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154 lines
6.0 KiB
154 lines
6.0 KiB
Feature Overview
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================
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This page provides an overview of the current |TF-A| feature set. For a full
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description of these features and their implementation details, please see
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the documents that are part of the *Components* and *System Design* chapters.
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The :ref:`Change Log & Release Notes` provides details of changes made since the
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last release.
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Current features
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----------------
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- Initialization of the secure world, for example exception vectors, control
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registers and interrupts for the platform.
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- Library support for CPU specific reset and power down sequences. This
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includes support for errata workarounds and the latest Arm DynamIQ CPUs.
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- Drivers to enable standard initialization of Arm System IP, for example
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Generic Interrupt Controller (GIC), Cache Coherent Interconnect (CCI),
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Cache Coherent Network (CCN), Network Interconnect (NIC) and TrustZone
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Controller (TZC).
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- Secure Monitor library code such as world switching, EL2/EL1 context
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management and interrupt routing.
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- SMC (Secure Monitor Call) handling, conforming to the `SMC Calling
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Convention`_ using an EL3 runtime services framework.
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- |PSCI| library support for CPU, cluster and system power management
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use-cases.
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This library is pre-integrated with the AArch64 EL3 Runtime Software, and
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is also suitable for integration with other AArch32 EL3 Runtime Software,
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for example an AArch32 Secure OS.
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- A generic |SCMI| driver to interface with conforming power controllers, for
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example the Arm System Control Processor (SCP).
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- A minimal AArch32 Secure Payload (*SP_MIN*) to demonstrate |PSCI| library
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integration with AArch32 EL3 Runtime Software.
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- Secure partition manager dispatcher(SPMD) with following two configurations:
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- S-EL2 SPMC implementation, widely compliant with FF-A v1.1 EAC0 and initial
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support of FF-A v1.2.
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- EL3 SPMC implementation, compliant with a subset of FF-A v1.1 EAC0.
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- Support for Arm CCA based on FEAT_RME which supports authenticated boot and
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execution of RMM with the necessary routing of RMI commands as specified in
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RMM Beta 0 Specification.
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- A Test SP and SPD to demonstrate AArch64 Secure Monitor functionality and SP
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interaction with PSCI.
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- SPDs for the `OP-TEE Secure OS`_, `NVIDIA Trusted Little Kernel`_,
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`Trusty Secure OS`_ and `ProvenCore Secure OS`_.
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- A Trusted Board Boot implementation, conforming to all mandatory TBBR
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requirements. This includes image authentication, Firmware recovery,
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Firmware encryption and packaging of the various firmware images into a
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Firmware Image Package (FIP).
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- Measured boot support with PoC to showcase its interaction with firmware TPM
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(fTPM) service implemneted on top of OP-TEE.
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- Support for Dynamic Root of Trust for Measurement (DRTM).
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- Following firmware update mechanisms available:
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- PSA Firmware Update (PSA FWU)
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- TBBR Firmware Update (TBBR FWU)
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- Reliability, Availability, and Serviceability (RAS) functionality, including
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- A Secure Partition Manager (SPM) to manage Secure Partitions in
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Secure-EL0, which can be used to implement simple management and
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security services.
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- An |SDEI| dispatcher to route interrupt-based |SDEI| events.
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- An Exception Handling Framework (EHF) that allows dispatching of EL3
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interrupts to their registered handlers, to facilitate firmware-first
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error handling.
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- A dynamic configuration framework that enables each of the firmware images
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to be configured at runtime if required by the platform. It also enables
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loading of a hardware configuration (for example, a kernel device tree)
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as part of the FIP, to be passed through the firmware stages.
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This feature is now incorporated inside the firmware configuration framework
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(fconf).
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- Support for alternative boot flows, for example to support platforms where
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the EL3 Runtime Software is loaded using other firmware or a separate
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secure system processor, or where a non-TF-A ROM expects BL2 to be loaded
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at EL3.
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- Support for Errata management firmware interface.
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- Support for the GCC, LLVM and Arm Compiler 6 toolchains.
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- Support for combining several libraries into a "romlib" image that may be
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shared across images to reduce memory footprint. The romlib image is stored
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in ROM but is accessed through a jump-table that may be stored
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in read-write memory, allowing for the library code to be patched.
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- Position-Independent Executable (PIE) support.
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Experimental features
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---------------------
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A feature is considered experimental when still in development or isn't known
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to the TF-A team as widely deployed or proven on end products. It is generally
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advised such options aren't pulled into real deployments, or done with the
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appropriate level of supplementary integration testing.
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A feature is no longer considered experimental when it is generally agreed
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the said feature has reached a level of maturity and quality comparable to
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other features that have been integrated into products.
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Experimental build options are found in following section
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:ref:`build_options_experimental`. Their use through the build emits a warning
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message.
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Additionally the following libraries are marked experimental when included
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in a platform:
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- MPU translation library ``lib/xlat_mpu``
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- RSS comms driver ``drivers/arm/rss``
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Still to come
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-------------
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- Support for additional platforms.
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- Documentation enhancements.
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- Ongoing support for new architectural features, CPUs and System IP.
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- Ongoing support for new Arm system architecture specifications.
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- Ongoing security hardening, optimization and quality improvements.
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.. _SMC Calling Convention: https://developer.arm.com/docs/den0028/latest
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.. _OP-TEE Secure OS: https://github.com/OP-TEE/optee_os
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.. _NVIDIA Trusted Little Kernel: http://nv-tegra.nvidia.com/gitweb/?p=3rdparty/ote_partner/tlk.git;a=summary
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.. _Trusty Secure OS: https://source.android.com/security/trusty
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.. _ProvenCore Secure OS: https://provenrun.com/products/provencore/
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--------------
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*Copyright (c) 2019-2023, Arm Limited. All rights reserved.*
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