https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 5816b3e6577eaa676ceb00a848f0fd65fe2adc29 authored by Linus Torvalds on 26 September 2021, 21:08:19 UTC
Linux 5.15-rc3
Linux 5.15-rc3
Tip revision: 5816b3e
tpm_ftpm_tee.rst
=============================================
Firmware TPM Driver
=============================================
This document describes the firmware Trusted Platform Module (fTPM)
device driver.
Introduction
============
This driver is a shim for firmware implemented in ARM's TrustZone
environment. The driver allows programs to interact with the TPM in the same
way they would interact with a hardware TPM.
Design
======
The driver acts as a thin layer that passes commands to and from a TPM
implemented in firmware. The driver itself doesn't contain much logic and is
used more like a dumb pipe between firmware and kernel/userspace.
The firmware itself is based on the following paper:
https://www.microsoft.com/en-us/research/wp-content/uploads/2017/06/ftpm1.pdf
When the driver is loaded it will expose ``/dev/tpmX`` character devices to
userspace which will enable userspace to communicate with the firmware TPM
through this device.