Re: [Qemu-devel] [PATCH] Add multi-boot kernel loading support

[Alexander Graf]

On 02.02.2009, at 23:42, Anthony Liguori wrote:

> Rene Rebe wrote:
> > Hi all,
> >
> > Alexander Graf implemented multi-boot kernel loading during
> > his work to run Darwin inside Qemu/KVM. As the boot loader
> > expects to load the kernel in an EFI environment a custom
> > booter is used to load the kernel using a legacy BIOS.
> >
> > This is a port of the patch to the new extload / INT 19
> > machinery (including minor cleanups).
> >
> > Signed-off-by: René Rebe <address@hidden>
> >
> > Index: elf_ops.h
> > ===================================================================
> > --- elf_ops.h    (revision 6501)
> > +++ elf_ops.h    (working copy)
> > @@ -195,6 +195,10 @@
> >     }
> >
> >     if (ELF_MACHINE != ehdr.e_machine)
> > +#if (ELF_MACHINE == EM_X86_64) && !defined(CONFIG_USER_ONLY)
> > +      /* x86_64 systems can run i386 code as well */
> > +      if(ehdr.e_machine != EM_386)
> > +#endif
> >         goto fail;
> >
> >     if (pentry)
>
> Seems like an unrelated fix.

Actually it's not. If you want to load a 32-bit elf (multiboot)  
executable on an x86_64 system, you need this patch.

Alex