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ARM Trusted Firmware - version 1.0
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==================================
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ARM Trusted Firmware provides a reference implementation of secure world
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software for [ARMv8-A], including Exception Level 3 (EL3) software. This
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release provides initial support for the [Juno ARM Development Platform] [Juno],
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complementing the existing support for the Base and Foundation
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[Fixed Virtual Platforms (FVPs)] [FVP] from ARM.
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The intent is to provide a reference implementation of various ARM interface
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standards, such as the Power State Coordination Interface ([PSCI]), Trusted
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Board Boot Requirements (TBBR) and [Secure Monitor] [TEE-SMC] code. As far as
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possible the code is designed for reuse or porting to other ARMv8-A model and
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hardware platforms.
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ARM will continue development in collaboration with interested parties to
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provide a full reference implementation of PSCI, TBBR and Secure Monitor code
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to the benefit of all developers working with ARMv8-A TrustZone technology.
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License
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-------
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The software is provided under a BSD 3-Clause [license]. Certain source files
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are derived from FreeBSD code: the original license is included in these
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source files.
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This Release
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------------
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This release is a limited functionality implementation of the Trusted Firmware.
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It provides a suitable starting point for productization. Future versions will
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contain new features, optimizations and quality improvements.
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### Functionality
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* Initial implementation of a subset of the Trusted Board Boot Requirements
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Platform Design Document (PDD). This includes packaging the various firmware
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images into a Firmware Image Package (FIP) to be loaded from non-volatile
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storage.
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* Initializes the secure world (for example, exception vectors, control
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registers, GIC and interrupts for the platform), before transitioning into
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the normal world.
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* Supports both GICv2 and GICv3 initialization for use by normal world
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software.
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* Starts the normal world at the Exception Level and Register Width provided
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by the platform port. Typically this is AArch64 EL2 if available.
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* Handles SMCs (Secure Monitor Calls) conforming to the [SMC Calling
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Convention PDD] [SMCCC] using an EL3 runtime services framework.
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* Handles SMCs relating to the [Power State Coordination Interface PDD] [PSCI]
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for the Secondary CPU Boot, CPU Hotplug, CPU Idle and System Shutdown/Reset
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use-cases.
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* A Test Secure-EL1 Payload and Dispatcher to demonstrate Secure Monitor
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functionality such as world switching, EL1 context management and interrupt
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routing. This also demonstrates Secure-EL1 interaction with PSCI. Some of
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this functionality is provided in library form for re-use by other
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Secure-EL1 Payload Dispatchers.
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* Support for alternative Trusted Boot Firmware. Some platforms have their own
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Trusted Boot implementation and only require the Secure Monitor
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functionality provided by ARM Trusted Firmware.
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* Isolation of memory accessible by the secure world from the normal world
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through programming of a TrustZone controller.
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* Support for CPU specific reset sequences, power down sequences and register
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dumping during crash reporting. The CPU specific reset sequences include
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support for errata workarounds.
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For a full description of functionality and implementation details, please
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see the [Firmware Design] and supporting documentation. The [Change Log]
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provides details of changes made since the last release.
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### Platforms
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This release of the Trusted Firmware has been tested on Revision B of the
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[Juno ARM Development Platform] [Juno] with Version r0p0-00rel7 of the
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[ARM SCP Firmware] [SCP download].
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The Trusted Firmware has also been tested on the 64-bit Linux versions of the
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following ARM [FVP]s:
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* `Foundation_v8` (Version 2.1, Build 9.0.24)
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* `FVP_Base_AEMv8A-AEMv8A` (Version 5.8, Build 0.8.5802)
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* `FVP_Base_Cortex-A57x4-A53x4` (Version 5.8, Build 0.8.5802)
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* `FVP_Base_Cortex-A57x1-A53x1` (Version 5.8, Build 0.8.5802)
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* `FVP_Base_Cortex-A57x2-A53x4` (Version 5.8, Build 0.8.5802)
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The Foundation FVP can be downloaded free of charge. The Base FVPs can be
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licensed from ARM: see [www.arm.com/fvp] [FVP].
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### Still to Come
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* Complete Trusted Boot implementation.
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* Complete implementation of the [PSCI] specification.
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* Support for alternative types of Secure-EL1 Payloads.
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* Completing the currently experimental GICv3 support.
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* Support for new System IP devices.
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For a full list of detailed issues in the current code, please see the [Change
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Log] and the [GitHub issue tracker].
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Getting Started
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---------------
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Get the Trusted Firmware source code from
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[GitHub](https://www.github.com/ARM-software/arm-trusted-firmware).
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See the [User Guide] for instructions on how to install, build and use
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the Trusted Firmware with the ARM [FVP]s.
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See the [Firmware Design] for information on how the ARM Trusted Firmware works.
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See the [Porting Guide] as well for information about how to use this
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software on another ARMv8-A platform.
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See the [Contributing Guidelines] for information on how to contribute to this
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project and the [Acknowledgments] file for a list of contributors to the
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project.
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### Feedback and support
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ARM welcomes any feedback on the Trusted Firmware. Please send feedback using
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the [GitHub issue tracker].
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ARM licensees may contact ARM directly via their partner managers.
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- - - - - - - - - - - - - - - - - - - - - - - - - -
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_Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved._
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[License]: ./license.md "BSD license for ARM Trusted Firmware"
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[Contributing Guidelines]: ./contributing.md "Guidelines for contributors"
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[Acknowledgments]: ./acknowledgements.md "Contributor acknowledgments"
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[Change Log]: ./docs/change-log.md
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[User Guide]: ./docs/user-guide.md
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[Firmware Design]: ./docs/firmware-design.md
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[Porting Guide]: ./docs/porting-guide.md
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[ARMv8-A]: http://www.arm.com/products/processors/armv8-architecture.php "ARMv8-A Architecture"
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[FVP]: http://www.arm.com/fvp "ARM's Fixed Virtual Platforms"
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[Juno]: http://www.arm.com/products/tools/development-boards/versatile-express/juno-arm-development-platform.php "Juno ARM Development Platform"
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[SCP download]: https://silver.arm.com/download/download.tm?pv=1764630
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[PSCI]: http://infocenter.arm.com/help/topic/com.arm.doc.den0022b/index.html "Power State Coordination Interface PDD (ARM DEN 0022B.b)"
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[SMCCC]: http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html "SMC Calling Convention PDD (ARM DEN 0028A)"
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[TEE-SMC]: http://www.arm.com/products/processors/technologies/trustzone/tee-smc.php "Secure Monitor and TEEs"
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[GitHub issue tracker]: https://github.com/ARM-software/tf-issues/issues
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