I am very new to linux kernel driver development. I need to develop a
driver for calling BIOS routines like get device node. I could call it
in i386 architecture using the PnP driver.
But in x86_64 arch I couldn't see any support. Even I tried to
implement it similar to the i386. But there is no API get_cpu_gdt_table().
Is there any other way to get the cpu_gdt_table? or any other way to
call the BIOS routines.

Please help me on this.