2 * Copyright (c) 2001 David E. O'Brien
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the University nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * @(#)endian.h 8.1 (Berkeley) 6/10/93
29 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
33 #ifndef _MACHINE_ENDIAN_H_
34 #define _MACHINE_ENDIAN_H_
36 #include <sys/_types.h>
39 * Definitions for byte order, according to byte significance from low
42 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
43 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
44 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
46 #define _BYTE_ORDER _LITTLE_ENDIAN
49 #define LITTLE_ENDIAN _LITTLE_ENDIAN
50 #define BIG_ENDIAN _BIG_ENDIAN
51 #define PDP_ENDIAN _PDP_ENDIAN
52 #define BYTE_ORDER _BYTE_ORDER
55 #define _QUAD_HIGHWORD 1
56 #define _QUAD_LOWWORD 0
57 #define __ntohl(x) (__bswap32(x))
58 #define __ntohs(x) (__bswap16(x))
59 #define __htonl(x) (__bswap32(x))
60 #define __htons(x) (__bswap16(x))
62 static __inline __uint64_t
63 __bswap64(__uint64_t x)
67 __asm __volatile("rev %0, %1\n"
68 : "=&r" (ret), "+r" (x));
73 static __inline __uint32_t
74 __bswap32_var(__uint32_t v)
78 __asm __volatile("rev32 %x0, %x1\n"
79 : "=&r" (ret), "+r" (v));
84 static __inline __uint16_t
85 __bswap16_var(__uint16_t v)
89 __asm __volatile("rev16 %w0, %w1\n"
90 : "=&r" (ret), "+r" (v));
92 return ((__uint16_t)ret);
97 #define __bswap32_constant(x) \
98 ((((x) & 0xff000000U) >> 24) | \
99 (((x) & 0x00ff0000U) >> 8) | \
100 (((x) & 0x0000ff00U) << 8) | \
101 (((x) & 0x000000ffU) << 24))
103 #define __bswap16_constant(x) \
104 ((((x) & 0xff00) >> 8) | \
105 (((x) & 0x00ff) << 8))
107 #define __bswap16(x) \
108 ((__uint16_t)(__builtin_constant_p(x) ? \
109 __bswap16_constant((__uint16_t)(x)) : \
112 #define __bswap32(x) \
113 ((__uint32_t)(__builtin_constant_p(x) ? \
114 __bswap32_constant((__uint32_t)(x)) : \
118 #define __bswap16(x) __bswap16_var(x)
119 #define __bswap32(x) __bswap32_var(x)
121 #endif /* __OPTIMIZE__ */
122 #endif /* !_MACHINE_ENDIAN_H_ */