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◆ main openmsx / src / memory / MSXMemoryMapperBase.hh
2.4 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#ifndef MSXMEMORYMAPPERBASE_HH
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#define MSXMEMORYMAPPERBASE_HH
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#include "CheckedRam.hh"
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#include "MSXDevice.hh"
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#include "MSXMapperIO.hh"
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#include "SimpleDebuggable.hh"
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#include "narrow.hh"
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#include <array>
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namespace openmsx {
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class MSXMemoryMapperBase : public MSXDevice, public MSXMapperIOClient
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{
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public:
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	explicit MSXMemoryMapperBase(const DeviceConfig& config);
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	/**
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	 * Returns the currently selected segment for the given page.
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	 * @param page Z80 address page (0-3).
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	 */
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	[[nodiscard]] byte getSelectedSegment(byte page) const override { return registers[page]; }
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	[[nodiscard]] unsigned getSizeInBlocks() const {
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		return narrow<unsigned>(checkedRam.size() / 0x4000);
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	}
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	void reset(EmuTime time) override;
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	void powerUp(EmuTime time) override;
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	[[nodiscard]] byte readIO(uint16_t port, EmuTime time) override;
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	[[nodiscard]] byte peekIO(uint16_t port, EmuTime time) const override;
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	[[nodiscard]] byte readMem(uint16_t address, EmuTime time) override;
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	void writeMem(uint16_t address, byte value, EmuTime time) override;
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	[[nodiscard]] const byte* getReadCacheLine(uint16_t start) const override;
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	[[nodiscard]] byte* getWriteCacheLine(uint16_t start) override;
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	[[nodiscard]] byte peekMem(uint16_t address, EmuTime time) const override;
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	[[nodiscard]] unsigned getBaseSizeAlignment() const override;
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	// Subclasses _must_ override this method and
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	//  - call MSXMemoryMapperBase::writeIOImpl()
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	//  - handle CPU cacheline stuff (e.g. invalidate)
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	void writeIO(uint16_t port, byte value, EmuTime time) override = 0;
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	template<typename Archive>
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	void serialize(Archive& ar, unsigned version);
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protected:
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	/** Converts a Z80 address to a RAM address.
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	  * @param address Index in Z80 address space.
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	  * @return Index in RAM address space.
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	  */
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	[[nodiscard]] unsigned calcAddress(uint16_t address) const;
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	[[nodiscard]] unsigned segmentOffset(byte page) const;
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	void writeIOImpl(uint16_t port, byte value, EmuTime time);
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	CheckedRam checkedRam;
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	std::array<byte, 4> registers;
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private:
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	struct Debuggable final : SimpleDebuggable {
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		Debuggable(MSXMotherBoard& motherBoard, const std::string& name);
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		[[nodiscard]] byte read(unsigned address) override;
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		void write(unsigned address, byte value) override;
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		void readBlock(unsigned start, std::span<byte> output) override;
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	} debuggable;
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};
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SERIALIZE_CLASS_VERSION(MSXMemoryMapperBase, 2);
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REGISTER_BASE_NAME_HELPER(MSXMemoryMapperBase, "MemoryMapper"); // keep old name for bw-compat
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} // namespace openmsx
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#endif