source: GPL/include/linux/mm.h@ 18

Last change on this file since 18 was 18, checked in by vladest, 20 years ago

initial import
File size: 5.2 KB
Line 
1#ifndef _LINUX_MM_H
2#define _LINUX_MM_H
3
4#include <linux/sched.h>
5#include <linux/errno.h>
6#include <asm/page.h>
7#include <asm/atomic.h>
8
9/*
10 * GFP bitmasks..
11 */
12#define __GFP_WAIT 0x01
13#define __GFP_LOW 0x02
14#define __GFP_MED 0x04
15#define __GFP_HIGH 0x08
16#define __GFP_IO 0x10
17#define __GFP_SWAP 0x20
18#ifdef CONFIG_HIGHMEM
19#define __GFP_HIGHMEM 0x40
20#else
21#define __GFP_HIGHMEM 0x0 /* noop */
22#endif
23
24#define __GFP_DMA 0x80
25
26#ifdef TARGET_OS2
27#define __GFP_DMAHIGHMEM 0x100
28#define GFP_DMAHIGHMEM __GFP_DMAHIGHMEM
29#endif
30
31#define GFP_BUFFER (__GFP_LOW | __GFP_WAIT)
32#define GFP_ATOMIC (__GFP_HIGH)
33#define GFP_USER (__GFP_LOW | __GFP_WAIT | __GFP_IO)
34#define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM)
35#define GFP_KERNEL (__GFP_MED | __GFP_WAIT | __GFP_IO)
36#define GFP_NFS (__GFP_HIGH | __GFP_WAIT | __GFP_IO)
37#define GFP_KSWAPD (__GFP_IO | __GFP_SWAP)
38
39/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
40 platforms, used as appropriate on others */
41
42#define GFP_DMA __GFP_DMA
43
44/* Flag - indicates that the buffer can be taken from high memory which is not
45 directly addressable by the kernel */
46
47#define GFP_HIGHMEM __GFP_HIGHMEM
48
49/*
50 * This struct defines a memory VMM memory area. There is one of these
51 * per VM-area/task. A VM area is any part of the process virtual memory
52 * space that has a special rule for the page-fault handlers (ie a shared
53 * library, the executable area etc).
54 */
55struct vm_area_struct {
56 struct mm_struct * vm_mm; /* VM area parameters */
57 unsigned long vm_start;
58 unsigned long vm_end;
59
60 /* linked list of VM areas per task, sorted by address */
61 struct vm_area_struct *vm_next;
62
63 pgprot_t vm_page_prot;
64 unsigned short vm_flags;
65
66 /* AVL tree of VM areas per task, sorted by address */
67 short vm_avl_height;
68 struct vm_area_struct * vm_avl_left;
69 struct vm_area_struct * vm_avl_right;
70
71 /* For areas with inode, the list inode->i_mmap, for shm areas,
72 * the list of attaches, otherwise unused.
73 */
74 struct vm_area_struct *vm_next_share;
75 struct vm_area_struct **vm_pprev_share;
76
77 struct vm_operations_struct * vm_ops;
78 unsigned long vm_pgoff; /* offset in PAGE_SIZE units, *not* PAGE_CACHE_SIZE */
79 struct file * vm_file;
80 void * vm_private_data; /* was vm_pte (shared mem) */
81};
82
83/*
84 * vm_flags..
85 */
86#define VM_READ 0x0001 /* currently active flags */
87#define VM_WRITE 0x0002
88#define VM_EXEC 0x0004
89#define VM_SHARED 0x0008
90
91#define VM_MAYREAD 0x0010 /* limits for mprotect() etc */
92#define VM_MAYWRITE 0x0020
93#define VM_MAYEXEC 0x0040
94#define VM_MAYSHARE 0x0080
95
96#define VM_GROWSDOWN 0x0100 /* general info on the segment */
97#define VM_GROWSUP 0x0200
98#define VM_SHM 0x0400 /* shared memory area, don't swap out */
99#define VM_DENYWRITE 0x0800 /* ETXTBSY on write attempts.. */
100
101#define VM_EXECUTABLE 0x1000
102#define VM_LOCKED 0x2000
103#define VM_IO 0x4000 /* Memory mapped I/O or similar */
104
105#define VM_STACK_FLAGS 0x0177
106
107/* Page flag bit values */
108#define PG_locked 0
109#define PG_error 1
110#define PG_referenced 2
111#define PG_uptodate 3
112#define PG_decr_after 5
113#define PG_DMA 7
114#define PG_slab 8
115#define PG_swap_cache 9
116#define PG_skip 10
117#define PG_swap_entry 11
118#define PG_highmem 12
119 /* bits 21-30 unused */
120#define PG_reserved 31
121
122typedef struct page {
123 unsigned long index;
124 atomic_t count;
125 unsigned long flags; /* atomic flags, some possibly updated asynchronously */
126 unsigned long virtual; /* nonzero if kmapped */
127} mem_map_t;
128
129extern mem_map_t * mem_map;
130
131#define free_page(addr) free_pages((addr),0)
132extern int free_pages(unsigned long addr, unsigned long order);
133
134#define virt_to_bus virt_to_phys
135extern unsigned long virt_to_phys(void * address);
136
137extern mem_map_t *virt_to_page(int x);
138
139extern void * phys_to_virt(unsigned long address);
140
141#define __get_free_page(gfp_mask) __get_free_pages((gfp_mask),0)
142#define __get_dma_pages(gfp_mask, order) __get_free_pages((gfp_mask) | GFP_DMA,(order))
143
144extern void *__get_free_pages(int gfp_mask, unsigned long order);
145extern struct page * alloc_pages(int gfp_mask, unsigned long order);
146
147extern int remap_page_range(unsigned long from, unsigned long to, unsigned long size, pgprot_t prot);
148
149/*
150 * Error return values for the *_nopage functions
151 */
152#define NOPAGE_SIGBUS (NULL)
153#define NOPAGE_OOM -1
154
155/*
156 * These are the virtual MM functions - opening of an area, closing and
157 * unmapping it (needed to keep files on disk up-to-date etc), pointer
158 * to the functions called when a no-page or a wp-page exception occurs.
159 */
160struct vm_operations_struct {
161 void (*open)(struct vm_area_struct * area);
162 void (*close)(struct vm_area_struct * area);
163 void (*unmap)(struct vm_area_struct *area, unsigned long, size_t);
164 void (*protect)(struct vm_area_struct *area, unsigned long, size_t, unsigned int newprot);
165 int (*sync)(struct vm_area_struct *area, unsigned long, size_t, unsigned int flags);
166 void (*advise)(struct vm_area_struct *area, unsigned long, size_t, unsigned int advise);
167 struct page * (*nopage)(struct vm_area_struct * area, unsigned long address, int write_access);
168 struct page * (*wppage)(struct vm_area_struct * area, unsigned long address, struct page * page);
169 int (*swapout)(struct page *, struct file *);
170};
171
172#endif
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