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What: /sys/firmware/secvar
Date: August 2019
Contact: Nayna Jain <nayna@linux.ibm.com>
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 <nayna@linux.ibm.com>
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 <nayna@linux.ibm.com>
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 <nayna@linux.ibm.com>
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 <nayna@linux.ibm.com>
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<nayna@linux.ibm.com>
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 <nayna@linux.ibm.com>
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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