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- What: /sys/firmware/secvar
- Date: August 2019
- Contact: Nayna Jain <[email protected]>
- Description: This directory is created if the POWER firmware supports OS
- secureboot, thereby secure variables. It exposes interface
- for reading/writing the secure variables
- What: /sys/firmware/secvar/vars
- Date: August 2019
- Contact: Nayna Jain <[email protected]>
- Description: This directory lists all the secure variables that are supported
- by the firmware.
- What: /sys/firmware/secvar/format
- Date: August 2019
- Contact: Nayna Jain <[email protected]>
- Description: A string indicating which backend is in use by the firmware.
- This determines the format of the variable and the accepted
- format of variable updates.
- What: /sys/firmware/secvar/vars/<variable name>
- Date: August 2019
- Contact: Nayna Jain <[email protected]>
- Description: Each secure variable is represented as a directory named as
- <variable_name>. The variable name is unique and is in ASCII
- representation. The data and size can be determined by reading
- their respective attribute files.
- What: /sys/firmware/secvar/vars/<variable_name>/size
- Date: August 2019
- Contact: Nayna Jain <[email protected]>
- Description: An integer representation of the size of the content of the
- variable. In other words, it represents the size of the data.
- What: /sys/firmware/secvar/vars/<variable_name>/data
- Date: August 2019
- Contact: Nayna Jain h<[email protected]>
- Description: A read-only file containing the value of the variable. The size
- of the file represents the maximum size of the variable data.
- What: /sys/firmware/secvar/vars/<variable_name>/update
- Date: August 2019
- Contact: Nayna Jain <[email protected]>
- Description: A write-only file that is used to submit the new value for the
- variable. The size of the file represents the maximum size of
- the variable data that can be written.
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