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

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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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elfnote: place note in a PT_NOTE program header

Some tools (firecraker loader) only check for notes in PT_NOTE program
headers, so make sure the notes added using the ELFNOTE macro end up
in such he

elfnote: place note in a PT_NOTE program header

Some tools (firecraker loader) only check for notes in PT_NOTE program
headers, so make sure the notes added using the ELFNOTE macro end up
in such header.

Output from readelf -Wl for and amd64 kernel after the change:

Elf file type is EXEC (Executable file)
Entry point 0xffffffff8038a000
There are 11 program headers, starting at offset 64

Program Headers:
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
PHDR 0x000040 0xffffffff80200040 0x0000000000200040 0x000268 0x000268 R 0x8
INTERP 0x0002a8 0xffffffff802002a8 0x00000000002002a8 0x00000d 0x00000d R 0x1
[Requesting program interpreter: /red/herring]
LOAD 0x000000 0xffffffff80200000 0x0000000000200000 0x189e28 0x189e28 R 0x200000
LOAD 0x18a000 0xffffffff8038a000 0x000000000038a000 0xe447e8 0xe447e8 R E 0x200000
LOAD 0xfce7f0 0xffffffff811ce7f0 0x00000000011ce7f0 0x6b955c 0x6b955c R 0x200000
LOAD 0x1800000 0xffffffff81a00000 0x0000000001a00000 0x000140 0x000140 RW 0x200000
LOAD 0x1801000 0xffffffff81a01000 0x0000000001a01000 0x1c8480 0x5ff000 RW 0x200000
DYNAMIC 0x1800000 0xffffffff81a00000 0x0000000001a00000 0x000140 0x000140 RW 0x8
GNU_RELRO 0x1800000 0xffffffff81a00000 0x0000000001a00000 0x000140 0x000140 R 0x1
GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RW 0
NOTE 0x1687ae0 0xffffffff81887ae0 0x0000000001887ae0 0x0001c0 0x0001c0 R 0x4

Section to Segment mapping:
Segment Sections...
[...]
10 .note.gnu.build-id .note.Xen

Reported by: cperciva
Fixes: 1a9cdd373a6a ('xen: add PV/PVH kernel entry point')
Fixes: 93ee134a24fa ('Integrate support for xen in to i386 common code.')
Sponsored by: Citrix Systems R&D
Reviewed by: emaste
Differential revision: https://reviews.freebsd.org/D35611

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Remove the pre-ARMv6 and pre-INTRNG code.
ARM has required ARMV6+ and INTRNg for some time now, so remove
always false #ifdefs and unconditionally do always true #ifdefs.

sys/arm: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error

sys/arm: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

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Merge ^/head r313055 through r313300.

MFhead@r313243

Remove an old use of _ARM_ARCH_6, we are moving to using the standard
__ARM_ARCH >= 6 spelling.

Sponsored by: ABT Systems Ltd

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Sync to HEAD@r274766

Merge from head@274682

opt_global.h is included automatically in the build. No need to
explicitly include it in these places.

Sponsored by: Netflix

Sync to HEAD@r274095.

IFC @r273338

Add an elf not so kgdb detects the kernel as a FreeBSD elf file. The
ELFNOTE macro is based on one from the FreeBSD/ARM Xen tree [1].

Obtained from: Julien Grall <julien.grall AT linaro.org> [1]

MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

Merge head up to r263906.

Remove the unreferenced DATA() macro. That leaves only GET_CURTHREAD_PTR()
which was added by cognet in 2012, so remove the no-longer-applicable
license stuff that referred to all the old contents, a

Remove the unreferenced DATA() macro. That leaves only GET_CURTHREAD_PTR()
which was added by cognet in 2012, so remove the no-longer-applicable
license stuff that referred to all the old contents, and put in a
standard 2-clause BSD license (to cover the 6 lines of useful code left
in here).

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Arrange for arm fork_trampoline() to return to userland via the standard
swi_exit code in exception.S instead of having its own inline expansion
of the DO_AST and PULLFRAME macros. That means that n

Arrange for arm fork_trampoline() to return to userland via the standard
swi_exit code in exception.S instead of having its own inline expansion
of the DO_AST and PULLFRAME macros. That means that now all references
to the PUSH/PULLFRAME and DO_AST macros are localized to exception.S,
so move the macros themselves into there and remove them from asmacros.h

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Change the way the asm GET_CURTHREAD_PTR() macro is defined so that code
using it doesn't have to have an "AST_LOCALS" macro somewhere in the file.

MFH: tracking commit

Sponsored by: The FreeBSD Foundation

Merge head up to r262222 (last merge was incomplete).