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