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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         preempt_disable();
 69         pagefault_disable();
 70         return page_address(page);
 71 }
 72 #define kmap_atomic_prot(page, prot)    kmap_atomic(page)
 73 
 74 static inline void __kunmap_atomic(void *addr)
 75 {
 76         pagefault_enable();
 77         preempt_enable();
 78 }
 79 
 80 #define kmap_atomic_pfn(pfn)    kmap_atomic(pfn_to_page(pfn))
 81 
 82 #define kmap_flush_unused()     do {} while(0)
 83 #endif
 84 
 85 #endif /* CONFIG_HIGHMEM */
 86 
 87 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
 88 
 89 DECLARE_PER_CPU(int, __kmap_atomic_idx);
 90 
 91 static inline int kmap_atomic_idx_push(void)
 92 {
 93         int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1;
 94 
 95 #ifdef CONFIG_DEBUG_HIGHMEM
 96         WARN_ON_ONCE(in_irq() && !irqs_disabled());
 97         BUG_ON(idx >= KM_TYPE_NR);
 98 #endif
 99         return idx;
100 }
101 
102 static inline int kmap_atomic_idx(void)
103 {
104         return __this_cpu_read(__kmap_atomic_idx) - 1;
105 }
106 
107 static inline void kmap_atomic_idx_pop(void)
108 {
109 #ifdef CONFIG_DEBUG_HIGHMEM
110         int idx = __this_cpu_dec_return(__kmap_atomic_idx);
111 
112         BUG_ON(idx < 0);
113 #else
114         __this_cpu_dec(__kmap_atomic_idx);
115 #endif
116 }
117 
118 #endif
119 
120 /*
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.
123  */
124 #define kunmap_atomic(addr)                                     \
125 do {                                                            \
126         BUILD_BUG_ON(__same_type((addr), struct page *));       \
127         __kunmap_atomic(addr);                                  \
128 } while (0)
129 
130 
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)
134 {
135         void *addr = kmap_atomic(page);
136         clear_user_page(addr, vaddr, page);
137         kunmap_atomic(addr);
138 }
139 #endif
140 
141 #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
142 /**
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
147  *
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
150  * future or not
151  *
152  * An architecture may override this function by defining
153  * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own
154  * implementation.
155  */
156 static inline struct page *
157 __alloc_zeroed_user_highpage(gfp_t movableflags,
158                         struct vm_area_struct *vma,
159                         unsigned long vaddr)
160 {
161         struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags,
162                         vma, vaddr);
163 
164         if (page)
165                 clear_user_highpage(page, vaddr);
166 
167         return page;
168 }
169 #endif
170 
171 /**
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
175  *
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
178  */
179 static inline struct page *
180 alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
181                                         unsigned long vaddr)
182 {
183         return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr);
184 }
185 
186 static inline void clear_highpage(struct page *page)
187 {
188         void *kaddr = kmap_atomic(page);
189         clear_page(kaddr);
190         kunmap_atomic(kaddr);
191 }
192 
193 static inline void zero_user_segments(struct page *page,
194         unsigned start1, unsigned end1,
195         unsigned start2, unsigned end2)
196 {
197         void *kaddr = kmap_atomic(page);
198 
199         BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE);
200 
201         if (end1 > start1)
202                 memset(kaddr + start1, 0, end1 - start1);
203 
204         if (end2 > start2)
205                 memset(kaddr + start2, 0, end2 - start2);
206 
207         kunmap_atomic(kaddr);
208         flush_dcache_page(page);
209 }
210 
211 static inline void zero_user_segment(struct page *page,
212         unsigned start, unsigned end)
213 {
214         zero_user_segments(page, start, end, 0, 0);
215 }
216 
217 static inline void zero_user(struct page *page,
218         unsigned start, unsigned size)
219 {
220         zero_user_segments(page, start, start + size, 0, 0);
221 }
222 
223 #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE
224 
225 static inline void copy_user_highpage(struct page *to, struct page *from,
226         unsigned long vaddr, struct vm_area_struct *vma)
227 {
228         char *vfrom, *vto;
229 
230         vfrom = kmap_atomic(from);
231         vto = kmap_atomic(to);
232         copy_user_page(vto, vfrom, vaddr, to);
233         kunmap_atomic(vto);
234         kunmap_atomic(vfrom);
235 }
236 
237 #endif
238 
239 static inline void copy_highpage(struct page *to, struct page *from)
240 {
241         char *vfrom, *vto;
242 
243         vfrom = kmap_atomic(from);
244         vto = kmap_atomic(to);
245         copy_page(vto, vfrom);
246         kunmap_atomic(vto);
247         kunmap_atomic(vfrom);
248 }
249 
250 #endif /* _LINUX_HIGHMEM_H */
251 

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