* Luck, Tony <tony.luck@xxxxxxxxx> [2007-08-14 23:10]:
> But there isn't a user-mode accessible way to convert them to
> physical addresses.
Well, there is a way (indirectly).
Because there's /dev/mem, any userspace program can expose the page tables of
the kernel. If you have debugging information of the kernel available, you can
use the crash utility (http://people.redhat.com/~anderson/) which is normally
used to analyse dump files in the running system.
$ crash -s
crash> vtop 0xa00000020b520000
VIRTUAL PHYSICAL
a00000020b520000 a3078494000
PAGE DIRECTORY: a000000100708000
PGD: a000000100708000 => 30030ac000
PUD: e0000030030ac000 => 3006d54000
PMD: e000003006d54828 => 63003f44000
PTE: e000063003f46a40 => 100a3078494661
PAGE: a3078494000
PTE PHYSICAL FLAGS
100a3078494661 a3078494000 (P|MA_WB|PL_0|AR_RWX|A|D|ED)
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
a0007ffb2ffcc018 a3078494000 ------- ----- 0 500000000000000
Of course it may be easier to use a simple kernel module. ;-)
Thanks,
Bernhard
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