OS tier levels + AutoSD as a community OS

.github/CODEOWNERS

@@ -32,6 +32,8 @@ verification/                         @eclipse-score/automotive-score-committers
 /docs/introduction/                   @eclipse-score/automotive-score-committers
 /docs/manuals/                        @eclipse-score/automotive-score-committers
 /docs/modules/                        @eclipse-score/automotive-score-committers
+# TLs are intermediate until representatives have been finalized
+/docs/modules/os/operating_systems    @antonkri @FScholPer @qor-lb @johannes-esr
 # /docs/platform_management_plan/     @eclipse-score/community-process
 /docs/platform_management_plan/       @pahmann @masc2023 @aschemmel-tech @PandaeDo
 # /docs/quality/                      @eclipse-score/quality-managers

docs/modules/os/docs/index.rst

@@ -22,7 +22,7 @@
 
 .. mod_view_sta:: OS (external)
    :id: mod_view_sta__os__os
-   :includes: comp__os_libc, comp__os_message_passing, comp__os_libcpp
+   :includes: comp__os_libc, comp__os_message_passing, comp__os_libcpp, comp__os_autosd
    :belongs_to: mod__os
 
    The module "OS" is not a part of the S-CORE SW-Platform, but it is a crucial external SW element.

docs/modules/os/operating_systems/docs/certifiable/index.rst

@@ -0,0 +1,25 @@
+..
+   # *******************************************************************************
+   # Copyright (c) 2025 Contributors to the Eclipse Foundation
+   #
+   # See the NOTICE file(s) distributed with this work for additional
+   # information regarding copyright ownership.
+   #
+   # This program and the accompanying materials are made available under the
+   # terms of the Apache License Version 2.0 which is available at
+   # https://www.apache.org/licenses/LICENSE-2.0
+   #
+   # SPDX-License-Identifier: Apache-2.0
+   # *******************************************************************************
+
+.. _comp_doc_os_certifiable:
+
+Certifiable Level
+#################
+
+These are the certifiable-supported Operating Systems for Eclipse S-CORE.
+
+See see :ref:`platform_assumptions` for the exact requirements for each level (Tier).
+
+
+

docs/modules/os/operating_systems/docs/community/autosd.rst

@@ -0,0 +1,188 @@
+..
+   # *******************************************************************************
+   # Copyright (c) 2025 Contributors to the Eclipse Foundation
+   #
+   # See the NOTICE file(s) distributed with this work for additional
+   # information regarding copyright ownership.
+   #
+   # This program and the accompanying materials are made available under the
+   # terms of the Apache License Version 2.0 which is available at
+   # https://www.apache.org/licenses/LICENSE-2.0
+   #
+   # SPDX-License-Identifier: Apache-2.0
+   # *******************************************************************************
+
+.. comp:: AutoSD
+   :id: comp__os_autosd
+   :security: YES
+   :safety: QM
+   :status: valid
+   :implements: aou_req__platform__integration_assistance, aou_req__platform__os_integration_manual, aou_req__platform__bug_interface
+
+AutoSD
+######
+
+AutoSD is the upstream binary distribution that serves as the public, in-development preview and functional precursor
+of the Red Hat In-Vehicle Operating System (OS).
+
+AutoSD is downstream of CentOS Stream, so it retains most of the CentOS Stream code with a few divergences,
+such as an optimized automotive-specific kernel rather than CentOS Stream's kernel package.
+
+Red Hat In-Vehicle OS is based on both AutoSD and RHEL, both of which are downstreams of CentOS Stream.
+
+OS Maintainers/Integration Assistance
+-----------------------------------------
+
+GitHub Handles of the target maintainers.
+
+- Leonardo Rossetti - @odra
+
+Integration Assistance
+----------------------
+
+The following fulfills :need:`aou_req__platform__integration_assistance`
+
++----------------+-----------------------------+
+| .. centered:: Leonardo Rossetti              |
++----------------+-----------------------------+
+| Github Handler | @odra                       |
++----------------+-----------------------------+
+| Slack Handler  | @lrossett                   |
++----------------+-----------------------------+
+
+
+Integration Manual
+------------------
+
+The following fulfills :need:`aou_req__platform__os_integration_manual`
+
+
+Supported Architectures
+^^^^^^^^^^^^^^^^^^^^^^^
+
++----------------------+----------------------------+
+| Target Architecture  | Comments                   |
++----------------------+----------------------------+
+| x86_64               | Native Only                |
++----------------------+----------------------------+
+| aarch64              | Native Only                |
++----------------------+----------------------------+
+
+
+Build Instructions
+^^^^^^^^^^^^^^^^^^
+
+Building an AutoSD image can be done by using `aib <https://gitlab.com/CentOS/automotive/src/automotive-image-builder>`_.
+
+Sample usage:
+
+.. code:: bash
+
+   export OCI_IMAGE=localhost/score:latest
+   export AIB_DISTRO=autosd10-sig 
+
+   aib build-builder --distro ${AIB_DISTRO}
+   aib build --target qemu --distro ${AIB_DISTRO} image.aib.yml ${OCI_IMAGE}
+   aib to-disk-image ${OCI_IMAGE} autosd-score.qcow2
+
+As an alternative, you can replace the bare metal "aib" usage with a bash script that runs the tool inside an OCI container:
+
+.. code:: bash
+
+    curl -o auto-image-builder.sh "https://gitlab.com/CentOS/automotive/src/automotive-image-builder/-/raw/main/auto-image-builder.sh"
+    chmod +x auto-image-builder.sh
+
+You can then replace the usage of "aib" with "auto-image-builder.sh" (requires sudo):
+
+.. code:: bash
+
+   export OCI_IMAGE=localhost/score:latest
+   export AIB_DISTRO=autosd10-sig 
+   # set the container storage to the local "_builder" directory to avoid permissions issues
+   export AIB_LOCAL_CONTAINER_STORAGE=$PWD/_build/containers-storage
+
+   sudo -E ./auto-image-builder.sh build-builder --distro ${AIB_DISTRO}
+   sudo -E ./auto-image-builder.sh build --target qemu --distro ${AIB_DISTRO} image.aib.yml ${OCI_IMAGE}
+   sudo -E ./auto-image-builder.sh to-disk-image ${OCI_IMAGE} autosd-score.qcow2
+
+If using QEMU, you can run the image using the following command:
+
+.. code:: bash
+
+   /usr/bin/qemu-system-x86_64 \
+   -drive file=/usr/share/OVMF/OVMF_CODE_4M.fd,if=pflash,format=raw,unit=0,readonly=on \
+   -drive file=/usr/share/OVMF/OVMF_VARS_4M.fd,if=pflash,format=raw,unit=1,snapshot=on,readonly=off \
+   -enable-kvm \
+   -m 2G \
+   -smp $(nproc) \
+   -machine q35 \
+   -cpu host \
+   -device virtio-net-pci,netdev=n0 \
+   -netdev user,id=n0,hostfwd=tcp::2222-:22 \
+   -daemonize \
+   -display none \
+   -drive file=disk.qcow2,index=0,media=disk,format=qcow2,if=virtio,id=rootdisk,snapshot=off
+
+Toolchain
+^^^^^^^^^
+
+Refer to the `upstream toolchiain repository <https://github.com/eclipse-score/inc_os_autosd/tree/main/toolchain>`_ for detailed instructions.
+
+A Bazel toolchain defintion is provided for users to build their Bazel modules and components with AutoSD's tooling (compilers, libraries, etc).
+
+Sample usage (MODULE.bazel file):
+
+.. code:: starlark
+
+   # Use local path during development, or git_override for published versions
+   local_path_override(
+       module_name = "os_autosd",
+       path = "/path/to/inc_os_autosd/"
+   )
+
+   bazel_dep(name = "os_autosd", version = "1.0.0")
+
+   # Configure AutoSD 9 GCC toolchain
+   autosd_10_gcc = use_extension("@os_autosd//toolchain/autosd_10_gcc:extensions.bzl", "autosd_10_gcc_extension")
+   autosd_10_gcc.configure(
+       c_flags = ["-Wall", "-Wno-error=deprecated-declarations", "-Werror", "-fPIC"],
+       cxx_flags = ["-Wall", "-Wno-error=deprecated-declarations", "-Werror", "-fPIC"],
+   )
+
+   use_repo(autosd_10_gcc, "autosd_10_gcc_repo")
+   register_toolchains("@autosd_10_gcc_repo//:gcc_toolchain_linux_x86_64")
+
+**NOTE:** AutoSD's tooling does not support cross compilation.
+
+Mixed Critical Orchestration
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Refer to the `upstream CentOS automotive documentation <https://sigs.centos.org/automotive/features-and-concepts/con_mixed-criticality/>`_ for detailed information.
+
+Mixed Critical Orchestration, aka MCO, can be achieved with the following components:
+
+* Systemd: the init system that is responsible for workload orchestration
+* Eclise BlueChi: extends Systemd to enable multi-node and multi domain orchestration
+* QM: Quality management environment that is composed of two sub-systems: a dedicated rootfs partition + container isolation
+
+ASIL and QM connectivity is done either via an IPC socket or shared memory (/dev/shm).
+
+.. image:: _assets/autosd-mco.png
+   :align: center
+
+Bug Interface
+-------------
+
+The following fulfills :need:`aou_req__platform__bug_interface`
+
++------------------------------------+---------------------------------------------------------------------------+
+|                                                                                                                |
++------------------------------------+---------------------------------------------------------------------------+
+| CentOS SIG Automotive Mailing List | https://lists.centos.org/hyperkitty/list/automotive-sig@lists.centos.org/ |
++------------------------------------+---------------------------------------------------------------------------+
+| Gitlab Issue Tracker               | https://gitlab.com/CentOS/automotive/sig                                  |
++------------------------------------+---------------------------------------------------------------------------+
+| CentOS SIG Matrix Channel          | https://app.element.io/#/room/#centos-automotive-sig:fedoraproject.org    |
++------------------------------------+---------------------------------------------------------------------------+
+| Eclipse SDV Slack Channel          | #autosd (https://sdvworkinggroup.slack.com/archives/C0986LJ9EJH)          |
++------------------------------------+---------------------------------------------------------------------------+

docs/modules/os/operating_systems/docs/community/index.rst

@@ -0,0 +1,27 @@
+..
+   # *******************************************************************************
+   # Copyright (c) 2025 Contributors to the Eclipse Foundation
+   #
+   # See the NOTICE file(s) distributed with this work for additional
+   # information regarding copyright ownership.
+   #
+   # This program and the accompanying materials are made available under the
+   # terms of the Apache License Version 2.0 which is available at
+   # https://www.apache.org/licenses/LICENSE-2.0
+   #
+   # SPDX-License-Identifier: Apache-2.0
+   # *******************************************************************************
+
+.. _comp_doc_os_community:
+
+Community Level
+###############
+
+.. toctree::
+   :titlesonly:
+
+   autosd.rst
+
+These are the community-supported Operating Systems for Eclipse S-CORE.
+
+See see :ref:`platform_assumptions` for the exact requirements for each level (Tier).

docs/modules/os/operating_systems/docs/functional/index.rst

@@ -0,0 +1,22 @@
+..
+   # *******************************************************************************
+   # Copyright (c) 2025 Contributors to the Eclipse Foundation
+   #
+   # See the NOTICE file(s) distributed with this work for additional
+   # information regarding copyright ownership.
+   #
+   # This program and the accompanying materials are made available under the
+   # terms of the Apache License Version 2.0 which is available at
+   # https://www.apache.org/licenses/LICENSE-2.0
+   #
+   # SPDX-License-Identifier: Apache-2.0
+   # *******************************************************************************
+
+.. _comp_doc_os_functional:
+
+Functional Level
+################
+
+These are the functional-supported Operating Systems for Eclipse S-CORE.
+
+See see :ref:`platform_assumptions` for the exact requirements for each level (Tier).

docs/modules/os/operating_systems/docs/index.rst

@@ -0,0 +1,65 @@
+..
+   # *******************************************************************************
+   # Copyright (c) 2025 Contributors to the Eclipse Foundation
+   #
+   # See the NOTICE file(s) distributed with this work for additional
+   # information regarding copyright ownership.
+   #
+   # This program and the accompanying materials are made available under the
+   # terms of the Apache License Version 2.0 which is available at
+   # https://www.apache.org/licenses/LICENSE-2.0
+   #
+   # SPDX-License-Identifier: Apache-2.0
+   # *******************************************************************************
+
+.. _comp_doc_os:
+
+Operating Systems
+=================
+
+.. toctree::
+   :maxdepth: 2
+   :hidden:
+
+   onboarding/index
+   community/index
+   functional/index
+   certifiable/index
+
+An operating system is an environment on which S-CORE is integrated and executed.
+
+In the context of the OS module, **S-CORE acts as the operaring system integrator**:
+S-CORE maintainers integrate and validate specific OS environments as S-CORE
+reference operating systems and document the practical usage for downstream users.
+
+Operating Systems are categorized into the following **levels**:
+
+* **Community Level**: integrated on a best-effort basis. S-CORE provides **no guarantees**
+  that the operating system builds or runs reliably.
+* **Functional Level**: S-CORE provides **functional guarantees** (build + tests for the
+  reference integration).
+* **Certifiable Level**: S-CORE provides **certifiability-oriented guarantees** for the
+  reference integration and documents additional safety/security expectations.
+
+The concrete level requirements are defined in :ref:`platform_assumptions`.
+
+Roles and Responsibilities
+--------------------------
+
+Operating system integrations follow the process requirements defined in:
+:ref:`platform_assumptions`.
+
+Two roles from the process requirements are relevant:
+
+* **Supplier**: provides an external SW element (e.g. OS / hypervisor) that S-CORE uses.
+* **System Integrator**: integrates the S-CORE operring system into a system.
+
+In the S-CORE Software Platforms, these roles map to:
+
+* **OS Maintainer** (Supplier role): resolves the *supplier* requirements.
+  The OS maintainer provides the prerequisites so that the OS can be considered
+  for promotion to a level.
+
+* **S-CORE** (System Integrator role): resolves the *system integrator* requirements.
+  Once S-CORE accepts an OS at **Functional** or **Certifiable** level, S-CORE
+  must ensure that the accepted guarantees remain valid across all increments.