AC82G41SLGQ3 Datasheet, PDF (423/604 Pages) Intel Corporation – Intel® 4 Series Chipset Family

Intel^® Trusted Execution Technology Registers (Intel^® 82Q45 and 82Q43 GMCH Only)
11.2
11.2.1
11.2.2
11.2.3
Intel^® TXT Memory Map
Intel TXT introduces a new memory configuration space and requires physical memory
be allocated from the physical memory map. The Intel TXT configuration space is
located just below the top of the 4 GB addressable space. The Intel TXT device memory
is allocated from the top of the physical memory below 4 GB and must be allocated
below other chipset memory regions. Both the Intel TXT configuration space and Intel
TXT device memory must be reported as unavailable to the operating system.
Intel^® TXT Private Space
The Intel TXT private configuration space is decoded beginning at the fixed address
FED20000h and is only accessible by the AC modules and MLE. Special TXT.RD and
TXT.WT cycles have been defined to access this space. Intel TXT management registers
are located in this space and are used by the authenticated code modules and the MLE
to launch and maintain the Intel TXT environment. Any attempt by the BIOS to read
Intel TXT private space will return invalid data. BIOS must report this region as
unavailable to the OS.
Intel^® TXT Public Space
The Intel TXT public configuration space is decoded beginning at the fixed address
FED30000h. The registers located in the Intel TXT public space can be accessed using
standard memory reads and writes. General purpose Intel TXT configuration registers
are located in this space and the BIOS must report this region as unavailable to the OS.
TPM Decode Area
The TPM decode area provides access to TPM configuration registers and is decoded
beginning at the fixed address FED40000h. This space is divided into multiple 4K
pages, also known as localities, with each page controlled by a different set of
attributes. The pages may be accessed by Intel TXT cycles only or Intel TXT cycles and
Private cycles, or Intel TXT cycles, Private cycles, and Public cycles. See the TPM PC
Client specifications for details regarding the TPM configuration space.
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Datasheet
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