1 /*-
2 * Copyright (c) 1987, 1991, 1993
3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)endian.h 8.1 (Berkeley) 6/10/93
30 * $FreeBSD: stable/9/sys/sparc64/include/endian.h 233349 2012-03-23 10:55:19Z dim $
31 */
32
33 #ifndef _MACHINE_ENDIAN_H_
34 #define _MACHINE_ENDIAN_H_
35
36 #include <sys/cdefs.h>
37 #include <sys/_types.h>
38
39 /*
40 * Define the order of 32-bit words in 64-bit words.
41 */
42 #define _QUAD_HIGHWORD 0
43 #define _QUAD_LOWWORD 1
44
45 /*
46 * Definitions for byte order, according to byte significance from low
47 * address to high.
48 */
49 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
50 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
51 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
52
53 #define _BYTE_ORDER _BIG_ENDIAN
54
55 /*
56 * Deprecated variants that don't have enough underscores to be useful in more
57 * strict namespaces.
58 */
59 #if __BSD_VISIBLE
60 #define LITTLE_ENDIAN _LITTLE_ENDIAN
61 #define BIG_ENDIAN _BIG_ENDIAN
62 #define PDP_ENDIAN _PDP_ENDIAN
63 #define BYTE_ORDER _BYTE_ORDER
64 #endif
65
66 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
67 #define __is_constant(x) __builtin_constant_p(x)
68 #else
69 #define __is_constant(x) 0
70 #endif
71
72 #define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \
73 (((__uint16_t)(x) << 8) & 0xff00))
74 #define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \
75 (((__uint32_t)(x) >> 8) & 0xff00) | \
76 (((__uint32_t)(x)<< 8) & 0xff0000) | \
77 (((__uint32_t)(x) << 24) & 0xff000000))
78 #define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \
79 (((__uint64_t)(x) >> 40) & 0xff00) | \
80 (((__uint64_t)(x) >> 24) & 0xff0000) | \
81 (((__uint64_t)(x) >> 8) & 0xff000000) | \
82 (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \
83 (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \
84 (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \
85 (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
86
87 static __inline __uint16_t
__bswap16_var(__uint16_t _x)88 __bswap16_var(__uint16_t _x)
89 {
90
91 return ((_x >> 8) | ((_x << 8) & 0xff00));
92 }
93
94 static __inline __uint32_t
__bswap32_var(__uint32_t _x)95 __bswap32_var(__uint32_t _x)
96 {
97
98 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
99 ((_x << 24) & 0xff000000));
100 }
101
102 static __inline __uint64_t
__bswap64_var(__uint64_t _x)103 __bswap64_var(__uint64_t _x)
104 {
105
106 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
107 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
108 ((_x << 24) & ((__uint64_t)0xff << 40)) |
109 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
110 }
111
112 #define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \
113 __bswap16_var(x)))
114 #define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \
115 __bswap32_var(x))
116 #define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \
117 __bswap64_var(x))
118
119 #define __htonl(x) ((__uint32_t)(x))
120 #define __htons(x) ((__uint16_t)(x))
121 #define __ntohl(x) ((__uint32_t)(x))
122 #define __ntohs(x) ((__uint16_t)(x))
123
124 #endif /* !_MACHINE_ENDIAN_H_ */
125