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OPERATING SYSTEMS DESIGN AND IMPLEMENTATION Third Edition ANDREW S. TANENBAUM ALBERT S. WOODHULL Yan hao (Wilson) Wu [email protected] University of the Western Cape Computer Science Department Minix Structure From: Free Software Bazaar '06 2 Jorrit N. Herder THE MINIX 3 USERMODE SERVERS AND DRIVERS Monolithic Kernel vs. Microkernel Feature/Kernel type Modularity Flexibility Maintainability Security Compatibility Performance Monolithic Kernel Microkernel Characteristics of Minix ● Minimal kernel to support user-mode OS – Stable kernel (~4000 LoC) reduces number of fatal bugs ● User-mode modules are physically isolated by MMU – Memory access must be explicitly granted by other party ● Privileges of each components are strongly restricted – Policies for IPC, kernel calls, I/O, memory, scheduling Minix Future ● Reliability and security become more important! – E.g., think of banking on embedded devices ● Starting to become useful operating system – E.g., recently the X Window System was ported ● Open source project (under BSD license) – You can inspect, modify, contribute, etc. Resources for Minix www.minix3.org Towards a True Microkernel Operating System, Master's Thesis, Vrije Universiteit, Amsterdam, The Netherlands, Feb. 2005.
