2 * Copyright (c) 1987, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
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 * 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.
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 8.1 (Berkeley) 6/10/93
30 * $NetBSD: endian.h,v 1.5 1997/10/09 15:42:19 bouyer Exp $
34 #ifndef _MACHINE_ENDIAN_H_
35 #define _MACHINE_ENDIAN_H_
37 #include <sys/cdefs.h>
38 #include <sys/_types.h>
41 * Define the order of 32-bit words in 64-bit words.
43 #define _QUAD_HIGHWORD 1
44 #define _QUAD_LOWWORD 0
47 * Definitions for byte order, according to byte significance from low
50 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
51 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
52 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
54 #define _BYTE_ORDER _LITTLE_ENDIAN
57 * Deprecated variants that don't have enough underscores to be useful in more
61 #define LITTLE_ENDIAN _LITTLE_ENDIAN
62 #define BIG_ENDIAN _BIG_ENDIAN
63 #define PDP_ENDIAN _PDP_ENDIAN
64 #define BYTE_ORDER _BYTE_ORDER
67 #if defined(__CC_SUPPORTS___INLINE) && defined(__GNUCLIKE_ASM)
69 static __inline __uint64_t
70 __bswap64(__uint64_t _x)
74 __asm __volatile("mux1 %0=%1,@rev"
75 : "=r" (__r) : "r"(_x));
79 static __inline __uint32_t
80 __bswap32(__uint32_t _x)
83 return (__bswap64(_x) >> 32);
86 static __inline __uint16_t
87 __bswap16(__uint16_t _x)
90 return (__bswap64(_x) >> 48);
93 #define __htonl(x) __bswap32(x)
94 #define __htons(x) __bswap16(x)
95 #define __ntohl(x) __bswap32(x)
96 #define __ntohs(x) __bswap16(x)
98 #else /* !(__CC_SUPPORTS___INLINE && __GNUCLIKE_ASM) */
101 * No optimizations are available for this compiler. Fall back to
102 * non-optimized functions by defining the constant usually used to prevent
105 #define _BYTEORDER_FUNC_DEFINED
107 #endif /* __CC_SUPPORTS___INLINE && __GNUCLIKE_ASM */
109 #endif /* !_MACHINE_ENDIAN_H_ */