[idd] implement CIVSHMEM and open it

idd/LGIdd/CIVSHMEM.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <Windows.h>
+#include <SetupAPI.h>
+#include <vector>
+
+class CIVSHMEM
+{
+private:
+  struct IVSHMEMData
+  {
+    SP_DEVINFO_DATA devInfoData;
+    DWORD64         busAddr;
+  };
+
+  std::vector<struct IVSHMEMData> m_devices;
+  HANDLE m_handle = INVALID_HANDLE_VALUE;
+  size_t m_size;
+  void * m_mem = nullptr;
+
+public:
+  CIVSHMEM();
+  ~CIVSHMEM();
+
+  bool Init();
+  bool Open();
+  void Close();
+};
+