src/gallium/auxiliary/os/os_mman.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2011 LunarG, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * @file
  30  * OS independent memory mapping (with large file support).
  31  *
  32  * @author Chia-I Wu <olvaffe@gmail.com>
  33  */
  34
  35 #ifndef _OS_MMAN_H_
  36 #define _OS_MMAN_H_
  37
  38
  39 #include "pipe/p_config.h"
  40 #include "pipe/p_compiler.h"
  41
  42 #if defined(PIPE_OS_UNIX)
  43 #  include <sys/mman.h>
  44 #else
  45 #  error Unsupported OS
  46 #endif
  47
  48 #if defined(PIPE_OS_ANDROID)
  49 #  include <errno.h> /* for EINVAL */
  50 #endif
  51
  52 #ifdef  __cplusplus
  53 extern "C" {
  54 #endif
  55
  56
  57 #if defined(PIPE_OS_ANDROID) && !defined(__LP64__)
  58
  59 extern void *__mmap2(void *, size_t, int, int, int, size_t);
  60
  61 static inline void *os_mmap(void *addr, size_t length, int prot, int flags,
  62                             int fd, loff_t offset)
  63 {
  64    /* offset must be aligned to 4096 (not necessarily the page size) */
  65    if (unlikely(offset & 4095)) {
  66       errno = EINVAL;
  67       return MAP_FAILED;
  68    }
  69
  70    return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
  71 }
  72
  73 #  define os_munmap(addr, length) \
  74              munmap(addr, length)
  75
  76 #else
  77 /* assume large file support exists */
  78 #  define os_mmap(addr, length, prot, flags, fd, offset) \
  79              mmap(addr, length, prot, flags, fd, offset)
  80
  81 static inline int os_munmap(void *addr, size_t length)
  82 {
  83    /* Copied from configure code generated by AC_SYS_LARGEFILE */
  84 #define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
  85                      (((off_t) 1 << 31) << 31))
  86    STATIC_ASSERT(LARGE_OFF_T % 2147483629 == 721 &&
  87                  LARGE_OFF_T % 2147483647 == 1);
  88 #undef LARGE_OFF_T
  89
  90    return munmap(addr, length);
  91 }
  92 #endif
  93
  94
  95 #ifdef  __cplusplus
  96 }
  97 #endif
  98
  99 #endif /* _OS_MMAN_H_ */