[Add] software simulator add

labus/include/sysbus.hh

@@ -1 +1,33 @@
-int fetch();
+#pragma once
+
+#include <cstdint>
+#include <cstdlib>
+#include <map>
+
+#include <device.hh>
+
+class SystemBus {
+  std::map<uint64_t, Device *> iomap;
+
+  std::pair<const uint64_t, Device *> &finddev(uint64_t addr);
+
+public:
+  SystemBus() = default;
+
+  void regdev(Device *dev, uint64_t addr);
+
+  void write(char *buf, size_t addr, size_t len);
+  void read(char *buf, size_t addr, size_t len);
+
+  void write64(uint64_t &dword, size_t addr);
+  void read64(uint64_t &dword, size_t addr);
+
+  void write32(uint32_t &word, size_t addr);
+  void read32(uint32_t &word, size_t addr);
+
+  void write16(uint16_t &hword, size_t addr);
+  void read16(uint16_t &hword, size_t addr);
+
+  void write8(uint8_t &byte, size_t addr);
+  void read8(uint8_t &byte, size_t addr);
+};