Re: [discuss] [patch] mtrr: fix issues with large addresses

Andreas Herrmann
2007-02-06T16:16:41Z

On Tue, Feb 06, 2007 at 09:31:45AM +0000, Jan Beulich wrote:
> >>> Andi Kleen <ak@suse.de> 06.02.07 08:53 >>>
> >On Monday 05 February 2007 23:50, Siddha, Suresh B wrote:
> >> On Mon, Feb 05, 2007 at 06:19:59PM +0100, Andreas Herrmann wrote:
> >> > o added check to restrict base address to 36 bit on i386
> >>
> >> Why is this? It can go upto implemented physical bits, right?
> >
> >In theory it can, but Linux doesn't support it.
>
> I don't think I remember a restriction here, at least not below 44 bits
> (that's where pfn-s would need to become 64-bit wide).
>
> Jan
>

Hi all,

shame on me.
Wanted to fix and interface issue where base address is truncated
at 44 bit in mtrr_write().

(And just thought 36 bit would be more than enough for that 32 bit
Linux version :)

Regards,

Andreas

--
AMD Saxony, Dresden, Germany
Operating System Research Center