2 * Copyright (c) 1987, 1991 Regents of the University of California.
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 * 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.
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
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 $
33 #ifndef _CPU_ENDIAN_H_
34 #define _CPU_ENDIAN_H_
37 #include <sys/cdefs.h>
40 #include <machine/stdint.h>
43 * Define the order of 32-bit words in 64-bit words.
45 #define _QUAD_HIGHWORD 1
46 #define _QUAD_LOWWORD 0
49 * Definitions for byte order, according to byte significance from low
52 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
53 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
54 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
56 #define _BYTE_ORDER _LITTLE_ENDIAN
59 * Deprecated variants that don't have enough underscores to be useful in more
63 #define LITTLE_ENDIAN _LITTLE_ENDIAN
64 #define BIG_ENDIAN _BIG_ENDIAN
65 #define PDP_ENDIAN _PDP_ENDIAN
66 #define BYTE_ORDER _BYTE_ORDER
71 #define __word_swap_int_var(x) \
72 __extension__ ({ register __uint32_t __X = (x); \
73 __asm ("rorl $16, %0" : "+r" (__X)); \
78 #define __word_swap_int_const(x) \
79 ((((x) & 0xffff0000) >> 16) | \
80 (((x) & 0x0000ffff) << 16))
81 #define __word_swap_int(x) (__builtin_constant_p(x) ? \
82 __word_swap_int_const(x) : __word_swap_int_var(x))
84 #else /* __OPTIMIZE__ */
86 #define __word_swap_int(x) __word_swap_int_var(x)
88 #endif /* __OPTIMIZE__ */
90 #define __byte_swap_int_var(x) \
91 __extension__ ({ register __uint32_t __X = (x); \
92 __asm ("bswap %0" : "+r" (__X)); \
97 #define __byte_swap_int_const(x) \
98 ((((x) & 0xff000000) >> 24) | \
99 (((x) & 0x00ff0000) >> 8) | \
100 (((x) & 0x0000ff00) << 8) | \
101 (((x) & 0x000000ff) << 24))
102 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \
103 __byte_swap_int_const(x) : __byte_swap_int_var(x))
105 #else /* __OPTIMIZE__ */
107 #define __byte_swap_int(x) __byte_swap_int_var(x)
109 #endif /* __OPTIMIZE__ */
111 #define __byte_swap_long_var(x) \
112 __extension__ ({ register __uint64_t __X = (x); \
113 __asm ("bswap %0" : "+r" (__X)); \
116 #define __byte_swap_long_const(x) \
118 ((x >> 40) & 0xff00) | \
119 ((x >> 24) & 0xff0000) | \
120 ((x >> 8) & 0xff000000) | \
121 ((x << 8) & ((__uint64_t)0xff << 32)) | \
122 ((x << 24) & ((__uint64_t)0xff << 40)) | \
123 ((x << 40) & ((__uint64_t)0xff << 48)) | \
128 #define __byte_swap_long(x) __byte_swap_long_const(x)
133 #define __byte_swap_long(x) (__builtin_constant_p(x) ? \
134 __byte_swap_long_const(x) : __byte_swap_long_var(x))
135 #else /* __OPTIMIZE__ */
136 #define __byte_swap_long(x) __byte_swap_long_var(x)
137 #endif /* __OPTIMIZE__ */
139 #endif /* __i386__ */
141 #define __byte_swap_word_var(x) \
142 __extension__ ({ register __uint16_t __X = (x); \
143 __asm ("xchgb %h0, %b0" : "+Q" (__X)); \
148 #define __byte_swap_word_const(x) \
149 ((((x) & 0xff00) >> 8) | \
150 (((x) & 0x00ff) << 8))
152 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \
153 __byte_swap_word_const(x) : __byte_swap_word_var(x))
155 #else /* __OPTIMIZE__ */
157 #define __byte_swap_word(x) __byte_swap_word_var(x)
159 #endif /* __OPTIMIZE__ */
161 static __inline __uint64_t
162 __bswap64(__uint64_t _x)
165 return (__byte_swap_long(_x));
168 static __inline __uint32_t
169 __bswap32(__uint32_t _x)
172 return (__byte_swap_int(_x));
175 static __inline __uint16_t
176 __bswap16(__uint16_t _x)
179 return (__byte_swap_word(_x));
182 #define __htonl(x) __bswap32(x)
183 #define __htons(x) __bswap16(x)
184 #define __ntohl(x) __bswap32(x)
185 #define __ntohs(x) __bswap16(x)
187 #else /* !__GNUC__ */
190 * No optimizations are available for this compiler. Fall back to
191 * non-optimized functions by defining the constant usually used to prevent
194 #define _BYTEORDER_FUNC_DEFINED
196 #endif /* __GNUC__ */
198 #endif /* !_CPU_ENDIAN_H_ */