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Computer Organization - Lecture Slides | CS 3204, Study notes of Operating Systems

Virginia Polytechnic Institute and State University (Virginia Tech)Operating Systems
Prof. M. Ali

Chapt 4 Material Type: Notes; Professor: Ali; Class: Operating Systems; Subject: Computer Science; University: Virginia Polytechnic Institute And State University; Term: Unknown 1989;

Typology: Study notes

Pre 2010

Uploaded on 02/13/2009

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int a, b, c, d;
. . .
a = b + c;
d = a - 100;
Source
; Code for a = b + c
load R3,b
load R4,c
add R3,R4
store R3,a
Assembly Language
; Code for d = a - 100
load R4,=100
subtract R3,R4
store R3,d
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Partial preview of the text

Download Computer Organization - Lecture Slides | CS 3204 and more Study notes Operating Systems in PDF only on Docsity!

    

int a, b, c, d;

... a = b + c; d = a - 100;

Source

; Code for a = b + c load R3,b load R4,c add R3,R store R3,a

Assembly Language

; Code for d = a - 100 load R4,= subtract R3,R store R3,d

    

; Code for a = b + c load R3,b load R4,c add R3,R store R3,a

; Code for d = a - 100 load R4,= subtract R3,R store R3,d

Assembly Language

10111001001100โ€ฆ 10111001010000โ€ฆ 10100111001100โ€ฆ 10111010001100โ€ฆ 10111001010000โ€ฆ 10100110001100โ€ฆ 10111001101100โ€ฆ

Machine Language

   

Data might be fetched as a result of execution

    :

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    =

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int a, b, c, d;

... a = b + c; d = a - 100;

Source

; Code for a = b + c load R3,b load R4,c add R3,R store R3,a

Assembly Language

; Code for d = a - 100 load R4,= subtract R3,R store R3,d

    @

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 MAR  MemAddr  CMD  โ€˜Read OPโ€™ > 39?  0 * MDR  Mem[ MAR ]

 MAR  MemAddr  CMD  โ€˜Write OPโ€™ > 39?  0 * Mem[ MAR ]  MDR

    

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write Prints info

    

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OS could provide higher level operations to application than the one Driver presents to it

    

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while (Flag != write) { sleep( X ) }

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issues โ€œwriteโ€

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PC = ; IR = memory[PC]; haltFlag = CLEAR; while(haltFlag not SET) { execute(IR); PC = PC + sizeof(INSTRUCT); IR = memory[PC]; if(InterruptRequest) { memory[0] = PC; PC = memory[1] };

memory[1] contains the address of the interrupt handler

    

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interruptHandler() { saveProcessorState(); for(i=0; i<NumberOfDevices; i++) if(device[i].done) goto deviceHandler(i); /* something wrong if we get to here โ€ฆ */

deviceHandler(int i) { finishOperation(); returnToScheduler(); }

    :

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saveProcessorState() { for(i=0; i<NumberOfRegisters; i++) memory[K+i] = R[i]; for(i=0; i<NumberOfStatusRegisters; i++) memory[K+NumberOfRegisters+i] = StatusRegister[i]; }

PC = ; IR = memory[PC]; haltFlag = CLEAR; while(haltFlag not SET) { execute(IR); PC = PC + sizeof(INSTRUCT); IR = memory[PC]; if(InterruptRequest && InterruptEnabled) { disableInterupts(); memory[0] = PC; PC = memory[1] };

    =

9 $#trap 3 #>+ 4 ,?

executeTrap(argument) { setMode(supervisor); switch(argument) { case 1: PC = memory[1001]; // Trap handler 1 case 2: PC = memory[1002]; // Trap handler 2

... case n: PC = memory[1000+n];// Trap handler n };

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