1 /* $NetBSD: endian.h,v 1.8 1996/10/13 03:28:00 christos 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 _VAX_ENDIAN_H_ 39 #define _VAX_ENDIAN_H_ 40 41 #define _QUAD_HIGHWORD 1 42 #define _QUAD_LOWWORD 0 43 44 #ifndef _POSIX_SOURCE 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 #include <sys/cdefs.h> 57 58 typedef u_int32_t in_addr_t; 59 typedef u_int16_t in_port_t; 60 61 __BEGIN_DECLS 62 in_addr_t htonl __P((in_addr_t)); 63 in_port_t htons __P((in_port_t)); 64 in_addr_t ntohl __P((in_addr_t)); 65 in_port_t ntohs __P((in_port_t)); 66 __END_DECLS 67 68 #ifdef __GNUC__ 69 70 #define __byte_swap_long_variable(x) \ 71 ({ register u_int32_t __y, __x = (x); \ 72 \ 73 __asm ("rotl $-8, %1, %0; \ 74 insv %0, $16, $8, %0; \ 75 rotl $8, %1, r1; \ 76 movb r1, %0" \ 77 : "&=r" (__y) \ 78 : "r" (__x) \ 79 : "r1", "cc" ); \ 80 __y; }) 81 82 #define __byte_swap_word_variable(x) \ 83 ({ register u_int16_t __y, __x = (x); \ 84 \ 85 __asm ("rotl $8, %1, %0; \ 86 rotl $-8, %1, r1; \ 87 movb r1, %0; \ 88 movzwl %0, %0" \ 89 : "&=r" (__y) \ 90 : "r" (__x) \ 91 : "r1", "cc" ); \ 92 __y; }) 93 94 95 #define __byte_swap_long(x) __byte_swap_long_variable(x) 96 #define __byte_swap_word(x) __byte_swap_word_variable(x) 97 98 #define ntohl(x) __byte_swap_long(x) 99 #define ntohs(x) __byte_swap_word(x) 100 #define htonl(x) __byte_swap_long(x) 101 #define htons(x) __byte_swap_word(x) 102 103 #endif /* __GNUC__ */ 104 105 /* 106 * Macros for network/external number representation conversion. 107 */ 108 #define NTOHL(x) (x) = ntohl((in_addr_t)(x)) 109 #define NTOHS(x) (x) = ntohs((in_port_t)(x)) 110 #define HTONL(x) (x) = htonl((in_addr_t)(x)) 111 #define HTONS(x) (x) = htons((in_port_t)(x)) 112 113 #endif /* _POSIX_SOURCE */ 114 115 #endif /* _VAX_ENDIAN_H_ */ 116