TcgConfigDriver.c

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#include "TcgConfigImpl.h"
#include <Guid/TpmInstance.h>
 
EFI_STATUS
EFIAPI
TcgConfigDriverEntryPoint (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS               Status;
  TCG_CONFIG_PRIVATE_DATA  *PrivateData;
  EFI_TCG_PROTOCOL         *TcgProtocol;
 
  if (!CompareGuid (PcdGetPtr (PcdTpmInstanceGuid), &gEfiTpmDeviceInstanceTpm12Guid)) {
    DEBUG ((DEBUG_ERROR, "No TPM12 instance required!\n"));
    return EFI_UNSUPPORTED;
  }
 
  Status = Tpm12RequestUseTpm ();
  if (EFI_ERROR (Status)) {
    DEBUG ((DEBUG_ERROR, "TPM not detected!\n"));
    return Status;
  }
 
  Status = gBS->LocateProtocol (&gEfiTcgProtocolGuid, NULL, (VOID **)&TcgProtocol);
  if (EFI_ERROR (Status)) {
    TcgProtocol = NULL;
  }
 
  Status = gBS->OpenProtocol (
                  ImageHandle,
                  &gEfiCallerIdGuid,
                  NULL,
                  ImageHandle,
                  ImageHandle,
                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
                  );
  if (!EFI_ERROR (Status)) {
    return EFI_ALREADY_STARTED;
  }
 
  //
  // Create a private data structure.
  //
  PrivateData = AllocateCopyPool (sizeof (TCG_CONFIG_PRIVATE_DATA), &mTcgConfigPrivateDateTemplate);
  if (PrivateData == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }
 
  PrivateData->Configuration = AllocatePool (sizeof (TCG_CONFIGURATION));
  if (PrivateData->Configuration == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto ErrorExit;
  }
 
  PrivateData->TcgProtocol = TcgProtocol;
 
  //
  // Install TCG configuration form
  //
  Status = InstallTcgConfigForm (PrivateData);
  if (EFI_ERROR (Status)) {
    goto ErrorExit;
  }
 
  //
  // Install private GUID.
  //
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &ImageHandle,
                  &gEfiCallerIdGuid,
                  PrivateData,
                  NULL
                  );
 
  if (EFI_ERROR (Status)) {
    goto ErrorExit;
  }
 
  return EFI_SUCCESS;
 
ErrorExit:
  if (PrivateData != NULL) {
    UninstallTcgConfigForm (PrivateData);
  }
 
  return Status;
}
 
EFI_STATUS
EFIAPI
TcgConfigDriverUnload (
  IN EFI_HANDLE  ImageHandle
  )
{
  EFI_STATUS               Status;
  TCG_CONFIG_PRIVATE_DATA  *PrivateData;
 
  Status = gBS->HandleProtocol (
                  ImageHandle,
                  &gEfiCallerIdGuid,
                  (VOID **)&PrivateData
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }
 
  ASSERT (PrivateData->Signature == TCG_CONFIG_PRIVATE_DATA_SIGNATURE);
 
  gBS->UninstallMultipleProtocolInterfaces (
         ImageHandle,
         &gEfiCallerIdGuid,
         PrivateData,
         NULL
         );
 
  UninstallTcgConfigForm (PrivateData);
 
  return EFI_SUCCESS;
}