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a09852d862
Emulate Secure World's FF-A ABIs and allow testing U-Boot FF-A support Features of the sandbox FF-A support: - Introduce an FF-A emulator - Introduce an FF-A device driver for FF-A comms with emulated Secure World - Provides test methods allowing to read the status of the inspected ABIs The sandbox FF-A emulator supports only 64-bit direct messaging. Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com> Reviewed-by: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@konsulko.com> Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org> Cc: Jens Wiklander <jens.wiklander@linaro.org> Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
41 lines
1.7 KiB
Text
41 lines
1.7 KiB
Text
# SPDX-License-Identifier: GPL-2.0
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config ARM_FFA_TRANSPORT
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bool "Enable Arm Firmware Framework for Armv8-A driver"
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depends on DM && (ARM64 || SANDBOX)
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select ARM_SMCCC if !SANDBOX
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select ARM_SMCCC_FEATURES if !SANDBOX
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select LIB_UUID
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select DEVRES
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help
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The Firmware Framework for Arm A-profile processors (FF-A)
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describes interfaces (ABIs) that standardize communication
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between the Secure World and Normal World leveraging TrustZone
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technology.
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The FF-A support in U-Boot is based on FF-A specification v1.0 and uses SMC32
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calling convention.
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FF-A specification:
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https://developer.arm.com/documentation/den0077/a/?lang=en
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In U-Boot FF-A design, FF-A is considered as a discoverable bus.
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FF-A bus is discovered using ARM_SMCCC_FEATURES mechanism performed
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by the PSCI driver.
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The Secure World is considered as one entity to communicate with
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using the FF-A bus.
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FF-A communication is handled by one device and one instance (the bus).
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The FF-A support on U-Boot takes care of all the interactions between Normal
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world and Secure World.
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Generic FF-A methods are implemented in the Uclass (arm-ffa-uclass.c).
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Arm specific methods are implemented in the Arm driver (arm-ffa.c).
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FF-A sandbox is provided to run FF-A under sandbox and allows to test the FF-A Uclass.
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Sandbox support includes an emulator for Arm FF-A which emulates the FF-A side of
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the Secure World and provides FF-A ABIs inspection methods (ffa-emul-uclass.c).
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An FF-A sandbox driver is also provided for FF-A communication with the emulated
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Secure World (sandbox_ffa.c).
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For more details about the FF-A support, please refer to doc/arch/arm64.ffa.rst
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