2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2001 David E. O'Brien
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
30 * @(#)endian.h 8.1 (Berkeley) 6/10/93
31 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $
38 #include <sys/_types.h>
41 * Definitions for byte order, according to byte significance from low
44 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
45 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
46 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
49 #define _BYTE_ORDER _BIG_ENDIAN
51 #define _BYTE_ORDER _LITTLE_ENDIAN
52 #endif /* __ARMEB__ */
55 #define LITTLE_ENDIAN _LITTLE_ENDIAN
56 #define BIG_ENDIAN _BIG_ENDIAN
57 #define PDP_ENDIAN _PDP_ENDIAN
58 #define BYTE_ORDER _BYTE_ORDER
62 #define _QUAD_HIGHWORD 0
63 #define _QUAD_LOWWORD 1
64 #define __ntohl(x) ((__uint32_t)(x))
65 #define __ntohs(x) ((__uint16_t)(x))
66 #define __htonl(x) ((__uint32_t)(x))
67 #define __htons(x) ((__uint16_t)(x))
69 #define _QUAD_HIGHWORD 1
70 #define _QUAD_LOWWORD 0
71 #define __ntohl(x) (__bswap32(x))
72 #define __ntohs(x) (__bswap16(x))
73 #define __htonl(x) (__bswap32(x))
74 #define __htons(x) (__bswap16(x))
75 #endif /* __ARMEB__ */
77 static __inline __uint64_t
78 __bswap64(__uint64_t _x)
81 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) |
82 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) |
83 ((_x << 24) & ((__uint64_t)0xff << 40)) |
84 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56)));
87 static __inline __uint32_t
88 __bswap32_var(__uint32_t v)
92 __asm __volatile("eor %1, %0, %0, ror #16\n"
93 "bic %1, %1, #0x00ff0000\n"
94 "mov %0, %0, ror #8\n"
95 "eor %0, %0, %1, lsr #8\n"
96 : "+r" (v), "=r" (t1));
101 static __inline __uint16_t
102 __bswap16_var(__uint16_t v)
104 __uint32_t ret = v & 0xffff;
107 "mov %0, %0, ror #8\n"
108 "orr %0, %0, %0, lsr #16\n"
109 "bic %0, %0, %0, lsl #16"
112 return ((__uint16_t)ret);
117 #define __bswap32_constant(x) \
118 ((((x) & 0xff000000U) >> 24) | \
119 (((x) & 0x00ff0000U) >> 8) | \
120 (((x) & 0x0000ff00U) << 8) | \
121 (((x) & 0x000000ffU) << 24))
123 #define __bswap16_constant(x) \
124 ((((x) & 0xff00) >> 8) | \
125 (((x) & 0x00ff) << 8))
127 #define __bswap16(x) \
128 ((__uint16_t)(__builtin_constant_p(x) ? \
129 __bswap16_constant(x) : \
132 #define __bswap32(x) \
133 ((__uint32_t)(__builtin_constant_p(x) ? \
134 __bswap32_constant(x) : \
138 #define __bswap16(x) __bswap16_var(x)
139 #define __bswap32(x) __bswap32_var(x)
141 #endif /* __OPTIMIZE__ */
142 #endif /* !_ENDIAN_H_ */