35-82 Vol. 3C
MODEL-SPECIFIC REGISTERS (MSRS)
Table 35-10 lists model-specific registers (MSRs) that are specific to Intel
®
Atom™ processor C2000 Series (CPUID
signature with DisplayFamily_DisplayModel of 06_4DH).
Table 35-9. Specific MSRs Supported by Intel® Atom™ Processor E3000 Series with CPUID Signature 06_37H
Register
Address
Register Name
Scope
Bit Description
Hex
Dec
668H
1640
MSR_CC6_DEMOTION_POLI
CY_CONFIG
Package
Core C6 demotion policy config MSR
63:0
Controls per-core C6 demotion policy. Writing a value of 0 disables
core level HW demotion policy.
669H
1641
MSR_MC6_DEMOTION_POLI
CY_CONFIG
Package
Module C6 demotion policy config MSR
63:0
Controls module (i.e. two cores sharing the second-level cache) C6
demotion policy. Writing a value of 0 disables module level HW
demotion policy.
664H
1636
MSR_MC6_RESIDENCY_COU
NTER
Module
Module C6 Residency Counter (R/0)
Note: C-state values are processor specific C-state code names,
unrelated to MWAIT extension C-state parameters or ACPI C-
States.
63:0
Time that this module is in module-specific C6 states since last
reset. Counts at 1 Mhz frequency.
Table 35-10. Specific MSRs Supported by Intel® Atom™ Processor C2000 Series with CPUID Signature 06_4DH
Register
Address
Register Name
Scope
Bit Description
Hex
Dec
1A4H
420
MSR_MISC_FEATURE_
CONTROL
Miscellaneous Feature Control (R/W)
0
Core
L2 Hardware Prefetcher Disable (R/W)
If 1, disables the L2 hardware prefetcher, which fetches additional
lines of code or data into the L2 cache.
1
Reserved
2
Core
DCU Hardware Prefetcher Disable (R/W)
If 1, disables the L1 data cache prefetcher, which fetches the next
cache line into L1 data cache.
63:3
Reserved.
1ADH
429
MSR_TURBO_RATIO_LIMIT
Package
Maximum Ratio Limit of Turbo Mode (RW)
7:0
Package
Maximum Ratio Limit for 1C
Maximum turbo ratio limit of 1 core active.
15:8
Package
Maximum Ratio Limit for 2C
Maximum turbo ratio limit of 2 core active.
23:16
Package
Maximum Ratio Limit for 3C
Maximum turbo ratio limit of 3 core active.
31:24
Package
Maximum Ratio Limit for 4C
Maximum turbo ratio limit of 4 core active.