2 * Copyright (c) 1987, 1991 Regents of the University of California.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 * from: @(#)endian.h 7.8 (Berkeley) 4/3/91
34 * $FreeBSD: src/sys/i386/include/endian.h,v 1.18 1999/12/29 04:33:01 peter Exp $
37 #ifndef _MACHINE_ENDIAN_H_
38 #define _MACHINE_ENDIAN_H_
41 * Define the order of 32-bit words in 64-bit words.
43 #define _QUAD_HIGHWORD 1
44 #define _QUAD_LOWWORD 0
49 * Definitions for byte order, according to byte significance from low
52 #define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
53 #define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
54 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
56 #define BYTE_ORDER LITTLE_ENDIAN
59 #include <sys/cdefs.h>
63 unsigned long htonl __P((unsigned long));
64 unsigned short htons __P((unsigned short));
65 unsigned long ntohl __P((unsigned long));
66 unsigned short ntohs __P((unsigned short));
69 #define __word_swap_long(x) \
70 __extension__ ({ register u_long __X = (x); \
71 __asm ("rorl $16, %1" \
76 #if defined(_KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU)
78 #define __byte_swap_long(x) \
79 __extension__ ({ register u_long __X = (x); \
86 #define __byte_swap_long(x) \
87 __extension__ ({ register u_long __X = (x); \
88 __asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \
94 #define __byte_swap_word(x) \
95 __extension__ ({ register u_short __X = (x); \
96 __asm ("xchgb %h1, %b1" \
102 * Macros for network/external number representation conversion.
105 #define ntohl __byte_swap_long
106 #define ntohs __byte_swap_word
107 #define htonl __byte_swap_long
108 #define htons __byte_swap_word
111 #define NTOHL(x) ((x) = ntohl((u_long)(x)))
112 #define NTOHS(x) ((x) = ntohs((u_short)(x)))
113 #define HTONL(x) ((x) = htonl((u_long)(x)))
114 #define HTONS(x) ((x) = htons((u_short)(x)))
116 #endif /* ! _POSIX_SOURCE */
118 #endif /* !_MACHINE_ENDIAN_H_ */