endian.h revision 102227 
1/*-
2 * Copyright (c) 1987, 1991, 1993
3 *	The Regents of the University of California.  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 *	@(#)endian.h	8.1 (Berkeley) 6/10/93
34 *	$NetBSD: endian.h,v 1.5 1997/10/09 15:42:19 bouyer Exp $
35 * $FreeBSD: head/sys/ia64/include/endian.h 102227 2002-08-21 16:20:02Z mike $
36 */
37
38#ifndef _MACHINE_ENDIAN_H_
39#define	_MACHINE_ENDIAN_H_
40
41#include <sys/cdefs.h>
42#include <sys/_types.h>
43
44/*
45 * Define the order of 32-bit words in 64-bit words.
46 */
47#define _QUAD_HIGHWORD 1
48#define _QUAD_LOWWORD 0
49
50/*
51 * Definitions for byte order, according to byte significance from low
52 * address to high.
53 */
54#define	_LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
55#define	_BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
56#define	_PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
57
58#define	_BYTE_ORDER	_LITTLE_ENDIAN
59
60/*
61 * Deprecated variants that don't have enough underscores to be useful in more
62 * strict namespaces.
63 */
64#if __BSD_VISIBLE
65#define	LITTLE_ENDIAN	_LITTLE_ENDIAN
66#define	BIG_ENDIAN	_BIG_ENDIAN
67#define	PDP_ENDIAN	_PDP_ENDIAN
68#define	BYTE_ORDER	_BYTE_ORDER
69#endif
70
71#ifdef __GNUC__
72
73static __inline __uint64_t
74__bswap64(__uint64_t __x)
75{
76	__uint64_t __r;
77	__asm __volatile("mux1 %0=%1,@rev"
78			 : "=r" (__r) : "r"(__x));
79	return __r;
80}
81
82static __inline __uint32_t
83__bswap32(__uint32_t __x)
84{
85
86	return (__bswap64(__x) >> 32);
87}
88
89static __inline __uint16_t
90__bswap16(__uint16_t __x)
91{
92
93	return (__bswap64(__x) >> 48);
94}
95
96#endif /* __GNUC__ */
97
98#define	__htonl(x)	__bswap32(x)
99#define	__htons(x)	__bswap16(x)
100#define	__ntohl(x)	__bswap32(x)
101#define	__ntohs(x)	__bswap16(x)
102
103#endif /* !_MACHINE_ENDIAN_H_ */
104