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
os_mmap(void * addr,size_t length,int prot,int flags,int fd,loff_t offset)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