1/*	$OpenBSD: endian.h,v 1.14 2005/12/13 00:35:23 millert Exp $	*/
2
3/*-
4 * Copyright (c) 1997 Niklas Hallqvist.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef _I386_ENDIAN_H_
28#define _I386_ENDIAN_H_
29
30#ifdef __GNUC__
31
32#if defined(_KERNEL) && !defined(I386_CPU)
33#define	__swap32md(x) ({						\
34	u_int32_t __swap32md_x = (x);					\
35									\
36	__asm ("bswap %1" : "+r" (__swap32md_x));			\
37	__swap32md_x;							\
38})
39#else
40#define	__swap32md(x) ({						\
41	u_int32_t __swap32md_x = (x);					\
42									\
43	__asm ("rorw $8, %w1; rorl $16, %1; rorw $8, %w1" :		\
44	    "+r" (__swap32md_x));					\
45	__swap32md_x;							\
46})
47#endif	/* _KERNEL && !I386_CPU */
48
49#define	__swap64md(x) ({						\
50	u_int64_t __swap64md_x = (x);					\
51									\
52	(u_int64_t)__swap32md(__swap64md_x >> 32) |			\
53	    (u_int64_t)__swap32md(__swap64md_x & 0xffffffff) << 32;	\
54})
55#define	__swap16md(x) ({						\
56	u_int16_t __swap16md_x = (x);					\
57									\
58	__asm ("rorw $8, %w1" : "+r" (__swap16md_x));			\
59	__swap16md_x;							\
60})
61
62/* Tell sys/endian.h we have MD variants of the swap macros.  */
63#define MD_SWAP
64
65#endif	/* __GNUC__ */
66
67#define _BYTE_ORDER _LITTLE_ENDIAN
68#include <sys/endian.h>
69
70#endif /* _I386_ENDIAN_H_ */
71