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?