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