Function BB of Int 1Ah

David

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Nov 25, 2009, 8:47:12 PM11/25/09

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Anyone know what function BBh of Int 0x1A on a PC is related to (which spec
covers it)?

Rod Pemberton

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Nov 27, 2009, 2:43:45 AM11/27/09

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"David" <th...@is.invalid> wrote in message
news:A6lPm.46319$%j4....@newsfe18.iad...

> Anyone know what function BBh of Int 0x1A on a PC is related to (which
spec
> covers it)?
>

Not I.

I don't see BBh for Int 0x1A in RBIL (Ralf Brown's Interrupt List) either.
Are you sure the BBh is correct? There is one listed with 0Bh and another
that has 8Bh... A few of the AX = Bxxxh functions are related to PCI and
Plug-n-Play - which have specifications.

Rod Pemberton
PS. I added a couple of groups. Maybe someone knows. You might also try
one I didn't add: comp.os.msdos.programmer.

David

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Nov 29, 2009, 8:44:25 PM11/29/09

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"Rod Pemberton" <do_no...@nohavenot.cmm> wrote in message
news:heo022$qo$1...@aioe.org...

part of tcg / bitlocker

H. Peter Anvin

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Nov 30, 2009, 12:45:04 PM11/30/09

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On 11/29/2009 05:44 PM, David wrote:
>>
>> I don't see BBh for Int 0x1A in RBIL (Ralf Brown's Interrupt List)
>> either.
>> Are you sure the BBh is correct? There is one listed with 0Bh and
>> another
>> that has 8Bh... A few of the AX = Bxxxh functions are related to PCI and
>> Plug-n-Play - which have specifications.
>>
>> Rod Pemberton
>> PS. I added a couple of groups. Maybe someone knows. You might also
>> try
>> one I didn't add: comp.os.msdos.programmer.
>>
>>
> part of tcg / bitlocker
>

The sad part is that RBIL hasn't been updated for close to 10 years.
Although the BIOS/DOS universe hasn't moved much, it hasn't been
completely still in that time, and what is worse documentation for the
balance is generally extremely hard to find.

I guess it would take volunteers to gather information and publish an
update.

-hpa

Rod Pemberton

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Nov 30, 2009, 9:37:17 PM11/30/09

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"David" <th...@is.invalid> wrote in message

news:iYSQm.51442$%j4.2...@newsfe18.iad...

Well, now that you know what it is, I found some stuff. :-)

"... Trusted Computing Group (TCG) Int 1Ah, sub-function BBh, the interface
that the Bitlocker Drive Encryption (BDE) feature of Microsoft Windows
Vista and later operating systems depends on."
http://msdn.microsoft.com/en-us/library/dd424551.aspx

"An Examination of the Windows Vista MBR"
http://mirror.href.com/thestarman/asm/mbr/VistaMBR.htm

The second one lists: "TCG PC Client Specific Implementation Specification
For Conventional BIOS". So, that's your BIOS standard. A .pdf will come up
if you search for that.

Rod Pemberton

David

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Nov 29, 2009, 8:44:25 PM11/29/09

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"Rod Pemberton" <do_no...@nohavenot.cmm> wrote in message
news:heo022$qo$1...@aioe.org...

yuhong

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Dec 13, 2009, 11:30:55 PM12/13/09

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> The second one lists: "TCG PC Client Specific Implementation Specification
> For Conventional BIOS". So, that's your BIOS standard. A .pdf will come up
> if you search for that.

Here is the link:
http://www.trustedcomputinggroup.org/files/temp/64505409-1D09-3519-AD5C611FAD3F799B/PC%20Client%20Implementation%20for%20BIOS.pdf