public WriteOperationViewModel UpdateMemory(Int32 currentIndex)
{
Int32 updatedMemoryBlock = CacheViewModel.UpdatedMemoryAddress[currentIndex];
Memory[updatedMemoryBlock] = CacheViewModel.CacheLines[currentIndex];
Int32 cacheLineSizeInMemoryBlocks = SimulationParameters.DataSize / MemoryDataSize; //4
CacheViewModel.CurrentMemoryAddress = CacheViewModel.UpdatedMemoryAddress[currentIndex] / cacheLineSizeInMemoryBlocks;
CacheViewModel.DirtyBit[currentIndex] = 0;
var updatedData = new WriteOperationViewModel();
updatedData.Memory = Memory;
updatedData.CacheViewModel = CacheViewModel;
updatedData.IsMemoryUpdated = true;
return(updatedData);
}
public WriteOperationViewModel WriteToMemory()
{
Int32 address = SimulationParameters.Operations[CurrentOperationIndex].Address;
Int32 cacheLineSizeInMemoryBlocks = SimulationParameters.DataSize / MemoryDataSize; //4
Int32 blockIndex = address / cacheLineSizeInMemoryBlocks;
Int32 currentIndex = _GetCurrentIndex();
String newData = SimulationParameters.Operations[CurrentOperationIndex].Data;
var updatedData = new WriteOperationViewModel();
if (SimulationParameters.WritePolicy == WritePolicy.WriteThrough)
{
if (SimulationParameters.WritePolicyAllocate == WritePolicyAllocate.WriteAllocate) //update cache and memory always
{
//miss => update block in memory and bring it to the cache
if (CacheViewModel.Tags == null || CacheViewModel.Tags[currentIndex] != _GetCurrentTag())
{
Memory[blockIndex].Data[address % cacheLineSizeInMemoryBlocks] = newData;
updatedData.UpdatedPlaceInMemoryBlock = address % cacheLineSizeInMemoryBlocks;
CacheViewModel.Tags[currentIndex] = _GetCurrentTag();
CacheViewModel.CacheLines[currentIndex] = Memory[blockIndex];
CacheViewModel.CurrentMemoryAddress = blockIndex;
updatedData.IsCacheUpdated = true;
updatedData.IsMemoryUpdated = true;
}
else
{
//hit => write to cache and memory
Memory[blockIndex].Data[address % cacheLineSizeInMemoryBlocks] = newData;
updatedData.UpdatedPlaceInMemoryBlock = address % cacheLineSizeInMemoryBlocks;
CacheViewModel.CacheLines[currentIndex] = Memory[blockIndex];
CacheViewModel.CurrentMemoryAddress = blockIndex;
updatedData.IsCacheUpdated = true;
updatedData.IsMemoryUpdated = true;
}
}
else if (SimulationParameters.WritePolicyAllocate == WritePolicyAllocate.WriteNoAllocate)
{
//miss => update block in memory, not bringing it to the cache
if (CacheViewModel.Tags == null || CacheViewModel.Tags[currentIndex] != _GetCurrentTag())
{
Memory[blockIndex].Data[address % cacheLineSizeInMemoryBlocks] = newData;
updatedData.UpdatedPlaceInMemoryBlock = address % cacheLineSizeInMemoryBlocks;
updatedData.IsMemoryUpdated = true;
CacheViewModel.CurrentMemoryAddress = blockIndex;
}
else
{
//hit => write to cache and memory
Memory[blockIndex].Data[address % cacheLineSizeInMemoryBlocks] = newData;
updatedData.UpdatedPlaceInMemoryBlock = address % cacheLineSizeInMemoryBlocks;
CacheViewModel.Tags[currentIndex] = _GetCurrentTag();
CacheViewModel.CacheLines[currentIndex] = Memory[blockIndex];
CacheViewModel.CurrentMemoryAddress = blockIndex;
updatedData.IsCacheUpdated = true;
updatedData.IsMemoryUpdated = true;
}
}
}
else if (SimulationParameters.WritePolicy == WritePolicy.WriteBack)
{
if (SimulationParameters.WritePolicyAllocate == WritePolicyAllocate.WriteAllocate)
{
//miss => update block in memory and bring it to cache
if (CacheViewModel.Tags == null || CacheViewModel.Tags[currentIndex] != _GetCurrentTag())
{
Memory[blockIndex].Data[address % cacheLineSizeInMemoryBlocks] = newData;
CacheViewModel.Tags[currentIndex] = _GetCurrentTag();
CacheViewModel.CacheLines[currentIndex] = Memory[blockIndex];
CacheViewModel.CurrentMemoryAddress = blockIndex;
CacheViewModel.UpdatedMemoryAddress[currentIndex] = address;
CacheViewModel.DirtyBit[currentIndex] = 0;
updatedData.IsCacheUpdated = true;
updatedData.IsMemoryUpdated = true;
updatedData.UpdatedPlaceInMemoryBlock = address % cacheLineSizeInMemoryBlocks;
}
else //hit => write to cache, set dirty bit, NO write to memory
{
CacheViewModel.CacheLines[currentIndex].Data[address % cacheLineSizeInMemoryBlocks] = newData;
CacheViewModel.DirtyBit[currentIndex] = 1;
CacheViewModel.UpdatedMemoryAddress[currentIndex] = address;
updatedData.IsCacheUpdated = true;
}
}
else if (SimulationParameters.WritePolicyAllocate == WritePolicyAllocate.WriteNoAllocate)
{
//miss => update memory but don't bring it to cache
if (CacheViewModel.Tags == null || CacheViewModel.Tags[currentIndex] != _GetCurrentTag())
{
Memory[blockIndex].Data[address % cacheLineSizeInMemoryBlocks] = newData;
CacheViewModel.CurrentMemoryAddress = blockIndex;
updatedData.IsMemoryUpdated = true;
updatedData.UpdatedPlaceInMemoryBlock = address % cacheLineSizeInMemoryBlocks;
}
else //hit => write to cache, set dirty bit, NO write to memory
{
CacheViewModel.CacheLines[currentIndex].Data[address % cacheLineSizeInMemoryBlocks] = newData;
CacheViewModel.DirtyBit[currentIndex] = 1;
CacheViewModel.UpdatedMemoryAddress[currentIndex] = address;
updatedData.IsCacheUpdated = true;
}
}
}
updatedData.CacheViewModel = CacheViewModel;
updatedData.Memory = Memory;
return(updatedData);
}
