2 TPM1.2/dTPM2.0 auto detection.
4 Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
11 #include <Ppi/ReadOnlyVariable2.h>
13 #include <Library/BaseLib.h>
14 #include <Library/BaseMemoryLib.h>
15 #include <Library/DebugLib.h>
16 #include <Library/PeiServicesLib.h>
17 #include <Library/PcdLib.h>
18 #include <Library/Tpm12DeviceLib.h>
19 #include <Library/Tpm12CommandLib.h>
20 #include <IndustryStandard/Tpm12.h>
22 #include "Tcg2ConfigNvData.h"
25 This routine check both SetupVariable and real TPM device, and return final TpmDevice configuration.
27 @param SetupTpmDevice TpmDevice configuration in setup driver
29 @return TpmDevice configuration
33 IN UINT8 SetupTpmDevice
37 EFI_BOOT_MODE BootMode
;
38 TCG2_DEVICE_DETECTION Tcg2DeviceDetection
;
39 EFI_PEI_READ_ONLY_VARIABLE2_PPI
*VariablePpi
;
42 Status
= PeiServicesGetBootMode (&BootMode
);
43 ASSERT_EFI_ERROR (Status
);
46 // In S3, we rely on normal boot Detection, because we save to ReadOnly Variable in normal boot.
48 if (BootMode
== BOOT_ON_S3_RESUME
) {
49 DEBUG ((EFI_D_INFO
, "DetectTpmDevice: S3 mode\n"));
51 Status
= PeiServicesLocatePpi (&gEfiPeiReadOnlyVariable2PpiGuid
, 0, NULL
, (VOID
**) &VariablePpi
);
52 ASSERT_EFI_ERROR (Status
);
54 Size
= sizeof(TCG2_DEVICE_DETECTION
);
55 ZeroMem (&Tcg2DeviceDetection
, sizeof(Tcg2DeviceDetection
));
56 Status
= VariablePpi
->GetVariable (
58 TCG2_DEVICE_DETECTION_NAME
,
59 &gTcg2ConfigFormSetGuid
,
64 if (!EFI_ERROR (Status
) &&
65 (Tcg2DeviceDetection
.TpmDeviceDetected
>= TPM_DEVICE_MIN
) &&
66 (Tcg2DeviceDetection
.TpmDeviceDetected
<= TPM_DEVICE_MAX
)) {
67 DEBUG ((EFI_D_ERROR
, "TpmDevice from DeviceDetection: %x\n", Tcg2DeviceDetection
.TpmDeviceDetected
));
68 return Tcg2DeviceDetection
.TpmDeviceDetected
;
72 DEBUG ((EFI_D_INFO
, "DetectTpmDevice:\n"));
74 // dTPM available and not disabled by setup
75 // We need check if it is TPM1.2 or TPM2.0
76 // So try TPM1.2 command at first
78 Status
= Tpm12RequestUseTpm ();
79 if (EFI_ERROR (Status
)) {
83 return TPM_DEVICE_NULL
;
86 if (BootMode
== BOOT_ON_S3_RESUME
) {
87 Status
= Tpm12Startup (TPM_ST_STATE
);
89 Status
= Tpm12Startup (TPM_ST_CLEAR
);
91 if (EFI_ERROR (Status
)) {
92 return TPM_DEVICE_2_0_DTPM
;
95 // NO initialization needed again.
96 Status
= PcdSet8S (PcdTpmInitializationPolicy
, 0);
97 ASSERT_EFI_ERROR (Status
);
98 return TPM_DEVICE_1_2
;