Re: [Xen-devel] Re: Xen 3.2 and Big Real Mode support?

To:	Guillaume Thouvenin <guillaume.thouvenin@xxxxxxxxxxxx>
Subject:	Re: [Xen-devel] Re: Xen 3.2 and Big Real Mode support?
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Thu, 31 Jan 2008 10:36:31 +0000
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On 31/1/08 10:18, "Guillaume Thouvenin" <guillaume.thouvenin@xxxxxxxxxxxx>
wrote:

> On Thu, 31 Jan 2008 09:53:51 +0000
> Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> 
>> On 31/1/08 09:48, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> wrote:
>> 
>>> On 31/1/08 09:42, "Guillaume Thouvenin" <guillaume.thouvenin@xxxxxxxxxxxx>
>>> wrote:
> 
> Ok thanks for the hint.
> 
> So I will mask bit 25 and 26 of edx (that indicate respectively SSE and
> SEE2 features) and bit 0 of ecx (that indicates SSE3 feature). I will
> see if it allows me to boot the installation CD.

I reproduced the problem. CPUID is not executed before the crash. Also a
disassembly of that area of memory does not look like sane 16-bit code. So I
think something has gone wrong before we get to the (probably bogus) MOVHPS
instruction.

 -- Keir

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