Re: [Xen-devel] [HACKATHON 2016] Mini-OS on ARM

[Julien Grall <julien.grall@xxxxxxx>]

Hi Wei,

On 05/05/16 16:57, Wei Liu wrote:
> On Thu, May 05, 2016 at 04:47:31PM +0100, Steve Capper wrote:
> > [Apologies for the late send]
> >
> > Mini-OS on ARM
> > ==============
> >
> > This session covered mini-os bringup on 64-bit ARM platforms.
> > The following points arose during discussion:
> >
> > *) 32-bit Mini-OS may have bit-rotted
> >    o) Some memory addresses may have been hard-coded for instance.
> >    o) The memory map in Xen can change between releases.
> I think this might have been fixed by Juergen.
This session was about Mini-OS on ARM and this patch is x86 specific.

The problem is Mini-OS on ARM is using hardcoded addresses and interrupt 
number for some devices. This needs to be fix if you want mini-os to 
work on any Xen ARM release.
> Author:     Juergen Gross <jgross@xxxxxxxx>
> AuthorDate: Fri Nov 20 19:32:42 2015 +0100
> Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
> CommitDate: Mon Nov 23 09:38:58 2015 +0000
>
>      minios: don't rely on specific page table allocation scheme
>
>      Today mini-os is making assumptions how the page tables it is started
>      with are being allocated. Especially it is using the number of page
>      table frames to calculate which is the first unmapped pfn.
>
>      Instead of relying on page table number assumptions just look into the
>      page tables to find the first pfn not already mapped.
>
>      Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
>      Acked-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
Cheers,

--
Julien Grall

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