SecurityPkg/Tcg/Tcg2PlatformDxe/Tcg2PlatformDxe.c

   1 /** @file
   2   Platform specific TPM2 component for configuring the Platform Hierarchy.
   3
   4   Copyright (c) 2017 - 2019, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <PiDxe.h>
  10
  11 #include <Library/DebugLib.h>
  12 #include <Library/UefiBootServicesTableLib.h>
  13 #include <Library/UefiLib.h>
  14 #include <Library/TpmPlatformHierarchyLib.h>
  15 #include <Protocol/DxeSmmReadyToLock.h>
  16
  17 /**
  18    This callback function will run at the SmmReadyToLock event.
  19
  20    Configuration of the TPM's Platform Hierarchy Authorization Value (platformAuth)
  21    and Platform Hierarchy Authorization Policy (platformPolicy) can be defined through this function.
  22
  23   @param  Event   Pointer to this event
  24   @param  Context Event hanlder private data
  25  **/
  26 VOID
  27 EFIAPI
  28 SmmReadyToLockEventCallBack (
  29   IN EFI_EVENT  Event,
  30   IN VOID       *Context
  31   )
  32 {
  33   EFI_STATUS   Status;
  34   VOID         *Interface;
  35
  36   //
  37   // Try to locate it because EfiCreateProtocolNotifyEvent will trigger it once when registration.
  38   // Just return if it is not found.
  39   //
  40   Status = gBS->LocateProtocol (
  41                   &gEfiDxeSmmReadyToLockProtocolGuid,
  42                   NULL,
  43                   &Interface
  44                   );
  45   if (EFI_ERROR (Status)) {
  46     return ;
  47   }
  48
  49   ConfigureTpmPlatformHierarchy ();
  50
  51   gBS->CloseEvent (Event);
  52 }
  53
  54 /**
  55    The driver's entry point. Will register a function for callback during SmmReadyToLock event to
  56    configure the TPM's platform authorization.
  57
  58    @param[in] ImageHandle  The firmware allocated handle for the EFI image.
  59    @param[in] SystemTable  A pointer to the EFI System Table.
  60
  61    @retval EFI_SUCCESS     The entry point is executed successfully.
  62    @retval other           Some error occurs when executing this entry point.
  63 **/
  64 EFI_STATUS
  65 EFIAPI
  66 Tcg2PlatformDxeEntryPoint (
  67   IN    EFI_HANDLE                  ImageHandle,
  68   IN    EFI_SYSTEM_TABLE            *SystemTable
  69   )
  70 {
  71   VOID       *Registration;
  72   EFI_EVENT  Event;
  73
  74   Event = EfiCreateProtocolNotifyEvent (
  75             &gEfiDxeSmmReadyToLockProtocolGuid,
  76             TPL_CALLBACK,
  77             SmmReadyToLockEventCallBack,
  78             NULL,
  79             &Registration
  80             );
  81
  82   ASSERT (Event != NULL);
  83
  84   return EFI_SUCCESS;
  85 }