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Processor Configuration Registers

2.12.12 DMIVCPRCTL—DMI VCp Resource Control Register

This register controls the resources associated with the DMI Private Channel (VCp).

B/D/F/Type: 0/0/0/DMIBAR

Address Offset: 2C–2Fh

Reset Value: 02000000h

Access: RO, RW

Size: 32 bits

BIOS Optimal Default 00000h

Bit Access

Reset

Value

RST/

PWR

Description

31 RW 0b Uncore

Virtual Channel private Enable (VCPE)

0 = Virtual Channel is disabled.

1 = Virtual Channel is enabled. See exceptions below.

Software must use the VC Negotiation Pending bit to check

whether the VC negotiation is complete. When VC Negotiation

Pending bit is cleared, a 1 read from this VC Enable bit indicates

that the VC is enabled (Flow Control Initialization is completed for

the PCI Express port). A 0 read from this bit indicates that the

Virtual Channel is currently disabled.

BIOS Requirement:

1. To enable a Virtual Channel, the VC Enable bits for that

Virtual Channel must be set in both Components on a Link.

2. To disable a Virtual Channel, the VC Enable bits for that

Virtual Channel must be cleared in both Components on a

Link.

3. Software must ensure that no traffic is using a Virtual

Channel at the time it is disabled.

4. Software must fully disable a Virtual Channel in both

Components on a Link before re-enabling the Virtual

Channel.

30:27 RO 0h Reserved (RSVD)

26:24 RW 010b Uncore

Virtual Channel private ID (VCPID)

This field assigns a VC ID to the VC resource. This field cannot be

modified when the VC is already enabled.

23:8 RO 0h Reserved (RSVD)

7RO 0bUncoreTraffic Class m / Virtual Channel private Map (TCMVCPM)

6:1 RW 00h Uncore

Traffic Class / Virtual Channel private Map (TCVCPM)

It is recommended that private TC6 (01000000b) is the only

value that should be programmed into this field for VCp traffic

which will be translated by a virtualization engine, and TC2

(00000010b) is the only value that should be programmed into

this field for VCp traffic which will not be translated by a

virtualization engine. This strategy can simplify debug and limit

validation permutations.

BIOS Requirement: Program this field with the value 100010b,

which maps TC2 and TC6 to VCp.

0RO 0bUncoreTc0 VCp Map (TC0VCPM)

1 2 ... 220 221 222 223 224 225 226 227 228 229 230 ... 341 342

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