/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2002 by Alan Korr * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #ifndef _RBENDIAN_H_ #define _RBENDIAN_H_ #include "config.h" #ifdef OS_USE_BYTESWAP_H #include #endif #ifndef __MINGW32__ #include #endif /* clear these out since we redefine them to be truely constant compatible */ #undef swap16 #undef swap32 #undef swap64 #undef letoh16 #undef letoh32 #undef letoh64 #undef htole16 #undef htole32 #undef htole64 #undef betoh16 #undef betoh32 #undef betoh64 #undef htobe16 #undef htobe32 #undef htobe64 /* static/generic endianness conversion */ #define SWAP16_CONST(x) \ ((typeof(x))( ((uint16_t)(x) >> 8) | ((uint16_t)(x) << 8) )) #define SWAP32_CONST(x) \ ((typeof(x))( (((uint32_t)(x) & 0xff000000) >> 24) | \ (((uint32_t)(x) & 0x00ff0000) >> 8) | \ (((uint32_t)(x) & 0x0000ff00) << 8) | \ (((uint32_t)(x) & 0x000000ff) << 24) )) #define SWAP64_CONST(x) \ ((typeof(x))( (((uint64_t)(x) & 0xff00000000000000ull) >> 56) | \ (((uint64_t)(x) & 0x00ff000000000000ull) >> 40) | \ (((uint64_t)(x) & 0x0000ff0000000000ull) >> 24) | \ (((uint64_t)(x) & 0x000000ff00000000ull) >> 8) | \ (((uint64_t)(x) & 0x00000000ff000000ull) << 8) | \ (((uint64_t)(x) & 0x0000000000ff0000ull) << 24) | \ (((uint64_t)(x) & 0x000000000000ff00ull) << 40) | \ (((uint64_t)(x) & 0x00000000000000ffull) << 56) )) #define SWAP_ODD_EVEN32_CONST(x) \ ((typeof(x))( ((uint32_t)SWAP16_CONST((uint32_t)(x) >> 16) << 16) | \ SWAP16_CONST((uint32_t)(x))) ) #define SWAW32_CONST(x) \ ((typeof(x))( ((uint32_t)(x) << 16) | ((uint32_t)(x) >> 16) )) #ifndef __ENDIAN_H_NATIVE_RB #if defined (__bswap_16) #define __swap16_os(x) __bswap_16(x) #define __swap32_os(x) __bswap_32(x) #define __swap64_os(x) __bswap_64(x) #elif defined (bswap_16) #define __swap16_os(x) bswap_16(x) #define __swap32_os(x) bswap_32(x) #define __swap64_os(x) bswap_64(x) #elif defined (__swap16) #define __swap16_os(x) __swap16(x) #define __swap32_os(x) __swap32(x) #define __swap64_os(x) __swap64(x) #elif defined (swap16) #define __swap16_os(x) swap16(x) #define __swap32_os(x) swap32(x) #define __swap64_os(x) swap64(x) #else /* kinda hacky but works */ #define __swap16_os(x) SWAP16_CONST(x) #define __swap32_os(x) SWAP32_CONST(x) #define __swap64_os(x) SWAP64_CONST(x) #endif /* wrap these because they aren't always compatible with compound initializers */ static FORCE_INLINE uint16_t swap16_hw(uint16_t x) { return __swap16_os(x); } static FORCE_INLINE uint32_t swap32_hw(uint32_t x) { return __swap32_os(x); } static FORCE_INLINE uint64_t swap64_hw(uint64_t x) { return __swap64_os(x); } #endif /* __ENDIAN_H_NATIVE_RB */ #if defined(NEED_GENERIC_BYTESWAPS) || !defined(__ENDIAN_H_NATIVE_RB) /* these are uniquely ours it seems */ static inline uint32_t swap_odd_even32_hw(uint32_t value) /* * result[31..24],[15.. 8] = value[23..16],[ 7.. 0] * result[23..16],[ 7.. 0] = value[31..24],[15.. 8] */ { uint32_t t = value & 0xff00ff00; return (t >> 8) | ((t ^ value) << 8); } static inline uint32_t swaw32_hw(uint32_t value) /* * result[31..16] = value[15.. 0]; * result[15.. 0] = value[31..16]; */ { return (value >> 16) | (value << 16); } #endif /* Generic */ /* select best method based upon whether x is a constant expression */ #define swap16(x) \ ( __builtin_constant_p(x) ? SWAP16_CONST(x) : (typeof(x))swap16_hw(x) ) #define swap32(x) \ ( __builtin_constant_p(x) ? SWAP32_CONST(x) : (typeof(x))swap32_hw(x) ) #define swap64(x) \ ( __builtin_constant_p(x) ? SWAP64_CONST(x) : (typeof(x))swap64_hw(x) ) #define swap_odd_even32(x) \ ( __builtin_constant_p(x) ? SWAP_ODD_EVEN32_CONST(x) : (typeof(x))swap_odd_even32_hw(x) ) #define swaw32(x) \ ( __builtin_constant_p(x) ? SWAW32_CONST(x) : (typeof(x))swaw32_hw(x) ) #if defined(ROCKBOX_LITTLE_ENDIAN) #define letoh16(x) (x) #define letoh32(x) (x) #define letoh64(x) (x) #define htole16(x) (x) #define htole32(x) (x) #define htole64(x) (x) #define betoh16(x) swap16(x) #define betoh32(x) swap32(x) #define betoh64(x) swap64(x) #define htobe16(x) swap16(x) #define htobe32(x) swap32(x) #define htobe64(x) swap64(x) #define swap_odd_even_be32(x) (x) #define swap_odd_even_le32(x) swap_odd_even32(x) #elif defined(ROCKBOX_BIG_ENDIAN) #define letoh16(x) swap16(x) #define letoh32(x) swap32(x) #define letoh64(x) swap64(x) #define htole16(x) swap16(x) #define htole32(x) swap32(x) #define htole64(x) swap64(x) #define betoh16(x) (x) #define betoh32(x) (x) #define betoh64(x) (x) #define htobe16(x) (x) #define htobe32(x) (x) #define htobe64(x) (x) #define swap_odd_even_be32(x) swap_odd_even32(x) #define swap_odd_even_le32(x) (x) #else #error "Unknown endianness!" #endif #endif /* _RBENDIAN_H_ */