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Allows Z80 users to opt out of support for the bus request line. Which both now do.

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This commit is contained in:
Thomas Harte 2017-08-21 20:43:12 -04:00
parent 1237f174fe
commit e1aded0d95
3 changed files with 7 additions and 5 deletions
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2
Machines/AmstradCPC/AmstradCPC.cpp
View File

@ -992,7 +992,7 @@ class ConcreteMachine:
}
}
CPU::Z80::Processor<ConcreteMachine> z80_;
CPU::Z80::Processor<ConcreteMachine, false> z80_;
CRTCBusHandler crtc_bus_handler_;
Motorola::CRTC::CRTC6845<CRTCBusHandler> crtc_;

2
Machines/ZX8081/ZX8081.cpp
View File

@ -330,7 +330,7 @@ class ConcreteMachine:
HalfCycles get_typer_frequency() { return Cycles(390000); }
private:
CPU::Z80::Processor<ConcreteMachine> z80_;
CPU::Z80::Processor<ConcreteMachine, false> z80_;
std::shared_ptr<Video> video_;
std::vector<uint8_t> zx81_rom_, zx80_rom_;

8
Processors/Z80/Z80.hpp
View File

@ -9,6 +9,7 @@
#ifndef Z80_hpp
#define Z80_hpp
#include <cassert>
#include <cstdint>
#include <cstring>
#include <cstdio>
@ -180,7 +181,7 @@ class BusHandler {
order to provide the bus on which the Z80 operates and @c flush(), which is called upon completion of a continuous run
of cycles to allow a subclass to bring any on-demand activities up to date.
*/
template <class T> class Processor {
template <class T, bool uses_bus_request> class Processor {
private:
T &bus_handler_;
@ -910,7 +911,7 @@ template <class T> class Processor {
while(1) {
do_bus_acknowledge:
while(bus_request_line_) {
while(uses_bus_request && bus_request_line_) {
static PartialMachineCycle bus_acknowledge_cycle = {PartialMachineCycle::BusAcknowledge, HalfCycles(2), nullptr, nullptr, false};
number_of_cycles_ -= bus_handler_.perform_machine_cycle(bus_acknowledge_cycle) + HalfCycles(1);
if(!number_of_cycles_) {
@ -946,7 +947,7 @@ template <class T> class Processor {
number_of_cycles_ -= operation->machine_cycle.length;
last_request_status_ = request_status_;
number_of_cycles_ -= bus_handler_.perform_machine_cycle(operation->machine_cycle);
if(bus_request_line_) goto do_bus_acknowledge;
if(uses_bus_request && bus_request_line_) goto do_bus_acknowledge;
break;
case MicroOp::MoveToNextProgram:
advance_operation();
@ -1953,6 +1954,7 @@ template <class T> class Processor {
Sets the logical value of the bus request line.
*/
void set_bus_request_line(bool value) {
assert(uses_bus_request);
bus_request_line_ = value;
}