Re: [SeaBIOS] [PATCH V6 1/9] Add an implementation of a TPM TIS driver

[Stefan Berger]

On 08/19/2011 01:33 PM, Marc Jones wrote:
> On Wed, Aug 10, 2011 at 10:51 AM, Stefan Berger
>   wrote:
> > This patch adds an implementation of a TPM TIS driver for the TPM TIS
> > emulation supported by Qemu (patches posted, not in git yet). Usage of the
> > driver is broken up into several functions. The driver is cleanly separated
> > from the rest of the code through an interface holding pointers to the driver's
> > functions. A client using this driver first probes whether the TPM TIS
> > interface is available (probe function) and then invokes the interface
> > function to initialze the interface and send requests and receive responses.
> >
> > Possible future extensions *could* include a virtio interface for the TPM
> > with a corresponding driver here.
> >
> > v6:
> > reworked timeouts; not hardcoded anymore
> >
> > v5:
> > introducing a configurable threashold as part of the driver interface
> > structure below which the TPM is used for calculating the sha1
> >
> > v2:
> > adapted tpm_drivers.c to be under LGPLv3
> >
> > Signed-off-by: Stefan Berger
>
> Hi Stefan,
>
> Please excuse my TPM ignorance, but is the emulation of a specific
> hardware device or has the TCG defined the registers etc for TPM
> hardware?

Qemu patches provide the emulation of the specific hardware device that 
TCG (trusted comp. group) has defined the registers for. SeaBIOS 
implements a driver for it.

Stefan