clock software interrupt

[Zlatan Ibrahimovic]

Hi folks,
I've seen clock software interrupt thread (referring to clk_ithd in
kern/kern_intr.c); watching to manpages I read that priority is used
as vector for that thread. My question is how can I call this software
handler? There's no track in the IDT for the associated handler...
(ia32, for better check see i386/i386/exception.s).

Thanks,
Mark Swetter