Server Base System Architecture - Architecture Compliance Suite

Server Base System Architecture

Server Base System Architecture (SBSA) specification specifies a hardware system architecture based on the Arm 64-bit architecture. Server system software such as operating systems, hypervisors, and firmware rely on this. It addresses processing element features and key aspects of system architecture.

For more information, download the SBSA specification

SBSA - Architecture Compliance Suite

SBSA Architecture Compliance Suite (ACS) is a collection of self-checking, portable C-based tests. This suite includes a set of examples of the invariant behaviors that are provided by the SBSA specification, so that implementers can verify if these behaviours have been interpreted correctly. Most of the tests are executed from UEFI Shell by executing the SBSA UEFI shell application. A few tests are executed by running the SBSA ACS Linux application which in turn depends on the SBSA ACS Linux kernel module.

Release details

• Code Quality: REL v2.4
• The tests are written for version 5.0 of the SBSA specification.
• PCIe RCiEP tests for Appendix E of SBSA 6.0 specification are also included.
• The compliance suite is not a substitute for design verification.
• To review the SBSA ACS logs, Arm licensees can contact Arm directly through their partner managers.
• To know about the gaps in the test coverage, see Testcase checklist.

GitHub branch

• To pick up the release version of the code, checkout the release branch.
• To get the latest version of the code with bug fixes and new features, use the master branch.

Additional reading

• For details on the SBSA ACS UEFI Shell Application, see SBSA ACS User Guide.
• For details on the Design of the SBSA ACS, see Validation Methodology Document.
• For information about the test coverage scenarios that are implemented in the current release of ACS and the scenarios that are planned for the future releases, see Testcase checklist.

SBSA ACS Linux kernel module

To enable the export of a few kernel APIs that are necessary for PCIe and IOMMU tests, Linux kernel module and a kernel patch file are required. These files are available at linux-arm.org/git.

Target platforms

Any AARCH64 Enterprise Platform that boots UEFI and Linux OS.

ACS build steps - UEFI Shell application

Prebuilt images

Prebuilt images for each release are available in the prebuilt_images folder of the release branch. You can choose to use these images or build your own image by following the steps below. If you choose to use the prebuilt image, please jump to the test suite execution section below for details on how to run the application.

Prerequisites

Before starting the ACS build, ensure that the following requirements are met.

• Any mainstream Linux based OS distribution running on a x86 or aarch64 machine.
• git clone the UDK2018 branch of EDK2 tree.
• Install GCC 5.3 or later toolchain for Linux from here.
• Install the build prerequisite packages to build EDK2. Note: The details of the packages are beyond the scope of this document.

To start the ACS build, perform the following steps:

1. cd local_edk2_path
2. git clone https://github.com/ARM-software/sbsa-acs AppPkg/Applications/sbsa-acs
3. Add the following to the [LibraryClasses.common] section in ShellPkg/ShellPkg.dsc

• Add SbsaValLib|AppPkg/Applications/sbsa-acs/val/SbsaValLib.inf
• Add SbsaPalLib|AppPkg/Applications/sbsa-acs/platform/pal_uefi/SbsaPalLib.inf

4. Add AppPkg/Applications/sbsa-acs/uefi_app/SbsaAvs.inf in the [components] section of ShellPkg/ShellPkg.dsc

Linux build environment

If the build environment is Linux, perform the following steps:

1. export GCC49_AARCH64_PREFIX= GCC5.3 toolchain path pointing to /bin/aarch64-linux-gnu- in case of x86 machine. For aarch64 build it should point to /usr/bin/
2. source edksetup.sh
3. make -C BaseTools/Source/C
4. source AppPkg/Applications/sbsa-acs/tools/scripts/avsbuild.sh

Windows build environment

If the build environment is Windows, perform the following steps:

1. Set the toolchain path to GCC53 or above.
2. Setup the environment for AARCH64 EDK2 build.
3. Build the SBSA shell application. For example, build -a AARCH64 -t GCC49 -p ShellPkg/ShellPkg.dsc -m AppPkg/Applications/sbsa-acs/uefi_app/SbsaAvs.inf

Note: To build the ACS with NIST Statistical Test Suite, see SBSA_NIST_User_Guide

Build output

The EFI executable file is generated at <edk2_path>/Build/Shell/DEBUG_GCC49/AARCH64/Sbsa.efi

Test suite execution

The execution of the compliance suite varies depending on the test environment. These steps assume that the test suite is invoked through the ACS UEFI shell application.

For details about the SBSA ACS UEFI Shell application, see SBSA ACS USER Guide

Post-Silicon

On a system where a USB port is available and functional, perform the following steps:

1. Copy 'Sbsa.efi' to a USB Flash drive.
2. Plug in the USB Flash drive to one of the functional USB ports on the system.
3. Boot the system to UEFI shell.
4. To determine the file system number of the plugged in USB drive, execute 'map -r' command.
5. Type 'fsx' where 'x' is replaced by the number determined in step 4.
6. To start the compliance tests, run the executable Sbsa.efi with the appropriate parameters. For details on the parameters, refer to SBSA ACS User Guide
7. Copy the UART console output to a log file for analysis and certification.

Emulation environment with secondary storage

On an emulation environment with secondary storage, perform the following steps:

1. Create an image file which contains the 'Sbsa.efi' file. For Example:

• mkfs.vfat -C -n HD0 hda.img 2097152
• sudo mount -o rw,loop=/dev/loop0,uid=whoami,gid=whoami hda.img /mnt/sbsa
• cp "/Sbsa.efi" /mnt/sbsa/
• sudo umount /mnt/sbsa

2. Load the image file to the secondary storage using a backdoor. The steps followed to load the image file are Emulation environment specific and beyond the scope of this document.
3. Boot the system to UEFI shell.
4. To determine the file system number of the secondary storage, execute 'map -r' command.
5. Type 'fsx' where 'x' is replaced by the number determined in step 4.
6. To start the compliance tests, run the executable Sbsa.efi with the appropriate parameters. For details on the parameters, see SBSA ACS User Guide
7. Copy the UART console output to a log file for analysis and certification.

Emulation environment without secondary storage

On an Emulation platform where secondary storage is not available, perform the following steps:

1. Add the path to 'Sbsa.efi' file in the UEFI FD file.
2. Build UEFI image including the UEFI Shell.
3. Boot the system to UEFI shell.
4. Run the executable 'Sbsa.efi' to start the compliance tests. For details about the parameters, see SBSA ACS User Guide.
5. Copy the UART console output to a log file for analysis and certification.

Linux OS-based tests

Certain PCIe and IOMMU tests require Linux operating system with kernel version 4.10 or above. The procedure to build and run these tests is described in SBSA ACS User Guide.

Security implication

Arm Enterprise ACS test suite may run at higher privilege level. An attacker may utilize these tests as a means to elevate privilege which can potentially reveal the platform security assets. To prevent the leakage of secure information, it is strongly recommended that the ACS test suite is run only on development platforms. If it is run on production systems, the system should be scrubbed after running the test suite.

License

SBSA ACS is distributed under Apache v2.0 License.

Feedback, contributions and support

• For feedback, use the GitHub Issue Tracker that is associated with this repository.
• For support, please send an email to "support-enterprise-acs@arm.com" with details.
• Arm licensees may contact Arm directly through their partner managers.
• Arm welcomes code contributions through GitHub pull requests. See GitHub documentation on how to raise pull requests.

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