private void HandleInterrupt()
{
switch (State)
{
case State.IRQ_READ_IF:
_interruptFlag = _addressSpace.GetByte(0xff0f);
State = State.IRQ_READ_IE;
break;
case State.IRQ_READ_IE:
_interruptEnabled = _addressSpace.GetByte(0xffff);
_requestedIrq = null;
foreach (var irq in InterruptManager.InterruptType.Values())
{
if ((_interruptFlag & _interruptEnabled & (1 << irq.Ordinal)) != 0)
{
_requestedIrq = irq;
break;
}
}
if (_requestedIrq == null)
{
State = State.OPCODE;
}
else
{
State = State.IRQ_PUSH_1;
_interruptManager.ClearInterrupt(_requestedIrq);
_interruptManager.DisableInterrupts(false);
}
break;
case State.IRQ_PUSH_1:
Registers.DecrementSp();
_addressSpace.SetByte(Registers.SP, (Registers.PC & 0xff00) >> 8);
State = State.IRQ_PUSH_2;
break;
case State.IRQ_PUSH_2:
Registers.DecrementSp();
_addressSpace.SetByte(Registers.SP, Registers.PC & 0x00ff);
State = State.IRQ_JUMP;
break;
case State.IRQ_JUMP:
Registers.PC = _requestedIrq.Handler;
_requestedIrq = null;
State = State.OPCODE;
break;
}
}
public void ClearState()
{
_opcode1 = 0;
_opcode2 = 0;
CurrentOpcode = null;
_ops = null;
_operand[0] = 0x00;
_operand[1] = 0x00;
_operandIndex = 0;
_opIndex = 0;
_opContext = 0;
_interruptFlag = 0;
_interruptEnabled = 0;
_requestedIrq = null;
}
