SIR_CLOCK         132 arch/i386/include/intr.h #define	setsoftclock()	softintr(1 << SIR_CLOCK, IPL_SOFTCLOCK)
SIR_CLOCK         300 arch/i386/isa/isa_machdep.c 	IMASK(IPL_SOFTCLOCK) |= 1 << SIR_CLOCK;