1 /* $NetBSD: byte_swap.h,v 1.2 2014/10/29 01:33:39 dennis Exp $ */
2
3 /*-
4 * Copyright (c) 2014 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
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 _OR1K_BYTE_SWAP_H_
33 #define _OR1K_BYTE_SWAP_H_
34
35 #ifdef _LOCORE
36
37 #define BSWAP16(_src, _dst, _tmp) \
38 l.extbz _dst, _src; \
39 l.slli _dst, _dst, 8; \
40 l.srli _tmp, _src, 8; \
41 l.extbz _tmp, _tmp; \
42 l.or _dst, _dst, _tmp
43
44 #define BSWAP32(_src, _dst, _tmp) \
45 l.movhi _tmp, 0xff00 ;\
46 l.ori _tmp, _tmp, 0xff00 /* tmp = 0xff00ff00 */ ;\
47 l.slri _dst, _tmp, 8 /* dst = 0x00ff00ff */ ;\
48 l.and _tmp, _tmp, _src /* tmp = 0xaa00cc00 */ ;\
49 l.and _dst, _dst, _src /* dst = 0x00bb00dd */ ;\
50 l.ror _tmp, _tmp, 24 /* tmp = 0x00cc00aa */ ;\
51 l.ror _dst, _dst, 8 /* dst = 0xdd00bb00 */ ;\
52 l.or _dst, _dst, _tmp /* dst = 0xddccbbaa */ ;\
53
54 #else
55
56 #include <sys/types.h>
57 __BEGIN_DECLS
58
59 #define __BYTE_SWAP_U64_VARIABLE __byte_swap_u64_variable
60 static __inline uint64_t
__byte_swap_u64_variable(uint64_t v)61 __byte_swap_u64_variable(uint64_t v)
62 {
63 v = ((v & 0x000000ff) << (56 - 0)) | ((v >> (56 - 0)) & 0x000000ff)
64 | ((v & 0x0000ff00) << (48 - 8)) | ((v >> (48 - 8)) & 0x0000ff00)
65 | ((v & 0x00ff0000) << (40 - 16)) | ((v >> (40 - 16)) & 0x00ff0000)
66 | ((v & 0xff000000) << (32 - 24)) | ((v >> (32 - 24)) & 0xff000000);
67
68 return v;
69 }
70
71 #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
72 static __inline uint32_t
__byte_swap_u32_variable(uint32_t v)73 __byte_swap_u32_variable(uint32_t v)
74 {
75 v = ((v & 0x00ff) << (24 - 0)) | ((v >> (24 - 0)) & 0x00ff)
76 | ((v & 0xff00) << (16 - 8)) | ((v >> (16 - 8)) & 0xff00);
77
78 return v;
79 }
80
81 #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
82 static __inline uint16_t
__byte_swap_u16_variable(uint16_t v)83 __byte_swap_u16_variable(uint16_t v)
84 {
85 v &= 0xffff;
86 v = (v >> 8) | (v << 8);
87
88 return v;
89 }
90
91 __END_DECLS
92
93 #endif /* _LOCORE */
94
95 #endif /* _OR1K_BYTE_SWAP_H_ */
96