1/*- 2 * Copyright (c) 1987, 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)endian.h 7.8 (Berkeley) 4/3/91 30 * $FreeBSD$ 31 */ 32 33#ifndef _MACHINE_ENDIAN_H_ 34#define _MACHINE_ENDIAN_H_ 35 36#include <sys/cdefs.h> 37#ifndef __ASSEMBLER__ 38#include <sys/_types.h> 39#endif 40 41#ifdef __cplusplus 42extern "C" { 43#endif 44 45/* 46 * Definitions for byte order, according to byte significance from low 47 * address to high. 48 */ 49#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 50#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 51#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 52 53#ifdef __MIPSEB__ 54#define _BYTE_ORDER _BIG_ENDIAN 55#else 56#define _BYTE_ORDER _LITTLE_ENDIAN 57#endif /* __MIBSEB__ */ 58 59/* 60 * Deprecated variants that don't have enough underscores to be useful in more 61 * strict namespaces. 62 */ 63#if __BSD_VISIBLE 64#define LITTLE_ENDIAN _LITTLE_ENDIAN 65#define BIG_ENDIAN _BIG_ENDIAN 66#define PDP_ENDIAN _PDP_ENDIAN 67#define BYTE_ORDER _BYTE_ORDER 68#endif 69 70#ifndef __ASSEMBLER__ 71#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__) 72#define __is_constant(x) __builtin_constant_p(x) 73#else 74#define __is_constant(x) 0 75#endif 76 77#define __bswap16_const(x) (((x) >> 8) | (((x) << 8) & 0xff00)) 78#define __bswap32_const(x) (((x) >> 24) | (((x) >> 8) & 0xff00) | \ 79 (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000)) 80#define __bswap64_const(x) (((x) >> 56) | (((x) >> 40) & 0xff00) | \ 81 (((x) >> 24) & 0xff0000) | (((x) >> 8) & 0xff000000) | \ 82 (((x) << 8) & ((__uint64_t)0xff << 32)) | \ 83 (((x) << 24) & ((__uint64_t)0xff << 40)) | \ 84 (((x) << 40) & ((__uint64_t)0xff << 48)) | (((x) << 56))) 85 86static __inline __uint16_t 87__bswap16_var(__uint16_t _x) 88{ 89 90 return ((_x >> 8) | ((_x << 8) & 0xff00)); 91} 92 93static __inline __uint32_t 94__bswap32_var(__uint32_t _x) 95{ 96 97 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 98 ((_x << 24) & 0xff000000)); 99} 100 101static __inline __uint64_t 102__bswap64_var(__uint64_t _x) 103{ 104 105 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 106 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 107 ((_x << 24) & ((__uint64_t)0xff << 40)) | 108 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 109} 110 111#define __bswap16(x) ((__uint16_t)(__is_constant((x)) ? \ 112 __bswap16_const((__uint16_t)(x)) : __bswap16_var((__uint16_t)(x)))) 113#define __bswap32(x) ((__uint32_t)(__is_constant((x)) ? \ 114 __bswap32_const((__uint32_t)(x)) : __bswap32_var((__uint32_t)(x)))) 115#define __bswap64(x) ((__uint64_t)(__is_constant((x)) ? \ 116 __bswap64_const((__uint64_t)(x)) : __bswap64_var((__uint64_t)(x)))) 117 118#ifdef __MIPSEB__ 119#define __htonl(x) ((__uint32_t)(x)) 120#define __htons(x) ((__uint16_t)(x)) 121#define __ntohl(x) ((__uint32_t)(x)) 122#define __ntohs(x) ((__uint16_t)(x)) 123/* 124 * Define the order of 32-bit words in 64-bit words. 125 */ 126/* 127 * XXXMIPS: Additional parentheses to make gcc more happy. 128 */ 129#define _QUAD_HIGHWORD 0 130#define _QUAD_LOWWORD 1 131#else 132#define _QUAD_HIGHWORD 1 133#define _QUAD_LOWWORD 0 134#define __ntohl(x) (__bswap32((x))) 135#define __ntohs(x) (__bswap16((x))) 136#define __htonl(x) (__bswap32((x))) 137#define __htons(x) (__bswap16((x))) 138#endif /* _MIPSEB */ 139 140#endif /* _ASSEMBLER_ */ 141 142#ifdef __cplusplus 143} 144#endif 145 146#endif /* !_MACHINE_ENDIAN_H_ */ 147