public void Write(ushort addr, uint value, int size)
{
PIController controller = null;
switch (addr)
{
case 0x20:
case 0x21:
controller = controllers[0];
break;
case 0xa0:
case 0xa1:
controller = controllers[1];
break;
}
Debug.Assert(controller != null, "controller != null");
if (!controller.Init)
{
controller.ProcessICW((byte)value);
}
else if (addr % 0x10 == 0)
{
if (value == 0x20)
{
controller.EOI();
}
controller.CommandRegister = (byte)value;
}
else
{
controller.MaskRegister = (byte)value;
}
}
public uint Read(ushort addr, int size)
{
PIController controller = null;
switch (addr)
{
case 0x20:
case 0x21:
controller = controllers[0];
break;
case 0xa0:
case 0xa1:
controller = controllers[1];
break;
}
Debug.Assert(controller != null, "controller != null");
if ((controller.CommandRegister & 0x3) == 0x3)
{
return(controller.InServiceRegister);
}
return(addr % 10 == 0 ? controller.StatusRegister : controller.DataRegister);
}
public bool RequestInterrupt(byte irq)
{
PIController controller = irq < 8 ? controllers[0] : controllers[1];
if (((controller.MaskRegister >> irq & 0x1)) != 0)
{
return(false);
}
return(controller.RequestInterrupt(irq));
}
public PIC8259()
{
controllers = new PIController[2];
controllers[0] = new PIController();
controllers[1] = new PIController();
}
