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Added wait state hooks to the interrupt programs, and added an is_wait query on PartialMachineCycle.

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This commit is contained in:
Thomas Harte 2017-06-22 20:07:47 -04:00
parent f3b1ef99cc
commit f0398a6db8
1 changed files with 19 additions and 9 deletions
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28
Processors/Z80/Z80.hpp
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@ -76,14 +76,16 @@ struct PartialMachineCycle {
Internal,
BusAcknowledge,
ReadStart,
ReadWait,
WriteStart,
WriteWait,
InputStart,
InputWait,
OutputWait,
InterruptWait,
ReadStart,
WriteStart,
InputStart,
OutputStart,
OutputWait
} operation;
int length;
uint16_t *address;
@ -96,6 +98,9 @@ struct PartialMachineCycle {
inline bool is_terminal() const {
return operation <= Operation::BusAcknowledge;
}
inline bool is_wait() const {
return operation >= Operation::ReadWait && operation <= Operation::InterruptWait;
}
};
// Elemental bus operations
@ -115,11 +120,12 @@ struct PartialMachineCycle {
#define InputWait(addr, val, f) {PartialMachineCycle::InputWait, 1, &addr.full, &val, f}
#define InputEnd(addr, val) {PartialMachineCycle::Input, 1, &addr.full, &val, false}
#define OutputStart(addr, val) {PartialMachineCycle::OutputStart, 2, &addr.full, &val}
#define OutputStart(addr, val) {PartialMachineCycle::OutputStart, 2, &addr.full, &val, false}
#define OutputWait(addr, val, f) {PartialMachineCycle::OutputWait, 1, &addr.full, &val, f}
#define OutputEnd(addr, val) {PartialMachineCycle::Output, 1, &addr.full, &val}
#define OutputEnd(addr, val) {PartialMachineCycle::Output, 1, &addr.full, &val, false}
#define IntAck(length, val) {PartialMachineCycle::Interrupt, length, nullptr, &val}
#define IntAck(length, val) {PartialMachineCycle::Interrupt, length, nullptr, &val, false}
#define IntWait(val) {PartialMachineCycle::InterruptWait, 1, nullptr, &val, true}
// A wrapper to express a bus operation as a micro-op
#define BusOp(op) {MicroOp::BusOperation, nullptr, nullptr, op}
@ -134,7 +140,7 @@ struct PartialMachineCycle {
#define Input(addr, val) BusOp(InputStart(addr, val)), BusOp(InputWait(addr, val, false)), BusOp(InputWait(addr, val, true)), BusOp(InputEnd(addr, val))
#define Output(addr, val) BusOp(OutputStart(addr, val)), BusOp(OutputWait(addr, val, false)), BusOp(OutputWait(addr, val, true)), BusOp(OutputEnd(addr, val))
#define InternalOperation(len) {MicroOp::BusOperation, nullptr, nullptr, {PartialMachineCycle::Internal, len}}
#define InternalOperation(len) {MicroOp::BusOperation, nullptr, nullptr, {PartialMachineCycle::Internal, len, nullptr, nullptr, false}}
/// A sequence is a series of micro-ops that ends in a move-to-next-program operation.
#define Sequence(...) { __VA_ARGS__, {MicroOp::MoveToNextProgram} }
@ -800,6 +806,7 @@ template <class T> class Processor {
{ MicroOp::BeginNMI },
BusOp(ReadOpcodeStart()),
BusOp(ReadOpcodeWait(1, false)),
BusOp(ReadOpcodeWait(1, true)),
BusOp(Refresh(2)),
Push(pc_),
{ MicroOp::JumpTo66, nullptr, nullptr},
@ -808,11 +815,13 @@ template <class T> class Processor {
MicroOp irq_mode0_program[] = {
{ MicroOp::BeginIRQMode0 },
BusOp(IntAck(4, operation_)),
BusOp(IntWait(operation_)),
{ MicroOp::DecodeOperationNoRChange }
};
MicroOp irq_mode1_program[] = {
{ MicroOp::BeginIRQ },
BusOp(IntAck(5, operation_)),
BusOp(IntWait(operation_)),
BusOp(Refresh(2)),
Push(pc_),
{ MicroOp::Move16, &temp16_.full, &pc_.full },
@ -821,6 +830,7 @@ template <class T> class Processor {
MicroOp irq_mode2_program[] = {
{ MicroOp::BeginIRQ },
BusOp(IntAck(5, temp16_.bytes.low)),
BusOp(IntWait(temp16_.bytes.low)),
BusOp(Refresh(2)),
Push(pc_),
{ MicroOp::Move8, &ir_.bytes.high, &temp16_.bytes.high },
@ -872,7 +882,7 @@ template <class T> class Processor {
while(1) {
while(bus_request_line_) {
static PartialMachineCycle bus_acknowledge_cycle = {PartialMachineCycle::BusAcknowledge, 1};
static PartialMachineCycle bus_acknowledge_cycle = {PartialMachineCycle::BusAcknowledge, 1, nullptr, nullptr, false};
number_of_cycles_ -= static_cast<T *>(this)->perform_machine_cycle(bus_acknowledge_cycle) + 1;
if(!number_of_cycles_) {
static_cast<T *>(this)->flush();