sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Add PSCI affinity info return values

These can be returned from the PSCI AFFINITY_INFO call. This is not
marked as optional so bhyve will need to implement it & can use these
macros.

Sponsored by: Arm Ltd

Add a psci macro to build a version value

Add PSCI_VER that takes a major and minor version and builds the value
returned by the firmware. This will be used by bhyve.

Sponsored by: Arm Ltd

Allow psci.h to be used by userspace

Wrap parts of psci.h that aren't usable by userspace in _KERNEL checks.
This allows it to be used to implement PSCI and SMCCC by bhyve in
userspace.

Sponsored by: Arm Ltd
Sponsored by: Innovate UK
Sponsored by: The FreeBSD Foundation

psci: finish psci_present implementation

This was already declared in psci.h, but it was never defined/set. Do
this now, so we can use it to decide if enable-method in /cpus FDT nodes
should be inspected later on. While we're here, convert it to a
boolean.

Reviewed by: andrew (slightly earlier version)
Differential Revision: https://reviews.freebsd.org/D34553

Add generic arm/arm64 secure-monitor SMCCC interface and switch
PSCI code to use it.

This interface will also be used by Intel Stratix 10 platform.

This was not tested on arm due to lack of PSCI-enabled arm hardware
lying around.

Reviewed by: andrew
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D21439

PSCI: Don't take missing implementation of psci get_version() as fatal.
Minimalistic PSCI implementation in U-Boot doesn't implement get_version()
method for some SoC. In this case, use PSCI version declared by 'psci' node
in DT as fallback.

MFC after: 2 weeks

Move psci_call to a header file so we can use it in other files to
communicate with the firmware.

Sponsored by: DARPA, AFRL

Add a handler for the PSCI_FEATURES function. This needs PSCI 1.0, so
check for this, returning an error if the version is too old.

Sponsored by: DARPA, AFRL

Add the PSCI_FEATURES function ID. This is found in PSCI 1.0 and is used
to query if a given function is implemented and its features.

Sponsored by: DARPA, AFRL

Add a function to find the PSCI version the firmware implements from
outside the PSCI driver.

MFC after: 1 week
Sponsored by: DARPA, AFRL

Call the PSCI reset from cpu_reset on arm64. When rebooting from DDB the
kernel calls this directly so the event handler is not called, meaning
the computer fails to reboot.

Tested by: cognet
MFC after: 1 week
Sponsored by: DARPA, AFRL

Create a new PSCI error code and use it to signal that starting the CPU is
impossible as the PSCI firmware is missing.

Sponsored by: ABT Systmes Ltd

Add a driver for the ARM Power State Coordination Interface (PSCI). This
handles versions 0.1 and 0.2 of the standard on 32-bit ARM.

With this driver we can shutdown in QEMU. Further work is needed to
turn secondary cores on on boot and to support later revisions of the
specification.

Submitted by: Robin Randhawa <Robin.Randhawa at ARM.com>
Sponsored by: The FreeBSD Foundation