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 * 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 7.8 (Berkeley) 4/3/91 34 * $FreeBSD$ 35 */ 36 37 #ifndef _MACHINE_ENDIAN_H_ 38 #define _MACHINE_ENDIAN_H_ 39 40 #include <sys/cdefs.h> 41 #include <machine/ansi.h> 42 43 /* 44 * Define the order of 32-bit words in 64-bit words. 45 */ 46 #define _QUAD_HIGHWORD 1 47 #define _QUAD_LOWWORD 0 48 49 /* 50 * Definitions for byte order, according to byte significance from low 51 * address to high. 52 */ 53 #ifndef _POSIX_SOURCE 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 #endif /* ! _POSIX_SOURCE */ 60 61 #ifdef __GNUC__ 62 63 __BEGIN_DECLS 64 65 static __inline __uint32_t 66 __htonl(__uint32_t __x) 67 { 68 #if defined(_KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU) 69 __asm ("bswap %0" : "+r" (__x)); 70 #else 71 __asm ("xchgb %h0, %b0\n\t" 72 "rorl $16, %0\n\t" 73 "xchgb %h0, %b0" 74 : "+q" (__x)); 75 #endif 76 return __x; 77 } 78 79 static __inline __uint16_t 80 __htons(__uint16_t __x) 81 { 82 __asm ("xchgb %h0, %b0" : "+q" (__x)); 83 84 return __x; 85 } 86 87 static __inline __uint32_t 88 __ntohl(__uint32_t __x) 89 { 90 91 return (__htonl(__x)); 92 } 93 94 static __inline __uint16_t 95 __ntohs(__uint16_t __x) 96 { 97 98 return (__htons(__x)); 99 } 100 101 __END_DECLS 102 103 #endif /* __GNUC__ */ 104 105 #endif /* !_MACHINE_ENDIAN_H_ */ 106