On Wed, Apr 17, 2013 at 03:04:48PM +0200, Andreas Färber wrote: > Hi, > > Am 17.04.2013 11:21, schrieb Moese, Michael: > >> I think your best bet is to ask GreenSocs if you need support for this > >> codebase. > > > > I think you'd be right when you point me to GreenSocs, but.. they don't > > seem to support all this anymore. > > > > > >> This is really ancient in QEMU terms, and how the internals work has > >> changed enormously since then. > > > > Given I'd port their work over to a current QEMU source tree, would it be > > save then to use a signal, like SIGUSR2? > > I cannot find any use of these signals in the (old) sources, but I want to > > be sure not to add unwanted side effects > > when I just change the signal handler in my initialization code. > > The differences seem to be only in some files of the sources, maybe I can > > port this stuff over to the current version, > > as this might be useful not only to me for my thesis right now but to some > > other developer for hardware-software- > > co-simulation. >
Hi, > If you were to rebase onto the latest git version, you could as of > yesterday use the qtest protocol interface outside of qtest to inject > IRQs, IIUC. :-) My understanding is that you can only monitor IRQ state over qtest, not directly control it. It would be nice to add support for it though. I don't think signals are a good approach. You'd need to pass some data along with the signal (low/high and irq nr/id) so it's probably better to do it on top of some kind of data passing protocol. Some years ago I hacked on a binary remote bus protocol (RBUS) allowing remote devices to be attached to QEMU machines. I was using it at AXIS to connect multiple QEMU instances for modeling heterogenous CPU arch SOCs and as a test port (like QTest). Later, Petalogix and Peter Crosthwaite (I think) used a modified version of it to do co-simulation of QEMU with remote devices running on FPGAs. I havent rebased it for years though and I also dont think rbus was good enough. But I am interested to do something like that again. I guess it can be viewed as a binary qtest protocol on steroids. Best regards, Edgar
