specifying alignment of loader files

[Mark Johnston]

On Tue, Jun 12, 2018 at 11:11:25AM -0600, Warner Losh wrote:
> On Tue, Jun 12, 2018 at 11:04 AM, Mark Johnston <markj at freebsd.org> wrote:
> 
> > Hi,
> >
> > I'm writing some code which processes a file loaded by the loader.  I
> > want the file's contents to be available at a certain alignment in
> > memory, and as far as I can see, the loader provides no alignment
> > guarantees today.  The access will happen early enough during boot that
> > making an aligned copy of the data will be awkward, so I'd like the
> > loader to provide the desired alignment.
> >
> > I'm considering adding a new "module_align" variable that would specify
> > the alignment for a given file type, and plumb that through to
> > command_load().  Does anyone have an alternate suggestion, or an
> > objection to my proposal?
> >
> 
> I thought the loader already did that for ELF sections... Why not wrap your
> file in such a segment?

In this case it's a raw binary file (CPU microcode), and I want to be
able to load it without any modifications or wrappers.