83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
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/* $NetBSD: byte_swap.h,v 1.8 2008/04/28 20:23:14 martin Exp $ */
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/*-
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* Copyright (c) 1997, 1999, 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum, Neil A. Carson, and Jason R. Thorpe.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE 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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#ifndef _ARM_BYTE_SWAP_H_
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#define _ARM_BYTE_SWAP_H_
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#ifdef __GNUC__
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#include <sys/types.h>
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__BEGIN_DECLS
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#define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
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static __inline uint32_t
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__byte_swap_u32_variable(uint32_t v)
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{
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#ifdef _ARM_ARCH_6
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__asm("rev\t%0, %1" : "=r" (v) : "0" (v));
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#else
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uint32_t t1;
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t1 = v ^ ((v << 16) | (v >> 16));
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t1 &= 0xff00ffffU;
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v = (v >> 8) | (v << 24);
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v ^= (t1 >> 8);
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#endif
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return (v);
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}
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#define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
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static __inline uint16_t
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__byte_swap_u16_variable(uint16_t v)
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{
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#ifdef _ARM_ARCH_6
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__asm("rev16\t%0, %1" : "=r" (v) : "0" (v));
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#elif !defined(__thumb__)
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__asm volatile(
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"mov %0, %1, ror #8\n"
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"orr %0, %0, %0, lsr #16\n"
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"bic %0, %0, %0, lsl #16"
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: "=r" (v)
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: "0" (v));
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#else
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v &= 0xffff;
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v = (v >> 8) | (v << 8);
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#endif
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return (v);
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}
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__END_DECLS
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#endif
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#endif /* _ARM_BYTE_SWAP_H_ */
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