endian.h revision 91394 
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 91394 2002-02-27 17:16:18Z tmm $
36 */
37
38#ifndef _MACHINE_ENDIAN_H_
39#define	_MACHINE_ENDIAN_H_
40
41#include <sys/cdefs.h>
42#include <machine/ansi.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#ifndef _POSIX_SOURCE
55#define	LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
56#define	BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
57#define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
58
59#define	BYTE_ORDER	LITTLE_ENDIAN
60#endif /* !_POSIX_SOURCE */
61
62#ifdef _KERNEL
63#ifdef __GNUC__
64
65#define	_BSWAP64_DEFINED
66static __inline __uint64_t
67__bswap64(__uint64_t __x)
68{
69	__uint64_t __r;
70	__asm __volatile("mux1 %0=%1,@rev"
71			 : "=r" (__r) : "r"(__x));
72	return __r;
73}
74
75#define	_BSWAP32_DEFINED
76static __inline __uint32_t
77__bswap32(__uint32_t __x)
78{
79
80	return (__bswap64(__x) >> 32);
81}
82
83#define	_BSWAP16_DEFINED
84static __inline __uint16_t
85__bswap16(__uint16_t __x)
86{
87
88	return (__bswap64(__x) >> 48);
89}
90
91#else /* !__GNUC__ */
92/* XXX: use the libkern versions for now; these might go away soon. */
93#define	_BSWAP16_DEFINED
94__uint16_t __bswap16(__uint16_t);
95#define	_BSWAP32_DEFINED
96__uint32_t __bswap32(__uint32_t);
97#endif /* __GNUC__ */
98
99#endif /* _KERNEL */
100
101#endif /* !_MACHINE_ENDIAN_H_ */
102