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
_OSSwapInt16(__uint16_t _data)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
_OSSwapInt32(__uint32_t _data)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
_OSSwapInt64(__uint64_t _data)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
_OSSwapInt64(__uint64_t _data)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
_OSSwapInt64(__uint64_t _data)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 */
111