byte_swap.h revision 1.9 
1/*	$NetBSD: byte_swap.h,v 1.9 2008/04/28 20:23:26 martin 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 Leo Weppelman.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef	M68K_BYTE_SWAP_H_
33#define	M68K_BYTE_SWAP_H_
34
35#ifdef __GNUC__
36#include <sys/types.h>
37__BEGIN_DECLS
38
39
40#define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
41static __inline uint16_t __byte_swap_u16_variable(uint16_t);
42static __inline uint16_t
43__byte_swap_u16_variable(uint16_t var)
44{
45	__asm volatile ("rorw #8, %0" : "=d" (var) : "0" (var));
46	return (var);
47}
48
49#define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
50static __inline uint32_t __byte_swap_u32_variable(uint32_t);
51static __inline uint32_t
52__byte_swap_u32_variable(uint32_t var)
53{
54	__asm volatile (
55		"rorw #8, %0; swap %0; rorw #8, %0" : "=d" (var) : "0" (var));
56	return (var);
57}
58
59__END_DECLS
60#endif
61
62#endif /* !M68K_BYTE_SWAP_H_ */
63