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 __asm __volatile("rev %0, %1\n" 68 : "=&r" (ret), "+r" (x)); 69 70 return (ret); 71 } 72 73 static __inline __uint32_t 74 __bswap32_var(__uint32_t v) 75 { 76 __uint32_t ret; 77 78 __asm __volatile("rev32 %x0, %x1\n" 79 : "=&r" (ret), "+r" (v)); 80 81 return (ret); 82 } 83 84 static __inline __uint16_t 85 __bswap16_var(__uint16_t v) 86 { 87 __uint32_t ret; 88 89 __asm __volatile("rev16 %w0, %w1\n" 90 : "=&r" (ret), "+r" (v)); 91 92 return ((__uint16_t)ret); 93 } 94 95 #ifdef __OPTIMIZE__ 96 97 #define __bswap32_constant(x) \ 98 ((((x) & 0xff000000U) >> 24) | \ 99 (((x) & 0x00ff0000U) >> 8) | \ 100 (((x) & 0x0000ff00U) << 8) | \ 101 (((x) & 0x000000ffU) << 24)) 102 103 #define __bswap16_constant(x) \ 104 ((((x) & 0xff00) >> 8) | \ 105 (((x) & 0x00ff) << 8)) 106 107 #define __bswap16(x) \ 108 ((__uint16_t)(__builtin_constant_p(x) ? \ 109 __bswap16_constant(x) : \ 110 __bswap16_var(x))) 111 112 #define __bswap32(x) \ 113 ((__uint32_t)(__builtin_constant_p(x) ? \ 114 __bswap32_constant(x) : \ 115 __bswap32_var(x))) 116 117 #else 118 #define __bswap16(x) __bswap16_var(x) 119 #define __bswap32(x) __bswap32_var(x) 120 121 #endif /* __OPTIMIZE__ */ 122 #endif /* !_MACHINE_ENDIAN_H_ */ 123