Re: [Xen-devel] [PATCH v2 23/23] x86: add multiboot2 protocol support for relocatable images

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Tue, Aug 11, 2015 at 12:56:58PM -0400, Konrad Rzeszutek Wilk wrote:
> On Mon, Jul 20, 2015 at 04:29:18PM +0200, Daniel Kiper wrote:
> > Add multiboot2 protocol support for relocatable images. Only GRUB2
> > with relevant patches understands that feature. Older multiboot
>
> You may want to enumerate what those 'relevant' patches are.
>
> > protocol (regardless of version) compatible loaders ignore it
> > and everything works as usual.
> >
> > Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
> > ---
> >  xen/arch/x86/boot/head.S          |   46 
> > +++++++++++++++++++++++++++++--------
> >  xen/arch/x86/x86_64/asm-offsets.c |    1 +
> >  xen/include/xen/multiboot2.h      |   13 +++++++++++
> >  3 files changed, 50 insertions(+), 10 deletions(-)
> >
> > diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S
> > index d484f68..2520e48 100644
> > --- a/xen/arch/x86/boot/head.S
> > +++ b/xen/arch/x86/boot/head.S
> > @@ -81,6 +81,13 @@ multiboot1_header_end:
> >          /* Align modules at page boundry. */
> >          mb2ht_init MB2_HT(MODULE_ALIGN), MB2_HT(REQUIRED)
> >
> > +        /* Load address preference. */
> > +        mb2ht_init MB2_HT(RELOCATABLE), MB2_HT(OPTIONAL), \
> > +                   sym_phys(start), /* Min load address. */ \
>
> We could go straight to __start?

This specifies lowest load address not entry point.

Daniel

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