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endian.h revision 1.7 
      1 /*	$NetBSD: endian.h,v 1.7 1996/04/08 18:35:48 ragge Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1987, 1991 Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by the University of
     18  *      California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *      @(#)endian.h    7.8 (Berkeley) 4/3/91
     36  */
     37 
     38 #ifndef _VAX_ENDIAN_H_
     39 #define _VAX_ENDIAN_H_
     40 
     41 #define _QUAD_HIGHWORD  1
     42 #define _QUAD_LOWWORD   0
     43 
     44 #ifndef _POSIX_SOURCE
     45 
     46 /*
     47  * Definitions for byte order, according to byte significance from low
     48  * address to high.
     49  */
     50 #define LITTLE_ENDIAN   1234    /* LSB first: i386, vax */
     51 #define BIG_ENDIAN      4321    /* MSB first: 68000, ibm, net */
     52 #define PDP_ENDIAN      3412    /* LSB first in word, MSW first in long */
     53 
     54 #define BYTE_ORDER      LITTLE_ENDIAN
     55 
     56 #include <sys/cdefs.h>
     57 
     58 __BEGIN_DECLS
     59 unsigned long   htonl __P((unsigned long));
     60 unsigned short  htons __P((unsigned short));
     61 unsigned long   ntohl __P((unsigned long));
     62 unsigned short  ntohs __P((unsigned short));
     63 __END_DECLS
     64 
     65 #ifdef	__GNUC__
     66 
     67 #define	__byte_swap_long_variable(x)		\
     68 ({ register unsigned long __y, __x = (x);	\
     69 						\
     70 	__asm ("rotl	$-8, %1, %0;   		\
     71 		insv	%0, $16, $8, %0;	\
     72 		rotl	$8, %1, r1; 		\
     73 		movb	r1, %0"			\
     74 		: "&=r" (__y)			\
     75 		: "r" (__x)			\
     76 		: "r1", "cc" );			\
     77 	__y; })
     78 
     79 #define __byte_swap_word_variable(x)		\
     80 ({ register unsigned short __y, __x = (x);	\
     81 						\
     82 	__asm ("rotl	$8, %1, %0;		\
     83 		rotl	$-8, %1, r1;		\
     84 		movb	r1, %0;			\
     85 		movzwl	%0, %0"			\
     86 		: "&=r" (__y)			\
     87 		: "r" (__x)			\
     88 		: "r1", "cc" );			\
     89 	__y; })
     90 
     91 
     92 #define __byte_swap_long(x)     __byte_swap_long_variable(x)
     93 #define __byte_swap_word(x)     __byte_swap_word_variable(x)
     94 
     95 #define	ntohl(x)        __byte_swap_long(x)
     96 #define ntohs(x)        __byte_swap_word(x)
     97 #define htonl(x)        __byte_swap_long(x)
     98 #define htons(x)        __byte_swap_word(x)
     99 
    100 #endif /* __GNUC__ */
    101 
    102 /*
    103  * Macros for network/external number representation conversion.
    104  */
    105 #define NTOHL(x)	(x) = ntohl((unsigned long)(x))
    106 #define NTOHS(x)	(x) = ntohs((unsigned long)(x))
    107 #define HTONL(x)	(x) = htonl((unsigned long)(x))
    108 #define HTONS(x)	(x) = htons((unsigned long)(x))
    109 
    110 #endif	/* _POSIX_SOURCE */
    111 
    112 #endif /* _VAX_ENDIAN_H_ */
    113