include/qemu/madvise.h

   1 /*
   2  * QEMU madvise wrapper functions
   3  *
   4  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   5  * See the COPYING file in the top-level directory.
   6  */
   7
   8 #ifndef QEMU_MADVISE_H
   9 #define QEMU_MADVISE_H
  10
  11 #define QEMU_MADV_INVALID -1
  12
  13 #if defined(CONFIG_MADVISE)
  14
  15 #define QEMU_MADV_WILLNEED  MADV_WILLNEED
  16 #define QEMU_MADV_DONTNEED  MADV_DONTNEED
  17 #ifdef MADV_DONTFORK
  18 #define QEMU_MADV_DONTFORK  MADV_DONTFORK
  19 #else
  20 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
  21 #endif
  22 #ifdef MADV_MERGEABLE
  23 #define QEMU_MADV_MERGEABLE MADV_MERGEABLE
  24 #else
  25 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
  26 #endif
  27 #ifdef MADV_UNMERGEABLE
  28 #define QEMU_MADV_UNMERGEABLE MADV_UNMERGEABLE
  29 #else
  30 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
  31 #endif
  32 #ifdef MADV_DODUMP
  33 #define QEMU_MADV_DODUMP MADV_DODUMP
  34 #else
  35 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
  36 #endif
  37 #ifdef MADV_DONTDUMP
  38 #define QEMU_MADV_DONTDUMP MADV_DONTDUMP
  39 #else
  40 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
  41 #endif
  42 #ifdef MADV_HUGEPAGE
  43 #define QEMU_MADV_HUGEPAGE MADV_HUGEPAGE
  44 #else
  45 #define QEMU_MADV_HUGEPAGE QEMU_MADV_INVALID
  46 #endif
  47 #ifdef MADV_NOHUGEPAGE
  48 #define QEMU_MADV_NOHUGEPAGE MADV_NOHUGEPAGE
  49 #else
  50 #define QEMU_MADV_NOHUGEPAGE QEMU_MADV_INVALID
  51 #endif
  52 #ifdef MADV_REMOVE
  53 #define QEMU_MADV_REMOVE MADV_REMOVE
  54 #else
  55 #define QEMU_MADV_REMOVE QEMU_MADV_DONTNEED
  56 #endif
  57 #ifdef MADV_POPULATE_WRITE
  58 #define QEMU_MADV_POPULATE_WRITE MADV_POPULATE_WRITE
  59 #else
  60 #define QEMU_MADV_POPULATE_WRITE QEMU_MADV_INVALID
  61 #endif
  62
  63 #elif defined(CONFIG_POSIX_MADVISE)
  64
  65 #define QEMU_MADV_WILLNEED  POSIX_MADV_WILLNEED
  66 #define QEMU_MADV_DONTNEED  POSIX_MADV_DONTNEED
  67 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
  68 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
  69 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
  70 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
  71 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
  72 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
  73 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
  74 #define QEMU_MADV_REMOVE QEMU_MADV_DONTNEED
  75 #define QEMU_MADV_POPULATE_WRITE QEMU_MADV_INVALID
  76
  77 #else /* no-op */
  78
  79 #define QEMU_MADV_WILLNEED  QEMU_MADV_INVALID
  80 #define QEMU_MADV_DONTNEED  QEMU_MADV_INVALID
  81 #define QEMU_MADV_DONTFORK  QEMU_MADV_INVALID
  82 #define QEMU_MADV_MERGEABLE QEMU_MADV_INVALID
  83 #define QEMU_MADV_UNMERGEABLE QEMU_MADV_INVALID
  84 #define QEMU_MADV_DODUMP QEMU_MADV_INVALID
  85 #define QEMU_MADV_DONTDUMP QEMU_MADV_INVALID
  86 #define QEMU_MADV_HUGEPAGE  QEMU_MADV_INVALID
  87 #define QEMU_MADV_NOHUGEPAGE  QEMU_MADV_INVALID
  88 #define QEMU_MADV_REMOVE QEMU_MADV_INVALID
  89 #define QEMU_MADV_POPULATE_WRITE QEMU_MADV_INVALID
  90
  91 #endif
  92
  93 int qemu_madvise(void *addr, size_t len, int advice);
  94
  95 #endif