Preserve %esi and %edi for all BIOS calls. This is probably only necessary

for get_diskinfo(), whose BIOS call sets %es:%edi in some cases, although
most documentation says that it doesn't change %edi in the cases that
happened to matter (for hard disks).

This shall be in 2.1.6 and 2.2.

Submitted by:	Tor.Egge@idt.ntnu.no
		(except I kept the unnecessary preservation of %edx and %ecx)

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