Export efi runtime maps to sysfs

modulename: runtime-map.ko

configname: CONFIG_EFI_RUNTIME_MAP

Linux Kernel Configuration
└─>Firmware Drivers
└─>EFI (Extensible Firmware Interface) Support
└─>Export efi runtime maps to sysfs
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Export efi runtime memory maps to /sys/firmware/efi/runtime-map.
That memory map is used for example by kexec to set up efi virtual
mapping the 2nd kernel, but can also be used for debugging purposes.

See also
source code:
drivers/firmware/efi/runtime-map.c