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/* $NetBSD: byte_swap.h,v 1.10 2006/01/30 22:46:36 dsl Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _I386_BYTE_SWAP_H_
#define _I386_BYTE_SWAP_H_
#include <sys/types.h>
#if defined(_KERNEL_OPT)
#include "opt_cputype.h"
#endif
#ifdef __GNUC__
#include <sys/types.h>
__BEGIN_DECLS
#define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
static __inline uint32_t __byte_swap_u32_variable(uint32_t);
static __inline uint32_t
__byte_swap_u32_variable(uint32_t x)
{
__asm volatile (
#if defined(_KERNEL) && !defined(_LKM) && !defined(I386_CPU)
"bswap %1"
#else
"rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1"
#endif
: "=r" (x) : "0" (x));
return (x);
}
#define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
static __inline uint16_t __byte_swap_u16_variable(uint16_t);
static __inline uint16_t
__byte_swap_u16_variable(uint16_t x)
{
__asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x));
return (x);
}
__END_DECLS
#endif
#endif /* !_I386_BYTE_SWAP_H_ */
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