MusicalMemoryMapper.hh

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#ifndef MUSICALMEMORYMAPPER_HH
#define MUSICALMEMORYMAPPER_HH
 
#include "MSXMemoryMapperBase.hh"
#include "SN76489.hh"
 
namespace openmsx {
 
class MusicalMemoryMapper final : public MSXMemoryMapperBase
{
public:
        MusicalMemoryMapper(const DeviceConfig& config);
 
        void reset(EmuTime::param time) override;
        [[nodiscard]] byte readIO(word port, EmuTime::param time) override;
        [[nodiscard]] byte peekIO(word port, EmuTime::param time) const override;
        void writeIO(word port, byte value, EmuTime::param time) override;
        [[nodiscard]] byte peekMem(word address, EmuTime::param time) const override;
        [[nodiscard]] byte readMem(word address, EmuTime::param time) override;
        void writeMem(word address, byte value, EmuTime::param time) override;
        [[nodiscard]] const byte* getReadCacheLine(word start) const override;
        [[nodiscard]] byte* getWriteCacheLine(word start) const override;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        [[nodiscard]] int readReg(word address) const;
 
        [[nodiscard]] bool registerAccessAt(word address) const;
 
        [[nodiscard]] bool writeProtected(word address) const {
                unsigned page = address >> 14;
                return (controlReg & (1 << page)) != 0;
        }
 
        void updateControlReg(byte value);
 
private:
        SN76489 sn76489;
        byte controlReg = 0;
};
 
} // namespace openmsx
 
#endif