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Current build infra uses ARM_ARCH_MAJOR/MINOR to come up with march version and uses that march version with the compiler. However in certain situations this is not ideal, like for example when we build with gcc-11 which supports only till march=armv8.5 but we need to build for 8.8 build, this means we need to bump down MAJOR/MINOR and we can't rely on major and minor values from the platform to select march value and build infra doesn't even try to compile and fails with not supported MAJOR/MINOR. By adding a march build helper we try to check if compiler supports given march value from MAJOR/MINOR values from platform, if compiler doesn't support then we try to check what's the max or best supported march version by compiler and choose that march value and try to compile with that. This is a supportive mechanism which will decouple march reliance on MAJOR/MINOR values from platform and will pave way for setting up enabling of features based on MAJOR/MINOR without worrying about the compiler not supporting given MAJOR/MINOR. Also in TF-A we use generic instructions without much reliance or need for exact march necessity. So enabling and building features from armv-8.8 using an armv-8.5 march value is still going to be fine. Please note: Platforms are free to freeze their march values using `MARCH_DIRECTIVE`. In absence of this define we are going to poke the compiler and come up with a potential march value. Change-Id: I673061a269ec9018ff12e75dc375979f5e33b7d1 Signed-off-by: Govindraj Raja <govindraj.raja@arm.com> |
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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)`_ - `Trusted Board Boot Requirements CLIENT (TBBR-CLIENT)`_ - `SMC Calling Convention`_ - `System Control and Management Interface (SCMI)`_ - `Software Delegated Exception Interface (SDEI)`_ 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. More Info and Documentation --------------------------- To find out more about Trusted Firmware-A, please `view the full documentation`_ that is available through `trustedfirmware.org`_. -------------- *Copyright (c) 2013-2019, Arm Limited and Contributors. All rights reserved.* .. _Armv7-A and Armv8-A: https://developer.arm.com/products/architecture/a-profile .. _Secure Monitor: http://www.arm.com/products/processors/technologies/trustzone/tee-smc.php .. _Power State Coordination Interface (PSCI): PSCI_ .. _PSCI: http://infocenter.arm.com/help/topic/com.arm.doc.den0022d/Power_State_Coordination_Interface_PDD_v1_1_DEN0022D.pdf .. _Trusted Board Boot Requirements CLIENT (TBBR-CLIENT): https://developer.arm.com/docs/den0006/latest/trusted-board-boot-requirements-client-tbbr-client-armv8-a .. _SMC Calling Convention: http://infocenter.arm.com/help/topic/com.arm.doc.den0028b/ARM_DEN0028B_SMC_Calling_Convention.pdf .. _System Control and Management Interface (SCMI): SCMI_ .. _SCMI: http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/DEN0056A_System_Control_and_Management_Interface.pdf .. _Software Delegated Exception Interface (SDEI): SDEI_ .. _SDEI: http://infocenter.arm.com/help/topic/com.arm.doc.den0054a/ARM_DEN0054A_Software_Delegated_Exception_Interface.pdf .. _Arm A-Profile architectures: https://developer.arm.com/architectures/cpu-architecture/a-profile .. _view the full documentation: https://www.trustedfirmware.org/docs/tf-a .. _trustedfirmware.org: http://www.trustedfirmware.org