DBG_AC_IF(), to avoid namespace collisions.

clean separation between loading and starting, but does mean that more
PXE stacks survive the process.

Added basic El Torito ISO image boot capability

download

Make expand_buffer() a non-inline function, so that we can add debug
messages.

Expandable buffers now don't *always* round up to the next power of two.
This allows e.g. loading a 137MB ISO image on a machine with only 256MB
RAM...

provided by the divl instruction.

optimise these down to the correct single "roll"/"rorl" instruction.

version.

around which still hold pointers to variables belonging to our parent...

more easily within gPXE.

Note that we don't have function bodies for these functions yet.

correct prototypes for srandom(), rand() and srand().

value.

to avoid drops even on slow NICs.

is now gPXE-specific.  (The standard malloc() et al have been in stdlib.h
for a while).

Add free memory counter.

somewhat redundant, and also causes gas to complain when we include
the profiling code (which uses an i586 instruction).

needed now that performance is up.

anyone?