1/*-
2 * Copyright (c) 2001 David E. O'Brien
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the University nor the names of its contributors
13 *    may be used to endorse or promote products derived from this software
14 *    without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 *	@(#)endian.h	8.1 (Berkeley) 6/10/93
29 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
30 * $FreeBSD$
31 */
32
33#ifndef _MACHINE_ENDIAN_H_
34#define	_MACHINE_ENDIAN_H_
35
36#include <sys/_types.h>
37
38/*
39 * Definitions for byte order, according to byte significance from low
40 * address to high.
41 */
42#define	_LITTLE_ENDIAN  1234    /* LSB first: i386, vax */
43#define	_BIG_ENDIAN     4321    /* MSB first: 68000, ibm, net */
44#define	_PDP_ENDIAN     3412    /* LSB first in word, MSW first in long */
45
46#define	_BYTE_ORDER	_LITTLE_ENDIAN
47
48#if __BSD_VISIBLE
49#define	LITTLE_ENDIAN   _LITTLE_ENDIAN
50#define	BIG_ENDIAN      _BIG_ENDIAN
51#define	PDP_ENDIAN      _PDP_ENDIAN
52#define	BYTE_ORDER      _BYTE_ORDER
53#endif
54
55#define	_QUAD_HIGHWORD  1
56#define	_QUAD_LOWWORD 0
57#define	__ntohl(x)        (__bswap32(x))
58#define	__ntohs(x)        (__bswap16(x))
59#define	__htonl(x)        (__bswap32(x))
60#define	__htons(x)        (__bswap16(x))
61
62static __inline __uint64_t
63__bswap64(__uint64_t x)
64{
65	__uint64_t ret;
66
67	__asm __volatile("rev %0, %1\n"
68			 : "=&r" (ret), "+r" (x));
69
70	return (ret);
71}
72
73static __inline __uint32_t
74__bswap32_var(__uint32_t v)
75{
76	__uint32_t ret;
77
78	__asm __volatile("rev32 %x0, %x1\n"
79			 : "=&r" (ret), "+r" (v));
80
81	return (ret);
82}
83
84static __inline __uint16_t
85__bswap16_var(__uint16_t v)
86{
87	__uint32_t ret;
88
89	__asm __volatile("rev16 %w0, %w1\n"
90			 : "=&r" (ret), "+r" (v));
91
92	return ((__uint16_t)ret);
93}
94
95#ifdef __OPTIMIZE__
96
97#define	__bswap32_constant(x)	\
98    ((((x) & 0xff000000U) >> 24) |	\
99     (((x) & 0x00ff0000U) >>  8) |	\
100     (((x) & 0x0000ff00U) <<  8) |	\
101     (((x) & 0x000000ffU) << 24))
102
103#define	__bswap16_constant(x)	\
104    ((((x) & 0xff00) >> 8) |		\
105     (((x) & 0x00ff) << 8))
106
107#define	__bswap16(x)	\
108    ((__uint16_t)(__builtin_constant_p(x) ?	\
109     __bswap16_constant(x) :			\
110     __bswap16_var(x)))
111
112#define	__bswap32(x)	\
113    ((__uint32_t)(__builtin_constant_p(x) ? 	\
114     __bswap32_constant(x) :			\
115     __bswap32_var(x)))
116
117#else
118#define	__bswap16(x)	__bswap16_var(x)
119#define	__bswap32(x)	__bswap32_var(x)
120
121#endif /* __OPTIMIZE__ */
122#endif /* !_MACHINE_ENDIAN_H_ */
123