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75 lines
2.6 KiB
75 lines
2.6 KiB
What: /sys/class/tpm/tpmX/ppi/ |
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Date: August 2012 |
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KernelVersion: 3.6 |
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Contact: [email protected] |
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Description: |
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This folder includes the attributes related with PPI (Physical |
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Presence Interface). Only if TPM is supported by BIOS, this |
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folder makes sense. The folder path can be got by command |
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'find /sys/ -name 'pcrs''. For the detail information of PPI, |
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please refer to the PPI specification from |
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http://www.trustedcomputinggroup.org/ |
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In Linux 4.2 ppi was moved to the character device directory. |
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A symlink from tpmX/device/ppi to tpmX/ppi to provide backwards |
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compatibility. |
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What: /sys/class/tpm/tpmX/ppi/version |
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Date: August 2012 |
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Contact: [email protected] |
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Description: |
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This attribute shows the version of the PPI supported by the |
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platform. |
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This file is readonly. |
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What: /sys/class/tpm/tpmX/ppi/request |
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Date: August 2012 |
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Contact: [email protected] |
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Description: |
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This attribute shows the request for an operation to be |
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executed in the pre-OS environment. It is the only input from |
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the OS to the pre-OS environment. The request should be an |
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integer value range from 1 to 160, and 0 means no request. |
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This file can be read and written. |
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What: /sys/class/tpm/tpmX/ppi/response |
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Date: August 2012 |
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Contact: [email protected] |
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Description: |
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This attribute shows the response to the most recent operation |
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request it acted upon. The format is "<request> <response num> |
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: <response description>". |
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This file is readonly. |
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What: /sys/class/tpm/tpmX/ppi/transition_action |
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Date: August 2012 |
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Contact: [email protected] |
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Description: |
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This attribute shows the platform-specific action that should |
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take place in order to transition to the BIOS for execution of |
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a requested operation. The format is "<action num>: <action |
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description>". |
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This file is readonly. |
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What: /sys/class/tpm/tpmX/ppi/tcg_operations |
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Date: August 2012 |
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Contact: [email protected] |
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Description: |
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This attribute shows whether it is allowed to request an |
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operation to be executed in the pre-OS environment by the BIOS |
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for the requests defined by TCG, i.e. requests from 1 to 22. |
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The format is "<request> <status num>: <status description>". |
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This attribute is only supported by PPI version 1.2+. |
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This file is readonly. |
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What: /sys/class/tpm/tpmX/ppi/vs_operations |
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Date: August 2012 |
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Contact: [email protected] |
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Description: |
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This attribute shows whether it is allowed to request an |
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operation to be executed in the pre-OS environment by the BIOS |
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for the verdor specific requests, i.e. requests from 128 to |
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255. The format is same with tcg_operations. This attribute |
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is also only supported by PPI version 1.2+. |
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This file is readonly.
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