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 * $FreeBSD$ 31 */ 32 33 #ifndef _MACHINE_ENDIAN_H_ 34 #define _MACHINE_ENDIAN_H_ 35 36 #include <sys/cdefs.h> 37 #include <sys/_types.h> 38 39 /* 40 * Define the order of 32-bit words in 64-bit words. 41 */ 42 #define _QUAD_HIGHWORD 0 43 #define _QUAD_LOWWORD 1 44 45 /* 46 * GCC defines _BIG_ENDIAN and _LITTLE_ENDIAN equal to __BIG_ENDIAN__ 47 * and __LITTLE_ENDIAN__ (resp). 48 */ 49 #ifdef _BIG_ENDIAN 50 #undef _BIG_ENDIAN 51 #endif 52 #ifdef _LITTLE_ENDIAN 53 #undef _LITTLE_ENDIAN 54 #endif 55 56 /* 57 * Definitions for byte order, according to byte significance from low 58 * address to high. 59 */ 60 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 61 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 62 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 63 64 #ifdef __LITTLE_ENDIAN__ 65 #define _BYTE_ORDER _LITTLE_ENDIAN 66 #else 67 #define _BYTE_ORDER _BIG_ENDIAN 68 #endif 69 70 /* 71 * Deprecated variants that don't have enough underscores to be useful in more 72 * strict namespaces. 73 */ 74 #if __BSD_VISIBLE 75 #define LITTLE_ENDIAN _LITTLE_ENDIAN 76 #define BIG_ENDIAN _BIG_ENDIAN 77 #define PDP_ENDIAN _PDP_ENDIAN 78 #define BYTE_ORDER _BYTE_ORDER 79 #endif 80 81 #if defined(__GNUCLIKE_BUILTIN_CONSTANT_P) 82 #define __is_constant(x) __builtin_constant_p(x) 83 #else 84 #define __is_constant(x) 0 85 #endif 86 87 #define __bswap16_const(x) ((((__uint16_t)(x) >> 8) & 0xff) | \ 88 (((__uint16_t)(x) << 8) & 0xff00)) 89 #define __bswap32_const(x) ((((__uint32_t)(x) >> 24) & 0xff) | \ 90 (((__uint32_t)(x) >> 8) & 0xff00) | \ 91 (((__uint32_t)(x)<< 8) & 0xff0000) | \ 92 (((__uint32_t)(x) << 24) & 0xff000000)) 93 #define __bswap64_const(x) ((((__uint64_t)(x) >> 56) & 0xff) | \ 94 (((__uint64_t)(x) >> 40) & 0xff00) | \ 95 (((__uint64_t)(x) >> 24) & 0xff0000) | \ 96 (((__uint64_t)(x) >> 8) & 0xff000000) | \ 97 (((__uint64_t)(x) << 8) & ((__uint64_t)0xff << 32)) | \ 98 (((__uint64_t)(x) << 24) & ((__uint64_t)0xff << 40)) | \ 99 (((__uint64_t)(x) << 40) & ((__uint64_t)0xff << 48)) | \ 100 (((__uint64_t)(x) << 56) & ((__uint64_t)0xff << 56))) 101 102 static __inline __uint16_t 103 __bswap16_var(__uint16_t _x) 104 { 105 106 return ((_x >> 8) | ((_x << 8) & 0xff00)); 107 } 108 109 static __inline __uint32_t 110 __bswap32_var(__uint32_t _x) 111 { 112 113 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 114 ((_x << 24) & 0xff000000)); 115 } 116 117 static __inline __uint64_t 118 __bswap64_var(__uint64_t _x) 119 { 120 121 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 122 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 123 ((_x << 24) & ((__uint64_t)0xff << 40)) | 124 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 125 } 126 127 #define __bswap16(x) ((__uint16_t)(__is_constant(x) ? __bswap16_const(x) : \ 128 __bswap16_var(x))) 129 #define __bswap32(x) (__is_constant(x) ? __bswap32_const(x) : \ 130 __bswap32_var(x)) 131 #define __bswap64(x) (__is_constant(x) ? __bswap64_const(x) : \ 132 __bswap64_var(x)) 133 134 #define __htonl(x) ((__uint32_t)(x)) 135 #define __htons(x) ((__uint16_t)(x)) 136 #define __ntohl(x) ((__uint32_t)(x)) 137 #define __ntohs(x) ((__uint16_t)(x)) 138 139 #endif /* !_MACHINE_ENDIAN_H_ */ 140