1 /* $NetBSD: endian.h,v 1.14 1994/10/27 04:16:03 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1991 Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)endian.h 7.8 (Berkeley) 4/3/91 36 */ 37 38 #ifndef _I386_ENDIAN_H_ 39 #define _I386_ENDIAN_H_ 40 41 /* 42 * Define the order of 32-bit words in 64-bit words. 43 */ 44 #define _QUAD_HIGHWORD 1 45 #define _QUAD_LOWWORD 0 46 47 48 #ifndef _POSIX_SOURCE 49 /* 50 * Definitions for byte order, according to byte significance from low 51 * address to high. 52 */ 53 #define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 54 #define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 55 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 56 57 #define BYTE_ORDER LITTLE_ENDIAN 58 59 #include <sys/cdefs.h> 60 61 __BEGIN_DECLS 62 unsigned long htonl __P((unsigned long)); 63 unsigned short htons __P((unsigned short)); 64 unsigned long ntohl __P((unsigned long)); 65 unsigned short ntohs __P((unsigned short)); 66 __END_DECLS 67 68 69 #ifdef __GNUC__ 70 71 #if defined(KERNEL) && !defined(I386_CPU) 72 #define __byte_swap_long(x) \ 73 ({ register unsigned long __x = (x); \ 74 __asm ("bswap %1" \ 75 : "=r" (__x) \ 76 : "0" (__x)); \ 77 __x; }) 78 #else 79 #define __byte_swap_long(x) \ 80 ({ register unsigned long __x = (x); \ 81 __asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \ 82 : "=r" (__x) \ 83 : "0" (__x)); \ 84 __x; }) 85 #endif /* KERNEL && ... */ 86 87 #define __byte_swap_word(x) \ 88 ({ register unsigned short __x = (x); \ 89 __asm ("rorw $8, %w1" \ 90 : "=r" (__x) \ 91 : "0" (__x)); \ 92 __x; }) 93 94 #define ntohl(x) __byte_swap_long(x) 95 #define ntohs(x) __byte_swap_word(x) 96 #define htonl(x) __byte_swap_long(x) 97 #define htons(x) __byte_swap_word(x) 98 99 #endif /* __GNUC__ */ 100 101 102 /* 103 * Macros for network/external number representation conversion. 104 */ 105 #define NTOHL(x) (x) = ntohl((unsigned long)(x)) 106 #define NTOHS(x) (x) = ntohs((unsigned short)(x)) 107 #define HTONL(x) (x) = htonl((unsigned long)(x)) 108 #define HTONS(x) (x) = htons((unsigned short)(x)) 109 110 #endif /* _POSIX_SOURCE */ 111 112 #endif /* !_I386_ENDIAN_H_ */ 113