FP_VIRTFP
td->td_pcb->pcb_flags |= FP_VIRTFP;
td->td_pcb->pcb_flags &= ~FP_VIRTFP;
(td->td_pcb->pcb_flags & FP_VIRTFP)
td->td_pcb->pcb_flags |= FP_VIRTFP;
td->td_pcb->pcb_flags &= ~FP_VIRTFP;
(td->td_pcb->pcb_flags & FP_VIRTFP)