1 /* $OpenBSD: endian.h,v 1.15 2007/05/29 18:18:20 tom 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 #define __swap32md(x) ({ \
33 u_int32_t __swap32md_x = (x); \
34 \
35 __asm ("bswap %1" : "+r" (__swap32md_x)); \
36 __swap32md_x; \
37 })
38
39 #define __swap64md(x) ({ \
40 u_int64_t __swap64md_x = (x); \
41 \
42 (u_int64_t)__swap32md(__swap64md_x >> 32) | \
43 (u_int64_t)__swap32md(__swap64md_x & 0xffffffff) << 32; \
44 })
45 #define __swap16md(x) ({ \
46 u_int16_t __swap16md_x = (x); \
47 \
48 __asm ("rorw $8, %w1" : "+r" (__swap16md_x)); \
49 __swap16md_x; \
50 })
51
52 /* Tell sys/endian.h we have MD variants of the swap macros. */
53 #define MD_SWAP
54
55 #endif /* __GNUC__ */
56
57 #define _BYTE_ORDER _LITTLE_ENDIAN
58 #include <sys/endian.h>
59
60 #endif /* _I386_ENDIAN_H_ */