Re: [Xen-ia64-devel] Question to frametable_miss()

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxxxxxxx>]

Hi Kouya,

Am Mittwoch, 20. Juni 2007 schrieb Kouya Shimura:
> Hi Dietmar,
>
> I wrote this code.
> There is no speical reason except for my debugging.
> Currently the value should be 0.
> If Xen uses protection keys, the value must follow it too.
>
> Thanks,
> Kouya
>
> Dietmar Hahn writes:
>  > Hi,
>  >
>  > currently I'am looking at the code to bring in protection key support in
>  > xen and found the following lines in arch/ia64/xen/ivt.S within the 
>  > function GLOBAL_ENTRY(frametable_miss)
>  > ....
>  > mov r25=0x700|(PAGE_SHIFT<<2) // key=7
>  > ...
>  > mov cr.itir=r25
>  >
>  > What is the sense of the 0x700 ? Currently Xen doesn't use protection
>  > keys. So why is this explicitly set here?
>  > Many thanks for any hints!
>  >
>  > Dietmar.

I already thought in this direction.
Many thanks.

Dietmar.


_______________________________________________
Xen-ia64-devel mailing list
Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ia64-devel