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https://git.rtems.org/rtems-libbsd/
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28ee86a9b0
Imported from Freescale Linux repository git://git.freescale.com/ppc/upstream/linux.git commit 2774c204cd8bfc56a200ff4dcdfc9cdf5b6fc161. Linux compatibility layer is partly from FreeBSD.
66 lines
2.0 KiB
C
66 lines
2.0 KiB
C
/*
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* Copyright (c) 2015 embedded brains GmbH
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* All rights reserved.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUX_BITREV_H
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#define _LINUX_BITREV_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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extern const uint8_t bitrev_nibbles[16];
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static inline uint8_t
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bitrev8(uint8_t x)
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{
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return ((bitrev_nibbles[x & 15] << 4) | bitrev_nibbles[x >> 4]);
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}
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static inline uint16_t
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bitrev16(uint16_t x)
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{
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return (uint16_t)((bitrev8((uint8_t)x) << 8) |
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bitrev8((uint8_t)(x >> 8)));
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}
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static inline uint32_t
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bitrev32(uint32_t x)
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{
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return ((((uint32_t)bitrev16((uint16_t)x) << 16)) |
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((uint32_t)bitrev8((uint16_t)(x >> 16))));
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}
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* _LINUX_BITREV_H */
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