+ /* We still store expire_time in our state, for migration */
+ t_last_run = s->expire_time - frame_t;
+ t_now = qemu_get_clock_ns(vm_clock);
+
+ /* Process up to MAX_FRAMES_PER_TICK frames */
+ frames = (t_now - t_last_run) / frame_t;
+ if (frames > s->maxframes) {
+ int skipped = frames - s->maxframes;
+ s->expire_time += skipped * frame_t;
+ s->frnum = (s->frnum + skipped) & 0x7ff;
+ frames -= skipped;
+ }
+ if (frames > MAX_FRAMES_PER_TICK) {
+ frames = MAX_FRAMES_PER_TICK;
+ }
+
+ for (i = 0; i < frames; i++) {
+ s->frame_bytes = 0;
+ trace_usb_uhci_frame_start(s->frnum);
+ uhci_async_validate_begin(s);
+ uhci_process_frame(s);
+ uhci_async_validate_end(s);
+ /* The spec says frnum is the frame currently being processed, and
+ * the guest must look at frnum - 1 on interrupt, so inc frnum now */
+ s->frnum = (s->frnum + 1) & 0x7ff;
+ s->expire_time += frame_t;
+ }
+
+ /* Complete the previous frame(s) */