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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> |
187f1882 | 6 | #include <linux/bug.h> |
1da177e4 | 7 | #include <linux/mm.h> |
ad76fb6b | 8 | #include <linux/uaccess.h> |
43b3a0c7 | 9 | #include <linux/hardirq.h> |
1da177e4 LT |
10 | |
11 | #include <asm/cacheflush.h> | |
12 | ||
03beb076 | 13 | #ifndef ARCH_HAS_FLUSH_ANON_PAGE |
a6f36be3 | 14 | static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr) |
03beb076 JB |
15 | { |
16 | } | |
17 | #endif | |
18 | ||
5a3a5a98 JB |
19 | #ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE |
20 | static inline void flush_kernel_dcache_page(struct page *page) | |
21 | { | |
22 | } | |
9df5f741 JB |
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 | } | |
5a3a5a98 JB |
29 | #endif |
30 | ||
3688e07f KG |
31 | #include <asm/kmap_types.h> |
32 | ||
3688e07f | 33 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
34 | #include <asm/highmem.h> |
35 | ||
36 | /* declarations for linux/mm/highmem.c */ | |
37 | unsigned int nr_free_highpages(void); | |
c1f60a5a | 38 | extern unsigned long totalhigh_pages; |
1da177e4 | 39 | |
ce6234b5 JF |
40 | void kmap_flush_unused(void); |
41 | ||
1da177e4 LT |
42 | #else /* CONFIG_HIGHMEM */ |
43 | ||
44 | static inline unsigned int nr_free_highpages(void) { return 0; } | |
45 | ||
4b529401 | 46 | #define totalhigh_pages 0UL |
c1f60a5a | 47 | |
a6ca1b99 | 48 | #ifndef ARCH_HAS_KMAP |
1da177e4 LT |
49 | static inline void *kmap(struct page *page) |
50 | { | |
51 | might_sleep(); | |
52 | return page_address(page); | |
53 | } | |
54 | ||
31c91132 MW |
55 | static inline void kunmap(struct page *page) |
56 | { | |
57 | } | |
1da177e4 | 58 | |
a24401bc | 59 | static inline void *kmap_atomic(struct page *page) |
254f9c5c GU |
60 | { |
61 | pagefault_disable(); | |
62 | return page_address(page); | |
63 | } | |
a24401bc | 64 | #define kmap_atomic_prot(page, prot) kmap_atomic(page) |
254f9c5c | 65 | |
3e4d3af5 | 66 | static inline void __kunmap_atomic(void *addr) |
4e60c86b AK |
67 | { |
68 | pagefault_enable(); | |
69 | } | |
70 | ||
3e4d3af5 | 71 | #define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn)) |
1da177e4 | 72 | #define kmap_atomic_to_page(ptr) virt_to_page(ptr) |
ce6234b5 JF |
73 | |
74 | #define kmap_flush_unused() do {} while(0) | |
a6ca1b99 | 75 | #endif |
1da177e4 LT |
76 | |
77 | #endif /* CONFIG_HIGHMEM */ | |
78 | ||
a8e23a29 PZ |
79 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32) |
80 | ||
81 | DECLARE_PER_CPU(int, __kmap_atomic_idx); | |
82 | ||
83 | static inline int kmap_atomic_idx_push(void) | |
84 | { | |
cfb82434 CL |
85 | int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1; |
86 | ||
a8e23a29 PZ |
87 | #ifdef CONFIG_DEBUG_HIGHMEM |
88 | WARN_ON_ONCE(in_irq() && !irqs_disabled()); | |
89 | BUG_ON(idx > KM_TYPE_NR); | |
90 | #endif | |
91 | return idx; | |
92 | } | |
93 | ||
20273941 PZ |
94 | static inline int kmap_atomic_idx(void) |
95 | { | |
cfb82434 | 96 | return __this_cpu_read(__kmap_atomic_idx) - 1; |
20273941 PZ |
97 | } |
98 | ||
cfb82434 | 99 | static inline void kmap_atomic_idx_pop(void) |
a8e23a29 | 100 | { |
a8e23a29 | 101 | #ifdef CONFIG_DEBUG_HIGHMEM |
cfb82434 CL |
102 | int idx = __this_cpu_dec_return(__kmap_atomic_idx); |
103 | ||
a8e23a29 | 104 | BUG_ON(idx < 0); |
cfb82434 CL |
105 | #else |
106 | __this_cpu_dec(__kmap_atomic_idx); | |
a8e23a29 | 107 | #endif |
a8e23a29 PZ |
108 | } |
109 | ||
110 | #endif | |
111 | ||
3e4d3af5 | 112 | /* |
980c19e3 CW |
113 | * NOTE: |
114 | * kmap_atomic() and kunmap_atomic() with two arguments are deprecated. | |
115 | * We only keep them for backward compatibility, any usage of them | |
116 | * are now warned. | |
3e4d3af5 | 117 | */ |
980c19e3 CW |
118 | |
119 | #define PASTE(a, b) a ## b | |
120 | #define PASTE2(a, b) PASTE(a, b) | |
121 | ||
122 | #define NARG_(_2, _1, n, ...) n | |
123 | #define NARG(...) NARG_(__VA_ARGS__, 2, 1, :) | |
124 | ||
980c19e3 CW |
125 | static inline void __deprecated *kmap_atomic_deprecated(struct page *page, |
126 | enum km_type km) | |
127 | { | |
a24401bc | 128 | return kmap_atomic(page); |
980c19e3 CW |
129 | } |
130 | ||
131 | #define kmap_atomic1(...) kmap_atomic(__VA_ARGS__) | |
132 | #define kmap_atomic2(...) kmap_atomic_deprecated(__VA_ARGS__) | |
133 | #define kmap_atomic(...) PASTE2(kmap_atomic, NARG(__VA_ARGS__)(__VA_ARGS__)) | |
134 | ||
135 | static inline void __deprecated __kunmap_atomic_deprecated(void *addr, | |
136 | enum km_type km) | |
137 | { | |
138 | __kunmap_atomic(addr); | |
139 | } | |
3e4d3af5 PZ |
140 | |
141 | /* | |
142 | * Prevent people trying to call kunmap_atomic() as if it were kunmap() | |
143 | * kunmap_atomic() should get the return value of kmap_atomic, not the page. | |
144 | */ | |
980c19e3 CW |
145 | #define kunmap_atomic_deprecated(addr, km) \ |
146 | do { \ | |
147 | BUILD_BUG_ON(__same_type((addr), struct page *)); \ | |
148 | __kunmap_atomic_deprecated(addr, km); \ | |
3e4d3af5 | 149 | } while (0) |
597781f3 | 150 | |
980c19e3 CW |
151 | #define kunmap_atomic_withcheck(addr) \ |
152 | do { \ | |
153 | BUILD_BUG_ON(__same_type((addr), struct page *)); \ | |
154 | __kunmap_atomic(addr); \ | |
155 | } while (0) | |
156 | ||
157 | #define kunmap_atomic1(...) kunmap_atomic_withcheck(__VA_ARGS__) | |
158 | #define kunmap_atomic2(...) kunmap_atomic_deprecated(__VA_ARGS__) | |
159 | #define kunmap_atomic(...) PASTE2(kunmap_atomic, NARG(__VA_ARGS__)(__VA_ARGS__)) | |
160 | /**** End of C pre-processor tricks for deprecated macros ****/ | |
161 | ||
1da177e4 | 162 | /* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */ |
487ff320 | 163 | #ifndef clear_user_highpage |
1da177e4 LT |
164 | static inline void clear_user_highpage(struct page *page, unsigned long vaddr) |
165 | { | |
1ec9c5dd | 166 | void *addr = kmap_atomic(page); |
1da177e4 | 167 | clear_user_page(addr, vaddr, page); |
1ec9c5dd | 168 | kunmap_atomic(addr); |
1da177e4 | 169 | } |
487ff320 | 170 | #endif |
1da177e4 LT |
171 | |
172 | #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE | |
769848c0 MG |
173 | /** |
174 | * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags | |
175 | * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE | |
176 | * @vma: The VMA the page is to be allocated for | |
177 | * @vaddr: The virtual address the page will be inserted into | |
178 | * | |
179 | * This function will allocate a page for a VMA but the caller is expected | |
180 | * to specify via movableflags whether the page will be movable in the | |
181 | * future or not | |
182 | * | |
183 | * An architecture may override this function by defining | |
184 | * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own | |
185 | * implementation. | |
186 | */ | |
1da177e4 | 187 | static inline struct page * |
769848c0 MG |
188 | __alloc_zeroed_user_highpage(gfp_t movableflags, |
189 | struct vm_area_struct *vma, | |
190 | unsigned long vaddr) | |
1da177e4 | 191 | { |
769848c0 MG |
192 | struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags, |
193 | vma, vaddr); | |
1da177e4 LT |
194 | |
195 | if (page) | |
196 | clear_user_highpage(page, vaddr); | |
197 | ||
198 | return page; | |
199 | } | |
200 | #endif | |
201 | ||
769848c0 MG |
202 | /** |
203 | * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move | |
204 | * @vma: The VMA the page is to be allocated for | |
205 | * @vaddr: The virtual address the page will be inserted into | |
206 | * | |
207 | * This function will allocate a page for a VMA that the caller knows will | |
208 | * be able to migrate in the future using move_pages() or reclaimed | |
209 | */ | |
210 | static inline struct page * | |
211 | alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, | |
212 | unsigned long vaddr) | |
213 | { | |
214 | return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); | |
215 | } | |
216 | ||
1da177e4 LT |
217 | static inline void clear_highpage(struct page *page) |
218 | { | |
1ec9c5dd | 219 | void *kaddr = kmap_atomic(page); |
1da177e4 | 220 | clear_page(kaddr); |
1ec9c5dd | 221 | kunmap_atomic(kaddr); |
1da177e4 LT |
222 | } |
223 | ||
eebd2aa3 CL |
224 | static inline void zero_user_segments(struct page *page, |
225 | unsigned start1, unsigned end1, | |
226 | unsigned start2, unsigned end2) | |
227 | { | |
1ec9c5dd | 228 | void *kaddr = kmap_atomic(page); |
eebd2aa3 CL |
229 | |
230 | BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE); | |
231 | ||
232 | if (end1 > start1) | |
233 | memset(kaddr + start1, 0, end1 - start1); | |
234 | ||
235 | if (end2 > start2) | |
236 | memset(kaddr + start2, 0, end2 - start2); | |
237 | ||
1ec9c5dd | 238 | kunmap_atomic(kaddr); |
eebd2aa3 CL |
239 | flush_dcache_page(page); |
240 | } | |
241 | ||
242 | static inline void zero_user_segment(struct page *page, | |
243 | unsigned start, unsigned end) | |
244 | { | |
245 | zero_user_segments(page, start, end, 0, 0); | |
246 | } | |
247 | ||
248 | static inline void zero_user(struct page *page, | |
249 | unsigned start, unsigned size) | |
250 | { | |
251 | zero_user_segments(page, start, start + size, 0, 0); | |
252 | } | |
01f2705d | 253 | |
f37bc271 | 254 | static inline void __deprecated memclear_highpage_flush(struct page *page, |
01f2705d | 255 | unsigned int offset, unsigned int size) |
1da177e4 | 256 | { |
eebd2aa3 | 257 | zero_user(page, offset, size); |
1da177e4 LT |
258 | } |
259 | ||
77fff4ae AN |
260 | #ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE |
261 | ||
9de455b2 AN |
262 | static inline void copy_user_highpage(struct page *to, struct page *from, |
263 | unsigned long vaddr, struct vm_area_struct *vma) | |
1da177e4 LT |
264 | { |
265 | char *vfrom, *vto; | |
266 | ||
1ec9c5dd CW |
267 | vfrom = kmap_atomic(from); |
268 | vto = kmap_atomic(to); | |
1da177e4 | 269 | copy_user_page(vto, vfrom, vaddr, to); |
1ec9c5dd CW |
270 | kunmap_atomic(vto); |
271 | kunmap_atomic(vfrom); | |
1da177e4 LT |
272 | } |
273 | ||
77fff4ae AN |
274 | #endif |
275 | ||
1da177e4 LT |
276 | static inline void copy_highpage(struct page *to, struct page *from) |
277 | { | |
278 | char *vfrom, *vto; | |
279 | ||
1ec9c5dd CW |
280 | vfrom = kmap_atomic(from); |
281 | vto = kmap_atomic(to); | |
1da177e4 | 282 | copy_page(vto, vfrom); |
1ec9c5dd CW |
283 | kunmap_atomic(vto); |
284 | kunmap_atomic(vfrom); | |
1da177e4 LT |
285 | } |
286 | ||
287 | #endif /* _LINUX_HIGHMEM_H */ |