![]() The result is a heavily modified (hybrid) OSFMK 7.3 kernel, Apple licensed OSFMK 7.3, which is a microkernel, from the OSF. With macOS, the designers have attempted to streamline some tasks and thus BSD functions were built into the core with Mach. As such, it is able to run the core of an operating system as separated processes, which allows a great flexibility (it could run several operating systems in parallel above the Mach core), but this often reduces performance because of time-consuming kernel/user mode context switches and overhead stemming from mapping or copying messages between the address spaces of the kernel and that of the service daemons. The basis of the XNU kernel is a heavily modified (hybrid) Open Software Foundation Mach kernel ( OSFMK) 7.3. Support for IA-32 was removed as of the version in Mac OS X 10.7 support for 32-bit ARM was removed as of the version in iOS 11. PowerPC support was removed as of the version in Mac OS X 10.6. ![]() XNU is a hybrid kernel, containing features of both monolithic kernels and microkernels, attempting to make the best use of both technologies, such as the message passing ability of microkernels enabling greater modularity and larger portions of the OS to benefit from memory protection, and retaining the speed of monolithic kernels for some critical tasks.Īs of 2021, XNU runs on ARM64 and x86-64 processors, both one processor and symmetric multiprocessing (SMP) models.
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