K 10
svn:author
V 3
mav
K 8
svn:date
V 27
2020-02-07T15:27:57.596215Z
K 7
svn:log
V 755
MFC r326956 (by cem):
Implement ACPI CPU support when Processor object is not present

By the ACPI standard (ACPI 5 chapter 8.4 Declaring Processors) Processors
can be implemented in 2 distinct ways:

* Through a Processor object type (which provides P_BLK)
* Through a Device object type

Prior to this change, the FreeBSD driver only supported the former.  AMD
Epyc / Poweredge systems we are testing both implement the latter only.  Add
the missing support.

Because P_BLK is not defined in the device object case, C-states entering
must be completely controlled via _CST methods rather than P_LVL2/3.

John Baldwin points out that ACPI 6.0 formally deprecates the Processor
keyword, so eventually processors will only be enumerated as Device objects.

END