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 <asm/page.h>
5
6 #include <linux/sched.h>
7 #include <linux/errno.h>
8 #include <linux/kernel.h>
9 #include <linux/string.h>
10
11 #define VERIFY_READ 0
12 #define VERIFY_WRITE 1
13
14 extern int verify_area(int, const void *, unsigned long);
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31 struct vm_area_struct {
32 struct task_struct * vm_task;
33 unsigned long vm_start;
34 unsigned long vm_end;
35 unsigned short vm_page_prot;
36 unsigned short vm_flags;
37
38 struct vm_area_struct * vm_next;
39
40
41
42 struct vm_area_struct * vm_next_share;
43 struct vm_area_struct * vm_prev_share;
44
45 struct vm_operations_struct * vm_ops;
46 unsigned long vm_offset;
47 struct inode * vm_inode;
48 unsigned long vm_pte;
49 };
50
51
52
53
54 #define VM_READ 0x0001
55 #define VM_WRITE 0x0002
56 #define VM_EXEC 0x0004
57 #define VM_SHARED 0x0008
58
59 #define VM_MAYREAD 0x0010
60 #define VM_MAYWRITE 0x0020
61 #define VM_MAYEXEC 0x0040
62 #define VM_MAYSHARE 0x0080
63
64 #define VM_GROWSDOWN 0x0100
65 #define VM_GROWSUP 0x0200
66 #define VM_SHM 0x0400
67 #define VM_DENYWRITE 0x0800
68
69 #define VM_EXECUTABLE 0x1000
70
71 #define VM_STACK_FLAGS 0x0177
72
73
74
75
76
77
78 struct vm_operations_struct {
79 void (*open)(struct vm_area_struct * area);
80 void (*close)(struct vm_area_struct * area);
81 void (*unmap)(struct vm_area_struct *area, unsigned long, size_t);
82 void (*protect)(struct vm_area_struct *area, unsigned long, size_t, unsigned int newprot);
83 void (*sync)(struct vm_area_struct *area, unsigned long, size_t, unsigned int flags);
84 void (*advise)(struct vm_area_struct *area, unsigned long, size_t, unsigned int advise);
85 unsigned long (*nopage)(struct vm_area_struct * area, unsigned long address,
86 unsigned long page, int error_code);
87 unsigned long (*wppage)(struct vm_area_struct * area, unsigned long address,
88 unsigned long page);
89 void (*swapout)(struct vm_area_struct *, unsigned long, unsigned long *);
90 unsigned long (*swapin)(struct vm_area_struct *, unsigned long);
91 };
92
93 extern unsigned long __bad_page(void);
94 extern unsigned long __bad_pagetable(void);
95 extern unsigned long __zero_page(void);
96
97 #define BAD_PAGETABLE __bad_pagetable()
98 #define BAD_PAGE __bad_page()
99 #define ZERO_PAGE __zero_page()
100
101
102 #define P_DIRTY 0x0001
103 #define P_LOCKED 0x0002
104 #define P_UPTODATE 0x0004
105 #define P_RESERVED 0x8000
106
107 struct page_info {
108 unsigned short flags;
109 unsigned short count;
110 struct inode * inode;
111 unsigned long offset;
112 struct page_info * next_same_inode;
113 struct page_info * prev_same_inode;
114 struct page_info * next_hash;
115 struct page_info * prev_hash;
116 struct wait_queue *wait;
117 };
118
119
120 #ifdef __KERNEL__
121
122
123
124
125
126 extern int nr_swap_pages;
127 extern int nr_free_pages;
128 extern int min_free_pages;
129
130 #define NR_MEM_LISTS 6
131
132 struct mem_list {
133 struct mem_list * next;
134 struct mem_list * prev;
135 };
136
137 extern struct mem_list free_area_list[NR_MEM_LISTS];
138 extern unsigned char * free_area_map[NR_MEM_LISTS];
139
140
141
142
143
144
145 #define __get_free_page(priority) __get_free_pages((priority),0)
146 extern unsigned long __get_free_pages(int priority, unsigned long gfporder);
147 extern unsigned long __get_dma_pages(int priority, unsigned long gfporder);
148 extern inline unsigned long get_free_page(int priority)
149 {
150 unsigned long page;
151
152 page = __get_free_page(priority);
153 if (page)
154 memset((void *) page, 0, PAGE_SIZE);
155 return page;
156 }
157
158
159
160 #define free_page(addr) free_pages((addr),0)
161 extern void free_pages(unsigned long addr, unsigned long order);
162
163 extern void show_free_areas(void);
164 extern unsigned long put_dirty_page(struct task_struct * tsk,unsigned long page,
165 unsigned long address);
166
167 extern void free_page_tables(struct task_struct * tsk);
168 extern void clear_page_tables(struct task_struct * tsk);
169 extern int copy_page_tables(struct task_struct * to);
170 extern int clone_page_tables(struct task_struct * to);
171 extern int unmap_page_range(unsigned long from, unsigned long size);
172 extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, int mask);
173 extern int zeromap_page_range(unsigned long from, unsigned long size, int mask);
174
175 extern void do_wp_page(struct vm_area_struct * vma, unsigned long address,
176 unsigned long error_code);
177 extern void do_no_page(struct vm_area_struct * vma, unsigned long address,
178 unsigned long error_code);
179
180 extern unsigned long paging_init(unsigned long start_mem, unsigned long end_mem);
181 extern void mem_init(unsigned long low_start_mem,
182 unsigned long start_mem, unsigned long end_mem);
183 extern void show_mem(void);
184 extern void oom(struct task_struct * task);
185 extern void si_meminfo(struct sysinfo * val);
186
187
188
189 extern void * vmalloc(unsigned long size);
190 extern void vfree(void * addr);
191 extern int vread(char *buf, char *addr, int count);
192
193
194
195 extern void swap_free(unsigned long page_nr);
196 extern unsigned long swap_duplicate(unsigned long page_nr);
197 extern unsigned long swap_in(unsigned long entry);
198 extern void si_swapinfo(struct sysinfo * val);
199 extern void rw_swap_page(int rw, unsigned long nr, char * buf);
200
201
202 extern int do_mmap(struct file * file, unsigned long addr, unsigned long len,
203 unsigned long prot, unsigned long flags, unsigned long off);
204 extern void merge_segments(struct vm_area_struct *);
205 extern void insert_vm_struct(struct task_struct *, struct vm_area_struct *);
206 extern void remove_shared_vm_struct(struct vm_area_struct *);
207 extern int do_munmap(unsigned long, size_t);
208 extern unsigned long get_unmapped_area(unsigned long);
209
210 #define read_swap_page(nr,buf) \
211 rw_swap_page(READ,(nr),(buf))
212 #define write_swap_page(nr,buf) \
213 rw_swap_page(WRITE,(nr),(buf))
214
215 extern unsigned long high_memory;
216
217 #define MAP_NR(addr) ((addr) >> PAGE_SHIFT)
218 #define MAP_PAGE_RESERVED (1<<15)
219
220 extern unsigned short * mem_map;
221
222 #define PAGE_PRESENT 0x001
223 #define PAGE_RW 0x002
224 #define PAGE_USER 0x004
225 #define PAGE_PWT 0x008
226 #define PAGE_PCD 0x010
227 #define PAGE_ACCESSED 0x020
228 #define PAGE_DIRTY 0x040
229 #define PAGE_COW 0x200
230
231 #define PAGE_PRIVATE (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED | PAGE_COW)
232 #define PAGE_SHARED (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED)
233 #define PAGE_COPY (PAGE_PRESENT | PAGE_USER | PAGE_ACCESSED | PAGE_COW)
234 #define PAGE_READONLY (PAGE_PRESENT | PAGE_USER | PAGE_ACCESSED)
235 #define PAGE_TABLE (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED)
236
237 #define GFP_BUFFER 0x00
238 #define GFP_ATOMIC 0x01
239 #define GFP_USER 0x02
240 #define GFP_KERNEL 0x03
241 #define GFP_NOBUFFER 0x04
242 #define GFP_NFS 0x05
243
244
245
246
247 #define GFP_DMA 0x80
248
249
250
251
252
253
254 #define SHM_SWP_TYPE 0x41
255 extern void shm_no_page (ulong *);
256
257
258
259
260 #define SWAP_CACHE_INFO
261
262 extern unsigned long * swap_cache;
263
264 #ifdef SWAP_CACHE_INFO
265 extern unsigned long swap_cache_add_total;
266 extern unsigned long swap_cache_add_success;
267 extern unsigned long swap_cache_del_total;
268 extern unsigned long swap_cache_del_success;
269 extern unsigned long swap_cache_find_total;
270 extern unsigned long swap_cache_find_success;
271 #endif
272
273 extern inline unsigned long in_swap_cache(unsigned long addr)
274 {
275 return swap_cache[addr >> PAGE_SHIFT];
276 }
277
278 extern inline long find_in_swap_cache (unsigned long addr)
279 {
280 unsigned long entry;
281
282 #ifdef SWAP_CACHE_INFO
283 swap_cache_find_total++;
284 #endif
285 __asm__ __volatile__("xchgl %0,%1"
286 :"=m" (swap_cache[addr >> PAGE_SHIFT]),
287 "=r" (entry)
288 :"0" (swap_cache[addr >> PAGE_SHIFT]),
289 "1" (0));
290 #ifdef SWAP_CACHE_INFO
291 if (entry)
292 swap_cache_find_success++;
293 #endif
294 return entry;
295 }
296
297 extern inline int delete_from_swap_cache(unsigned long addr)
298 {
299 unsigned long entry;
300
301 #ifdef SWAP_CACHE_INFO
302 swap_cache_del_total++;
303 #endif
304 __asm__ __volatile__("xchgl %0,%1"
305 :"=m" (swap_cache[addr >> PAGE_SHIFT]),
306 "=r" (entry)
307 :"0" (swap_cache[addr >> PAGE_SHIFT]),
308 "1" (0));
309 if (entry) {
310 #ifdef SWAP_CACHE_INFO
311 swap_cache_del_success++;
312 #endif
313 swap_free(entry);
314 return 1;
315 }
316 return 0;
317 }
318
319 #endif
320
321 #endif