linux-kernel - Re: [PATCH] shorten the x86_64 boot setup GDT to what the comment says

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Date:	Sun, 12 Nov 2006 14:47:45 +0100
From:	"Alexander van Heukelum" <heukelum@...tmail.fm>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Vivek Goyal" <vgoyal@...ibm.com>
Cc:	"Alexander van Heukelum" <heukelum@...lshack.com>,
	"Steven Rostedt" <rostedt@...dmis.org>, "Andi Kleen" <ak@...e.de>,
	"LKML" <linux-kernel@...r.kernel.org>, sct@...hat.com,
	herbert@...dor.apana.org.au, xen-devel@...ts.xensource.com
Subject: Re: [PATCH] shorten the x86_64 boot setup GDT to what the comment says


On Fri, 10 Nov 2006 16:46:00 +0100, "Alexander van Heukelum"
<heukelum@...lshack.com> said:
> On Fri, Nov 10, 2006 at 03:01:39PM +0100, Andi Kleen wrote:
> > > Hi Andi,
> > > 
> > > (Assuming you mean: "The gdt table already is 16-byte aligned.")
> > > 
> > > Hmm. Not in the most recent version of Linus' tree, not even by
> > > concidence, and none of the patches in your quilt-current/patches touch
> > > x86_64's version of setup.S. Am I missing something?
> > 
> > The main GDT is. The boot GDT isn't, but it doesn't matter because
> > it is only used for a very short time.
> 
> Aha, thanks for clearing that up. I agree it is not important to have
> the boot GDT aligned, but I think it is preferable to make parts of the
> two versions of setup.S equal if possible.
> 
> Let's see what Steven Rostedt comes up with.
> 
> I find the relocatable image patches interesting. I wonder if one can
> get such a kernel 'running' using bochs, freedos, and loadlin ;).

Was it clear that I was sceptical about this still working? Oh well,
I tried it, and it did not break. Freedos' versions of himem and emm386 
loaded, DOS=HIGH,UMB.

Alexander
-- 
  Alexander van Heukelum
  heukelum@...tmail.fm

-- 
http://www.fastmail.fm - Same, same, but different

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