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, 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#define MAP_STACK	0x40000		/* give out an address that is best suited for process/thread stacks */
50#define MAP_HUGETLB	0x80000		/* create a huge page mapping */
51
52/*
53 * Flags for msync
54 */
55#define MS_ASYNC	0x0001		/* sync memory asynchronously */
56#define MS_INVALIDATE	0x0002		/* invalidate mappings & caches */
57#define MS_SYNC		0x0004		/* synchronous memory sync */
58
59/*
60 * Flags for mlockall
61 */
62#define MCL_CURRENT	1		/* lock all current mappings */
63#define MCL_FUTURE	2		/* lock all future mappings */
64
65#define MADV_NORMAL	0		/* no further special treatment */
66#define MADV_RANDOM	1		/* expect random page references */
67#define MADV_SEQUENTIAL	2		/* expect sequential page references */
68#define MADV_WILLNEED	3		/* will need these pages */
69#define MADV_DONTNEED	4		/* don't need these pages */
70
71/* common parameters: try to keep these consistent across architectures */
72#define MADV_REMOVE	9		/* remove these pages & resources */
73#define MADV_DONTFORK	10		/* don't inherit across fork */
74#define MADV_DOFORK	11		/* do inherit across fork */
75
76#define MADV_MERGEABLE   12		/* KSM may merge identical pages */
77#define MADV_UNMERGEABLE 13		/* KSM may not merge identical pages */
78#define MADV_HWPOISON    100		/* poison a page for testing */
79
80#define MADV_HUGEPAGE	14		/* Worth backing with hugepages */
81#define MADV_NOHUGEPAGE	15		/* Not worth backing with hugepages */
82
83#define MADV_DONTDUMP   16		/* Explicity exclude from the core dump,
84					   overrides the coredump filter bits */
85#define MADV_DODUMP	17		/* Clear the MADV_NODUMP flag */
86
87/* compatibility flags */
88#define MAP_FILE	0
89
90#endif /* _ASM_MMAN_H */
91