Remove i386 support.
[dragonfly.git] / sys / cpu / i386 / include / endian.h
CommitLineData
984263bc 1/*
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2 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
3 *
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4 * Copyright (c) 1987, 1991 Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * from: @(#)endian.h 7.8 (Berkeley) 4/3/91
36 * $FreeBSD: src/sys/i386/include/endian.h,v 1.18 1999/12/29 04:33:01 peter Exp $
4db955e1 37 * $DragonFly: src/sys/cpu/i386/include/endian.h,v 1.8 2007/11/07 17:42:50 dillon Exp $
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38 */
39
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40#ifndef _CPU_ENDIAN_H_
41#define _CPU_ENDIAN_H_
984263bc 42
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43#include <sys/cdefs.h>
44#include <machine/stdint.h>
45
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46/*
47 * Define the order of 32-bit words in 64-bit words.
48 */
49#define _QUAD_HIGHWORD 1
50#define _QUAD_LOWWORD 0
51
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52/*
53 * Definitions for byte order, according to byte significance from low
54 * address to high.
55 */
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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 */
984263bc 59
465a99ae 60#define _BYTE_ORDER _LITTLE_ENDIAN
984263bc 61
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62/*
63 * Deprecated variants that don't have enough underscores to be useful in more
64 * strict namespaces.
65 */
66#if __BSD_VISIBLE
67#define LITTLE_ENDIAN _LITTLE_ENDIAN
68#define BIG_ENDIAN _BIG_ENDIAN
69#define PDP_ENDIAN _PDP_ENDIAN
70#define BYTE_ORDER _BYTE_ORDER
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71#endif
72
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73#define __htonl(x) __bswap32(x)
74#define __htons(x) __bswap16(x)
75#define __ntohl(x) __bswap32(x)
76#define __ntohs(x) __bswap16(x)
77
78#define __byte_swap16_const(x) \
79 ((((x) & 0xff00) >> 8) | \
80 (((x) & 0x00ff) << 8))
81
82#define __byte_swap32_const(x) \
83 ((((x) & 0xff000000) >> 24) | \
84 (((x) & 0x00ff0000) >> 8) | \
85 (((x) & 0x0000ff00) << 8) | \
86 (((x) & 0x000000ff) << 24))
87
88#define __byte_swap64_const(x) \
89 (((x) >> 56) | (((x) >> 40) & 0xff00) | (((x) >> 24) & 0xff0000) | \
90 (((x) >> 8) & 0xff000000) | (((x) << 8) & ((__uint64_t)0xff << 32)) | \
91 (((x) << 24) & ((__uint64_t)0xff << 40)) | \
92 (((x) << 40) & ((__uint64_t)0xff << 48)) | (((x) << 56)))
93
94#if defined(__INTEL_COMPILER)
95# if !defined(__cplusplus) || (defined(__cplusplus) && __INTEL_COMPILER >= 800)
96# define __INTEL_COMPILER_with_DragonFly_endian 1
97# endif
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98#endif
99
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100#if defined(__GNUC__) || defined(__INTEL_COMPILER_with_DragonFly_endian)
101
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102#define __byte_swap32_var(x) \
103 __extension__ ({ register __uint32_t __X = (x); \
104 __asm ("bswap %0" : "+r" (__X)); \
979b64c3 105 __X; })
465a99ae 106
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107#define __byte_swap16_var(x) \
108 __extension__ ({ register __uint16_t __X = (x); \
109 __asm ("xchgb %h0, %b0" : "+q" (__X)); \
110 __X; })
111
112#ifdef __OPTIMIZE__
113
114#define __byte_swap16(x) (__builtin_constant_p(x) ? \
115 __byte_swap16_const(x) : __byte_swap16_var(x))
116
117#define __byte_swap32(x) (__builtin_constant_p(x) ? \
118 __byte_swap32_const(x) : __byte_swap32_var(x))
119
120#else /* __OPTIMIZE__ */
121
122#define __byte_swap16(x) __byte_swap16_var(x)
123#define __byte_swap32(x) __byte_swap32_var(x)
124
125#endif /* __OPTIMIZE__ */
126
127#endif /* __GNUC__ || __INTEL_COMPILER_with_DragonFly_endian */
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128
129/*
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130 * If the compiler-specific part didn't provide this, fallback
131 * to the generic versions.
984263bc 132 */
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133
134#ifndef __byte_swap16
135#define __byte_swap16(x) __byte_swap16_const(x)
136#endif
137
138#ifndef __byte_swap32
139#define __byte_swap32(x) __byte_swap32_const(x)
140#endif
141
142#ifndef __byte_swap64
143#define __byte_swap64(x) __byte_swap64_const(x)
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144#endif
145
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146__BEGIN_DECLS
147
148static __inline __uint16_t
149__bswap16(__uint16_t _x)
150{
151 return (__byte_swap16(_x));
152}
153
154static __inline __uint32_t
155__bswap32(__uint32_t _x)
156{
157 return (__byte_swap32(_x));
158}
984263bc 159
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160static __inline __uint64_t
161__bswap64(__uint64_t _x)
162{
163 return (__byte_swap64(_x));
164}
165
166__END_DECLS
984263bc 167
a9295349 168#endif /* !_CPU_ENDIAN_H_ */