Merge the SYSLINUX and EXTLINUX patching code and core code, removing
EXTLINUX as a separate derivative.  All the disk-based systems now use
the same code.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Reduce sector 1 space pressure by moving objects that aren't needed by
Sector 1 proper into an "extended patch area".  While we're mucking
with the installer code, make the syslxint and extlinux installer code
even more similar.  It should now be pretty straightforward to
outright merge the code.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Put all the Linux ioctl header magic into a single shared file, and
try to make it as generally useful as possible.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

-O0 is good for debugging, but sucks for production.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Add missing const

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Switch to consistent use of 64-bit sector pointers; this should enable
booting even for individual *partitions* larger than 2 TB.  In order
to not slow down the boot too much, switch the initial load from an
enumeration to an extent map.  This means the table gets larger (since
we have to assume the worst case), but it simplifies the Sector 1 code
(since we can push all the hard stuff into the installer), and will
speed up booting in the general case.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Implement the !GPT handover protocol in the Syslinux core, and handle
partition offsets above 2 TB.  We do not yet handle filesystem sizes
above 2 TB, but that should be a reasonably straightforward extension
at this time (need to switch to 8-byte block pointers).

This finally meant moving getlinsec out of the boot sector, since it
no longer fits.  Instead have a very simple getonesec implementation
in the boot sector.  getlinsec still fits in Sector 1, although it
doesn't leave space for very many block pointers.  That's still better
than adding yet another boot loader stage, however.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

-o has been supported for a very long time; recommend using -t
instead, but for now proceed with an error message.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Clean up warnings in checkin
146c34a2 Make syslinux installer real "pathbased"

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>