/// <summary>
/// Define the main memory block according to the preferences.
/// </summary>
/// <param name="preferences"></param>
/// <param name="len"></param>
/// <returns></returns>
public uint DefineMemory(SimulatorPreferences preferences, int len)
{
//extract start of memory address from preferences
uint address = preferences.MemoryStart;
uint stackPointer;
uint programSizeBytes = (uint)((((len * 4) + 1023) / 1024) * 1024);
uint stackSizeBytes = preferences.StackAreaSize * 1024;
uint heapSizeBytes = preferences.HeapAreaSize * 1024;
if (preferences.StackGrowsDown)
{
stackPointer = (uint)(address + programSizeBytes + heapSizeBytes + stackSizeBytes);
heapPointer = (uint)(address + programSizeBytes);
}
else
{
stackPointer = (uint)(address + programSizeBytes);
heapPointer = (uint)(address + programSizeBytes + heapSizeBytes + stackSizeBytes);
}
//compute size of main memory in words
uint sizeWords = (uint)((programSizeBytes + stackSizeBytes + heapSizeBytes) / 4);
//init the main memory block
mMemoryBlock = new MemoryBlock(address, sizeWords, preferences);
mMemoryBlock.HeapStart = heapPointer;
mMemoryBlock.StackStart = stackPointer;
if (preferences.StackGrowsDown)
{
mMemoryBlock.HeapEnd = heapPointer + heapSizeBytes;
mMemoryBlock.StackEnd = stackPointer - stackSizeBytes;
}
else
{
mMemoryBlock.HeapEnd = heapPointer - heapSizeBytes;
mMemoryBlock.StackEnd = stackPointer + stackSizeBytes;
}
return(stackPointer);
}//DefineMemory
public MainMemory(SimulatorPreferences simulatorPreferences) : this()
{
mSimulatorPreferences = simulatorPreferences;
}
