1 /* $NetBSD: endian.h,v 1.9 1997/10/09 15:42:29 bouyer 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 u_int16_t bswap16 __P((u_int16_t)); 67 u_int32_t bswap32 __P((u_int32_t)); 68 u_int64_t bswap64 __P((u_int64_t)); 69 __END_DECLS 70 71 #ifdef __GNUC__ 72 73 #define __byte_swap_long_variable(x) \ 74 ({ register u_int32_t __y, __x = (x); \ 75 \ 76 __asm ("rotl $-8, %1, %0; \ 77 insv %0, $16, $8, %0; \ 78 rotl $8, %1, r1; \ 79 movb r1, %0" \ 80 : "&=r" (__y) \ 81 : "r" (__x) \ 82 : "r1", "cc" ); \ 83 __y; }) 84 85 #define __byte_swap_word_variable(x) \ 86 ({ register u_int16_t __y, __x = (x); \ 87 \ 88 __asm ("rotl $8, %1, %0; \ 89 rotl $-8, %1, r1; \ 90 movb r1, %0; \ 91 movzwl %0, %0" \ 92 : "&=r" (__y) \ 93 : "r" (__x) \ 94 : "r1", "cc" ); \ 95 __y; }) 96 97 98 #define __byte_swap_long(x) __byte_swap_long_variable(x) 99 #define __byte_swap_word(x) __byte_swap_word_variable(x) 100 101 #define ntohl(x) __byte_swap_long(x) 102 #define ntohs(x) __byte_swap_word(x) 103 #define htonl(x) __byte_swap_long(x) 104 #define htons(x) __byte_swap_word(x) 105 106 #endif /* __GNUC__ */ 107 108 /* 109 * Macros for network/external number representation conversion. 110 */ 111 #define NTOHL(x) (x) = ntohl((in_addr_t)(x)) 112 #define NTOHS(x) (x) = ntohs((in_port_t)(x)) 113 #define HTONL(x) (x) = htonl((in_addr_t)(x)) 114 #define HTONS(x) (x) = htons((in_port_t)(x)) 115 116 #endif /* _POSIX_SOURCE */ 117 118 #endif /* _VAX_ENDIAN_H_ */ 119