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 TPM
   6   hardware detection.
   7
   8   Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
   9   Copyright (C) 2018, Red Hat, Inc.
  10
  11   SPDX-License-Identifier: BSD-2-Clause-Patent
  12 **/
  13
  14 #include <PiPei.h>
  15
  16 #include <Guid/TpmInstance.h>
  17 #include <Library/DebugLib.h>
  18 #include <Library/PeiServicesLib.h>
  19 #include <Library/Tpm2DeviceLib.h>
  20 #include <Ppi/TpmInitialized.h>
  21
  22 #include "Tpm12Support.h"
  23
  24 STATIC CONST EFI_PEI_PPI_DESCRIPTOR  mTpmSelectedPpi = {
  25   (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  26   &gEfiTpmDeviceSelectedGuid,
  27   NULL
  28 };
  29
  30 STATIC CONST EFI_PEI_PPI_DESCRIPTOR  mTpmInitializationDonePpiList = {
  31   EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
  32   &gPeiTpmInitializationDonePpiGuid,
  33   NULL
  34 };
  35
  36 /**
  37   The entry point for Tcg2 configuration driver.
  38
  39   @param  FileHandle  Handle of the file being invoked.
  40   @param  PeiServices Describes the list of possible PEI Services.
  41 **/
  42 EFI_STATUS
  43 EFIAPI
  44 Tcg2ConfigPeimEntryPoint (
  45   IN       EFI_PEI_FILE_HANDLE  FileHandle,
  46   IN CONST EFI_PEI_SERVICES     **PeiServices
  47   )
  48 {
  49   UINTN       Size;
  50   EFI_STATUS  Status;
  51
  52   DEBUG ((DEBUG_INFO, "%a\n", __FUNCTION__));
  53
  54   Status = InternalTpm12Detect ();
  55   if (!EFI_ERROR (Status)) {
  56     DEBUG ((DEBUG_INFO, "%a: TPM1.2 detected\n", __FUNCTION__));
  57     Size   = sizeof (gEfiTpmDeviceInstanceTpm12Guid);
  58     Status = PcdSetPtrS (
  59                PcdTpmInstanceGuid,
  60                &Size,
  61                &gEfiTpmDeviceInstanceTpm12Guid
  62                );
  63     ASSERT_EFI_ERROR (Status);
  64   } else {
  65     Status = Tpm2RequestUseTpm ();
  66     if (!EFI_ERROR (Status)) {
  67       DEBUG ((DEBUG_INFO, "%a: TPM2 detected\n", __FUNCTION__));
  68       Size   = sizeof (gEfiTpmDeviceInstanceTpm20DtpmGuid);
  69       Status = PcdSetPtrS (
  70                  PcdTpmInstanceGuid,
  71                  &Size,
  72                  &gEfiTpmDeviceInstanceTpm20DtpmGuid
  73                  );
  74       ASSERT_EFI_ERROR (Status);
  75     } else {
  76       DEBUG ((DEBUG_INFO, "%a: no TPM detected\n", __FUNCTION__));
  77       //
  78       // If no TPM2 was detected, we still need to install
  79       // TpmInitializationDonePpi. Namely, Tcg2Pei will exit early upon seeing
  80       // the default (all-bits-zero) contents of PcdTpmInstanceGuid, thus we have
  81       // to install the PPI in its place, in order to unblock any dependent
  82       // PEIMs.
  83       //
  84       Status = PeiServicesInstallPpi (&mTpmInitializationDonePpiList);
  85       ASSERT_EFI_ERROR (Status);
  86     }
  87   }
  88
  89   //
  90   // Selection done
  91   //
  92   Status = PeiServicesInstallPpi (&mTpmSelectedPpi);
  93   ASSERT_EFI_ERROR (Status);
  94
  95   return Status;
  96 }