SecurityPkg/Tcg/TrEEConfig/TpmDetection.c

   1 /** @file
   2   TPM1.2/dTPM2.0 auto detection.
   3
   4 Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>
   5 This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15
  16 #include <PiPei.h>
  17
  18 #include <Library/BaseLib.h>
  19 #include <Library/BaseMemoryLib.h>
  20 #include <Library/IoLib.h>
  21 #include <Library/DebugLib.h>
  22 #include <Library/PeiServicesLib.h>
  23 #include <Library/PcdLib.h>
  24 #include <Library/Tpm12DeviceLib.h>
  25 #include <Library/Tpm12CommandLib.h>
  26 #include <IndustryStandard/Tpm12.h>
  27
  28 #include "TrEEConfigNvData.h"
  29
  30 /**
  31   This routine return if dTPM (1.2 or 2.0) present.
  32
  33   @retval TRUE  dTPM present
  34   @retval FALSE dTPM not present
  35 **/
  36 BOOLEAN
  37 IsDtpmPresent (
  38   VOID
  39   )
  40 {
  41   UINT8                             RegRead;
  42
  43   RegRead = MmioRead8 ((UINTN)PcdGet64 (PcdTpmBaseAddress));
  44   if (RegRead == 0xFF) {
  45     DEBUG ((EFI_D_ERROR, "DetectTpmDevice: Dtpm not present\n"));
  46     return FALSE;
  47   } else {
  48     DEBUG ((EFI_D_ERROR, "DetectTpmDevice: Dtpm present\n"));
  49     return TRUE;
  50   }
  51 }
  52
  53 /**
  54   This routine check both SetupVariable and real TPM device, and return final TpmDevice configuration.
  55
  56   @param  SetupTpmDevice  TpmDevice configuration in setup driver
  57
  58   @return TpmDevice configuration
  59 **/
  60 UINT8
  61 DetectTpmDevice (
  62   IN UINT8 SetupTpmDevice
  63   )
  64 {
  65   EFI_STATUS                        Status;
  66   EFI_BOOT_MODE                     BootMode;
  67
  68   Status = PeiServicesGetBootMode (&BootMode);
  69   ASSERT_EFI_ERROR (Status);
  70
  71   //
  72   // In S3, we rely on Setup option, because we save to Setup in normal boot.
  73   //
  74   if (BootMode == BOOT_ON_S3_RESUME) {
  75     DEBUG ((EFI_D_ERROR, "DetectTpmDevice: S3 mode\n"));
  76     return SetupTpmDevice;
  77   }
  78
  79   if (PcdGetBool (PcdHideTpmSupport) && PcdGetBool (PcdHideTpm)) {
  80     DEBUG ((EFI_D_ERROR, "DetectTpmDevice: Tpm is hide\n"));
  81     return TPM_DEVICE_NULL;
  82   }
  83
  84   DEBUG ((EFI_D_ERROR, "DetectTpmDevice:\n"));
  85   if ((!IsDtpmPresent ()) || (SetupTpmDevice == TPM_DEVICE_NULL)) {
  86     // dTPM not available
  87     return TPM_DEVICE_NULL;
  88   }
  89
  90   // dTPM available and not disabled by setup
  91   // We need check if it is TPM1.2 or TPM2.0
  92   // So try TPM1.2 command at first
  93
  94   Status = Tpm12RequestUseTpm ();
  95   if (EFI_ERROR (Status)) {
  96     return TPM_DEVICE_2_0_DTPM;
  97   }
  98
  99   Status = Tpm12Startup (TPM_ST_CLEAR);
 100   if (EFI_ERROR (Status)) {
 101     return TPM_DEVICE_2_0_DTPM;
 102   }
 103
 104   // NO initialization needed again.
 105   PcdSet8 (PcdTpmInitializationPolicy, 0);
 106   return TPM_DEVICE_1_2;
 107 }