OvmfPkg/Tcg2ConfigPei: trivial coding style updates

[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
  This program and the accompanying materials are licensed and made available\r
  under the terms and conditions of the BSD License which accompanies this\r
  distribution. The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r
  WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\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
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 = 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 TPM2 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
  // Selection done\r
  //\r
  Status = PeiServicesInstallPpi (&mTpmSelectedPpi);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return Status;\r
}\r