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 * 3. 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: src/sys/amd64/include/endian.h,v 1.5 2003/09/22 22:37:49 peter Exp $
31 */
32
33 #ifndef _CPU_ENDIAN_H_
34 #define _CPU_ENDIAN_H_
35
36 #include <sys/cdefs.h>
37 #include <machine/stdint.h>
38
39 /*
40 * Definitions for byte order, according to byte significance from low
41 * address to high.
42 */
43 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
44 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
45 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
46
47 #define _BYTE_ORDER _LITTLE_ENDIAN
48
49 /*
50 * Deprecated variants that don't have enough underscores to be useful in more
51 * strict namespaces.
52 */
53 #if __BSD_VISIBLE
54 #define LITTLE_ENDIAN _LITTLE_ENDIAN
55 #define BIG_ENDIAN _BIG_ENDIAN
56 #define PDP_ENDIAN _PDP_ENDIAN
57 #define BYTE_ORDER _BYTE_ORDER
58 #endif
59
60 #ifdef __GNUC__
61
62 #define __word_swap_int_var(x) \
63 __extension__ ({ __uint32_t __X = (x); \
64 __asm ("rorl $16, %0" : "+r" (__X)); \
65 __X; })
66
67 #ifdef __OPTIMIZE__
68
69 #define __word_swap_int_const(x) \
70 ((((x) & 0xffff0000) >> 16) | \
71 (((x) & 0x0000ffff) << 16))
72 #define __word_swap_int(x) (__builtin_constant_p(x) ? \
73 __word_swap_int_const(x) : __word_swap_int_var(x))
74
75 #else /* __OPTIMIZE__ */
76
77 #define __word_swap_int(x) __word_swap_int_var(x)
78
79 #endif /* __OPTIMIZE__ */
80
81 #define __byte_swap_int_var(x) \
82 __extension__ ({ __uint32_t __X = (x); \
83 __asm ("bswap %0" : "+r" (__X)); \
84 __X; })
85
86 #ifdef __OPTIMIZE__
87
88 #define __byte_swap_int_const(x) \
89 ((((x) & 0xff000000) >> 24) | \
90 (((x) & 0x00ff0000) >> 8) | \
91 (((x) & 0x0000ff00) << 8) | \
92 (((x) & 0x000000ff) << 24))
93 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \
94 __byte_swap_int_const(x) : __byte_swap_int_var(x))
95
96 #else /* __OPTIMIZE__ */
97
98 #define __byte_swap_int(x) __byte_swap_int_var(x)
99
100 #endif /* __OPTIMIZE__ */
101
102 #define __byte_swap_long_var(x) \
103 __extension__ ({ __uint64_t __X = (x); \
104 __asm ("bswap %0" : "+r" (__X)); \
105 __X; })
106
107 #define __byte_swap_long_const(x) \
108 (((x >> 56) | \
109 ((x >> 40) & 0xff00) | \
110 ((x >> 24) & 0xff0000) | \
111 ((x >> 8) & 0xff000000) | \
112 ((x << 8) & ((__uint64_t)0xff << 32)) | \
113 ((x << 24) & ((__uint64_t)0xff << 40)) | \
114 ((x << 40) & ((__uint64_t)0xff << 48)) | \
115 ((x << 56))))
116
117 #ifdef __i386__
118
119 #define __byte_swap_long(x) __byte_swap_long_const(x)
120
121 #else
122
123 #ifdef __OPTIMIZE__
124 #define __byte_swap_long(x) (__builtin_constant_p(x) ? \
125 __byte_swap_long_const(x) : __byte_swap_long_var(x))
126 #else /* __OPTIMIZE__ */
127 #define __byte_swap_long(x) __byte_swap_long_var(x)
128 #endif /* __OPTIMIZE__ */
129
130 #endif /* __i386__ */
131
132 #define __byte_swap_word_var(x) \
133 __extension__ ({ __uint16_t __X = (x); \
134 __asm ("xchgb %h0, %b0" : "+Q" (__X)); \
135 __X; })
136
137 #ifdef __OPTIMIZE__
138
139 #define __byte_swap_word_const(x) \
140 ((((x) & 0xff00) >> 8) | \
141 (((x) & 0x00ff) << 8))
142
143 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \
144 __byte_swap_word_const(x) : __byte_swap_word_var(x))
145
146 #else /* __OPTIMIZE__ */
147
148 #define __byte_swap_word(x) __byte_swap_word_var(x)
149
150 #endif /* __OPTIMIZE__ */
151
152 static __inline __always_inline __uint64_t
__bswap64(__uint64_t _x)153 __bswap64(__uint64_t _x)
154 {
155 #if __GNUC_PREREQ__(4, 8) && defined(__cplusplus)
156 return (__builtin_bswap64(_x));
157 #else
158 return (__byte_swap_long(_x));
159 #endif
160 }
161
162 static __inline __always_inline __uint32_t
__bswap32(__uint32_t _x)163 __bswap32(__uint32_t _x)
164 {
165 #if __GNUC_PREREQ__(4, 8) && defined(__cplusplus)
166 return (__builtin_bswap32(_x));
167 #else
168 return (__byte_swap_int(_x));
169 #endif
170 }
171
172 static __inline __always_inline __uint16_t
__bswap16(__uint16_t _x)173 __bswap16(__uint16_t _x)
174 {
175 #if __GNUC_PREREQ__(4, 8) && defined(__cplusplus)
176 return (__builtin_bswap16(_x));
177 #else
178 return (__byte_swap_word(_x));
179 #endif
180 }
181
182 #define __htonl(x) __bswap32(x)
183 #define __htons(x) __bswap16(x)
184 #define __ntohl(x) __bswap32(x)
185 #define __ntohs(x) __bswap16(x)
186
187 #else /* !__GNUC__ */
188
189 /*
190 * No optimizations are available for this compiler. Fall back to
191 * non-optimized functions by defining the constant usually used to prevent
192 * redefinition.
193 */
194 #define _BYTEORDER_FUNC_DEFINED
195
196 #endif /* __GNUC__ */
197
198 /*
199 * Userland compatibility double underscore variants to help with DPorts
200 * (injected through <sys/types.h>).
201 */
202 #ifndef _KERNEL
203 #define __LITTLE_ENDIAN _LITTLE_ENDIAN
204 #define __BIG_ENDIAN _BIG_ENDIAN
205 #define __PDP_ENDIAN _PDP_ENDIAN
206 #define __BYTE_ORDER _BYTE_ORDER
207
208 #ifndef __FLOAT_WORD_ORDER
209 #define __FLOAT_WORD_ORDER __BYTE_ORDER
210 #endif
211 #endif /* !_KERNEL */
212
213 #endif /* !_CPU_ENDIAN_H_ */
214