Michael Brown
6c35a525da
[prefix] Use flat real mode for access to high memory
Use flat real mode rather than 16-bit protected mode for access to
high memory during installation. This simplifies the code by reducing
the number of CPU modes we need to think about, and also increases the
amount of code in common between the normal and (somewhat
hypothetical) KEEP_IT_REAL methods of operation.
Signed-off-by: Michael Brown <mcb30@ipxe.org>