[Qemu-devel] Re: [OpenBIOS] QEMU OpenBIOS booting?

From: Laurent Vivier <Laurent@vivier.eu>
To: The OpenBIOS Mailinglist <openbios@openbios.org>
Cc: Alexander Graf <alex@csgraf.de>, qemu-devel@nongnu.org
Subject: [Qemu-devel] Re: [OpenBIOS] QEMU OpenBIOS booting?
Date: Sun, 19 Apr 2009 22:21:04 +0200	[thread overview]
Message-ID: <1240172464.5659.22.camel@Quad> (raw)
In-Reply-To: <f488382f0904191301o94b5d96ha82406cf13e0bc26@mail.gmail.com>

Le dimanche 19 avril 2009 à 13:01 -0700, Steven Noonan a écrit :
> On Sun, Apr 19, 2009 at 12:47 PM, Laurent Vivier <Laurent@lvivier.info> wrote:
> > Le dimanche 19 avril 2009 à 11:59 -0700, Steven Noonan a écrit :
> >> On Sun, Apr 19, 2009 at 1:24 AM, Laurent Vivier <Laurent@lvivier.info> wrote:
> >> > Le dimanche 19 avril 2009 à 00:50 -0700, Steven Noonan a écrit :
> >> >> On Tue, Apr 14, 2009 at 10:46 PM, Steven Noonan <steven@uplinklabs.net> wrote:
> >> >> > On Sun, Apr 12, 2009 at 1:39 AM, Laurent Vivier <Laurent@lvivier.info> wrote:
> >> >> >> OpenBIOS is not able to boot MacOS X.
> >> >> >
> >> >> > Well, that's a silly limitation. Is there a reason this isn't
> >> >> > implemented? I see that the Mac-on-Linux OpenBIOS version has such
> >> >> > support, so it seems strange that the QEMU version does not.
> >> >>
> >> >> I don't know if anyone here is actually interested (this list seems
> >> >> -very- quiet), but...
> >> >
> >> > Hi,
> >> >
> >> >> I've been hacking at OpenBIOS for a bit, and I got it to properly read
> >> >> Mac OS X discs (it kept failing because it would hit an Apple
> >> >> Partition Map header instead of an HFS+ filesystem header). I'm
> >> >> working on adding an XCOFF loader, too, so it should be able to boot
> >> >> Mac OS X soon.
> >> >
> >> > You can copy it from OpenHackWare.
> >> > I made some tests and it seems to have some memory conflicts between
> >> > MacOS kernel and OpenBIOS.
> >
> > In fact what I have is a Mach-O loader which load mach_kernel from "/".
> >
> >> > Good Luck.
> >> >
> >>
> >> Two more pre-XCOFF loader commits up:
> >> http://github.com/tycho/openbios/commit/e43daa3447b5ce4a2b05b2f32882e49891156200
> >> http://github.com/tycho/openbios/commit/7023b78a10f5632fd08d4749615efd3e73ab1036
> >
> > Seems good but do you really need to check for embedded XCOFF in this
> > patch and are you really able to execute the boot-script ?
> 
> Oh, I should say that it does _execute_ the boot-script, but I don't
> know if it's properly handled by the Forth interpreter. Any idea what
> the boot-script you cite is supposed to actually _do_ (I gave up
> trying to read Forth at around 3 AM last night)?

I think the script seeks in itself the address of the embedded XCOFF
(after "-BOOT"), computes it size, copies it to load-base, initializes
it ("init-program") and executes it ("go").

> >
> > In Panther Install CD, BootX is:
> >
> > <CHRP-BOOT>
> > <COMPATIBLE>
> > MacRISC MacRISC3 MacRISC4
> > </COMPATIBLE>
> > <DESCRIPTION>
> > Boot Loader for Mac OS X.
> > </DESCRIPTION>
> > <OS-BADGE-ICONS>
> > </OS-BADGE-ICONS>
> > <BOOT-SCRIPT>
> > ...
> > <BOOT-SCRIPT>
> > load-base
> > begin
> >  dup 6 " &lt;/CHRP" $= if
> >  6 + dup 6 " -BOOT&gt;" $= if
> >   8 + true
> >  else
> >   false
> >  then
> >  else
> >  1+ false
> >  then
> > until
> > ( xcoff-base )
> > load-size over load-base - -
> > ( xcoff-base xcoff-size )
> > load-base swap move
> > init-program go
> > </BOOT-SCRIPT>
> > </CHRP-BOOT>
> > [...XCOFF HERE]
> >
> >
> > Regards,
> > Laurent
> >
> >
> > --
> > OpenBIOS                 http://openbios.org/
> > Mailinglist:  http://lists.openbios.org/mailman/listinfo
> > Free your System - May the Forth be with you
> 