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46 lines
1.8 KiB
46 lines
1.8 KiB
What: /sys/firmware/secvar |
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Date: August 2019 |
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Contact: Nayna Jain <[email protected]> |
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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 <[email protected]> |
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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 <[email protected]> |
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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 <[email protected]> |
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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 <[email protected]> |
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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<[email protected]> |
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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 <[email protected]> |
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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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