linux-kernel - Re: [PATCH] THE LINUX/I386 BOOT PROTOCOL

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Message-ID: <20060828184637.GD13464@lists.us.dell.com>
Date:	Mon, 28 Aug 2006 13:46:37 -0500
From:	Matt Domsch <Matt_Domsch@...l.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Alon Bar-Lev <alon.barlev@...il.com>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	johninsd@....rr.com
Subject: Re: [PATCH] THE LINUX/I386 BOOT PROTOCOL - Breaking the 256 limit (ping)

On Mon, Aug 28, 2006 at 11:28:24AM -0700, H. Peter Anvin wrote:
> Alon Bar-Lev wrote:
> >On 8/28/06, H. Peter Anvin <hpa@...or.com> wrote:
> >>Totally pointless since we're in 16-bit mode (as is the "incl %esi")...
> >>I guess it's "better" in the sense that if we run out of that we'll
> >>crash due to a segment overrun... maybe (some BIOSes leave us
> >>unknowningly in big real mode...)
> >
> >So leave as is? Loading address into esi and reference as si?
> >Or modify the whole code to use 16 bits?
> >
> 
> Probably modifying the whole code to use 16 bits, unless there is a 
> specific reason not to (Matt?)

No reason.  I was just trying to be careful, not leaving data in the
upper bits of those registers going uninitialized.  If we know they're
not being used ever, then it's not a problem.  But I don't think
that's the source of the command line size concern, is it?

Thanks,
Matt

-- 
Matt Domsch
Software Architect
Dell Linux Solutions linux.dell.com & www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com
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