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mman.h
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1 /*
2  * include/asm-xtensa/mman.h
3  *
4  * Xtensa Processor memory-manager definitions
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License. See the file "COPYING" in the main directory of this archive
8  * for more details.
9  *
10  * Copyright (C) 1995 by Ralf Baechle
11  * Copyright (C) 2001 - 2005 Tensilica Inc.
12  */
13 
14 #ifndef _XTENSA_MMAN_H
15 #define _XTENSA_MMAN_H
16 
17 /*
18  * Protections are chosen from these bits, OR'd together. The
19  * implementation does not necessarily support PROT_EXEC or PROT_WRITE
20  * without PROT_READ. The only guarantees are that no writing will be
21  * allowed without PROT_WRITE and no access will be allowed for PROT_NONE.
22  */
23 
24 #define PROT_NONE 0x0 /* page can not be accessed */
25 #define PROT_READ 0x1 /* page can be read */
26 #define PROT_WRITE 0x2 /* page can be written */
27 #define PROT_EXEC 0x4 /* page can be executed */
28 
29 #define PROT_SEM 0x10 /* page may be used for atomic ops */
30 #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */
31 #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end fo growsup vma */
32 
33 /*
34  * Flags for mmap
35  */
36 #define MAP_SHARED 0x001 /* Share changes */
37 #define MAP_PRIVATE 0x002 /* Changes are private */
38 #define MAP_TYPE 0x00f /* Mask for type of mapping */
39 #define MAP_FIXED 0x010 /* Interpret addr exactly */
40 
41 /* not used by linux, but here to make sure we don't clash with ABI defines */
42 #define MAP_RENAME 0x020 /* Assign page to file */
43 #define MAP_AUTOGROW 0x040 /* File may grow by writing */
44 #define MAP_LOCAL 0x080 /* Copy on fork/sproc */
45 #define MAP_AUTORSRV 0x100 /* Logical swap reserved on demand */
46 
47 /* These are linux-specific */
48 #define MAP_NORESERVE 0x0400 /* don't check for reservations */
49 #define MAP_ANONYMOUS 0x0800 /* don't use a file */
50 #define MAP_GROWSDOWN 0x1000 /* stack-like segment */
51 #define MAP_DENYWRITE 0x2000 /* ETXTBSY */
52 #define MAP_EXECUTABLE 0x4000 /* mark it as an executable */
53 #define MAP_LOCKED 0x8000 /* pages are locked */
54 #define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */
55 #define MAP_NONBLOCK 0x20000 /* do not block on IO */
56 #define MAP_STACK 0x40000 /* give out an address that is best suited for process/thread stacks */
57 #define MAP_HUGETLB 0x80000 /* create a huge page mapping */
58 
59 /*
60  * Flags for msync
61  */
62 #define MS_ASYNC 0x0001 /* sync memory asynchronously */
63 #define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */
64 #define MS_SYNC 0x0004 /* synchronous memory sync */
65 
66 /*
67  * Flags for mlockall
68  */
69 #define MCL_CURRENT 1 /* lock all current mappings */
70 #define MCL_FUTURE 2 /* lock all future mappings */
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_REMOVE 9 /* remove these pages & resources */
80 #define MADV_DONTFORK 10 /* don't inherit across fork */
81 #define MADV_DOFORK 11 /* do inherit across fork */
82 
83 #define MADV_MERGEABLE 12 /* KSM may merge identical pages */
84 #define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */
85 
86 #define MADV_HUGEPAGE 14 /* Worth backing with hugepages */
87 #define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */
88 
89 #define MADV_DONTDUMP 16 /* Explicity exclude from the core dump,
90  overrides the coredump filter bits */
91 #define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */
92 
93 /* compatibility flags */
94 #define MAP_FILE 0
95 
96 #endif /* _XTENSA_MMAN_H */