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A Practical Guide to Trusted Computing by Leendert Van Doorn, David Safford, Ryan Catherman, Kent Yoder, David Challener

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Chapter 4

Writing a TPM Device Driver

The Trusted Platform Module (TPM) is in essence a passive storage device that is hard mounted on the motherboard. The TPM is attached to the Low Pin Count (LPC) bus, a low-pin count bus, which is also used for attaching the system BIOS Flash memory. This ensures that the TPM device is available during the early system bootstrap before any other device is initialized.

Communication with the TPM is typically handled by the TCG device driver library (TDDL), and its interface is defined by the TSS (TCG Software Stack) specification. This library typically communicates with a device driver inside the kernel, and this device driver communicates with the actual TPM device.

There are currently two different TPM ...

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