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 63static __inline__ int _OSRosettaCheck(void) { return 0; } 64 65#define IF_ROSETTA() if (__builtin_expect(_OSRosettaCheck(), 0) ) 66 67#define ROSETTA_ONLY(exprs) \ 68do { \ 69 IF_ROSETTA() { \ 70 exprs \ 71 } \ 72} while(0) 73 74#endif /* _LIBKERN_OSCROSSENDIAN_H */ 75