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/* $NetBSD: endian.h,v 1.16 1995/06/01 17:19:18 mycroft Exp $ */
/*
* Copyright (c) 1995 Charles M. Hannum. All rights reserved.
* Copyright (c) 1987, 1991 Regents of the University of California.
* All rights reserved.
*
* 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 University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)endian.h 7.8 (Berkeley) 4/3/91
*/
#ifndef _I386_ENDIAN_H_
#define _I386_ENDIAN_H_
/*
* Define the order of 32-bit words in 64-bit words.
*/
#define _QUAD_HIGHWORD 1
#define _QUAD_LOWWORD 0
#ifndef _POSIX_SOURCE
/*
* Definitions for byte order, according to byte significance from low
* address to high.
*/
#define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
#define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
#define BYTE_ORDER LITTLE_ENDIAN
#include <sys/cdefs.h>
__BEGIN_DECLS
unsigned long htonl __P((unsigned long));
unsigned short htons __P((unsigned short));
unsigned long ntohl __P((unsigned long));
unsigned short ntohs __P((unsigned short));
__END_DECLS
#ifdef __GNUC__
#if defined(_KERNEL) && !defined(I386_CPU)
#define __byte_swap_long_variable(x) \
({ register unsigned long __x = (x); \
__asm ("bswap %1" \
: "=r" (__x) \
: "0" (__x)); \
__x; })
#else
#define __byte_swap_long_variable(x) \
({ register unsigned long __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) \
({ register unsigned short __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__ */
#define ntohl(x) __byte_swap_long(x)
#define ntohs(x) __byte_swap_word(x)
#define htonl(x) __byte_swap_long(x)
#define htons(x) __byte_swap_word(x)
#endif /* __GNUC__ */
/*
* Macros for network/external number representation conversion.
*/
#define NTOHL(x) (x) = ntohl((unsigned long)(x))
#define NTOHS(x) (x) = ntohs((unsigned short)(x))
#define HTONL(x) (x) = htonl((unsigned long)(x))
#define HTONS(x) (x) = htons((unsigned short)(x))
#endif /* _POSIX_SOURCE */
#endif /* !_I386_ENDIAN_H_ */
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