cpu_intr_establish
cpu_intr_establish(int level, int ipl, int (*func)(void *), void *arg)
#define cpu_intr_establish(n,s,f,a) ((*systemsw.s_intr_establish)(n,s,f,a))
#define cpu_intr_establish(n,s,f,a) ((*systemsw.s_intr_establish)(n,s,f,a))
cpu_intr_establish(int level, int ipl, int (*func)(void *), void *arg)