1 /* $NetBSD: byte_swap.h,v 1.4 2006/01/30 22:46:35 dsl Exp $ */
2
3 /*-
4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 /*
40 * Copy of the i386 version. 64 bit versions may be added later.
41 */
42
43 #ifndef _AMD64_BYTE_SWAP_H_
44 #define _AMD64_BYTE_SWAP_H_
45
46 #ifdef __GNUC__
47 #include <sys/types.h>
48 __BEGIN_DECLS
49
50 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
51 static __inline uint32_t __byte_swap_u32_variable(uint32_t);
52 static __inline uint32_t
__byte_swap_u32_variable(uint32_t x)53 __byte_swap_u32_variable(uint32_t x)
54 {
55 __asm volatile ( "bswap %1" : "=r" (x) : "0" (x));
56 return (x);
57 }
58
59 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
60 static __inline uint16_t __byte_swap_u16_variable(uint16_t);
61 static __inline uint16_t
__byte_swap_u16_variable(uint16_t x)62 __byte_swap_u16_variable(uint16_t x)
63 {
64 __asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x));
65 return (x);
66 }
67
68 __END_DECLS
69 #endif
70
71 #endif /* !_AMD64_BYTE_SWAP_H_ */
72