看板FB_security
标 题Re: Collecting entropy from device_attach() times.
发信站NCTU CS FreeBSD Server (Wed Oct 3 19:32:45 2012)
转信站ptt!csnews.cs.nctu!news.cs.nctu!FreeBSD.cs.nctu!freebsd.org!owner-free
RW <
[email protected]> writes:
> It doesn't compute it in a weird way for amd64 and most i386 systems.
> Where possible, get_cyclecount is just a wrapper for rdtsc, which I
> think it will be for all the systems you quoted (with the possible
> exception of virtualbox).
No. All the machines I tested it on had TSCs, but not all i386 machines
we support do, so get_cyclecount() is always a function call on i386.
Look at the code, or heck, disassemble my kernel if you don't believe
me.
(did you even look at my numbers?)
DES
--=20
Dag-Erling Sm=C3=B8rgrav -
[email protected]
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