18cc36aecSPaul BeesleyTrusted Firmware-A 28cc36aecSPaul Beesley================== 36f625747SDouglas Raillard 476cf653bSPaul BeesleyTrusted Firmware-A (TF-A) is a reference implementation of secure world software 576cf653bSPaul Beesleyfor `Arm A-Profile architectures`_ (Armv8-A and Armv7-A), including an Exception 676cf653bSPaul BeesleyLevel 3 (EL3) `Secure Monitor`_. It provides a suitable starting point for 776cf653bSPaul Beesleyproductization of secure world boot and runtime firmware, in either the AArch32 876cf653bSPaul Beesleyor AArch64 execution states. 90668dd71SJohn Tsichritzis 1076cf653bSPaul BeesleyTF-A implements Arm interface standards, including: 110668dd71SJohn Tsichritzis 128cc36aecSPaul Beesley- `Power State Coordination Interface (PSCI)`_ 13c1491ebaSSandrine Bailleux- `Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)`_ 144bf3349bSDan Handley- `SMC Calling Convention`_ 153c6261bdSPaul Beesley- `System Control and Management Interface (SCMI)`_ 165b0b7276SDan Handley- `Software Delegated Exception Interface (SDEI)`_ 174bf3349bSDan Handley 188cc36aecSPaul BeesleyThe code is designed to be portable and reusable across hardware platforms and 198cc36aecSPaul Beesleysoftware models that are based on the Armv8-A and Armv7-A architectures. 206f625747SDouglas Raillard 2176cf653bSPaul BeesleyIn collaboration with interested parties, we will continue to enhance TF-A 228cc36aecSPaul Beesleywith reference implementations of Arm standards to benefit developers working 238cc36aecSPaul Beesleywith Armv7-A and Armv8-A TrustZone technology. 24ca7145c5SPaul Beesley 25ca7145c5SPaul BeesleyUsers are encouraged to do their own security validation, including penetration 26ca7145c5SPaul Beesleytesting, on any secure world code derived from TF-A. 27ca7145c5SPaul Beesley 2876cf653bSPaul BeesleyMore Info and Documentation 2976cf653bSPaul Beesley--------------------------- 306f625747SDouglas Raillard 318cc36aecSPaul BeesleyTo find out more about Trusted Firmware-A, please `view the full documentation`_ 328cc36aecSPaul Beesleythat is available through `trustedfirmware.org`_. 33d0f9809dSJoel Hutton 346f625747SDouglas Raillard-------------- 356f625747SDouglas Raillard 36*2159138cSManish V Badarkhe*Copyright (c) 2013-2025, Arm Limited and Contributors. All rights reserved.* 376f625747SDouglas Raillard 385b0b7276SDan Handley.. _Armv7-A and Armv8-A: https://developer.arm.com/products/architecture/a-profile 396f625747SDouglas Raillard.. _Secure Monitor: http://www.arm.com/products/processors/technologies/trustzone/tee-smc.php 404bf3349bSDan Handley.. _Power State Coordination Interface (PSCI): PSCI_ 41*2159138cSManish V Badarkhe.. _PSCI: https://developer.arm.com/documentation/den0022/latest 424290d343SSandrine Bailleux.. _Trusted Board Boot Requirements CLIENT (TBBR-CLIENT): https://developer.arm.com/docs/den0006/latest 43*2159138cSManish V Badarkhe.. _SMC Calling Convention: https://developer.arm.com/documentation/den0028/latest 443c6261bdSPaul Beesley.. _System Control and Management Interface (SCMI): SCMI_ 45*2159138cSManish V Badarkhe.. _SCMI: https://developer.arm.com/documentation/den0056/latest 46ed811260Sdanh-arm.. _Software Delegated Exception Interface (SDEI): SDEI_ 47*2159138cSManish V Badarkhe.. _SDEI: https://developer.arm.com/documentation/den0054/latest 488cc36aecSPaul Beesley.. _Arm A-Profile architectures: https://developer.arm.com/architectures/cpu-architecture/a-profile 498cc36aecSPaul Beesley.. _view the full documentation: https://www.trustedfirmware.org/docs/tf-a 508cc36aecSPaul Beesley.. _trustedfirmware.org: http://www.trustedfirmware.org 518cc36aecSPaul Beesley 52