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Singularity (operating system)
Singularity was an experimental operating system built by Microsoft Research between 2003 and 2010.〔Source code history on (CodePlex )〕 It was designed as a highly-dependable OS in which the kernel, device drivers, and applications were all written in managed code.
== Workings ==
The lowest-level x86 interrupt dispatch code is written in assembly language and C. Once this code has done its job, it invokes the kernel, whose runtime and garbage collector are written in Sing# (an extended version of Spec#, itself an extension of C#) and runs in unprotected mode. The hardware abstraction layer is written in C++ and runs in protected mode. There is also some C code to handle debugging. The computer's BIOS is invoked during the 16-bit real mode bootstrap stage; once in 32-bit mode, Singularity never invokes the BIOS again, but invokes device drivers written in Sing#. During installation, Common Intermediate Language (CIL) opcodes are compiled into x86 opcodes using the Bartok compiler.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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