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Xiaoyan Zhang1f862f02012-08-22 18:47:21 +08001What: /sys/devices/pnp0/<bus-num>/ppi/
2Date: August 2012
3Kernel Version: 3.6
4Contact: xiaoyan.zhang@intel.com
5Description:
6 This folder includes the attributes related with PPI (Physical
7 Presence Interface). Only if TPM is supported by BIOS, this
Masanari Iida4e79162a2012-11-08 21:57:35 +09008 folder makes sense. The folder path can be got by command
Xiaoyan Zhang1f862f02012-08-22 18:47:21 +08009 'find /sys/ -name 'pcrs''. For the detail information of PPI,
10 please refer to the PPI specification from
11 http://www.trustedcomputinggroup.org/
12
13What: /sys/devices/pnp0/<bus-num>/ppi/version
14Date: August 2012
15Contact: xiaoyan.zhang@intel.com
16Description:
17 This attribute shows the version of the PPI supported by the
18 platform.
19 This file is readonly.
20
21What: /sys/devices/pnp0/<bus-num>/ppi/request
22Date: August 2012
23Contact: xiaoyan.zhang@intel.com
24Description:
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
31What: /sys/devices/pnp0/00:<bus-num>/ppi/response
32Date: August 2012
33Contact: xiaoyan.zhang@intel.com
34Description:
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
40What: /sys/devices/pnp0/<bus-num>/ppi/transition_action
41Date: August 2012
42Contact: xiaoyan.zhang@intel.com
43Description:
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
50What: /sys/devices/pnp0/<bus-num>/ppi/tcg_operations
51Date: August 2012
52Contact: xiaoyan.zhang@intel.com
53Description:
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
61What: /sys/devices/pnp0/<bus-num>/ppi/vs_operations
62Date: August 2012
63Contact: xiaoyan.zhang@intel.com
64Description:
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.