linux-kernel - Re: [PATCH v7 00/27] x86, boot, 64bit: Add support for loading ramdisk and bzImage above 4G

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Message-ID: <50ECA91A.4040109@zytor.com>
Date:	Tue, 08 Jan 2013 15:17:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 00/27] x86, boot, 64bit: Add support for loading ramdisk
 and bzImage above 4G

On 01/08/2013 01:19 PM, Borislav Petkov wrote:
> On Tue, Jan 08, 2013 at 01:15:41PM -0800, H. Peter Anvin wrote:
>> Yes, but why bother...
>
> I suspected something like that to be the reason after reading into that
> section of the APM of how one needs to jump through hoops to do one
> lousy far jump.
>

The only thing that started this was that I got tempted into a 
microoptimization that happens to be valid and documented on Intel, but 
not AMD.  Given that it doesn't actually work lretq is probably the 
least insane option.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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