• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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, 2002 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	0x00		/* page can not be accessed */
19 #define PROT_READ	0x01		/* page can be read */
20 #define PROT_WRITE	0x02		/* page can be written */
21 #define PROT_EXEC	0x04		/* page can be executed */
22 /*			0x08		   reserved for PROT_EXEC_NOFLUSH */
23 #define PROT_SEM	0x10		/* page may be used for atomic ops */
24 #define PROT_GROWSDOWN	0x01000000	/* mprotect flag: extend change to start of growsdown vma */
25 #define PROT_GROWSUP	0x02000000	/* mprotect flag: extend change to end of growsup vma */
26 
27 /*
28  * Flags for mmap
29  */
30 #define MAP_SHARED	0x001		/* Share changes */
31 #define MAP_PRIVATE	0x002		/* Changes are private */
32 #define MAP_SHARED_VALIDATE 0x003	/* share + validate extension flags */
33 #define MAP_TYPE	0x00f		/* Mask for type of mapping */
34 #define MAP_FIXED	0x010		/* Interpret addr exactly */
35 
36 /* not used by linux, but here to make sure we don't clash with ABI defines */
37 #define MAP_RENAME	0x020		/* Assign page to file */
38 #define MAP_AUTOGROW	0x040		/* File may grow by writing */
39 #define MAP_LOCAL	0x080		/* Copy on fork/sproc */
40 #define MAP_AUTORSRV	0x100		/* Logical swap reserved on demand */
41 
42 /* These are linux-specific */
43 #define MAP_NORESERVE	0x0400		/* don't check for reservations */
44 #define MAP_ANONYMOUS	0x0800		/* don't use a file */
45 #define MAP_GROWSDOWN	0x1000		/* stack-like segment */
46 #define MAP_DENYWRITE	0x2000		/* ETXTBSY */
47 #define MAP_EXECUTABLE	0x4000		/* mark it as an executable */
48 #define MAP_LOCKED	0x8000		/* pages are locked */
49 #define MAP_POPULATE	0x10000		/* populate (prefault) pagetables */
50 #define MAP_NONBLOCK	0x20000		/* do not block on IO */
51 #define MAP_STACK	0x40000		/* give out an address that is best suited for process/thread stacks */
52 #define MAP_HUGETLB	0x80000		/* create a huge page mapping */
53 #define MAP_FIXED_NOREPLACE 0x100000	/* MAP_FIXED which doesn't unmap underlying mapping */
54 
55 /*
56  * Flags for msync
57  */
58 #define MS_ASYNC	0x0001		/* sync memory asynchronously */
59 #define MS_INVALIDATE	0x0002		/* invalidate mappings & caches */
60 #define MS_SYNC		0x0004		/* synchronous memory sync */
61 
62 /*
63  * Flags for mlockall
64  */
65 #define MCL_CURRENT	1		/* lock all current mappings */
66 #define MCL_FUTURE	2		/* lock all future mappings */
67 #define MCL_ONFAULT	4		/* lock all pages that are faulted in */
68 
69 /*
70  * Flags for mlock
71  */
72 #define MLOCK_ONFAULT	0x01		/* Lock pages in range after they are faulted in, do not prefault */
73 
74 #define MADV_NORMAL	0		/* no further special treatment */
75 #define MADV_RANDOM	1		/* expect random page references */
76 #define MADV_SEQUENTIAL 2		/* expect sequential page references */
77 #define MADV_WILLNEED	3		/* will need these pages */
78 #define MADV_DONTNEED	4		/* don't need these pages */
79 
80 /* common parameters: try to keep these consistent across architectures */
81 #define MADV_FREE	8		/* free pages only if memory pressure */
82 #define MADV_REMOVE	9		/* remove these pages & resources */
83 #define MADV_DONTFORK	10		/* don't inherit across fork */
84 #define MADV_DOFORK	11		/* do inherit across fork */
85 
86 #define MADV_MERGEABLE	 12		/* KSM may merge identical pages */
87 #define MADV_UNMERGEABLE 13		/* KSM may not merge identical pages */
88 #define MADV_HWPOISON	 100		/* poison a page for testing */
89 
90 #define MADV_HUGEPAGE	14		/* Worth backing with hugepages */
91 #define MADV_NOHUGEPAGE 15		/* Not worth backing with hugepages */
92 
93 #define MADV_DONTDUMP	16		/* Explicity exclude from the core dump,
94 					   overrides the coredump filter bits */
95 #define MADV_DODUMP	17		/* Clear the MADV_NODUMP flag */
96 
97 #define MADV_WIPEONFORK 18		/* Zero memory on fork, child only */
98 #define MADV_KEEPONFORK 19		/* Undo MADV_WIPEONFORK */
99 
100 /* compatibility flags */
101 #define MAP_FILE	0
102 
103 #define PKEY_DISABLE_ACCESS	0x1
104 #define PKEY_DISABLE_WRITE	0x2
105 #define PKEY_ACCESS_MASK	(PKEY_DISABLE_ACCESS |\
106 				 PKEY_DISABLE_WRITE)
107 
108 #endif /* _ASM_MMAN_H */
109