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Using BIOS Interrupt

I use a Digital-Logic MSM-P5 CPU-board with a LTC1232 watchdog and
RTLinux 3.1 with
2.2.19 kernel. On that board is a
special BIOS extension in interrupt 15h available to program the
watchdog.
It has to be strobed at least every 800ms. For that purpose it seems to
be 
reasonable to create a periodic rt-thread. But as far as I know, it's
problematic 
to use BIOS interrupts in Linux. 
Thanks for any hint how to do that.

Torsten Merz