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- What: /sys/devices/pnp0/<bus-num>/ppi/
- Date: August 2012
- Kernel Version: 3.6
- Contact: xiaoyan.zhang@intel.com
- Description:
- This folder includes the attributes related with PPI (Physical
- Presence Interface). Only if TPM is supported by BIOS, this
- folder makes sense. The folder path can be got by command
- 'find /sys/ -name 'pcrs''. For the detail information of PPI,
- please refer to the PPI specification from
- http://www.trustedcomputinggroup.org/
- What: /sys/devices/pnp0/<bus-num>/ppi/version
- Date: August 2012
- Contact: xiaoyan.zhang@intel.com
- Description:
- This attribute shows the version of the PPI supported by the
- platform.
- This file is readonly.
- What: /sys/devices/pnp0/<bus-num>/ppi/request
- Date: August 2012
- Contact: xiaoyan.zhang@intel.com
- Description:
- This attribute shows the request for an operation to be
- executed in the pre-OS environment. It is the only input from
- the OS to the pre-OS environment. The request should be an
- integer value range from 1 to 160, and 0 means no request.
- This file can be read and written.
- What: /sys/devices/pnp0/00:<bus-num>/ppi/response
- Date: August 2012
- Contact: xiaoyan.zhang@intel.com
- Description:
- This attribute shows the response to the most recent operation
- request it acted upon. The format is "<request> <response num>
- : <response description>".
- This file is readonly.
- What: /sys/devices/pnp0/<bus-num>/ppi/transition_action
- Date: August 2012
- Contact: xiaoyan.zhang@intel.com
- Description:
- This attribute shows the platform-specific action that should
- take place in order to transition to the BIOS for execution of
- a requested operation. The format is "<action num>: <action
- description>".
- This file is readonly.
- What: /sys/devices/pnp0/<bus-num>/ppi/tcg_operations
- Date: August 2012
- Contact: xiaoyan.zhang@intel.com
- Description:
- This attribute shows whether it is allowed to request an
- operation to be executed in the pre-OS environment by the BIOS
- for the requests defined by TCG, i.e. requests from 1 to 22.
- The format is "<request> <status num>: <status description>".
- This attribute is only supported by PPI version 1.2+.
- This file is readonly.
- What: /sys/devices/pnp0/<bus-num>/ppi/vs_operations
- Date: August 2012
- Contact: xiaoyan.zhang@intel.com
- Description:
- This attribute shows whether it is allowed to request an
- operation to be executed in the pre-OS environment by the BIOS
- for the verdor specific requests, i.e. requests from 128 to
- 255. The format is same with tcg_operations. This attribute
- is also only supported by PPI version 1.2+.
- This file is readonly.
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