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◆ main openmsx / src / fdc / DiskDrive.hh
3.9 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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#ifndef DISKDRIVE_HH
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#define DISKDRIVE_HH
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#include "EmuTime.hh"
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#include "RawTrack.hh"
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#include <cstdint>
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namespace openmsx {
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/**
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 * This (abstract) class defines the DiskDrive interface
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 */
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class DiskDrive
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{
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public:
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	enum class TrackMode : uint8_t {
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		NORMAL, YAMAHA_FD_03,
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	};
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public:
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	static constexpr unsigned ROTATIONS_PER_SECOND = 5; // 300rpm
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	virtual ~DiskDrive() = default;
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	/** Is drive ready?
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	 */
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	[[nodiscard]] virtual bool isDiskInserted() const = 0;
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	/** Is disk write protected?
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	 */
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	[[nodiscard]] virtual bool isWriteProtected() const = 0;
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	/** Is disk double sided?
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	 */
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	[[nodiscard]] virtual bool isDoubleSided() = 0;
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	/** Head above track 0
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	 */
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	[[nodiscard]] virtual bool isTrack00() const = 0;
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	/** Side select.
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	 * @param side false = side 0,
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	 *             true  = side 1.
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	 */
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	virtual void setSide(bool side) = 0;
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	/* Returns the previously selected side.
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	 */
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	[[nodiscard]] virtual bool getSide() const = 0;
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	/** Step head
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	 * @param direction false = out,
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	 *                  true  = in.
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	 * @param time The moment in emulated time this action takes place.
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	 */
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	virtual void step(bool direction, EmuTime time) = 0;
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	/** Set motor on/off
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	 * @param status false = off,
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	 *               true  = on.
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	 * @param time The moment in emulated time this action takes place.
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	 */
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	virtual void setMotor(bool status, EmuTime time) = 0;
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	/** Returns the previously set motor status.
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	 */
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	[[nodiscard]] virtual bool getMotor() const = 0;
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	/** Gets the state of the index pulse.
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	 * @param time The moment in emulated time to get the pulse state for.
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	 */
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	[[nodiscard]] virtual bool indexPulse(EmuTime time) = 0;
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	/** Return the time till the start of the next index pulse
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	 * When there is no disk in the drive or when the disk is not spinning,
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	 * this function returns the current time.
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	 * @param time The current time
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	 * @param count Number of required index pulses.
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	 */
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	[[nodiscard]] virtual EmuTime getTimeTillIndexPulse(EmuTime time, int count = 1) = 0;
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	[[nodiscard]] virtual unsigned getTrackLength() = 0;
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	virtual void writeTrackByte(int idx, uint8_t val, bool addIdam = false) = 0;
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	[[nodiscard]] virtual uint8_t readTrackByte(int idx) = 0;
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	virtual EmuTime getNextSector(EmuTime time, RawTrack::Sector& sector) = 0;
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	virtual void flushTrack() = 0;
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	/** Is disk changed?
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	 */
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	virtual bool diskChanged() = 0;           // read and reset
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	[[nodiscard]] virtual bool peekDiskChanged() const = 0; // read without reset
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	/** Is there a dummy (unconnected) drive?
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	 */
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	[[nodiscard]] virtual bool isDummyDrive() const = 0;
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	/** See RawTrack::applyWd2793ReadTrackQuirk() */
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	virtual void applyWd2793ReadTrackQuirk() = 0;
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	virtual void invalidateWd2793ReadTrackQuirk() = 0;
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};
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/**
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 * This class implements a not connected disk drive.
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 */
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class DummyDrive final : public DiskDrive
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{
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public:
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	[[nodiscard]] bool isDiskInserted() const override;
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	[[nodiscard]] bool isWriteProtected() const override;
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	[[nodiscard]] bool isDoubleSided() override;
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	[[nodiscard]] bool isTrack00() const override;
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	void setSide(bool side) override;
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	[[nodiscard]] bool getSide() const override;
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	void step(bool direction, EmuTime time) override;
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	void setMotor(bool status, EmuTime time) override;
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	[[nodiscard]] bool getMotor() const override;
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	[[nodiscard]] bool indexPulse(EmuTime time) override;
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	[[nodiscard]] EmuTime getTimeTillIndexPulse(EmuTime time, int count) override;
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	[[nodiscard]] unsigned getTrackLength() override;
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	void writeTrackByte(int idx, uint8_t val, bool addIdam) override;
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	[[nodiscard]] uint8_t readTrackByte(int idx) override;
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	EmuTime getNextSector(EmuTime time, RawTrack::Sector& sector) override;
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	void flushTrack() override;
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	bool diskChanged() override;
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	[[nodiscard]] bool peekDiskChanged() const override;
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	[[nodiscard]] bool isDummyDrive() const override;
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	void applyWd2793ReadTrackQuirk() override;
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	void invalidateWd2793ReadTrackQuirk() override;
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};
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} // namespace openmsx
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#endif