1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1987, 1991 Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)endian.h 7.8 (Berkeley) 4/3/91
32 * $FreeBSD$
33 */
34
35 #ifndef _MACHINE_ENDIAN_H_
36 #define _MACHINE_ENDIAN_H_
37
38 #include <sys/cdefs.h>
39 #ifndef __ASSEMBLER__
40 #include <sys/_types.h>
41 #endif
42
43 #ifdef __cplusplus
44 extern "C" {
45 #endif
46
47 /*
48 * Definitions for byte order, according to byte significance from low
49 * address to high.
50 */
51 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
52 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
53 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
54
55 #ifdef __MIPSEB__
56 #define _BYTE_ORDER _BIG_ENDIAN
57 #else
58 #define _BYTE_ORDER _LITTLE_ENDIAN
59 #endif /* __MIBSEB__ */
60
61 /*
62 * Deprecated variants that don't have enough underscores to be useful in more
63 * strict namespaces.
64 */
65 #if __BSD_VISIBLE
66 #define LITTLE_ENDIAN _LITTLE_ENDIAN
67 #define BIG_ENDIAN _BIG_ENDIAN
68 #define PDP_ENDIAN _PDP_ENDIAN
69 #define BYTE_ORDER _BYTE_ORDER
70 #endif
71
72 #ifndef __ASSEMBLER__
73 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__)
74 #define __is_constant(x) __builtin_constant_p(x)
75 #else
76 #define __is_constant(x) 0
77 #endif
78
79 #define __bswap16_const(x) (((x) >> 8) | (((x) << 8) & 0xff00))
80 #define __bswap32_const(x) (((x) >> 24) | (((x) >> 8) & 0xff00) | \
81 (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000))
82 #define __bswap64_const(x) (((x) >> 56) | (((x) >> 40) & 0xff00) | \
83 (((x) >> 24) & 0xff0000) | (((x) >> 8) & 0xff000000) | \
84 (((x) << 8) & ((__uint64_t)0xff << 32)) | \
85 (((x) << 24) & ((__uint64_t)0xff << 40)) | \
86 (((x) << 40) & ((__uint64_t)0xff << 48)) | (((x) << 56)))
87
88 static __inline __uint16_t
__bswap16_var(__uint16_t _x)89 __bswap16_var(__uint16_t _x)
90 {
91
92 return ((_x >> 8) | ((_x << 8) & 0xff00));
93 }
94
95 static __inline __uint32_t
__bswap32_var(__uint32_t _x)96 __bswap32_var(__uint32_t _x)
97 {
98
99 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) |
100 ((_x << 24) & 0xff000000));
101 }
102
103 static __inline __uint64_t
__bswap64_var(__uint64_t _x)104 __bswap64_var(__uint64_t _x)
105 {
106
107 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
108 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
109 ((_x << 24) & ((__uint64_t)0xff << 40)) |
110 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
111 }
112
113 #define __bswap16(x) ((__uint16_t)(__is_constant((x)) ? \
114 __bswap16_const((__uint16_t)(x)) : __bswap16_var((__uint16_t)(x))))
115 #define __bswap32(x) ((__uint32_t)(__is_constant((x)) ? \
116 __bswap32_const((__uint32_t)(x)) : __bswap32_var((__uint32_t)(x))))
117 #define __bswap64(x) ((__uint64_t)(__is_constant((x)) ? \
118 __bswap64_const((__uint64_t)(x)) : __bswap64_var((__uint64_t)(x))))
119
120 #ifdef __MIPSEB__
121 #define __htonl(x) ((__uint32_t)(x))
122 #define __htons(x) ((__uint16_t)(x))
123 #define __ntohl(x) ((__uint32_t)(x))
124 #define __ntohs(x) ((__uint16_t)(x))
125 /*
126 * Define the order of 32-bit words in 64-bit words.
127 */
128 /*
129 * XXXMIPS: Additional parentheses to make gcc more happy.
130 */
131 #define _QUAD_HIGHWORD 0
132 #define _QUAD_LOWWORD 1
133 #else
134 #define _QUAD_HIGHWORD 1
135 #define _QUAD_LOWWORD 0
136 #define __ntohl(x) (__bswap32((x)))
137 #define __ntohs(x) (__bswap16((x)))
138 #define __htonl(x) (__bswap32((x)))
139 #define __htons(x) (__bswap16((x)))
140 #endif /* _MIPSEB */
141
142 #endif /* _ASSEMBLER_ */
143
144 #ifdef __cplusplus
145 }
146 #endif
147
148 #endif /* !_MACHINE_ENDIAN_H_ */
149