1 /*- 2 * Copyright (c) 2001 David E. O'Brien 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. Neither the name of the University nor the names of its contributors 13 * may be used to endorse or promote products derived from this software 14 * without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * @(#)endian.h 8.1 (Berkeley) 6/10/93 29 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $ 30 * $FreeBSD$ 31 */ 32 33 #ifndef _MACHINE_ENDIAN_H_ 34 #define _MACHINE_ENDIAN_H_ 35 36 #include <sys/_types.h> 37 38 /* 39 * Definitions for byte order, according to byte significance from low 40 * address to high. 41 */ 42 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 43 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 44 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 45 46 #define _BYTE_ORDER _LITTLE_ENDIAN 47 48 #if __BSD_VISIBLE 49 #define LITTLE_ENDIAN _LITTLE_ENDIAN 50 #define BIG_ENDIAN _BIG_ENDIAN 51 #define PDP_ENDIAN _PDP_ENDIAN 52 #define BYTE_ORDER _BYTE_ORDER 53 #endif 54 55 #define _QUAD_HIGHWORD 1 56 #define _QUAD_LOWWORD 0 57 #define __ntohl(x) (__bswap32(x)) 58 #define __ntohs(x) (__bswap16(x)) 59 #define __htonl(x) (__bswap32(x)) 60 #define __htons(x) (__bswap16(x)) 61 62 static __inline __uint64_t 63 __bswap64(__uint64_t _x) 64 { 65 __uint64_t ret; 66 67 ret = (_x >> 56); 68 ret |= ((_x >> 40) & 0xff00); 69 ret |= ((_x >> 24) & 0xff0000); 70 ret |= ((_x >> 8) & 0xff000000); 71 ret |= ((_x << 8) & ((__uint64_t)0xff << 32)); 72 ret |= ((_x << 24) & ((__uint64_t)0xff << 40)); 73 ret |= ((_x << 40) & ((__uint64_t)0xff << 48)); 74 ret |= (_x << 56); 75 76 return (ret); 77 } 78 79 static __inline __uint32_t 80 __bswap32_var(__uint32_t _x) 81 { 82 83 return ((_x >> 24) | ((_x >> 8) & 0xff00) | ((_x << 8) & 0xff0000) | 84 ((_x << 24) & 0xff000000)); 85 } 86 87 static __inline __uint16_t 88 __bswap16_var(__uint16_t _x) 89 { 90 __uint32_t ret; 91 92 ret = ((_x >> 8) | ((_x << 8) & 0xff00)); 93 94 return ((__uint16_t)ret); 95 } 96 97 #ifdef __OPTIMIZE__ 98 99 #define __bswap32_constant(x) \ 100 ((((x) & 0xff000000U) >> 24) | \ 101 (((x) & 0x00ff0000U) >> 8) | \ 102 (((x) & 0x0000ff00U) << 8) | \ 103 (((x) & 0x000000ffU) << 24)) 104 105 #define __bswap16_constant(x) \ 106 ((((x) & 0xff00) >> 8) | \ 107 (((x) & 0x00ff) << 8)) 108 109 #define __bswap16(x) \ 110 ((__uint16_t)(__builtin_constant_p(x) ? \ 111 __bswap16_constant(x) : \ 112 __bswap16_var(x))) 113 114 #define __bswap32(x) \ 115 ((__uint32_t)(__builtin_constant_p(x) ? \ 116 __bswap32_constant(x) : \ 117 __bswap32_var(x))) 118 119 #else 120 #define __bswap16(x) __bswap16_var(x) 121 #define __bswap32(x) __bswap32_var(x) 122 123 #endif /* __OPTIMIZE__ */ 124 #endif /* !_MACHINE_ENDIAN_H_ */ 125