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Date: Mon, 11 Jul 2011 06:44:57 -0500
From: Mark Tinguely <marktinguely@gmail.com>
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To: Damjan Marion <damjan.marion@gmail.com>
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Cc: "Brian J. McGovern" <mcgovern@beta.com>, freebsd-arm@freebsd.org
Subject: Re: Suggestions for arm build for qemu?
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On 7/11/2011 4:13 AM, Damjan Marion wrote:
> On Jul 11, 2011, at 3:17 AM, Mark Tinguely wrote:
>
>> With option ARM_CACHE_LOCK_ENABLE compiled into the kernel, qemu will give an illegal instruction error.
> Huh, nice to know. I patched qemu to ignore this instruction :)
>
> BTW Any idea from where (c9, c2, {0, 0}) is coming from? I was not able to find it in ARM ARM.
>
> Damjan

Best guess it is the XScale "Read or Write data cache lock register"  
(mrc/mcr p15, 0, Rd, c9, c2, 0) via the arm_lock_cache_line() in machdep.c.

--Mark Tinguely.