PS/2 soft reset

[chschnell]

When executing the REBOOT console command under FreeDOS 1.4 the PS/2 keyboard becomes unresponsive after rebooting.

You can reproduce it using the XCom profile (which is FreeDOS-based) or with the attached HDA image file fdos14-64m.zip which contains a minimal FreeDOS 1.4 installation (no audio or network). The KolibriOS profile actually freezes after a soft reset when it initializes the PS/2 mouse.

In all cases, a PS/2 device is in trouble after a reboot was triggered from within the guest OS.

I believe the reason for this to be an invalid runtime state of the PS2 object after reboot_internal() has been invoked.

So I added a method PS2.reset() which simply resets all scalar object members back to the values assigned in the PS2 constructor, and then I added a call to this.devices.ps2.reset() in reboot_internal() along the same pattern in which the other devices virtio_9p, virtio_console and virtio_net are handled there.

This fixed it.

It seems that FreeDOS expects the PS/2 device to be reset after triggering a soft reset (which suggests that other emulators do so). Obviously though, most other guest OSes do not have that problem.

I don't think that this patch could have any negative effects on the other OSes, but before creating a PR I just want to make sure that I didn't miss anything here.

[copy]

Sounds good, feel free to send a PR.

[chschnell]

All right, it's checked in. I did not want to duplicate all those assignments so I moved them out of the constructor, hope that's ok.

This also greatly simplifies using the FreeDOS 1.4 installer which triggers a reboot during installation, and before it needed some trickery to reenter that 2nd phase of the installation process with the keybord intact.