1 /*
2 * Copyright (c) 2000-2005 Apple Computer, 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_OSBYTEORDERMACHINE_H
30 #define _OS_OSBYTEORDERMACHINE_H
31
32 #include <stdint.h>
33
34 #if !defined(OS_INLINE)
35 # if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
36 # define OS_INLINE static inline
37 # elif defined(__MWERKS__) || defined(__cplusplus)
38 # define OS_INLINE static inline
39 # else
40 # define OS_INLINE static __inline__
41 # endif
42 #endif
43
44 /* Generic byte swapping functions. */
45
46 OS_INLINE
47 uint16_t
_OSSwapInt16(uint16_t data)48 _OSSwapInt16(
49 uint16_t data
50 )
51 {
52 return OSSwapConstInt16(data);
53 }
54
55 OS_INLINE
56 uint32_t
_OSSwapInt32(uint32_t data)57 _OSSwapInt32(
58 uint32_t data
59 )
60 {
61 return OSSwapConstInt32(data);
62 }
63
64 OS_INLINE
65 uint64_t
_OSSwapInt64(uint64_t data)66 _OSSwapInt64(
67 uint64_t data
68 )
69 {
70 return OSSwapConstInt64(data);
71 }
72
73 /* Functions for byte reversed loads. */
74
75 OS_INLINE
76 uint16_t
OSReadSwapInt16(const volatile void * base,uintptr_t byteOffset)77 OSReadSwapInt16(
78 const volatile void * base,
79 uintptr_t byteOffset
80 )
81 {
82 uint16_t data = *(volatile uint16_t *)((uintptr_t)base + byteOffset);
83 return _OSSwapInt16(data);
84 }
85
86 OS_INLINE
87 uint32_t
OSReadSwapInt32(const volatile void * base,uintptr_t byteOffset)88 OSReadSwapInt32(
89 const volatile void * base,
90 uintptr_t byteOffset
91 )
92 {
93 uint32_t data = *(volatile uint32_t *)((uintptr_t)base + byteOffset);
94 return _OSSwapInt32(data);
95 }
96
97 OS_INLINE
98 uint64_t
OSReadSwapInt64(const volatile void * base,uintptr_t byteOffset)99 OSReadSwapInt64(
100 const volatile void * base,
101 uintptr_t byteOffset
102 )
103 {
104 uint64_t data = *(volatile uint64_t *)((uintptr_t)base + byteOffset);
105 return _OSSwapInt64(data);
106 }
107
108 /* Functions for byte reversed stores. */
109
110 OS_INLINE
111 void
OSWriteSwapInt16(volatile void * base,uintptr_t byteOffset,uint16_t data)112 OSWriteSwapInt16(
113 volatile void * base,
114 uintptr_t byteOffset,
115 uint16_t data
116 )
117 {
118 *(volatile uint16_t *)((uintptr_t)base + byteOffset) = _OSSwapInt16(data);
119 }
120
121 OS_INLINE
122 void
OSWriteSwapInt32(volatile void * base,uintptr_t byteOffset,uint32_t data)123 OSWriteSwapInt32(
124 volatile void * base,
125 uintptr_t byteOffset,
126 uint32_t data
127 )
128 {
129 *(volatile uint32_t *)((uintptr_t)base + byteOffset) = _OSSwapInt32(data);
130 }
131
132 OS_INLINE
133 void
OSWriteSwapInt64(volatile void * base,uintptr_t byteOffset,uint64_t data)134 OSWriteSwapInt64(
135 volatile void * base,
136 uintptr_t byteOffset,
137 uint64_t data
138 )
139 {
140 *(volatile uint64_t *)((uintptr_t)base + byteOffset) = _OSSwapInt64(data);
141 }
142
143 #endif /* ! _OS_OSBYTEORDERMACHINE_H */
144