99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/* $NetBSD: byte_swap.h,v 1.2 2002/08/14 15:08:58 thorpej 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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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#include <sys/types.h>
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static __inline u_int32_t
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__byte_swap_32_variable(u_int32_t v)
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{
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u_int32_t t1;
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t1 = v ^ ((v << 16) | (v >> 16));
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t1 &= 0xff00ffff;
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v = (v >> 8) | (v << 24);
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v ^= (t1 >> 8);
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return (v);
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}
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static __inline u_int16_t
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__byte_swap_16_variable(u_int16_t v)
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{
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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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return (v);
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}
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#ifdef __OPTIMIZE__
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#define __byte_swap_32_constant(x) \
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((((x) & 0xff000000) >> 24) | \
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(((x) & 0x00ff0000) >> 8) | \
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(((x) & 0x0000ff00) << 8) | \
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(((x) & 0x000000ff) << 24))
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#define __byte_swap_16_constant(x) \
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((((x) & 0xff00) >> 8) | \
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(((x) & 0x00ff) << 8))
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#define __byte_swap_32(x) \
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(__builtin_constant_p((x)) ? \
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__byte_swap_32_constant(x) : __byte_swap_32_variable(x))
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#define __byte_swap_16(x) \
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(__builtin_constant_p((x)) ? \
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__byte_swap_16_constant(x) : __byte_swap_16_variable(x))
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#else
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#define __byte_swap_32(x) __byte_swap_32_variable(x)
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#define __byte_swap_16(x) __byte_swap_16_variable(x)
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#endif /* __OPTIMIZE__ */
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#endif /* _ARM_BYTE_SWAP_H_ */
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