1*91f16700SchasingluluTrusted Firmware-A 2*91f16700Schasinglulu================== 3*91f16700Schasinglulu 4*91f16700SchasingluluTrusted Firmware-A (TF-A) is a reference implementation of secure world software 5*91f16700Schasinglulufor `Arm A-Profile architectures`_ (Armv8-A and Armv7-A), including an Exception 6*91f16700SchasingluluLevel 3 (EL3) `Secure Monitor`_. It provides a suitable starting point for 7*91f16700Schasingluluproductization of secure world boot and runtime firmware, in either the AArch32 8*91f16700Schasingluluor AArch64 execution states. 9*91f16700Schasinglulu 10*91f16700SchasingluluTF-A implements Arm interface standards, including: 11*91f16700Schasinglulu 12*91f16700Schasinglulu- `Power State Coordination Interface (PSCI)`_ 13*91f16700Schasinglulu- `Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)`_ 14*91f16700Schasinglulu- `SMC Calling Convention`_ 15*91f16700Schasinglulu- `System Control and Management Interface (SCMI)`_ 16*91f16700Schasinglulu- `Software Delegated Exception Interface (SDEI)`_ 17*91f16700Schasinglulu 18*91f16700SchasingluluThe code is designed to be portable and reusable across hardware platforms and 19*91f16700Schasinglulusoftware models that are based on the Armv8-A and Armv7-A architectures. 20*91f16700Schasinglulu 21*91f16700SchasingluluIn collaboration with interested parties, we will continue to enhance TF-A 22*91f16700Schasingluluwith reference implementations of Arm standards to benefit developers working 23*91f16700Schasingluluwith Armv7-A and Armv8-A TrustZone technology. 24*91f16700Schasinglulu 25*91f16700SchasingluluUsers are encouraged to do their own security validation, including penetration 26*91f16700Schasinglulutesting, on any secure world code derived from TF-A. 27*91f16700Schasinglulu 28*91f16700SchasingluluMore Info and Documentation 29*91f16700Schasinglulu--------------------------- 30*91f16700Schasinglulu 31*91f16700SchasingluluTo find out more about Trusted Firmware-A, please `view the full documentation`_ 32*91f16700Schasingluluthat is available through `trustedfirmware.org`_. 33*91f16700Schasinglulu 34*91f16700Schasinglulu-------------- 35*91f16700Schasinglulu 36*91f16700Schasinglulu*Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.* 37*91f16700Schasinglulu 38*91f16700Schasinglulu.. _Armv7-A and Armv8-A: https://developer.arm.com/products/architecture/a-profile 39*91f16700Schasinglulu.. _Secure Monitor: http://www.arm.com/products/processors/technologies/trustzone/tee-smc.php 40*91f16700Schasinglulu.. _Power State Coordination Interface (PSCI): PSCI_ 41*91f16700Schasinglulu.. _PSCI: http://infocenter.arm.com/help/topic/com.arm.doc.den0022d/Power_State_Coordination_Interface_PDD_v1_1_DEN0022D.pdf 42*91f16700Schasinglulu.. _Trusted Board Boot Requirements CLIENT (TBBR-CLIENT): https://developer.arm.com/docs/den0006/latest/trusted-board-boot-requirements-client-tbbr-client-armv8-a 43*91f16700Schasinglulu.. _SMC Calling Convention: http://infocenter.arm.com/help/topic/com.arm.doc.den0028b/ARM_DEN0028B_SMC_Calling_Convention.pdf 44*91f16700Schasinglulu.. _System Control and Management Interface (SCMI): SCMI_ 45*91f16700Schasinglulu.. _SCMI: http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/DEN0056A_System_Control_and_Management_Interface.pdf 46*91f16700Schasinglulu.. _Software Delegated Exception Interface (SDEI): SDEI_ 47*91f16700Schasinglulu.. _SDEI: http://infocenter.arm.com/help/topic/com.arm.doc.den0054a/ARM_DEN0054A_Software_Delegated_Exception_Interface.pdf 48*91f16700Schasinglulu.. _Arm A-Profile architectures: https://developer.arm.com/architectures/cpu-architecture/a-profile 49*91f16700Schasinglulu.. _view the full documentation: https://www.trustedfirmware.org/docs/tf-a 50*91f16700Schasinglulu.. _trustedfirmware.org: http://www.trustedfirmware.org 51*91f16700Schasinglulu 52