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27 lines
947 B
27 lines
947 B
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Firmware TPM Driver |
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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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