on 17/02/2008 18:19 Erich Dollansky said the following: > Hi, > > Andriy Gapon wrote: > > I cannot tell you if this is still the same for modern designs. > >> ... -> iret -> interrupted again > > This was the behaviour earlier. >> Is this a deterministic behavior ? Or some timings are at play? > > The PIC should never release the Interrupt signal to the CPU as long as > a single interrupt is not serviced. > > But the 8259 can be programmed to trigger via level or slope. > > So, this behaviour is only seen when level triggering is used. > > As I said at the bginning, I do not know how current designs handle it.
But I thought level/edge thing is about interrupts between devices and PIC, not between PIC and CPU. I might be confused, though. -- Andriy Gapon _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
