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Implement get_cyclecount() on ARM64

Description

Implement get_cyclecount() on ARM64

Use Vritual Counter register associated with Generic Timer to
read the cyclecount.

Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3134

Details

Provenance
zbbAuthored on
Differential Revision
D3134: Implement get_cyclecount on ARM64
Parents
rS285744: Make thread creation work for CloudABI processes.
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