IRQHelper.hh

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#ifndef IRQHELPER_HH
#define IRQHELPER_HH
 
#include "Probe.hh"
#include "MSXMotherBoard.hh"
#include "serialize.hh"
#include <string>
 
namespace openmsx {
 
class MSXCPU;
class DeviceConfig;
 
// policy class for IRQ source
class IRQSource
{
protected:
        explicit IRQSource(MSXCPU& cpu);
        void raise();
        void lower();
private:
        MSXCPU& cpu;
};
 
// supports <irq_connected> tag in hardware config
class OptionalIRQ
{
protected:
        OptionalIRQ(MSXCPU& cpu, const DeviceConfig& config);
        void raise();
        void lower();
private:
        MSXCPU& cpu;
        enum Type { NotConnected, Maskable, NonMaskable };
        const Type type;
};
 
 
// generic implementation
template<typename SOURCE> class IntHelper : public SOURCE
{
public:
        IntHelper(const IntHelper&) = delete;
        IntHelper& operator=(const IntHelper&) = delete;
 
        template<typename ...Args>
        IntHelper(MSXMotherBoard& motherboard, const std::string& name,
                  Args&& ...args)
                : SOURCE(motherboard.getCPU(), std::forward<Args>(args)...)
                , request(motherboard.getDebugger(), name,
                          "Outgoing IRQ signal.", false)
        {
        }
 
        ~IntHelper() {
                reset();
        }
 
        inline void set() {
                if (!request) {
                        request = true;
                        SOURCE::raise();
                }
        }
 
        inline void reset() {
                if (request) {
                        request = false;
                        SOURCE::lower();
                }
        }
 
        inline void set(bool s) {
                if (s) {
                        set();
                } else {
                        reset();
                }
        }
 
        [[nodiscard]] inline bool getState() const {
                return request;
        }
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned /*version*/)
        {
                bool pending = request;
                ar.serialize("pending", pending);
                if constexpr (Archive::IS_LOADER) {
                        set(pending);
                }
        }
 
private:
        Probe<bool> request;
};
 
// convenience types
using IRQHelper         = IntHelper<IRQSource>;
using OptionalIRQHelper = IntHelper<OptionalIRQ>;
 
} // namespace openmsx
 
#endif