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.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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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 #ifdef __LITTLE_ENDIAN__
43 #define _QUAD_HIGHWORD 1
44 #define _QUAD_LOWWORD 0
46 #define _QUAD_HIGHWORD 0
47 #define _QUAD_LOWWORD 1
51 * GCC defines _BIG_ENDIAN and _LITTLE_ENDIAN equal to __BIG_ENDIAN__
52 * and __LITTLE_ENDIAN__ (resp).
62 * Definitions for byte order, according to byte significance from low
65 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
66 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
67 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
69 #ifdef __LITTLE_ENDIAN__
70 #define _BYTE_ORDER _LITTLE_ENDIAN
72 #define _BYTE_ORDER _BIG_ENDIAN
76 * Deprecated variants that don't have enough underscores to be useful in more
80 #define LITTLE_ENDIAN _LITTLE_ENDIAN
81 #define BIG_ENDIAN _BIG_ENDIAN
82 #define PDP_ENDIAN _PDP_ENDIAN
83 #define BYTE_ORDER _BYTE_ORDER
86 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
87 #define __is_constant(x) __builtin_constant_p(x)
89 #define __is_constant(x) 0
92 #define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \
93 (((__uint16_t)(x) << 8) & 0xff00))
94 #define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \
95 (((__uint32_t)(x) >> 8) & 0xff00) | \
96 (((__uint32_t)(x)<< 8) & 0xff0000) | \
97 (((__uint32_t)(x) << 24) & 0xff000000))
98 #define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \
99 (((__uint64_t)(x) >> 40) & 0xff00) | \
100 (((__uint64_t)(x) >> 24) & 0xff0000) | \
101 (((__uint64_t)(x) >> 8) & 0xff000000) | \
102 (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \
103 (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \
104 (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \
105 (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56)))
107 static __inline __uint16_t
108 __bswap16_var(__uint16_t _x)
111 return ((_x >> 8) | ((_x << 8) & 0xff00));
114 static __inline __uint32_t
115 __bswap32_var(__uint32_t _x)
118 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
119 ((_x << 24) & 0xff000000));
122 static __inline __uint64_t
123 __bswap64_var(__uint64_t _x)
126 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
127 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
128 ((_x << 24) & ((__uint64_t)0xff << 40)) |
129 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
132 #define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \
134 #define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \
136 #define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \
139 #ifdef __LITTLE_ENDIAN__
140 #define __htonl(x) (__bswap32((__uint32_t)(x)))
141 #define __htons(x) (__bswap16((__uint16_t)(x)))
142 #define __ntohl(x) (__bswap32((__uint32_t)(x)))
143 #define __ntohs(x) (__bswap16((__uint16_t)(x)))
145 #define __htonl(x) ((__uint32_t)(x))
146 #define __htons(x) ((__uint16_t)(x))
147 #define __ntohl(x) ((__uint32_t)(x))
148 #define __ntohs(x) ((__uint16_t)(x))
151 #endif /* !_MACHINE_ENDIAN_H_ */