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Lecture9n - COT 4600 Operating Systems Spring 2011 Click to...

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Click to edit Master subtitle style 8/1/11 Lecture 9 COT 4600 Operating Systems Spring 2011 Dan C. Marinescu Office: HEC 304 Office hours: Tu-Th 5:00 – 6:00 PM
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Lecture 9 8/1/11 n Last time: n Binding and indirection n Generic naming model ¨ Name mapping algorithms ¨ Comparing names; name discovery n Practical design of naming scheme ¨ Contexts ¨ Name overloading n Today: n Computer system organization; operating systems n The hardware layer ¨ Bus sharing ¨ Optimization, DMA n The software layer – the file abstraction n Case studies ¨ UNIX File System ¨ URLs n Next time ¨ Modularity Lecture 9 – Thursday, February 10, 2011 22
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Lecture 9 8/1/11 Computer System Organization n Operating Systems (OS) ° software used to ¨ Control the allocation of resources (hardware and software) ¨ Support user applications ¨ Sandwiched between the hardware layer and the application layer n OS-bypass: the OS does not hide completely the hardware from applications. It only hides dangerous functions such as ¨ I/O operations ¨ Management function n Names ° modularization 33
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Lecture 9 8/1/11 Figure 2.16 from the textbook 44
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Lecture 9 8/1/11 The hardware layer n Modules representing each of the three abstractions (memory, interpreter, communication link) are interconnected by a bus. n The bus 7 a broadcast communication channel, each module hears every transmission. ¨ Control lines ¨ Data lines ¨ Address lines n Each module ¨ is identified by a unique address ¨ has a bus interface n Modules other than processors need a controller.
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