[SeaBIOS] SeaBIOS Digest, Vol 72, Issue 33

[Stefan Berger]

Wim Vervoorn <wvervoorn at eltan.com> wrote on 12/22/2015 08:43:54 AM:

> 
> Hello Stefan,
> 
> I have my doubts. This will work fine as long as the toplevel 
> function tpm_foo() in your example can be implemented to have a 
> single API independent of the required support. If the API differs 
> between the tpm 1.2 and tpm 2.0 case I think it will only be confusing 
things.
> 
> Given the differences between tpm 1.2 and 2.0 do you think you will 
> be able to maintain this single API?

The top level function tpm_foo() will be called by other SeaBIOS code for 
doing TPM initialization, 
measurements, the menu, S3 resume, and for the BIOS API. For the API we 
would support the same API
for TPM 1.2 and for TPM 2. The difference between the tpm12_foo and 
tpm2_foo functions are mainly
that different TPM commands are created and sent to the TIS. So far, this 
works fine.

Do you have concrete concerns regarding this? How else would you do it ?

Regards,
   Stefan

> 
> 
> Best Regards,
> Wim Vervoorn
> 
> Eltan B.V.
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> 
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> 
> From: Stefan Berger [mailto:stefanb at us.ibm.com] 
> Sent: Monday, December 21, 2015 5:50 PM
> To: Kevin O'Connor <kevin at koconnor.net>
> Cc: seabios at seabios.org; Wim Vervoorn <wvervoorn at eltan.com>
> Subject: Re: [SeaBIOS] SeaBIOS Digest, Vol 72, Issue 33
> 
> "Kevin O'Connor" <kevin at koconnor.net> wrote on 12/17/2015 05:22:56 PM:
> 
> > 
> > On Mon, Nov 30, 2015 at 11:32:05AM +0000, Wim Vervoorn wrote:
> > > Hello,
> > > 
> > > I noticed that a lot of work is going on for the TPM support in 
SeaBIOS.
> > > 
> > > All of this work is TPM 1.2 based. I was wondering if there are any
> > > plans to support TPM 2.0 in the future.
> > 
> > I'm not aware of any plans.
> 
> We're working on it...
> 
> 
> So maybe you have some comments to the following:
> 
> There will be a patch for probing the TPM TIS hardware interface for
> whether there's a TPM 1.2 or a TPM 2.
> We then have a patch for prefixing all TPM 1.2 functions with tpm12_
> and then introduce functions like these ones here:
> 
> static ... tpm12_foo() { ... }
> static ... tpm2_foo() { ... }
> 
> tpm_foo()
> {
>     [...]
> 
>     switch (tpmversion) {
>     case TPM_VERSION_1_2:
>         tpm12_foo()
>         break;
>     case TPM_VERSION_2:
>         tpm2_foo();
>         break;
>     }
> 
>     [...]
> }
> 
> That way the probing will lead us to use either TPM1.2 or TPM 2 
> specific code. There will be multiple such constructs in tcgbios.c file.
> 
>    Stefan

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