source: rtems/cpukit/include/sys/endian.h @ 868cd24d

Last change on this file since 868cd24d was 868cd24d, checked in by Sebastian Huber <sebastian.huber@…>, on Apr 19, 2016 at 8:22:06 AM

score: Use Newlib provided <machine/endian.h>

  • Property mode set to 100644
File size: 5.0 KB
Line 
1/*-
2 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#ifndef _SYS_ENDIAN_H_
30#define _SYS_ENDIAN_H_
31
32#include <sys/cdefs.h>
33#include <sys/_types.h>
34#include <machine/endian.h>
35
36#ifndef _UINT8_T_DECLARED
37typedef __uint8_t       uint8_t;
38#define _UINT8_T_DECLARED
39#endif
40 
41#ifndef _UINT16_T_DECLARED
42typedef __uint16_t      uint16_t;
43#define _UINT16_T_DECLARED
44#endif
45 
46#ifndef _UINT32_T_DECLARED
47typedef __uint32_t      uint32_t;
48#define _UINT32_T_DECLARED
49#endif
50 
51#ifndef _UINT64_T_DECLARED
52typedef __uint64_t      uint64_t;
53#define _UINT64_T_DECLARED
54#endif
55 
56/*
57 * General byte order swapping functions.
58 */
59#define bswap16(x)      __bswap16(x)
60#define bswap32(x)      __bswap32(x)
61#define bswap64(x)      __bswap64(x)
62
63/*
64 * Host to big endian, host to little endian, big endian to host, and little
65 * endian to host byte order functions as detailed in byteorder(9).
66 */
67#if _BYTE_ORDER == _LITTLE_ENDIAN
68#define htobe16(x)      bswap16((x))
69#define htobe32(x)      bswap32((x))
70#define htobe64(x)      bswap64((x))
71#define htole16(x)      ((uint16_t)(x))
72#define htole32(x)      ((uint32_t)(x))
73#define htole64(x)      ((uint64_t)(x))
74
75#define be16toh(x)      bswap16((x))
76#define be32toh(x)      bswap32((x))
77#define be64toh(x)      bswap64((x))
78#define le16toh(x)      ((uint16_t)(x))
79#define le32toh(x)      ((uint32_t)(x))
80#define le64toh(x)      ((uint64_t)(x))
81#else /* _BYTE_ORDER != _LITTLE_ENDIAN */
82#define htobe16(x)      ((uint16_t)(x))
83#define htobe32(x)      ((uint32_t)(x))
84#define htobe64(x)      ((uint64_t)(x))
85#define htole16(x)      bswap16((x))
86#define htole32(x)      bswap32((x))
87#define htole64(x)      bswap64((x))
88
89#define be16toh(x)      ((uint16_t)(x))
90#define be32toh(x)      ((uint32_t)(x))
91#define be64toh(x)      ((uint64_t)(x))
92#define le16toh(x)      bswap16((x))
93#define le32toh(x)      bswap32((x))
94#define le64toh(x)      bswap64((x))
95#endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
96
97/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
98
99static __inline uint16_t
100be16dec(const void *pp)
101{
102        uint8_t const *p = (uint8_t const *)pp;
103
104        return (((unsigned)p[0] << 8) | p[1]);
105}
106
107static __inline uint32_t
108be32dec(const void *pp)
109{
110        uint8_t const *p = (uint8_t const *)pp;
111
112        return (((uint32_t)p[0] << 24) | ((uint32_t)p[1] << 16) |
113    ((uint32_t)p[2] << 8) | p[3]);
114}
115
116static __inline uint64_t
117be64dec(const void *pp)
118{
119        uint8_t const *p = (uint8_t const *)pp;
120
121        return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
122}
123
124static __inline uint16_t
125le16dec(const void *pp)
126{
127        uint8_t const *p = (uint8_t const *)pp;
128
129        return (((unsigned)p[1] << 8) | p[0]);
130}
131
132static __inline uint32_t
133le32dec(const void *pp)
134{
135        uint8_t const *p = (uint8_t const *)pp;
136
137        return (((uint32_t)p[3] << 24) | ((uint32_t)p[2] << 16) |
138    ((uint32_t)p[1] << 8) | p[0]);
139}
140
141static __inline uint64_t
142le64dec(const void *pp)
143{
144        uint8_t const *p = (uint8_t const *)pp;
145
146        return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
147}
148
149static __inline void
150be16enc(void *pp, uint16_t u)
151{
152        uint8_t *p = (uint8_t *)pp;
153
154        p[0] = (u >> 8) & 0xff;
155        p[1] = u & 0xff;
156}
157
158static __inline void
159be32enc(void *pp, uint32_t u)
160{
161        uint8_t *p = (uint8_t *)pp;
162
163        p[0] = (u >> 24) & 0xff;
164        p[1] = (u >> 16) & 0xff;
165        p[2] = (u >> 8) & 0xff;
166        p[3] = u & 0xff;
167}
168
169static __inline void
170be64enc(void *pp, uint64_t u)
171{
172        uint8_t *p = (uint8_t *)pp;
173
174        be32enc(p, (uint32_t)(u >> 32));
175        be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
176}
177
178static __inline void
179le16enc(void *pp, uint16_t u)
180{
181        uint8_t *p = (uint8_t *)pp;
182
183        p[0] = u & 0xff;
184        p[1] = (u >> 8) & 0xff;
185}
186
187static __inline void
188le32enc(void *pp, uint32_t u)
189{
190        uint8_t *p = (uint8_t *)pp;
191
192        p[0] = u & 0xff;
193        p[1] = (u >> 8) & 0xff;
194        p[2] = (u >> 16) & 0xff;
195        p[3] = (u >> 24) & 0xff;
196}
197
198static __inline void
199le64enc(void *pp, uint64_t u)
200{
201        uint8_t *p = (uint8_t *)pp;
202
203        le32enc(p, (uint32_t)(u & 0xffffffffU));
204        le32enc(p + 4, (uint32_t)(u >> 32));
205}
206
207#endif  /* _SYS_ENDIAN_H_ */
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