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 * $FreeBSD$
31 */
32
33#ifndef _MACHINE_ENDIAN_H_
34#define	_MACHINE_ENDIAN_H_
35
36#include <sys/cdefs.h>
37#include <sys/_types.h>
38
39/*
40 * Define the order of 32-bit words in 64-bit words.
41 */
42#define	_QUAD_HIGHWORD 0
43#define	_QUAD_LOWWORD 1
44
45/*
46 * Definitions for byte order, according to byte significance from low
47 * address to high.
48 */
49#define	_LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
50#define	_BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
51#define	_PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
52
53#define	_BYTE_ORDER	_BIG_ENDIAN
54
55/*
56 * Deprecated variants that don't have enough underscores to be useful in more
57 * strict namespaces.
58 */
59#if __BSD_VISIBLE
60#define	LITTLE_ENDIAN	_LITTLE_ENDIAN
61#define	BIG_ENDIAN	_BIG_ENDIAN
62#define	PDP_ENDIAN	_PDP_ENDIAN
63#define	BYTE_ORDER	_BYTE_ORDER
64#endif
65
66#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
67#define	__is_constant(x)	__builtin_constant_p(x)
68#else
69#define	__is_constant(x)	0
70#endif
71
72#define	__bswap16_const(x)	((((__uint16_t)(x) >> 8) & 0xff) |	\
73	(((__uint16_t)(x) << 8) & 0xff00))
74#define	__bswap32_const(x)	((((__uint32_t)(x) >> 24) & 0xff) |	\
75	(((__uint32_t)(x) >> 8) & 0xff00) |				\
76	(((__uint32_t)(x)<< 8) & 0xff0000) |				\
77	(((__uint32_t)(x) << 24) & 0xff000000))
78#define	__bswap64_const(x)	((((__uint64_t)(x) >> 56) & 0xff) |	\
79	(((__uint64_t)(x) >> 40) & 0xff00) |				\
80	(((__uint64_t)(x) >> 24) & 0xff0000) |				\
81	(((__uint64_t)(x) >> 8) & 0xff000000) |				\
82	(((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) |		\
83	(((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) |		\
84	(((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) |		\
85	(((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
86
87static __inline __uint16_t
88__bswap16_var(__uint16_t _x)
89{
90
91	return ((_x >> 8) | ((_x << 8) & 0xff00));
92}
93
94static __inline __uint32_t
95__bswap32_var(__uint32_t _x)
96{
97
98	return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
99	    ((_x << 24) & 0xff000000));
100}
101
102static __inline __uint64_t
103__bswap64_var(__uint64_t _x)
104{
105
106	return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
107	    ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
108	    ((_x << 24) & ((__uint64_t)0xff << 40)) |
109	    ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
110}
111
112#define	__bswap16(x)	((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \
113	__bswap16_var(x)))
114#define	__bswap32(x)	(__is_constant(x) ? __bswap32_const(x) : \
115	__bswap32_var(x))
116#define	__bswap64(x)	(__is_constant(x) ? __bswap64_const(x) : \
117	__bswap64_var(x))
118
119#define	__htonl(x)	((__uint32_t)(x))
120#define	__htons(x)	((__uint16_t)(x))
121#define	__ntohl(x)	((__uint32_t)(x))
122#define	__ntohs(x)	((__uint16_t)(x))
123
124#endif /* !_MACHINE_ENDIAN_H_ */
125