3ed5606bd1
Currently, when RECLAIM_INIT_CODE is set, the stacks are scaled to ensure that the entirety of the init section can be reclaimed as stack. This causes an issue in lib/psci/aarch64/psci_helpers.S, where the stack size is used for cache operations in psci_do_pwrdown_cache_maintenance(). If the stacks are scaled, then the PSCI code may fail to invalidate some of the stack memory before power down. Resizing stacks is also not good for stability in general, since code that works with a small number of cores may overflow the stack when the number of cores is increased. Change to make every stack be PLATFORM_STACK_SIZE big, and allow the total stack to be smaller than the init section. Any pages of the init section not reclaimed as stack will be set to read-only and execute-never, for security. Change-Id: I10b3884981006431f2fcbec3864c81d4a8c246e8 Signed-off-by: David Horstmann <david.horstmann@arm.com> |
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readme.rst
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.