public void Reset()
{
bool wasExecuting = IsExecuting;
// Save context and stop executing if the system is currently running.
SystemExecutionContext context = null;
if (wasExecuting)
{
context = _currentExecutionContext;
StopExecution();
}
// Now do the actual reset.
_cp.Reset();
_iop.Reset();
_displayController.Reset();
_ethernetController.Reset();
_hardDrive.Reset();
_shugartController.Reset();
// _scheduler.Reset();
_cpCycles = 0;
_elapsedCycles = 0;
// Restart execution if we were running before the reset.
if (wasExecuting)
{
StartExecution(context);
}
}
private void ExecutionWorker(object obj)
{
SystemExecutionContext context = (SystemExecutionContext)obj;
_abortExecution = false;
while (!_abortExecution)
{
try
{
//
// We clock the IOP first and let it run an instruction.
// This returns the number of clock cycles consumed --
// on the 8085's 3Mhz timebase.
//
// We then execute the corresponding number of CP cycles
// (based on a 137ns clock period, or about 7.3Mhz) that would
// occur during that period.
//
int i8085Cycles = _iop.Execute();
// This is inexact and that's probably good enough on average.
_cpCycles = (int)_cpCyclesPer8085Cycle * i8085Cycles;
_cp.ExecuteInstruction(_cpCycles);
if (Configuration.ThrottleSpeed)
{
_elapsedCycles += _cpCycles;
if (_elapsedCycles > _cpCyclesPerField)
{
_elapsedCycles -= _cpCyclesPerField;
if (_frameTimer != null)
{
_frameTimer.WaitForFrame();
}
}
}
}
catch (Exception e)
{
context.ErrorCallback(e);
_abortExecution = true;
}
}
ExecutionStateChanged();
}
public void StartExecution(SystemExecutionContext context)
{
StopExecution();
if (_executionThread == null || !_executionThread.IsAlive)
{
if (context.StepCallback8085 != null &&
context.StepCallbackCP != null &&
context.StepCallbackMesa != null)
{
_executionThread = new Thread(new ParameterizedThreadStart(DebugExecutionWorker));
}
else
{
_executionThread = new Thread(new ParameterizedThreadStart(ExecutionWorker));
}
_executionThread.Start(context);
ExecutionStateChanged();
_currentExecutionContext = context;
}
}
private void DebugExecutionWorker(object obj)
{
SystemExecutionContext context = (SystemExecutionContext)obj;
_abortExecution = false;
bool iopAbort = false;
while (!_abortExecution)
{
try
{
//
// We clock the IOP first and let it run an instruction.
// This returns the number of clock cycles consumed --
// on the 8085's 3Mhz timebase.
//
// We then execute the corresponding number of CP cycles
// (based on a 137ns clock period, or about 7.3Mhz) that would
// occur during that period.
//
if (_cpCycles == 0)
{
if (iopAbort)
{
//
// Out of cycles after an IOP abort, now we actually abort.
//
_abortExecution = true;
}
else
{
int i8085Cycles = _iop.Execute();
// This is inexact and that's probably good enough on average.
_cpCycles = (int)_cpCyclesPer8085Cycle * i8085Cycles;
if (context.StepCallback8085())
{
//
// Set our local iopAbort flag, we still want to continue
// to execute the CP and scheduler for as many microcycles as correspond to the
// above 8085 instruction's execution time to keep things in sync.
//
iopAbort = true;
}
}
}
_cp.ExecuteInstruction(1);
_cpCycles--;
_elapsedCycles++;
if (context.StepCallbackCP())
{
//
// Break on microinstruction step
//
_abortExecution = true;
}
if (_cp.IBDispatch &&
context.StepCallbackMesa())
{
//
// Break on macroinstruction step
//
_abortExecution = true;
}
}
catch (Exception e)
{
context.ErrorCallback(e);
_abortExecution = true;
}
}
_cpCycles = 0;
ExecutionStateChanged();
}
