Function PcdDxeInit

MdeModulePkg/Universal/PCD/Dxe/Pcd.c:119–189

Main entry for PCD DXE driver. This routine initialize the PCD database and install PCD_PROTOCOL. @param ImageHandle Image handle for PCD DXE driver. @param SystemTable Pointer to SystemTable. @return Status of gBS->InstallProtocolInterface() **/

**/
EFI_STATUS
EFIAPI
PcdDxeInit (
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable
  )
{
  EFI_STATUS Status;
  VOID       *Registration;

  //
  // Make sure the Pcd Protocol is not already installed in the system
  //

  ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gPcdProtocolGuid);

  BuildPcdDxeDataBase ();

  //
  // Install PCD_PROTOCOL to handle dynamic type PCD
  // Install EFI_PCD_PROTOCOL to handle dynamicEx type PCD
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &mPcdHandle,
                  &gPcdProtocolGuid,     &mPcdInstance,
                  &gEfiPcdProtocolGuid,  &mEfiPcdInstance,
                  NULL
                  );
  ASSERT_EFI_ERROR(Status);

  //
  // Install GET_PCD_INFO_PROTOCOL to handle dynamic type PCD
  // Install EFI_GET_PCD_INFO_PROTOCOL to handle dynamicEx type PCD
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &mPcdHandle,
                  &gGetPcdInfoProtocolGuid,     &mGetPcdInfoInstance,
                  &gEfiGetPcdInfoProtocolGuid,  &mEfiGetPcdInfoInstance,
                  NULL
                  );
  ASSERT_EFI_ERROR(Status);

  //
  // Register callback function upon VariableLockProtocol
  // to lock the variables referenced by DynamicHii PCDs with RO property set in *.dsc.
  //
  EfiCreateProtocolNotifyEvent (
    &gEdkiiVariableLockProtocolGuid,
    TPL_CALLBACK,
    VariableLockCallBack,
    NULL,
    &Registration
    );

  //
  // Cache VpdBaseAddress in entry point for the following usage.
  //