request_irq library in CodeWarrior for ColdFire Linux v2.5

[Bastaix]

Where can I get the "request_irq" and "free_irq" functions library for "CodeWarrior for ColdFire Linux v2.5"

I need to communicate to RS484 port and I have to reply in less than 1 ms after message read from port to avoid bus colistions.

Thanks

[fsl_linux_spt]

I believe that request_irq and free_irq are provided by the kernel, and it should be done from a kernel module and not a userland application.

http://www.linuxjournal.com/article/6946

http://**bleep**.grm.hia.no/dat2311/man/man9/request_irq.html