4e04478aac
The speculation barrier feature (`FEAT_SB`) was introduced with and made mandatory in the Armv8.5-A extension. It was retroactively made optional in prior extensions, but the checks in our code-base do not reflect that, assuming that it is only available in Armv8.5-A or later. This change introduces the `ENABLE_FEAT_SB` definition, which derives support for the `sb` instruction in the assembler from the feature flags passed to it. Note that we assume that if this feature is enabled then all the cores in the system support it - enabling speculation barriers for only a subset of the cores is unsupported. Signed-off-by: Chris Kay <chris.kay@arm.com> Change-Id: I978ed38829385b221b10ba56d49b78f4756e20ea |
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readme.rst
Trusted Firmware-A
Trusted Firmware-A (TF-A) is a reference implementation of secure world software for Arm A-Profile architectures (Armv8-A and Armv7-A), including an Exception Level 3 (EL3) Secure Monitor. It provides a suitable starting point for productization of secure world boot and runtime firmware, in either the AArch32 or AArch64 execution states.
TF-A implements Arm interface standards, including:
- Power State Coordination Interface (PSCI)
- Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)
- SMC Calling Convention
- System Control and Management Interface (SCMI)
- Software Delegated Exception Interface (SDEI)
The code is designed to be portable and reusable across hardware platforms and software models that are based on the Armv8-A and Armv7-A architectures.
In collaboration with interested parties, we will continue to enhance TF-A with reference implementations of Arm standards to benefit developers working with Armv7-A and Armv8-A TrustZone technology.
Users are encouraged to do their own security validation, including penetration testing, on any secure world code derived from TF-A.
More Info and Documentation
To find out more about Trusted Firmware-A, please view the full documentation that is available through trustedfirmware.org.
Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.