Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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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