Started work on CPU class

src/hardware/CPU.cpp

@@ -24,8 +24,35 @@ namespace dragon
 {
 	namespace hw
 	{
-		CPU::CPU(void)
+		CPU::CPU(BUS& bus) : m_bus(bus), m_mmu(m_bus, &m_accessMode)
 		{
 		}
+
+		bool CPU::run(void)
+		{
+			while (!m_halted)
+			{
+				try
+				{
+					step(); // fetch + decode + execute one instruction
+				}
+				catch (const GuestException& e)
+				{
+					take_exception(e.cause, e.fault_addr);
+				}
+			}
+			return true;
+		}
+
+		void CPU::take_exception(ExceptionCause cause, VirtualAddress fault_addr)
+		{
+			// m_epc      = m_faulting_pc;          // saved before/during the faulting instr
+			// m_cause    = static_cast<u32>(cause);
+			// m_badaddr  = fault_addr;
+			// m_estatus  = pack_mode_and_ie();     // save mode/IE
+			// set_mode_supervisor();
+			// set_interrupts_enabled(false);
+			// m_pc = m_iv;                         // jump to single entry point
+		}
 	}
 }

src/hardware/CPU.hpp

@@ -20,18 +20,29 @@
 
 #pragma once
 
-// #include "../common/Data.hpp"
+#include "../common/Data.hpp"
+#include "MMU.hpp"
 
 namespace dragon
 {
 	namespace hw
 	{
+		class BUS;
 		class CPU
 		{
 			public:
-				CPU(void);
+				CPU(BUS& bus);
+				bool run(void);
 
 			private:
+				void take_exception(ExceptionCause cause, VirtualAddress fault_addr);
+				void step(void);
+
+			private:
+				bool m_halted { true };
+				MMUAccessMode m_accessMode { MMUAccessMode::Privileged };
+				BUS& m_bus;
+				MMU m_mmu;
 		};
 	}
 }