Page 1580

35-300 Vol. 3C

MODEL-SPECIFIC REGISTERS (MSRS)

The MSRs at 680H-68FH, 6C0H-6CfH are not

available in processor releases before family 0FH,

model 03H. These MSRs replace MSRs previously

located at 1DBH-1DEH.which performed the same

function for early releases.
See Section 17.10, “Last Branch, Call Stack,

Interrupt, and Exception Recording for Processors

based on Skylake Microarchitecture.”

681H

1665

MSR_LASTBRANCH_1_FROM_IP

3, 4, 6

Unique

Last Branch Record 1
See description of MSR_LASTBRANCH_0 at 680H.

682H

1666

MSR_LASTBRANCH_2_FROM_IP

3, 4, 6

Unique

Last Branch Record 2
See description of MSR_LASTBRANCH_0 at 680H.

683H

1667

MSR_LASTBRANCH_3_FROM_IP

3, 4, 6

Unique

Last Branch Record 3
See description of MSR_LASTBRANCH_0 at 680H.

684H

1668

MSR_LASTBRANCH_4_FROM_IP

3, 4, 6

Unique

Last Branch Record 4
See description of MSR_LASTBRANCH_0 at 680H.

685H

1669

MSR_LASTBRANCH_5_FROM_IP

3, 4, 6

Unique

Last Branch Record 5
See description of MSR_LASTBRANCH_0 at 680H.

686H

1670

MSR_LASTBRANCH_6_FROM_IP

3, 4, 6

Unique

Last Branch Record 6
See description of MSR_LASTBRANCH_0 at 680H.

687H

1671

MSR_LASTBRANCH_7_FROM_IP

3, 4, 6

Unique

Last Branch Record 7
See description of MSR_LASTBRANCH_0 at 680H.

688H

1672

MSR_LASTBRANCH_8_FROM_IP

3, 4, 6

Unique

Last Branch Record 8
See description of MSR_LASTBRANCH_0 at 680H.

689H

1673

MSR_LASTBRANCH_9_FROM_IP

3, 4, 6

Unique

Last Branch Record 9
See description of MSR_LASTBRANCH_0 at 680H.

68AH

1674

MSR_LASTBRANCH_10_FROM_IP 3, 4, 6

Unique

Last Branch Record 10
See description of MSR_LASTBRANCH_0 at 680H.

68BH

1675

MSR_LASTBRANCH_11_FROM_IP 3, 4, 6

Unique

Last Branch Record 11
See description of MSR_LASTBRANCH_0 at 680H.

68CH

1676

MSR_LASTBRANCH_12_FROM_IP 3, 4, 6

Unique

Last Branch Record 12
See description of MSR_LASTBRANCH_0 at 680H.

68DH

1677

MSR_LASTBRANCH_13_FROM_IP 3, 4, 6

Unique

Last Branch Record 13
See description of MSR_LASTBRANCH_0 at 680H.

68EH

1678

MSR_LASTBRANCH_14_FROM_IP 3, 4, 6

Unique

Last Branch Record 14
See description of MSR_LASTBRANCH_0 at 680H.

68FH

1679

MSR_LASTBRANCH_15_FROM_IP 3, 4, 6

Unique

Last Branch Record 15
See description of MSR_LASTBRANCH_0 at 680H.

Table 35-41. MSRs in the Pentium® 4 and Intel® Xeon® Processors (Contd.)

Address

Fields and Flags

Model

Avail-

ability

Shared/

Unique

Bit Description

Hex

Dec