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 Compatibility */ 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. PDP_ENDIAN isn't strictly in Issue 73 * 8, but is allowed as implementations can define any *_ENDIAN symbol. Since 74 * issue 8 doesn't yet have an assigned date, use strictly greater than issue 75 * 7's date. 76 */ 77#if __BSD_VISIBLE || _POSIX_C_SOURCE > 200809 78#define LITTLE_ENDIAN _LITTLE_ENDIAN 79#define BIG_ENDIAN _BIG_ENDIAN 80#define PDP_ENDIAN _PDP_ENDIAN 81#define BYTE_ORDER _BYTE_ORDER 82#endif 83 84/* bswap primitives, based on compiler builtins */ 85#define __bswap16(x) __builtin_bswap16(x) 86#define __bswap32(x) __builtin_bswap32(x) 87#define __bswap64(x) __builtin_bswap64(x) 88 89#if _BYTE_ORDER == _LITTLE_ENDIAN 90#define __ntohl(x) (__bswap32(x)) 91#define __ntohs(x) (__bswap16(x)) 92#define __htonl(x) (__bswap32(x)) 93#define __htons(x) (__bswap16(x)) 94#elif _BYTE_ORDER == _BIG_ENDIAN 95#define __htonl(x) ((__uint32_t)(x)) 96#define __htons(x) ((__uint16_t)(x)) 97#define __ntohl(x) ((__uint32_t)(x)) 98#define __ntohs(x) ((__uint16_t)(x)) 99#endif 100 101/* 102 * Host to big endian, host to little endian, big endian to host, and little 103 * endian to host byte order functions as detailed in byteorder(9). 104 */ 105#if _BYTE_ORDER == _LITTLE_ENDIAN 106#define htobe16(x) __bswap16((x)) 107#define htobe32(x) __bswap32((x)) 108#define htobe64(x) __bswap64((x)) 109#define htole16(x) ((uint16_t)(x)) 110#define htole32(x) ((uint32_t)(x)) 111#define htole64(x) ((uint64_t)(x)) 112 113#define be16toh(x) __bswap16((x)) 114#define be32toh(x) __bswap32((x)) 115#define be64toh(x) __bswap64((x)) 116#define le16toh(x) ((uint16_t)(x)) 117#define le32toh(x) ((uint32_t)(x)) 118#define le64toh(x) ((uint64_t)(x)) 119#else /* _BYTE_ORDER != _LITTLE_ENDIAN */ 120#define htobe16(x) ((uint16_t)(x)) 121#define htobe32(x) ((uint32_t)(x)) 122#define htobe64(x) ((uint64_t)(x)) 123#define htole16(x) __bswap16((x)) 124#define htole32(x) __bswap32((x)) 125#define htole64(x) __bswap64((x)) 126 127#define be16toh(x) ((uint16_t)(x)) 128#define be32toh(x) ((uint32_t)(x)) 129#define be64toh(x) ((uint64_t)(x)) 130#define le16toh(x) __bswap16((x)) 131#define le32toh(x) __bswap32((x)) 132#define le64toh(x) __bswap64((x)) 133#endif /* _BYTE_ORDER == _LITTLE_ENDIAN */ 134 135#endif /* _SYS__ENDIAN_H_ */ 136