1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1987, 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	@(#)endian.h	8.1 (Berkeley) 6/10/93
32 * $FreeBSD$
33 */
34
35#ifndef _MACHINE_ENDIAN_H_
36#define	_MACHINE_ENDIAN_H_
37
38#include <sys/cdefs.h>
39#include <sys/_types.h>
40
41/*
42 * Define the order of 32-bit words in 64-bit words.
43 */
44#define	_QUAD_HIGHWORD 0
45#define	_QUAD_LOWWORD 1
46
47/*
48 * Definitions for byte order, according to byte significance from low
49 * address to high.
50 */
51#define	_LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
52#define	_BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
53#define	_PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
54
55#define	_BYTE_ORDER	_BIG_ENDIAN
56
57/*
58 * Deprecated variants that don't have enough underscores to be useful in more
59 * strict namespaces.
60 */
61#if __BSD_VISIBLE
62#define	LITTLE_ENDIAN	_LITTLE_ENDIAN
63#define	BIG_ENDIAN	_BIG_ENDIAN
64#define	PDP_ENDIAN	_PDP_ENDIAN
65#define	BYTE_ORDER	_BYTE_ORDER
66#endif
67
68#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
69#define	__is_constant(x)	__builtin_constant_p(x)
70#else
71#define	__is_constant(x)	0
72#endif
73
74#define	__bswap16_const(x)	((((__uint16_t)(x) >> 8) & 0xff) |	\
75	(((__uint16_t)(x) << 8) & 0xff00))
76#define	__bswap32_const(x)	((((__uint32_t)(x) >> 24) & 0xff) |	\
77	(((__uint32_t)(x) >> 8) & 0xff00) |				\
78	(((__uint32_t)(x)<< 8) & 0xff0000) |				\
79	(((__uint32_t)(x) << 24) & 0xff000000))
80#define	__bswap64_const(x)	((((__uint64_t)(x) >> 56) & 0xff) |	\
81	(((__uint64_t)(x) >> 40) & 0xff00) |				\
82	(((__uint64_t)(x) >> 24) & 0xff0000) |				\
83	(((__uint64_t)(x) >> 8) & 0xff000000) |				\
84	(((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) |		\
85	(((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) |		\
86	(((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) |		\
87	(((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
88
89static __inline __uint16_t
90__bswap16_var(__uint16_t _x)
91{
92
93	return ((_x >> 8) | ((_x << 8) & 0xff00));
94}
95
96static __inline __uint32_t
97__bswap32_var(__uint32_t _x)
98{
99
100	return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
101	    ((_x << 24) & 0xff000000));
102}
103
104static __inline __uint64_t
105__bswap64_var(__uint64_t _x)
106{
107
108	return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
109	    ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
110	    ((_x << 24) & ((__uint64_t)0xff << 40)) |
111	    ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
112}
113
114#define	__bswap16(x)	((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \
115	__bswap16_var(x)))
116#define	__bswap32(x)	(__is_constant(x) ? __bswap32_const(x) : \
117	__bswap32_var(x))
118#define	__bswap64(x)	(__is_constant(x) ? __bswap64_const(x) : \
119	__bswap64_var(x))
120
121#define	__htonl(x)	((__uint32_t)(x))
122#define	__htons(x)	((__uint16_t)(x))
123#define	__ntohl(x)	((__uint32_t)(x))
124#define	__ntohs(x)	((__uint16_t)(x))
125
126#endif /* !_MACHINE_ENDIAN_H_ */
127