97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/* $NetBSD: byte_swap.h,v 1.6 2001/11/29 02:46:55 lukem 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
|
|
|
|
|
|
static __inline u_int32_t __byte_swap_long_variable(u_int32_t);
|
|
static __inline u_int16_t __byte_swap_word_variable(u_int16_t);
|
|
|
|
static __inline u_int32_t
|
|
__byte_swap_long_variable(u_int32_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);
|
|
}
|
|
|
|
static __inline u_int16_t
|
|
__byte_swap_word_variable(u_int16_t x)
|
|
{
|
|
__asm __volatile ("rorw $8, %w1" : "=r" (x) : "0" (x));
|
|
return (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_ */
|