1 /*- 2 * Copyright (c) 1987, 1991, 1993 3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)endian.h 8.1 (Berkeley) 6/10/93 30 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $ 31 * $FreeBSD$ 32 */ 33 34 #ifndef _MACHINE_ENDIAN_H_ 35 #define _MACHINE_ENDIAN_H_ 36 37 #include <sys/cdefs.h> 38 #include <sys/_types.h> 39 40 /* 41 * Define the order of 32-bit words in 64-bit words. 42 */ 43 #define _QUAD_HIGHWORD 0 44 #define _QUAD_LOWWORD 1 45 46 /* 47 * GCC defines _BIG_ENDIAN and _LITTLE_ENDIAN equal to __BIG_ENDIAN__ 48 * and __LITTLE_ENDIAN__ (resp). 49 */ 50 #ifdef _BIG_ENDIAN 51 #undef _BIG_ENDIAN 52 #endif 53 #ifdef _LITTLE_ENDIAN 54 #undef _LITTLE_ENDIAN 55 #endif 56 57 /* 58 * Definitions for byte order, according to byte significance from low 59 * address to high. 60 */ 61 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 62 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 63 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 64 65 #ifdef __LITTLE_ENDIAN__ 66 #define _BYTE_ORDER _LITTLE_ENDIAN 67 #else 68 #define _BYTE_ORDER _BIG_ENDIAN 69 #endif 70 71 /* 72 * Deprecated variants that don't have enough underscores to be useful in more 73 * strict namespaces. 74 */ 75 #if __BSD_VISIBLE 76 #define LITTLE_ENDIAN _LITTLE_ENDIAN 77 #define BIG_ENDIAN _BIG_ENDIAN 78 #define PDP_ENDIAN _PDP_ENDIAN 79 #define BYTE_ORDER _BYTE_ORDER 80 #endif 81 82 #ifdef __CC_SUPPORTS___INLINE 83 84 static __inline __uint16_t 85 __bswap16(__uint16_t _x) 86 { 87 88 return ((_x >> 8) | ((_x << 8) & 0xff00)); 89 } 90 91 static __inline __uint32_t 92 __bswap32(__uint32_t _x) 93 { 94 95 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 96 ((_x << 24) & 0xff000000)); 97 } 98 99 static __inline __uint64_t 100 __bswap64(__uint64_t _x) 101 { 102 103 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 104 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 105 ((_x << 24) & ((__uint64_t)0xff << 40)) | 106 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 107 } 108 109 #define __htonl(x) ((__uint32_t)(x)) 110 #define __htons(x) ((__uint16_t)(x)) 111 #define __ntohl(x) ((__uint32_t)(x)) 112 #define __ntohs(x) ((__uint16_t)(x)) 113 114 #else /* !__CC_SUPPORTS___INLINE */ 115 116 /* 117 * No optimizations are available for this compiler. Fall back to 118 * non-optimized functions by defining the constant usually used to prevent 119 * redefinition. 120 */ 121 #define _BYTEORDER_FUNC_DEFINED 122 123 #endif /* __CC_SUPPORTS___INLINE */ 124 125 #endif /* !_MACHINE_ENDIAN_H_ */ 126