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arm64: Reuse aps_started to simplify SMP boot
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Authored by andrew on May 15 2025, 5:10 PM.
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Details

Summary

We need to know when all CPUs have booted. Rather than locking and
counting when starting CPUs we can count on the boot CPU to set
smp_started.

Sponsored by: Arm Ltd

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rG FreeBSD src repository
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