1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 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. 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 32 #ifndef _SYS__ENDIAN_H_ 33 #define _SYS__ENDIAN_H_ 34 35 #if !defined(_MACHINE_ENDIAN_H_) && !defined(_BYTESWAP_H_) && !defined(_ENDIAN_H_) 36 #error "sys/_endian.h should not be included directly" 37 #endif 38 39 /* BSD Compatiblity */ 40 #define _BYTE_ORDER __BYTE_ORDER__ 41 42 /* 43 * Definitions for byte order, according to byte significance from low 44 * address to high. 45 */ 46 #define _LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__ /* LSB first: 1234 */ 47 #define _BIG_ENDIAN __ORDER_BIG_ENDIAN__ /* MSB first: 4321 */ 48 #define _PDP_ENDIAN __ORDER_PDP_ENDIAN__ /* LSB first in word, 49 * MSW first in long: 3412 */ 50 51 /* 52 * Define the order of 32-bit words in 64-bit words. 53 */ 54 #if _BYTE_ORDER == _LITTLE_ENDIAN 55 #define _QUAD_HIGHWORD 1 56 #define _QUAD_LOWWORD 0 57 #elif _BYTE_ORDER == _BIG_ENDIAN 58 #define _QUAD_HIGHWORD 0 59 #define _QUAD_LOWWORD 1 60 #else 61 #error "Unsupported endian" 62 #endif 63 64 /* 65 * Deprecated variants that don't have enough underscores to be useful in more 66 * strict namespaces. 67 */ 68 #if __BSD_VISIBLE 69 #define LITTLE_ENDIAN _LITTLE_ENDIAN 70 #define BIG_ENDIAN _BIG_ENDIAN 71 #define PDP_ENDIAN _PDP_ENDIAN 72 #define BYTE_ORDER _BYTE_ORDER 73 #endif 74 75 /* bswap primitives, based on compiler builtins */ 76 #define __bswap16(x) __builtin_bswap16(x) 77 #define __bswap32(x) __builtin_bswap32(x) 78 #define __bswap64(x) __builtin_bswap64(x) 79 80 #if _BYTE_ORDER == _LITTLE_ENDIAN 81 #define __ntohl(x) (__bswap32(x)) 82 #define __ntohs(x) (__bswap16(x)) 83 #define __htonl(x) (__bswap32(x)) 84 #define __htons(x) (__bswap16(x)) 85 #elif _BYTE_ORDER == _BIG_ENDIAN 86 #define __htonl(x) ((__uint32_t)(x)) 87 #define __htons(x) ((__uint16_t)(x)) 88 #define __ntohl(x) ((__uint32_t)(x)) 89 #define __ntohs(x) ((__uint16_t)(x)) 90 #endif 91 92 /* 93 * Host to big endian, host to little endian, big endian to host, and little 94 * endian to host byte order functions as detailed in byteorder(9). 95 */ 96 #if _BYTE_ORDER == _LITTLE_ENDIAN 97 #define htobe16(x) __bswap16((x)) 98 #define htobe32(x) __bswap32((x)) 99 #define htobe64(x) __bswap64((x)) 100 #define htole16(x) ((uint16_t)(x)) 101 #define htole32(x) ((uint32_t)(x)) 102 #define htole64(x) ((uint64_t)(x)) 103 104 #define be16toh(x) __bswap16((x)) 105 #define be32toh(x) __bswap32((x)) 106 #define be64toh(x) __bswap64((x)) 107 #define le16toh(x) ((uint16_t)(x)) 108 #define le32toh(x) ((uint32_t)(x)) 109 #define le64toh(x) ((uint64_t)(x)) 110 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 111 #define htobe16(x) ((uint16_t)(x)) 112 #define htobe32(x) ((uint32_t)(x)) 113 #define htobe64(x) ((uint64_t)(x)) 114 #define htole16(x) __bswap16((x)) 115 #define htole32(x) __bswap32((x)) 116 #define htole64(x) __bswap64((x)) 117 118 #define be16toh(x) ((uint16_t)(x)) 119 #define be32toh(x) ((uint32_t)(x)) 120 #define be64toh(x) ((uint64_t)(x)) 121 #define le16toh(x) __bswap16((x)) 122 #define le32toh(x) __bswap32((x)) 123 #define le64toh(x) __bswap64((x)) 124 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 125 126 #endif /* _SYS__ENDIAN_H_ */ 127