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Documentation briefly the new fTPM driver running inside TEE. Signed-off-by: Sasha Levin <sashal@kernel.org> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
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27 lines
947 B
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=============================================
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Firmware TPM Driver
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=============================================
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This document describes the firmware Trusted Platform Module (fTPM)
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device driver.
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Introduction
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============
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This driver is a shim for firmware implemented in ARM's TrustZone
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environment. The driver allows programs to interact with the TPM in the same
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way they would interact with a hardware TPM.
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Design
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======
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The driver acts as a thin layer that passes commands to and from a TPM
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implemented in firmware. The driver itself doesn't contain much logic and is
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used more like a dumb pipe between firmware and kernel/userspace.
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The firmware itself is based on the following paper:
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https://www.microsoft.com/en-us/research/wp-content/uploads/2017/06/ftpm1.pdf
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When the driver is loaded it will expose ``/dev/tpmX`` character devices to
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userspace which will enable userspace to communicate with the firmware TPM
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through this device.
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