79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/******************************************************************************
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* Copyright (c) 2011 IBM Corporation
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* All rights reserved.
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* This program and the accompanying materials
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* are made available under the terms of the BSD License
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* which accompanies this distribution, and is available at
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* http://www.opensource.org/licenses/bsd-license.php
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*
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* Contributors:
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* IBM Corporation - initial implementation
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*****************************************************************************/
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/*
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* Common byteorder (endianess) macros
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*/
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#ifndef BYTEORDER_H
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#define BYTEORDER_H
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static inline uint16_t
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bswap_16 (uint16_t x)
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{
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return ((x&0xff00) >> 8) | ((x&0xff) << 8);
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}
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static inline uint32_t
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bswap_32 (uint32_t x)
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{
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return bswap_16(x >> 16) | (bswap_16(x) << 16);
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}
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static inline uint64_t
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bswap_64 (uint64_t x)
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{
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return (uint64_t) bswap_32(x >> 32) | (uint64_t) bswap_32(x) << 32;
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}
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/* gcc defines __BIG_ENDIAN__ on big endian targets */
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#ifdef __BIG_ENDIAN__
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#define cpu_to_be16(x) (x)
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#define cpu_to_be32(x) (x)
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#define cpu_to_be64(x) (x)
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#define be16_to_cpu(x) (x)
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#define be32_to_cpu(x) (x)
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#define be64_to_cpu(x) (x)
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#define le16_to_cpu(x) bswap_16(x)
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#define le32_to_cpu(x) bswap_32(x)
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#define le64_to_cpu(x) bswap_64(x)
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#define cpu_to_le16(x) bswap_16(x)
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#define cpu_to_le32(x) bswap_32(x)
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#define cpu_to_le64(x) bswap_64(x)
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#else
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#define cpu_to_be16(x) bswap_16(x)
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#define cpu_to_be32(x) bswap_32(x)
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#define cpu_to_be64(x) bswap_64(x)
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#define be16_to_cpu(x) bswap_16(x)
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#define be32_to_cpu(x) bswap_32(x)
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#define be64_to_cpu(x) bswap_64(x)
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#define le16_to_cpu(x) (x)
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#define le32_to_cpu(x) (x)
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#define le64_to_cpu(x) (x)
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#define cpu_to_le16(x) (x)
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#define cpu_to_le32(x) (x)
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#define cpu_to_le64(x) (x)
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#endif /* __BIG_ENDIAN__ */
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#endif /* BYTEORDER_H */
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