K 10
svn:author
V 8
jhibbits
K 8
svn:date
V 27
2022-06-22T15:58:54.895405Z
K 7
svn:log
V 1076
arm64: Print per-CPU cache summary

Summary:
It can be useful to see a summary of CPU caches on bootup.  This is done
for most platforms already, so add this to arm64, in the form of (taken
from Apple M1 pro test):

  L1 cache: 192KB (instruction), 128KB (data)
  L2 cache: 12288KB (unified)

This is printed out per-CPU, only under bootverbose.

Future refinements could instead determine if a cache level is shared
with other cores (L2 is shared among cores on some SoCs, for instance),
and perform a better calculation to the full true cache sizes.  For
instance, it's known that the M1 pro, on which this test was done, has 2
12MB L2 clusters, for a total of 24MB.  Seeing each CPU with 12288KB L2
would make one think that there's 12MB * NCPUs, for possibly 120MB
cache, which is incorrect.

Sponsored by:	Juniper Networks, Inc.
Reviewed by:	#arm64, andrew
Differential Revision: https://reviews.freebsd.org/D35366

(cherry picked from commit 139ba152c9c91fad9b63ccd2382a80f753f217b9)

Git Hash:   c70276686572fa4976babed8aa936ed3d3f2a52d
Git Author: jhibbits@FreeBSD.org
END