1/*-
2 * Copyright (c) 1987, 1991 Regents of the University of California.
3 * 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	7.8 (Berkeley) 4/3/91
30 * $FreeBSD$
31 */
32
33#ifndef _MACHINE_ENDIAN_H_
34#define	_MACHINE_ENDIAN_H_
35
36#include <sys/cdefs.h>
37#ifndef	__ASSEMBLER__
38#include <sys/_types.h>
39#endif
40
41#ifdef __cplusplus
42extern "C" {
43#endif
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#ifdef __MIPSEB__
54#define	_BYTE_ORDER	_BIG_ENDIAN
55#else
56#define _BYTE_ORDER	_LITTLE_ENDIAN
57#endif /* __MIBSEB__ */
58
59/*
60 * Deprecated variants that don't have enough underscores to be useful in more
61 * strict namespaces.
62 */
63#if __BSD_VISIBLE
64#define	LITTLE_ENDIAN	_LITTLE_ENDIAN
65#define	BIG_ENDIAN	_BIG_ENDIAN
66#define	PDP_ENDIAN	_PDP_ENDIAN
67#define	BYTE_ORDER	_BYTE_ORDER
68#endif
69
70#ifndef __ASSEMBLER__
71#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
72#define	__is_constant(x)	__builtin_constant_p(x)
73#else
74#define	__is_constant(x)	0
75#endif
76
77#define	__bswap16_const(x)	(((x) >> 8) | (((x) << 8) & 0xff00))
78#define	__bswap32_const(x)	(((x) >> 24) | (((x) >> 8) & 0xff00) |	\
79	(((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000))
80#define	__bswap64_const(x)	(((x) >> 56) | (((x) >> 40) & 0xff00) |	\
81	(((x) >> 24) & 0xff0000) | (((x) >> 8) & 0xff000000) |		\
82	(((x) << 8) & ((__uint64_t)0xff << 32)) |			\
83	(((x) << 24) & ((__uint64_t)0xff << 40)) |			\
84	(((x) << 40) & ((__uint64_t)0xff << 48)) | (((x) << 56)))
85
86static __inline __uint16_t
87__bswap16_var(__uint16_t _x)
88{
89
90	return ((_x >> 8) | ((_x << 8) & 0xff00));
91}
92
93static __inline __uint32_t
94__bswap32_var(__uint32_t _x)
95{
96
97	return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
98	    ((_x << 24) & 0xff000000));
99}
100
101static __inline __uint64_t
102__bswap64_var(__uint64_t _x)
103{
104
105	return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
106	    ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
107	    ((_x << 24) & ((__uint64_t)0xff << 40)) |
108	    ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
109}
110
111#define	__bswap16(x)	((__uint16_t)(__is_constant((x)) ?		\
112	__bswap16_const((__uint16_t)(x)) :  __bswap16_var((__uint16_t)(x))))
113#define	__bswap32(x)	((__uint32_t)(__is_constant((x)) ?		\
114	__bswap32_const((__uint32_t)(x)) :  __bswap32_var((__uint32_t)(x))))
115#define	__bswap64(x)	((__uint64_t)(__is_constant((x)) ?		\
116	__bswap64_const((__uint64_t)(x)) :  __bswap64_var((__uint64_t)(x))))
117
118#ifdef __MIPSEB__
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 * Define the order of 32-bit words in 64-bit words.
125 */
126/*
127 * XXXMIPS: Additional parentheses to make gcc more happy.
128 */
129#define _QUAD_HIGHWORD 0
130#define _QUAD_LOWWORD 1
131#else
132#define _QUAD_HIGHWORD  1
133#define _QUAD_LOWWORD 0
134#define __ntohl(x)	(__bswap32((x)))
135#define __ntohs(x)	(__bswap16((x)))
136#define __htonl(x)	(__bswap32((x)))
137#define __htons(x)	(__bswap16((x)))
138#endif /* _MIPSEB */
139
140#endif /* _ASSEMBLER_ */
141
142#ifdef __cplusplus
143}
144#endif
145
146#endif /* !_MACHINE_ENDIAN_H_ */
147