Re: Crashes when reading physical memory
Re: Crashes when reading physical memory
- Subject: Re: Crashes when reading physical memory
- From: mm w <email@hidden>
- Date: Fri, 13 Mar 2009 13:52:34 -0700
youps, it was only to show you the bad guy way, but you should do what
Mike told you,
use a io-descriptor and map
> But it fails after reading about 3.3 or 3.4
for the thousand points question :), yes you cannot have it that's
only a simple physical calculus
Cheers!
On Fri, Mar 13, 2009 at 1:28 PM, Hajime Inoue <email@hidden> wrote:
> Thanks, M.M., Michael, Andreas, and Terry, for your thoughts.
>
> It's clear that there are definite limitations in getting a physical memory
> dump using the same resources being dumped. However, for some purposes
> what's
> available just by dumping memory to a file is "good enough".
>
> So I used the function M.M. suggested and wrote a kext using the
> ml_phys_read_*
> functions. This works fine for ppc (I've tested on 10.3.9 and 10.5 with 0.5
> and
> 1.5G of memory, respectively). But it fails after reading about 3.3 or 3.4
> G
> on my Intel 10.5 machine.
>
> Does anyone know why this should be? One of my colleagues mentioned that he
> saw
> something about problems reading memory simultaneously being used for DMA.
> Is
> this a possibility?
>
> Also, it appears that ml_io_map is also exported. However, I can't find an
> equivalent ml_io_munmap. pmap_release isn't exported (giving a warning),
> but
> is found when the kext is loaded. Can I use pmap_release(kernel_map, ...)
> with
> the memory allocated by ml_io_map?
>
> Thanks again,
> -Jim
>
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--
-mmw
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