This source file includes following definitions.
- get_free_page
1 #ifndef _LINUX_MM_H
2 #define _LINUX_MM_H
3
4 #include <linux/page.h>
5 #include <linux/sched.h>
6 #include <linux/errno.h>
7 #include <linux/kernel.h>
8
9 #define VERIFY_READ 0
10 #define VERIFY_WRITE 1
11
12 extern int verify_area(int, const void *, unsigned long);
13
14
15
16
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24
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27
28
29 struct vm_area_struct {
30 struct task_struct * vm_task;
31 unsigned long vm_start;
32 unsigned long vm_end;
33 unsigned short vm_page_prot;
34 unsigned short vm_flags;
35 struct vm_area_struct * vm_next;
36 struct vm_area_struct * vm_share;
37 struct inode * vm_inode;
38 unsigned long vm_offset;
39 struct vm_operations_struct * vm_ops;
40 };
41
42
43
44
45 #define VM_GROWSDOWN 0x01
46 #define VM_GROWSUP 0x02
47 #define VM_SHM 0x04
48
49
50
51
52
53
54
55 struct vm_operations_struct {
56 void (*open)(struct vm_area_struct * area);
57 void (*close)(struct vm_area_struct * area);
58 void (*nopage)(int error_code,
59 struct vm_area_struct * area, unsigned long address);
60 void (*wppage)(struct vm_area_struct * area, unsigned long address);
61 int (*share)(struct vm_area_struct * from, struct vm_area_struct * to, unsigned long address);
62 int (*unmap)(struct vm_area_struct *area, unsigned long, size_t);
63 };
64
65 extern unsigned long __bad_page(void);
66 extern unsigned long __bad_pagetable(void);
67 extern unsigned long __zero_page(void);
68
69 #define BAD_PAGETABLE __bad_pagetable()
70 #define BAD_PAGE __bad_page()
71 #define ZERO_PAGE __zero_page()
72
73
74 #define P_DIRTY 0x0001
75 #define P_LOCKED 0x0002
76 #define P_UPTODATE 0x0004
77 #define P_RESERVED 0x8000
78
79 struct page_info {
80 unsigned short flags;
81 unsigned short count;
82 struct inode * inode;
83 unsigned long offset;
84 struct page_info * next_same_inode;
85 struct page_info * prev_same_inode;
86 struct page_info * next_hash;
87 struct page_info * prev_hash;
88 struct wait_queue *wait;
89 };
90
91
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94
95
96 extern int nr_swap_pages;
97 extern int nr_free_pages;
98
99 #define MAX_SECONDARY_PAGES 20
100 #define NR_MEM_LISTS 6
101
102 struct mem_list {
103 struct mem_list * next;
104 struct mem_list * prev;
105 };
106
107 extern struct mem_list free_area_list[NR_MEM_LISTS];
108 extern unsigned char * free_area_map[NR_MEM_LISTS];
109
110
111
112
113
114
115 #define __get_free_page(priority) __get_free_pages((priority),0)
116 extern unsigned long __get_free_pages(int priority, unsigned long gfporder);
117 extern inline unsigned long get_free_page(int priority)
118 {
119 unsigned long page;
120
121 page = __get_free_page(priority);
122 if (page)
123 __asm__ __volatile__("rep ; stosl"
124 : \
125 :"a" (0),"c" (1024),"D" (page)
126 :"di","cx");
127 return page;
128 }
129
130
131
132 #define free_page(addr) free_pages((addr),0)
133 extern void free_pages(unsigned long addr, unsigned long order);
134
135 extern void show_free_areas(void);
136 extern unsigned long put_dirty_page(struct task_struct * tsk,unsigned long page,
137 unsigned long address);
138 extern void free_page_tables(struct task_struct * tsk);
139 extern void clear_page_tables(struct task_struct * tsk);
140 extern int copy_page_tables(struct task_struct * to);
141 extern int clone_page_tables(struct task_struct * to);
142 extern int unmap_page_range(unsigned long from, unsigned long size);
143 extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, int mask);
144 extern int zeromap_page_range(unsigned long from, unsigned long size, int mask);
145
146 extern void do_wp_page(unsigned long error_code, unsigned long address,
147 struct task_struct *tsk, unsigned long user_esp);
148 extern void do_no_page(unsigned long error_code, unsigned long address,
149 struct task_struct *tsk, unsigned long user_esp);
150
151 extern unsigned long paging_init(unsigned long start_mem, unsigned long end_mem);
152 extern void mem_init(unsigned long low_start_mem,
153 unsigned long start_mem, unsigned long end_mem);
154 extern void show_mem(void);
155 extern void oom(struct task_struct * task);
156 extern void si_meminfo(struct sysinfo * val);
157
158
159
160 extern void * vmalloc(unsigned long size);
161 extern void vfree(void * addr);
162 extern int vread(char *buf, char *addr, int count);
163
164
165
166 extern void swap_free(unsigned long page_nr);
167 extern unsigned long swap_duplicate(unsigned long page_nr);
168 extern void swap_in(unsigned long *table_ptr);
169 extern void si_swapinfo(struct sysinfo * val);
170 extern void rw_swap_page(int rw, unsigned long nr, char * buf);
171
172
173 extern int do_mmap(struct file * file, unsigned long addr, unsigned long len,
174 unsigned long prot, unsigned long flags, unsigned long off);
175 typedef int (*map_mergep_fnp)(const struct vm_area_struct *,
176 const struct vm_area_struct *, void *);
177 extern void merge_segments(struct vm_area_struct *, map_mergep_fnp, void *);
178 extern void insert_vm_struct(struct task_struct *, struct vm_area_struct *);
179 extern int ignoff_mergep(const struct vm_area_struct *,
180 const struct vm_area_struct *, void *);
181 extern int do_munmap(unsigned long, size_t);
182
183 #define read_swap_page(nr,buf) \
184 rw_swap_page(READ,(nr),(buf))
185 #define write_swap_page(nr,buf) \
186 rw_swap_page(WRITE,(nr),(buf))
187
188 #define invalidate() \
189 __asm__ __volatile__("movl %%cr3,%%eax\n\tmovl %%eax,%%cr3": : :"ax")
190
191 extern unsigned long high_memory;
192
193 #define MAP_NR(addr) ((addr) >> PAGE_SHIFT)
194 #define MAP_PAGE_RESERVED (1<<15)
195
196 extern unsigned short * mem_map;
197
198 #define PAGE_PRESENT 0x001
199 #define PAGE_RW 0x002
200 #define PAGE_USER 0x004
201 #define PAGE_PWT 0x008
202 #define PAGE_PCD 0x010
203 #define PAGE_ACCESSED 0x020
204 #define PAGE_DIRTY 0x040
205 #define PAGE_COW 0x200
206
207 #define PAGE_PRIVATE (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED | PAGE_COW)
208 #define PAGE_SHARED (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED)
209 #define PAGE_COPY (PAGE_PRESENT | PAGE_USER | PAGE_ACCESSED | PAGE_COW)
210 #define PAGE_READONLY (PAGE_PRESENT | PAGE_USER | PAGE_ACCESSED)
211 #define PAGE_TABLE (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED)
212
213 #define GFP_BUFFER 0x00
214 #define GFP_ATOMIC 0x01
215 #define GFP_USER 0x02
216 #define GFP_KERNEL 0x03
217 #define GFP_NOBUFFER 0x04
218
219
220
221 #define SHM_SWP_TYPE 0x41
222 extern void shm_no_page (ulong *);
223
224 #endif