linux-kernel - Re: [PATCH] reserve_early end-of-conventional-memory to 1MB

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Message-ID: <47C3306E.8060401@zytor.com>
Date:	Mon, 25 Feb 2008 13:17:34 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alexander van Heukelum <heukelum@...tmail.fm>
CC:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander van Heukelum <heukelum@...lshack.com>
Subject: Re: [PATCH] reserve_early end-of-conventional-memory to 1MB

Alexander van Heukelum wrote:
> 
> Hello hpa,
> 
> I failed to find a comment referring to 0x413 or int 0x12 in
> arch/x86/kernel. I do know the comment in Documentation/i386/boot.txt,
> however, suggesting that "INT 12h" _should_ be used, but that it would
> be pointless for zImage and old bzImage kernels, because they _have_
> to be started from 0x90000 anyway. New bzImage kernels do not have
> this limitation, and smart bootloaders simply put them at much
> lower addresses, like 0x40000. (I know: you know.) My point is just
> that the argument not to use 0x413 in the bootloader is not valid
> for this case.
> 

OK, let me see if I can dig up the comment I thought I found at one 
point, and maybe found out the history behind it.  Either that, or find 
out that my memory is faulty ;)

	-hpa
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