Add experimental CI using Kas+GitLab

Add kas scripts that generic to test builds, and a GitLab CI runner.

This is mainly a cut-down copy of what is in the master/gatesgarth
branches with the following changes:

- Just the BSPs that are in the Dunfell release, obviously
- No clang testing. There are patches in master that can be backported
  if required.
- Added testing of the armgcc-9.2 compiler. This is currently broken for
  some configurations in master and the testing will be forward-ported
  when it passes.

Change-Id: I9c2a4f66318b3ccc066d423f3533202ee33f0c9d
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

kas/a5ds.yml

@@ -0,0 +1,6 @@
+header:
+  version: 9
+  includes:
+    - base.yml
+
+machine: a5ds

kas/armgcc.yml

@@ -0,0 +1,6 @@
+header:
+  version: 9
+
+local_conf_header:
+  libc: |
+    GCCVERSION = "arm-9.2"

kas/base.yml

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+header:
+  version: 9
+
+distro: poky
+
+defaults:
+  repos:
+    refspec: dunfell
+
+repos:
+  meta-arm:
+    layers:
+      meta-arm:
+      meta-arm-bsp:
+      meta-arm-toolchain:
+
+  poky:
+    url: https://git.yoctoproject.org/git/poky
+    layers:
+      meta:
+      meta-poky:
+
+  meta-openembedded:
+    url: https://git.openembedded.org/meta-openembedded
+    layers:
+      meta-oe:
+
+  meta-kernel:
+    url: https://gitlab.com/openembedded/community/meta-kernel.git
+
+local_conf_header:
+  base: |
+    CONF_VERSION = "1"
+    PACKAGE_CLASSES = "package_ipk"
+    LICENSE_FLAGS_WHITELIST += "armcompiler"
+    PACKAGECONFIG_remove_pn-qemu-system-native = "gtk+ sdl"
+    BB_NUMBER_THREADS = "16"
+    PARALLEL_MAKE = "-j16"
+    INHERIT += "rm_work"
+    ERROR_QA = "${WARN_QA}"
+  ptest: |
+    DISTRO_FEATURES_remove = "ptest"
+
+machine: unset
+
+target:
+  - core-image-base
+#  - perf

kas/check-machine-coverage

@@ -0,0 +1,26 @@
+#! /usr/bin/env python3
+
+from pathlib import Path
+import sys
+
+metaarm = Path.cwd()
+
+if metaarm.name != "meta-arm":
+    print("Not running inside meta-arm")
+    sys.exit(1)
+
+# All machine configurations
+machines = metaarm.glob("meta-*/conf/machine/*.conf")
+machines = set(p.stem for p in machines)
+
+# All kas files
+kas = metaarm.glob("kas/*.yml")
+kas = set(p.stem for p in kas)
+
+missing = machines - kas
+print(f"The following machines are missing: {', '.join(sorted(missing))}.")
+
+covered = len(machines) - len(missing)
+total = len(machines)
+percent = int(covered / total * 100)
+print(f"Coverage: {percent}%")

kas/clang.yml

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+header:
+  version: 9
+
+repos:
+  meta-clang:
+    url: https://github.com/kraj/meta-clang
+
+local_conf_header:
+  clang: |
+    TOOLCHAIN = "clang"

kas/foundation-armv8.yml

@@ -0,0 +1,6 @@
+header:
+  version: 9
+  includes:
+    - base.yml
+
+machine: foundation-armv8

kas/fvp-base.yml

@@ -0,0 +1,7 @@
+header:
+  version: 9
+  includes:
+    - base.yml
+
+machine: fvp-base
+

kas/gem5-arm64.yml

@@ -0,0 +1,10 @@
+header:
+  version: 9
+  includes:
+    - base.yml
+
+machine: gem5-arm64
+
+target:
+  - core-image-minimal
+  - gem5-aarch64-native

kas/jobs-to-kas

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+#! /bin/bash
+
+# Read a GitLab CI job name on $1 and transform it to a
+# list of Kas yaml files
+
+set -e -u
+
+# Read Job namne from $1 and split on /
+IFS=/ read -r -a PARTS<<<$1
+
+# Prefix each part with kas/
+PARTS=("${PARTS[@]/#/kas/}")
+
+# Suffix each part with .yml
+PARTS=("${PARTS[@]/%/.yml}")
+
+# Print colon-separated
+IFS=":"
+echo "${PARTS[*]}"

kas/juno.yml

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+header:
+  version: 9
+  includes:
+    - base.yml
+
+machine: juno

kas/musl.yml

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+header:
+  version: 9
+
+local_conf_header:
+  libc: |
+    TCLIBC = "musl"

kas/n1sdp.yml

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+header:
+  version: 9
+  includes:
+    - base.yml
+
+machine: n1sdp

kas/tc0.yml

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+header:
+  version: 9
+  includes:
+    - base.yml
+
+machine: tc0