On Sat, Mar 04, 2000 at 03:27:49AM +0100, Lyle Coder wrote:
> Hi,
> The function in question is get_smp_config
>
> 1) No it doesent call set_fixmap
> 2) Even if it did, it wont be able to see > 1GB
I don't think (2) is true. All set_fixmap does is to set a PTE into
the kernel map, and PTEs point to physical addresses. The 1GB limitation
is a virtual address mapping limitation, not physical.
-Andi
>
> Ingo, am I correct?
>
> Best Wishes,
> Lyle
>
>
> >From: Andi Kleen <ak@muc.de>
> >To: x_coder@hotmail.com (Lyle Coder)
> >CC: linux-kernel@vger.rutgers.edu
> >Subject: Re: HIGH MEMORY access
> >Date: 04 Mar 2000 02:30:07 +0100
> >
> >x_coder@hotmail.com (Lyle Coder) writes:
> >
> > > Hello All,
> > > I have a question. The BIOS engineers said that the MPS tables will be
> >in
> > > the highest region of the available RAM... greater than 1 GB if so much
> > > memory is available.
> > > Further more, the MPS tables will be in a region reported "unusable" by
> >E820
> > > (Thats mentioned in the E820 spec).
> > >
> > > So my question is this...
> > > 1) How should we initialize mappings for arbitrary RAM above 1GB so
> >early
> > > on? Should we just set aside a page directory for temporary
> >installation of
> > > translations and provide a clean API to do so? We will need this for
> >ACPI
> > > and PAE too.
> >
> >Can't you just use set_fixmap, like the current smp code already does for
> >MP bios tables ?
> >
> >
> >-Andi
> >
> >--
> >This is like TV. I don't like TV.
>
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