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* Currently, EL1 context is included in cpu_context_t by default for all the build configurations. As part of the cpu context structure, we hold a copy of EL1, EL2 system registers, per world per PE. This context structure is enormous and will continue to grow bigger with the addition of new features incorporating new registers. * Ideally, EL3 should save and restore the system registers at its next lower exception level, which is EL2 in majority of the configurations. * This patch aims at optimising the memory allocation in cases, when the members from the context structure are unused. So el1 system register context must be omitted when lower EL is always x-EL2. * "CTX_INCLUDE_EL2_REGS" is the internal build flag which gets set, when SPD=spmd and SPMD_SPM_AT_SEL2=1 or ENABLE_RME=1. It indicates, the system registers at EL2 are context switched for the respective build configuration. Here, there is no need to save and restore EL1 system registers, while x-EL2 is enabled. Henceforth, this patch addresses this issue, by taking out the EL1 context at all possible places, while EL2 (CTX_INCLUDE_EL2_REGS) is enabled, there by saving memory. Change-Id: Ifddc497d3c810e22a15b1c227a731bcc133c2f4a Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@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 .. _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