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Use the arm virtual counter in the arm64 loader

Description

Use the arm virtual counter in the arm64 loader

It exist on all ARMv8+ CPUs, and other boot loaders rely on it being
present.

Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D30410

(cherry picked from commit 0a0d6ce34d6be89cb356c7815648e455fabe3151)

Details

Provenance
andrewAuthored on May 12 2021, 7:45 AM
Differential Revision
D30410: Use the arm virtual counter to get the time on arm64
Parents
rG18ea5bc166c1: virtio: enable VTNET_LEGACY_TX when ALTQ is enabled.
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