1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2001 David E. O'Brien
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * @(#)endian.h 8.1 (Berkeley) 6/10/93
31 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
32 * $FreeBSD$
33 */
34 /*
35 * Portions copyright (c) 2018, ARM Limited and Contributors.
36 * All rights reserved.
37 */
38
39 #ifndef ENDIAN__H
40 #define ENDIAN__H
41
42 #include <stdint.h>
43
44 /*
45 * Definitions for byte order, according to byte significance from low
46 * address to high.
47 */
48 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
49 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
50 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
51
52 #ifdef __ARMEB__
53 #define _BYTE_ORDER _BIG_ENDIAN
54 #else
55 #define _BYTE_ORDER _LITTLE_ENDIAN
56 #endif /* __ARMEB__ */
57
58 #if __BSD_VISIBLE
59 #define LITTLE_ENDIAN _LITTLE_ENDIAN
60 #define BIG_ENDIAN _BIG_ENDIAN
61 #define PDP_ENDIAN _PDP_ENDIAN
62 #define BYTE_ORDER _BYTE_ORDER
63 #endif
64
65 #ifdef __ARMEB__
66 #define _QUAD_HIGHWORD 0
67 #define _QUAD_LOWWORD 1
68 #define __ntohl(x) ((uint32_t)(x))
69 #define __ntohs(x) ((uint16_t)(x))
70 #define __htonl(x) ((uint32_t)(x))
71 #define __htons(x) ((uint16_t)(x))
72 #else
73 #define _QUAD_HIGHWORD 1
74 #define _QUAD_LOWWORD 0
75 #define __ntohl(x) (__bswap32(x))
76 #define __ntohs(x) (__bswap16(x))
77 #define __htonl(x) (__bswap32(x))
78 #define __htons(x) (__bswap16(x))
79 #endif /* __ARMEB__ */
80
81 static __inline uint64_t
__bswap64(uint64_t _x)82 __bswap64(uint64_t _x)
83 {
84
85 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
86 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((uint64_t)0xff << 32)) |
87 ((_x << 24) & ((uint64_t)0xff << 40)) |
88 ((_x << 40) & ((uint64_t)0xff << 48)) | ((_x << 56)));
89 }
90
91 static __inline uint32_t
__bswap32_var(uint32_t v)92 __bswap32_var(uint32_t v)
93 {
94 uint32_t t1;
95
96 __asm __volatile("eor %1, %0, %0, ror #16\n"
97 "bic %1, %1, #0x00ff0000\n"
98 "mov %0, %0, ror #8\n"
99 "eor %0, %0, %1, lsr #8\n"
100 : "+r" (v), "=r" (t1));
101
102 return (v);
103 }
104
105 static __inline uint16_t
__bswap16_var(uint16_t v)106 __bswap16_var(uint16_t v)
107 {
108 uint32_t ret = v & 0xffff;
109
110 __asm __volatile(
111 "mov %0, %0, ror #8\n"
112 "orr %0, %0, %0, lsr #16\n"
113 "bic %0, %0, %0, lsl #16"
114 : "+r" (ret));
115
116 return ((uint16_t)ret);
117 }
118
119 #ifdef __OPTIMIZE__
120
121 #define __bswap32_constant(x) \
122 ((((x) & 0xff000000U) >> 24) | \
123 (((x) & 0x00ff0000U) >> 8) | \
124 (((x) & 0x0000ff00U) << 8) | \
125 (((x) & 0x000000ffU) << 24))
126
127 #define __bswap16_constant(x) \
128 ((((x) & 0xff00) >> 8) | \
129 (((x) & 0x00ff) << 8))
130
131 #define __bswap16(x) \
132 ((uint16_t)(__builtin_constant_p(x) ? \
133 __bswap16_constant(x) : \
134 __bswap16_var(x)))
135
136 #define __bswap32(x) \
137 ((uint32_t)(__builtin_constant_p(x) ? \
138 __bswap32_constant(x) : \
139 __bswap32_var(x)))
140
141 #else
142 #define __bswap16(x) __bswap16_var(x)
143 #define __bswap32(x) __bswap32_var(x)
144
145 #endif /* __OPTIMIZE__ */
146 #endif /* ENDIAN__H */
147
