ARM Trusted Firmware - version 1.1
==================================
ARM Trusted Firmware provides a reference implementation of secure world
software for [ARMv8-A], including Exception Level 3 (EL3) software. This release
provides complete support for version 0.2 of the [PSCI] specification, initial
support for the new version 1.0 of that specification, and prototype support for
the Trusted Board Boot Requirements specification.
The intent is to provide a reference implementation of various ARM interface
standards, such as the Power State Coordination Interface ([PSCI]), Trusted
Board Boot Requirements (TBBR) and [Secure Monitor] [TEE-SMC] code. As far as
possible the code is designed for reuse or porting to other ARMv8-A model and
hardware platforms.
ARM will continue development in collaboration with interested parties to
provide a full reference implementation of PSCI, TBBR and Secure Monitor code
to the benefit of all developers working with ARMv8-A TrustZone technology.
License
-------
The software is provided under a BSD 3-Clause [license]. Certain source files
are derived from FreeBSD code: the original license is included in these
source files.
This Release
------------
This release is a limited functionality implementation of the Trusted Firmware.
It provides a suitable starting point for productization. Future versions will
contain new features, optimizations and quality improvements.
### Functionality
* Prototype implementation of a subset of the Trusted Board Boot Requirements
Platform Design Document (PDD). This includes packaging the various firmware
images into a Firmware Image Package (FIP) to be loaded from non-volatile
storage, and a prototype of authenticated boot using key certificates stored
in the FIP.
* Initializes the secure world (for example, exception vectors, control
registers, GIC and interrupts for the platform), before transitioning into
the normal world.
* Supports both GICv2 and GICv3 initialization for use by normal world
software.
* Starts the normal world at the Exception Level and Register Width specified
by the platform port. Typically this is AArch64 EL2 if available.
* Handles SMCs (Secure Monitor Calls) conforming to the [SMC Calling
Convention PDD] [SMCCC] using an EL3 runtime services framework.
* Handles SMCs relating to the [Power State Coordination Interface PDD] [PSCI]
for the Secondary CPU Boot, CPU Hotplug, CPU Idle and System Shutdown/Reset
use-cases.
* A Test Secure-EL1 Payload and Dispatcher to demonstrate Secure Monitor
functionality such as world switching, EL1 context management and interrupt
routing. This also demonstrates Secure-EL1 interaction with PSCI. Some of
this functionality is provided in library form for re-use by other
Secure-EL1 Payload Dispatchers.
* Support for alternative Trusted Boot Firmware. Some platforms have their own
Trusted Boot implementation and only require the Secure Monitor
functionality provided by ARM Trusted Firmware.
* Isolation of memory accessible by the secure world from the normal world
through programming of a TrustZone controller.
* Support for CPU specific reset sequences, power down sequences and register
dumping during crash reporting. The CPU specific reset sequences include
support for errata workarounds.
For a full description of functionality and implementation details, please
see the [Firmware Design] and supporting documentation. The [Change Log]
provides details of changes made since the last release.
### Platforms
This release of the Trusted Firmware has been tested on Revision B of the
[Juno ARM Development Platform] [Juno] with Version r0p0-00rel7 of the
[ARM SCP Firmware] [SCP download].
The Trusted Firmware has also been tested on the 64-bit Linux versions of the
following ARM [FVP]s:
* `Foundation_Platform` (Version 9.1, Build 9.1.33)
* `FVP_Base_AEMv8A-AEMv8A` (Version 6.2, Build 0.8.6202)
* `FVP_Base_Cortex-A57x4-A53x4` (Version 6.2, Build 0.8.6202)
* `FVP_Base_Cortex-A57x1-A53x1` (Version 6.2, Build 0.8.6202)
* `FVP_Base_Cortex-A57x2-A53x4` (Version 6.2, Build 0.8.6202)
The Foundation FVP can be downloaded free of charge. The Base FVPs can be
licensed from ARM: see [www.arm.com/fvp] [FVP].
### Still to Come
* Complete and more flexible Trusted Board Boot implementation.
* Complete implementation of the [PSCI] v1.0 specification.
* Support for alternative types of Secure-EL1 Payloads.
* Extending the GICv3 support to the secure world.
* Support for new System IP devices.
For a full list of detailed issues in the current code, please see the [Change
Log] and the [GitHub issue tracker].
Getting Started
---------------
Get the Trusted Firmware source code from
[GitHub](https://www.github.com/ARM-software/arm-trusted-firmware).
See the [User Guide] for instructions on how to install, build and use
the Trusted Firmware with the ARM [FVP]s.
See the [Firmware Design] for information on how the ARM Trusted Firmware works.
See the [Porting Guide] as well for information about how to use this
software on another ARMv8-A platform.
See the [Contributing Guidelines] for information on how to contribute to this
project and the [Acknowledgments] file for a list of contributors to the
project.
### Feedback and support
ARM welcomes any feedback on the Trusted Firmware. Please send feedback using
the [GitHub issue tracker].
ARM licensees may contact ARM directly via their partner managers.
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_Copyright (c) 2013-2015, ARM Limited and Contributors. All rights reserved._
[License]: ./license.md "BSD license for ARM Trusted Firmware"
[Contributing Guidelines]: ./contributing.md "Guidelines for contributors"
[Acknowledgments]: ./acknowledgements.md "Contributor acknowledgments"
[Change Log]: ./docs/change-log.md
[User Guide]: ./docs/user-guide.md
[Firmware Design]: ./docs/firmware-design.md
[Porting Guide]: ./docs/porting-guide.md
[ARMv8-A]: http://www.arm.com/products/processors/armv8-architecture.php "ARMv8-A Architecture"
[FVP]: http://www.arm.com/fvp "ARM's Fixed Virtual Platforms"
[Juno]: http://www.arm.com/products/tools/development-boards/versatile-express/juno-arm-development-platform.php "Juno ARM Development Platform"
[SCP download]: https://silver.arm.com/download/download.tm?pv=1764630
[PSCI]: http://infocenter.arm.com/help/topic/com.arm.doc.den0022c/DEN0022C_Power_State_Coordination_Interface.pdf "Power State Coordination Interface PDD (ARM DEN 0022C)"
[SMCCC]: http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html "SMC Calling Convention PDD (ARM DEN 0028A)"
[TEE-SMC]: http://www.arm.com/products/processors/technologies/trustzone/tee-smc.php "Secure Monitor and TEEs"
[GitHub issue tracker]: https://github.com/ARM-software/tf-issues/issues