Initial commit

src/pse/bus.h

@@ -0,0 +1,72 @@
+#pragma once
+
+#include "YBaseLib/String.h"
+#include "types.h"
+#include <array>
+
+class StateWrapper;
+class DMA;
+class GPU;
+class System;
+
+class Bus
+{
+public:
+  Bus();
+  ~Bus();
+
+  bool Initialize(System* system, DMA* dma, GPU* gpu);
+  void Reset();
+  bool DoState(StateWrapper& sw);
+
+  bool ReadByte(PhysicalMemoryAddress cpu_address, PhysicalMemoryAddress bus_address, u8* value);
+  bool ReadWord(PhysicalMemoryAddress cpu_address, PhysicalMemoryAddress bus_address, u16* value);
+  bool ReadDWord(PhysicalMemoryAddress cpu_address, PhysicalMemoryAddress bus_address, u32* value);
+  bool WriteByte(PhysicalMemoryAddress cpu_address, PhysicalMemoryAddress bus_address, u8 value);
+  bool WriteWord(PhysicalMemoryAddress cpu_address, PhysicalMemoryAddress bus_address, u16 value);
+  bool WriteDWord(PhysicalMemoryAddress cpu_address, PhysicalMemoryAddress bus_address, u32 value);
+
+  template<MemoryAccessType type, MemoryAccessSize size>
+  bool DispatchAccess(PhysicalMemoryAddress cpu_address, PhysicalMemoryAddress bus_address, u32& value);
+
+private:
+  static constexpr u32 DMA_BASE = 0x1F801080;
+  static constexpr u32 DMA_SIZE = 0x80;
+  static constexpr u32 DMA_MASK = DMA_SIZE - 1;
+  static constexpr u32 SPU_BASE = 0x1F801C00;
+  static constexpr u32 SPU_SIZE = 0x300;
+  static constexpr u32 SPU_MASK = 0x3FF;
+  static constexpr u32 EXP2_BASE = 0x1F802000;
+  static constexpr u32 EXP2_SIZE = 0x2000;
+  static constexpr u32 EXP2_MASK = EXP2_SIZE - 1;
+
+  bool LoadBIOS();
+
+  template<MemoryAccessType type, MemoryAccessSize size>
+  bool DoRAMAccess(u32 offset, u32& value);
+
+  template<MemoryAccessType type, MemoryAccessSize size>
+  bool DoBIOSAccess(u32 offset, u32& value);
+
+  bool DoInvalidAccess(MemoryAccessType type, MemoryAccessSize size, PhysicalMemoryAddress cpu_address,
+                       PhysicalMemoryAddress bus_address, u32& value);
+
+  bool ReadExpansionRegion2(MemoryAccessSize size, u32 offset, u32& value);
+  bool WriteExpansionRegion2(MemoryAccessSize size, u32 offset, u32 value);
+
+  bool ReadSPU(MemoryAccessSize size, u32 offset, u32& value);
+  bool WriteSPU(MemoryAccessSize size, u32 offset, u32 value);
+
+  bool DoReadDMA(MemoryAccessSize size, u32 offset, u32& value);
+  bool DoWriteDMA(MemoryAccessSize size, u32 offset, u32& value);
+
+  DMA* m_dma = nullptr;
+  GPU* m_gpu = nullptr;
+
+  std::array<u8, 2097152> m_ram{}; // 2MB RAM
+  std::array<u8, 524288> m_bios{}; // 512K BIOS ROM
+
+  String m_tty_line_buffer;
+};
+
+#include "bus.inl"