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 #define _BYTE_ORDER _LITTLE_ENDIAN 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 #define _QUAD_HIGHWORD 1 62 #define _QUAD_LOWWORD 0 63 #define __ntohl(x) (__bswap32(x)) 64 #define __ntohs(x) (__bswap16(x)) 65 #define __htonl(x) (__bswap32(x)) 66 #define __htons(x) (__bswap16(x)) 67 68 static __inline uint64_t 69 __bswap64(uint64_t x) 70 { 71 uint64_t ret; 72 73 __asm __volatile("rev %0, %1\n" 74 : "=&r" (ret), "+r" (x)); 75 76 return (ret); 77 } 78 79 static __inline uint32_t 80 __bswap32_var(uint32_t v) 81 { 82 uint32_t ret; 83 84 __asm __volatile("rev32 %x0, %x1\n" 85 : "=&r" (ret), "+r" (v)); 86 87 return (ret); 88 } 89 90 static __inline uint16_t 91 __bswap16_var(uint16_t v) 92 { 93 uint32_t ret; 94 95 __asm __volatile("rev16 %w0, %w1\n" 96 : "=&r" (ret), "+r" (v)); 97 98 return ((uint16_t)ret); 99 } 100 101 #ifdef __OPTIMIZE__ 102 103 #define __bswap32_constant(x) \ 104 ((((x) & 0xff000000U) >> 24) | \ 105 (((x) & 0x00ff0000U) >> 8) | \ 106 (((x) & 0x0000ff00U) << 8) | \ 107 (((x) & 0x000000ffU) << 24)) 108 109 #define __bswap16_constant(x) \ 110 ((((x) & 0xff00) >> 8) | \ 111 (((x) & 0x00ff) << 8)) 112 113 #define __bswap16(x) \ 114 ((uint16_t)(__builtin_constant_p(x) ? \ 115 __bswap16_constant((uint16_t)(x)) : \ 116 __bswap16_var(x))) 117 118 #define __bswap32(x) \ 119 ((uint32_t)(__builtin_constant_p(x) ? \ 120 __bswap32_constant((uint32_t)(x)) : \ 121 __bswap32_var(x))) 122 123 #else 124 #define __bswap16(x) __bswap16_var(x) 125 #define __bswap32(x) __bswap32_var(x) 126 127 #endif /* __OPTIMIZE__ */ 128 #endif /* ENDIAN__H */ 129