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 1.3 1993/05/22 08:00:16 cgd Exp $ 35 */ 36 37 /* 38 * Definitions for byte order, according to byte significance from low 39 * address to high. 40 */ 41 #define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 42 #define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 43 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 44 45 #define BYTE_ORDER LITTLE_ENDIAN 46 47 #ifndef KERNEL 48 #include <sys/cdefs.h> 49 #endif 50 51 #define __word_swap_long(x) \ 52 ({ register u_long X = (x); \ 53 asm ("rorl $16, %1" \ 54 : "=r" (X) \ 55 : "0" (X)); \ 56 X; }) 57 #if __GNUC__ >= 2 58 #define __byte_swap_long(x) \ 59 ({ register u_long X = (x); \ 60 asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \ 61 : "=q" (X) \ 62 : "0" (X)); \ 63 X; }) 64 #define __byte_swap_word(x) \ 65 ({ register u_short X = (x); \ 66 asm ("xchgb %h1, %b1" \ 67 : "=q" (X) \ 68 : "0" (X)); \ 69 X; }) 70 #else /* __GNUC__ >= 2 */ 71 #define __byte_swap_long(x) \ 72 ({ register u_long X = (x); \ 73 asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \ 74 : "=r" (X) \ 75 : "0" (X)); \ 76 X; }) 77 #define __byte_swap_word(x) \ 78 ({ register u_short X = (x); \ 79 asm ("rorw $8, %w1" \ 80 : "=r" (X) \ 81 : "0" (X)); \ 82 X; }) 83 #endif /* __GNUC__ >= 2 */ 84 85 /* 86 * Macros for network/external number representation conversion. 87 */ 88 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint) 89 #define ntohl(x) (x) 90 #define ntohs(x) (x) 91 #define htonl(x) (x) 92 #define htons(x) (x) 93 94 #define NTOHL(x) (x) 95 #define NTOHS(x) (x) 96 #define HTONL(x) (x) 97 #define HTONS(x) (x) 98 99 #else 100 101 #define ntohl __byte_swap_long 102 #define ntohs __byte_swap_word 103 #define htonl __byte_swap_long 104 #define htons __byte_swap_word 105 106 #define NTOHL(x) (x) = ntohl((u_long)x) 107 #define NTOHS(x) (x) = ntohs((u_short)x) 108 #define HTONL(x) (x) = htonl((u_long)x) 109 #define HTONS(x) (x) = htons((u_short)x) 110 #endif 111