MSXMegaRam.hh

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#ifndef MSXMEGARAM_HH
#define MSXMEGARAM_HH
 
#include "MSXDevice.hh"
#include "Ram.hh"
#include "RomBlockDebuggable.hh"
#include <array>
#include <memory>
 
namespace openmsx {
 
class Rom;
 
class MSXMegaRam final : public MSXDevice
{
public:
        explicit MSXMegaRam(const DeviceConfig& config);
        ~MSXMegaRam() override;
 
        void powerUp(EmuTime::param time) override;
        void reset(EmuTime::param time) override;
        [[nodiscard]] byte readMem(word address, EmuTime::param time) override;
        [[nodiscard]] const byte* getReadCacheLine(word address) const override;
        void writeMem(word address, byte value,
                      EmuTime::param time) override;
        [[nodiscard]] byte* getWriteCacheLine(word address) const 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;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        void setBank(byte page, byte block);
 
private:
        const unsigned numBlocks; // must come before ram
        Ram ram;
        const std::unique_ptr<Rom> rom; // can be nullptr
        RomBlockDebuggable romBlockDebug;
        const byte maskBlocks;
        std::array<byte, 4> bank;
        bool writeMode;
        bool romMode;
};
 
} // namespace openmsx
 
#endif