Le 15/10/2021 à 22:12, Mark Cave-Ayland a écrit : > On 15/10/2021 09:40, Laurent Vivier wrote: > >> Le 13/10/2021 à 23:21, Mark Cave-Ayland a écrit : >>> This allows the programmer's switch to be triggered via the monitor for >>> debugging >>> purposes. Since the CPU level 7 interrupt is level-triggered, use a timer >>> to hold >>> the NMI active for 100ms before releasing it again. >> >> I'm wondering if Qemu provides another way to have a level-triggered >> interrupt in this case. >> >> I' tried to see if keeping the button pressed on a mac kept the IRQ up (as >> QMP NMI does), but a real >> mac is too slow and has to many things to display it was not really >> conclusive... > > When writing the patch I rebased the outstanding MacOS patches onto the > branch, installed Macsbug > into MacOS and used "info nmi" to break into it. > > Testing glue_nmi() with: > > GLUE_set_irq(s, GLUE_IRQ_IN_NMI, 1); > GLUE_set_irq(s, GLUE_IRQ_IN_NMI, 0); > > i.e. a simple pulse didn't launch MacsBug at all. Keeping the NMI high > launches MacsBug (which is > usable) but then as soon as you exit MacsBug with ES, MacsBug breaks > immediately again making it > impossible to return to the Finder. Adding the timer allows launching MacsBug > and then > exiting/re-entering MacsBug again on demand as expected. >
I think we have to mimic the finger pressing the button.. By the way, NMI should also dumps the CPU registers under linux. Reviewied-by: Laurent Vivier <laur...@vivier.eu>
