/* * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * This private header exports 3 APIs. * _OSRosettaCheck() - An inline function that returns true if we are * currently running under Rosetta. * IF_ROSETTA() - Which is used to as a regular conditional * expression that is true only if the current * code is executing in the Rosetta * translation space. * ROSETTA_ONLY(exprs) - Which is used to create a block code that only * executes if we are running in Rosetta. * * for example * * IF_ROSETTA() { * // Do Cross endian swapping of input data * outdata = OSSwap??(indata); * } * else { * // Do straight through * outdata = indata; * } * * outdata = indata; * ROSETTA_ONLY( * // Do Cross endian swapping of input data * outdata = OSSwap??(outdata); * ); */ #ifndef _LIBKERN_OSCROSSENDIAN_H #define _LIBKERN_OSCROSSENDIAN_H #include <sys/sysctl.h> #if __ppc__ static __inline__ int _OSRosettaCheck(void) { int isCrossEndian = 0; int val = 0; size_t size = sizeof val; if (sysctlbyname("sysctl.proc_native", &val, &size, NULL, 0) == -1) isCrossEndian = 0; else isCrossEndian = val ? 0 : 1; return isCrossEndian; } #else /* __ppc__ */ static __inline__ int _OSRosettaCheck(void) { return 0; } #endif /* __ppc__ */ #define IF_ROSETTA() if (__builtin_expect(_OSRosettaCheck(), 0) ) #define ROSETTA_ONLY(exprs) \ do { \ IF_ROSETTA() { \ exprs \ } \ } while(0) #endif /* _LIBKERN_OSCROSSENDIAN_H */