Commit | Line | Data |
---|---|---|
b8e98dcd | 1 | What: /sys/class/tpm/tpmX/ppi/ |
1f862f0f XZ |
2 | Date: August 2012 |
3 | Kernel Version: 3.6 | |
4 | Contact: xiaoyan.zhang@intel.com | |
5 | Description: | |
6 | This folder includes the attributes related with PPI (Physical | |
7 | Presence Interface). Only if TPM is supported by BIOS, this | |
4e79162a | 8 | folder makes sense. The folder path can be got by command |
1f862f0f XZ |
9 | 'find /sys/ -name 'pcrs''. For the detail information of PPI, |
10 | please refer to the PPI specification from | |
b8e98dcd | 11 | |
1f862f0f XZ |
12 | http://www.trustedcomputinggroup.org/ |
13 | ||
b8e98dcd JS |
14 | In Linux 4.2 ppi was moved to the character device directory. |
15 | A symlink from tpmX/device/ppi to tpmX/ppi to provide backwards | |
16 | compatibility. | |
17 | ||
18 | What: /sys/class/tpm/tpmX/ppi/version | |
1f862f0f XZ |
19 | Date: August 2012 |
20 | Contact: xiaoyan.zhang@intel.com | |
21 | Description: | |
22 | This attribute shows the version of the PPI supported by the | |
23 | platform. | |
24 | This file is readonly. | |
25 | ||
b8e98dcd | 26 | What: /sys/class/tpm/tpmX/ppi/request |
1f862f0f XZ |
27 | Date: August 2012 |
28 | Contact: xiaoyan.zhang@intel.com | |
29 | Description: | |
30 | This attribute shows the request for an operation to be | |
31 | executed in the pre-OS environment. It is the only input from | |
32 | the OS to the pre-OS environment. The request should be an | |
33 | integer value range from 1 to 160, and 0 means no request. | |
34 | This file can be read and written. | |
35 | ||
b8e98dcd | 36 | What: /sys/class/tpm/tpmX/ppi/response |
1f862f0f XZ |
37 | Date: August 2012 |
38 | Contact: xiaoyan.zhang@intel.com | |
39 | Description: | |
40 | This attribute shows the response to the most recent operation | |
41 | request it acted upon. The format is "<request> <response num> | |
42 | : <response description>". | |
43 | This file is readonly. | |
44 | ||
b8e98dcd | 45 | What: /sys/class/tpm/tpmX/ppi/transition_action |
1f862f0f XZ |
46 | Date: August 2012 |
47 | Contact: xiaoyan.zhang@intel.com | |
48 | Description: | |
49 | This attribute shows the platform-specific action that should | |
50 | take place in order to transition to the BIOS for execution of | |
51 | a requested operation. The format is "<action num>: <action | |
52 | description>". | |
53 | This file is readonly. | |
54 | ||
b8e98dcd | 55 | What: /sys/class/tpm/tpmX/ppi/tcg_operations |
1f862f0f XZ |
56 | Date: August 2012 |
57 | Contact: xiaoyan.zhang@intel.com | |
58 | Description: | |
59 | This attribute shows whether it is allowed to request an | |
60 | operation to be executed in the pre-OS environment by the BIOS | |
61 | for the requests defined by TCG, i.e. requests from 1 to 22. | |
62 | The format is "<request> <status num>: <status description>". | |
63 | This attribute is only supported by PPI version 1.2+. | |
64 | This file is readonly. | |
65 | ||
b8e98dcd | 66 | What: /sys/class/tpm/tpmX/ppi/vs_operations |
1f862f0f XZ |
67 | Date: August 2012 |
68 | Contact: xiaoyan.zhang@intel.com | |
69 | Description: | |
70 | This attribute shows whether it is allowed to request an | |
71 | operation to be executed in the pre-OS environment by the BIOS | |
72 | for the verdor specific requests, i.e. requests from 128 to | |
73 | 255. The format is same with tcg_operations. This attribute | |
74 | is also only supported by PPI version 1.2+. | |
75 | This file is readonly. |