On Tue, May 28, 2019 at 09:57:02PM -0500, Katherine Rohl wrote: > I have my i8042 device for vmd(8) mostly implemented. It’s only missing a few > commands, but since there are no PS/2 input devices yet, there isn’t very > much in the way of testing I can do beyond ensuring that commands act as they > should. > > I have a couple questions about expected behavior, mostly related to the 8042 > output port. > > * The 8042 controls the CPU reset line, but I’m not sure what the behavior > should be in terms of vmm/vmd. Send a reset command if the reset line gets > pulled low?
The reset line being asserted (deasserted?) can be shunted to the same code in vmd that processes triple faults, thus resetting the CPU. > * The 8042 controls Gate A20, which doesn’t seem to exist in the VM. I just > have the output line not hooked up to anything. That OK? Ignore for now. > * There is nothing hooked up to the PS/2 ports since adding input devices is > out of scope for my current diff. > * Commands F0-F3 pulse 8042 output port bits low for 6uS. How should such > timing be implemented in a vmd device? > We don't have very precise timing, so I'm not sure how you're going to get a 6uS pulse. What does an attached device do with such a pulse in a normal scenario? > Once I get these cleared up, I should have a diff ready by the weekend. The > 8042 already gets detected in the OpenBSD boot process! > > Katherine >
