SecurityPkg/Library/PeiTcg2PhysicalPresenceLib/PeiTcg2PhysicalPresenceLib.c

   1 /** @file
   2   Get TPM 2.0 physical presence information.
   3
   4   This library will get TPM 2.0 physical presence information.
   5
   6 Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
   7 SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #include <PiPei.h>
  12
  13 #include <Guid/Tcg2PhysicalPresenceData.h>
  14 #include <Ppi/ReadOnlyVariable2.h>
  15
  16 #include <Library/DebugLib.h>
  17 #include <Library/PeiServicesLib.h>
  18 #include <Library/PeiServicesTablePointerLib.h>
  19 #include <Library/Tcg2PhysicalPresenceLib.h>
  20
  21 /**
  22   Return TPM2 ManagementFlags set by PP interface.
  23
  24   @retval    ManagementFlags    TPM2 Management Flags.
  25 **/
  26 UINT32
  27 EFIAPI
  28 Tcg2PhysicalPresenceLibGetManagementFlags (
  29   VOID
  30   )
  31 {
  32   EFI_STATUS                        Status;
  33   EFI_PEI_READ_ONLY_VARIABLE2_PPI   *VariablePpi;
  34   EFI_TCG2_PHYSICAL_PRESENCE_FLAGS  PpiFlags;
  35   UINTN                             DataSize;
  36
  37   Status = PeiServicesLocatePpi (&gEfiPeiReadOnlyVariable2PpiGuid, 0, NULL, (VOID **) &VariablePpi);
  38   ASSERT_EFI_ERROR (Status);
  39
  40   DataSize = sizeof (EFI_TCG2_PHYSICAL_PRESENCE_FLAGS);
  41   Status = VariablePpi->GetVariable (
  42                           VariablePpi,
  43                           TCG2_PHYSICAL_PRESENCE_FLAGS_VARIABLE,
  44                           &gEfiTcg2PhysicalPresenceGuid,
  45                           NULL,
  46                           &DataSize,
  47                           &PpiFlags
  48                           );
  49   if (EFI_ERROR (Status)) {
  50     PpiFlags.PPFlags = TCG2_BIOS_TPM_MANAGEMENT_FLAG_DEFAULT | TCG2_BIOS_STORAGE_MANAGEMENT_FLAG_DEFAULT;
  51   }
  52   return PpiFlags.PPFlags;
  53 }