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 #include <sys/_types.h>
38
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42
43 /*
44 * Define the order of 32-bit words in 64-bit words.
45 */
46 #define _QUAD_HIGHWORD 1
47 #define _QUAD_LOWWORD 0
48
49 /*
50 * Definitions for byte order, according to byte significance from low
51 * address to high.
52 */
53 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
54 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
55 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
56
57 #define _BYTE_ORDER _LITTLE_ENDIAN
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 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE_BUILTIN_CONSTANT_P)
71
72 #define __byte_swap_int_var(x) \
73 __extension__ ({ register __uint32_t __X = (x); \
74 __asm ("bswap %0" : "+r" (__X)); \
75 __X; })
76
77 #ifdef __OPTIMIZE__
78
79 #define __byte_swap_int_const(x) \
80 ((((x) & 0xff000000) >> 24) | \
81 (((x) & 0x00ff0000) >> 8) | \
82 (((x) & 0x0000ff00) << 8) | \
83 (((x) & 0x000000ff) << 24))
84 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \
85 __byte_swap_int_const(x) : __byte_swap_int_var(x))
86
87 #else /* __OPTIMIZE__ */
88
89 #define __byte_swap_int(x) __byte_swap_int_var(x)
90
91 #endif /* __OPTIMIZE__ */
92
93 static __inline __uint64_t
94 __bswap64(__uint64_t _x)
95 {
96
97 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
98 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
99 ((_x << 24) & ((__uint64_t)0xff << 40)) |
100 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
101 }
102
103 static __inline __uint32_t
104 __bswap32(__uint32_t _x)
105 {
106
107 return (__byte_swap_int(_x));
108 }
109
110 static __inline __uint16_t
111 __bswap16(__uint16_t _x)
112 {
113 return (_x << 8 | _x >> 8);
114 }
115
116 #define __htonl(x) __bswap32(x)
117 #define __htons(x) __bswap16(x)
118 #define __ntohl(x) __bswap32(x)
119 #define __ntohs(x) __bswap16(x)
120
121 #else /* !(__GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P) */
122
123 /*
124 * No optimizations are available for this compiler. Fall back to
125 * non-optimized functions by defining the constant usually used to prevent
126 * redefinition.
127 */
128 #define _BYTEORDER_FUNC_DEFINED
129
130 #endif /* __GNUCLIKE_ASM && __GNUCLIKE_BUILTIN_CONSTANT_P */
131
132 #ifdef __cplusplus
133 }
134 #endif
135
136 #endif /* !_MACHINE_ENDIAN_H_ */
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