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/** @file
Set TPM device type
In SecurityPkg, this module initializes the TPM device type based on a UEFI
variable and/or hardware detection. In OvmfPkg, the module only performs TPM2
hardware detection.
Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
Copyright (C) 2018, Red Hat, Inc.
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <PiPei.h>
#include <Guid/TpmInstance.h>
#include <Library/DebugLib.h>
#include <Library/PeiServicesLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Ppi/TpmInitialized.h>
STATIC CONST EFI_PEI_PPI_DESCRIPTOR mTpmSelectedPpi = {
(EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
&gEfiTpmDeviceSelectedGuid,
NULL
};
STATIC CONST EFI_PEI_PPI_DESCRIPTOR mTpmInitializationDonePpiList = {
EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
&gPeiTpmInitializationDonePpiGuid,
NULL
};
/**
The entry point for Tcg2 configuration driver.
@param FileHandle Handle of the file being invoked.
@param PeiServices Describes the list of possible PEI Services.
**/
EFI_STATUS
EFIAPI
Tcg2ConfigPeimEntryPoint (
IN EFI_PEI_FILE_HANDLE FileHandle,
IN CONST EFI_PEI_SERVICES **PeiServices
)
{
UINTN Size;
EFI_STATUS Status;
DEBUG ((DEBUG_INFO, "%a\n", __FUNCTION__));
Status = Tpm2RequestUseTpm ();
if (!EFI_ERROR (Status)) {
DEBUG ((DEBUG_INFO, "%a: TPM2 detected\n", __FUNCTION__));
Size = sizeof (gEfiTpmDeviceInstanceTpm20DtpmGuid);
Status = PcdSetPtrS (
PcdTpmInstanceGuid,
&Size,
&gEfiTpmDeviceInstanceTpm20DtpmGuid
);
ASSERT_EFI_ERROR (Status);
} else {
DEBUG ((DEBUG_INFO, "%a: no TPM2 detected\n", __FUNCTION__));
//
// If no TPM2 was detected, we still need to install
// TpmInitializationDonePpi. Namely, Tcg2Pei will exit early upon seeing
// the default (all-bits-zero) contents of PcdTpmInstanceGuid, thus we have
// to install the PPI in its place, in order to unblock any dependent
// PEIMs.
//
Status = PeiServicesInstallPpi (&mTpmInitializationDonePpiList);
ASSERT_EFI_ERROR (Status);
}
//
// Selection done
//
Status = PeiServicesInstallPpi (&mTpmSelectedPpi);
ASSERT_EFI_ERROR (Status);
return Status;
}
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