VT-d programming

VT-d programming

I am trying to expriment with DMA remapping using VT-d.  By reading the VT-d spec, I know how to setup the remapping tables.  However, I don't know how to locate the register that will receive the base address of the remapping table hierarchy.

Reading the spec for my processor, I see there is a Root-Entry Table Address Register ( RTADDR_REG) at offset 20–27h.  But what is the base of this "block" ( the spec says this is PEG/DMI VT-d Remapping Engine Register Address Map).

Can anyone help me find this in the documentation somehwhere?

 Thanks!

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