1 /*
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 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 0x0 /* page can not be accessed */
18 #define PROT_READ 0x1 /* page can be read */
19 #define PROT_WRITE 0x2 /* page can be written */
20 #define PROT_EXEC 0x4 /* page can be executed */
21
22 /*
23 * Flags for mmap
24 */
25 #define MAP_SHARED 0x001 /* Share changes */
26 #define MAP_PRIVATE 0x002 /* Changes are private */
27 #define MAP_TYPE 0x00f /* Mask for type of mapping */
28 #define MAP_FIXED 0x010 /* Interpret addr exactly */
29
30 /* not used by linux, but here to make sure we don't clash with ABI defines */
31 #define MAP_RENAME 0x020 /* Assign page to file */
32 #define MAP_AUTOGROW 0x040 /* File may grow by writing */
33 #define MAP_LOCAL 0x080 /* Copy on fork/sproc */
34 #define MAP_AUTORSRV 0x100 /* Logical swap reserved on demand */
35
36 /* These are linux-specific */
37 #define MAP_NORESERVE 0x0400 /* don't check for reservations */
38 #define MAP_ANONYMOUS 0x0800 /* don't use a file */
39 #define MAP_GROWSDOWN 0x1000 /* stack-like segment */
40 #define MAP_DENYWRITE 0x2000 /* ETXTBSY */
41 #define MAP_EXECUTABLE 0x4000 /* mark it as an executable */
42 #define MAP_LOCKED 0x8000 /* pages are locked */
43
44 /*
45 * Flags for msync
46 */
47 #define MS_ASYNC 0x0001 /* sync memory asynchronously */
48 #define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */
49 #define MS_SYNC 0x0004 /* synchronous memory sync */
50
51 /*
52 * Flags for mlockall
53 */
54 #define MCL_CURRENT 1 /* lock all current mappings */
55 #define MCL_FUTURE 2 /* lock all future mappings */
56
57 #define MADV_NORMAL 0x0 /* default page-in behavior */
58 #define MADV_RANDOM 0x1 /* page-in minimum required */
59 #define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */
60 #define MADV_WILLNEED 0x3 /* pre-fault pages */
61 #define MADV_DONTNEED 0x4 /* discard these pages */
62
63 /* compatibility flags */
64 #define MAP_ANON MAP_ANONYMOUS
65 #define MAP_FILE 0
66
67 #endif /* _ASM_MMAN_H */
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