2 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
4 * Copyright (c) 1987, 1991 Regents of the University of California.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * from: @(#)endian.h 7.8 (Berkeley) 4/3/91
32 * $FreeBSD: src/sys/i386/include/endian.h,v 1.18 1999/12/29 04:33:01 peter Exp $
35 #ifndef _CPU_ENDIAN_H_
36 #define _CPU_ENDIAN_H_
38 #include <sys/cdefs.h>
39 #include <machine/stdint.h>
42 * Define the order of 32-bit words in 64-bit words.
44 #define _QUAD_HIGHWORD 1
45 #define _QUAD_LOWWORD 0
48 * Definitions for byte order, according to byte significance from low
51 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
52 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
53 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
55 #define _BYTE_ORDER _LITTLE_ENDIAN
58 * Deprecated variants that don't have enough underscores to be useful in more
62 #define LITTLE_ENDIAN _LITTLE_ENDIAN
63 #define BIG_ENDIAN _BIG_ENDIAN
64 #define PDP_ENDIAN _PDP_ENDIAN
65 #define BYTE_ORDER _BYTE_ORDER
68 #define __htonl(x) __bswap32(x)
69 #define __htons(x) __bswap16(x)
70 #define __ntohl(x) __bswap32(x)
71 #define __ntohs(x) __bswap16(x)
73 #define __byte_swap16_const(x) \
74 ((((x) & 0xff00) >> 8) | \
75 (((x) & 0x00ff) << 8))
77 #define __byte_swap32_const(x) \
78 ((((x) & 0xff000000) >> 24) | \
79 (((x) & 0x00ff0000) >> 8) | \
80 (((x) & 0x0000ff00) << 8) | \
81 (((x) & 0x000000ff) << 24))
83 #define __byte_swap64_const(x) \
84 (((x) >> 56) | (((x) >> 40) & 0xff00) | (((x) >> 24) & 0xff0000) | \
85 (((x) >> 8) & 0xff000000) | (((x) << 8) & ((__uint64_t)0xff << 32)) | \
86 (((x) << 24) & ((__uint64_t)0xff << 40)) | \
87 (((x) << 40) & ((__uint64_t)0xff << 48)) | (((x) << 56)))
89 #if defined(__INTEL_COMPILER)
90 # if !defined(__cplusplus) || (defined(__cplusplus) && __INTEL_COMPILER >= 800)
91 # define __INTEL_COMPILER_with_DragonFly_endian 1
95 #if defined(__GNUC__) || defined(__INTEL_COMPILER_with_DragonFly_endian)
97 #define __byte_swap32_var(x) \
98 __extension__ ({ register __uint32_t __X = (x); \
99 __asm ("bswap %0" : "+r" (__X)); \
102 #define __byte_swap16_var(x) \
103 __extension__ ({ register __uint16_t __X = (x); \
104 __asm ("xchgb %h0, %b0" : "+q" (__X)); \
109 #define __byte_swap16(x) (__builtin_constant_p(x) ? \
110 __byte_swap16_const(x) : __byte_swap16_var(x))
112 #define __byte_swap32(x) (__builtin_constant_p(x) ? \
113 __byte_swap32_const(x) : __byte_swap32_var(x))
115 #else /* __OPTIMIZE__ */
117 #define __byte_swap16(x) __byte_swap16_var(x)
118 #define __byte_swap32(x) __byte_swap32_var(x)
120 #endif /* __OPTIMIZE__ */
122 #endif /* __GNUC__ || __INTEL_COMPILER_with_DragonFly_endian */
125 * If the compiler-specific part didn't provide this, fallback
126 * to the generic versions.
129 #ifndef __byte_swap16
130 #define __byte_swap16(x) __byte_swap16_const(x)
133 #ifndef __byte_swap32
134 #define __byte_swap32(x) __byte_swap32_const(x)
137 #ifndef __byte_swap64
138 #define __byte_swap64(x) __byte_swap64_const(x)
143 static __inline __uint16_t
144 __bswap16(__uint16_t _x)
146 return (__byte_swap16(_x));
149 static __inline __uint32_t
150 __bswap32(__uint32_t _x)
152 return (__byte_swap32(_x));
155 static __inline __uint64_t
156 __bswap64(__uint64_t _x)
158 return (__byte_swap64(_x));
163 #endif /* !_CPU_ENDIAN_H_ */