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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)endian.h 7.8 (Berkeley) 4/3/91
34 * $FreeBSD: src/sys/amd64/include/endian.h,v 1.5 2003/09/22 22:37:49 peter Exp $
37 #ifndef _CPU_ENDIAN_H_
38 #define _CPU_ENDIAN_H_
41 #include <sys/cdefs.h>
44 #include <machine/stdint.h>
47 * Define the order of 32-bit words in 64-bit words.
49 #define _QUAD_HIGHWORD 1
50 #define _QUAD_LOWWORD 0
53 * Definitions for byte order, according to byte significance from low
56 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
57 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
58 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
60 #define _BYTE_ORDER _LITTLE_ENDIAN
63 * Deprecated variants that don't have enough underscores to be useful in more
67 #define LITTLE_ENDIAN _LITTLE_ENDIAN
68 #define BIG_ENDIAN _BIG_ENDIAN
69 #define PDP_ENDIAN _PDP_ENDIAN
70 #define BYTE_ORDER _BYTE_ORDER
75 #define __word_swap_int_var(x) \
76 __extension__ ({ register __uint32_t __X = (x); \
77 __asm ("rorl $16, %0" : "+r" (__X)); \
82 #define __word_swap_int_const(x) \
83 ((((x) & 0xffff0000) >> 16) | \
84 (((x) & 0x0000ffff) << 16))
85 #define __word_swap_int(x) (__builtin_constant_p(x) ? \
86 __word_swap_int_const(x) : __word_swap_int_var(x))
88 #else /* __OPTIMIZE__ */
90 #define __word_swap_int(x) __word_swap_int_var(x)
92 #endif /* __OPTIMIZE__ */
94 #define __byte_swap_int_var(x) \
95 __extension__ ({ register __uint32_t __X = (x); \
96 __asm ("bswap %0" : "+r" (__X)); \
101 #define __byte_swap_int_const(x) \
102 ((((x) & 0xff000000) >> 24) | \
103 (((x) & 0x00ff0000) >> 8) | \
104 (((x) & 0x0000ff00) << 8) | \
105 (((x) & 0x000000ff) << 24))
106 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \
107 __byte_swap_int_const(x) : __byte_swap_int_var(x))
109 #else /* __OPTIMIZE__ */
111 #define __byte_swap_int(x) __byte_swap_int_var(x)
113 #endif /* __OPTIMIZE__ */
115 #define __byte_swap_long_var(x) \
116 __extension__ ({ register __uint64_t __X = (x); \
117 __asm ("bswap %0" : "+r" (__X)); \
120 #define __byte_swap_long_const(x) \
122 ((x >> 40) & 0xff00) | \
123 ((x >> 24) & 0xff0000) | \
124 ((x >> 8) & 0xff000000) | \
125 ((x << 8) & ((__uint64_t)0xff << 32)) | \
126 ((x << 24) & ((__uint64_t)0xff << 40)) | \
127 ((x << 40) & ((__uint64_t)0xff << 48)) | \
132 #define __byte_swap_long(x) __byte_swap_long_const(x)
137 #define __byte_swap_long(x) (__builtin_constant_p(x) ? \
138 __byte_swap_long_const(x) : __byte_swap_long_var(x))
139 #else /* __OPTIMIZE__ */
140 #define __byte_swap_long(x) __byte_swap_long_var(x)
141 #endif /* __OPTIMIZE__ */
143 #endif /* __i386__ */
145 #define __byte_swap_word_var(x) \
146 __extension__ ({ register __uint16_t __X = (x); \
147 __asm ("xchgb %h0, %b0" : "+Q" (__X)); \
152 #define __byte_swap_word_const(x) \
153 ((((x) & 0xff00) >> 8) | \
154 (((x) & 0x00ff) << 8))
156 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \
157 __byte_swap_word_const(x) : __byte_swap_word_var(x))
159 #else /* __OPTIMIZE__ */
161 #define __byte_swap_word(x) __byte_swap_word_var(x)
163 #endif /* __OPTIMIZE__ */
165 static __inline __uint64_t
166 __bswap64(__uint64_t _x)
169 return (__byte_swap_long(_x));
172 static __inline __uint32_t
173 __bswap32(__uint32_t _x)
176 return (__byte_swap_int(_x));
179 static __inline __uint16_t
180 __bswap16(__uint16_t _x)
183 return (__byte_swap_word(_x));
186 #define __htonl(x) __bswap32(x)
187 #define __htons(x) __bswap16(x)
188 #define __ntohl(x) __bswap32(x)
189 #define __ntohs(x) __bswap16(x)
191 #else /* !__GNUC__ */
194 * No optimizations are available for this compiler. Fall back to
195 * non-optimized functions by defining the constant usually used to prevent
198 #define _BYTEORDER_FUNC_DEFINED
200 #endif /* __GNUC__ */
202 #endif /* !_CPU_ENDIAN_H_ */