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1da177e4 LT |
1 | #ifndef _LINUX_HIGHMEM_H |
2 | #define _LINUX_HIGHMEM_H | |
3 | ||
1da177e4 | 4 | #include <linux/fs.h> |
597781f3 | 5 | #include <linux/kernel.h> |
1da177e4 | 6 | #include <linux/mm.h> |
ad76fb6b | 7 | #include <linux/uaccess.h> |
1da177e4 LT |
8 | |
9 | #include <asm/cacheflush.h> | |
10 | ||
03beb076 | 11 | #ifndef ARCH_HAS_FLUSH_ANON_PAGE |
a6f36be3 | 12 | static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr) |
03beb076 JB |
13 | { |
14 | } | |
15 | #endif | |
16 | ||
5a3a5a98 JB |
17 | #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE |
18 | static inline void flush_kernel_dcache_page(struct page *page) | |
19 | { | |
20 | } | |
9df5f741 JB |
21 | static inline void flush_kernel_vmap_range(void *vaddr, int size) |
22 | { | |
23 | } | |
24 | static inline void invalidate_kernel_vmap_range(void *vaddr, int size) | |
25 | { | |
26 | } | |
5a3a5a98 JB |
27 | #endif |
28 | ||
3688e07f KG |
29 | #include <asm/kmap_types.h> |
30 | ||
3688e07f | 31 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
32 | #include <asm/highmem.h> |
33 | ||
34 | /* declarations for linux/mm/highmem.c */ | |
35 | unsigned int nr_free_highpages(void); | |
c1f60a5a | 36 | extern unsigned long totalhigh_pages; |
1da177e4 | 37 | |
ce6234b5 JF |
38 | void kmap_flush_unused(void); |
39 | ||
1da177e4 LT |
40 | #else /* CONFIG_HIGHMEM */ |
41 | ||
42 | static inline unsigned int nr_free_highpages(void) { return 0; } | |
43 | ||
4b529401 | 44 | #define totalhigh_pages 0UL |
c1f60a5a | 45 | |
a6ca1b99 | 46 | #ifndef ARCH_HAS_KMAP |
1da177e4 LT |
47 | static inline void *kmap(struct page *page) |
48 | { | |
49 | might_sleep(); | |
50 | return page_address(page); | |
51 | } | |
52 | ||
31c91132 MW |
53 | static inline void kunmap(struct page *page) |
54 | { | |
55 | } | |
1da177e4 | 56 | |
3e4d3af5 | 57 | static inline void *__kmap_atomic(struct page *page) |
254f9c5c GU |
58 | { |
59 | pagefault_disable(); | |
60 | return page_address(page); | |
61 | } | |
3e4d3af5 | 62 | #define kmap_atomic_prot(page, prot) __kmap_atomic(page) |
254f9c5c | 63 | |
3e4d3af5 | 64 | static inline void __kunmap_atomic(void *addr) |
4e60c86b AK |
65 | { |
66 | pagefault_enable(); | |
67 | } | |
68 | ||
3e4d3af5 | 69 | #define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) |
1da177e4 | 70 | #define kmap_atomic_to_page(ptr) virt_to_page(ptr) |
ce6234b5 JF |
71 | |
72 | #define kmap_flush_unused() do {} while(0) | |
a6ca1b99 | 73 | #endif |
1da177e4 LT |
74 | |
75 | #endif /* CONFIG_HIGHMEM */ | |
76 | ||
a8e23a29 PZ |
77 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) |
78 | ||
79 | DECLARE_PER_CPU(int, __kmap_atomic_idx); | |
80 | ||
81 | static inline int kmap_atomic_idx_push(void) | |
82 | { | |
83 | int idx = __get_cpu_var(__kmap_atomic_idx)++; | |
84 | #ifdef CONFIG_DEBUG_HIGHMEM | |
85 | WARN_ON_ONCE(in_irq() && !irqs_disabled()); | |
86 | BUG_ON(idx > KM_TYPE_NR); | |
87 | #endif | |
88 | return idx; | |
89 | } | |
90 | ||
91 | static inline int kmap_atomic_idx_pop(void) | |
92 | { | |
93 | int idx = --__get_cpu_var(__kmap_atomic_idx); | |
94 | #ifdef CONFIG_DEBUG_HIGHMEM | |
95 | BUG_ON(idx < 0); | |
96 | #endif | |
97 | return idx; | |
98 | } | |
99 | ||
100 | #endif | |
101 | ||
3e4d3af5 PZ |
102 | /* |
103 | * Make both: kmap_atomic(page, idx) and kmap_atomic(page) work. | |
104 | */ | |
105 | #define kmap_atomic(page, args...) __kmap_atomic(page) | |
106 | ||
107 | /* | |
108 | * Prevent people trying to call kunmap_atomic() as if it were kunmap() | |
109 | * kunmap_atomic() should get the return value of kmap_atomic, not the page. | |
110 | */ | |
111 | #define kunmap_atomic(addr, args...) \ | |
112 | do { \ | |
113 | BUILD_BUG_ON(__same_type((addr), struct page *)); \ | |
114 | __kunmap_atomic(addr); \ | |
115 | } while (0) | |
597781f3 | 116 | |
1da177e4 | 117 | /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ |
487ff320 | 118 | #ifndef clear_user_highpage |
1da177e4 LT |
119 | static inline void clear_user_highpage(struct page *page, unsigned long vaddr) |
120 | { | |
121 | void *addr = kmap_atomic(page, KM_USER0); | |
122 | clear_user_page(addr, vaddr, page); | |
123 | kunmap_atomic(addr, KM_USER0); | |
1da177e4 | 124 | } |
487ff320 | 125 | #endif |
1da177e4 LT |
126 | |
127 | #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE | |
769848c0 MG |
128 | /** |
129 | * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags | |
130 | * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE | |
131 | * @vma: The VMA the page is to be allocated for | |
132 | * @vaddr: The virtual address the page will be inserted into | |
133 | * | |
134 | * This function will allocate a page for a VMA but the caller is expected | |
135 | * to specify via movableflags whether the page will be movable in the | |
136 | * future or not | |
137 | * | |
138 | * An architecture may override this function by defining | |
139 | * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own | |
140 | * implementation. | |
141 | */ | |
1da177e4 | 142 | static inline struct page * |
769848c0 MG |
143 | __alloc_zeroed_user_highpage(gfp_t movableflags, |
144 | struct vm_area_struct *vma, | |
145 | unsigned long vaddr) | |
1da177e4 | 146 | { |
769848c0 MG |
147 | struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags, |
148 | vma, vaddr); | |
1da177e4 LT |
149 | |
150 | if (page) | |
151 | clear_user_highpage(page, vaddr); | |
152 | ||
153 | return page; | |
154 | } | |
155 | #endif | |
156 | ||
769848c0 MG |
157 | /** |
158 | * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move | |
159 | * @vma: The VMA the page is to be allocated for | |
160 | * @vaddr: The virtual address the page will be inserted into | |
161 | * | |
162 | * This function will allocate a page for a VMA that the caller knows will | |
163 | * be able to migrate in the future using move_pages() or reclaimed | |
164 | */ | |
165 | static inline struct page * | |
166 | alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, | |
167 | unsigned long vaddr) | |
168 | { | |
169 | return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); | |
170 | } | |
171 | ||
1da177e4 LT |
172 | static inline void clear_highpage(struct page *page) |
173 | { | |
174 | void *kaddr = kmap_atomic(page, KM_USER0); | |
175 | clear_page(kaddr); | |
176 | kunmap_atomic(kaddr, KM_USER0); | |
177 | } | |
178 | ||
eebd2aa3 CL |
179 | static inline void zero_user_segments(struct page *page, |
180 | unsigned start1, unsigned end1, | |
181 | unsigned start2, unsigned end2) | |
182 | { | |
183 | void *kaddr = kmap_atomic(page, KM_USER0); | |
184 | ||
185 | BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE); | |
186 | ||
187 | if (end1 > start1) | |
188 | memset(kaddr + start1, 0, end1 - start1); | |
189 | ||
190 | if (end2 > start2) | |
191 | memset(kaddr + start2, 0, end2 - start2); | |
192 | ||
193 | kunmap_atomic(kaddr, KM_USER0); | |
194 | flush_dcache_page(page); | |
195 | } | |
196 | ||
197 | static inline void zero_user_segment(struct page *page, | |
198 | unsigned start, unsigned end) | |
199 | { | |
200 | zero_user_segments(page, start, end, 0, 0); | |
201 | } | |
202 | ||
203 | static inline void zero_user(struct page *page, | |
204 | unsigned start, unsigned size) | |
205 | { | |
206 | zero_user_segments(page, start, start + size, 0, 0); | |
207 | } | |
01f2705d | 208 | |
f37bc271 | 209 | static inline void __deprecated memclear_highpage_flush(struct page *page, |
01f2705d | 210 | unsigned int offset, unsigned int size) |
1da177e4 | 211 | { |
eebd2aa3 | 212 | zero_user(page, offset, size); |
1da177e4 LT |
213 | } |
214 | ||
77fff4ae AN |
215 | #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE |
216 | ||
9de455b2 AN |
217 | static inline void copy_user_highpage(struct page *to, struct page *from, |
218 | unsigned long vaddr, struct vm_area_struct *vma) | |
1da177e4 LT |
219 | { |
220 | char *vfrom, *vto; | |
221 | ||
222 | vfrom = kmap_atomic(from, KM_USER0); | |
223 | vto = kmap_atomic(to, KM_USER1); | |
224 | copy_user_page(vto, vfrom, vaddr, to); | |
1da177e4 | 225 | kunmap_atomic(vto, KM_USER1); |
61ecdb80 | 226 | kunmap_atomic(vfrom, KM_USER0); |
1da177e4 LT |
227 | } |
228 | ||
77fff4ae AN |
229 | #endif |
230 | ||
1da177e4 LT |
231 | static inline void copy_highpage(struct page *to, struct page *from) |
232 | { | |
233 | char *vfrom, *vto; | |
234 | ||
235 | vfrom = kmap_atomic(from, KM_USER0); | |
236 | vto = kmap_atomic(to, KM_USER1); | |
237 | copy_page(vto, vfrom); | |
1da177e4 | 238 | kunmap_atomic(vto, KM_USER1); |
61ecdb80 | 239 | kunmap_atomic(vfrom, KM_USER0); |
1da177e4 LT |
240 | } |
241 | ||
242 | #endif /* _LINUX_HIGHMEM_H */ |