Date: Mon, 14 Aug 2006 11:15:22 -0700 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: Stanislav Sedov <ssedov@mbsd.msk.ru> Cc: freebsd-hackers@freebsd.org Subject: Re: exception handling in kernel code Message-ID: <20060814181521.GQ99774@funkthat.com> In-Reply-To: <20060814194729.436fc453@localhost> References: <20060814124658.1d416cbe@localhost> <200608140932.57875.jhb@freebsd.org> <20060814194729.436fc453@localhost>
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Stanislav Sedov wrote this message on Mon, Aug 14, 2006 at 19:47 +0600:
> I've implemented driver to allow user-level code to read MSRs (Model
> specific registers) (like linux's /dev/cpu/msr). It's required for
> some programs like x86info.
>
> As long as not all MSRs documented and reading/writing unexistent MSR
> leads to GP fault, I need to recover in that case.
You should make a MD API for reading these out (if one doesn't already
exist) that handle the faulting for you, and then have your driver hook
into this api...
I had to do something similar for accessing PCI config registers
that don't exist and cause a fault...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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