1Trusted Firmware-A
2==================
3
4Trusted Firmware-A (TF-A) is a reference implementation of secure world software
5for `Arm A-Profile architectures`_ (Armv8-A and Armv7-A), including an Exception
6Level 3 (EL3) `Secure Monitor`_. It provides a suitable starting point for
7productization of secure world boot and runtime firmware, in either the AArch32
8or AArch64 execution states.
9
10TF-A implements Arm interface standards, including:
11
12-  `Power State Coordination Interface (PSCI)`_
13-  `Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)`_
14-  `SMC Calling Convention`_
15-  `System Control and Management Interface (SCMI)`_
16-  `Software Delegated Exception Interface (SDEI)`_
17
18The code is designed to be portable and reusable across hardware platforms and
19software models that are based on the Armv8-A and Armv7-A architectures.
20
21In collaboration with interested parties, we will continue to enhance TF-A
22with reference implementations of Arm standards to benefit developers working
23with Armv7-A and Armv8-A TrustZone technology.
24
25Users are encouraged to do their own security validation, including penetration
26testing, on any secure world code derived from TF-A.
27
28More Info and Documentation
29---------------------------
30
31To find out more about Trusted Firmware-A, please `view the full documentation`_
32that is available through `trustedfirmware.org`_.
33
34--------------
35
36*Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.*
37
38.. _Armv7-A and Armv8-A: https://developer.arm.com/products/architecture/a-profile
39.. _Secure Monitor: http://www.arm.com/products/processors/technologies/trustzone/tee-smc.php
40.. _Power State Coordination Interface (PSCI): PSCI_
41.. _PSCI: http://infocenter.arm.com/help/topic/com.arm.doc.den0022d/Power_State_Coordination_Interface_PDD_v1_1_DEN0022D.pdf
42.. _Trusted Board Boot Requirements CLIENT (TBBR-CLIENT): https://developer.arm.com/docs/den0006/latest/trusted-board-boot-requirements-client-tbbr-client-armv8-a
43.. _SMC Calling Convention: http://infocenter.arm.com/help/topic/com.arm.doc.den0028b/ARM_DEN0028B_SMC_Calling_Convention.pdf
44.. _System Control and Management Interface (SCMI): SCMI_
45.. _SCMI: http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/DEN0056A_System_Control_and_Management_Interface.pdf
46.. _Software Delegated Exception Interface (SDEI): SDEI_
47.. _SDEI: http://infocenter.arm.com/help/topic/com.arm.doc.den0054a/ARM_DEN0054A_Software_Delegated_Exception_Interface.pdf
48.. _Arm A-Profile architectures: https://developer.arm.com/architectures/cpu-architecture/a-profile
49.. _view the full documentation: https://www.trustedfirmware.org/docs/tf-a
50.. _trustedfirmware.org: http://www.trustedfirmware.org
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