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/fs.h>
6 #include <linux/kernel.h>
7
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21
22
23 struct vm_area_struct {
24 struct task_struct * vm_task;
25 unsigned long vm_start;
26 unsigned long vm_end;
27 unsigned short vm_page_prot;
28 struct vm_area_struct * vm_next;
29 struct vm_area_struct * vm_share;
30 struct inode * vm_inode;
31 unsigned long vm_offset;
32 struct vm_operations_struct * vm_ops;
33 };
34
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39
40
41 struct vm_operations_struct {
42 void (*open)(struct vm_area_struct * area);
43 void (*close)(struct vm_area_struct * area);
44 void (*nopage)(int error_code,
45 struct vm_area_struct * area, unsigned long address);
46 void (*wppage)(struct vm_area_struct * area, unsigned long address);
47 int (*share)(struct vm_area_struct * from, struct vm_area_struct * to, unsigned long address);
48 };
49
50 extern unsigned long __bad_page(void);
51 extern unsigned long __bad_pagetable(void);
52 extern unsigned long __zero_page(void);
53
54 #define BAD_PAGETABLE __bad_pagetable()
55 #define BAD_PAGE __bad_page()
56 #define ZERO_PAGE __zero_page()
57
58 extern volatile short free_page_ptr;
59
60 extern int nr_swap_pages;
61 extern int nr_free_pages;
62 extern unsigned long free_page_list;
63 extern int nr_secondary_pages;
64 extern unsigned long secondary_page_list;
65
66 #define MAX_SECONDARY_PAGES 10
67
68
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71
72
73 extern unsigned long __get_free_page(int priority);
74 extern inline unsigned long get_free_page(int priority)
75 {
76 unsigned long page;
77
78 page = __get_free_page(priority);
79 if (page)
80 __asm__ __volatile__("rep ; stosl"
81 : \
82 :"a" (0),"c" (1024),"D" (page)
83 :"di","cx");
84 return page;
85 }
86
87
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89
90
91 extern void free_page(unsigned long addr);
92 extern unsigned long put_dirty_page(struct task_struct * tsk,unsigned long page,
93 unsigned long address);
94 extern void free_page_tables(struct task_struct * tsk);
95 extern void clear_page_tables(struct task_struct * tsk);
96 extern int copy_page_tables(struct task_struct * to);
97 extern int clone_page_tables(struct task_struct * to);
98 extern int unmap_page_range(unsigned long from, unsigned long size);
99 extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, int mask);
100 extern int zeromap_page_range(unsigned long from, unsigned long size, int mask);
101
102 extern void do_wp_page(unsigned long error_code, unsigned long address,
103 struct task_struct *tsk, unsigned long user_esp);
104 extern void do_no_page(unsigned long error_code, unsigned long address,
105 struct task_struct *tsk, unsigned long user_esp);
106
107 extern unsigned long paging_init(unsigned long start_mem, unsigned long end_mem);
108 extern void mem_init(unsigned long low_start_mem,
109 unsigned long start_mem, unsigned long end_mem);
110 extern void show_mem(void);
111 extern void oom(struct task_struct * task);
112 extern void si_meminfo(struct sysinfo * val);
113
114
115
116 extern void swap_free(unsigned long page_nr);
117 extern unsigned long swap_duplicate(unsigned long page_nr);
118 extern void swap_in(unsigned long *table_ptr);
119 extern void si_swapinfo(struct sysinfo * val);
120 extern void rw_swap_page(int rw, unsigned long nr, char * buf);
121
122
123 extern int do_mmap(struct file * file, unsigned long addr, unsigned long len,
124 unsigned long prot, unsigned long flags, unsigned long off);
125
126 #define read_swap_page(nr,buf) \
127 rw_swap_page(READ,(nr),(buf))
128 #define write_swap_page(nr,buf) \
129 rw_swap_page(WRITE,(nr),(buf))
130
131 #define invalidate() \
132 __asm__ __volatile__("movl %%cr3,%%eax\n\tmovl %%eax,%%cr3": : :"ax")
133
134 extern unsigned long high_memory;
135
136 #define MAP_NR(addr) ((addr) >> PAGE_SHIFT)
137 #define MAP_PAGE_RESERVED (1<<15)
138
139 extern unsigned short * mem_map;
140
141 #define PAGE_PRESENT 0x001
142 #define PAGE_RW 0x002
143 #define PAGE_USER 0x004
144 #define PAGE_PWT 0x008
145 #define PAGE_PCD 0x010
146 #define PAGE_ACCESSED 0x020
147 #define PAGE_DIRTY 0x040
148 #define PAGE_COW 0x200
149
150 #define PAGE_PRIVATE (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED | PAGE_COW)
151 #define PAGE_SHARED (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED)
152 #define PAGE_COPY (PAGE_PRESENT | PAGE_USER | PAGE_ACCESSED | PAGE_COW)
153 #define PAGE_READONLY (PAGE_PRESENT | PAGE_USER | PAGE_ACCESSED)
154 #define PAGE_TABLE (PAGE_PRESENT | PAGE_RW | PAGE_USER | PAGE_ACCESSED)
155
156 #define GFP_BUFFER 0x00
157 #define GFP_ATOMIC 0x01
158 #define GFP_USER 0x02
159 #define GFP_KERNEL 0x03
160
161
162
163 #define SHM_SWP_TYPE 0x41
164 extern void shm_no_page (ulong *);
165
166 #endif