8 #include <linux/uaccess.h>
  9 #include <linux/hardirq.h>
 10 
 11 #include <asm/cacheflush.h>
 12 
 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)
 15 {
 16 }
 17 #endif
 18 
 19 #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
 20 static inline void flush_kernel_dcache_page(struct page *page)
 21 {
 22 }
 23 static inline void flush_kernel_vmap_range(void *vaddr, int size)
 24 {
 25 }
 26 static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
 27 {
 28 }
 29 #endif
 30 
 31 #include <asm/kmap_types.h>
 32 
 33 #ifdef CONFIG_HIGHMEM
 34 #include <asm/highmem.h>
 35 
 36 /* declarations for linux/mm/highmem.c */
 37 unsigned int nr_free_highpages(void);
 38 extern unsigned long totalhigh_pages;
 39 
 40 void kmap_flush_unused(void);
 41 
 42 struct page *kmap_to_page(void *addr);
 43 
 44 #else /* CONFIG_HIGHMEM */
 45 
 46 static inline unsigned int nr_free_highpages(void) { return 0; }
 47 
 48 static inline struct page *kmap_to_page(void *addr)
 49 {
 50         return virt_to_page(addr);
 51 }
 52 
 53 #define totalhigh_pages 0UL
 54 
 55 #ifndef ARCH_HAS_KMAP
 56 static inline void *kmap(struct page *page)
 57 {
 58         might_sleep();
 59         return page_address(page);
 60 }
 61 
 62 static inline void kunmap(struct page *page)
 63 {
 64 }
 65 
 66 static inline void *kmap_atomic(struct page *page)
 67 {
 68         pagefault_disable();
 69         return page_address(page);
 70 }
 71 #define kmap_atomic_prot(page, prot)    kmap_atomic(page)
 72 
 73 static inline void __kunmap_atomic(void *addr)
 74 {
 75         pagefault_enable();
 76 }
 77 
 78 #define kmap_atomic_pfn(pfn)    kmap_atomic(pfn_to_page(pfn))
 79 #define kmap_atomic_to_page(ptr)        virt_to_page(ptr)
 80 
 81 #define kmap_flush_unused()     do {} while(0)
 82 #endif
 83 
 84 #endif /* CONFIG_HIGHMEM */
 85 
 86 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
 87 
 88 DECLARE_PER_CPU(int, __kmap_atomic_idx);
 89 
 90 static inline int kmap_atomic_idx_push(void)
 91 {
 92         int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1;
 93 
 94 #ifdef CONFIG_DEBUG_HIGHMEM
 95         WARN_ON_ONCE(in_irq() && !irqs_disabled());
 96         BUG_ON(idx > KM_TYPE_NR);
 97 #endif
 98         return idx;
 99 }
100 
101 static inline int kmap_atomic_idx(void)
102 {
103         return __this_cpu_read(__kmap_atomic_idx) - 1;
104 }
105 
106 static inline void kmap_atomic_idx_pop(void)
107 {
108 #ifdef CONFIG_DEBUG_HIGHMEM
109         int idx = __this_cpu_dec_return(__kmap_atomic_idx);
110 
111         BUG_ON(idx < 0);
112 #else
113         __this_cpu_dec(__kmap_atomic_idx);
114 #endif
115 }
116 
117 #endif
118 
119 /*
120  * Prevent people trying to call kunmap_atomic() as if it were kunmap()
121  * kunmap_atomic() should get the return value of kmap_atomic, not the page.
122  */
123 #define kunmap_atomic(addr)                                     \
124 do {                                                            \
125         BUILD_BUG_ON(__same_type((addr), struct page *));       \
126         __kunmap_atomic(addr);                                  \
127 } while (0)
128 
129 
130 /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
131 #ifndef clear_user_highpage
132 static inline void clear_user_highpage(struct page *page, unsigned long vaddr)
133 {
134         void *addr = kmap_atomic(page);
135         clear_user_page(addr, vaddr, page);
136         kunmap_atomic(addr);
137 }
138 #endif
139 
140 #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
141 /**
142  * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags
143  * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE
144  * @vma: The VMA the page is to be allocated for
145  * @vaddr: The virtual address the page will be inserted into
146  *
147  * This function will allocate a page for a VMA but the caller is expected
148  * to specify via movableflags whether the page will be movable in the
149  * future or not
150  *
151  * An architecture may override this function by defining
152  * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own
153  * implementation.
154  */
155 static inline struct page *
156 __alloc_zeroed_user_highpage(gfp_t movableflags,
157                         struct vm_area_struct *vma,
158                         unsigned long vaddr)
159 {
160         struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags,
161                         vma, vaddr);
162 
163         if (page)
164                 clear_user_highpage(page, vaddr);
165 
166         return page;
167 }
168 #endif
169 
170 /**
171  * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move
172  * @vma: The VMA the page is to be allocated for
173  * @vaddr: The virtual address the page will be inserted into
174  *
175  * This function will allocate a page for a VMA that the caller knows will
176  * be able to migrate in the future using move_pages() or reclaimed
177  */
178 static inline struct page *
179 alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
180                                         unsigned long vaddr)
181 {
182         return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr);
183 }
184 
185 static inline void clear_highpage(struct page *page)
186 {
187         void *kaddr = kmap_atomic(page);
188         clear_page(kaddr);
189         kunmap_atomic(kaddr);
190 }
191 
192 static inline void zero_user_segments(struct page *page,
193         unsigned start1, unsigned end1,
194         unsigned start2, unsigned end2)
195 {
196         void *kaddr = kmap_atomic(page);
197 
198         BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE);
199 
200         if (end1 > start1)
201                 memset(kaddr + start1, 0, end1 - start1);
202 
203         if (end2 > start2)
204                 memset(kaddr + start2, 0, end2 - start2);
205 
206         kunmap_atomic(kaddr);
207         flush_dcache_page(page);
208 }
209 
210 static inline void zero_user_segment(struct page *page,
211         unsigned start, unsigned end)
212 {
213         zero_user_segments(page, start, end, 0, 0);
214 }
215 
216 static inline void zero_user(struct page *page,
217         unsigned start, unsigned size)
218 {
219         zero_user_segments(page, start, start + size, 0, 0);
220 }
221 
222 static inline void __deprecated memclear_highpage_flush(struct page *page,
223                         unsigned int offset, unsigned int size)
224 {
225         zero_user(page, offset, size);
226 }
227 
228 #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE
229 
230 static inline void copy_user_highpage(struct page *to, struct page *from,
231         unsigned long vaddr, struct vm_area_struct *vma)
232 {
233         char *vfrom, *vto;
234 
235         vfrom = kmap_atomic(from);
236         vto = kmap_atomic(to);
237         copy_user_page(vto, vfrom, vaddr, to);
238         kunmap_atomic(vto);
239         kunmap_atomic(vfrom);
240 }
241 
242 #endif
243 
244 static inline void copy_highpage(struct page *to, struct page *from)
245 {
246         char *vfrom, *vto;
247 
248         vfrom = kmap_atomic(from);
249         vto = kmap_atomic(to);
250         copy_page(vto, vfrom);
251         kunmap_atomic(vto);
252         kunmap_atomic(vfrom);
253 }
254 
255 #endif /* _LINUX_HIGHMEM_H */
256 

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