OvmfPkg/Tcg2ConfigPei: clean up some lib class dependencies

[mirror_edk2.git] / OvmfPkg / Tcg / Tcg2Config / Tcg2ConfigPeim.c

/** @file\r
  Set TPM device type\r
\r
  In SecurityPkg, this module initializes the TPM device type based on a UEFI\r
  variable and/or hardware detection. In OvmfPkg, the module only performs TPM2\r
  hardware detection.\r
\r
  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>\r
  Copyright (C) 2018, Red Hat, Inc.\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
**/\r
\r
\r
#include <PiPei.h>\r
\r
#include <Guid/TpmInstance.h>\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PeiServicesLib.h>\r
#include <Library/Tpm2DeviceLib.h>\r
#include <Library/Tpm12DeviceLib.h>\r
#include <Ppi/TpmInitialized.h>\r
\r
STATIC CONST EFI_PEI_PPI_DESCRIPTOR mTpmSelectedPpi = {\r
  (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),\r
  &gEfiTpmDeviceSelectedGuid,\r
  NULL\r
};\r
\r
STATIC CONST EFI_PEI_PPI_DESCRIPTOR  mTpmInitializationDonePpiList = {\r
  EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,\r
  &gPeiTpmInitializationDonePpiGuid,\r
  NULL\r
};\r
\r
#pragma pack (1)\r
\r
typedef struct {\r
  TPM_RSP_COMMAND_HDR   Hdr;\r
  TPM_CURRENT_TICKS     CurrentTicks;\r
} TPM_RSP_GET_TICKS;\r
\r
#pragma pack ()\r
\r
/**\r
  Probe for the TPM for 1.2 version, by sending TPM1.2 GetTicks\r
\r
  Sending a TPM1.2 command to a TPM2 should return a TPM1.2\r
  header (tag = 0xc4) and error code (TPM_BADTAG = 0x1e)\r
**/\r
static\r
EFI_STATUS\r
TestTpm12 (\r
  )\r
{\r
  EFI_STATUS           Status;\r
  TPM_RQU_COMMAND_HDR  Command;\r
  TPM_RSP_GET_TICKS    Response;\r
  UINT32               Length;\r
\r
  Command.tag       = SwapBytes16 (TPM_TAG_RQU_COMMAND);\r
  Command.paramSize = SwapBytes32 (sizeof (Command));\r
  Command.ordinal   = SwapBytes32 (TPM_ORD_GetTicks);\r
\r
  Length = sizeof (Response);\r
  Status = Tpm12SubmitCommand (sizeof (Command), (UINT8 *)&Command, &Length, (UINT8 *)&Response);\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  The entry point for Tcg2 configuration driver.\r
\r
  @param  FileHandle  Handle of the file being invoked.\r
  @param  PeiServices Describes the list of possible PEI Services.\r
**/\r
EFI_STATUS\r
EFIAPI\r
Tcg2ConfigPeimEntryPoint (\r
  IN       EFI_PEI_FILE_HANDLE  FileHandle,\r
  IN CONST EFI_PEI_SERVICES     **PeiServices\r
  )\r
{\r
  UINTN                           Size;\r
  EFI_STATUS                      Status;\r
\r
  DEBUG ((DEBUG_INFO, "%a\n", __FUNCTION__));\r
\r
  Status = Tpm12RequestUseTpm ();\r
  if (!EFI_ERROR (Status) && !EFI_ERROR (TestTpm12 ())) {\r
    DEBUG ((DEBUG_INFO, "%a: TPM1.2 detected\n", __FUNCTION__));\r
    Size = sizeof (gEfiTpmDeviceInstanceTpm12Guid);\r
    Status = PcdSetPtrS (\r
               PcdTpmInstanceGuid,\r
               &Size,\r
               &gEfiTpmDeviceInstanceTpm12Guid\r
               );\r
    ASSERT_EFI_ERROR (Status);\r
  } else {\r
    Status = Tpm2RequestUseTpm ();\r
    if (!EFI_ERROR (Status)) {\r
      DEBUG ((DEBUG_INFO, "%a: TPM2 detected\n", __FUNCTION__));\r
      Size = sizeof (gEfiTpmDeviceInstanceTpm20DtpmGuid);\r
      Status = PcdSetPtrS (\r
                 PcdTpmInstanceGuid,\r
                 &Size,\r
                 &gEfiTpmDeviceInstanceTpm20DtpmGuid\r
                 );\r
      ASSERT_EFI_ERROR (Status);\r
    } else {\r
      DEBUG ((DEBUG_INFO, "%a: no TPM detected\n", __FUNCTION__));\r
      //\r
      // If no TPM2 was detected, we still need to install\r
      // TpmInitializationDonePpi. Namely, Tcg2Pei will exit early upon seeing\r
      // the default (all-bits-zero) contents of PcdTpmInstanceGuid, thus we have\r
      // to install the PPI in its place, in order to unblock any dependent\r
      // PEIMs.\r
      //\r
      Status = PeiServicesInstallPpi (&mTpmInitializationDonePpiList);\r
      ASSERT_EFI_ERROR (Status);\r
    }\r
  }\r
\r
  //\r
  // Selection done\r
  //\r
  Status = PeiServicesInstallPpi (&mTpmSelectedPpi);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return Status;\r
}\r