Messages in this thread | | | Date | Mon, 08 Jun 1998 16:56:06 -0400 | From | Philip Gladstone <> | Subject | mmap'ing /dev/mem |
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When I try and map /dev/kmem, many of the pages that I get back are all 0. This is strange as the actual pages contain data.
From a quick look at the code in remap_pte_range, it only seems to map pages which are above the top of ram (for access to devices) or which are Reserved. I don't understand which pages fall into the latter category -- in particular a page which contains a networking buffer doesn't seem to be included.
Happily, reading from /dev/kmem works fine, but I had hoped to avoid all the data copying.
Is there a reason for this inconsistency?
Philip -- Philip Gladstone +1 781 530 2461 Raptor Systems / Axent Technologies Waltham, MA http://www.raptor.com/
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