_lock_cas_ras_start
extern char _lock_cas_ras_start[];
frame->tf_iioq_head > (u_int)_lock_cas_ras_start &&
frame->tf_iioq_head = (u_int)_lock_cas_ras_start;
frame->tf_iioq_tail = (u_int)_lock_cas_ras_start + 4;