On Wed, Jul 8, 2015 at 10:49 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:Other than the enterprise distros (which _probably_ don't even have dosemu packages, and I'm 99% certain would have VM86 enabled only for 'backwards compatibility'), I highly doubt that there are any modern ones that have real-mode emulation disabled in dosemu, there's just too high of a chance of a security minded user building their own kernel with VM86 disabled (or they just have it disabled anyway in the distro kernel, Ubuntu does this, and I'm pretty sure that Debian and Fedora do also). FWIW, there's no easy way to disable such emulation on Gentoo (it is possible, it just requires some significant configuration file hacking for portage).
I don't know how to tell whether something is trying to use real mode,
but I can play this just fine in DOSEMU on my 64-bit laptop:
So a 64-bit distro obviously will never have used vm86 mode - it
doesn't work there. Never has. There's no sane way to get to vm86 mode
from long mode, that's just how the 64-bit extensions worked.
(64-bit hardware obviously does support vm86 mode, but you have to
play games with mixing long mode and CPL0 32-bit protected mode to get
there, and we never did that).
It's the 32-bit distros I would worry about. The ones that may have
well disabled emulation, because they have vm86 mode enabled.
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