as a result of our memory map editing, so strip out any empty regions.

order?

requiring each caller to decide how many entries it wants to permit.

Ignore carry flag for INT 15,88; the Ralf Brown interrupt list says
that CF is unreliable for this call.

and creating a memory map that's easier to work with than the E820 map.

down to base memory, since it is now in the base-memory-resident
.text16 section).

We now split e820 regions around ourselves, rather than just
truncating the e820 region.  This avoids the worst-case scenario of
losing all memory over 4GB.

It's more important to get the memory map right now that we're
expecting to still be loaded when the OS starts in several situations
(e.g. Linux with UNDI driver, any OS with iSCSI/AoE boot, etc.).

even when __atribute__ (( unused )) is correctly set...

continually reallocating the real-mode stack.