Copy stable/11@r303970 to releng/11.0 as part of the 11.0-RELEASE
cycle.

Prune svn:mergeinfo from the new branch, and rename it to RC1.

Update __FreeBSD_version.

Use the quarterly branch for the default FreeBSD.conf pkg(8) repo and
the dvd1.iso packages population.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Use the yield instruction in the arm64 cpu_spinwait. This instruction is
a hint to the hardware the software is not performing a task.

Sponsored by: ABT Systems Ltd

Use the saved program state register to detect when an exception frame is
from userpsace. Previously we could have triggered a panic by trying to
jump to a kernel address from userland as the trap handling code thought we
received an ast in kernel mode.

Obtained from: ABT Systems Ltd
Sponsored by: The FreeBSD Foundation

Decode and print the ID_AA64* registers on boot. These registers hold
information on what the core supports. In most cases these will be
identical across most CPUs in the SoC, however there may be the case where,
with a big.LITTLE setup they may differ. In this case we print the
decoded data on all CPUs.

Reviewed by: kib
Sponsored by: ABT Systems Ltd
Differential Revision: https://reviews.freebsd.org/D4725

Block secondary ITS instances from attaching on ARM64

Currently FreeBSD supports only single PIC controller. Some systems
that have more than one (like ThunderX dual-socket) fails to boot.
Disable other PICes until proper handling is implemented in the
generic interrupt code.

Reviewed by: imp
Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3682

Add SMP support to GICv3 and ITS drivers

Introduce supprot for SMP to GICv3 and ITS drivers.

Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3299

Apply erratum for mrs ICC_IAR1_EL1 speculative execution on ThunderX

ERRATUM: 22978, 23154
PASS (rev.): 1.0/1.1

Reviewed by: imp
Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3184

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

Improve ARM64 CPU_MATCH

Add a method to identify CPU based on RAW MIDR value.

Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3117

Rework CPU identification on ARM64

This commit reworks the code responsible for identification of
the CPUs during runtime.
It is necessary to provide a way for workarounds and erratums
to be applied only for certain HW versions.

The copy of MIDR is now stored in pcpu to provide a fast and
convenient way for assambly code to read it (pcpu is used quite often
so there is a chance it's inside the cache).
The MIDR is also better way of identification than using user-friendly
cpu_desc structure, because it can be compiled into comparision of
single u32 with only one access to the memory - this is crucial
for some erratums which are called from performance-critical
places.

Changes in cpu_identify makes this function safe to be called
on non-boot CPUs.

New function CPU_MATCH was implemented which returns boolean
value based on mathing masked MIDR with chip identification.
Example of usage:

printf("is thunder: %d\n", CPU_MATCH(CPU_IMPL_MASK | CPU_PART_MASK,
CPU_IMPL_CAVIUM, CPU_PART_THUNDER, 0, 0));
printf("is generic: %d\n", CPU_MATCH(CPU_IMPL_MASK | CPU_PART_MASK,
CPU_IMPL_ARM, CPU_PART_FOUNDATION, 0, 0));

Reviewed by: andrew
Obtained from: Semihalf
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3030

Renumber clauses to avoid missing 3

Add the start of the arm64 machine headers. This is the subset needed to
start getting userland libraries building.

Reviewed by: imp
Sponsored by: The FreeBSD Foundation