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VRNG(4) Device Drivers Manual (sparc64) VRNG(4)

vrngvirtual random number generator

vrng0 at vbus?

The vrng driver provides support for the random number generation service provided by the UltraSPARC Hypervisor as found on sun4v systems.

Driven by periodic checks for available data from the generator, vrng supplies entropy to the random(4) driver for common usage.

intro(4), random(4), vbus(4)

The vrng driver first appeared in OpenBSD 4.5.

The vrng driver was written by Mark Kettenis <>.

The vrng driver should probably do periodic “health checks” when running in a Trusted Domain, but currently does not.

July 16, 2013 OpenBSD-7.0