Lecture_3_Ch_1_Device_Controllers_Interrupts_DMA_.pdf -...

Silberschatz, Galvin and Gagne ©2013
Operating System Concepts – 9 th Edit9on
Lecture 3
Chapter 1: Introduction
Provided & Updated by
Sameer Akram

1.2
Silberschatz, Galvin and Gagne ©2013
Operating System Concepts – 9 th Edition
Computer System Organization

Computer-System Operation

A modern general-purpose computer consists of one or more CPUs and a
number of device controllers connected through common bus that provides
access to shared memory.

Each device controller is in charge of a particular device type.

CPU(s) and the device controllers can execute in parallel, competing for
memory cycles.

1.3
Silberschatz, Galvin and Gagne ©2013
Operating System Concepts – 9 th Edition
Computer System Organization

Computer-system operation

To ensure orderly access to the shared memory, a memory
controller synchronizes access to the memory.

1.4
Silberschatz, Galvin and Gagne ©2013
Operating System Concepts – 9 th Edition
Computer-System Operation

Each device controller is in charge of a particular device type.

Depending on the controller, more than one devices can be attached to it.

Each device controller maintains some local buffer storage and a set of
special-purpose registers.