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endian.h revision 1.5 
      1 /*
      2  * Copyright (c) 1987, 1991 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	from: @(#)endian.h	7.8 (Berkeley) 4/3/91
     34  *	$Id: endian.h,v 1.5 1993/09/16 02:25:45 mycroft Exp $
     35  */
     36 
     37 /*
     38  * Define the order of 32-bit words in 64-bit words.
     39  */
     40 #define _QUAD_HIGHWORD 1
     41 #define _QUAD_LOWWORD 0
     42 
     43 /*
     44  * Definitions for byte order, according to byte significance from low
     45  * address to high.
     46  */
     47 #define	LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
     48 #define	BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
     49 #define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
     50 
     51 #define	BYTE_ORDER	LITTLE_ENDIAN
     52 
     53 #ifndef KERNEL
     54 #include <sys/cdefs.h>
     55 #endif
     56 
     57 __BEGIN_DECLS
     58 unsigned long   htonl __P((unsigned long));
     59 unsigned short  htons __P((unsigned short));
     60 unsigned long   ntohl __P((unsigned long));
     61 unsigned short  ntohs __P((unsigned short));
     62 __END_DECLS
     63 
     64 
     65 #if __GNUC__
     66 #if __GNUC__ >= 2
     67 #if defined(KERNEL) && ((defined(I486_CPU) || defined(I586_CPU)) && !defined(I386_CPU))
     68 #define __byte_swap_long(x) \
     69 ({ register unsigned long X = (x); \
     70    asm ("bswap %1" \
     71 	: "=q" (X) \
     72 	: "0" (X)); \
     73    X; })
     74 #else
     75 #define __byte_swap_long(x) \
     76 ({ register unsigned long X = (x); \
     77    asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \
     78 	: "=q" (X) \
     79 	: "0" (X)); \
     80    X; })
     81 #endif	/* KERNEL && ... */
     82 #define __byte_swap_word(x) \
     83 ({ register unsigned short X = (x); \
     84    asm ("xchgb %h1, %b1" \
     85 	: "=q" (X) \
     86 	: "0" (X)); \
     87    X; })
     88 #else	/* __GNUC__ >= 2 */
     89 #if defined(KERNEL) && ((defined(I486_CPU) || defined(I586_CPU)) && !defined(I386_CPU))
     90 #define __byte_swap_long(x) \
     91 ({ register unsigned long X = (x); \
     92    asm ("bswap %1" \
     93 	: "=r" (X) \
     94 	: "0" (X)); \
     95    X; })
     96 #else
     97 #define __byte_swap_long(x) \
     98 ({ register u_long X = (x); \
     99    asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \
    100 	: "=r" (X) \
    101 	: "0" (X)); \
    102    X; })
    103 #endif	/* KERNEL && ... */
    104 #define __byte_swap_word(x) \
    105 ({ register u_short X = (x); \
    106    asm ("rorw $8, %w1" \
    107 	: "=r" (X) \
    108 	: "0" (X)); \
    109    X; })
    110 #endif	/* __GNUC__ >= 2 */
    111 
    112 #define	ntohl(x)	__byte_swap_long(x)
    113 #define	ntohs(x)	__byte_swap_word(x)
    114 #define	htonl(x)	__byte_swap_long(x)
    115 #define	htons(x)	__byte_swap_word(x)
    116 #endif	/* __GNUC__ */
    117 
    118 
    119 /*
    120  * Macros for network/external number representation conversion.
    121  */
    122 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
    123 #define	ntohl(x)	(x)
    124 #define	ntohs(x)	(x)
    125 #define	htonl(x)	(x)
    126 #define	htons(x)	(x)
    127 
    128 #define	NTOHL(x)	(x)
    129 #define	NTOHS(x)	(x)
    130 #define	HTONL(x)	(x)
    131 #define	HTONS(x)	(x)
    132 
    133 #else
    134 
    135 #define	NTOHL(x)	(x) = ntohl((u_long)x)
    136 #define	NTOHS(x)	(x) = ntohs((u_short)x)
    137 #define	HTONL(x)	(x) = htonl((u_long)x)
    138 #define	HTONS(x)	(x) = htons((u_short)x)
    139 #endif
    140