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001: /* Definitions for POSIX memory map interface.  Linux/x86_64 version.
002:    Copyright (C) 2001,2003,2005,2006,2009,2010,2011
003:    Free Software Foundation, Inc.
004:    This file is part of the GNU C Library.
005: 
006:    The GNU C Library is free software; you can redistribute it and/or
007:    modify it under the terms of the GNU Lesser General Public
008:    License as published by the Free Software Foundation; either
009:    version 2.1 of the License, or (at your option) any later version.
010: 
011:    The GNU C Library is distributed in the hope that it will be useful,
012:    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:    Lesser General Public License for more details.
015: 
016:    You should have received a copy of the GNU Lesser General Public
017:    License along with the GNU C Library; if not, write to the Free
018:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
019:    02111-1307 USA.  */
020: 
021: #ifndef _SYS_MMAN_H
022: # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
023: #endif
024: 
025: /* The following definitions basically come from the kernel headers.
026:    But the kernel header is not namespace clean.  */
027: 
028: 
029: /* Protections are chosen from these bits, OR'd together.  The
030:    implementation does not necessarily support PROT_EXEC or PROT_WRITE
031:    without PROT_READ.  The only guarantees are that no writing will be
032:    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
033: 
034: #define PROT_READ       0x1             /* Page can be read.  */
035: #define PROT_WRITE      0x2             /* Page can be written.  */
036: #define PROT_EXEC       0x4             /* Page can be executed.  */
037: #define PROT_NONE       0x0             /* Page can not be accessed.  */
038: #define PROT_GROWSDOWN  0x01000000      /* Extend change to start of
039:                                            growsdown vma (mprotect only).  */
040: #define PROT_GROWSUP    0x02000000      /* Extend change to start of
041:                                            growsup vma (mprotect only).  */
042: 
043: /* Sharing types (must choose one and only one of these).  */
044: #define MAP_SHARED      0x01            /* Share changes.  */
045: #define MAP_PRIVATE     0x02            /* Changes are private.  */
046: #ifdef __USE_MISC
047: # define MAP_TYPE       0x0f            /* Mask for type of mapping.  */
048: #endif
049: 
050: /* Other flags.  */
051: #define MAP_FIXED       0x10            /* Interpret addr exactly.  */
052: #ifdef __USE_MISC
053: # define MAP_FILE       0
054: # define MAP_ANONYMOUS  0x20            /* Don't use a file.  */
055: # define MAP_ANON       MAP_ANONYMOUS
056: # define MAP_32BIT      0x40            /* Only give out 32-bit addresses.  */
057: #endif
058: 
059: /* These are Linux-specific.  */
060: #ifdef __USE_MISC
061: # define MAP_GROWSDOWN  0x00100         /* Stack-like segment.  */
062: # define MAP_DENYWRITE  0x00800         /* ETXTBSY */
063: # define MAP_EXECUTABLE 0x01000         /* Mark it as an executable.  */
064: # define MAP_LOCKED     0x02000         /* Lock the mapping.  */
065: # define MAP_NORESERVE  0x04000         /* Don't check for reservations.  */
066: # define MAP_POPULATE   0x08000         /* Populate (prefault) pagetables.  */
067: # define MAP_NONBLOCK   0x10000         /* Do not block on IO.  */
068: # define MAP_STACK      0x20000         /* Allocation is for a stack.  */
069: # define MAP_HUGETLB    0x40000         /* Create huge page mapping.  */
070: #endif
071: 
072: /* Flags to `msync'.  */
073: #define MS_ASYNC        1               /* Sync memory asynchronously.  */
074: #define MS_SYNC         4               /* Synchronous memory sync.  */
075: #define MS_INVALIDATE   2               /* Invalidate the caches.  */
076: 
077: /* Flags for `mlockall'.  */
078: #define MCL_CURRENT     1               /* Lock all currently mapped pages.  */
079: #define MCL_FUTURE      2               /* Lock all additions to address
080:                                            space.  */
081: 
082: /* Flags for `mremap'.  */
083: #ifdef __USE_GNU
084: # define MREMAP_MAYMOVE 1
085: # define MREMAP_FIXED   2
086: #endif
087: 
088: /* Advice to `madvise'.  */
089: #ifdef __USE_BSD
090: # define MADV_NORMAL      0     /* No further special treatment.  */
091: # define MADV_RANDOM      1     /* Expect random page references.  */
092: # define MADV_SEQUENTIAL  2     /* Expect sequential page references.  */
093: # define MADV_WILLNEED    3     /* Will need these pages.  */
094: # define MADV_DONTNEED    4     /* Don't need these pages.  */
095: # define MADV_REMOVE      9     /* Remove these pages and resources.  */
096: # define MADV_DONTFORK    10    /* Do not inherit across fork.  */
097: # define MADV_DOFORK      11    /* Do inherit across fork.  */
098: # define MADV_MERGEABLE   12    /* KSM may merge identical pages.  */
099: # define MADV_UNMERGEABLE 13    /* KSM may not merge identical pages.  */
100: # define MADV_HUGEPAGE    14    /* Worth backing with hugepages.  */
101: # define MADV_NOHUGEPAGE  15    /* Not worth backing with hugepages.  */
102: # define MADV_HWPOISON    100   /* Poison a page for testing.  */
103: #endif
104: 
105: /* The POSIX people had to invent similar names for the same things.  */
106: #ifdef __USE_XOPEN2K
107: # define POSIX_MADV_NORMAL      0 /* No further special treatment.  */
108: # define POSIX_MADV_RANDOM      1 /* Expect random page references.  */
109: # define POSIX_MADV_SEQUENTIAL  2 /* Expect sequential page references.  */
110: # define POSIX_MADV_WILLNEED    3 /* Will need these pages.  */
111: # define POSIX_MADV_DONTNEED    4 /* Don't need these pages.  */
112: #endif
113: 

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