Re: [OpenBIOS] [RFC] Make BootX from Mac OS X 10.4 work

[Alexander Graf]

On 31.07.2009, at 12:46, Blue Swirl wrote:
> On Thu, Jul 30, 2009 at 7:00 PM, Alexander Graf wrote:
> > Using this patch stacked on Steven Noonan's I was able to make  
> > BootX from
> > Mac OS X 10.4 load XNU successfully in qemu-system-ppc.
> >
> > Unfortunately, most of this patch is nothing but a mere hack to  
> > find out
> > what we really need to get this working.
> >
> > Also I didn't manage to get anything but 10.4 running. Other  
> > versions broke
> > in the partition table interpretation.
> >
> > I would not feel good taking the patch as is, because it would be  
> > better to
> > implement the correct Forth magic to make the real callbacks work.  
> > Here is
> > what I found to be broken:
> > unselect-dev is missing
> > local variables don't work ({ ... })
> > I ran into an endless loop, getting isi and dsi faults on the
> >
> > same 2
> >    addresses all the time
> >
> > Also, Qemu's only usable Desktop PPC target is a G3 Beige which is  
> > only
> > supported up to 10.2.8 IIRC. So even getting the bootloader running  
> > for
> > 10.4 didn't exactly buy me much.
>
> mac99 also should do something. What machines have the best support?
> > Don't apply the patch as is!
> > It'd be great to see someone build on this!
> >
> > arch/ppc/qemu/ofmem.c |    4 ++--
> >  modules/client.c      |   40 ++++++++++++++++++++++++++++++++++++++ 
> > ++
> >  2 files changed, 42 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/ppc/qemu/ofmem.c b/arch/ppc/qemu/ofmem.c
> > index a1a8fb1..32642e2 100644
> > --- a/arch/ppc/qemu/ofmem.c
> > +++ b/arch/ppc/qemu/ofmem.c
> > @@ -716,8 +716,8 @@ hash_page_32( ulong ea, ulong phys, int mode )
> >    /* out of slots, just evict one */
> >    if( !found ) {
> >           i = next_grab_slot + 1;
> >           next_grab_slot = (next_grab_slot + 1) % 8;
> >           i = next_grab_slot + 3;
> >           next_grab_slot = (next_grab_slot + 3) % 8;
> >  }
> >  i--;
> >  upte[i*2] = cmp;
> >
> > diff --git a/modules/client.c b/modules/client.c
> > index a2e8405..a8c89ff 100644
> > --- a/modules/client.c
> > +++ b/modules/client.c
> > @@ -49,6 +49,46 @@ handle_calls( prom_args_t *pb )
> >                pb->nargs, pb->nret);
> >  #endif
> >
> > +#if 1
> >   if (!strcmp(pb->service, "interpret"))
> >   {
> >           char *ns;
> >           ns = strstr((char*)pb->args[0], "{ ; dpth }");
> >           if (ns) return 0;

^^^^^^^
> >           ns = strstr((char*)pb->args[0], "dev /chosen ");
> >           if (ns) memcpy(ns, " \" /chosen\"", 11);
> >   }
> >   else if (!strcmp(pb->service, "call-method"))
> >   {
> >           if (!strncmp((char*)pb->args[0], "slw_init_keymap",  
> >
> > 15)) {
> >                   char *a = (char*)malloc(20);
> >                   memset(a, 0x00, 20);
> >                   pb->args[4] = (uint32_t)a;
> >                   pb->args[3] = 0;
> >                   return 0;
> >           }
> >           if (!strncmp((char*)pb->args[0], "slw_emit",  
> >
> > strlen("slw_emit"))) {
> >                   PUSH( (char)pb->args[2] );
> >                   fword("emit");
> >                   return 0;
> >           }
> >           if (!strncmp((char*)pb->args[0], "slw_cr",  
> >
> > strlen("slw_cr"))) {
> >                   PUSH( '\n' );
> >                   fword("emit");
> >                   return 0;
> >           }
> >           if (!strncmp((char*)pb->args[0],  
> >
> > "slw_update_keymap", strlen("slw_update_keymap"))) return 0;
> >           if (!strncmp((char*)pb->args[0],  
> >
> > "slw_set_output_level", strlen("slw_set_output_level"))) return 0;
> >           if (!strncmp((char*)pb->args[0], "slw_spin_init",  
> >
> > strlen("slw_spin_init"))) return 0;
> >           if (!strncmp((char*)pb->args[0], "slw_spin",  
> >
> > strlen("slw_spin"))) return 0;
>
> Is the loader trying to install these callbacks or does it assume that
> they exist already?

It installs them in the interpret call I marked above.

Alex