projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 3a60a9f5 | 1 | /* |
| 5d5c5d0d | 2 | * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. |
| 3a60a9f5 | 3 | * |
| 8ad349bb | 4 | * @APPLE_LICENSE_OSREFERENCE_HEADER_START@ |
| 3a60a9f5 | 5 | * |
| 8ad349bb A |
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 | |
| 10 | * License may not be used to create, or enable the creation or | |
| 11 | * redistribution of, unlawful or unlicensed copies of an Apple operating | |
| 12 | * system, or to circumvent, violate, or enable the circumvention or | |
| 13 | * violation of, any terms of an Apple operating system software license | |
| 14 | * agreement. | |
| 15 | * | |
| 16 | * Please obtain a copy of the License at | |
| 17 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 18 | * file. | |
| 19 | * | |
| 20 | * The Original Code and all software distributed under the License are | |
| 21 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 22 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 23 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 24 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 25 | * Please see the License for the specific language governing rights and | |
| 26 | * limitations under the License. | |
| 27 | * | |
| 28 | * @APPLE_LICENSE_OSREFERENCE_HEADER_END@ | |
| 3a60a9f5 A |
29 | */ |
| 30 | ||
| 31 | /* | |
| 32 | * This private header exports 3 APIs. | |
| 33 | * _OSRosettaCheck() - An inline function that returns true if we are | |
| 34 | * currently running under Rosetta. | |
| 35 | * IF_ROSETTA() - Which is used to as a regular conditional | |
| 36 | * expression that is true only if the current | |
| 37 | * code is executing in the Rosetta | |
| 38 | * translation space. | |
| 39 | * ROSETTA_ONLY(exprs) - Which is used to create a block code that only | |
| 40 | * executes if we are running in Rosetta. | |
| 41 | * | |
| 42 | * for example | |
| 43 | * | |
| 44 | * IF_ROSETTA() { | |
| 45 | * // Do Cross endian swapping of input data | |
| 46 | * outdata = OSSwap??(indata); | |
| 47 | * } | |
| 48 | * else { | |
| 49 | * // Do straight through | |
| 50 | * outdata = indata; | |
| 51 | * } | |
| 52 | * | |
| 53 | * outdata = indata; | |
| 54 | * ROSETTA_ONLY( | |
| 55 | * // Do Cross endian swapping of input data | |
| 56 | * outdata = OSSwap??(outdata); | |
| 57 | * ); | |
| 58 | */ | |
| 59 | ||
| 60 | #ifndef _LIBKERN_OSCROSSENDIAN_H | |
| 61 | #define _LIBKERN_OSCROSSENDIAN_H | |
| 62 | ||
| 5d5c5d0d A |
63 | #include <sys/sysctl.h> |
| 64 | ||
| 3a60a9f5 A |
65 | #if __ppc__ |
| 66 | ||
| 5d5c5d0d A |
67 | static __inline__ int |
| 68 | _OSRosettaCheck(void) | |
| 3a60a9f5 | 69 | { |
| 5d5c5d0d A |
70 | int isCrossEndian = 0; |
| 71 | int val = 0; | |
| 72 | size_t size = sizeof val; | |
| 3a60a9f5 | 73 | |
| 5d5c5d0d A |
74 | if (sysctlbyname("sysctl.proc_native", &val, &size, NULL, 0) == -1) |
| 75 | isCrossEndian = 0; | |
| 76 | else | |
| 77 | isCrossEndian = val ? 0 : 1; | |
| 3a60a9f5 | 78 | |
| 5d5c5d0d | 79 | return isCrossEndian; |
| 3a60a9f5 A |
80 | } |
| 81 | ||
| 5d5c5d0d | 82 | #else /* __ppc__ */ |
| 3a60a9f5 A |
83 | |
| 84 | static __inline__ int _OSRosettaCheck(void) { return 0; } | |
| 85 | ||
| 5d5c5d0d | 86 | #endif /* __ppc__ */ |
| 3a60a9f5 A |
87 | |
| 88 | #define IF_ROSETTA() if (__builtin_expect(_OSRosettaCheck(), 0) ) | |
| 89 | ||
| 90 | #define ROSETTA_ONLY(exprs) \ | |
| 91 | do { \ | |
| 92 | IF_ROSETTA() { \ | |
| 93 | exprs \ | |
| 94 | } \ | |
| 95 | } while(0) | |
| 96 | ||
| 97 | #endif /* _LIBKERN_OSCROSSENDIAN_H */ |