Evolution of the CHORUS open microkernel architecture: the STREAM project

The CHORUS open microkernel technology is being extended to address the specific needs of real-time embedded systems. This effort results from a concerted action between telecommunication systems manufacturers, hardware technology providers, and Chorus Systems. It is performed in the context of the STREAM project, supported by the European Union Esprit Program. This paper outlines the decomposition of the CHORUS open microkernel into a family of upward compatible system components intended to support a fully scaleable open operating system, as required by modern telecommunications and other embedded systems. Instances of the resulting CHORUS open microkernel family will range from a primitive 10 K nanokernel comprising a simple core executive, with flat memory management, up to a fully functional microkernel able to support transparently distributed market-standard UNIX implementations