CDROM: Stub implementation

src/pse/cdrom.h

@@ -0,0 +1,66 @@
+#pragma once
+#include "types.h"
+#include "common/bitfield.h"
+#include "common/fifo_queue.h"
+
+class StateWrapper;
+
+class DMA;
+class InterruptController;
+
+class CDROM
+{
+public:
+  CDROM();
+  ~CDROM();
+
+  bool Initialize(DMA* dma, InterruptController* interrupt_controller);
+  void Reset();
+  bool DoState(StateWrapper& sw);
+
+  // I/O
+  u8 ReadRegister(u32 offset);
+  void WriteRegister(u32 offset, u8 value);
+
+  void Execute();
+
+private:
+  static constexpr u32 PARAM_FIFO_SIZE = 16;
+  static constexpr u32 RESPONSE_FIFO_SIZE = 16;
+  static constexpr u32 DATA_FIFO_SIZE = 4096;
+  static constexpr u32 NUM_INTERRUPTS = 32;
+  static constexpr u8 INTERRUPT_REGISTER_MASK = 0x1F;
+
+  bool HasPendingInterrupt() const { return m_interrupt_flag_register != 0; }
+  void WriteCommand(u8 command);
+
+  DMA* m_dma;
+  InterruptController* m_interrupt_controller;
+
+  enum class State : u32
+  {
+    Idle
+  };
+
+  State m_state = State::Idle;
+
+  union
+  {
+    u8 bits;
+    BitField<u8, u8, 0, 2> index;
+    BitField<u8, bool, 2, 1> ADPBUSY;
+    BitField<u8, bool, 3, 1> PRMEMPTY;
+    BitField<u8, bool, 4, 1> PRMWRDY;
+    BitField<u8, bool, 5, 1> RSLRRDY;
+    BitField<u8, bool, 6, 1> DRQSTS;
+    BitField<u8, bool, 7, 1> BUSYSTS;
+  } m_status = {};
+
+  u8 m_interrupt_enable_register = INTERRUPT_REGISTER_MASK;
+  u8 m_interrupt_flag_register = 0;
+
+  InlineFIFOQueue<u8, PARAM_FIFO_SIZE> m_param_fifo;
+  InlineFIFOQueue<u8, RESPONSE_FIFO_SIZE> m_response_fifo;
+  HeapFIFOQueue<u8, DATA_FIFO_SIZE> m_data_fifo;
+};
+