49 lines
2.2 KiB
C
49 lines
2.2 KiB
C
/* byteorder.h - Byte order helpers */
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/*
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* Copyright (c) 2015, Intel Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define sys_le16_to_cpu(val) (val)
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#define sys_cpu_to_le16(val) (val)
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#define sys_le32_to_cpu(val) (val)
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#define sys_cpu_to_le32(val) (val)
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#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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#define bswap_16(x) ((uint16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
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#define sys_le16_to_cpu(val) bswap_16(val)
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#define sys_cpu_to_le16(val) bswap_16(val)
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#define bswap_32(x) ((uint32_t) ((((x) >> 24) & 0xff) | (((x) >> 8) & 0xff00) \
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| (((x) & 0xff00) << 8) | (((x) & 0xff) << 24)))
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#define sys_le32_to_cpu(val) bswap_32(val)
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#define sys_cpu_to_le32(val) bswap_32(val)
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#else
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#error "Unknown byte order"
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#endif
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