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arm64: parse HWCAP values using user_cpu_desc
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Authored by mhorne on Aug 14 2020, 9:04 PM.
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Details

Summary

The hard work of parsing fields per-CPU, handling heterogeneous
features, and excluding features from userspace is already done by
update_special_regs. We can build our set of HWCAPs from the result.

This also exposed a small bug in update_special_regs, in which the
generated bitmask was not wide enough, and as a result some bits
weren't being exposed in user_cpu_desc.

While here, adjust some formatting.

Test Plan

Exposed set of hwcaps is identical before and after the change on EC2 Graviton2.

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rS FreeBSD src repository - subversion
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