If this helps take a look at the kernel documentation for details,
the relevant part is "Software cursor for vga" (file VGA-softcursor.txt)
I'm embarassed to say so, but I couldn't find doc specifcally for
kernel. I looked in /usr/doc & /usr/share/doc
No need to embarrassed, everyone has to learn stuff at some point.
The kernel documentation indeed resides in a non-standard directory.
Installing the kernel-source (package kernel-source-version) installs
a tarball named kernel-source-version.tar.bz2 in /usr/src which
includes the kernel documentation.
[...]
Joe