RE: Crashes when reading physical memory
RE: Crashes when reading physical memory
- Subject: RE: Crashes when reading physical memory
- From: Hajime Inoue <email@hidden>
- Date: Fri, 13 Mar 2009 17:22:37 -0400
I should probably have stated that there are 4 G in the 10.5 Intel machine.
-Jim
-----Original Message-----
From: mm w [mailto:email@hidden]
Sent: Friday, March 13, 2009 4:53 PM
To: Hajime Inoue
Cc: email@hidden
Subject: Re: Crashes when reading physical memory
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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