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 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 #define VM_DONTSWAP 0x2000
79
80
81 #define VM_STACK_FLAGS 0x0177
82
83
84
85
86
87 extern pgprot_t protection_map[16];
88
89
90
91
92
93
94
95 struct vm_operations_struct {
96 void (*open)(struct vm_area_struct * area);
97 void (*close)(struct vm_area_struct * area);
98 void (*unmap)(struct vm_area_struct *area, unsigned long, size_t);
99 void (*protect)(struct vm_area_struct *area, unsigned long, size_t, unsigned int newprot);
100 int (*sync)(struct vm_area_struct *area, unsigned long, size_t, unsigned int flags);
101 void (*advise)(struct vm_area_struct *area, unsigned long, size_t, unsigned int advise);
102 unsigned long (*nopage)(struct vm_area_struct * area, unsigned long address,
103 unsigned long page, int write_access);
104 unsigned long (*wppage)(struct vm_area_struct * area, unsigned long address,
105 unsigned long page);
106 int (*swapout)(struct vm_area_struct *, unsigned long, pte_t *);
107 pte_t (*swapin)(struct vm_area_struct *, unsigned long, unsigned long);
108 };
109
110 extern mem_map_t * mem_map;
111 extern unsigned char *age_map;
112
113
114 #define P_DIRTY 0x0001
115 #define P_LOCKED 0x0002
116 #define P_UPTODATE 0x0004
117 #define P_RESERVED 0x8000
118
119 struct page_info {
120 unsigned short flags;
121 unsigned short count;
122 struct inode * inode;
123 unsigned long offset;
124 struct page_info * next_same_inode;
125 struct page_info * prev_same_inode;
126 struct page_info * next_hash;
127 struct page_info * prev_hash;
128 struct wait_queue *wait;
129 };
130
131
132
133
134
135
136 extern int nr_swap_pages;
137 extern int nr_free_pages;
138 extern int min_free_pages;
139
140 #define NR_MEM_LISTS 6
141
142 struct mem_list {
143 struct mem_list * next;
144 struct mem_list * prev;
145 };
146
147 extern struct mem_list free_area_list[NR_MEM_LISTS];
148 extern unsigned char * free_area_map[NR_MEM_LISTS];
149
150
151
152
153
154
155 #define __get_free_page(priority) __get_free_pages((priority),0,~0UL)
156 #define __get_dma_pages(priority, order) __get_free_pages((priority),(order),MAX_DMA_ADDRESS)
157 extern unsigned long __get_free_pages(int priority, unsigned long gfporder, unsigned long max_addr);
158
159 extern inline unsigned long get_free_page(int priority)
160 {
161 unsigned long page;
162
163 page = __get_free_page(priority);
164 if (page)
165 memset((void *) page, 0, PAGE_SIZE);
166 return page;
167 }
168
169
170
171 #define free_page(addr) free_pages((addr),0)
172 extern void free_pages(unsigned long addr, unsigned long order);
173
174 extern void show_free_areas(void);
175 extern unsigned long put_dirty_page(struct task_struct * tsk,unsigned long page,
176 unsigned long address);
177
178 extern void free_page_tables(struct task_struct * tsk);
179 extern void clear_page_tables(struct task_struct * tsk);
180 extern int new_page_tables(struct task_struct * tsk);
181 extern int copy_page_tables(struct task_struct * to);
182 extern int clone_page_tables(struct task_struct * to);
183 extern int unmap_page_range(unsigned long from, unsigned long size);
184 extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, pgprot_t prot);
185 extern int zeromap_page_range(unsigned long from, unsigned long size, pgprot_t prot);
186 extern int copy_page_range(struct mm_struct *dst, struct mm_struct *src, struct vm_area_struct *vma);
187 extern int zap_page_range(struct mm_struct *mm, unsigned long address, unsigned long size);
188
189 extern void vmtruncate(struct inode * inode, unsigned long offset);
190 extern void handle_mm_fault(struct vm_area_struct *vma, unsigned long address, int write_access);
191 extern void do_wp_page(struct task_struct * tsk, struct vm_area_struct * vma, unsigned long address, int write_access);
192 extern void do_no_page(struct task_struct * tsk, struct vm_area_struct * vma, unsigned long address, int write_access);
193
194 extern unsigned long paging_init(unsigned long start_mem, unsigned long end_mem);
195 extern void mem_init(unsigned long start_mem, unsigned long end_mem);
196 extern void show_mem(void);
197 extern void oom(struct task_struct * tsk);
198 extern void si_meminfo(struct sysinfo * val);
199
200
201
202 extern void * vmalloc(unsigned long size);
203 extern void * vremap(unsigned long offset, unsigned long size);
204 extern void vfree(void * addr);
205 extern int vread(char *buf, char *addr, int count);
206
207
208
209 extern void swap_free(unsigned long);
210 extern void swap_duplicate(unsigned long);
211 extern void swap_in(struct task_struct *, struct vm_area_struct *, pte_t *, unsigned long id, int write_access);
212
213 extern void si_swapinfo(struct sysinfo * val);
214 extern void rw_swap_page(int rw, unsigned long nr, char * buf);
215
216
217 extern unsigned long do_mmap(struct file * file, unsigned long addr, unsigned long len,
218 unsigned long prot, unsigned long flags, unsigned long off);
219 extern struct vm_area_struct * find_vma (struct task_struct *, unsigned long);
220 extern struct vm_area_struct * find_vma_intersection (struct task_struct *, unsigned long, unsigned long);
221 extern void merge_segments(struct task_struct *, unsigned long, unsigned long);
222 extern void insert_vm_struct(struct task_struct *, struct vm_area_struct *);
223 extern void remove_shared_vm_struct(struct vm_area_struct *);
224 extern void build_mmap_avl(struct mm_struct *);
225 extern void exit_mmap(struct mm_struct *);
226 extern int do_munmap(unsigned long, size_t);
227 extern unsigned long get_unmapped_area(unsigned long, unsigned long);
228
229 #define read_swap_page(nr,buf) \
230 rw_swap_page(READ,(nr),(buf))
231 #define write_swap_page(nr,buf) \
232 rw_swap_page(WRITE,(nr),(buf))
233
234 #define GFP_BUFFER 0x00
235 #define GFP_ATOMIC 0x01
236 #define GFP_USER 0x02
237 #define GFP_KERNEL 0x03
238 #define GFP_NOBUFFER 0x04
239 #define GFP_NFS 0x05
240
241
242
243
244 #define GFP_DMA 0x80
245
246 #define GFP_LEVEL_MASK 0xf
247
248
249
250
251
252
253
254 #define SHM_SWP_TYPE 0x40
255
256 extern void shm_no_page (ulong *);
257
258
259
260
261 #define SWAP_CACHE_INFO
262
263 extern unsigned long * swap_cache;
264
265 #ifdef SWAP_CACHE_INFO
266 extern unsigned long swap_cache_add_total;
267 extern unsigned long swap_cache_add_success;
268 extern unsigned long swap_cache_del_total;
269 extern unsigned long swap_cache_del_success;
270 extern unsigned long swap_cache_find_total;
271 extern unsigned long swap_cache_find_success;
272 #endif
273
274 extern inline unsigned long in_swap_cache(unsigned long addr)
275 {
276 return swap_cache[MAP_NR(addr)];
277 }
278
279 extern inline long find_in_swap_cache (unsigned long addr)
280 {
281 unsigned long entry;
282
283 #ifdef SWAP_CACHE_INFO
284 swap_cache_find_total++;
285 #endif
286 entry = xchg(swap_cache + MAP_NR(addr), 0);
287 #ifdef SWAP_CACHE_INFO
288 if (entry)
289 swap_cache_find_success++;
290 #endif
291 return entry;
292 }
293
294 extern inline int delete_from_swap_cache(unsigned long addr)
295 {
296 unsigned long entry;
297
298 #ifdef SWAP_CACHE_INFO
299 swap_cache_del_total++;
300 #endif
301 entry= xchg(swap_cache + MAP_NR(addr), 0);
302 if (entry) {
303 #ifdef SWAP_CACHE_INFO
304 swap_cache_del_success++;
305 #endif
306 swap_free(entry);
307 return 1;
308 }
309 return 0;
310 }
311
312 #endif
313
314 #endif