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