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/** @file
TPM1.2/dTPM2.0 auto detection.
Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Ppi/ReadOnlyVariable2.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/PeiServicesLib.h>
#include <Library/PcdLib.h>
#include <Library/Tpm12DeviceLib.h>
#include <Library/Tpm12CommandLib.h>
#include <IndustryStandard/Tpm12.h>
#include "Tcg2ConfigNvData.h"
/**
This routine check both SetupVariable and real TPM device, and return final TpmDevice configuration.
@param SetupTpmDevice TpmDevice configuration in setup driver
@return TpmDevice configuration
**/
UINT8
DetectTpmDevice (
IN UINT8 SetupTpmDevice
)
{
EFI_STATUS Status;
EFI_BOOT_MODE BootMode;
TCG2_DEVICE_DETECTION Tcg2DeviceDetection;
EFI_PEI_READ_ONLY_VARIABLE2_PPI *VariablePpi;
UINTN Size;
Status = PeiServicesGetBootMode (&BootMode);
ASSERT_EFI_ERROR (Status);
//
// In S3, we rely on normal boot Detection, because we save to ReadOnly Variable in normal boot.
//
if (BootMode == BOOT_ON_S3_RESUME) {
DEBUG ((EFI_D_INFO, "DetectTpmDevice: S3 mode\n"));
Status = PeiServicesLocatePpi (&gEfiPeiReadOnlyVariable2PpiGuid, 0, NULL, (VOID **) &VariablePpi);
ASSERT_EFI_ERROR (Status);
Size = sizeof(TCG2_DEVICE_DETECTION);
ZeroMem (&Tcg2DeviceDetection, sizeof(Tcg2DeviceDetection));
Status = VariablePpi->GetVariable (
VariablePpi,
TCG2_DEVICE_DETECTION_NAME,
&gTcg2ConfigFormSetGuid,
NULL,
&Size,
&Tcg2DeviceDetection
);
if (!EFI_ERROR (Status) &&
(Tcg2DeviceDetection.TpmDeviceDetected >= TPM_DEVICE_MIN) &&
(Tcg2DeviceDetection.TpmDeviceDetected <= TPM_DEVICE_MAX)) {
DEBUG ((EFI_D_ERROR, "TpmDevice from DeviceDetection: %x\n", Tcg2DeviceDetection.TpmDeviceDetected));
return Tcg2DeviceDetection.TpmDeviceDetected;
}
}
DEBUG ((EFI_D_INFO, "DetectTpmDevice:\n"));
// dTPM available and not disabled by setup
// We need check if it is TPM1.2 or TPM2.0
// So try TPM1.2 command at first
Status = Tpm12RequestUseTpm ();
if (EFI_ERROR (Status)) {
//
// dTPM not available
//
return TPM_DEVICE_NULL;
}
if (BootMode == BOOT_ON_S3_RESUME) {
Status = Tpm12Startup (TPM_ST_STATE);
} else {
Status = Tpm12Startup (TPM_ST_CLEAR);
}
if (EFI_ERROR (Status)) {
return TPM_DEVICE_2_0_DTPM;
}
// NO initialization needed again.
Status = PcdSet8S (PcdTpmInitializationPolicy, 0);
ASSERT_EFI_ERROR (Status);
return TPM_DEVICE_1_2;
}
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