6c09af9f8b
This patch enables BL2 to run in root world (EL3) which is needed as per the security model of RME-enabled systems. Using the existing BL2_AT_EL3 TF-A build option is not convenient because that option assumes TF-A BL1 doesn't exist, which is not the case for RME-enabled systems. For the purposes of RME, we use a normal BL1 image but we also want to run BL2 in EL3 as normally as possible, therefore rather than use the special bl2_entrypoint function in bl2_el3_entrypoint.S, we use a new bl2_entrypoint function (in bl2_rme_entrypoint.S) which doesn't need reset or mailbox initialization code seen in the el3_entrypoint_common macro. The patch also cleans up bl2_el3_entrypoint.S, moving the bl2_run_next_image function to its own file to avoid duplicating code. Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com> Change-Id: I99821b4cd550cadcb701f4c0c4dc36da81c7ef55 |
||
---|---|---|
.husky | ||
bl1 | ||
bl2 | ||
bl2u | ||
bl31 | ||
bl32 | ||
common | ||
docs | ||
drivers | ||
fdts | ||
include | ||
lib | ||
licenses | ||
make_helpers | ||
plat | ||
services | ||
tools | ||
.checkpatch.conf | ||
.cz.json | ||
.editorconfig | ||
.gitignore | ||
.gitreview | ||
Makefile | ||
commitlint.config.js | ||
dco.txt | ||
license.rst | ||
package-lock.json | ||
package.json | ||
readme.rst |
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.