NetBSD/sys/arch/i386/include/byte_swap.h

94 lines
3.4 KiB
C

/* $NetBSD: byte_swap.h,v 1.2 2000/03/16 14:15:26 mycroft 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_
#if defined(_KERNEL) && !defined(_LKM)
#include "opt_cputype.h"
#endif
#if defined(_KERNEL) && !defined(_LKM) && !defined(I386_CPU)
#define __byte_swap_long_variable(x) __extension__ \
({ register in_addr_t __x = (x); \
__asm ("bswap %1" \
: "=r" (__x) \
: "0" (__x)); \
__x; })
#else
#define __byte_swap_long_variable(x) __extension__ \
({ register in_addr_t __x = (x); \
__asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \
: "=r" (__x) \
: "0" (__x)); \
__x; })
#endif /* _KERNEL && ... */
#define __byte_swap_word_variable(x) __extension__ \
({ register in_port_t __x = (x); \
__asm ("rorw $8, %w1" \
: "=r" (__x) \
: "0" (__x)); \
__x; })
#ifdef __OPTIMIZE__
#define __byte_swap_long_constant(x) \
((((x) & 0xff000000) >> 24) | \
(((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | \
(((x) & 0x000000ff) << 24))
#define __byte_swap_word_constant(x) \
((((x) & 0xff00) >> 8) | \
(((x) & 0x00ff) << 8))
#define __byte_swap_long(x) \
(__builtin_constant_p((x)) ? \
__byte_swap_long_constant(x) : __byte_swap_long_variable(x))
#define __byte_swap_word(x) \
(__builtin_constant_p((x)) ? \
__byte_swap_word_constant(x) : __byte_swap_word_variable(x))
#else /* __OPTIMIZE__ */
#define __byte_swap_long(x) __byte_swap_long_variable(x)
#define __byte_swap_word(x) __byte_swap_word_variable(x)
#endif /* __OPTIMIZE__ */
#endif /* !_I386_BYTE_SWAP_H_ */