public DataStruct searchForRow(int row, DataStruct head)
{
for (int i = 0; i < head.Count; i++)
{
if (head.row == row)
{
//found it
return(head);
}
}
//if we get here, didn't find it
return(null);
}
public void write(ref BusPacket busPacket)
{
//TODO: move all the error checking to BusPacket so once we have a bus packet,
// we know the fields are all legal
if (busPacket.column >= Config.dram_config.NUM_COLS)
{
if (Config.DEBUG_MEMORY)
{
DEBUG.WriteLine("== Error - Bus Packet column " + busPacket.column + " out of bounds");
}
Environment.Exit(-1);
}
// head of the list we need to search
DataStruct rowHeadNode = rowEntries[(int)busPacket.column];
DataStruct foundNode = null;
if ((foundNode = searchForRow((int)busPacket.row, rowHeadNode)) == null)
{
//not found
DataStruct newRowNode = new DataStruct();
//insert at the head for speed
//TODO: Optimize this data structure for speedier lookups?
newRowNode.row = (int)busPacket.row;
newRowNode.data = busPacket.data;
rowEntries[(int)busPacket.column].AddFirst(newRowNode);
}
else
{
// found it, just plaster in the new data
foundNode.data = busPacket.data;
if (Config.dram_config.DEBUG_BANKS)
{
if (Config.DEBUG_MEMORY)
{
DEBUG.WriteLine(" -- Bank " + busPacket.bank + " writing to physical address 0x" + busPacket.physicalAddress.ToString("x") + ":");
}
busPacket.printData();
if (Config.DEBUG_MEMORY)
{
DEBUG.WriteLine("");
}
}
}
}
public void read(ref BusPacket busPacket)
{
DataStruct rowHeadNode = rowEntries[(int)busPacket.column];
DataStruct foundNode = null;
if ((foundNode = searchForRow((int)busPacket.row, rowHeadNode)) == null)
{
// the row hasn't been written before, so it isn't in the list
UInt64 garbage = (Config.dram_config.BL * (Config.dram_config.JEDEC_DATA_BUS_BITS / 8));
busPacket.data = garbage;
}
else
{
// found it
busPacket.data = foundNode.data;
}
//the return packet should be a data packet, not a read packet
busPacket.busPacketType = BusPacketType.DATA;
}
