initial commit

memory.h

@@ -0,0 +1,37 @@
+#ifndef BEAR_MEMORY_H
+#define BEAR_MEMORY_H
+
+#include <cstddef>
+#include <cstdint>
+
+#include "Bus.h"
+
+class IMemoryAccessor
+{
+public:
+    virtual ~IMemoryAccessor() = default;
+
+    virtual void write(std::uint16_t _addr, std::uint8_t value) = 0;
+    virtual std::uint8_t read8(std::uint16_t _addr) = 0;
+};
+
+class CPUMemoryAccessor : public IMemoryAccessor
+{
+public:
+    explicit CPUMemoryAccessor(Bus* bus);
+    ~CPUMemoryAccessor() override = default;
+
+    void write(std::uint16_t _addr, std::uint8_t value) override;
+    std::uint8_t read8(std::uint16_t _addr) override;
+
+private:
+    std::uint8_t* ram = nullptr;
+    Bus* bus = nullptr;
+
+    static bool isRamAddress(std::uint16_t _addr);
+
+    [[nodiscard]] std::uint8_t readFromRam(std::uint16_t _addr) const;
+    void writeToRam(std::uint16_t _addr, std::uint8_t value) const;
+};
+
+#endif //BEAR_MEMORY_H