OvmfPkg/Tcg/Tcg2Config/Tcg2ConfigPeim.c

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