MSXMemoryMapperBase.hh

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#ifndef MSXMEMORYMAPPERBASE_HH
#define MSXMEMORYMAPPERBASE_HH
 
#include "MSXDevice.hh"
#include "MSXMapperIO.hh"
#include "CheckedRam.hh"
#include "SimpleDebuggable.hh"
#include "narrow.hh"
#include <array>
 
namespace openmsx {
 
class MSXMemoryMapperBase : public MSXDevice, public MSXMapperIOClient
{
public:
        explicit MSXMemoryMapperBase(const DeviceConfig& config);
 
        [[nodiscard]] byte getSelectedSegment(byte page) const override { return registers[page]; }
 
        [[nodiscard]] unsigned getSizeInBlocks() const {
                return narrow<unsigned>(checkedRam.size() / 0x4000);
        }
 
        void reset(EmuTime::param time) override;
        void powerUp(EmuTime::param time) override;
        [[nodiscard]] byte readIO(word port, EmuTime::param time) override;
        [[nodiscard]] byte peekIO(word port, 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) override;
        [[nodiscard]] byte peekMem(word address, EmuTime::param time) const override;
        [[nodiscard]] unsigned getBaseSizeAlignment() const override;
 
        // Subclasses _must_ override this method and
        //  - call MSXMemoryMapperBase::writeIOImpl()
        //  - handle CPU cacheline stuff (e.g. invalidate)
        void writeIO(word port, byte value, EmuTime::param time) override = 0;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
protected:
        [[nodiscard]] unsigned calcAddress(word address) const;
        [[nodiscard]] unsigned segmentOffset(byte page) const;
 
        void writeIOImpl(word port, byte value, EmuTime::param time);
 
        CheckedRam checkedRam;
        std::array<byte, 4> registers;
 
private:
        struct Debuggable final : SimpleDebuggable {
                Debuggable(MSXMotherBoard& motherBoard, const std::string& name);
                [[nodiscard]] byte read(unsigned address) override;
                void write(unsigned address, byte value) override;
        } debuggable;
};
SERIALIZE_CLASS_VERSION(MSXMemoryMapperBase, 2);
 
REGISTER_BASE_NAME_HELPER(MSXMemoryMapperBase, "MemoryMapper"); // keep old name for bw-compat
 
} // namespace openmsx
 
#endif