Documentation/ABI/testing/sysfs-secvar

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.