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 HAVE_VISIBILITY
27 # define drm_private __attribute__((visibility("hidden")))
28 # define drm_public __attribute__((visibility("default")))
29 #else
30 # define drm_private
31 # define drm_public
32 #endif
33
34
35 /**
36 * Static (compile-time) assertion.
37 * Basically, use COND to dimension an array. If COND is false/zero the
38 * array size will be -1 and we'll get a compilation error.
39 */
40 #define STATIC_ASSERT(COND) \
41 do { \
42 (void) sizeof(char [1 - 2*!(COND)]); \
43 } while (0)
44
45
46 #include <sys/mman.h>
47
48 #if defined(ANDROID) && !defined(__LP64__)
49 #include <errno.h> /* for EINVAL */
50
drm_mmap(void * addr,size_t length,int prot,int flags,int fd,loff_t offset)51 static inline void *drm_mmap(void *addr, size_t length, int prot, int flags,
52 int fd, loff_t offset)
53 {
54 /* offset must be aligned to 4096 (not necessarily the page size) */
55 if (offset & 4095) {
56 errno = EINVAL;
57 return MAP_FAILED;
58 }
59
60 return mmap64(addr, length, prot, flags, fd, offset);
61 }
62
63 # define drm_munmap(addr, length) \
64 munmap(addr, length)
65
66
67 #else
68
69 /* assume large file support exists */
70 # define drm_mmap(addr, length, prot, flags, fd, offset) \
71 mmap(addr, length, prot, flags, fd, offset)
72
73
drm_munmap(void * addr,size_t length)74 static inline int drm_munmap(void *addr, size_t length)
75 {
76 /* Copied from configure code generated by AC_SYS_LARGEFILE */
77 #define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
78 (((off_t) 1 << 31) << 31))
79 STATIC_ASSERT(LARGE_OFF_T % 2147483629 == 721 &&
80 LARGE_OFF_T % 2147483647 == 1);
81 #undef LARGE_OFF_T
82
83 return munmap(addr, length);
84 }
85 #endif
86
87 #endif
88