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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> |
43b3a0c7 | 8 | #include <linux/hardirq.h> |
1da177e4 LT |
9 | |
10 | #include <asm/cacheflush.h> | |
11 | ||
03beb076 | 12 | #ifndef ARCH_HAS_FLUSH_ANON_PAGE |
a6f36be3 | 13 | static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr) |
03beb076 JB |
14 | { |
15 | } | |
16 | #endif | |
17 | ||
5a3a5a98 JB |
18 | #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE |
19 | static inline void flush_kernel_dcache_page(struct page *page) | |
20 | { | |
21 | } | |
9df5f741 JB |
22 | static inline void flush_kernel_vmap_range(void *vaddr, int size) |
23 | { | |
24 | } | |
25 | static inline void invalidate_kernel_vmap_range(void *vaddr, int size) | |
26 | { | |
27 | } | |
5a3a5a98 JB |
28 | #endif |
29 | ||
3688e07f KG |
30 | #include <asm/kmap_types.h> |
31 | ||
3688e07f | 32 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
33 | #include <asm/highmem.h> |
34 | ||
35 | /* declarations for linux/mm/highmem.c */ | |
36 | unsigned int nr_free_highpages(void); | |
c1f60a5a | 37 | extern unsigned long totalhigh_pages; |
1da177e4 | 38 | |
ce6234b5 JF |
39 | void kmap_flush_unused(void); |
40 | ||
1da177e4 LT |
41 | #else /* CONFIG_HIGHMEM */ |
42 | ||
43 | static inline unsigned int nr_free_highpages(void) { return 0; } | |
44 | ||
4b529401 | 45 | #define totalhigh_pages 0UL |
c1f60a5a | 46 | |
a6ca1b99 | 47 | #ifndef ARCH_HAS_KMAP |
1da177e4 LT |
48 | static inline void *kmap(struct page *page) |
49 | { | |
50 | might_sleep(); | |
51 | return page_address(page); | |
52 | } | |
53 | ||
31c91132 MW |
54 | static inline void kunmap(struct page *page) |
55 | { | |
56 | } | |
1da177e4 | 57 | |
3e4d3af5 | 58 | static inline void *__kmap_atomic(struct page *page) |
254f9c5c GU |
59 | { |
60 | pagefault_disable(); | |
61 | return page_address(page); | |
62 | } | |
3e4d3af5 | 63 | #define kmap_atomic_prot(page, prot) __kmap_atomic(page) |
254f9c5c | 64 | |
3e4d3af5 | 65 | static inline void __kunmap_atomic(void *addr) |
4e60c86b AK |
66 | { |
67 | pagefault_enable(); | |
68 | } | |
69 | ||
3e4d3af5 | 70 | #define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) |
1da177e4 | 71 | #define kmap_atomic_to_page(ptr) virt_to_page(ptr) |
ce6234b5 JF |
72 | |
73 | #define kmap_flush_unused() do {} while(0) | |
a6ca1b99 | 74 | #endif |
1da177e4 LT |
75 | |
76 | #endif /* CONFIG_HIGHMEM */ | |
77 | ||
a8e23a29 PZ |
78 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) |
79 | ||
80 | DECLARE_PER_CPU(int, __kmap_atomic_idx); | |
81 | ||
82 | static inline int kmap_atomic_idx_push(void) | |
83 | { | |
cfb82434 CL |
84 | int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; |
85 | ||
a8e23a29 PZ |
86 | #ifdef CONFIG_DEBUG_HIGHMEM |
87 | WARN_ON_ONCE(in_irq() && !irqs_disabled()); | |
88 | BUG_ON(idx > KM_TYPE_NR); | |
89 | #endif | |
90 | return idx; | |
91 | } | |
92 | ||
20273941 PZ |
93 | static inline int kmap_atomic_idx(void) |
94 | { | |
cfb82434 | 95 | return __this_cpu_read(__kmap_atomic_idx) - 1; |
20273941 PZ |
96 | } |
97 | ||
cfb82434 | 98 | static inline void kmap_atomic_idx_pop(void) |
a8e23a29 | 99 | { |
a8e23a29 | 100 | #ifdef CONFIG_DEBUG_HIGHMEM |
cfb82434 CL |
101 | int idx = __this_cpu_dec_return(__kmap_atomic_idx); |
102 | ||
a8e23a29 | 103 | BUG_ON(idx < 0); |
cfb82434 CL |
104 | #else |
105 | __this_cpu_dec(__kmap_atomic_idx); | |
a8e23a29 | 106 | #endif |
a8e23a29 PZ |
107 | } |
108 | ||
109 | #endif | |
110 | ||
3e4d3af5 | 111 | /* |
980c19e3 CW |
112 | * NOTE: |
113 | * kmap_atomic() and kunmap_atomic() with two arguments are deprecated. | |
114 | * We only keep them for backward compatibility, any usage of them | |
115 | * are now warned. | |
3e4d3af5 | 116 | */ |
980c19e3 CW |
117 | |
118 | #define PASTE(a, b) a ## b | |
119 | #define PASTE2(a, b) PASTE(a, b) | |
120 | ||
121 | #define NARG_(_2, _1, n, ...) n | |
122 | #define NARG(...) NARG_(__VA_ARGS__, 2, 1, :) | |
123 | ||
124 | static inline void *kmap_atomic(struct page *page) | |
125 | { | |
126 | return __kmap_atomic(page); | |
127 | } | |
128 | ||
129 | static inline void __deprecated *kmap_atomic_deprecated(struct page *page, | |
130 | enum km_type km) | |
131 | { | |
132 | return __kmap_atomic(page); | |
133 | } | |
134 | ||
135 | #define kmap_atomic1(...) kmap_atomic(__VA_ARGS__) | |
136 | #define kmap_atomic2(...) kmap_atomic_deprecated(__VA_ARGS__) | |
137 | #define kmap_atomic(...) PASTE2(kmap_atomic, NARG(__VA_ARGS__)(__VA_ARGS__)) | |
138 | ||
139 | static inline void __deprecated __kunmap_atomic_deprecated(void *addr, | |
140 | enum km_type km) | |
141 | { | |
142 | __kunmap_atomic(addr); | |
143 | } | |
3e4d3af5 PZ |
144 | |
145 | /* | |
146 | * Prevent people trying to call kunmap_atomic() as if it were kunmap() | |
147 | * kunmap_atomic() should get the return value of kmap_atomic, not the page. | |
148 | */ | |
980c19e3 CW |
149 | #define kunmap_atomic_deprecated(addr, km) \ |
150 | do { \ | |
151 | BUILD_BUG_ON(__same_type((addr), struct page *)); \ | |
152 | __kunmap_atomic_deprecated(addr, km); \ | |
3e4d3af5 | 153 | } while (0) |
597781f3 | 154 | |
980c19e3 CW |
155 | #define kunmap_atomic_withcheck(addr) \ |
156 | do { \ | |
157 | BUILD_BUG_ON(__same_type((addr), struct page *)); \ | |
158 | __kunmap_atomic(addr); \ | |
159 | } while (0) | |
160 | ||
161 | #define kunmap_atomic1(...) kunmap_atomic_withcheck(__VA_ARGS__) | |
162 | #define kunmap_atomic2(...) kunmap_atomic_deprecated(__VA_ARGS__) | |
163 | #define kunmap_atomic(...) PASTE2(kunmap_atomic, NARG(__VA_ARGS__)(__VA_ARGS__)) | |
164 | /**** End of C pre-processor tricks for deprecated macros ****/ | |
165 | ||
1da177e4 | 166 | /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ |
487ff320 | 167 | #ifndef clear_user_highpage |
1da177e4 LT |
168 | static inline void clear_user_highpage(struct page *page, unsigned long vaddr) |
169 | { | |
170 | void *addr = kmap_atomic(page, KM_USER0); | |
171 | clear_user_page(addr, vaddr, page); | |
172 | kunmap_atomic(addr, KM_USER0); | |
1da177e4 | 173 | } |
487ff320 | 174 | #endif |
1da177e4 LT |
175 | |
176 | #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE | |
769848c0 MG |
177 | /** |
178 | * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags | |
179 | * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE | |
180 | * @vma: The VMA the page is to be allocated for | |
181 | * @vaddr: The virtual address the page will be inserted into | |
182 | * | |
183 | * This function will allocate a page for a VMA but the caller is expected | |
184 | * to specify via movableflags whether the page will be movable in the | |
185 | * future or not | |
186 | * | |
187 | * An architecture may override this function by defining | |
188 | * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own | |
189 | * implementation. | |
190 | */ | |
1da177e4 | 191 | static inline struct page * |
769848c0 MG |
192 | __alloc_zeroed_user_highpage(gfp_t movableflags, |
193 | struct vm_area_struct *vma, | |
194 | unsigned long vaddr) | |
1da177e4 | 195 | { |
769848c0 MG |
196 | struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags, |
197 | vma, vaddr); | |
1da177e4 LT |
198 | |
199 | if (page) | |
200 | clear_user_highpage(page, vaddr); | |
201 | ||
202 | return page; | |
203 | } | |
204 | #endif | |
205 | ||
769848c0 MG |
206 | /** |
207 | * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move | |
208 | * @vma: The VMA the page is to be allocated for | |
209 | * @vaddr: The virtual address the page will be inserted into | |
210 | * | |
211 | * This function will allocate a page for a VMA that the caller knows will | |
212 | * be able to migrate in the future using move_pages() or reclaimed | |
213 | */ | |
214 | static inline struct page * | |
215 | alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, | |
216 | unsigned long vaddr) | |
217 | { | |
218 | return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); | |
219 | } | |
220 | ||
1da177e4 LT |
221 | static inline void clear_highpage(struct page *page) |
222 | { | |
223 | void *kaddr = kmap_atomic(page, KM_USER0); | |
224 | clear_page(kaddr); | |
225 | kunmap_atomic(kaddr, KM_USER0); | |
226 | } | |
227 | ||
eebd2aa3 CL |
228 | static inline void zero_user_segments(struct page *page, |
229 | unsigned start1, unsigned end1, | |
230 | unsigned start2, unsigned end2) | |
231 | { | |
232 | void *kaddr = kmap_atomic(page, KM_USER0); | |
233 | ||
234 | BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE); | |
235 | ||
236 | if (end1 > start1) | |
237 | memset(kaddr + start1, 0, end1 - start1); | |
238 | ||
239 | if (end2 > start2) | |
240 | memset(kaddr + start2, 0, end2 - start2); | |
241 | ||
242 | kunmap_atomic(kaddr, KM_USER0); | |
243 | flush_dcache_page(page); | |
244 | } | |
245 | ||
246 | static inline void zero_user_segment(struct page *page, | |
247 | unsigned start, unsigned end) | |
248 | { | |
249 | zero_user_segments(page, start, end, 0, 0); | |
250 | } | |
251 | ||
252 | static inline void zero_user(struct page *page, | |
253 | unsigned start, unsigned size) | |
254 | { | |
255 | zero_user_segments(page, start, start + size, 0, 0); | |
256 | } | |
01f2705d | 257 | |
f37bc271 | 258 | static inline void __deprecated memclear_highpage_flush(struct page *page, |
01f2705d | 259 | unsigned int offset, unsigned int size) |
1da177e4 | 260 | { |
eebd2aa3 | 261 | zero_user(page, offset, size); |
1da177e4 LT |
262 | } |
263 | ||
77fff4ae AN |
264 | #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE |
265 | ||
9de455b2 AN |
266 | static inline void copy_user_highpage(struct page *to, struct page *from, |
267 | unsigned long vaddr, struct vm_area_struct *vma) | |
1da177e4 LT |
268 | { |
269 | char *vfrom, *vto; | |
270 | ||
271 | vfrom = kmap_atomic(from, KM_USER0); | |
272 | vto = kmap_atomic(to, KM_USER1); | |
273 | copy_user_page(vto, vfrom, vaddr, to); | |
1da177e4 | 274 | kunmap_atomic(vto, KM_USER1); |
61ecdb80 | 275 | kunmap_atomic(vfrom, KM_USER0); |
1da177e4 LT |
276 | } |
277 | ||
77fff4ae AN |
278 | #endif |
279 | ||
1da177e4 LT |
280 | static inline void copy_highpage(struct page *to, struct page *from) |
281 | { | |
282 | char *vfrom, *vto; | |
283 | ||
284 | vfrom = kmap_atomic(from, KM_USER0); | |
285 | vto = kmap_atomic(to, KM_USER1); | |
286 | copy_page(vto, vfrom); | |
1da177e4 | 287 | kunmap_atomic(vto, KM_USER1); |
61ecdb80 | 288 | kunmap_atomic(vfrom, KM_USER0); |
1da177e4 LT |
289 | } |
290 | ||
291 | #endif /* _LINUX_HIGHMEM_H */ |