type
  TtagPhysStruct = packed record
    dwPhysMemSizeInBytes : Int64; //Number of bytes to map
    pvPhysAddress : Int64;        //Physical address to be mapped
    PhysicalMemoryHandle : Int64; //Handle to a section returned by ZwOpenSection
    pvPhysMemLin : Int64;         //Pointer to a variable that receives the base address of the view
    pvPhysSection : Int64;
  end;

function MapPhysToLin(var PhysStruct: TtagPhysStruct) : Int64;
var
  dwBytesReturned : DWORD;
begin
  if not DeviceIoControl(hDriver,
                         IOCTL_WINIO_MAPPHYSTOLIN, //IOCTL 0x810
                         @PhysStruct,
                         SizeOf(TtagPhysStruct),
                         @PhysStruct,
                         SizeOf(TtagPhysStruct),
		         dwBytesReturned,nil)
    then Result:=0
      else Result:=PhysStruct.pvPhysMemLin;

var
  dllGetPhysLong: function (pbPhysAddr: PByte; out pdwPhysVal: PDWORD): Boolean; stdcall;
  dllInitializeWinIo: function : Boolean; stdcall;

procedure TForm1.Button2Click(Sender: TObject);
var
  hLibrary: THandle;
  hBuffer : PDWORD;
begin
  hBuffer:=0;
  hLibrary:=LoadLibrary('WinIo32.dll');
  if hLibrary > HINSTANCE_ERROR then
  begin
    @dllInitializeWinIo:=GetProcAddress(hLibrary, 'InitializeWinIo');
    @dllGetPhysLong:=GetProcAddress(hLibrary, 'GetPhysLong');
    if @dllInitializeWinIo <> nil then
      if dllInitializeWinIo then
        if @dllGetPhysLong <> nil then
        begin
          if dllGetPhysLong(Ptr($C0000),hBuffer) then
            ShowMessage(IntToHex(DWORD(hBuffer),8))
            else ShowMessage('Error '+IntToHex(GetLastError,8));;
        end;
    FreeLibrary(hLibrary);
  end;
end;

#pragma pack(push)
#pragma pack(1)

struct tagPhysStruct
{
	DWORD64 dwPhysMemSizeInBytes;
	DWORD64 pvPhysAddress;
	DWORD64 PhysicalMemoryHandle;
	DWORD64 pvPhysMemLin;
	DWORD64 pvPhysSection;
};

#pragma pack(pop)

#endif