linux-kernel - Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings

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Message-ID: <462D1A02.5060403@zytor.com>
Date:	Mon, 23 Apr 2007 13:41:38 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	virtualization@...ts.osdl.org, Chuck Ebbert <cebbert@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 10/28] i386: map enough initial memory to create lowmem
 mappings

Eric W. Biederman wrote:
> Jeremy Fitzhardinge <jeremy@...p.org> 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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