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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 TPM
hardware detection.
Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
Copyright (C) 2018, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Guid/TpmInstance.h>
#include <Library/DebugLib.h>
#include <Library/PeiServicesLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Ppi/TpmInitialized.h>
#include "Tpm12Support.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 = InternalTpm12Detect ();
if (!EFI_ERROR (Status)) {
DEBUG ((DEBUG_INFO, "%a: TPM1.2 detected\n", __FUNCTION__));
Size = sizeof (gEfiTpmDeviceInstanceTpm12Guid);
Status = PcdSetPtrS (
PcdTpmInstanceGuid,
&Size,
&gEfiTpmDeviceInstanceTpm12Guid
);
ASSERT_EFI_ERROR (Status);
} else {
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 TPM 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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