OvmfPkg/Tcg/Tcg2Config/Tcg2ConfigPeim.c

   1 /** @file
   2   Set TPM device type
   3
   4   In SecurityPkg, this module initializes the TPM device type based on a UEFI
   5   variable and/or hardware detection. In OvmfPkg, the module only performs TPM2
   6   hardware detection.
   7
   8   Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
   9   Copyright (C) 2018, Red Hat, Inc.
  10
  11   This program and the accompanying materials are licensed and made available
  12   under the terms and conditions of the BSD License which accompanies this
  13   distribution. The full text of the license may be found at
  14   http://opensource.org/licenses/bsd-license.php
  15
  16   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  17   WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  18 **/
  19
  20
  21 #include <PiPei.h>
  22
  23 #include <Guid/TpmInstance.h>
  24 #include <Library/DebugLib.h>
  25 #include <Library/PeiServicesLib.h>
  26 #include <Library/Tpm2DeviceLib.h>
  27 #include <Ppi/TpmInitialized.h>
  28
  29 STATIC CONST EFI_PEI_PPI_DESCRIPTOR mTpmSelectedPpi = {
  30   (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  31   &gEfiTpmDeviceSelectedGuid,
  32   NULL
  33 };
  34
  35 STATIC CONST EFI_PEI_PPI_DESCRIPTOR  mTpmInitializationDonePpiList = {
  36   EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
  37   &gPeiTpmInitializationDonePpiGuid,
  38   NULL
  39 };
  40
  41 /**
  42   The entry point for Tcg2 configuration driver.
  43
  44   @param  FileHandle  Handle of the file being invoked.
  45   @param  PeiServices Describes the list of possible PEI Services.
  46 **/
  47 EFI_STATUS
  48 EFIAPI
  49 Tcg2ConfigPeimEntryPoint (
  50   IN       EFI_PEI_FILE_HANDLE  FileHandle,
  51   IN CONST EFI_PEI_SERVICES     **PeiServices
  52   )
  53 {
  54   UINTN                           Size;
  55   EFI_STATUS                      Status;
  56
  57   DEBUG ((DEBUG_INFO, "%a\n", __FUNCTION__));
  58
  59   Status = Tpm2RequestUseTpm ();
  60   if (!EFI_ERROR (Status)) {
  61     DEBUG ((DEBUG_INFO, "%a: TPM2 detected\n", __FUNCTION__));
  62     Size = sizeof (gEfiTpmDeviceInstanceTpm20DtpmGuid);
  63     Status = PcdSetPtrS (
  64                PcdTpmInstanceGuid,
  65                &Size,
  66                &gEfiTpmDeviceInstanceTpm20DtpmGuid
  67                );
  68     ASSERT_EFI_ERROR (Status);
  69   } else {
  70     DEBUG ((DEBUG_INFO, "%a: no TPM2 detected\n", __FUNCTION__));
  71     //
  72     // If no TPM2 was detected, we still need to install
  73     // TpmInitializationDonePpi. Namely, Tcg2Pei will exit early upon seeing
  74     // the default (all-bits-zero) contents of PcdTpmInstanceGuid, thus we have
  75     // to install the PPI in its place, in order to unblock any dependent
  76     // PEIMs.
  77     //
  78     Status = PeiServicesInstallPpi (&mTpmInitializationDonePpiList);
  79     ASSERT_EFI_ERROR (Status);
  80   }
  81
  82   //
  83   // Selection done
  84   //
  85   Status = PeiServicesInstallPpi (&mTpmSelectedPpi);
  86   ASSERT_EFI_ERROR (Status);
  87
  88   return Status;
  89 }