| 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. |
