1 What: /sys/class/tpm/tpmX/ppi/ !! 1 What: /sys/devices/pnp0/<bus-num>/ppi/
2 Date: August 2012 2 Date: August 2012
3 KernelVersion: 3.6 !! 3 Kernel Version: 3.6
4 Contact: xiaoyan.zhang@intel.com 4 Contact: xiaoyan.zhang@intel.com
5 Description: 5 Description:
6 This folder includes the attri 6 This folder includes the attributes related with PPI (Physical
7 Presence Interface). Only if T 7 Presence Interface). Only if TPM is supported by BIOS, this
8 folder makes sense. The folder 8 folder makes sense. The folder path can be got by command
9 'find /sys/ -name 'pcrs''. For 9 'find /sys/ -name 'pcrs''. For the detail information of PPI,
10 please refer to the PPI specif 10 please refer to the PPI specification from
11 <<
12 http://www.trustedcomputinggro 11 http://www.trustedcomputinggroup.org/
13 12
14 In Linux 4.2 ppi was moved to !! 13 What: /sys/devices/pnp0/<bus-num>/ppi/version
15 A symlink from tpmX/device/ppi <<
16 compatibility. <<
17 <<
18 What: /sys/class/tpm/tpmX/ppi/versio <<
19 Date: August 2012 14 Date: August 2012
20 Contact: xiaoyan.zhang@intel.com 15 Contact: xiaoyan.zhang@intel.com
21 Description: 16 Description:
22 This attribute shows the versi 17 This attribute shows the version of the PPI supported by the
23 platform. 18 platform.
24 This file is readonly. 19 This file is readonly.
25 20
26 What: /sys/class/tpm/tpmX/ppi/reques !! 21 What: /sys/devices/pnp0/<bus-num>/ppi/request
27 Date: August 2012 22 Date: August 2012
28 Contact: xiaoyan.zhang@intel.com 23 Contact: xiaoyan.zhang@intel.com
29 Description: 24 Description:
30 This attribute shows the reque 25 This attribute shows the request for an operation to be
31 executed in the pre-OS environ 26 executed in the pre-OS environment. It is the only input from
32 the OS to the pre-OS environme 27 the OS to the pre-OS environment. The request should be an
33 integer value range from 1 to 28 integer value range from 1 to 160, and 0 means no request.
34 This file can be read and writ 29 This file can be read and written.
35 30
36 What: /sys/class/tpm/tpmX/ppi/respon !! 31 What: /sys/devices/pnp0/00:<bus-num>/ppi/response
37 Date: August 2012 32 Date: August 2012
38 Contact: xiaoyan.zhang@intel.com 33 Contact: xiaoyan.zhang@intel.com
39 Description: 34 Description:
40 This attribute shows the respo 35 This attribute shows the response to the most recent operation
41 request it acted upon. The for 36 request it acted upon. The format is "<request> <response num>
42 : <response description>". 37 : <response description>".
43 This file is readonly. 38 This file is readonly.
44 39
45 What: /sys/class/tpm/tpmX/ppi/transi !! 40 What: /sys/devices/pnp0/<bus-num>/ppi/transition_action
46 Date: August 2012 41 Date: August 2012
47 Contact: xiaoyan.zhang@intel.com 42 Contact: xiaoyan.zhang@intel.com
48 Description: 43 Description:
49 This attribute shows the platf 44 This attribute shows the platform-specific action that should
50 take place in order to transit 45 take place in order to transition to the BIOS for execution of
51 a requested operation. The for 46 a requested operation. The format is "<action num>: <action
52 description>". 47 description>".
53 This file is readonly. 48 This file is readonly.
54 49
55 What: /sys/class/tpm/tpmX/ppi/tcg_op !! 50 What: /sys/devices/pnp0/<bus-num>/ppi/tcg_operations
56 Date: August 2012 51 Date: August 2012
57 Contact: xiaoyan.zhang@intel.com 52 Contact: xiaoyan.zhang@intel.com
58 Description: 53 Description:
59 This attribute shows whether i 54 This attribute shows whether it is allowed to request an
60 operation to be executed in th 55 operation to be executed in the pre-OS environment by the BIOS
61 for the requests defined by TC 56 for the requests defined by TCG, i.e. requests from 1 to 22.
62 The format is "<request> <stat 57 The format is "<request> <status num>: <status description>".
63 This attribute is only support 58 This attribute is only supported by PPI version 1.2+.
64 This file is readonly. 59 This file is readonly.
65 60
66 What: /sys/class/tpm/tpmX/ppi/vs_ope !! 61 What: /sys/devices/pnp0/<bus-num>/ppi/vs_operations
67 Date: August 2012 62 Date: August 2012
68 Contact: xiaoyan.zhang@intel.com 63 Contact: xiaoyan.zhang@intel.com
69 Description: 64 Description:
70 This attribute shows whether i 65 This attribute shows whether it is allowed to request an
71 operation to be executed in th 66 operation to be executed in the pre-OS environment by the BIOS
72 for the verdor specific reques 67 for the verdor specific requests, i.e. requests from 128 to
73 255. The format is same with t 68 255. The format is same with tcg_operations. This attribute
74 is also only supported by PPI 69 is also only supported by PPI version 1.2+.
75 This file is readonly. 70 This file is readonly.
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