1 /*-
2 * Copyright (c) 2001 David E. O'Brien
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 *
28 * @(#)endian.h 8.1 (Berkeley) 6/10/93
29 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
30 * $FreeBSD: src/sys/arm/include/endian.h,v 1.12 2008/08/23 23:35:08 imp Exp $
31 */
32
33 #ifndef _ENDIAN_H_
34 #define _ENDIAN_H_
35
36 #include <sys/_types.h>
37
38 /*
39 * Definitions for byte order, according to byte significance from low
40 * address to high.
41 */
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 */
45
46 #ifdef __ARMEB__
47 #define _BYTE_ORDER _BIG_ENDIAN
48 #else
49 #define _BYTE_ORDER _LITTLE_ENDIAN
50 #endif /* __ARMEB__ */
51
52 #if __BSD_VISIBLE
53 #define LITTLE_ENDIAN _LITTLE_ENDIAN
54 #define BIG_ENDIAN _BIG_ENDIAN
55 #define PDP_ENDIAN _PDP_ENDIAN
56 #define BYTE_ORDER _BYTE_ORDER
57 #endif
58
59 #ifdef __ARMEB__
60 #define _QUAD_HIGHWORD 0
61 #define _QUAD_LOWWORD 1
62 #define __ntohl(x) ((__uint32_t)(x))
63 #define __ntohs(x) ((__uint16_t)(x))
64 #define __htonl(x) ((__uint32_t)(x))
65 #define __htons(x) ((__uint16_t)(x))
66 #else
67 #define _QUAD_HIGHWORD 1
68 #define _QUAD_LOWWORD 0
69 #define __ntohl(x) (__bswap32(x))
70 #define __ntohs(x) (__bswap16(x))
71 #define __htonl(x) (__bswap32(x))
72 #define __htons(x) (__bswap16(x))
73 #endif /* __ARMEB__ */
74
75 static __inline __uint64_t
76 __bswap64(__uint64_t _x)
77 {
78
79 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
80 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
81 ((_x << 24) & ((__uint64_t)0xff << 40)) |
82 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
83 }
84
85 static __inline __uint32_t
86 __bswap32_var(__uint32_t v)
87 {
88 __uint32_t t1;
89
90 __asm __volatile("eor %1, %0, %0, ror #16\n"
91 "bic %1, %1, #0x00ff0000\n"
92 "mov %0, %0, ror #8\n"
93 "eor %0, %0, %1, lsr #8\n"
94 : "+r" (v), "=r" (t1));
95
96 return (v);
97 }
98
99 static __inline __uint16_t
100 __bswap16_var(__uint16_t v)
101 {
102 __uint32_t ret = v & 0xffff;
103
104 __asm __volatile(
105 "mov %0, %0, ror #8\n"
106 "orr %0, %0, %0, lsr #16\n"
107 "bic %0, %0, %0, lsl #16"
108 : "+r" (ret));
109
110 return ((__uint16_t)ret);
111 }
112
113 #ifdef __OPTIMIZE__
114
115 #define __bswap32_constant(x) \
116 ((((x) & 0xff000000U) >> 24) | \
117 (((x) & 0x00ff0000U) >> 8) | \
118 (((x) & 0x0000ff00U) << 8) | \
119 (((x) & 0x000000ffU) << 24))
120
121 #define __bswap16_constant(x) \
122 ((((x) & 0xff00) >> 8) | \
123 (((x) & 0x00ff) << 8))
124
125 #define __bswap16(x) \
126 ((__uint16_t)(__builtin_constant_p(x) ? \
127 __bswap16_constant(x) : \
128 __bswap16_var(x)))
129
130 #define __bswap32(x) \
131 ((__uint32_t)(__builtin_constant_p(x) ? \
132 __bswap32_constant(x) : \
133 __bswap32_var(x)))
134
135 #else
136 #define __bswap16(x) __bswap16_var(x)
137 #define __bswap32(x) __bswap32_var(x)
138
139 #endif /* __OPTIMIZE__ */
140 #endif /* !_ENDIAN_H_ */
141 Cache object: 47d9489d8ceab232dbd2ceb3325bb024
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