NetBSD/sys/arch/vax/include/endian.h

/*	$NetBSD: endian.h,v 1.6 1995/08/21 16:36:32 ragge Exp $	*/

/*
 * 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 _VAX_ENDIAN_H_
#define _VAX_ENDIAN_H_

#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__

#define	__byte_swap_long_variable(x)		\
({ register unsigned long __y, __x = (x);	\
						\
	__asm ("rotl	$-8, %1, %0;   		\
		insv	%0, $16, $8, %0;	\
		rotl	$8, %1, r1; 		\
		movb	r1, %0"			\
		: "&=r" (__y)			\
		: "r" (__x)			\
		: "r1", "cc" );			\
	__y; })

#define __byte_swap_word_variable(x)		\
({ register unsigned short __y, __x = (x);	\
						\
	__asm ("rotl	$8, %1, %0;		\
		rotl	$-8, %1, r1;		\
		movb	r1, %0;			\
		movzwl	%0, %0"			\
		: "&=r" (__y)			\
		: "r" (__x)			\
		: "r1", "cc" );			\
	__y; })


#define __byte_swap_long(x)     __byte_swap_long_variable(x)
#define __byte_swap_word(x)     __byte_swap_word_variable(x)

#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 long)(x))
#define HTONL(x)        (x) = htonl((unsigned long)(x))
#define HTONS(x)        (x) = htons((unsigned long)(x))

#endif	/* _POSIX_SOURCE */

#endif /* _VAX_ENDIAN_H_ */