1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001 David E. O'Brien 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)endian.h 8.1 (Berkeley) 6/10/93 31 * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $ 32 * $FreeBSD$ 33 */ 34 35 #ifndef _ENDIAN_H_ 36 #define _ENDIAN_H_ 37 38 #include <sys/_types.h> 39 40 /* 41 * Definitions for byte order, according to byte significance from low 42 * address to high. 43 */ 44 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 45 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 46 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 47 48 #ifdef __ARMEB__ 49 #define _BYTE_ORDER _BIG_ENDIAN 50 #else 51 #define _BYTE_ORDER _LITTLE_ENDIAN 52 #endif /* __ARMEB__ */ 53 54 #if __BSD_VISIBLE 55 #define LITTLE_ENDIAN _LITTLE_ENDIAN 56 #define BIG_ENDIAN _BIG_ENDIAN 57 #define PDP_ENDIAN _PDP_ENDIAN 58 #define BYTE_ORDER _BYTE_ORDER 59 #endif 60 61 #ifdef __ARMEB__ 62 #define _QUAD_HIGHWORD 0 63 #define _QUAD_LOWWORD 1 64 #define __ntohl(x) ((__uint32_t)(x)) 65 #define __ntohs(x) ((__uint16_t)(x)) 66 #define __htonl(x) ((__uint32_t)(x)) 67 #define __htons(x) ((__uint16_t)(x)) 68 #else 69 #define _QUAD_HIGHWORD 1 70 #define _QUAD_LOWWORD 0 71 #define __ntohl(x) (__bswap32(x)) 72 #define __ntohs(x) (__bswap16(x)) 73 #define __htonl(x) (__bswap32(x)) 74 #define __htons(x) (__bswap16(x)) 75 #endif /* __ARMEB__ */ 76 77 static __inline __uint64_t 78 __bswap64(__uint64_t _x) 79 { 80 81 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 82 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((__uint64_t)0xff << 32)) | 83 ((_x << 24) & ((__uint64_t)0xff << 40)) | 84 ((_x << 40) & ((__uint64_t)0xff << 48)) | ((_x << 56))); 85 } 86 87 static __inline __uint32_t 88 __bswap32_var(__uint32_t v) 89 { 90 __uint32_t t1; 91 92 __asm __volatile("eor %1, %0, %0, ror #16\n" 93 "bic %1, %1, #0x00ff0000\n" 94 "mov %0, %0, ror #8\n" 95 "eor %0, %0, %1, lsr #8\n" 96 : "+r" (v), "=r" (t1)); 97 98 return (v); 99 } 100 101 static __inline __uint16_t 102 __bswap16_var(__uint16_t v) 103 { 104 __uint32_t ret = v & 0xffff; 105 106 __asm __volatile( 107 "mov %0, %0, ror #8\n" 108 "orr %0, %0, %0, lsr #16\n" 109 "bic %0, %0, %0, lsl #16" 110 : "+r" (ret)); 111 112 return ((__uint16_t)ret); 113 } 114 115 #ifdef __OPTIMIZE__ 116 117 #define __bswap32_constant(x) \ 118 ((((x) & 0xff000000U) >> 24) | \ 119 (((x) & 0x00ff0000U) >> 8) | \ 120 (((x) & 0x0000ff00U) << 8) | \ 121 (((x) & 0x000000ffU) << 24)) 122 123 #define __bswap16_constant(x) \ 124 ((((x) & 0xff00) >> 8) | \ 125 (((x) & 0x00ff) << 8)) 126 127 #define __bswap16(x) \ 128 ((__uint16_t)(__builtin_constant_p(x) ? \ 129 __bswap16_constant(x) : \ 130 __bswap16_var(x))) 131 132 #define __bswap32(x) \ 133 ((__uint32_t)(__builtin_constant_p(x) ? \ 134 __bswap32_constant(x) : \ 135 __bswap32_var(x))) 136 137 #else 138 #define __bswap16(x) __bswap16_var(x) 139 #define __bswap32(x) __bswap32_var(x) 140 141 #endif /* __OPTIMIZE__ */ 142 #endif /* !_ENDIAN_H_ */ 143