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 #include <sys/cdefs.h> /* visibility macros */ 40 41 /* BSD Compatiblity */ 42 #define _BYTE_ORDER __BYTE_ORDER__ 43 44 /* 45 * Definitions for byte order, according to byte significance from low 46 * address to high. We undefine any prior definition of them because 47 * powerpc compilers define _LITTLE_ENDIAN and _BIG_ENDIAN to mean 48 * something else. 49 */ 50 #undef _LITTLE_ENDIAN 51 #define _LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__ /* LSB first: 1234 */ 52 #undef _BIG_ENDIAN 53 #define _BIG_ENDIAN __ORDER_BIG_ENDIAN__ /* MSB first: 4321 */ 54 #define _PDP_ENDIAN __ORDER_PDP_ENDIAN__ /* LSB first in word, 55 * MSW first in long: 3412 */ 56 57 /* 58 * Define the order of 32-bit words in 64-bit words. 59 */ 60 #if _BYTE_ORDER == _LITTLE_ENDIAN 61 #define _QUAD_HIGHWORD 1 62 #define _QUAD_LOWWORD 0 63 #elif _BYTE_ORDER == _BIG_ENDIAN 64 #define _QUAD_HIGHWORD 0 65 #define _QUAD_LOWWORD 1 66 #else 67 #error "Unsupported endian" 68 #endif 69 70 /* 71 * POSIX Issue 8 will require these for endian.h. Define them there and in the 72 * traditional BSD compilation environment. Since issue 8 doesn't yet have an 73 * assigned date, use strictly greater than issue 7's date. 74 */ 75 #if __BSD_VISIBLE || _POSIX_C_SOURCE > 200809 76 #define LITTLE_ENDIAN _LITTLE_ENDIAN 77 #define BIG_ENDIAN _BIG_ENDIAN 78 #define PDP_ENDIAN _PDP_ENDIAN 79 #define BYTE_ORDER _BYTE_ORDER 80 #endif 81 82 /* bswap primitives, based on compiler builtins */ 83 #define __bswap16(x) __builtin_bswap16(x) 84 #define __bswap32(x) __builtin_bswap32(x) 85 #define __bswap64(x) __builtin_bswap64(x) 86 87 #if _BYTE_ORDER == _LITTLE_ENDIAN 88 #define __ntohl(x) (__bswap32(x)) 89 #define __ntohs(x) (__bswap16(x)) 90 #define __htonl(x) (__bswap32(x)) 91 #define __htons(x) (__bswap16(x)) 92 #elif _BYTE_ORDER == _BIG_ENDIAN 93 #define __htonl(x) ((__uint32_t)(x)) 94 #define __htons(x) ((__uint16_t)(x)) 95 #define __ntohl(x) ((__uint32_t)(x)) 96 #define __ntohs(x) ((__uint16_t)(x)) 97 #endif 98 99 /* 100 * Host to big endian, host to little endian, big endian to host, and little 101 * endian to host byte order functions as detailed in byteorder(9). 102 */ 103 #if _BYTE_ORDER == _LITTLE_ENDIAN 104 #define htobe16(x) __bswap16((x)) 105 #define htobe32(x) __bswap32((x)) 106 #define htobe64(x) __bswap64((x)) 107 #define htole16(x) ((uint16_t)(x)) 108 #define htole32(x) ((uint32_t)(x)) 109 #define htole64(x) ((uint64_t)(x)) 110 111 #define be16toh(x) __bswap16((x)) 112 #define be32toh(x) __bswap32((x)) 113 #define be64toh(x) __bswap64((x)) 114 #define le16toh(x) ((uint16_t)(x)) 115 #define le32toh(x) ((uint32_t)(x)) 116 #define le64toh(x) ((uint64_t)(x)) 117 #else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 118 #define htobe16(x) ((uint16_t)(x)) 119 #define htobe32(x) ((uint32_t)(x)) 120 #define htobe64(x) ((uint64_t)(x)) 121 #define htole16(x) __bswap16((x)) 122 #define htole32(x) __bswap32((x)) 123 #define htole64(x) __bswap64((x)) 124 125 #define be16toh(x) ((uint16_t)(x)) 126 #define be32toh(x) ((uint32_t)(x)) 127 #define be64toh(x) ((uint64_t)(x)) 128 #define le16toh(x) __bswap16((x)) 129 #define le32toh(x) __bswap32((x)) 130 #define le64toh(x) __bswap64((x)) 131 #endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 132 133 #endif /* _SYS__ENDIAN_H_ */ 134