1 /* $Id: mman.h,v 1.3 2000/02/04 23:12:27 ralf Exp $
2 *
3 * This file is subject to the terms and conditions of the GNU General Public
4 * License. See the file "COPYING" in the main directory of this archive
5 * for more details.
6 *
7 * Copyright (C) 1995, 1999 by Ralf Baechle
8 */
9 #ifndef _ASM_MMAN_H
10 #define _ASM_MMAN_H
11
12 /*
13 * Protections are chosen from these bits, OR'd together. The
14 * implementation does not necessarily support PROT_EXEC or PROT_WRITE
15 * without PROT_READ. The only guarantees are that no writing will be
16 * allowed without PROT_WRITE and no access will be allowed for PROT_NONE.
17 */
18 #define PROT_NONE 0x0 /* page can not be accessed */
19 #define PROT_READ 0x1 /* page can be read */
20 #define PROT_WRITE 0x2 /* page can be written */
21 #define PROT_EXEC 0x4 /* page can be executed */
22
23 /*
24 * Flags for mmap
25 */
26 #define MAP_SHARED 0x001 /* Share changes */
27 #define MAP_PRIVATE 0x002 /* Changes are private */
28 #define MAP_TYPE 0x00f /* Mask for type of mapping */
29 #define MAP_FIXED 0x010 /* Interpret addr exactly */
30
31 /* not used by linux, but here to make sure we don't clash with ABI defines */
32 #define MAP_RENAME 0x020 /* Assign page to file */
33 #define MAP_AUTOGROW 0x040 /* File may grow by writing */
34 #define MAP_LOCAL 0x080 /* Copy on fork/sproc */
35 #define MAP_AUTORSRV 0x100 /* Logical swap reserved on demand */
36
37 /* These are linux-specific */
38 #define MAP_NORESERVE 0x0400 /* don't check for reservations */
39 #define MAP_ANONYMOUS 0x0800 /* don't use a file */
40 #define MAP_GROWSDOWN 0x1000 /* stack-like segment */
41 #define MAP_DENYWRITE 0x2000 /* ETXTBSY */
42 #define MAP_EXECUTABLE 0x4000 /* mark it as an executable */
43 #define MAP_LOCKED 0x8000 /* pages are locked */
44
45 /*
46 * Flags for msync
47 */
48 #define MS_ASYNC 0x0001 /* sync memory asynchronously */
49 #define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */
50 #define MS_SYNC 0x0004 /* synchronous memory sync */
51
52 /*
53 * Flags for mlockall
54 */
55 #define MCL_CURRENT 1 /* lock all current mappings */
56 #define MCL_FUTURE 2 /* lock all future mappings */
57
58 #define MADV_NORMAL 0x0 /* default page-in behavior */
59 #define MADV_RANDOM 0x1 /* page-in minimum required */
60 #define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
61 #define MADV_WILLNEED 0x3 /* pre-fault pages */
62 #define MADV_DONTNEED 0x4 /* discard these pages */
63
64 /* compatibility flags */
65 #define MAP_ANON MAP_ANONYMOUS
66 #define MAP_FILE 0
67
68 #endif /* _ASM_MMAN_H */
69
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