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Lecture1 - Chapter 1 Introduction Operating System Concepts...

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Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition, Chapter 1: Introduction
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1.2 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Chapter 1: Introduction What Operating Systems Do? Computer-System Organization and Architecture Operating-System Structure and Operations Operating-System Components Process Management Memory Management Storage management Computing Environments Open-Source Operating Systems
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1.3 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Objectives To provide a grand tour of the major operating systems components To provide coverage of basic computer system organization
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1.4 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition What is an Operating System? A program that acts as an intermediary between a user of a computer and the computer hardware Operating system goals: Execute user programs and make solving user problems easier Make the computer system convenient to use Use the computer hardware in an efficient manner
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1.5 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Computer System Structure Computer system can be divided into four components Hardware – provides basic computing resources CPU, memory, I/O devices Operating system Controls and coordinates use of hardware among various applications and users Application programs – define the ways in which the system resources are used to solve the computing problems of the users Word processors, compilers, web browsers, database systems, video games Users People, machines, other computers
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1.6 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Four Components of a Computer System
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1.7 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Computer System Organization Computing resources: One or more CPUs, Memory, devices (disks, mouse, printer, etc), device controllers connect through common bus, bus providing access to all these components
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1.8 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Computer-System Operation I/O devices and the CPU can execute concurrently Each device controller is in charge of a particular device type Each device controller has a local buffer
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1.9 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Computer-System Operation CPU moves data from/to main memory to/from local buffers I/O is from the device to local buffer of controller Device controller informs CPU that it has finished its operation by causing an interrupt
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1.10 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Computer-System Operation: Startup CPU does nothing unless instructed by a program At power-up or reboot a special program called bootstrap program is activated from the on-chip
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