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 #define drm_export __attribute__((visibility("default")))
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 #include <sys/mman.h>
44
45 #if defined(ANDROID) && !defined(__LP64__)
46 #include <errno.h> /* for EINVAL */
47
48 extern "C" void *__mmap2(void *, size_t, int, int, int, size_t);
49
drm_mmap(void * addr,size_t length,int prot,int flags,int fd,loff_t offset)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 #else
66
67 /* assume large file support exists */
68 # define drm_mmap(addr, length, prot, flags, fd, offset) \
69 mmap(addr, length, prot, flags, fd, offset)
70
drm_munmap(void * addr,size_t length)71 static inline int drm_munmap(void *addr, size_t length)
72 {
73 /* Copied from configure code generated by AC_SYS_LARGEFILE */
74 #define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
75 (((off_t) 1 << 31) << 31))
76 STATIC_ASSERT(LARGE_OFF_T % 2147483629 == 721 &&
77 LARGE_OFF_T % 2147483647 == 1);
78 #undef LARGE_OFF_T
79
80 return munmap(addr, length);
81 }
82 #endif
83
84 #endif
85