Annotation of sys/arch/amd64/include/endian.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: endian.h,v 1.3 2005/12/13 00:35:22 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: #define __swap32md(x) ({ \
33: u_int32_t __swap32md_x = (x); \
34: \
35: __asm ("bswap %1" : "+r" (__swap32md_x)); \
36: __swap32md_x; \
37: })
38:
39: /* XXX - I'm sure there is a better way on this cpu. */
40: #define __swap64md(x) ({ \
41: u_int64_t __swap64md_x = (x); \
42: \
43: (u_int64_t)__swap32md(__swap64md_x >> 32) | \
44: (u_int64_t)__swap32md(__swap64md_x & 0xffffffff) << 32; \
45: })
46:
47: #define __swap16md(x) ({ \
48: u_int16_t __swap16md_x = (x); \
49: \
50: __asm ("rorw $8, %w1" : "+r" (__swap16md_x)); \
51: __swap16md_x; \
52: })
53:
54: /* Tell sys/endian.h we have MD variants of the swap macros. */
55: #define MD_SWAP
56:
57: #endif /* __GNUC__ */
58:
59: #define _BYTE_ORDER _LITTLE_ENDIAN
60: #include <sys/endian.h>
61:
62: #endif /* _I386_ENDIAN_H_ */
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