/// <summary>
/// This function swaps in this memory page
/// </summary>
/// <param name="LocationToSwap"> the physical address to swap this page in to</param>
/// <param name="FrameNumber"> this pages frame number</param>
public void SwapIn(int LocationToSwap, int FrameNumber)
{
MemoryPage temp;
dynamic wind = GetMainWindowInstance();
PhysicalMemory physicalMemory = wind.Memory; // get a reference to physical memory from the main window
SwapSpace swap = wind.SwapSpace;
temp = swap.SwappedMemoryPages.Where(x => x.StartOffset
== physicalMemory.Table.Entries[FrameNumber].Page.startOffset).FirstOrDefault();
int index = swap.SwappedMemoryPages.IndexOf(temp);
if (physicalMemory.Table.Entries[FrameNumber].SwappedOut)// if this memory page is not already swapped in
{
physicalMemory.Table.Entries[FrameNumber].SwappedOut = false;
physicalMemory.Table.Entries[FrameNumber].Faults++;
for (int i = 0; i < temp.data.Length; i++)
{
temp.data[i].PhysicalAddress = (frameNumber * MemoryPage.PAGE_SIZE) * (i * 8);
}
physicalMemory.Pages.Add(temp);
swap.SwappedMemoryPages.RemoveAt(GetIndexSwap(FrameNumber));
}
else
{
MessageBox.Show("Cannot swap in page that is already in memory", "ERROR", MessageBoxButton.OK,
MessageBoxImage.Error);
}
}
/// <summary>
/// Constructor for physical memory
/// </summary>
/// <param name="capacity"> capacity of physical memory in pages</param>
public PhysicalMemory(int capacity)
{
this.capacity = capacity;
pages = new List <MemoryPage>(capacity);
pageTable = new PageTable(1);
swapSpace = new SwapSpace();
}
/// <summary>
/// This function swaps in this memory page
/// </summary>
/// <param name="LocationToSwap"> the physical address to swap this page in to</param>
/// <param name="FrameNumber"> this pages frame number</param>
public void SwapIn(int LocationToSwap, int FrameNumber)
{
MemoryPage temp;
dynamic wind = GetMainWindowInstance();
PhysicalMemory physicalMemory = wind.Memory;
SwapSpace swap = wind.SwapSpace;
temp = swap.SwappedMemoryPages[FrameNumber];
if (physicalMemory.Table.Entries[FrameNumber].SwappedOut)
{
physicalMemory.Table.Entries[FrameNumber].SwappedOut = false;
physicalMemory.Table.Entries[FrameNumber].Faults++;
for (int i = 0; i < temp.Data.Length; i++)
{
temp.Data[i].PhysicalAddress = (FrameNumber * MemoryPage.PAGE_SIZE) * (i * 8);
}
physicalMemory.Pages.Add(temp);
swap.SwappedMemoryPages.RemoveAt(GetIndexSwap(FrameNumber));
}
else
{
MessageBox.Show("Cannot swap in page that is already in memory", "ERROR", MessageBoxButton.OK,
MessageBoxImage.Error);
}
}
private int GetIndexSwap(int frameNumber)
{
dynamic wind = GetMainWindowInstance();
SwapSpace swap = wind.SwapSpace;
int index =
swap.SwappedMemoryPages.IndexOf(
swap.SwappedMemoryPages.Where(x => x.FrameNumber == frameNumber).FirstOrDefault());
return(index);
}
/// <summary>
/// This function swaps out this memory page
/// </summary>
/// <param name="LocationToSwap"> the physical address to swap from</param>
/// <param name="FrameNumber"> this page's frame number</param>
public void SwapOut(int LocationToSwap, int FrameNumber)
{
MemoryPage temp;
dynamic wind = GetMainWindowInstance();
PhysicalMemory physicalMemory = wind.Memory; // get a reference to physical memory from the main window
SwapSpace swap = wind.SwapSpace;
temp = physicalMemory.Pages[GetIndexMemory(FrameNumber)];
if (!physicalMemory.Table.Entries[FrameNumber].SwappedOut) // if this memory page is not already swapped out
{
physicalMemory.Table.Entries[FrameNumber].SwappedOut = true;
physicalMemory.Table.Entries[FrameNumber].Faults++;
physicalMemory.Pages.RemoveAt(GetIndexMemory(FrameNumber));
swap.SwappedMemoryPages.Add(temp);
}
else
{
MessageBox.Show("Cannot swap out page that is already swapped out", "ERROR", MessageBoxButton.OK,
MessageBoxImage.Error);
}
}