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 * 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#define _BYTE_ORDER _BIG_ENDIAN 54 55/* 56 * Deprecated variants that don't have enough underscores to be useful in more 57 * strict namespaces. 58 */ 59#if __BSD_VISIBLE 60#define LITTLE_ENDIAN _LITTLE_ENDIAN 61#define BIG_ENDIAN _BIG_ENDIAN 62#define PDP_ENDIAN _PDP_ENDIAN 63#define BYTE_ORDER _BYTE_ORDER 64#endif 65 66#if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) && defined(__OPTIMIZE__) 67#define __is_constant(x) __builtin_constant_p(x) 68#else 69#define __is_constant(x) 0 70#endif 71 72#define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \ 73 (((__uint16_t)(x) << 8) & 0xff00)) 74#define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \ 75 (((__uint32_t)(x) >> 8) & 0xff00) | \ 76 (((__uint32_t)(x)<< 8) & 0xff0000) | \ 77 (((__uint32_t)(x) << 24) & 0xff000000)) 78#define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \ 79 (((__uint64_t)(x) >> 40) & 0xff00) | \ 80 (((__uint64_t)(x) >> 24) & 0xff0000) | \ 81 (((__uint64_t)(x) >> 8) & 0xff000000) | \ 82 (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \ 83 (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \ 84 (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \ 85 (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56))) 86 87static __inline __uint16_t 88__bswap16_var(__uint16_t _x) 89{ 90 91 return ((_x >> 8) | ((_x << 8) & 0xff00)); 92} 93 94static __inline __uint32_t 95__bswap32_var(__uint32_t _x) 96{ 97 98 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 99 ((_x << 24) & 0xff000000)); 100} 101 102static __inline __uint64_t 103__bswap64_var(__uint64_t _x) 104{ 105 106 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 107 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 108 ((_x << 24) & ((__uint64_t)0xff << 40)) | 109 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 110} 111 112#define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \ 113 __bswap16_var(x))) 114#define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \ 115 __bswap32_var(x)) 116#define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \ 117 __bswap64_var(x)) 118 119#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#endif /* !_MACHINE_ENDIAN_H_ */ 125