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 1.4 1993/12/19 05:14:45 alm Exp $ 35 */ 36 37 #ifndef _MACHINE_ENDIAN_H_ 38 #define _MACHINE_ENDIAN_H_ 1 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 * Definitions for byte order, according to byte significance from low 48 * address to high. 49 */ 50 #define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 51 #define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 52 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 53 54 #define BYTE_ORDER LITTLE_ENDIAN 55 56 #ifndef KERNEL 57 #include <sys/cdefs.h> 58 #endif 59 60 #define __word_swap_long(x) \ 61 ({ register u_long X = (x); \ 62 __asm ("rorl $16, %1" \ 63 : "=r" (X) \ 64 : "0" (X)); \ 65 X; }) 66 #if __GNUC__ >= 2 67 #define __byte_swap_long(x) \ 68 ({ register u_long X = (x); \ 69 __asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \ 70 : "=q" (X) \ 71 : "0" (X)); \ 72 X; }) 73 #define __byte_swap_word(x) \ 74 ({ register u_short X = (x); \ 75 __asm ("xchgb %h1, %b1" \ 76 : "=q" (X) \ 77 : "0" (X)); \ 78 X; }) 79 #else /* __GNUC__ >= 2 */ 80 #define __byte_swap_long(x) \ 81 ({ register u_long X = (x); \ 82 __asm ("rorw $8, %w1\n\trorl $16, %1\n\trorw $8, %w1" \ 83 : "=r" (X) \ 84 : "0" (X)); \ 85 X; }) 86 #define __byte_swap_word(x) \ 87 ({ register u_short X = (x); \ 88 __asm ("rorw $8, %w1" \ 89 : "=r" (X) \ 90 : "0" (X)); \ 91 X; }) 92 #endif /* __GNUC__ >= 2 */ 93 94 /* 95 * Macros for network/external number representation conversion. 96 */ 97 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint) 98 #define ntohl(x) (x) 99 #define ntohs(x) (x) 100 #define htonl(x) (x) 101 #define htons(x) (x) 102 103 #define NTOHL(x) (x) 104 #define NTOHS(x) (x) 105 #define HTONL(x) (x) 106 #define HTONS(x) (x) 107 108 #else 109 110 #define ntohl __byte_swap_long 111 #define ntohs __byte_swap_word 112 #define htonl __byte_swap_long 113 #define htons __byte_swap_word 114 115 #define NTOHL(x) (x) = ntohl((u_long)x) 116 #define NTOHS(x) (x) = ntohs((u_short)x) 117 #define HTONL(x) (x) = htonl((u_long)x) 118 #define HTONS(x) (x) = htons((u_short)x) 119 #endif 120 #endif /* _MACHINE_ENDIAN_H_ */ 121