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 # 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) 49 #include <errno.h> /* for EINVAL */ 50 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 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
