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Started filling an appropriate mask variable with the interrupt request status right now. Which is step one towards implementing interrupts.

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This commit is contained in:
Thomas Harte 2017-06-01 20:34:52 -04:00
parent aab637c9e7
commit 5b43cefb85
1 changed files with 28 additions and 6 deletions
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34
Processors/Z80/Z80.hpp
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@ -182,6 +182,14 @@ template <class T> class Processor: public MicroOpScheduler<MicroOp> {
int number_of_cycles_;
enum Interrupt: uint8_t {
IRQ = 0x01,
NMI = 0x02,
BUSREQ = 0x04,
};
uint8_t request_status_;
bool irq_line_;
uint8_t operation_;
RegisterPair temp16_;
uint8_t temp8_;
@ -1337,10 +1345,12 @@ template <class T> class Processor: public MicroOpScheduler<MicroOp> {
case MicroOp::EI:
iff1_ = iff2_ = true;
if(irq_line_) request_status_ |= Interrupt::IRQ;
break;
case MicroOp::DI:
iff1_ = iff2_ = false;
request_status_ &= ~Interrupt::IRQ;
break;
case MicroOp::IM:
@ -1570,21 +1580,33 @@ template <class T> class Processor: public MicroOpScheduler<MicroOp> {
}
/*!
Sets the logical value of the interrupt line at @c time_offset cycles from now.
Sets the logical value of the interrupt line.
*/
void set_interrupt_line(bool value, int time_offset) {
void set_interrupt_line(bool value) {
// IRQ requests are level triggered and masked.
irq_line_ = value;
if(irq_line_ && iff1_) {
request_status_ |= Interrupt::IRQ;
} else {
request_status_ &= ~Interrupt::IRQ;
}
}
/*!
Sets the logical value of the non-maskable interrupt line at @c time_offset cycles from now.
Sets the logical value of the non-maskable interrupt line.
*/
void set_non_maskable_interrupt_line(bool value, int time_offset) {
void set_non_maskable_interrupt_line(bool value) {
// NMIs are edge triggered and cannot be masked.
if(value) request_status_ |= Interrupt::NMI;
}
/*!
Sets the logical value of the bus request line at @c time_offset cycles from now.
Sets the logical value of the bus request line.
*/
void set_bus_request_line(bool value, int time_offset) {
void set_bus_request_line(bool value) {
// Bus requests are level triggered and cannot be masked.
if(value) request_status_ |= Interrupt::BUSREQ;
else request_status_ &= ~Interrupt::BUSREQ;
}
/*!