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Thread: CS609-System Programming Assignment No. 5 [Spring 2010]

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    28 CS609-System Programming Assignment No. 5 [Spring 2010]

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    Assignment [Total Marks 10]

    Write a C program that will translate a CHS address into a LBA address and display it. Take the CHS information from user and use interrupt 13H/48H to get drive parameters.


    Note: Submit .C files only. You have to run this in DOS mode because Windows will not allow you to access hard disk directly.
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    Junior Member Minnow's Avatar
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    28

    Find the solution and make changes.
    Code:
    #include <bios.h>
    #include <dos.h>
    #include <conio.h>
    #include <stdio.h>
    #include <stdlib.h>
    //Structure of result buffer used by extended 13H services.
    struct RESULTBUFFER
    {
        unsigned int size;
        unsigned int infoflags;
        unsigned long int cylinders;
        unsigned long int heads;
        unsigned long int sectors;
        unsigned long int locount;
        unsigned long int hicount;
        unsigned int bytespersector;
        unsigned long int configptr;
    }rb; //If Int 13 returns some value then it will be stored in rb.
     
    //Function to get drive parameters
    void getDriveParameters(unsigned int drive, struct RESULTBUFFER * rbptr)
    {
        _AH = 0x48;   //Service #
        _DL = drive ; //Drive number
        rbptr->size = 30; //Size of result buffer
        _SI = (unsigned int) rbptr; //Offset address of result buffer
        geninterrupt (0x13); //Generate Interrupt 13
    }
     
    void main()
    {
        char input[15];
        //Will be used to store current cylender, head and sector numbers
        unsigned long int lba, cylinder, head , sector;
    
        clrscr();
        //Taking input from user
        puts ("\nEnter the current Cylinder # : ");
        gets (input);
        cylinder = atol(input);
    
        puts ("\nEnter the current Head # : ");
        gets (input);
        head = atol(input);
    
        puts ("\nEnter the current Sector # : ");
        gets (input);
        sector = atol(input);
    
        //Getting drive parameters of Result buffer using Int 13H/48H
        getDriveParameters(0x80,&rb);
    
        //Now we have No. of heads  per cylinder in rb.heads and No. of Sectors per track for the disk in rb.sectors
    
        //Now from the following formula we can calculate the LBA index for the selected CHS index
        lba=( ( cylinder * rb.heads + head ) * rb.sectors ) + sector - 1;
    
        printf("\n\nThe LBA Index for current CHS address : %ld",lba);
        printf("\n\n\n\nPress any key to exit...");
        getch();
    }

  3. #3
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    thanks for the solution. would you like to introduce your self?

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