_OSByteOrder.h (2830B) - Raw
1 /* 2 * Copyright (c) 2006-2023 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29 #ifndef _OS__OSBYTEORDERI386_H 30 #define _OS__OSBYTEORDERI386_H 31 32 #if defined(__i386__) || defined(__x86_64__) 33 34 #include <sys/_types.h> 35 36 #if !defined(__DARWIN_OS_INLINE) 37 # if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L 38 # define __DARWIN_OS_INLINE static inline 39 # elif defined(__MWERKS__) || defined(__cplusplus) 40 # define __DARWIN_OS_INLINE static inline 41 # else 42 # define __DARWIN_OS_INLINE static __inline__ 43 # endif 44 #endif 45 46 /* Generic byte swapping functions. */ 47 48 __DARWIN_OS_INLINE 49 __uint16_t 50 _OSSwapInt16( 51 __uint16_t _data 52 ) 53 { 54 return (__uint16_t)((_data << 8) | (_data >> 8)); 55 } 56 57 __DARWIN_OS_INLINE 58 __uint32_t 59 _OSSwapInt32( 60 __uint32_t _data 61 ) 62 { 63 #if defined(__llvm__) 64 return __builtin_bswap32(_data); 65 #else 66 __asm__ ("bswap %0" : "+r" (_data)); 67 return _data; 68 #endif 69 } 70 71 #if defined(__llvm__) 72 __DARWIN_OS_INLINE 73 __uint64_t 74 _OSSwapInt64( 75 __uint64_t _data 76 ) 77 { 78 return __builtin_bswap64(_data); 79 } 80 81 #elif defined(__i386__) 82 __DARWIN_OS_INLINE 83 __uint64_t 84 _OSSwapInt64( 85 __uint64_t _data 86 ) 87 { 88 __asm__ ("bswap %%eax\n\t" 89 "bswap %%edx\n\t" 90 "xchgl %%eax, %%edx" 91 : "+A" (_data)); 92 return _data; 93 } 94 #elif defined(__x86_64__) 95 __DARWIN_OS_INLINE 96 __uint64_t 97 _OSSwapInt64( 98 __uint64_t _data 99 ) 100 { 101 __asm__ ("bswap %0" : "+r" (_data)); 102 return _data; 103 } 104 #else 105 #error Unknown architecture 106 #endif 107 108 #endif /* defined(__i386__) || defined(__x86_64__) */ 109 110 #endif /* ! _OS__OSBYTEORDERI386_H */