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)

<li>
    <p>
        <a href="https://developer.arm.com/docs/den0006/latest">Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)</a>
    </p>
</li>

<li>
    <p>
        <a href="http://infocenter.arm.com/help/topic/com.arm.doc.den0028b/ARM_DEN0028B_SMC_Calling_Convention.pdf">SMC Calling Convention</a>
    </p>
</li>

<li>
    <p>
        <a href="http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/DEN0056A_System_Control_and_Management_Interface.pdf">System Control and Management Interface (SCMI)</a>
    </p>
</li>

<li>
    <p>
        <a href="http://infocenter.arm.com/help/topic/com.arm.doc.den0054a/ARM_DEN0054A_Software_Delegated_Exception_Interface.pdf">Software Delegated Exception Interface (SDEI)</a>
    </p>
</li>

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.

To find out more about Trusted Firmware-A, please view the full documentation that is available through trustedfirmware.org.

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