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1f862f0f XZ |
1 | What: /sys/devices/pnp0/<bus-num>/ppi/ |
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 | |
11 | http://www.trustedcomputinggroup.org/ | |
12 | ||
13 | What: /sys/devices/pnp0/<bus-num>/ppi/version | |
14 | Date: August 2012 | |
15 | Contact: xiaoyan.zhang@intel.com | |
16 | Description: | |
17 | This attribute shows the version of the PPI supported by the | |
18 | platform. | |
19 | This file is readonly. | |
20 | ||
21 | What: /sys/devices/pnp0/<bus-num>/ppi/request | |
22 | Date: August 2012 | |
23 | Contact: xiaoyan.zhang@intel.com | |
24 | Description: | |
25 | This attribute shows the request for an operation to be | |
26 | executed in the pre-OS environment. It is the only input from | |
27 | the OS to the pre-OS environment. The request should be an | |
28 | integer value range from 1 to 160, and 0 means no request. | |
29 | This file can be read and written. | |
30 | ||
31 | What: /sys/devices/pnp0/00:<bus-num>/ppi/response | |
32 | Date: August 2012 | |
33 | Contact: xiaoyan.zhang@intel.com | |
34 | Description: | |
35 | This attribute shows the response to the most recent operation | |
36 | request it acted upon. The format is "<request> <response num> | |
37 | : <response description>". | |
38 | This file is readonly. | |
39 | ||
40 | What: /sys/devices/pnp0/<bus-num>/ppi/transition_action | |
41 | Date: August 2012 | |
42 | Contact: xiaoyan.zhang@intel.com | |
43 | Description: | |
44 | This attribute shows the platform-specific action that should | |
45 | take place in order to transition to the BIOS for execution of | |
46 | a requested operation. The format is "<action num>: <action | |
47 | description>". | |
48 | This file is readonly. | |
49 | ||
50 | What: /sys/devices/pnp0/<bus-num>/ppi/tcg_operations | |
51 | Date: August 2012 | |
52 | Contact: xiaoyan.zhang@intel.com | |
53 | Description: | |
54 | This attribute shows whether it is allowed to request an | |
55 | operation to be executed in the pre-OS environment by the BIOS | |
56 | for the requests defined by TCG, i.e. requests from 1 to 22. | |
57 | The format is "<request> <status num>: <status description>". | |
58 | This attribute is only supported by PPI version 1.2+. | |
59 | This file is readonly. | |
60 | ||
61 | What: /sys/devices/pnp0/<bus-num>/ppi/vs_operations | |
62 | Date: August 2012 | |
63 | Contact: xiaoyan.zhang@intel.com | |
64 | Description: | |
65 | This attribute shows whether it is allowed to request an | |
66 | operation to be executed in the pre-OS environment by the BIOS | |
67 | for the verdor specific requests, i.e. requests from 128 to | |
68 | 255. The format is same with tcg_operations. This attribute | |
69 | is also only supported by PPI version 1.2+. | |
70 | This file is readonly. |