LDT_CPU_SIZE
cp->cpu_m.mcpu_ldt = kmem_zalloc(LDT_CPU_SIZE, KM_SLEEP);
kmem_free(cp->cpu_m.mcpu_ldt, LDT_CPU_SIZE);
for (va = (uintptr_t)cpu->cpu_m.mcpu_ldt, len = LDT_CPU_SIZE;
LDT_CPU_SIZE, PAGESIZE);
bzero(CPU->cpu_m.mcpu_ldt, LDT_CPU_SIZE);