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 * Portions copyright (c) 2018, ARM Limited and Contributors. 36 * All rights reserved. 37 */ 38 39 #ifndef ENDIAN__H 40 #define ENDIAN__H 41 42 #include <stdint.h> 43 44 /* 45 * Definitions for byte order, according to byte significance from low 46 * address to high. 47 */ 48 #define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ 49 #define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ 50 #define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ 51 52 #ifdef __ARMEB__ 53 #define _BYTE_ORDER _BIG_ENDIAN 54 #else 55 #define _BYTE_ORDER _LITTLE_ENDIAN 56 #endif /* __ARMEB__ */ 57 58 #if __BSD_VISIBLE 59 #define LITTLE_ENDIAN _LITTLE_ENDIAN 60 #define BIG_ENDIAN _BIG_ENDIAN 61 #define PDP_ENDIAN _PDP_ENDIAN 62 #define BYTE_ORDER _BYTE_ORDER 63 #endif 64 65 #ifdef __ARMEB__ 66 #define _QUAD_HIGHWORD 0 67 #define _QUAD_LOWWORD 1 68 #define __ntohl(x) ((uint32_t)(x)) 69 #define __ntohs(x) ((uint16_t)(x)) 70 #define __htonl(x) ((uint32_t)(x)) 71 #define __htons(x) ((uint16_t)(x)) 72 #else 73 #define _QUAD_HIGHWORD 1 74 #define _QUAD_LOWWORD 0 75 #define __ntohl(x) (__bswap32(x)) 76 #define __ntohs(x) (__bswap16(x)) 77 #define __htonl(x) (__bswap32(x)) 78 #define __htons(x) (__bswap16(x)) 79 #endif /* __ARMEB__ */ 80 81 static __inline uint64_t 82 __bswap64(uint64_t _x) 83 { 84 85 return ((_x >> 56) | ((_x >> 40) & 0xff00) | ((_x >> 24) & 0xff0000) | 86 ((_x >> 8) & 0xff000000) | ((_x << 8) & ((uint64_t)0xff << 32)) | 87 ((_x << 24) & ((uint64_t)0xff << 40)) | 88 ((_x << 40) & ((uint64_t)0xff << 48)) | ((_x << 56))); 89 } 90 91 static __inline uint32_t 92 __bswap32_var(uint32_t v) 93 { 94 uint32_t t1; 95 96 __asm __volatile("eor %1, %0, %0, ror #16\n" 97 "bic %1, %1, #0x00ff0000\n" 98 "mov %0, %0, ror #8\n" 99 "eor %0, %0, %1, lsr #8\n" 100 : "+r" (v), "=r" (t1)); 101 102 return (v); 103 } 104 105 static __inline uint16_t 106 __bswap16_var(uint16_t v) 107 { 108 uint32_t ret = v & 0xffff; 109 110 __asm __volatile( 111 "mov %0, %0, ror #8\n" 112 "orr %0, %0, %0, lsr #16\n" 113 "bic %0, %0, %0, lsl #16" 114 : "+r" (ret)); 115 116 return ((uint16_t)ret); 117 } 118 119 #ifdef __OPTIMIZE__ 120 121 #define __bswap32_constant(x) \ 122 ((((x) & 0xff000000U) >> 24) | \ 123 (((x) & 0x00ff0000U) >> 8) | \ 124 (((x) & 0x0000ff00U) << 8) | \ 125 (((x) & 0x000000ffU) << 24)) 126 127 #define __bswap16_constant(x) \ 128 ((((x) & 0xff00) >> 8) | \ 129 (((x) & 0x00ff) << 8)) 130 131 #define __bswap16(x) \ 132 ((uint16_t)(__builtin_constant_p(x) ? \ 133 __bswap16_constant(x) : \ 134 __bswap16_var(x))) 135 136 #define __bswap32(x) \ 137 ((uint32_t)(__builtin_constant_p(x) ? \ 138 __bswap32_constant(x) : \ 139 __bswap32_var(x))) 140 141 #else 142 #define __bswap16(x) __bswap16_var(x) 143 #define __bswap32(x) __bswap32_var(x) 144 145 #endif /* __OPTIMIZE__ */ 146 #endif /* ENDIAN__H */ 147