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 * @(#)endian.h 7.8 (Berkeley) 4/3/91 32 * $FreeBSD$ 33 */ 34 35#ifndef _MACHINE_ENDIAN_H_ 36#define _MACHINE_ENDIAN_H_ 37 38#include <sys/cdefs.h> 39#ifndef __ASSEMBLER__ 40#include <sys/_types.h> 41#endif 42 43#ifdef __cplusplus 44extern "C" { 45#endif 46 47/* 48 * Definitions for byte order, according to byte significance from low 49 * address to high. 50 */ 51#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 52#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 53#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 54 55#ifdef __MIPSEB__ 56#define _BYTE_ORDER _BIG_ENDIAN 57#else 58#define _BYTE_ORDER _LITTLE_ENDIAN 59#endif /* __MIBSEB__ */ 60 61/* 62 * Deprecated variants that don't have enough underscores to be useful in more 63 * strict namespaces. 64 */ 65#if __BSD_VISIBLE 66#define LITTLE_ENDIAN _LITTLE_ENDIAN 67#define BIG_ENDIAN _BIG_ENDIAN 68#define PDP_ENDIAN _PDP_ENDIAN 69#define BYTE_ORDER _BYTE_ORDER 70#endif 71 72#ifndef __ASSEMBLER__ 73#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__) 74#define __is_constant(x) __builtin_constant_p(x) 75#else 76#define __is_constant(x) 0 77#endif 78 79#define __bswap16_const(x) (((x) >> 8) | (((x) << 8) & 0xff00)) 80#define __bswap32_const(x) (((x) >> 24) | (((x) >> 8) & 0xff00) | \ 81 (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000)) 82#define __bswap64_const(x) (((x) >> 56) | (((x) >> 40) & 0xff00) | \ 83 (((x) >> 24) & 0xff0000) | (((x) >> 8) & 0xff000000) | \ 84 (((x) << 8) & ((__uint64_t)0xff << 32)) | \ 85 (((x) << 24) & ((__uint64_t)0xff << 40)) | \ 86 (((x) << 40) & ((__uint64_t)0xff << 48)) | (((x) << 56))) 87 88static __inline __uint16_t 89__bswap16_var(__uint16_t _x) 90{ 91 92 return ((_x >> 8) | ((_x << 8) & 0xff00)); 93} 94 95static __inline __uint32_t 96__bswap32_var(__uint32_t _x) 97{ 98 99 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 100 ((_x << 24) & 0xff000000)); 101} 102 103static __inline __uint64_t 104__bswap64_var(__uint64_t _x) 105{ 106 107 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 108 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 109 ((_x << 24) & ((__uint64_t)0xff << 40)) | 110 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 111} 112 113#define __bswap16(x) ((__uint16_t)(__is_constant((x)) ? \ 114 __bswap16_const((__uint16_t)(x)) : __bswap16_var((__uint16_t)(x)))) 115#define __bswap32(x) ((__uint32_t)(__is_constant((x)) ? \ 116 __bswap32_const((__uint32_t)(x)) : __bswap32_var((__uint32_t)(x)))) 117#define __bswap64(x) ((__uint64_t)(__is_constant((x)) ? \ 118 __bswap64_const((__uint64_t)(x)) : __bswap64_var((__uint64_t)(x)))) 119 120#ifdef __MIPSEB__ 121#define __htonl(x) ((__uint32_t)(x)) 122#define __htons(x) ((__uint16_t)(x)) 123#define __ntohl(x) ((__uint32_t)(x)) 124#define __ntohs(x) ((__uint16_t)(x)) 125/* 126 * Define the order of 32-bit words in 64-bit words. 127 */ 128/* 129 * XXXMIPS: Additional parentheses to make gcc more happy. 130 */ 131#define _QUAD_HIGHWORD 0 132#define _QUAD_LOWWORD 1 133#else 134#define _QUAD_HIGHWORD 1 135#define _QUAD_LOWWORD 0 136#define __ntohl(x) (__bswap32((x))) 137#define __ntohs(x) (__bswap16((x))) 138#define __htonl(x) (__bswap32((x))) 139#define __htons(x) (__bswap16((x))) 140#endif /* _MIPSEB */ 141 142#endif /* _ASSEMBLER_ */ 143 144#ifdef __cplusplus 145} 146#endif 147 148#endif /* !_MACHINE_ENDIAN_H_ */ 149