ch13 - Chapter 13: I/O Systems Operating System Concepts...

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Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition, Chapter 13: I/O Systems
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13.2 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Chapter 13: I/O Systems I/O Hardware Application I/O Interface Kernel I/O Subsystem Transforming I/O Requests to Hardware Operations STREAMS Performance
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13.3 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Objectives Explore the structure of an operating system’s I/O subsystem Discuss the principles of I/O hardware and its complexity Provide details of the performance aspects of I/O hardware and software
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13.4 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition I/O Hardware Incredible variety of I/O devices Common concepts Port Bus ( daisy chain or shared direct access) Controller ( host adapter ) I/O instructions control devices Devices have addresses, used by Direct I/O instructions Memory-mapped I/O
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13.5 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition A Typical PC Bus Structure
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13.6 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Device I/O Port Locations on PCs (partial)
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13.7 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Polling Determines state of device command-ready busy Error Busy-wait cycle to wait for I/O from device
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13.8 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Interrupts CPU Interrupt-request line triggered by I/O device Interrupt handler receives interrupts Maskable to ignore or delay some interrupts Interrupt vector to dispatch interrupt to correct handler Based on priority Some nonmaskable Interrupt mechanism also used for exceptions
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13.9 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Interrupt-Driven I/O Cycle
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13.10 Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Intel Pentium Processor Event-Vector Table
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Silberschatz, Galvin and Gagne ©2009 Operating System Concepts – 8 th Edition Direct Memory Access Used to avoid programmed I/O for large data movement
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ch13 - Chapter 13: I/O Systems Operating System Concepts...

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