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 * 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 * @(#)endian.h 8.1 (Berkeley) 6/10/93 34 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $ 35 * $FreeBSD$ 36 */ 37 38 #ifndef _MACHINE_ENDIAN_H_ 39 #define _MACHINE_ENDIAN_H_ 40 41 #include <sys/cdefs.h> 42 #include <sys/_types.h> 43 44 /* 45 * Define the order of 32-bit words in 64-bit words. 46 */ 47 #define _QUAD_HIGHWORD 0 48 #define _QUAD_LOWWORD 1 49 50 /* 51 * Definitions for byte order, according to byte significance from low 52 * address to high. 53 */ 54 #undef _BIG_ENDIAN /* GCC annoyingly defines this for PowerPC */ 55 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 56 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 57 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 58 59 #define _BYTE_ORDER _BIG_ENDIAN 60 61 /* 62 * Deprecated variants that don't have enough underscores to be useful in more 63 * strict namespaces. 64 */ 65 #if __BSD_VISIBLE 66 #define LITTLE_ENDIAN _LITTLE_ENDIAN 67 #define BIG_ENDIAN _BIG_ENDIAN 68 #define PDP_ENDIAN _PDP_ENDIAN 69 #define BYTE_ORDER _BYTE_ORDER 70 #endif 71 72 #ifdef __GNUC__ 73 74 static __inline __uint16_t 75 __bswap16(__uint16_t _x) 76 { 77 78 return ((_x >> 8) | ((_x << 8) & 0xff00)); 79 } 80 81 static __inline __uint32_t 82 __bswap32(__uint32_t _x) 83 { 84 85 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 86 ((_x << 24) & 0xff000000)); 87 } 88 89 static __inline __uint64_t 90 __bswap64(__uint64_t _x) 91 { 92 93 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 94 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 95 ((_x << 24) & ((__uint64_t)0xff << 40)) | 96 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 97 } 98 99 #define __htonl(x) ((__uint32_t)(x)) 100 #define __htons(x) ((__uint16_t)(x)) 101 #define __ntohl(x) ((__uint32_t)(x)) 102 #define __ntohs(x) ((__uint16_t)(x)) 103 104 #else /* !__GNUC__ */ 105 106 /* 107 * No optimizations are available for this compiler. Fall back to 108 * non-optimized functions by defining the constant usually used to prevent 109 * redefinition. 110 */ 111 #define _BYTEORDER_FUNC_DEFINED 112 113 #endif /* __GNUC__ */ 114 115 #endif /* !_MACHINE_ENDIAN_H_ */ 116