src/mesa/drivers/dri/i965/libdrm_macros.h

   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 #include "util/macros.h"
  27
  28
  29 #include <sys/mman.h>
  30
  31 #if defined(ANDROID) && !defined(__LP64__)
  32 #include <errno.h> /* for EINVAL */
  33
  34 extern void *__mmap2(void *, size_t, int, int, int, size_t);
  35
  36 static inline void *drm_mmap(void *addr, size_t length, int prot, int flags,
  37                              int fd, loff_t offset)
  38 {
  39    /* offset must be aligned to 4096 (not necessarily the page size) */
  40    if (offset & 4095) {
  41       errno = EINVAL;
  42       return MAP_FAILED;
  43    }
  44
  45    return __mmap2(addr, length, prot, flags, fd, (size_t) (offset >> 12));
  46 }
  47
  48 #  define drm_munmap(addr, length) \
  49               munmap(addr, length)
  50
  51
  52 #else
  53
  54 /* assume large file support exists */
  55 #  define drm_mmap(addr, length, prot, flags, fd, offset) \
  56               mmap(addr, length, prot, flags, fd, offset)
  57
  58
  59 static inline int drm_munmap(void *addr, size_t length)
  60 {
  61    /* Copied from configure code generated by AC_SYS_LARGEFILE */
  62 #define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
  63                      (((off_t) 1 << 31) << 31))
  64    STATIC_ASSERT(LARGE_OFF_T % 2147483629 == 721 &&
  65                  LARGE_OFF_T % 2147483647 == 1);
  66 #undef LARGE_OFF_T
  67
  68    return munmap(addr, length);
  69 }
  70 #endif
  71
  72 #endif