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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	@(#)endian.h	8.1 (Berkeley) 6/10/93
30 *	$NetBSD: endian.h,v 1.5 1997/10/09 15:42:19 bouyer Exp $
31 * $FreeBSD$
32 */
33
34#ifndef _MACHINE_ENDIAN_H_
35#define	_MACHINE_ENDIAN_H_
36
37#include <sys/cdefs.h>
38#include <sys/_types.h>
39
40/*
41 * Define the order of 32-bit words in 64-bit words.
42 */
43#define	_QUAD_HIGHWORD 1
44#define	_QUAD_LOWWORD 0
45
46/*
47 * Definitions for byte order, according to byte significance from low
48 * address to high.
49 */
50#define	_LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
51#define	_BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
52#define	_PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
53
54#define	_BYTE_ORDER	_LITTLE_ENDIAN
55
56/*
57 * Deprecated variants that don't have enough underscores to be useful in more
58 * strict namespaces.
59 */
60#if __BSD_VISIBLE
61#define	LITTLE_ENDIAN	_LITTLE_ENDIAN
62#define	BIG_ENDIAN	_BIG_ENDIAN
63#define	PDP_ENDIAN	_PDP_ENDIAN
64#define	BYTE_ORDER	_BYTE_ORDER
65#endif
66
67#if defined(__CC_SUPPORTS___INLINE) && defined(__GNUCLIKE_ASM)
68
69static __inline __uint64_t
70__bswap64(__uint64_t _x)
71{
72	__uint64_t __r;
73
74	__asm __volatile("mux1 %0=%1,@rev"
75			 : "=r" (__r) : "r"(_x));
76	return __r;
77}
78
79static __inline __uint32_t
80__bswap32(__uint32_t _x)
81{
82
83	return (__bswap64(_x) >> 32);
84}
85
86static __inline __uint16_t
87__bswap16(__uint16_t _x)
88{
89
90	return (__bswap64(_x) >> 48);
91}
92
93#define	__htonl(x)	__bswap32(x)
94#define	__htons(x)	__bswap16(x)
95#define	__ntohl(x)	__bswap32(x)
96#define	__ntohs(x)	__bswap16(x)
97
98#else /* !(__CC_SUPPORTS___INLINE && __GNUCLIKE_ASM) */
99
100/*
101 * No optimizations are available for this compiler.  Fall back to
102 * non-optimized functions by defining the constant usually used to prevent
103 * redefinition.
104 */
105#define	_BYTEORDER_FUNC_DEFINED
106
107#endif /* __CC_SUPPORTS___INLINE && __GNUCLIKE_ASM */
108
109#endif /* !_MACHINE_ENDIAN_H_ */
110