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
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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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 $
35 * $DragonFly: src/sys/amd64/include/Attic/endian.h,v 1.1 2004/02/02 08:05:52 dillon Exp $
38 #ifndef _MACHINE_ENDIAN_H_
39 #define _MACHINE_ENDIAN_H_
42 #include <sys/cdefs.h>
45 #ifndef _MACHINE_STDINT_H_
46 #include <machine/stdint.h>
50 * Define the order of 32-bit words in 64-bit words.
52 #define _QUAD_HIGHWORD 1
53 #define _QUAD_LOWWORD 0
56 * Definitions for byte order, according to byte significance from low
59 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
60 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
61 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
63 #define _BYTE_ORDER _LITTLE_ENDIAN
66 * Deprecated variants that don't have enough underscores to be useful in more
70 #define LITTLE_ENDIAN _LITTLE_ENDIAN
71 #define BIG_ENDIAN _BIG_ENDIAN
72 #define PDP_ENDIAN _PDP_ENDIAN
73 #define BYTE_ORDER _BYTE_ORDER
78 #define __word_swap_int_var(x) \
79 __extension__ ({ register __uint32_t __X = (x); \
80 __asm ("rorl $16, %0" : "+r" (__X)); \
85 #define __word_swap_int_const(x) \
86 ((((x) & 0xffff0000) >> 16) | \
87 (((x) & 0x0000ffff) << 16))
88 #define __word_swap_int(x) (__builtin_constant_p(x) ? \
89 __word_swap_int_const(x) : __word_swap_int_var(x))
91 #else /* __OPTIMIZE__ */
93 #define __word_swap_int(x) __word_swap_int_var(x)
95 #endif /* __OPTIMIZE__ */
97 #define __byte_swap_int_var(x) \
98 __extension__ ({ register __uint32_t __X = (x); \
99 __asm ("bswap %0" : "+r" (__X)); \
104 #define __byte_swap_int_const(x) \
105 ((((x) & 0xff000000) >> 24) | \
106 (((x) & 0x00ff0000) >> 8) | \
107 (((x) & 0x0000ff00) << 8) | \
108 (((x) & 0x000000ff) << 24))
109 #define __byte_swap_int(x) (__builtin_constant_p(x) ? \
110 __byte_swap_int_const(x) : __byte_swap_int_var(x))
112 #else /* __OPTIMIZE__ */
114 #define __byte_swap_int(x) __byte_swap_int_var(x)
116 #endif /* __OPTIMIZE__ */
118 #define __byte_swap_long_var(x) \
119 __extension__ ({ register __uint64_t __X = (x); \
120 __asm ("bswap %0" : "+r" (__X)); \
125 #define __byte_swap_long_const(x) \
127 ((x >> 40) & 0xff00) | \
128 ((x >> 24) & 0xff0000) | \
129 ((x >> 8) & 0xff000000) | \
130 ((x << 8) & (0xfful << 32)) | \
131 ((x << 24) & (0xfful << 40)) | \
132 ((x << 40) & (0xfful << 48)) | \
135 #define __byte_swap_long(x) (__builtin_constant_p(x) ? \
136 __byte_swap_long_const(x) : __byte_swap_long_var(x))
138 #else /* __OPTIMIZE__ */
140 #define __byte_swap_long(x) __byte_swap_long_var(x)
142 #endif /* __OPTIMIZE__ */
144 #define __byte_swap_word_var(x) \
145 __extension__ ({ register __uint16_t __X = (x); \
146 __asm ("xchgb %h0, %b0" : "+Q" (__X)); \
151 #define __byte_swap_word_const(x) \
152 ((((x) & 0xff00) >> 8) | \
153 (((x) & 0x00ff) << 8))
155 #define __byte_swap_word(x) (__builtin_constant_p(x) ? \
156 __byte_swap_word_const(x) : __byte_swap_word_var(x))
158 #else /* __OPTIMIZE__ */
160 #define __byte_swap_word(x) __byte_swap_word_var(x)
162 #endif /* __OPTIMIZE__ */
164 static __inline __uint64_t
165 __bswap64(__uint64_t _x)
168 return (__byte_swap_long(_x));
171 static __inline __uint32_t
172 __bswap32(__uint32_t _x)
175 return (__byte_swap_int(_x));
178 static __inline __uint16_t
179 __bswap16(__uint16_t _x)
182 return (__byte_swap_word(_x));
185 #define __htonl(x) __bswap32(x)
186 #define __htons(x) __bswap16(x)
187 #define __ntohl(x) __bswap32(x)
188 #define __ntohs(x) __bswap16(x)
190 #else /* !__GNUC__ */
193 * No optimizations are available for this compiler. Fall back to
194 * non-optimized functions by defining the constant usually used to prevent
197 #define _BYTEORDER_FUNC_DEFINED
199 #endif /* __GNUC__ */
201 #endif /* !_MACHINE_ENDIAN_H_ */