A Case for Nano-Kernels
نویسندگان
چکیده
The Choices operating system splits the microkernel into a machine-independent part and a machine-dependent sub-microkernel. The sub-microkernel, called the nano-kernel in Choices, encapsulates the hardware and presents an idealized machine architecture to the rest of the system. Higher levels of the system access the nano-kernel through a single interface. Nano-kernels are useful because they significantly enhance portability of the entire microkernel. The interface provided by the idealized machine architecture of the Choices nano-kernel is a good match for constructing higher-level abstractions in the machine-independent microkernel. In the Choices nano-kernel, we have fully decoupled the nano-kernel from all higher-level abstractions. Thus, it should be possible to construct many diierent operating systems on top of the nano-kernel. The Choices nano-kernel is built as an object-oriented framework. The framework guides porting to new hardware platforms, and allows the specialization of its components for eecient, machine-speciic implementation.
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