Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fix a bug in the size of the PMBR partition. Since the partition starts
at LBA 1, the size is not the mediasize in sectors, but one less.

In Write_Disk(), fix the non-error case where we returned to the
caller without closing the disk device and freeing allocated
memory. Not closing the disk device prevents GEOM from retasting
after spoiling.

Pointy hat: marcel

Fix an uninitialized variable bug that caused write_pmbr() to bogusly
return an error value that made Write_Disk() abort. While on the
subject, improve the initialization of the error variable in read_gpt()
and update_gpt() even though nothing was broken there.

Declare crc32 static. There's a copy in libz that conflicts for the
crunched binary.

Found by: make release

o Save a copy of the GPT entries for which there's a chunk with an
index referencing it. We need to know the original type and name
so that we know what to put in the table when we reconstruct it.
o Clear the table entries before we rebuild it to avoid that we
end up with stale data.
o Sequentially populate the table entries from the chunks. For the
chunks that have an index (now referencing the saved copy) we
use the saved type and name. This way we can handle unknown types
better. In all cases we update the start and end LBAs.

Don't divide the start and end of the chunk by the sector size when
filling in the GPT entry. Both are already in sector numbers (LBA)
and exactly what we need for the entry. We now write a structurally
correct GPT partitioning.

Rewrite Write_Disk() so that it creates a GPT. Note that the code is
basicly untested, but the guts is all there. I need to free up a disk
before I give it a spin.

Turn Write_Disk() into a stub for now. It needs to be rewritten to
write out a GPT and not a MBR.

Libdisk does not need to include <sys/diskslice.h> any more.

Move the remaining bits of <sys/diskslice.h> to <i386/include/bootinfo.h>

Move i386/pc98 specific bits from <sys/reboot.h> to
<i386/include/bootinfo.h> as well.

Adjust includes in sys/boot accordingly.

- Remove unused old disk pointers from Write_FreeBSD() and Fill_Disklabel()
functions.
- Clean up a few signed/unsigned warnings.

Fixed style(9)

General cleanup:
o Remove all code guarded by !defined(__ia64__). This file is
specifically written for ia64,
o Handle the case when read_block() or write_block() fails. We
don't want sysinstall(8) to signal a thumbs-up on error,
o Set the starting (cyl,hd,sect) triple to 0xFFFFFF when either
bios_hd or bios_sect is zero or the LBA us not representable
with the triple. In that case automaticly initialize the
ending triple with 0xFFFFFF as well,
o Reindent Write_Int32() as it was different than the rest of
the file,
o Remove some unused variables that appeared to be used but
were effectively useless.
o Plug a memory leak: The second timne we read the MBR, we write
out a modified block, but didn't free the memory after writing.
o Replace d1->sector_size with 512 when we read/write the MBR.
We ignore the sector size in cases we shouldn't but adhered to
it in cases it would be wrong if the sector_size wasn't 512.

This file should eventually be rewritten to write out a GPT. For
now, a MBR will do...

Add back ia64 support that was removed in the last few revisions.
I've cloned write_ia64_disk.c from write_i386_disk.c.

More lobotomy:
remove CHUNK_BSD_COMPAT, it was a bad idea, and now its gone.
remove DOSPTYP_ONTRACK, missed in OnTrack removal commit.
unifdef -DHAVE_GEOM
make tst01 compile again.

Remove unnecessary ioctls tickling kernel side to realize that we fiddled
with the disk. GEOM will automatically retaste when we closet he filedesc.

Untangle #ifdefs in the write-end of things by giving each arch its
own file and own copy of WriteDisk() to do things in.

This should have happened years ago, instead of adding #ifdefs all
over the place.