blob: 62060957ba93a743d8b8ceaa11b11f2706ffb578 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1995, 1999, 2002 by Ralf Baechle
7 */
8#ifndef _ASM_MMAN_H
9#define _ASM_MMAN_H
10
11/*
12 * Protections are chosen from these bits, OR'd together. The
13 * implementation does not necessarily support PROT_EXEC or PROT_WRITE
14 * without PROT_READ. The only guarantees are that no writing will be
15 * allowed without PROT_WRITE and no access will be allowed for PROT_NONE.
16 */
17#define PROT_NONE 0x00 /* page can not be accessed */
18#define PROT_READ 0x01 /* page can be read */
19#define PROT_WRITE 0x02 /* page can be written */
20#define PROT_EXEC 0x04 /* page can be executed */
21/* 0x08 reserved for PROT_EXEC_NOFLUSH */
22#define PROT_SEM 0x10 /* page may be used for atomic ops */
23#define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */
24#define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */
25
26/*
27 * Flags for mmap
28 */
29#define MAP_SHARED 0x001 /* Share changes */
30#define MAP_PRIVATE 0x002 /* Changes are private */
31#define MAP_TYPE 0x00f /* Mask for type of mapping */
32#define MAP_FIXED 0x010 /* Interpret addr exactly */
33
34/* not used by linux, but here to make sure we don't clash with ABI defines */
35#define MAP_RENAME 0x020 /* Assign page to file */
36#define MAP_AUTOGROW 0x040 /* File may grow by writing */
37#define MAP_LOCAL 0x080 /* Copy on fork/sproc */
38#define MAP_AUTORSRV 0x100 /* Logical swap reserved on demand */
39
40/* These are linux-specific */
41#define MAP_NORESERVE 0x0400 /* don't check for reservations */
42#define MAP_ANONYMOUS 0x0800 /* don't use a file */
43#define MAP_GROWSDOWN 0x1000 /* stack-like segment */
44#define MAP_DENYWRITE 0x2000 /* ETXTBSY */
45#define MAP_EXECUTABLE 0x4000 /* mark it as an executable */
46#define MAP_LOCKED 0x8000 /* pages are locked */
47#define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
48#define MAP_NONBLOCK 0x20000 /* do not block on IO */
49
50/*
51 * Flags for msync
52 */
53#define MS_ASYNC 0x0001 /* sync memory asynchronously */
54#define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */
55#define MS_SYNC 0x0004 /* synchronous memory sync */
56
57/*
58 * Flags for mlockall
59 */
60#define MCL_CURRENT 1 /* lock all current mappings */
61#define MCL_FUTURE 2 /* lock all future mappings */
62
63#define MADV_NORMAL 0x0 /* default page-in behavior */
64#define MADV_RANDOM 0x1 /* page-in minimum required */
65#define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
66#define MADV_WILLNEED 0x3 /* pre-fault pages */
67#define MADV_DONTNEED 0x4 /* discard these pages */
68
69/* compatibility flags */
70#define MAP_ANON MAP_ANONYMOUS
71#define MAP_FILE 0
72
73#endif /* _ASM_MMAN_H */