Re: Referencing PHYSICAL (what you see on the bus) memory?

[Werner Almesberger <Werner.Almesberger@epfl.ch>]

Richard B. Johnson wrote:
> I am finishing up a memory-test program. I want to get the
> true linear address of some failing memory. I have obtained
> the virtual (user-space) address.
> 
> Since going through all the PTEs seems to be a bitch, I thought
> it would be easier to do the following:

Hmm, for some unusual definition of "easy", perhaps ...

For an ugly hack that works remarkably well, look at ptable.c in Andrew
Tridgell's capture program: http://samba.org/picturebook/

Note: you probably also want to check if you find multiple addresses
for the page, i.e. if the hack didn't quite work. (Due to odd
side-effects, incomplete address decoding, etc.)

- Werner

-- 
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 / Werner Almesberger, ICA, EPFL, CH           Werner.Almesberger@epfl.ch /
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