Intel B940 Datasheet Page 332

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Processor Configuration Registers
332 Datasheet, Volume 2
2.20.6 VC0RSTS—VC0 Resource Status Register
2.21 Intel
®
Trusted Execution Technology (Intel
®
TXT)
Specific Registers
Intel TXT configuration registers are a subset of chipset registers. These registers are
mapped into two regions of memory, representing the public and private configuration
spaces. Registers in the private space can only be accessed after a measured
environment has been established and before the TXT.CMD.CLOSE-PRIVATE command
has been issued. The private space registers are mapped to the address range starting
at FED20000h. The public space registers are mapped to the address range starting at
FED30000h and are available before, during and after a measured environment launch.
The offsets in the table are from the start of either the public or private spaces (all
registers are available within both spaces, though with different permissions).
B/D/F/Type: 0/6/0/MMR
Address Offset: 11A–11Bh
Reset Value: 0002h
Access: RO
Bit Attr
Reset
Value
Description
15:2 RO 0000h Reserved: MBZ
1RO 1b
VC0 Negotiation Pending (VC0NP)
0 = The VC negotiation is complete.
1 = The VC resource is still in the process of negotiation (initialization or
disabling).
This bit indicates the status of the process of Flow Control initialization. It is
set by default on Reset, as well as whenever the corresponding Virtual
Channel is Disabled or the Link is in the DL_Down state. It is cleared when
the link successfully exits the FC_INIT2 state.
Before using a Virtual Channel, software must check whether the VC
Negotiation Pending fields for that Virtual Channel are cleared in both
Components on a Link.
0RO 0bReserved for Port Arbitration Table Status
Table 2-16. Intel
®
TXT Register Address Map
Address
Offset
Register
Symbol
Register Name Reset Value Access
110–117h TXT.DID TXT Device ID Register 00000003A0008086h RO
330–337h TXT.DPR
TXT DMA Protected Range
0000000000000000h
RW-L,
RW-L-K,
RO
400–40Fh
TXT.PUBLI
C.KEY.LOW
ER
TXT Processor Public Key Hash Lower Half
73A13C69E7DCF24C3
84C652BA19DA250h
RO
410–41Fh
TXT.PUBLI
C.KEY.UPP
ER
TXT Processor Public Key Hash Upper Half
D884C70067DFC104B
FDF8368D7254DBBh
RO
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