1 /*-
2 * Copyright (c) 1987, 1991 Regents of the University of California.
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 * 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 7.8 (Berkeley) 4/3/91
30 * $FreeBSD$
31 */
32
33 #ifndef _MACHINE_ENDIAN_H_
34 #define _MACHINE_ENDIAN_H_
35
36 #include <sys/cdefs.h>
37 #ifndef __ASSEMBLER__
38 #include <sys/_types.h>
39 #endif
40
41 #ifdef __cplusplus
42 extern "C" {
43 #endif
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 #ifdef __MIPSEB__
54 #define _BYTE_ORDER _BIG_ENDIAN
55 #else
56 #define _BYTE_ORDER _LITTLE_ENDIAN
57 #endif /* __MIBSEB__ */
58
59 /*
60 * Deprecated variants that don't have enough underscores to be useful in more
61 * strict namespaces.
62 */
63 #if __BSD_VISIBLE
64 #define LITTLE_ENDIAN _LITTLE_ENDIAN
65 #define BIG_ENDIAN _BIG_ENDIAN
66 #define PDP_ENDIAN _PDP_ENDIAN
67 #define BYTE_ORDER _BYTE_ORDER
68 #endif
69
70 #ifndef __ASSEMBLER__
71 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
72 #define __is_constant(x) __builtin_constant_p(x)
73 #else
74 #define __is_constant(x) 0
75 #endif
76
77 #define __bswap16_const(x) (((x) >> 8) | (((x) << 8) & 0xff00))
78 #define __bswap32_const(x) (((x) >> 24) | (((x) >> 8) & 0xff00) | \
79 (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000))
80 #define __bswap64_const(x) (((x) >> 56) | (((x) >> 40) & 0xff00) | \
81 (((x) >> 24) & 0xff0000) | (((x) >> 8) & 0xff000000) | \
82 (((x) << 8) & ((__uint64_t)0xff << 32)) | \
83 (((x) << 24) & ((__uint64_t)0xff << 40)) | \
84 (((x) << 40) & ((__uint64_t)0xff << 48)) | (((x) << 56)))
85
86 static __inline __uint16_t
__bswap16_var(__uint16_t _x)87 __bswap16_var(__uint16_t _x)
88 {
89
90 return ((_x >> 8) | ((_x << 8) & 0xff00));
91 }
92
93 static __inline __uint32_t
__bswap32_var(__uint32_t _x)94 __bswap32_var(__uint32_t _x)
95 {
96
97 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
98 ((_x << 24) & 0xff000000));
99 }
100
101 static __inline __uint64_t
__bswap64_var(__uint64_t _x)102 __bswap64_var(__uint64_t _x)
103 {
104
105 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
106 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
107 ((_x << 24) & ((__uint64_t)0xff << 40)) |
108 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
109 }
110
111 #define __bswap16(x) ((__uint16_t)(__is_constant((x)) ? \
112 __bswap16_const((__uint16_t)(x)) : __bswap16_var((__uint16_t)(x))))
113 #define __bswap32(x) ((__uint32_t)(__is_constant((x)) ? \
114 __bswap32_const((__uint32_t)(x)) : __bswap32_var((__uint32_t)(x))))
115 #define __bswap64(x) ((__uint64_t)(__is_constant((x)) ? \
116 __bswap64_const((__uint64_t)(x)) : __bswap64_var((__uint64_t)(x))))
117
118 #ifdef __MIPSEB__
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 * Define the order of 32-bit words in 64-bit words.
125 */
126 /*
127 * XXXMIPS: Additional parentheses to make gcc more happy.
128 */
129 #define _QUAD_HIGHWORD 0
130 #define _QUAD_LOWWORD 1
131 #else
132 #define _QUAD_HIGHWORD 1
133 #define _QUAD_LOWWORD 0
134 #define __ntohl(x) (__bswap32((x)))
135 #define __ntohs(x) (__bswap16((x)))
136 #define __htonl(x) (__bswap32((x)))
137 #define __htons(x) (__bswap16((x)))
138 #endif /* _MIPSEB */
139
140 #endif /* _ASSEMBLER_ */
141
142 #ifdef __cplusplus
143 }
144 #endif
145
146 #endif /* !_MACHINE_ENDIAN_H_ */
147