1 /* $NetBSD: byte_swap.h,v 1.10 2006/01/30 22:46:36 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 #ifndef _I386_BYTE_SWAP_H_
40 #define _I386_BYTE_SWAP_H_
41
42 #include <sys/types.h>
43
44 #if defined(_KERNEL_OPT)
45 #include "opt_cputype.h"
46 #endif
47
48 #ifdef __GNUC__
49 #include <sys/types.h>
50 __BEGIN_DECLS
51
52 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
53 static __inline uint32_t __byte_swap_u32_variable(uint32_t);
54 static __inline uint32_t
__byte_swap_u32_variable(uint32_t x)55 __byte_swap_u32_variable(uint32_t x)
56 {
57 __asm volatile (
58 #if defined(_KERNEL) && !defined(_LKM) && !defined(I386_CPU)
59 "bswap %1"
60 #else
61 "rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1"
62 #endif
63 : "=r" (x) : "0" (x));
64 return (x);
65 }
66
67 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
68 static __inline uint16_t __byte_swap_u16_variable(uint16_t);
69 static __inline uint16_t
__byte_swap_u16_variable(uint16_t x)70 __byte_swap_u16_variable(uint16_t x)
71 {
72 __asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x));
73 return (x);
74 }
75
76 __END_DECLS
77 #endif
78
79 #endif /* !_I386_BYTE_SWAP_H_ */
80