| 1 | /* |
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| 2 | * This file is subject to the terms and conditions of the GNU General Public |
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| 3 | * License. See the file "COPYING" in the main directory of this archive |
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| 4 | * for more details. |
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| 5 | * |
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| 6 | * Copyright (C) 1995, 1999, 2002 by Ralf Baechle |
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| 7 | */ |
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| 8 | #ifndef _ASM_MMAN_H |
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| 9 | #define _ASM_MMAN_H |
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| 10 | |
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| 11 | /* |
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| 12 | * Protections are chosen from these bits, OR'd together. The |
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| 13 | * implementation does not necessarily support PROT_EXEC or PROT_WRITE |
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| 14 | * without PROT_READ. The only guarantees are that no writing will be |
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| 15 | * allowed without PROT_WRITE and no access will be allowed for PROT_NONE. |
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| 16 | */ |
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| 17 | #define PROT_NONE 0x00 /* page can not be accessed */ |
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| 18 | #define PROT_READ 0x01 /* page can be read */ |
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| 19 | #define PROT_WRITE 0x02 /* page can be written */ |
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| 20 | #define PROT_EXEC 0x04 /* page can be executed */ |
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| 21 | /* 0x08 reserved for PROT_EXEC_NOFLUSH */ |
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| 22 | #define PROT_SEM 0x10 /* page may be used for atomic ops */ |
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| 23 | #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ |
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| 24 | #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */ |
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| 25 | |
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| 26 | /* |
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| 27 | * Flags for mmap |
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| 28 | */ |
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| 29 | #define MAP_SHARED 0x001 /* Share changes */ |
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| 30 | #define MAP_PRIVATE 0x002 /* Changes are private */ |
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| 31 | #define MAP_TYPE 0x00f /* Mask for type of mapping */ |
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| 32 | #define MAP_FIXED 0x010 /* Interpret addr exactly */ |
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| 33 | |
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| 34 | /* not used by linux, but here to make sure we don't clash with ABI defines */ |
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| 35 | #define MAP_RENAME 0x020 /* Assign page to file */ |
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| 36 | #define MAP_AUTOGROW 0x040 /* File may grow by writing */ |
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| 37 | #define MAP_LOCAL 0x080 /* Copy on fork/sproc */ |
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| 38 | #define MAP_AUTORSRV 0x100 /* Logical swap reserved on demand */ |
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| 39 | |
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| 40 | /* These are linux-specific */ |
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| 41 | #define MAP_NORESERVE 0x0400 /* don't check for reservations */ |
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| 42 | #define MAP_ANONYMOUS 0x0800 /* don't use a file */ |
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| 43 | #define MAP_GROWSDOWN 0x1000 /* stack-like segment */ |
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| 44 | #define MAP_DENYWRITE 0x2000 /* ETXTBSY */ |
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| 45 | #define MAP_EXECUTABLE 0x4000 /* mark it as an executable */ |
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| 46 | #define MAP_LOCKED 0x8000 /* pages are locked */ |
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| 47 | #define MAP_POPULATE 0x10000 /* populate (prefault) pagetables */ |
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| 48 | #define MAP_NONBLOCK 0x20000 /* do not block on IO */ |
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| 49 | |
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| 50 | /* |
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| 51 | * Flags for msync |
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| 52 | */ |
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| 53 | #define MS_ASYNC 0x0001 /* sync memory asynchronously */ |
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| 54 | #define MS_INVALIDATE 0x0002 /* invalidate mappings & caches */ |
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| 55 | #define MS_SYNC 0x0004 /* synchronous memory sync */ |
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| 56 | |
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| 57 | /* |
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| 58 | * Flags for mlockall |
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| 59 | */ |
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| 60 | #define MCL_CURRENT 1 /* lock all current mappings */ |
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| 61 | #define MCL_FUTURE 2 /* lock all future mappings */ |
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| 62 | |
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| 63 | #define MADV_NORMAL 0x0 /* default page-in behavior */ |
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| 64 | #define MADV_RANDOM 0x1 /* page-in minimum required */ |
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| 65 | #define MADV_SEQUENTIAL 0x2 /* read-ahead aggressively */ |
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| 66 | #define MADV_WILLNEED 0x3 /* pre-fault pages */ |
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| 67 | #define MADV_DONTNEED 0x4 /* discard these pages */ |
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| 68 | |
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| 69 | /* compatibility flags */ |
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| 70 | #define MAP_ANON MAP_ANONYMOUS |
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| 71 | #define MAP_FILE 0 |
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| 72 | |
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| 73 | #endif /* _ASM_MMAN_H */ |
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