1/*- 2 * Copyright (c) 1987, 1991, 1993 3 * The Regents of the University of California. 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 8.1 (Berkeley) 6/10/93 30 * $FreeBSD$ 31 */ 32 33#ifndef _MACHINE_ENDIAN_H_ 34#define _MACHINE_ENDIAN_H_ 35 36#include <sys/cdefs.h> 37#include <sys/_types.h> 38 39/* 40 * Define the order of 32-bit words in 64-bit words. 41 */ 42#define _QUAD_HIGHWORD 0 43#define _QUAD_LOWWORD 1 44 45/* 46 * GCC defines _BIG_ENDIAN and _LITTLE_ENDIAN equal to __BIG_ENDIAN__ 47 * and __LITTLE_ENDIAN__ (resp). 48 */ 49#ifdef _BIG_ENDIAN 50#undef _BIG_ENDIAN 51#endif 52#ifdef _LITTLE_ENDIAN 53#undef _LITTLE_ENDIAN 54#endif 55 56/* 57 * Definitions for byte order, according to byte significance from low 58 * address to high. 59 */ 60#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 61#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 62#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 63 64#ifdef __LITTLE_ENDIAN__ 65#define _BYTE_ORDER _LITTLE_ENDIAN 66#else 67#define _BYTE_ORDER _BIG_ENDIAN 68#endif 69 70/* 71 * Deprecated variants that don't have enough underscores to be useful in more 72 * strict namespaces. 73 */ 74#if __BSD_VISIBLE 75#define LITTLE_ENDIAN _LITTLE_ENDIAN 76#define BIG_ENDIAN _BIG_ENDIAN 77#define PDP_ENDIAN _PDP_ENDIAN 78#define BYTE_ORDER _BYTE_ORDER 79#endif 80 81#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) 82#define __is_constant(x) __builtin_constant_p(x) 83#else 84#define __is_constant(x) 0 85#endif 86 87#define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \ 88 (((__uint16_t)(x) << 8) & 0xff00)) 89#define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \ 90 (((__uint32_t)(x) >> 8) & 0xff00) | \ 91 (((__uint32_t)(x)<< 8) & 0xff0000) | \ 92 (((__uint32_t)(x) << 24) & 0xff000000)) 93#define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \ 94 (((__uint64_t)(x) >> 40) & 0xff00) | \ 95 (((__uint64_t)(x) >> 24) & 0xff0000) | \ 96 (((__uint64_t)(x) >> 8) & 0xff000000) | \ 97 (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \ 98 (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \ 99 (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \ 100 (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56))) 101 102static __inline __uint16_t 103__bswap16_var(__uint16_t _x) 104{ 105 106 return ((_x >> 8) | ((_x << 8) & 0xff00)); 107} 108 109static __inline __uint32_t 110__bswap32_var(__uint32_t _x) 111{ 112 113 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 114 ((_x << 24) & 0xff000000)); 115} 116 117static __inline __uint64_t 118__bswap64_var(__uint64_t _x) 119{ 120 121 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 122 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 123 ((_x << 24) & ((__uint64_t)0xff << 40)) | 124 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 125} 126 127#define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \ 128 __bswap16_var(x))) 129#define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \ 130 __bswap32_var(x)) 131#define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \ 132 __bswap64_var(x)) 133 134#define __htonl(x) ((__uint32_t)(x)) 135#define __htons(x) ((__uint16_t)(x)) 136#define __ntohl(x) ((__uint32_t)(x)) 137#define __ntohs(x) ((__uint16_t)(x)) 138 139#endif /* !_MACHINE_ENDIAN_H_ */ 140