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 1.10 1994/03/16 17:20:24 jtc 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 47 #ifndef _POSIX_SOURCE 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 #include <sys/cdefs.h> 59 60 __BEGIN_DECLS 61 unsigned long htonl __P((unsigned long)); 62 unsigned short htons __P((unsigned short)); 63 unsigned long ntohl __P((unsigned long)); 64 unsigned short ntohs __P((unsigned short)); 65 __END_DECLS 66 67 68 #ifdef __GNUC__ 69 70 #if __GNUC__ >= 2 71 72 #if defined(KERNEL) && !defined(I386_CPU) 73 #define __byte_swap_long(x) \ 74 ({ register unsigned long __x = (x); \ 75 asm ("bswap %1" \ 76 : "=q" (__x) \ 77 : "0" (__x)); \ 78 __x; }) 79 #else 80 #define __byte_swap_long(x) \ 81 ({ register unsigned long __x = (x); \ 82 asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \ 83 : "=q" (__x) \ 84 : "0" (__x)); \ 85 __x; }) 86 #endif /* KERNEL && ... */ 87 #define __byte_swap_word(x) \ 88 ({ register unsigned short __x = (x); \ 89 asm ("rorw $8, %w1" \ 90 : "=q" (__x) \ 91 : "0" (__x)); \ 92 __x; }) 93 94 #else /* __GNUC__ >= 2 */ 95 96 #if defined(KERNEL) && !defined(I386_CPU) 97 #define __byte_swap_long(x) \ 98 ({ register unsigned long __x = (x); \ 99 asm ("bswap %1" \ 100 : "=r" (__x) \ 101 : "0" (__x)); \ 102 __x; }) 103 #else 104 #define __byte_swap_long(x) \ 105 ({ register u_long __x = (x); \ 106 asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \ 107 : "=r" (__x) \ 108 : "0" (__x)); \ 109 __x; }) 110 #endif /* KERNEL && ... */ 111 #define __byte_swap_word(x) \ 112 ({ register u_short __x = (x); \ 113 asm ("rorw $8, %w1" \ 114 : "=r" (__x) \ 115 : "0" (__x)); \ 116 __x; }) 117 118 #endif /* __GNUC__ >= 2 */ 119 120 #define ntohl(x) __byte_swap_long(x) 121 #define ntohs(x) __byte_swap_word(x) 122 #define htonl(x) __byte_swap_long(x) 123 #define htons(x) __byte_swap_word(x) 124 125 #endif /* __GNUC__ */ 126 127 128 /* 129 * Macros for network/external number representation conversion. 130 */ 131 #define NTOHL(x) (x) = ntohl((u_long)x) 132 #define NTOHS(x) (x) = ntohs((u_short)x) 133 #define HTONL(x) (x) = htonl((u_long)x) 134 #define HTONS(x) (x) = htons((u_short)x) 135 136 #endif /* _POSIX_SOURCE */ 137 138 #endif /* _MACHINE_ENDIAN_H_ */ 139