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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/* 0x01 - 0x03 are defined in linux/mman.h */
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#define MAP_FIXED_NOREPLACE 0x100000 /* MAP_FIXED which doesn't unmap underlying mapping */
52
53/*
54 * Flags for msync
55 */
56#define MS_ASYNC 0x0001 /* sync memory asynchronously */
57#define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */
58#define MS_SYNC 0x0004 /* synchronous memory sync */
59
60/*
61 * Flags for mlockall
62 */
63#define MCL_CURRENT 1 /* lock all current mappings */
64#define MCL_FUTURE 2 /* lock all future mappings */
65#define MCL_ONFAULT 4 /* lock all pages that are faulted in */
66
67/*
68 * Flags for mlock
69 */
70#define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */
71
72#define MADV_NORMAL 0 /* no further special treatment */
73#define MADV_RANDOM 1 /* expect random page references */
74#define MADV_SEQUENTIAL 2 /* expect sequential page references */
75#define MADV_WILLNEED 3 /* will need these pages */
76#define MADV_DONTNEED 4 /* don't need these pages */
77
78/* common parameters: try to keep these consistent across architectures */
79#define MADV_FREE 8 /* free pages only if memory pressure */
80#define MADV_REMOVE 9 /* remove these pages & resources */
81#define MADV_DONTFORK 10 /* don't inherit across fork */
82#define MADV_DOFORK 11 /* do inherit across fork */
83
84#define MADV_MERGEABLE 12 /* KSM may merge identical pages */
85#define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */
86#define MADV_HWPOISON 100 /* poison a page for testing */
87
88#define MADV_HUGEPAGE 14 /* Worth backing with hugepages */
89#define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */
90
91#define MADV_DONTDUMP 16 /* Explicitly exclude from core dump,
92 overrides the coredump filter bits */
93#define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */
94
95#define MADV_WIPEONFORK 18 /* Zero memory on fork, child only */
96#define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK */
97
98#define MADV_COLD 20 /* deactivate these pages */
99#define MADV_PAGEOUT 21 /* reclaim these pages */
100
101#define MADV_POPULATE_READ 22 /* populate (prefault) page tables readable */
102#define MADV_POPULATE_WRITE 23 /* populate (prefault) page tables writable */
103
104#define MADV_DONTNEED_LOCKED 24 /* like DONTNEED, but drop locked pages too */
105
106#define MADV_COLLAPSE 25 /* Synchronous hugepage collapse */
107
108#define MADV_GUARD_INSTALL 102 /* fatal signal on access to range */
109#define MADV_GUARD_REMOVE 103 /* unguard range */
110
111/* compatibility flags */
112#define MAP_FILE 0
113
114#define PKEY_DISABLE_ACCESS 0x1
115#define PKEY_DISABLE_WRITE 0x2
116#define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\
117 PKEY_DISABLE_WRITE)
118
119#endif /* _ASM_MMAN_H */