OvmfPkg/Tcg2ConfigPei: factor out InternalTpm12Detect()

[mirror_edk2.git] / OvmfPkg / Tcg / Tcg2Config / Tcg2ConfigPeim.c

/** @file\r
  Set TPM device type\r
\r
  In SecurityPkg, this module initializes the TPM device type based on a UEFI\r
  variable and/or hardware detection. In OvmfPkg, the module only performs TPM2\r
  hardware detection.\r
\r
  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r
  Copyright (C) 2018, Red Hat, Inc.\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
**/\r
\r
\r
#include <PiPei.h>\r
\r
#include <Guid/TpmInstance.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PeiServicesLib.h>\r
#include <Library/Tpm2DeviceLib.h>\r
#include <Ppi/TpmInitialized.h>\r
\r
#include "Tpm12Support.h"\r
\r
STATIC CONST EFI_PEI_PPI_DESCRIPTOR mTpmSelectedPpi = {\r
  (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),\r
  &gEfiTpmDeviceSelectedGuid,\r
  NULL\r
};\r
\r
STATIC CONST EFI_PEI_PPI_DESCRIPTOR  mTpmInitializationDonePpiList = {\r
  EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,\r
  &gPeiTpmInitializationDonePpiGuid,\r
  NULL\r
};\r
\r
/**\r
  The entry point for Tcg2 configuration driver.\r
\r
  @param  FileHandle  Handle of the file being invoked.\r
  @param  PeiServices Describes the list of possible PEI Services.\r
**/\r
EFI_STATUS\r
EFIAPI\r
Tcg2ConfigPeimEntryPoint (\r
  IN       EFI_PEI_FILE_HANDLE  FileHandle,\r
  IN CONST EFI_PEI_SERVICES     **PeiServices\r
  )\r
{\r
  UINTN                           Size;\r
  EFI_STATUS                      Status;\r
\r
  DEBUG ((DEBUG_INFO, "%a\n", __FUNCTION__));\r
\r
  Status = InternalTpm12Detect ();\r
  if (!EFI_ERROR (Status)) {\r
    DEBUG ((DEBUG_INFO, "%a: TPM1.2 detected\n", __FUNCTION__));\r
    Size = sizeof (gEfiTpmDeviceInstanceTpm12Guid);\r
    Status = PcdSetPtrS (\r
               PcdTpmInstanceGuid,\r
               &Size,\r
               &gEfiTpmDeviceInstanceTpm12Guid\r
               );\r
    ASSERT_EFI_ERROR (Status);\r
  } else {\r
    Status = Tpm2RequestUseTpm ();\r
    if (!EFI_ERROR (Status)) {\r
      DEBUG ((DEBUG_INFO, "%a: TPM2 detected\n", __FUNCTION__));\r
      Size = sizeof (gEfiTpmDeviceInstanceTpm20DtpmGuid);\r
      Status = PcdSetPtrS (\r
                 PcdTpmInstanceGuid,\r
                 &Size,\r
                 &gEfiTpmDeviceInstanceTpm20DtpmGuid\r
                 );\r
      ASSERT_EFI_ERROR (Status);\r
    } else {\r
      DEBUG ((DEBUG_INFO, "%a: no TPM detected\n", __FUNCTION__));\r
      //\r
      // If no TPM2 was detected, we still need to install\r
      // TpmInitializationDonePpi. Namely, Tcg2Pei will exit early upon seeing\r
      // the default (all-bits-zero) contents of PcdTpmInstanceGuid, thus we have\r
      // to install the PPI in its place, in order to unblock any dependent\r
      // PEIMs.\r
      //\r
      Status = PeiServicesInstallPpi (&mTpmInitializationDonePpiList);\r
      ASSERT_EFI_ERROR (Status);\r
    }\r
  }\r
\r
  //\r
  // Selection done\r
  //\r
  Status = PeiServicesInstallPpi (&mTpmSelectedPpi);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return Status;\r
}\r