1 /* 2 * Copyright 2003-2008, Axel Dörfler, axeld@pinc-software.de. 3 * Distributed under the terms of the MIT License. 4 */ 5 #ifndef BFS_ENDIAN_H 6 #define BFS_ENDIAN_H 7 8 9 #include "system_dependencies.h" 10 11 12 #if !defined(BFS_LITTLE_ENDIAN_ONLY) && !defined(BFS_BIG_ENDIAN_ONLY) 13 // default setting; BFS is now primarily a little endian file system 14 # define BFS_LITTLE_ENDIAN_ONLY 15 #endif 16 #if defined(BFS_LITTLE_ENDIAN_ONLY) && defined(BFS_BIG_ENDIAN_ONLY) 17 # error Building BFS with both big and little endian is not supported. 18 #endif 19 20 21 #if defined(BFS_LITTLE_ENDIAN_ONLY) && B_HOST_IS_LENDIAN \ 22 || defined(BFS_BIG_ENDIAN_ONLY) && B_HOST_IS_BENDIAN 23 /* host is BFS endian */ 24 # define BFS_NATIVE_ENDIAN 25 # define BFS_ENDIAN_TO_HOST_INT16(value) (value) 26 # define BFS_ENDIAN_TO_HOST_INT32(value) (value) 27 # define BFS_ENDIAN_TO_HOST_INT64(value) (value) 28 # define HOST_ENDIAN_TO_BFS_INT16(value) (value) 29 # define HOST_ENDIAN_TO_BFS_INT32(value) (value) 30 # define HOST_ENDIAN_TO_BFS_INT64(value) (value) 31 #elif defined(BFS_LITTLE_ENDIAN_ONLY) && B_HOST_IS_BENDIAN \ 32 || defined(BFS_BIG_ENDIAN_ONLY) && B_HOST_IS_LENDIAN 33 /* host is big endian, BFS is little endian or vice versa */ 34 # define BFS_ENDIAN_TO_HOST_INT16(value) __swap_int16(value) 35 # define BFS_ENDIAN_TO_HOST_INT32(value) __swap_int32(value) 36 # define BFS_ENDIAN_TO_HOST_INT64(value) __swap_int64(value) 37 # define HOST_ENDIAN_TO_BFS_INT16(value) __swap_int16(value) 38 # define HOST_ENDIAN_TO_BFS_INT32(value) __swap_int32(value) 39 # define HOST_ENDIAN_TO_BFS_INT64(value) __swap_int64(value) 40 #else 41 // TODO: maybe build a version that supports both, big & little endian? 42 // But since that will need some kind of global data (to 43 // know of what type this file system is), it's probably 44 // something for the boot loader; anything else would be 45 // a major pain. 46 #endif 47 48 #endif /* BFS_ENDIAN_H */ 49