initial commitHEADmaster

1 files changed, 65 insertions, 0 deletions

diff --git a/src/Bus.h b/src/Bus.h
new file mode 100644
index 0000000..d55ee4f
--- /dev/null
+++ b/src/Bus.h
@@ -0,0 +1,65 @@
+#pragma once
+
+#include <iostream>
+#include <cstdint>
+#include <type_traits>
+#include <stdexcept>
+#include <cstring>
+#include <memory>
+
+#include "RAM.h"
+
+#include "Exceptions.h"
+
+class Bus {
+public:
+  Bus(std::shared_ptr<RAM> m_Bus);
+  ~Bus() = default;
+
+public:
+  template<typename T>
+  void WriteX(uint64_t address, T value)
+  {
+    static_assert(std::is_unsigned_v<T>, "T must be an unsigned int of any size smaller than 8 bytes!");
+
+    // std::cout << "Bus write: " << std::hex << address << std::endl;
+    
+    switch(address)
+    {
+    case 0x00008000 ... 0x000FFFFF:
+    {
+      uint64_t offset = address - 0x00008000;
+      std::memcpy(&m_RAM->Data()[offset], &value, sizeof(T));
+      break;
+    }
+    default:
+      std::string exception = "Illegal access to: " + std::to_string(address);
+      throw CPUException(exception);
+    }
+  }
+
+  template<typename T>
+  T AccessX(uint64_t address)
+  {
+    static_assert(std::is_unsigned_v<T>, "T must be an unsigned int of any size smaller than 8 bytes!");
+
+    //std::cout << "Bus access: " << std::hex << address << std::endl;
+
+    switch(address)
+    {
+    case 0x00008000 ... 0x000FFFFF:
+    {
+      uint64_t offset = address - 0x00008000;
+      T value;
+      std::memcpy(&value, &m_RAM->Data()[offset], sizeof(T));
+      return value;
+    }
+    default:
+      std::string exception = "Illegal access to: " +  std::to_string(address);
+      throw std::runtime_error(exception);
+    }
+  }
+  
+private:
+  std::shared_ptr<RAM> m_RAM;
+};