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Adding the WAI and handling NMI & IRQ interrupts

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This commit is contained in:
Anonymus Raccoon
2020-05-14 17:37:06 +02:00
parent 8240fbd54c
commit 5f0ed5f561
3 changed files with 71 additions and 26 deletions
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sources/CPU/CPU.cpp
+31 -4
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@@ -205,13 +205,40 @@ namespace ComSquare::CPU
{
unsigned cycles = 0;
if (this->_isStopped)
return 0xFF;
for (int i = 0; i < 0xFF; i++)
cycles += this->_executeInstruction(this->readPC());
for (int i = 0; i < 0xFF; i++) {
if (this->_isStopped) {
cycles += 1;
continue;
}
this->_checkInterrupts();
if (!this->_isWaitingForInterrupt)
cycles += this->_executeInstruction(this->readPC());
}
return cycles;
}
void CPU::_checkInterrupts()
{
if (!this->IsNMIRequested && !this->IsIRQRequested && !this->IsAbortRequested)
return;
this->_isWaitingForInterrupt = false;
if (this->IsNMIRequested) {
this->_runInterrupt(
this->_cartridgeHeader.nativeInterrupts.nmi,
this->_cartridgeHeader.emulationInterrupts.nmi);
return;
}
if (this->IsIRQRequested && !this->_registers.p.i) {
this->_runInterrupt(
this->_cartridgeHeader.nativeInterrupts.irq,
this->_cartridgeHeader.emulationInterrupts.irq);
return;
}
}
uint24_t CPU::_getValueAddr(Instruction &instruction)
{
switch (instruction.addressingMode) {