endian.h revision 118382
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)endian.h 8.1 (Berkeley) 6/10/93 34 * $NetBSD: endian.h,v 1.5 1997/10/09 15:42:19 bouyer Exp $ 35 * $FreeBSD: head/sys/ia64/include/endian.h 118382 2003-08-03 07:50:19Z obrien $ 36 */ 37 38#ifndef _MACHINE_ENDIAN_H_ 39#define _MACHINE_ENDIAN_H_ 40 41#include <sys/cdefs.h> 42#include <sys/_types.h> 43 44/* 45 * Define the order of 32-bit words in 64-bit words. 46 */ 47#define _QUAD_HIGHWORD 1 48#define _QUAD_LOWWORD 0 49 50/* 51 * Definitions for byte order, according to byte significance from low 52 * address to high. 53 */ 54#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 55#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 56#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 57 58#define _BYTE_ORDER _LITTLE_ENDIAN 59 60/* 61 * Deprecated variants that don't have enough underscores to be useful in more 62 * strict namespaces. 63 */ 64#if __BSD_VISIBLE 65#define LITTLE_ENDIAN _LITTLE_ENDIAN 66#define BIG_ENDIAN _BIG_ENDIAN 67#define PDP_ENDIAN _PDP_ENDIAN 68#define BYTE_ORDER _BYTE_ORDER 69#endif 70 71#ifdef __GNUC__ 72 73static __inline __uint64_t 74__bswap64(__uint64_t _x) 75{ 76 __uint64_t __r; 77 78 __asm __volatile("mux1 %0=%1,@rev" 79 : "=r" (__r) : "r"(_x)); 80 return __r; 81} 82 83static __inline __uint32_t 84__bswap32(__uint32_t _x) 85{ 86 87 return (__bswap64(_x) >> 32); 88} 89 90static __inline __uint16_t 91__bswap16(__uint16_t _x) 92{ 93 94 return (__bswap64(_x) >> 48); 95} 96 97#define __htonl(x) __bswap32(x) 98#define __htons(x) __bswap16(x) 99#define __ntohl(x) __bswap32(x) 100#define __ntohs(x) __bswap16(x) 101 102#else /* !__GNUC__ */ 103 104/* 105 * No optimizations are available for this compiler. Fall back to 106 * non-optimized functions by defining the constant usually used to prevent 107 * redefinition. 108 */ 109#define _BYTEORDER_FUNC_DEFINED 110 111#endif /* __GNUC__ */ 112 113#endif /* !_MACHINE_ENDIAN_H_ */ 114