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