vgabios: Attempt to detect old x86emu and force a fault.

Check for cases where the leal instruction does not work.  This
instruction is known to not be emulated properly on old versions of
x86emu.  If a broken version of x86emu is found, force a fault that
x86emu will easily detect.  This should help prevent soft failures
when running old software.

Signed-off-by: Kevin O'Connor <>
1 file changed