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9a8fd558 CZ |
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 */ | |
90f72aa5 AB |
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 */ | |
f6891ddb MF |
58 | #ifdef CONFIG_MMAP_ALLOW_UNINITIALIZED |
59 | # define MAP_UNINITIALIZED 0x4000000 /* For anonymous mmap, memory could be | |
60 | * uninitialized */ | |
61 | #else | |
62 | # define MAP_UNINITIALIZED 0x0 /* Don't support this flag */ | |
63 | #endif | |
9a8fd558 CZ |
64 | |
65 | /* | |
66 | * Flags for msync | |
67 | */ | |
68 | #define MS_ASYNC 0x0001 /* sync memory asynchronously */ | |
69 | #define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */ | |
70 | #define MS_SYNC 0x0004 /* synchronous memory sync */ | |
71 | ||
72 | /* | |
73 | * Flags for mlockall | |
74 | */ | |
75 | #define MCL_CURRENT 1 /* lock all current mappings */ | |
76 | #define MCL_FUTURE 2 /* lock all future mappings */ | |
b0f205c2 EM |
77 | #define MCL_ONFAULT 4 /* lock all pages that are faulted in */ |
78 | ||
79 | /* | |
80 | * Flags for mlock | |
81 | */ | |
82 | #define MLOCK_ONFAULT 0x01 /* Lock pages in range after they are faulted in, do not prefault */ | |
9a8fd558 | 83 | |
5f6164f3 MT |
84 | #define MADV_NORMAL 0 /* no further special treatment */ |
85 | #define MADV_RANDOM 1 /* expect random page references */ | |
86 | #define MADV_SEQUENTIAL 2 /* expect sequential page references */ | |
87 | #define MADV_WILLNEED 3 /* will need these pages */ | |
88 | #define MADV_DONTNEED 4 /* don't need these pages */ | |
89 | ||
90 | /* common parameters: try to keep these consistent across architectures */ | |
21f55b01 | 91 | #define MADV_FREE 8 /* free pages only if memory pressure */ |
5f6164f3 MT |
92 | #define MADV_REMOVE 9 /* remove these pages & resources */ |
93 | #define MADV_DONTFORK 10 /* don't inherit across fork */ | |
94 | #define MADV_DOFORK 11 /* do inherit across fork */ | |
9a8fd558 | 95 | |
d19f3524 HD |
96 | #define MADV_MERGEABLE 12 /* KSM may merge identical pages */ |
97 | #define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages */ | |
98 | ||
a826e422 | 99 | #define MADV_HUGEPAGE 14 /* Worth backing with hugepages */ |
1ddd6db4 | 100 | #define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages */ |
a826e422 | 101 | |
accb61fe JB |
102 | #define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, |
103 | overrides the coredump filter bits */ | |
104 | #define MADV_DODUMP 17 /* Clear the MADV_NODUMP flag */ | |
105 | ||
9a8fd558 | 106 | /* compatibility flags */ |
5f6164f3 | 107 | #define MAP_FILE 0 |
9a8fd558 | 108 | |
42d7395f AK |
109 | /* |
110 | * When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. | |
111 | * This gives us 6 bits, which is enough until someone invents 128 bit address | |
112 | * spaces. | |
113 | * | |
114 | * Assume these are all power of twos. | |
115 | * When 0 use the default page size. | |
116 | */ | |
117 | #define MAP_HUGE_SHIFT 26 | |
118 | #define MAP_HUGE_MASK 0x3f | |
119 | ||
9a8fd558 | 120 | #endif /* _XTENSA_MMAN_H */ |