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  1. /*
  2.  * Copyright © 2014 NVIDIA Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice shall be included in
  12.  * all copies or substantial portions of the Software.
  13.  *
  14.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17.  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18.  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19.  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20.  * OTHER DEALINGS IN THE SOFTWARE.
  21.  */
  22.  
  23. #ifndef LIBDRM_LIBDRM_H
  24. #define LIBDRM_LIBDRM_H
  25.  
  26. #if defined(HAVE_VISIBILITY)
  27. #  define drm_private __attribute__((visibility("hidden")))
  28. #else
  29. #  define drm_private
  30. #endif
  31.  
  32.  
  33. /**
  34.  * Static (compile-time) assertion.
  35.  * Basically, use COND to dimension an array.  If COND is false/zero the
  36.  * array size will be -1 and we'll get a compilation error.
  37.  */
  38. #define STATIC_ASSERT(COND) \
  39.    do { \
  40.       (void) sizeof(char [1 - 2*!(COND)]); \
  41.    } while (0)
  42.  
  43.  
  44.  
  45. #if defined(ANDROID) && !defined(__LP64__)
  46. #include <errno.h> /* for EINVAL */
  47.  
  48. extern void *__mmap2(void *, size_t, int, int, int, size_t);
  49.  
  50. static inline void *drm_mmap(void *addr, size_t length, int prot, int flags,
  51.                              int fd, loff_t offset)
  52. {
  53.    /* offset must be aligned to 4096 (not necessarily the page size) */
  54.    if (offset & 4095) {
  55.       errno = EINVAL;
  56.       return MAP_FAILED;
  57.    }
  58.  
  59.    return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
  60. }
  61.  
  62. #  define drm_munmap(addr, length) \
  63.               munmap(addr, length)
  64.  
  65.  
  66. #else
  67.  
  68. #endif
  69.  
  70. #endif
  71.