Re: [PATCH] x86: Construct 32 bit boot time page tables in nativeformat.

[H. Peter Anvin]

Jeremy Fitzhardinge wrote:
> H. Peter Anvin wrote:
> > Yeah, and it's ugly for the kernel proper, so that bit is a 
> > no-brainer.  It's just a matter of hammering out the details.
> >
> > It doesn't sound from the above that you have any opinion either way 
> > about reusing the initial page tables or creating a new set, as long 
> > as they're in the same format. 
>
> Right.
>
> Xen provides a initial set of pagetables in the appropriate format, so 
> what head.S generates is moot.  For simplicity I graft the Xen-provided 
> pagetables into swapper_pg_dir in xen_start_kernel, so it is the 
> functional equivalent to the head.S pagetable construction.
>
> We also don't (yet) support PSE, so that's a non-issue for us too.

While we're mucking around in this area, there is another thing which we 
should eventually get around to fixing:

we need a set of page tables with an identity mapping as well as the 
kernel mapping, for trampolining (during startup, but also during things 
like ACPI suspend/resume.)  Right now, we let those be the swapper page 
tables, but that's probably not really a good idea, since it can hide bugs.

	-hpa
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