> The most difficult problem is finding the correspondence between the
> BIOS disks 0x80, 0x81, ... and the Linux disks /dev/sda, /dev/hda, ...
This is impossible without writing to the disk, but you can do a very
good job. Use the BIOS to read the first sector of every disk, and
supply userspace with the sectors via the proc filesystem.
So you might have a 512-byte file like this:
/proc/biosinfo/disks/0x80/bootsect.bin
Userspace just compares that with /dev/hda, etc. Userspace should be
able to change the data too, to match any changes to /dev/hda, etc.
Boot sectors should have a unique ID, and they usually differ by
boot code and partition data. In the unlikely event that all of
that is the same (someone used dd), you could take a guess or just
ask the user.
(and offer to add a unique ID if one is missing or not unique)
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