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1What: /sys/class/tpm/tpmX/ppi/2Date: August 20123KernelVersion: 3.64Contact: xiaoyan.zhang@intel.com5Description:6 This folder includes the attributes related with PPI (Physical7 Presence Interface). Only if TPM is supported by BIOS, this8 folder makes sense. The folder path can be got by command9 'find /sys/ -name 'pcrs''. For the detail information of PPI,10 please refer to the PPI specification from11 12 http://www.trustedcomputinggroup.org/13 14 In Linux 4.2 ppi was moved to the character device directory.15 A symlink from tpmX/device/ppi to tpmX/ppi to provide backwards16 compatibility.17 18What: /sys/class/tpm/tpmX/ppi/version19Date: August 201220Contact: xiaoyan.zhang@intel.com21Description:22 This attribute shows the version of the PPI supported by the23 platform.24 This file is readonly.25 26What: /sys/class/tpm/tpmX/ppi/request27Date: August 201228Contact: xiaoyan.zhang@intel.com29Description:30 This attribute shows the request for an operation to be31 executed in the pre-OS environment. It is the only input from32 the OS to the pre-OS environment. The request should be an33 integer value range from 1 to 160, and 0 means no request.34 This file can be read and written.35 36What: /sys/class/tpm/tpmX/ppi/response37Date: August 201238Contact: xiaoyan.zhang@intel.com39Description:40 This attribute shows the response to the most recent operation41 request it acted upon. The format is "<request> <response num>42 : <response description>".43 This file is readonly.44 45What: /sys/class/tpm/tpmX/ppi/transition_action46Date: August 201247Contact: xiaoyan.zhang@intel.com48Description:49 This attribute shows the platform-specific action that should50 take place in order to transition to the BIOS for execution of51 a requested operation. The format is "<action num>: <action52 description>".53 This file is readonly.54 55What: /sys/class/tpm/tpmX/ppi/tcg_operations56Date: August 201257Contact: xiaoyan.zhang@intel.com58Description:59 This attribute shows whether it is allowed to request an60 operation to be executed in the pre-OS environment by the BIOS61 for the requests defined by TCG, i.e. requests from 1 to 22.62 The format is "<request> <status num>: <status description>".63 This attribute is only supported by PPI version 1.2+.64 This file is readonly.65 66What: /sys/class/tpm/tpmX/ppi/vs_operations67Date: August 201268Contact: xiaoyan.zhang@intel.com69Description:70 This attribute shows whether it is allowed to request an71 operation to be executed in the pre-OS environment by the BIOS72 for the verdor specific requests, i.e. requests from 128 to73 255. The format is same with tcg_operations. This attribute74 is also only supported by PPI version 1.2+.75 This file is readonly.76