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Add a separate documentation directory for TEE subsystem since it is a standalone subsystem which already offers devices consumed by multiple different subsystem drivers. Split overall TEE subsystem documentation modularly where: - The userspace API has been moved to Documentation/userspace-api/tee.rst. - The driver API has been moved to Documentation/driver-api/tee.rst. - The first module covers the overview of TEE subsystem. - The further modules are dedicated to different TEE implementations like: - OP-TEE - AMD-TEE - and so on for future TEE implementation support. Acked-by: Rijo Thomas <Rijo-john.Thomas@amd.com> Acked-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Link: https://lore.kernel.org/r/20231128072352.866859-1-sumit.garg@linaro.org
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.. SPDX-License-Identifier: GPL-2.0
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===================================
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TEE (Trusted Execution Environment)
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===================================
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This document describes the TEE subsystem in Linux.
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Overview
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========
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A TEE is a trusted OS running in some secure environment, for example,
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TrustZone on ARM CPUs, or a separate secure co-processor etc. A TEE driver
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handles the details needed to communicate with the TEE.
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This subsystem deals with:
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- Registration of TEE drivers
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- Managing shared memory between Linux and the TEE
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- Providing a generic API to the TEE
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