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  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_ */
  100.