as_ctl
if ((error = as_ctl(as, 0x0, amp->size, MC_LOCK, 0, 0,
error = as_ctl(as, addr, len, cmd, attr, iarg, NULL, 0);
error = as_ctl(as, addr, len, MC_SYNC, attr,
error = as_ctl(as, addr, len, cmd, attr,
error = as_ctl(as, addr, len, cmd, attr, (uintptr_t)arg, NULL, 0);
int as_ctl(struct as *as, caddr_t addr, size_t size, int func, int attr,
error = as_ctl(as, addr, size, MC_LOCK, 0, 0, NULL, 0);
error = as_ctl(as, address, length, MC_LOCK, 0, 0, NULL, 0);
error = as_ctl(as, address, length, MC_UNLOCK, 0, 0, NULL, 0);