CS609-System Programming Assignment No. 5 [Spring 2010]
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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(); }
