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63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
//
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// Created by anonymus-raccoon on 1/23/20.
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//
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#ifndef COMSQUARE_MEMORYBUS_HPP
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#define COMSQUARE_MEMORYBUS_HPP
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#include <cstdint>
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#include <vector>
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#include <memory>
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#include "IMemory.hpp"
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namespace ComSquare
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{
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class SNES;
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namespace Memory
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{
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//! @brief The memory bus is the component responsible of mapping addresses to components address and transmitting the data.
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class MemoryBus {
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private:
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//! @brief The list of components registered inside the bus. Every components that can read/write to a public address should be in this vector.
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std::vector<std::shared_ptr<IMemory>> _memoryAccessors;
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//! @brief The last value read via the memory bus.
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uint8_t _openBus = 0;
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//! @brief WRam, CPU, PPU & APU registers are mirrored to all banks of Q1 & Q3. This function is used for the mirroring.
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//! @param console All the components.
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//! @param i Base address for the mirrors.
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void _mirrorComponents(SNES &console, unsigned i);
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public:
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MemoryBus() = default;
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MemoryBus(const MemoryBus &) = default;
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MemoryBus &operator=(const MemoryBus &) = default;
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~MemoryBus() = default;
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//! @brief Read data at a global address.
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//! @param addr The address to read from.
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//! @return The value that the component returned for this address. If the address was mapped to ram, it simply returned the value. If the address was mapped to a register the component returned the register.
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uint8_t read(uint24_t addr);
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//! @brief Write a data to a global address.
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//! @param addr The address to write to.
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//! @param data The data to write.
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void write(uint24_t addr, uint8_t data);
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//! @brief Map components to the address space using the currently loaded cartridge to set the right mapping mode.
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//! @param console All the components.
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void mapComponents(SNES &console);
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//! @brief Helper function to get the components that is responsible of read/write at an address.
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//! @param addr The address you want to look for.
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//! @return The components responsible for the address param or nullptr if none was found.
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std::shared_ptr<IMemory> getAccessor(uint24_t addr);
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};
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}
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}
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#endif //COMSQUARE_MEMORYBUS_HPP
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