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 * from: @(#)endian.h 7.8 (Berkeley) 4/3/91 34 * $Id: endian.h,v 1.15 1997/04/20 11:44:32 bde Exp $ 35 */ 36 37 #ifndef _MACHINE_ENDIAN_H_ 38 #define _MACHINE_ENDIAN_H_ 39 40 /* 41 * Define the order of 32-bit words in 64-bit words. 42 */ 43 #define _QUAD_HIGHWORD 1 44 #define _QUAD_LOWWORD 0 45 46 #ifndef _POSIX_SOURCE 47 48 /* 49 * Definitions for byte order, according to byte significance from low 50 * address to high. 51 */ 52 #define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 53 #define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 54 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 55 56 #define BYTE_ORDER LITTLE_ENDIAN 57 58 #ifndef KERNEL 59 #include <sys/cdefs.h> 60 #endif 61 62 __BEGIN_DECLS 63 unsigned long htonl __P((unsigned long)); 64 unsigned short htons __P((unsigned short)); 65 unsigned long ntohl __P((unsigned long)); 66 unsigned short ntohs __P((unsigned short)); 67 __END_DECLS 68 69 #define __word_swap_long(x) \ 70 __extension__ ({ register u_long __X = (x); \ 71 __asm ("rorl $16, %1" \ 72 : "=r" (__X) \ 73 : "0" (__X)); \ 74 __X; }) 75 76 #if defined(KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU) 77 78 #define __byte_swap_long(x) \ 79 __extension__ ({ register u_long __X = (x); \ 80 __asm ("bswap %0" \ 81 : "=r" (__X) \ 82 : "0" (__X)); \ 83 __X; }) 84 #else 85 86 #define __byte_swap_long(x) \ 87 __extension__ ({ register u_long __X = (x); \ 88 __asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \ 89 : "=q" (__X) \ 90 : "0" (__X)); \ 91 __X; }) 92 #endif 93 94 #define __byte_swap_word(x) \ 95 __extension__ ({ register u_short __X = (x); \ 96 __asm ("xchgb %h1, %b1" \ 97 : "=q" (__X) \ 98 : "0" (__X)); \ 99 __X; }) 100 101 /* 102 * Macros for network/external number representation conversion. 103 */ 104 #ifdef __GNUC__ 105 #define ntohl __byte_swap_long 106 #define ntohs __byte_swap_word 107 #define htonl __byte_swap_long 108 #define htons __byte_swap_word 109 #endif 110 111 #define NTOHL(x) ((x) = ntohl((u_long)(x))) 112 #define NTOHS(x) ((x) = ntohs((u_short)(x))) 113 #define HTONL(x) ((x) = htonl((u_long)(x))) 114 #define HTONS(x) ((x) = htons((u_short)(x))) 115 116 #endif /* ! _POSIX_SOURCE */ 117 118 #endif /* !_MACHINE_ENDIAN_H_ */ 119