1 /** @file
2 TPM1.2/dTPM2.0 auto detection.
3
4 Copyright (c) 2013 - 2015, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15
16 #include <PiPei.h>
17 #include <Ppi/ReadOnlyVariable2.h>
18
19 #include <Library/BaseLib.h>
20 #include <Library/BaseMemoryLib.h>
21 #include <Library/IoLib.h>
22 #include <Library/DebugLib.h>
23 #include <Library/PeiServicesLib.h>
24 #include <Library/PcdLib.h>
25 #include <Library/Tpm12DeviceLib.h>
26 #include <Library/Tpm12CommandLib.h>
27 #include <IndustryStandard/Tpm12.h>
28
29 #include "TrEEConfigNvData.h"
30
31 /**
32 This routine return if dTPM (1.2 or 2.0) present.
33
34 @retval TRUE dTPM present
35 @retval FALSE dTPM not present
36 **/
37 BOOLEAN
IsDtpmPresent(VOID)38 IsDtpmPresent (
39 VOID
40 )
41 {
42 UINT8 RegRead;
43
44 RegRead = MmioRead8 ((UINTN)PcdGet64 (PcdTpmBaseAddress));
45 if (RegRead == 0xFF) {
46 DEBUG ((EFI_D_ERROR, "DetectTpmDevice: Dtpm not present\n"));
47 return FALSE;
48 } else {
49 DEBUG ((EFI_D_INFO, "DetectTpmDevice: Dtpm present\n"));
50 return TRUE;
51 }
52 }
53
54 /**
55 This routine check both SetupVariable and real TPM device, and return final TpmDevice configuration.
56
57 @param SetupTpmDevice TpmDevice configuration in setup driver
58
59 @return TpmDevice configuration
60 **/
61 UINT8
DetectTpmDevice(IN UINT8 SetupTpmDevice)62 DetectTpmDevice (
63 IN UINT8 SetupTpmDevice
64 )
65 {
66 EFI_STATUS Status;
67 EFI_BOOT_MODE BootMode;
68 TREE_DEVICE_DETECTION TrEEDeviceDetection;
69 EFI_PEI_READ_ONLY_VARIABLE2_PPI *VariablePpi;
70 UINTN Size;
71
72 Status = PeiServicesGetBootMode (&BootMode);
73 ASSERT_EFI_ERROR (Status);
74
75 //
76 // In S3, we rely on normal boot Detection, because we save to ReadOnly Variable in normal boot.
77 //
78 if (BootMode == BOOT_ON_S3_RESUME) {
79 DEBUG ((EFI_D_INFO, "DetectTpmDevice: S3 mode\n"));
80
81 Status = PeiServicesLocatePpi (&gEfiPeiReadOnlyVariable2PpiGuid, 0, NULL, (VOID **) &VariablePpi);
82 ASSERT_EFI_ERROR (Status);
83
84 Size = sizeof(TREE_DEVICE_DETECTION);
85 ZeroMem (&TrEEDeviceDetection, sizeof(TrEEDeviceDetection));
86 Status = VariablePpi->GetVariable (
87 VariablePpi,
88 TREE_DEVICE_DETECTION_NAME,
89 &gTrEEConfigFormSetGuid,
90 NULL,
91 &Size,
92 &TrEEDeviceDetection
93 );
94 if (!EFI_ERROR (Status) &&
95 (TrEEDeviceDetection.TpmDeviceDetected >= TPM_DEVICE_MIN) &&
96 (TrEEDeviceDetection.TpmDeviceDetected <= TPM_DEVICE_MAX)) {
97 DEBUG ((EFI_D_ERROR, "TpmDevice from DeviceDetection: %x\n", TrEEDeviceDetection.TpmDeviceDetected));
98 return TrEEDeviceDetection.TpmDeviceDetected;
99 }
100 }
101
102 DEBUG ((EFI_D_INFO, "DetectTpmDevice:\n"));
103 if (!IsDtpmPresent ()) {
104 // dTPM not available
105 return TPM_DEVICE_NULL;
106 }
107
108 // dTPM available and not disabled by setup
109 // We need check if it is TPM1.2 or TPM2.0
110 // So try TPM1.2 command at first
111
112 Status = Tpm12RequestUseTpm ();
113 if (EFI_ERROR (Status)) {
114 return TPM_DEVICE_2_0_DTPM;
115 }
116
117 if (BootMode == BOOT_ON_S3_RESUME) {
118 Status = Tpm12Startup (TPM_ST_STATE);
119 } else {
120 Status = Tpm12Startup (TPM_ST_CLEAR);
121 }
122 if (EFI_ERROR (Status)) {
123 return TPM_DEVICE_2_0_DTPM;
124 }
125
126 // NO initialization needed again.
127 Status = PcdSet8S (PcdTpmInitializationPolicy, 0);
128 ASSERT_EFI_ERROR (Status);
129 return TPM_DEVICE_1_2;
130 }
131