I'm working with dosemu and would like to add an emulated PCI device to
the emulated DOS machine.  Obviously, I know enough about the hardware
I want to emulate to believe I can write an emulation of it.

But I'm not sure where to hook it in.  (I'm working based on commit
18f6f5cdf1beceae8c7532718bfaf423e4a44f6a.)  I found
src/base/async/pci_bios.c and src/base/dev/misc/pci.c, but they appear
to be all about giving the emulated machine access to real PCI hardware
on the real machine.  That's not what I want; I'm trying to supply the
emulated machine with hardware that is not actually present.

There is src/env/video/matrox.c, which appears to be monkeying with PCI
stuff, but even that checks the real machine's /proc/pci and doesn't
run unless there's real hardware backing it (see matroxProbe(), which
incidentally is incorrectly commented as being MGAProbe).

Is this something that's already got hooks supporting it, or am I
breaking new ground here?

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