2 * Copyright (c) 1987, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 * @(#)endian.h 8.1 (Berkeley) 6/10/93
33 #ifndef _MACHINE_ENDIAN_H_
34 #define _MACHINE_ENDIAN_H_
36 #include <sys/cdefs.h>
37 #include <sys/_types.h>
40 * Define the order of 32-bit words in 64-bit words.
42 #define _QUAD_HIGHWORD 0
43 #define _QUAD_LOWWORD 1
46 * GCC defines _BIG_ENDIAN and _LITTLE_ENDIAN equal to __BIG_ENDIAN__
47 * and __LITTLE_ENDIAN__ (resp).
57 * Definitions for byte order, according to byte significance from low
60 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
61 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
62 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
64 #ifdef __LITTLE_ENDIAN__
65 #define _BYTE_ORDER _LITTLE_ENDIAN
67 #define _BYTE_ORDER _BIG_ENDIAN
71 * Deprecated variants that don't have enough underscores to be useful in more
75 #define LITTLE_ENDIAN _LITTLE_ENDIAN
76 #define BIG_ENDIAN _BIG_ENDIAN
77 #define PDP_ENDIAN _PDP_ENDIAN
78 #define BYTE_ORDER _BYTE_ORDER
81 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
82 #define __is_constant(x) __builtin_constant_p(x)
84 #define __is_constant(x) 0
87 #define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \
88 (((__uint16_t)(x) << 8) & 0xff00))
89 #define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \
90 (((__uint32_t)(x) >> 8) & 0xff00) | \
91 (((__uint32_t)(x)<< 8) & 0xff0000) | \
92 (((__uint32_t)(x) << 24) & 0xff000000))
93 #define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \
94 (((__uint64_t)(x) >> 40) & 0xff00) | \
95 (((__uint64_t)(x) >> 24) & 0xff0000) | \
96 (((__uint64_t)(x) >> 8) & 0xff000000) | \
97 (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \
98 (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \
99 (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \
100 (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
102 static __inline __uint16_t
103 __bswap16_var(__uint16_t _x)
106 return ((_x >> 8) | ((_x << 8) & 0xff00));
109 static __inline __uint32_t
110 __bswap32_var(__uint32_t _x)
113 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
114 ((_x << 24) & 0xff000000));
117 static __inline __uint64_t
118 __bswap64_var(__uint64_t _x)
121 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
122 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
123 ((_x << 24) & ((__uint64_t)0xff << 40)) |
124 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
127 #define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \
129 #define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \
131 #define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \
134 #define __htonl(x) ((__uint32_t)(x))
135 #define __htons(x) ((__uint16_t)(x))
136 #define __ntohl(x) ((__uint32_t)(x))
137 #define __ntohs(x) ((__uint16_t)(x))
139 #endif /* !_MACHINE_ENDIAN_H_ */