byte_swap.h revision 1.8 
1/*	$NetBSD: byte_swap.h,v 1.8 2021/04/17 20:12:55 rillig Exp $	*/
2
3/*-
4 * Copyright (c) 1998, 2010 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/*
33 * Copy of the i386 version. 64 bit versions may be added later.
34 */
35
36#ifndef _AMD64_BYTE_SWAP_H_
37#define	_AMD64_BYTE_SWAP_H_
38
39#ifdef __x86_64__
40
41#ifdef  __GNUC__
42#include <sys/types.h>
43__BEGIN_DECLS
44
45#define	__BYTE_SWAP_U64_VARIABLE __byte_swap_u64_variable
46static __inline uint64_t __byte_swap_u64_variable(uint64_t);
47static __inline uint64_t
48__byte_swap_u64_variable(uint64_t x)
49{
50	__asm volatile ( "bswap %1" : "=r" (x) : "0" (x));
51	return (x);
52}
53
54#define	__BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
55static __inline uint32_t __byte_swap_u32_variable(uint32_t);
56static __inline uint32_t
57__byte_swap_u32_variable(uint32_t x)
58{
59	__asm volatile ( "bswap %1" : "=r" (x) : "0" (x));
60	return (x);
61}
62
63#define	__BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
64static __inline uint16_t __byte_swap_u16_variable(uint16_t);
65static __inline uint16_t
66__byte_swap_u16_variable(uint16_t x)
67{
68	__asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x));
69	return (x);
70}
71
72__END_DECLS
73#endif
74
75#else	/*	__x86_64__	*/
76
77#include <i386/byte_swap.h>
78
79#endif	/*	__x86_64__	*/
80
81#endif /* !_AMD64_BYTE_SWAP_H_ */
82