1 /*-
2 * Copyright (c) 1997, 1999, 2002 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Charles M. Hannum, Neil A. Carson, and Jason R. Thorpe.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #ifndef _AARCH64_BYTE_SWAP_H_
31 #define _AARCH64_BYTE_SWAP_H_
32
33 #ifdef __GNUC__
34 #include <sys/types.h>
35 __BEGIN_DECLS
36
37 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
38 static __inline uint32_t
__byte_swap_u32_variable(uint32_t v)39 __byte_swap_u32_variable(uint32_t v)
40 {
41 uint32_t t1;
42
43 t1 = v ^ ((v << 16) | (v >> 16));
44 t1 &= 0xff00ffffU;
45 v = (v >> 8) | (v << 24);
46 v ^= (t1 >> 8);
47 return (v);
48 }
49
50 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
51 static __inline uint16_t
__byte_swap_u16_variable(uint16_t v)52 __byte_swap_u16_variable(uint16_t v)
53 {
54
55 v &= 0xffff;
56 v = (v >> 8) | (v << 8);
57 return (v);
58 }
59
60 __END_DECLS
61 #endif
62
63 #endif /* _AARCH64_BYTE_SWAP_H_ */
64