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 _ENDIAN_H_ 34 #define _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 #ifdef __ARMEB__ 47 #define _BYTE_ORDER _BIG_ENDIAN 48 #else 49 #define _BYTE_ORDER _LITTLE_ENDIAN 50 #endif /* __ARMEB__ */ 51 52 #if __BSD_VISIBLE 53 #define LITTLE_ENDIAN _LITTLE_ENDIAN 54 #define BIG_ENDIAN _BIG_ENDIAN 55 #define PDP_ENDIAN _PDP_ENDIAN 56 #define BYTE_ORDER _BYTE_ORDER 57 #endif 58 59 #ifdef __ARMEB__ 60 #define _QUAD_HIGHWORD 0 61 #define _QUAD_LOWWORD 1 62 #define __ntohl(x) ((__uint32_t)(x)) 63 #define __ntohs(x) ((__uint16_t)(x)) 64 #define __htonl(x) ((__uint32_t)(x)) 65 #define __htons(x) ((__uint16_t)(x)) 66 #else 67 #define _QUAD_HIGHWORD 1 68 #define _QUAD_LOWWORD 0 69 #define __ntohl(x) (__bswap32(x)) 70 #define __ntohs(x) (__bswap16(x)) 71 #define __htonl(x) (__bswap32(x)) 72 #define __htons(x) (__bswap16(x)) 73 #endif /* __ARMEB__ */ 74 75 static __inline __uint64_t 76 __bswap64(__uint64_t _x) 77 { 78 79 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 80 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 81 ((_x << 24) & ((__uint64_t)0xff << 40)) | 82 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 83 } 84 85 static __inline __uint32_t 86 __bswap32_var(__uint32_t v) 87 { 88 __uint32_t t1; 89 90 __asm __volatile("eor %1, %0, %0, ror #16\n" 91 "bic %1, %1, #0x00ff0000\n" 92 "mov %0, %0, ror #8\n" 93 "eor %0, %0, %1, lsr #8\n" 94 : "+r" (v), "=r" (t1)); 95 96 return (v); 97 } 98 99 static __inline __uint16_t 100 __bswap16_var(__uint16_t v) 101 { 102 __uint32_t ret = v & 0xffff; 103 104 __asm __volatile( 105 "mov %0, %0, ror #8\n" 106 "orr %0, %0, %0, lsr #16\n" 107 "bic %0, %0, %0, lsl #16" 108 : "+r" (ret)); 109 110 return ((__uint16_t)ret); 111 } 112 113 #ifdef __OPTIMIZE__ 114 115 #define __bswap32_constant(x) \ 116 ((((x) & 0xff000000U) >> 24) | \ 117 (((x) & 0x00ff0000U) >> 8) | \ 118 (((x) & 0x0000ff00U) << 8) | \ 119 (((x) & 0x000000ffU) << 24)) 120 121 #define __bswap16_constant(x) \ 122 ((((x) & 0xff00) >> 8) | \ 123 (((x) & 0x00ff) << 8)) 124 125 #define __bswap16(x) \ 126 ((__uint16_t)(__builtin_constant_p(x) ? \ 127 __bswap16_constant(x) : \ 128 __bswap16_var(x))) 129 130 #define __bswap32(x) \ 131 ((__uint32_t)(__builtin_constant_p(x) ? \ 132 __bswap32_constant(x) : \ 133 __bswap32_var(x))) 134 135 #else 136 #define __bswap16(x) __bswap16_var(x) 137 #define __bswap32(x) __bswap32_var(x) 138 139 #endif /* __OPTIMIZE__ */ 140 #endif /* !_ENDIAN_H_ */ 141