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 1.13 1997/02/22 09:34:31 peter 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 * 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 #else 59 #ifndef ACTUALLY_LKM_NOT_KERNEL 60 #include "opt_cpu.h" 61 #endif 62 #endif 63 64 #define __word_swap_long(x) \ 65 __extension__ ({ register u_long __X = (x); \ 66 __asm ("rorl $16, %1" \ 67 : "=r" (__X) \ 68 : "0" (__X)); \ 69 __X; }) 70 71 #if defined(KERNEL) && (defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU)) && !defined(I386_CPU) 72 73 #define __byte_swap_long(x) \ 74 __extension__ ({ register u_long __X = (x); \ 75 __asm ("bswap %0" \ 76 : "=r" (__X) \ 77 : "0" (__X)); \ 78 __X; }) 79 #else 80 81 #define __byte_swap_long(x) \ 82 __extension__ ({ register u_long __X = (x); \ 83 __asm ("xchgb %h1, %b1\n\trorl $16, %1\n\txchgb %h1, %b1" \ 84 : "=q" (__X) \ 85 : "0" (__X)); \ 86 __X; }) 87 #endif 88 89 #define __byte_swap_word(x) \ 90 __extension__ ({ register u_short __X = (x); \ 91 __asm ("xchgb %h1, %b1" \ 92 : "=q" (__X) \ 93 : "0" (__X)); \ 94 __X; }) 95 96 /* 97 * Macros for network/external number representation conversion. 98 */ 99 #if BYTE_ORDER == BIG_ENDIAN || defined(lint) 100 #define ntohl(x) (x) 101 #define ntohs(x) (x) 102 #define htonl(x) (x) 103 #define htons(x) (x) 104 105 #define NTOHL(x) (x) 106 #define NTOHS(x) (x) 107 #define HTONL(x) (x) 108 #define HTONS(x) (x) 109 110 #else 111 112 #ifdef __GNUC__ 113 #define ntohl __byte_swap_long 114 #define ntohs __byte_swap_word 115 #define htonl __byte_swap_long 116 #define htons __byte_swap_word 117 #endif 118 119 #define NTOHL(x) ((x) = ntohl((u_long)(x))) 120 #define NTOHS(x) ((x) = ntohs((u_short)(x))) 121 #define HTONL(x) ((x) = htonl((u_long)(x))) 122 #define HTONS(x) ((x) = htons((u_short)(x))) 123 #endif 124 125 #endif /* !_MACHINE_ENDIAN_H_ */ 126