This source file includes following definitions.
- get_free_page
- in_swap_cache
- find_in_swap_cache
- delete_from_swap_cache
1 #ifndef _LINUX_MM_H
2 #define _LINUX_MM_H
3
4 #include <linux/sched.h>
5 #include <linux/errno.h>
6 #include <linux/kernel.h>
7 #include <linux/string.h>
8
9 extern unsigned long high_memory;
10
11 #include <asm/page.h>
12
13 #ifdef __KERNEL__
14
15 #define VERIFY_READ 0
16 #define VERIFY_WRITE 1
17
18 extern int verify_area(int, const void *, unsigned long);
19
20
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22
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27
28
29
30
31
32
33
34
35 struct vm_area_struct {
36 struct mm_struct * vm_mm;
37 unsigned long vm_start;
38 unsigned long vm_end;
39 pgprot_t vm_page_prot;
40 unsigned short vm_flags;
41
42 short vm_avl_height;
43 struct vm_area_struct * vm_avl_left;
44 struct vm_area_struct * vm_avl_right;
45
46 struct vm_area_struct * vm_next;
47
48
49
50 struct vm_area_struct * vm_next_share;
51 struct vm_area_struct * vm_prev_share;
52
53 struct vm_operations_struct * vm_ops;
54 unsigned long vm_offset;
55 struct inode * vm_inode;
56 unsigned long vm_pte;
57 };
58
59
60
61
62 #define VM_READ 0x0001
63 #define VM_WRITE 0x0002
64 #define VM_EXEC 0x0004
65 #define VM_SHARED 0x0008
66
67 #define VM_MAYREAD 0x0010
68 #define VM_MAYWRITE 0x0020
69 #define VM_MAYEXEC 0x0040
70 #define VM_MAYSHARE 0x0080
71
72 #define VM_GROWSDOWN 0x0100
73 #define VM_GROWSUP 0x0200
74 #define VM_SHM 0x0400
75 #define VM_DENYWRITE 0x0800
76
77 #define VM_EXECUTABLE 0x1000
78
79 #define VM_STACK_FLAGS 0x0177
80
81
82
83
84
85 extern pgprot_t protection_map[16];
86
87
88
89
90
91
92
93 struct vm_operations_struct {
94 void (*open)(struct vm_area_struct * area);
95 void (*close)(struct vm_area_struct * area);
96 void (*unmap)(struct vm_area_struct *area, unsigned long, size_t);
97 void (*protect)(struct vm_area_struct *area, unsigned long, size_t, unsigned int newprot);
98 int (*sync)(struct vm_area_struct *area, unsigned long, size_t, unsigned int flags);
99 void (*advise)(struct vm_area_struct *area, unsigned long, size_t, unsigned int advise);
100 unsigned long (*nopage)(struct vm_area_struct * area, unsigned long address,
101 unsigned long page, int write_access);
102 unsigned long (*wppage)(struct vm_area_struct * area, unsigned long address,
103 unsigned long page);
104 int (*swapout)(struct vm_area_struct *, unsigned long, pte_t *);
105 pte_t (*swapin)(struct vm_area_struct *, unsigned long, unsigned long);
106 };
107
108 extern mem_map_t * mem_map;
109
110
111 #define P_DIRTY 0x0001
112 #define P_LOCKED 0x0002
113 #define P_UPTODATE 0x0004
114 #define P_RESERVED 0x8000
115
116 struct page_info {
117 unsigned short flags;
118 unsigned short count;
119 struct inode * inode;
120 unsigned long offset;
121 struct page_info * next_same_inode;
122 struct page_info * prev_same_inode;
123 struct page_info * next_hash;
124 struct page_info * prev_hash;
125 struct wait_queue *wait;
126 };
127
128
129
130
131
132
133 extern int nr_swap_pages;
134 extern int nr_free_pages;
135 extern int min_free_pages;
136
137 #define NR_MEM_LISTS 6
138
139 struct mem_list {
140 struct mem_list * next;
141 struct mem_list * prev;
142 };
143
144 extern struct mem_list free_area_list[NR_MEM_LISTS];
145 extern unsigned char * free_area_map[NR_MEM_LISTS];
146
147
148
149
150
151
152 #define __get_free_page(priority) __get_free_pages((priority),0,~0UL)
153 #define __get_dma_pages(priority, order) __get_free_pages((priority),(order),MAX_DMA_ADDRESS)
154 extern unsigned long __get_free_pages(int priority, unsigned long gfporder, unsigned long max_addr);
155
156 extern inline unsigned long get_free_page(int priority)
157 {
158 unsigned long page;
159
160 page = __get_free_page(priority);
161 if (page)
162 memset((void *) page, 0, PAGE_SIZE);
163 return page;
164 }
165
166
167
168 #define free_page(addr) free_pages((addr),0)
169 extern void free_pages(unsigned long addr, unsigned long order);
170
171 extern void show_free_areas(void);
172 extern unsigned long put_dirty_page(struct task_struct * tsk,unsigned long page,
173 unsigned long address);
174
175 extern void free_page_tables(struct task_struct * tsk);
176 extern void clear_page_tables(struct task_struct * tsk);
177 extern int new_page_tables(struct task_struct * tsk);
178 extern int copy_page_tables(struct task_struct * to);
179 extern int clone_page_tables(struct task_struct * to);
180 extern int unmap_page_range(unsigned long from, unsigned long size);
181 extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, pgprot_t prot);
182 extern int zeromap_page_range(unsigned long from, unsigned long size, pgprot_t prot);
183 extern int copy_page_range(struct mm_struct *dst, struct mm_struct *src, struct vm_area_struct *vma);
184 extern int zap_page_range(struct mm_struct *mm, unsigned long address, unsigned long size);
185
186 extern void handle_mm_fault(struct vm_area_struct *vma, unsigned long address, int write_access);
187 extern void do_wp_page(struct task_struct * tsk, struct vm_area_struct * vma, unsigned long address, int write_access);
188 extern void do_no_page(struct task_struct * tsk, struct vm_area_struct * vma, unsigned long address, int write_access);
189
190 extern unsigned long paging_init(unsigned long start_mem, unsigned long end_mem);
191 extern void mem_init(unsigned long start_mem, unsigned long end_mem);
192 extern void show_mem(void);
193 extern void oom(struct task_struct * tsk);
194 extern void si_meminfo(struct sysinfo * val);
195
196
197
198 extern void * vmalloc(unsigned long size);
199 extern void * vremap(unsigned long offset, unsigned long size);
200 extern void vfree(void * addr);
201 extern int vread(char *buf, char *addr, int count);
202
203
204
205 extern void swap_free(unsigned long);
206 extern void swap_duplicate(unsigned long);
207 extern void swap_in(struct task_struct *, struct vm_area_struct *, pte_t *, unsigned long id, int write_access);
208
209 extern void si_swapinfo(struct sysinfo * val);
210 extern void rw_swap_page(int rw, unsigned long nr, char * buf);
211
212
213 extern unsigned long do_mmap(struct file * file, unsigned long addr, unsigned long len,
214 unsigned long prot, unsigned long flags, unsigned long off);
215 extern struct vm_area_struct * find_vma (struct task_struct *, unsigned long);
216 extern struct vm_area_struct * find_vma_intersection (struct task_struct *, unsigned long, unsigned long);
217 extern void merge_segments(struct task_struct *, unsigned long, unsigned long);
218 extern void insert_vm_struct(struct task_struct *, struct vm_area_struct *);
219 extern void remove_shared_vm_struct(struct vm_area_struct *);
220 extern void build_mmap_avl(struct mm_struct *);
221 extern void exit_mmap(struct mm_struct *);
222 extern int do_munmap(unsigned long, size_t);
223 extern unsigned long get_unmapped_area(unsigned long, unsigned long);
224
225 #define read_swap_page(nr,buf) \
226 rw_swap_page(READ,(nr),(buf))
227 #define write_swap_page(nr,buf) \
228 rw_swap_page(WRITE,(nr),(buf))
229
230 #define GFP_BUFFER 0x00
231 #define GFP_ATOMIC 0x01
232 #define GFP_USER 0x02
233 #define GFP_KERNEL 0x03
234 #define GFP_NOBUFFER 0x04
235 #define GFP_NFS 0x05
236
237
238
239
240 #define GFP_DMA 0x80
241
242 #define GFP_LEVEL_MASK 0xf
243
244
245
246
247
248
249
250 #define SHM_SWP_TYPE 0x40
251
252 extern void shm_no_page (ulong *);
253
254
255
256
257 #define SWAP_CACHE_INFO
258
259 extern unsigned long * swap_cache;
260
261 #ifdef SWAP_CACHE_INFO
262 extern unsigned long swap_cache_add_total;
263 extern unsigned long swap_cache_add_success;
264 extern unsigned long swap_cache_del_total;
265 extern unsigned long swap_cache_del_success;
266 extern unsigned long swap_cache_find_total;
267 extern unsigned long swap_cache_find_success;
268 #endif
269
270 extern inline unsigned long in_swap_cache(unsigned long addr)
271 {
272 return swap_cache[MAP_NR(addr)];
273 }
274
275 extern inline long find_in_swap_cache (unsigned long addr)
276 {
277 unsigned long entry;
278
279 #ifdef SWAP_CACHE_INFO
280 swap_cache_find_total++;
281 #endif
282 entry = xchg(swap_cache + MAP_NR(addr), 0);
283 #ifdef SWAP_CACHE_INFO
284 if (entry)
285 swap_cache_find_success++;
286 #endif
287 return entry;
288 }
289
290 extern inline int delete_from_swap_cache(unsigned long addr)
291 {
292 unsigned long entry;
293
294 #ifdef SWAP_CACHE_INFO
295 swap_cache_del_total++;
296 #endif
297 entry= xchg(swap_cache + MAP_NR(addr), 0);
298 if (entry) {
299 #ifdef SWAP_CACHE_INFO
300 swap_cache_del_success++;
301 #endif
302 swap_free(entry);
303 return 1;
304 }
305 return 0;
306 }
307
308 #endif
309
310 #endif