mirror of https://github.com/bsnes-emu/bsnes.git
112 lines
2.5 KiB
C++
112 lines
2.5 KiB
C++
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struct Memory {
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virtual inline unsigned size() const;
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virtual uint8 read(unsigned addr) = 0;
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virtual void write(unsigned addr, uint8 data) = 0;
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};
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struct MMIO {
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virtual uint8 mmio_read(unsigned addr) = 0;
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virtual void mmio_write(unsigned addr, uint8 data) = 0;
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};
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struct UnmappedMemory : Memory {
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unsigned size() const;
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uint8 read(unsigned);
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void write(unsigned, uint8);
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};
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struct UnmappedMMIO : MMIO {
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uint8 mmio_read(unsigned);
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void mmio_write(unsigned, uint8);
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};
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struct StaticRAM : Memory {
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inline uint8* data();
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inline unsigned size() const;
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inline uint8 read(unsigned addr);
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inline void write(unsigned addr, uint8 n);
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inline uint8& operator[](unsigned addr);
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inline const uint8& operator[](unsigned addr) const;
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inline StaticRAM(unsigned size);
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inline ~StaticRAM();
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private:
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uint8 *data_;
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unsigned size_;
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};
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struct MappedRAM : Memory {
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inline void reset();
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inline void map(uint8*, unsigned);
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inline void copy(const uint8*, unsigned);
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inline void write_protect(bool status);
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inline uint8* data();
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inline unsigned size() const;
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inline uint8 read(unsigned addr);
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inline void write(unsigned addr, uint8 n);
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inline const uint8& operator[](unsigned addr) const;
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inline MappedRAM();
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private:
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uint8 *data_;
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unsigned size_;
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bool write_protect_;
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};
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struct MMIOAccess : Memory {
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void map(unsigned addr, MMIO &access);
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uint8 read(unsigned addr);
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void write(unsigned addr, uint8 data);
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MMIO *mmio[0x4000];
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};
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struct Bus {
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unsigned mirror(unsigned addr, unsigned size);
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void map(unsigned addr, Memory &access, unsigned offset);
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enum class MapMode : unsigned { Direct, Linear, Shadow };
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void map(MapMode mode,
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uint8 bank_lo, uint8 bank_hi,
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uint16 addr_lo, uint16 addr_hi,
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Memory &access, unsigned offset = 0, unsigned size = 0);
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alwaysinline uint8 read(unsigned addr);
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alwaysinline void write(unsigned addr, uint8 data);
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bool load_cart();
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void unload_cart();
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void power();
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void reset();
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struct Page {
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Memory *access;
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unsigned offset;
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} page[65536];
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void serialize(serializer&);
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private:
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void map_reset();
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void map_xml();
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void map_system();
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};
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namespace memory {
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extern MMIOAccess mmio; //S-CPU, S-PPU
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extern StaticRAM wram; //S-CPU
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extern StaticRAM apuram; //S-SMP, S-DSP
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extern StaticRAM vram; //S-PPU
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extern StaticRAM oam; //S-PPU
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extern StaticRAM cgram; //S-PPU
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extern UnmappedMemory memory_unmapped;
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extern UnmappedMMIO mmio_unmapped;
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};
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extern Bus bus;
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