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framework has significantly changed the driver has moved to a new file. While it shares some code with the existing driver this has been modified to work better with the intrng framework. This has been tested on the ThunderX servers in the netperf cluster and has been used to boot them for other testing, including DTrace and hwpmc. With this we can use intrng on all supported arm64 platforms I was able to test on. It is expected we will move to intrng soon, and disable the old arm64 interrupt framework. Obtained from: ABT Systems Ltd Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D6437
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