source: rtems/cpukit/include/sys/endian.h @ a2b6895

4.115
Last change on this file since a2b6895 was a2b6895, checked in by Sebastian Huber <sebastian.huber@…>, on 11/13/14 at 10:55:51

Add <sys/endian.h>

  • Property mode set to 100644
File size: 4.9 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 <rtems/endian.h>
34 
35/*
36 * General byte order swapping functions.
37 */
38#define bswap16(x)      CPU_swap_u16(x)
39#define bswap32(x)      CPU_swap_u32(x)
40static __inline uint64_t
41bswap64(uint64_t v)
42{
43#ifdef __GNUC__
44        return __builtin_bswap64(v);
45#else
46        return ((v >> 56) | ((v >> 40) & 0xff00) | ((v >> 24) & 0xff0000) |
47            ((v >> 8) & 0xff000000) | ((v << 8) & ((uint64_t)0xff << 32)) |
48            ((v << 24) & ((uint64_t)0xff << 40)) |
49            ((v << 40) & ((uint64_t)0xff << 48)) | ((v << 56)));
50#endif
51}
52
53/*
54 * Host to big endian, host to little endian, big endian to host, and little
55 * endian to host byte order functions as detailed in byteorder(9).
56 */
57#if BYTE_ORDER == LITTLE_ENDIAN
58#define htobe16(x)      bswap16((x))
59#define htobe32(x)      bswap32((x))
60#define htobe64(x)      bswap64((x))
61#define htole16(x)      ((uint16_t)(x))
62#define htole32(x)      ((uint32_t)(x))
63#define htole64(x)      ((uint64_t)(x))
64
65#define be16toh(x)      bswap16((x))
66#define be32toh(x)      bswap32((x))
67#define be64toh(x)      bswap64((x))
68#define le16toh(x)      ((uint16_t)(x))
69#define le32toh(x)      ((uint32_t)(x))
70#define le64toh(x)      ((uint64_t)(x))
71#else /* BYTE_ORDER != LITTLE_ENDIAN */
72#define htobe16(x)      ((uint16_t)(x))
73#define htobe32(x)      ((uint32_t)(x))
74#define htobe64(x)      ((uint64_t)(x))
75#define htole16(x)      bswap16((x))
76#define htole32(x)      bswap32((x))
77#define htole64(x)      bswap64((x))
78
79#define be16toh(x)      ((uint16_t)(x))
80#define be32toh(x)      ((uint32_t)(x))
81#define be64toh(x)      ((uint64_t)(x))
82#define le16toh(x)      bswap16((x))
83#define le32toh(x)      bswap32((x))
84#define le64toh(x)      bswap64((x))
85#endif /* BYTE_ORDER == LITTLE_ENDIAN */
86
87/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
88
89static __inline uint16_t
90be16dec(const void *pp)
91{
92        uint8_t const *p = (uint8_t const *)pp;
93
94        return ((p[0] << 8) | p[1]);
95}
96
97static __inline uint32_t
98be32dec(const void *pp)
99{
100        uint8_t const *p = (uint8_t const *)pp;
101
102        return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
103}
104
105static __inline uint64_t
106be64dec(const void *pp)
107{
108        uint8_t const *p = (uint8_t const *)pp;
109
110        return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
111}
112
113static __inline uint16_t
114le16dec(const void *pp)
115{
116        uint8_t const *p = (uint8_t const *)pp;
117
118        return ((p[1] << 8) | p[0]);
119}
120
121static __inline uint32_t
122le32dec(const void *pp)
123{
124        uint8_t const *p = (uint8_t const *)pp;
125
126        return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
127}
128
129static __inline uint64_t
130le64dec(const void *pp)
131{
132        uint8_t const *p = (uint8_t const *)pp;
133
134        return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
135}
136
137static __inline void
138be16enc(void *pp, uint16_t u)
139{
140        uint8_t *p = (uint8_t *)pp;
141
142        p[0] = (u >> 8) & 0xff;
143        p[1] = u & 0xff;
144}
145
146static __inline void
147be32enc(void *pp, uint32_t u)
148{
149        uint8_t *p = (uint8_t *)pp;
150
151        p[0] = (u >> 24) & 0xff;
152        p[1] = (u >> 16) & 0xff;
153        p[2] = (u >> 8) & 0xff;
154        p[3] = u & 0xff;
155}
156
157static __inline void
158be64enc(void *pp, uint64_t u)
159{
160        uint8_t *p = (uint8_t *)pp;
161
162        be32enc(p, (uint32_t)(u >> 32));
163        be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
164}
165
166static __inline void
167le16enc(void *pp, uint16_t u)
168{
169        uint8_t *p = (uint8_t *)pp;
170
171        p[0] = u & 0xff;
172        p[1] = (u >> 8) & 0xff;
173}
174
175static __inline void
176le32enc(void *pp, uint32_t u)
177{
178        uint8_t *p = (uint8_t *)pp;
179
180        p[0] = u & 0xff;
181        p[1] = (u >> 8) & 0xff;
182        p[2] = (u >> 16) & 0xff;
183        p[3] = (u >> 24) & 0xff;
184}
185
186static __inline void
187le64enc(void *pp, uint64_t u)
188{
189        uint8_t *p = (uint8_t *)pp;
190
191        le32enc(p, (uint32_t)(u & 0xffffffffU));
192        le32enc(p + 4, (uint32_t)(u >> 32));
193}
194
195#endif  /* _SYS_ENDIAN_H_ */
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