what the heck one last one before i go take a nap...
[dragonfly.git] / sys / i386 / include / endian.h
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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 * $FreeBSD: src/sys/i386/include/endian.h,v 1.18 1999/12/29 04:33:01 peter Exp $
3ae0cd58 35 * $DragonFly: src/sys/i386/include/Attic/endian.h,v 1.3 2003/08/26 21:42:18 rob Exp $
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36 */
37
38#ifndef _MACHINE_ENDIAN_H_
39#define _MACHINE_ENDIAN_H_
40
41/*
42 * Define the order of 32-bit words in 64-bit words.
43 */
44#define _QUAD_HIGHWORD 1
45#define _QUAD_LOWWORD 0
46
47#ifndef _POSIX_SOURCE
48
49/*
50 * Definitions for byte order, according to byte significance from low
51 * address to high.
52 */
53#define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
54#define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
55#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
56
57#define BYTE_ORDER LITTLE_ENDIAN
58
59#ifndef _KERNEL
60#include <sys/cdefs.h>
61#endif
62
63__BEGIN_DECLS
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64unsigned long htonl (unsigned long);
65unsigned short htons (unsigned short);
66unsigned long ntohl (unsigned long);
67unsigned short ntohs (unsigned short);
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68__END_DECLS
69
70#define __word_swap_long(x) \
71__extension__ ({ register u_long __X = (x); \
72 __asm ("rorl $16, %1" \
73 : "=r" (__X) \
74 : "0" (__X)); \
75 __X; })
76
77#if defined(_KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU)
78
79#define __byte_swap_long(x) \
80__extension__ ({ register u_long __X = (x); \
81 __asm ("bswap %0" \
82 : "=r" (__X) \
83 : "0" (__X)); \
84 __X; })
85#else
86
87#define __byte_swap_long(x) \
88__extension__ ({ register u_long __X = (x); \
89 __asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \
90 : "=q" (__X) \
91 : "0" (__X)); \
92 __X; })
93#endif
94
95#define __byte_swap_word(x) \
96__extension__ ({ register u_short __X = (x); \
97 __asm ("xchgb %h1, %b1" \
98 : "=q" (__X) \
99 : "0" (__X)); \
100 __X; })
101
102/*
103 * Macros for network/external number representation conversion.
104 */
105#ifdef __GNUC__
106#define ntohl __byte_swap_long
107#define ntohs __byte_swap_word
108#define htonl __byte_swap_long
109#define htons __byte_swap_word
110#endif
111
112#define NTOHL(x) ((x) = ntohl((u_long)(x)))
113#define NTOHS(x) ((x) = ntohs((u_short)(x)))
114#define HTONL(x) ((x) = htonl((u_long)(x)))
115#define HTONS(x) ((x) = htons((u_short)(x)))
116
117#endif /* ! _POSIX_SOURCE */
118
119#endif /* !_MACHINE_ENDIAN_H_ */