1 /*
2 * Copyright (c) 2000-2006 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 /*
30 * This private header exports 3 APIs.
31 * _OSRosettaCheck() - An inline function that returns true if we are
32 * currently running under Rosetta.
33 * IF_ROSETTA() - Which is used to as a regular conditional
34 * expression that is true only if the current
35 * code is executing in the Rosetta
36 * translation space.
37 * ROSETTA_ONLY(exprs) - Which is used to create a block code that only
38 * executes if we are running in Rosetta.
39 *
40 * for example
41 *
42 * IF_ROSETTA() {
43 * // Do Cross endian swapping of input data
44 * outdata = OSSwap??(indata);
45 * }
46 * else {
47 * // Do straight through
48 * outdata = indata;
49 * }
50 *
51 * outdata = indata;
52 * ROSETTA_ONLY(
53 * // Do Cross endian swapping of input data
54 * outdata = OSSwap??(outdata);
55 * );
56 */
57
58 #ifndef _LIBKERN_OSCROSSENDIAN_H
59 #define _LIBKERN_OSCROSSENDIAN_H
60
61 #include <sys/sysctl.h>
62
63 static __inline__ int
_OSRosettaCheck(void)64 _OSRosettaCheck(void)
65 {
66 return 0;
67 }
68
69 #define IF_ROSETTA() if (__builtin_expect(_OSRosettaCheck(), 0) )
70
71 #define ROSETTA_ONLY(exprs) \
72 do { \
73 IF_ROSETTA() { \
74 exprs \
75 } \
76 } while(0)
77
78 #endif /* _LIBKERN_OSCROSSENDIAN_H */
79