et)
	+-------------------+
</pre>

The first longword indicates the presence and validity of other fields in
the multiboot_info structure.  All as-yet-undefined bits must be set to
zero by the boot loader.   Any set bits that the OS does not understand
should be ignored.  Thus, the flags field also functions as a version
indicator, allowing the multiboot_info structure to be expanded in the
future without breaking anything.<P>

If bit 0 in the multiboot_info.flags word is set, then the 'mem_*' fields
are va