sysdeps/unix/sysv/linux/alpha/bits/mman.h

   1 /* Definitions for POSIX memory map interface.  Linux/Alpha version.
   2    Copyright (C) 1997-2012 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library.  If not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _SYS_MMAN_H
  20 # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
  21 #endif
  22
  23 /* The following definitions basically come from the kernel headers.
  24    But the kernel header is not namespace clean.  */
  25
  26
  27 /* Protections are chosen from these bits, OR'd together.  The
  28    implementation does not necessarily support PROT_EXEC or PROT_WRITE
  29    without PROT_READ.  The only guarantees are that no writing will be
  30    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
  31
  32 #define PROT_READ         0x1           /* Page can be read.  */
  33 #define PROT_WRITE        0x2           /* Page can be written.  */
  34 #define PROT_EXEC         0x4           /* Page can be executed.  */
  35 #define PROT_NONE         0x0           /* Page can not be accessed.  */
  36 #define PROT_GROWSDOWN    0x01000000    /* Extend change to start of
  37                                            growsdown vma (mprotect only).  */
  38 #define PROT_GROWSUP      0x02000000    /* Extend change to start of
  39                                            growsup vma (mprotect only).  */
  40
  41 /* Sharing types (must choose one and only one of these).  */
  42 #define MAP_SHARED        0x01          /* Share changes.  */
  43 #define MAP_PRIVATE       0x02          /* Changes are private.  */
  44 #ifdef __USE_MISC
  45 # define MAP_TYPE         0x0f          /* Mask for type of mapping.  */
  46 #endif
  47
  48 /* Other flags.  */
  49 #define MAP_FIXED         0x100         /* Interpret addr exactly.  */
  50 #ifdef __USE_MISC
  51 # define MAP_FILE         0
  52 # define MAP_ANONYMOUS    0x10          /* Don't use a file.  */
  53 # define MAP_ANON         MAP_ANONYMOUS
  54 #endif
  55
  56 /* Not used by Linux, but here to make sure we don't clash with
  57    OSF/1 defines.  */
  58 #if 0 && defined __USE_BSD
  59 # define MAP_HASSEMAPHORE 0x0200
  60 # define MAP_INHERIT      0x0400
  61 # define MAP_UNALIGNED    0x0800
  62 #endif
  63
  64 /* These are Linux-specific.  */
  65 #ifdef __USE_MISC
  66 # define MAP_GROWSDOWN    0x01000       /* Stack-like segment.  */
  67 # define MAP_DENYWRITE    0x02000       /* ETXTBSY */
  68 # define MAP_EXECUTABLE   0x04000       /* Mark it as an executable.  */
  69 # define MAP_LOCKED       0x08000       /* Lock the mapping.  */
  70 # define MAP_NORESERVE    0x10000       /* Don't check for reservations.  */
  71 # define MAP_POPULATE     0x20000       /* Populate (prefault) pagetables.  */
  72 # define MAP_NONBLOCK     0x40000       /* Do not block on IO.  */
  73 # define MAP_STACK        0x80000       /* Allocation is for a stack.  */
  74 # define MAP_HUGETLB      0x100000      /* Create huge page mapping.  */
  75 #endif
  76
  77 /* Flags to `msync'.  */
  78 #define MS_ASYNC          1             /* Sync memory asynchronously.  */
  79 #define MS_SYNC           2             /* Synchronous memory sync.  */
  80 #define MS_INVALIDATE     4             /* Invalidate the caches.  */
  81
  82 /* Flags for `mlockall'.  */
  83 #define MCL_CURRENT       8192          /* Lock all currently mapped pages.  */
  84 #define MCL_FUTURE        16384         /* Lock all additions to address
  85                                            space.  */
  86
  87 /* Flags for `mremap'.  */
  88 #ifdef __USE_GNU
  89 # define MREMAP_MAYMOVE 1
  90 # define MREMAP_FIXED   2
  91 #endif
  92
  93 /* Advice to `madvise'.  */
  94 #ifdef __USE_BSD
  95 # define MADV_NORMAL      0  /* No further special treatment.  */
  96 # define MADV_RANDOM      1  /* Expect random page references.  */
  97 # define MADV_SEQUENTIAL  2  /* Expect sequential page references.  */
  98 # define MADV_WILLNEED    3  /* Will need these pages.  */
  99 # define MADV_DONTNEED    6  /* Don't need these pages.  */
 100 # define MADV_REMOVE      9  /* Remove these pages and resources.  */
 101 # define MADV_DONTFORK    10 /* Do not inherit across fork.  */
 102 # define MADV_DOFORK      11 /* Do inherit across fork.  */
 103 # define MADV_MERGEABLE   12 /* KSM may merge identical pages.  */
 104 # define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages.  */
 105 # define MADV_HUGEPAGE    14 /* Worth backing with hugepages.  */
 106 # define MADV_NOHUGEPAGE  15 /* Not worth backing with hugepages.  */
 107 # define MADV_DONTDUMP    16 /* Exclude from the core dump.  */
 108 # define MADV_DODUMP      17 /* Clear MADV_DONTDUMP.  */
 109 # define MADV_HWPOISON   100 /* Poison a page for testing.  */
 110 #endif
 111
 112 /* The POSIX people had to invent similar names for the same things.  */
 113 #ifdef __USE_XOPEN2K
 114 # define POSIX_MADV_NORMAL      0 /* No further special treatment.  */
 115 # define POSIX_MADV_RANDOM      1 /* Expect random page references.  */
 116 # define POSIX_MADV_SEQUENTIAL  2 /* Expect sequential page references.  */
 117 # define POSIX_MADV_WILLNEED    3 /* Will need these pages.  */
 118 # define POSIX_MADV_DONTNEED    6 /* Don't need these pages.  */
 119 #endif
 120
 121 /* Not used by Linux, but here to make sure we don't clash with
 122    OSF/1 defines.  */
 123 #if 0 && defined __USE_BSD
 124 # define MADV_DONTNEED_COMPAT 4 /* Old version?  */
 125 # define MADV_SPACEAVAIL 5      /* Ensure resources are available.  */
 126 #endif