1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
|
/** @file
TIS (TPM Interface Specification) functions used by TPM PEI driver.
Copyright (c) 2005 - 2011, Intel Corporation. All rights reserved.<BR>
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 <IndustryStandard/Tpm12.h>
#include <IndustryStandard/UefiTcgPlatform.h>
#include <Library/TpmCommLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseLib.h>
#include <Library/IoLib.h>
#include <Library/BaseMemoryLib.h>
/**
Send a command to TPM for execution and return response data.
@param[in] PeiServices Describes the list of possible PEI Services.
@param[in] TisReg TPM register space base address.
@param[in] BufferIn Buffer for command data.
@param[in] SizeIn Size of command data.
@param[in, out] BufferOut Buffer for response data.
@param[in, out] SizeOut Size of response data.
@retval EFI_SUCCESS Operation completed successfully.
@retval EFI_TIMEOUT The register can't run into the expected status in time.
@retval EFI_BUFFER_TOO_SMALL Response data buffer is too small.
@retval EFI_DEVICE_ERROR Unexpected device behavior.
**/
EFI_STATUS
TisTpmCommand (
IN EFI_PEI_SERVICES **PeiServices,
IN TIS_PC_REGISTERS_PTR TisReg,
IN UINT8 *BufferIn,
IN UINT32 SizeIn,
IN OUT UINT8 *BufferOut,
IN OUT UINT32 *SizeOut
)
{
EFI_STATUS Status;
UINT16 BurstCount;
UINT32 Index;
UINT32 TpmOutSize;
UINT16 Data16;
UINT32 Data32;
Status = TisPcPrepareCommand (TisReg);
if (EFI_ERROR (Status)){
DEBUG ((DEBUG_ERROR, "Tpm is not ready for command!\n"));
return Status;
}
//
// Send the command data to Tpm
//
Index = 0;
while (Index < SizeIn) {
Status = TisPcReadBurstCount (TisReg, &BurstCount);
if (EFI_ERROR (Status)) {
Status = EFI_TIMEOUT;
goto Exit;
}
for (; BurstCount > 0 && Index < SizeIn; BurstCount--) {
MmioWrite8((UINTN)&TisReg->DataFifo, *(BufferIn + Index));
Index++;
}
}
//
// Check the Tpm status STS_EXPECT change from 1 to 0
//
Status = TisPcWaitRegisterBits (
&TisReg->Status,
(UINT8) TIS_PC_VALID,
TIS_PC_STS_EXPECT,
TIS_TIMEOUT_C
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "The send buffer too small!\n"));
Status = EFI_BUFFER_TOO_SMALL;
goto Exit;
}
//
// Executed the TPM command and waiting for the response data ready
//
MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_GO);
Status = TisPcWaitRegisterBits (
&TisReg->Status,
(UINT8) (TIS_PC_VALID | TIS_PC_STS_DATA),
0,
TIS_TIMEOUT_B
);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "Wait for Tpm response data time out!!\n"));
Status = EFI_TIMEOUT;
goto Exit;
}
//
// Get response data header
//
Index = 0;
BurstCount = 0;
while (Index < sizeof (TPM_RSP_COMMAND_HDR)) {
Status = TisPcReadBurstCount (TisReg, &BurstCount);
if (EFI_ERROR (Status)) {
Status = EFI_TIMEOUT;
goto Exit;
}
for (; BurstCount > 0; BurstCount--) {
*(BufferOut + Index) = MmioRead8 ((UINTN)&TisReg->DataFifo);
Index++;
if (Index == sizeof (TPM_RSP_COMMAND_HDR)) break;
}
}
//
// Check the reponse data header (tag,parasize and returncode )
//
CopyMem (&Data16, BufferOut, sizeof (UINT16));
if (SwapBytes16 (Data16) != TPM_TAG_RSP_COMMAND ) {
Status = EFI_DEVICE_ERROR;
goto Exit;
}
CopyMem (&Data32, (BufferOut + 2), sizeof (UINT32));
TpmOutSize = SwapBytes32 (Data32);
if (*SizeOut < TpmOutSize) {
Status = EFI_BUFFER_TOO_SMALL;
goto Exit;
}
*SizeOut = TpmOutSize;
//
// Continue reading the remaining data
//
while ( Index < TpmOutSize ) {
for (; BurstCount > 0; BurstCount--) {
*(BufferOut + Index) = MmioRead8 ((UINTN)&TisReg->DataFifo);
Index++;
if (Index == TpmOutSize) {
Status = EFI_SUCCESS;
goto Exit;
}
}
Status = TisPcReadBurstCount (TisReg, &BurstCount);
if (EFI_ERROR (Status)) {
Status = EFI_TIMEOUT;
goto Exit;
}
}
Exit:
MmioWrite8((UINTN)&TisReg->Status, TIS_PC_STS_READY);
return Status;
}
|
