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Date: Sat, 24 Nov 2012 16:06:21 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Yinghai Lu <yinghai@kernel.org>
CC: "Eric W. Biederman" <ebiederm@xmission.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@elte.hu>,
        linux-kernel@vger.kernel.org, Rob Landley <rob@landley.net>,
        Matt Fleming <matt.fleming@intel.com>
Subject: Re: [PATCH v3 11/12] x86, boot: add fields to support load bzImage
 and ramdisk high
References: <1353482170-10160-1-git-send-email-yinghai@kernel.org> <1353482170-10160-12-git-send-email-yinghai@kernel.org> <50AD0CA1.8000904@zytor.com> <CAE9FiQUSjRT-r5ZE3WHVaKkUOhwFWkm9CTCv1Aa63DOsfMQMiQ@mail.gmail.com> <50AD291A.10600@zytor.com> <CAE9FiQVed0tXhbtmc_Gug0gFZ=s=j=N4B5Vr2_ZTmSj6L-65dw@mail.gmail.com> <a1ca794a-09d4-4d36-8c8c-67100cb3696e@email.android.com> <CAE9FiQXJO8uxT9Gzjv9e8XeiLzwBX7fwTFzDVy=oPfboG4L=3Q@mail.gmail.com> <CAE9FiQWeGz2TkLBrBZcoPrNABx51XK3xk58P+Zam_LRGoJdSiw@mail.gmail.com> <a8b15bf0-4e3b-4fde-9190-26890f9abf77@email.android.com> <CAE9FiQUoj9k0Tbqp8LC8Wb21_s_x8naiWX4zkX9pJG-oFnAQ9g@mail.gmail.com> <50AE70E7.6060204@zytor.com> <87haofi3d3.fsf@xmission.com> <50B104BC.90208@zytor.com> <50B124E9.400@zytor.com> <87vccud0i5.fsf@xmission.com> <CAE9FiQUnPs-edobmpwTkyuFOrYziLjBBBxHgmND37+a64H-oHw@mail.gmail.com>
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On 11/24/2012 04:04 PM, Yinghai Lu wrote:
> On Sat, Nov 24, 2012 at 3:50 PM, Eric W. Biederman
> <ebiederm@xmission.com> wrote:
>>
>> I believe all added variables between the last version of the boot
>> protocol /sbin/kexec knows about and the current time were added in the
>> initialized data section.  Certainly we can check and that will tell us
>> how likely changes in arch/x86/boot/ have been regressions in the 32bit
>> entry point support.
>>
>> As for solving this there is a simple solution.  Add a second jump
>> right after the first jump.   The variables after the second jump can
>> all be zero initialized.
>
> could use .org to force start_of_setup start from 0x1000
>
> but how about area before setup_header ? how it is full of EFI_STUB suff there.
>

Yes, it doesn't really solve the problem I fear.

	-hpa

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