1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1987, 1991, 1993 5 * The Regents of the University of California. 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. 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. 18 * 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 29 * SUCH DAMAGE. 30 * 31 * @(#)endian.h 8.1 (Berkeley) 6/10/93 32 * $FreeBSD$ 33 */ 34 35 #ifndef _MACHINE_ENDIAN_H_ 36 #define _MACHINE_ENDIAN_H_ 37 38 #include <sys/cdefs.h> 39 #include <sys/_types.h> 40 41 /* 42 * Define the order of 32-bit words in 64-bit words. 43 */ 44 #ifdef __LITTLE_ENDIAN__ 45 #define _QUAD_HIGHWORD 1 46 #define _QUAD_LOWWORD 0 47 #else 48 #define _QUAD_HIGHWORD 0 49 #define _QUAD_LOWWORD 1 50 #endif 51 52 /* 53 * GCC defines _BIG_ENDIAN and _LITTLE_ENDIAN equal to __BIG_ENDIAN__ 54 * and __LITTLE_ENDIAN__ (resp). 55 */ 56 #ifdef _BIG_ENDIAN 57 #undef _BIG_ENDIAN 58 #endif 59 #ifdef _LITTLE_ENDIAN 60 #undef _LITTLE_ENDIAN 61 #endif 62 63 /* 64 * Definitions for byte order, according to byte significance from low 65 * address to high. 66 */ 67 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 68 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 69 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 70 71 #ifdef __LITTLE_ENDIAN__ 72 #define _BYTE_ORDER _LITTLE_ENDIAN 73 #else 74 #define _BYTE_ORDER _BIG_ENDIAN 75 #endif 76 77 /* 78 * Deprecated variants that don't have enough underscores to be useful in more 79 * strict namespaces. 80 */ 81 #if __BSD_VISIBLE 82 #define LITTLE_ENDIAN _LITTLE_ENDIAN 83 #define BIG_ENDIAN _BIG_ENDIAN 84 #define PDP_ENDIAN _PDP_ENDIAN 85 #define BYTE_ORDER _BYTE_ORDER 86 #endif 87 88 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) 89 #define __is_constant(x) __builtin_constant_p(x) 90 #else 91 #define __is_constant(x) 0 92 #endif 93 94 #define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \ 95 (((__uint16_t)(x) << 8) & 0xff00)) 96 #define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \ 97 (((__uint32_t)(x) >> 8) & 0xff00) | \ 98 (((__uint32_t)(x)<< 8) & 0xff0000) | \ 99 (((__uint32_t)(x) << 24) & 0xff000000)) 100 #define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \ 101 (((__uint64_t)(x) >> 40) & 0xff00) | \ 102 (((__uint64_t)(x) >> 24) & 0xff0000) | \ 103 (((__uint64_t)(x) >> 8) & 0xff000000) | \ 104 (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \ 105 (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \ 106 (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \ 107 (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56))) 108 109 static __inline __uint16_t 110 __bswap16_var(__uint16_t _x) 111 { 112 113 return ((_x >> 8) | ((_x << 8) & 0xff00)); 114 } 115 116 static __inline __uint32_t 117 __bswap32_var(__uint32_t _x) 118 { 119 120 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 121 ((_x << 24) & 0xff000000)); 122 } 123 124 static __inline __uint64_t 125 __bswap64_var(__uint64_t _x) 126 { 127 128 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 129 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 130 ((_x << 24) & ((__uint64_t)0xff << 40)) | 131 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 132 } 133 134 #define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \ 135 __bswap16_var(x))) 136 #define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \ 137 __bswap32_var(x)) 138 #define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \ 139 __bswap64_var(x)) 140 141 #ifdef __LITTLE_ENDIAN__ 142 #define __htonl(x) (__bswap32((__uint32_t)(x))) 143 #define __htons(x) (__bswap16((__uint16_t)(x))) 144 #define __ntohl(x) (__bswap32((__uint32_t)(x))) 145 #define __ntohs(x) (__bswap16((__uint16_t)(x))) 146 #else 147 #define __htonl(x) ((__uint32_t)(x)) 148 #define __htons(x) ((__uint16_t)(x)) 149 #define __ntohl(x) ((__uint32_t)(x)) 150 #define __ntohs(x) ((__uint16_t)(x)) 151 #endif 152 153 #endif /* !_MACHINE_ENDIAN_H_ */ 154