Re: [PATCH 10/28] i386: map enough initial memory to create lowmemmappings

[H. Peter Anvin]

Eric W. Biederman wrote:
> Jeremy Fitzhardinge <jeremy@xxxxxxxx> writes:
>
> > H. Peter Anvin wrote:
> > > It would be *trivial* to make a certain number of page table slots
> > > available at the end of the head.S-generated map. 
> > Or you could use a fixmap.
>
> That certain number of page table slots should be the fixmap slots.
> If you do that bt_ioremap works, we remove a boatload of special cases
> and the code becomes simpler.

It's probably worth noting that several of the non-PC ports already do 
exactly this, although in a hacky way.  Grep for pg0 and you'll find it.

	-hpa
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