1/*	$NetBSD: byte_swap.h,v 1.17 2020/08/10 10:59:33 rin 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 *
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 _I386_BYTE_SWAP_H_
33#define	_I386_BYTE_SWAP_H_
34
35#include <sys/types.h>
36
37#ifdef  __GNUC__
38__BEGIN_DECLS
39
40#define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
41static __inline uint32_t __byte_swap_u32_variable(uint32_t);
42static __inline uint32_t
43__byte_swap_u32_variable(uint32_t x)
44{
45	__asm volatile (
46	    "bswap %1"
47	    : "=r" (x) : "0" (x));
48	return (x);
49}
50
51#define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
52static __inline uint16_t __byte_swap_u16_variable(uint16_t);
53static __inline uint16_t
54__byte_swap_u16_variable(uint16_t x)
55{
56	__asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x));
57	return (x);
58}
59
60__END_DECLS
61#elif defined(_KERNEL)
62#define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
63#define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
64uint32_t	__byte_swap_u32_variable(uint32_t);
65uint16_t	__byte_swap_u16_variable(uint16_t);
66#endif
67
68#endif /* !_I386_BYTE_SWAP_H_ */