Dmivcprctl-Dmi Vcp Resource Control Register - Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - DATASHEET VOLUME 2 01-2011 Datasheet

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:
Address Offset:
Reset Value:
Access:
Size:
BIOS Optimal Default
Bit
31
30:27
26:24
23:8
7
6:1
0
Datasheet, Volume 2
0/0/0/DMIBAR
2C–2Fh
02000000h
RO, RW
32 bits
00000h
Reset RST/
Attr
Value PWR
RW 0b Uncore
RO 0h
RW 010b Uncore
RO 0h
RO 0b Uncore
RW 00h Uncore
RO 0b Uncore
Description
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.
Reserved
Virtual Channel private ID (VCPID)
Assigns a VC ID to the VC resource. This field can not be modified
when the VC is already enabled.
Reserved
Traffic Class m / Virtual Channel private Map (TCMVCPM)
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 that will
be translated by a virtualization engine, and TC2 (00000010b) is
the only value that should be programmed into this field for VCp
traffic that 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.
Tc0 VCp Map (TC0VCPM)
193