// vm.cpp            Dave Reed         3/20/06
//
// Virtual Memory Simulator - currently uses FIFO page replacement
///////////////////////////////////////////////////////////////////

#include <iostream>
#include "PagingUnit.h"
using namespace std;

int main()
{
    int logSize;
    cout << "Enter number of pages in logical memory: " << endl;
    cin >> logSize;

    int physSize;
    cout << "Enter number of frames in physical memory: " << endl;
    cin >> physSize;

    PagingUnit MMU(logSize, physSize);            // CREATE THE PAGE TABLE

    int numFaults = 0;

    cout << "Enter the page-reference string (terminated by -1): " << endl;
    int pageNum;
    cin >> pageNum;
    while (pageNum != -1) {						// REPEAT UNTIL END OF INPUT
        if (!MMU.isValid(pageNum)) {			// IF PAGE IS NOT IN MEMORY,
            MMU.loadPage(pageNum);				//   THEN SWAP IT IN
            numFaults++;
        }
        MMU.accessPage(pageNum);				// ACCESS THE PAGE

        cin >> pageNum;                         // READ NEXT INPUT VALUE
    }

    cout << endl << "Total number of page faults = " << numFaults << endl;

    return 0;
}