You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.6 KiB
75 lines
2.6 KiB
What: /sys/class/tpm/tpmX/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/
|
|
|
|
In Linux 4.2 ppi was moved to the character device directory.
|
|
A symlink from tpmX/device/ppi to tpmX/ppi to provide backwards
|
|
compatibility.
|
|
|
|
What: /sys/class/tpm/tpmX/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/class/tpm/tpmX/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/class/tpm/tpmX/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/class/tpm/tpmX/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/class/tpm/tpmX/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/class/tpm/tpmX/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.
|
|
|