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Author SHA1 Message Date
Michael Brown b6ee89ffb5 [legal] Relicense files under GPL2_OR_LATER_OR_UBDL
Relicense files for which I am the sole author (as identified by
util/relicense.pl).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
2015-03-02 14:17:31 +00:00
Michael Brown 05719804b9 [rng] Add RTC-based entropy source
The RTC-based entropy source uses the nanosecond-scale CPU TSC to
measure the time between two 1kHz interrupts generated by the CMOS
RTC.  In a physical machine these clocks are driven from independent
crystals, resulting in some observable clock drift.  In a virtual
machine, the CMOS RTC is typically emulated using host-OS
constructions such as SIGALRM.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
2012-02-28 11:18:48 +00:00