1*54fd6939SJiyong ParkTrusted Firmware-A 2*54fd6939SJiyong Park================== 3*54fd6939SJiyong Park 4*54fd6939SJiyong ParkTrusted Firmware-A (TF-A) is a reference implementation of secure world software 5*54fd6939SJiyong Parkfor `Arm A-Profile architectures`_ (Armv8-A and Armv7-A), including an Exception 6*54fd6939SJiyong ParkLevel 3 (EL3) `Secure Monitor`_. It provides a suitable starting point for 7*54fd6939SJiyong Parkproductization of secure world boot and runtime firmware, in either the AArch32 8*54fd6939SJiyong Parkor AArch64 execution states. 9*54fd6939SJiyong Park 10*54fd6939SJiyong ParkTF-A implements Arm interface standards, including: 11*54fd6939SJiyong Park 12*54fd6939SJiyong Park- `Power State Coordination Interface (PSCI)`_ 13*54fd6939SJiyong Park- `Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)`_ 14*54fd6939SJiyong Park- `SMC Calling Convention`_ 15*54fd6939SJiyong Park- `System Control and Management Interface (SCMI)`_ 16*54fd6939SJiyong Park- `Software Delegated Exception Interface (SDEI)`_ 17*54fd6939SJiyong Park 18*54fd6939SJiyong ParkThe code is designed to be portable and reusable across hardware platforms and 19*54fd6939SJiyong Parksoftware models that are based on the Armv8-A and Armv7-A architectures. 20*54fd6939SJiyong Park 21*54fd6939SJiyong ParkIn collaboration with interested parties, we will continue to enhance TF-A 22*54fd6939SJiyong Parkwith reference implementations of Arm standards to benefit developers working 23*54fd6939SJiyong Parkwith Armv7-A and Armv8-A TrustZone technology. 24*54fd6939SJiyong Park 25*54fd6939SJiyong ParkUsers are encouraged to do their own security validation, including penetration 26*54fd6939SJiyong Parktesting, on any secure world code derived from TF-A. 27*54fd6939SJiyong Park 28*54fd6939SJiyong ParkMore Info and Documentation 29*54fd6939SJiyong Park--------------------------- 30*54fd6939SJiyong Park 31*54fd6939SJiyong ParkTo find out more about Trusted Firmware-A, please `view the full documentation`_ 32*54fd6939SJiyong Parkthat is available through `trustedfirmware.org`_. 33*54fd6939SJiyong Park 34*54fd6939SJiyong Park-------------- 35*54fd6939SJiyong Park 36*54fd6939SJiyong Park*Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.* 37*54fd6939SJiyong Park 38*54fd6939SJiyong Park.. _Armv7-A and Armv8-A: https://developer.arm.com/products/architecture/a-profile 39*54fd6939SJiyong Park.. _Secure Monitor: http://www.arm.com/products/processors/technologies/trustzone/tee-smc.php 40*54fd6939SJiyong Park.. _Power State Coordination Interface (PSCI): PSCI_ 41*54fd6939SJiyong Park.. _PSCI: http://infocenter.arm.com/help/topic/com.arm.doc.den0022d/Power_State_Coordination_Interface_PDD_v1_1_DEN0022D.pdf 42*54fd6939SJiyong Park.. _Trusted Board Boot Requirements CLIENT (TBBR-CLIENT): https://developer.arm.com/docs/den0006/latest/trusted-board-boot-requirements-client-tbbr-client-armv8-a 43*54fd6939SJiyong Park.. _SMC Calling Convention: http://infocenter.arm.com/help/topic/com.arm.doc.den0028b/ARM_DEN0028B_SMC_Calling_Convention.pdf 44*54fd6939SJiyong Park.. _System Control and Management Interface (SCMI): SCMI_ 45*54fd6939SJiyong Park.. _SCMI: http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/DEN0056A_System_Control_and_Management_Interface.pdf 46*54fd6939SJiyong Park.. _Software Delegated Exception Interface (SDEI): SDEI_ 47*54fd6939SJiyong Park.. _SDEI: http://infocenter.arm.com/help/topic/com.arm.doc.den0054a/ARM_DEN0054A_Software_Delegated_Exception_Interface.pdf 48*54fd6939SJiyong Park.. _Arm A-Profile architectures: https://developer.arm.com/architectures/cpu-architecture/a-profile 49*54fd6939SJiyong Park.. _view the full documentation: https://www.trustedfirmware.org/docs/tf-a 50*54fd6939SJiyong Park.. _trustedfirmware.org: http://www.trustedfirmware.org 51*54fd6939SJiyong Park 52