endian.h revision 84638 
1/* $FreeBSD: head/sys/ia64/include/endian.h 84638 2001-10-07 21:09:35Z dfr $ */
2/* From: NetBSD: endian.h,v 1.5 1997/10/09 15:42:19 bouyer Exp */
3
4/*
5 * Copyright (c) 1987, 1991, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	@(#)endian.h	8.1 (Berkeley) 6/10/93
37 */
38
39#ifndef _ENDIAN_H_
40#define	_ENDIAN_H_
41
42/*
43 * Define the order of 32-bit words in 64-bit words.
44 */
45#define _QUAD_HIGHWORD 1
46#define _QUAD_LOWWORD 0
47
48#ifndef _POSIX_SOURCE
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#include <machine/ansi.h>
63
64__BEGIN_DECLS
65__uint32_t	htonl __P((__uint32_t));
66__uint16_t	htons __P((__uint16_t));
67__uint32_t	ntohl __P((__uint32_t));
68__uint16_t	ntohs __P((__uint16_t));
69__END_DECLS
70
71/*
72 * Macros for network/external number representation conversion.
73 */
74#if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
75#define	ntohl(x)	(x)
76#define	ntohs(x)	(x)
77#define	htonl(x)	(x)
78#define	htons(x)	(x)
79
80#define	NTOHL(x)	(x)
81#define	NTOHS(x)	(x)
82#define	HTONL(x)	(x)
83#define	HTONS(x)	(x)
84
85#else
86
87#ifdef __GNUC__
88
89static __inline __uint64_t
90__uint8_swap_uint64(__uint64_t __x)
91{
92	__uint64_t __r;
93	__asm __volatile("mux1 %0=%1,@rev"
94			 : "=r" (__r) : "r"(__x));
95	return __r;
96}
97
98static __inline __uint32_t
99__uint8_swap_uint32(__uint32_t __x)
100{
101	return __uint8_swap_uint64(__x) >> 32;
102}
103
104static __inline __uint16_t
105__uint8_swap_uint16(__uint16_t __x)
106{
107	return __uint8_swap_uint64(__x) >> 48;
108}
109
110/*
111 * Macros for network/external number representation conversion.
112 */
113#define	ntohl	__uint8_swap_uint32
114#define	ntohs	__uint8_swap_uint16
115#define	htonl	__uint8_swap_uint32
116#define	htons	__uint8_swap_uint16
117
118#endif	/* __GNUC__ */
119
120#define	NTOHL(x)	(x) = ntohl((__uint32_t)x)
121#define	NTOHS(x)	(x) = ntohs((__uint16_t)x)
122#define	HTONL(x)	(x) = htonl((__uint32_t)x)
123#define	HTONS(x)	(x) = htons((__uint16_t)x)
124#endif
125#endif /* !_POSIX_SOURCE */
126#endif /* !_ENDIAN_H_ */
127