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Irq 7 is special. It is not just the parallel port. It can also be a
[pintos-anon]
/
src
/
threads
/
interrupt.c
diff --git
a/src/threads/interrupt.c
b/src/threads/interrupt.c
index 6d3f6bb2e269a909de1cce3cdc8ea9d14ae888b5..72b37837dcf420f98110b4e1ab23c838b3704a29 100644
(file)
--- a/
src/threads/interrupt.c
+++ b/
src/threads/interrupt.c
@@
-355,16
+355,23
@@
intr_handler (struct intr_frame *frame)
yield_on_return = false;
}
yield_on_return = false;
}
- /* Invoke the interrupt's handler.
- If there is no handler, invoke the unexpected interrupt
- handler. */
+ /* Invoke the interrupt's handler. */
handler = intr_handlers[frame->vec_no];
handler = intr_handlers[frame->vec_no];
- if (handler == NULL)
+ if (handler != NULL)
+ handler (frame);
+ else if (frame->vec_no == 0x27 || frame->vec_no == 0x2f)
{
{
+ /* There is no handler, but this interrupt can trigger
+ spuriously due to a hardware fault or hardware race
+ condition. Ignore it. */
+ }
+ else
+ {
+ /* No handler and not spurious. Invoke the unexpected
+ interrupt handler. */
intr_dump_frame (frame);
intr_dump_frame (frame);
- PANIC ("Unexpected interrupt");
+ PANIC ("Unexpected interrupt");
}
}
- handler (frame);
/* Complete the processing of an external interrupt. */
if (external)
/* Complete the processing of an external interrupt. */
if (external)