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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29
30
31
32
33
34
35 struct vm_area_struct {
36 struct task_struct * vm_task;
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 void (*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 void (*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)
153 extern unsigned long __get_free_pages(int priority, unsigned long gfporder);
154 extern unsigned long __get_dma_pages(int priority, unsigned long gfporder);
155 extern inline unsigned long get_free_page(int priority)
156 {
157 unsigned long page;
158
159 page = __get_free_page(priority);
160 if (page)
161 memset((void *) page, 0, PAGE_SIZE);
162 return page;
163 }
164
165
166
167 #define free_page(addr) free_pages((addr),0)
168 extern void free_pages(unsigned long addr, unsigned long order);
169
170 extern void show_free_areas(void);
171 extern unsigned long put_dirty_page(struct task_struct * tsk,unsigned long page,
172 unsigned long address);
173
174 extern void free_page_tables(struct task_struct * tsk);
175 extern void clear_page_tables(struct task_struct * tsk);
176 extern int copy_page_tables(struct task_struct * to);
177 extern int clone_page_tables(struct task_struct * to);
178 extern int unmap_page_range(unsigned long from, unsigned long size);
179 extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, pgprot_t prot);
180 extern int zeromap_page_range(unsigned long from, unsigned long size, pgprot_t prot);
181
182 extern void handle_mm_fault(struct vm_area_struct *vma, unsigned long address, int write_access);
183 extern void do_wp_page(struct vm_area_struct * vma, unsigned long address, int write_access);
184 extern void do_no_page(struct vm_area_struct * vma, unsigned long address, int write_access);
185
186 extern unsigned long paging_init(unsigned long start_mem, unsigned long end_mem);
187 extern void mem_init(unsigned long start_mem, unsigned long end_mem);
188 extern void show_mem(void);
189 extern void oom(struct task_struct * tsk);
190 extern void si_meminfo(struct sysinfo * val);
191
192
193
194 extern void * vmalloc(unsigned long size);
195 extern void vfree(void * addr);
196 extern int vread(char *buf, char *addr, int count);
197
198
199
200 extern void swap_free(unsigned long);
201 extern void swap_duplicate(unsigned long);
202 extern void swap_in(struct vm_area_struct *, pte_t *, unsigned long id, int write_access);
203
204 extern void si_swapinfo(struct sysinfo * val);
205 extern void rw_swap_page(int rw, unsigned long nr, char * buf);
206
207
208 extern unsigned long do_mmap(struct file * file, unsigned long addr, unsigned long len,
209 unsigned long prot, unsigned long flags, unsigned long off);
210 extern struct vm_area_struct * find_vma (struct task_struct *, unsigned long);
211 extern struct vm_area_struct * find_vma_intersection (struct task_struct *, unsigned long, unsigned long);
212 extern void merge_segments(struct task_struct *, unsigned long, unsigned long);
213 extern void insert_vm_struct(struct task_struct *, struct vm_area_struct *);
214 extern void remove_shared_vm_struct(struct vm_area_struct *);
215 extern void build_mmap_avl(struct task_struct *);
216 extern void exit_mmap(struct task_struct *);
217 extern int do_munmap(unsigned long, size_t);
218 extern unsigned long get_unmapped_area(unsigned long);
219
220 #define read_swap_page(nr,buf) \
221 rw_swap_page(READ,(nr),(buf))
222 #define write_swap_page(nr,buf) \
223 rw_swap_page(WRITE,(nr),(buf))
224
225 #define GFP_BUFFER 0x00
226 #define GFP_ATOMIC 0x01
227 #define GFP_USER 0x02
228 #define GFP_KERNEL 0x03
229 #define GFP_NOBUFFER 0x04
230 #define GFP_NFS 0x05
231
232
233
234
235 #define GFP_DMA 0x80
236
237
238
239
240
241
242 #define SHM_SWP_TYPE 0x41
243 extern void shm_no_page (ulong *);
244
245
246
247
248 #define SWAP_CACHE_INFO
249
250 extern unsigned long * swap_cache;
251
252 #ifdef SWAP_CACHE_INFO
253 extern unsigned long swap_cache_add_total;
254 extern unsigned long swap_cache_add_success;
255 extern unsigned long swap_cache_del_total;
256 extern unsigned long swap_cache_del_success;
257 extern unsigned long swap_cache_find_total;
258 extern unsigned long swap_cache_find_success;
259 #endif
260
261 extern inline unsigned long in_swap_cache(unsigned long addr)
262 {
263 return swap_cache[MAP_NR(addr)];
264 }
265
266 extern inline long find_in_swap_cache (unsigned long addr)
267 {
268 unsigned long entry;
269
270 #ifdef SWAP_CACHE_INFO
271 swap_cache_find_total++;
272 #endif
273 entry = (unsigned long) xchg_ptr(swap_cache + MAP_NR(addr), NULL);
274 #ifdef SWAP_CACHE_INFO
275 if (entry)
276 swap_cache_find_success++;
277 #endif
278 return entry;
279 }
280
281 extern inline int delete_from_swap_cache(unsigned long addr)
282 {
283 unsigned long entry;
284
285 #ifdef SWAP_CACHE_INFO
286 swap_cache_del_total++;
287 #endif
288 entry= (unsigned long) xchg_ptr(swap_cache + MAP_NR(addr), NULL);
289 if (entry) {
290 #ifdef SWAP_CACHE_INFO
291 swap_cache_del_success++;
292 #endif
293 swap_free(entry);
294 return 1;
295 }
296 return 0;
297 }
298
299 #endif
300
301 #endif