score: Add AArch64 port

This adds a CPU port for AArch64(ARMv8) with support for exceptions and
interrupts.

spec/build/cpukit/cpuaarch64.yml

@@ -0,0 +1,36 @@
+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+build-type: objects
+cflags: []
+copyrights:
+- Copyright (C) 2020 On-Line Applications Research (OAR)
+cppflags: []
+cxxflags: []
+enabled-by:
+- aarch64
+includes: []
+install:
+- destination: ${BSP_INCLUDEDIR}/libcpu
+  source:
+  - cpukit/score/cpu/aarch64/include/libcpu/vectors.h
+- destination: ${BSP_INCLUDEDIR}/rtems
+  source:
+  - cpukit/score/cpu/aarch64/include/rtems/asm.h
+- destination: ${BSP_INCLUDEDIR}/rtems/score
+  source:
+  - cpukit/score/cpu/aarch64/include/rtems/score/cpu.h
+  - cpukit/score/cpu/aarch64/include/rtems/score/cpuatomic.h
+  - cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h
+  - cpukit/score/cpu/aarch64/include/rtems/score/aarch64.h
+  - cpukit/score/cpu/aarch64/include/rtems/score/cpu_irq.h
+links: []
+source:
+- cpukit/score/cpu/aarch64/cpu.c
+- cpukit/score/cpu/aarch64/cpu_asm.S
+- cpukit/score/cpu/aarch64/aarch64-context-validate.S
+- cpukit/score/cpu/aarch64/aarch64-context-volatile-clobber.S
+- cpukit/score/cpu/aarch64/aarch64-thread-idle.c
+- cpukit/score/cpu/aarch64/aarch64-exception-default.c
+- cpukit/score/cpu/aarch64/aarch64-exception-default.S
+- cpukit/score/cpu/aarch64/aarch64-exception-interrupt.S
+- cpukit/score/cpu/aarch64/aarch64-exception-frame-print.c
+type: build

spec/build/cpukit/librtemscpu.yml

@@ -457,6 +457,8 @@ install:
   - cpukit/include/uuid/uuid.h
 install-path: ${BSP_LIBDIR}
 links:
+- role: build-dependency
+  uid: cpuaarch64
 - role: build-dependency
   uid: cpuarm
 - role: build-dependency