686         struct xhci_TRB_t event_trb, origin_trb; // event ring trb以及其对应的command trb  in xhci_hc_irq_handler()  local
690         xhci_get_trb(&event_trb, xhci_hc[cid].current_event_ring_vaddr);  in xhci_hc_irq_handler()
693 …      struct xhci_TRB_cmd_complete_t *event_trb_ptr = (struct xhci_TRB_cmd_complete_t *)&event_trb;  in xhci_hc_irq_handler()
696 …while ((event_trb.command & 1) == xhci_hc[cid].current_event_ring_cycle) // 循环处理处于当前周期的所有event ring  in xhci_hc_irq_handler()
699 …      struct xhci_TRB_cmd_complete_t *event_trb_ptr = (struct xhci_TRB_cmd_complete_t *)&event_trb;  in xhci_hc_irq_handler()
701             if ((event_trb.command & (1 << 2)) == 0) // 当前event trb不是由于short packet产生的  in xhci_hc_irq_handler()
712                         origin_vaddr = (uint64_t)phys_2_virt(event_trb.param);  in xhci_hc_irq_handler()
721                             origin_trb.command |= (event_trb.command & 0xff000000);  in xhci_hc_irq_handler()
722                             origin_trb.status = event_trb.status;  in xhci_hc_irq_handler()
725                             origin_trb.status = event_trb.status;  in xhci_hc_irq_handler()
749                     __write4b((uint64_t)phys_2_virt(event_trb.param),  in xhci_hc_irq_handler()
750 …                      (event_trb.status | XHCI_IRQ_DONE)); // return code + bytes *not* transferred  in xhci_hc_irq_handler()
761             xhci_get_trb(&event_trb, xhci_hc[cid].current_event_ring_vaddr);  in xhci_hc_irq_handler()
762             if (((struct xhci_TRB_normal_t *)&event_trb)->TRB_type == TRB_TYPE_LINK)  in xhci_hc_irq_handler()
765                 xhci_get_trb(&event_trb, xhci_hc[cid].current_event_ring_vaddr);  in xhci_hc_irq_handler()