Linux Real Mode Interface in a linux kernel module

I have a BIOS function I need to call from time to time on an embedded system, and using LRMI I was able to call it successfully from a user space program. Now I want to do the same from a loadable kernel module.

Is there any way to do this? Some oth开发者_StackOverflower library maybe?

It has to do with the mode the Processor is in (which is protected mode, which turns on after bios initializes all of the resources). In order to use BIOS interrupts again, you will have to use v8086 mode, which is when the processor emulates a 16bit real mode machine. You can then set your registers and call your interrupt with a virtual mode program.

Here's how to get into virtual mode: http://www.brokenthorn.com/Resources/OSDev23.html

You could also try and switching into Real mode, but this involves resetting the processor. I don't know how you would do this programmatically, since you probably can't.