Vol. 3C 35-67
MODEL-SPECIFIC REGISTERS (MSRS)
Table 35-5 lists model-specific registers (MSRs) that are specific to Intel
®
Atom™ processor with the CPUID signa-
ture with DisplayFamily_DisplayModel of 06_27H.
48BH
1163
IA32_VMX_PROCBASED_
CTLS2
Unique
Capability Reporting Register of Secondary Processor-based
VM-execution Controls (R/O)
See Appendix A.3, “VM-Execution Controls.”
600H
1536
IA32_DS_AREA
Unique
DS Save Area (R/W)
See Table 35-2.
See Section 18.12.4, “Debug Store (DS) Mechanism.”
C000_
0080H
IA32_EFER
Unique
Extended Feature Enables
See Table 35-2.
C000_
0081H
IA32_STAR
Unique
System Call Target Address (R/W)
See Table 35-2.
C000_
0082H
IA32_LSTAR
Unique
IA-32e Mode System Call Target Address (R/W)
See Table 35-2.
C000_
0084H
IA32_FMASK
Unique
System Call Flag Mask (R/W)
See Table 35-2.
C000_
0100H
IA32_FS_BASE
Unique
Map of BASE Address of FS (R/W)
See Table 35-2.
C000_
0101H
IA32_GS_BASE
Unique
Map of BASE Address of GS (R/W)
See Table 35-2.
C000_
0102H
IA32_KERNEL_GSBASE
Unique
Swap Target of BASE Address of GS (R/W) See Table 35-2.
Table 35-5. MSRs Supported by Intel® Atom™ Processors with CPUID Signature 06_27H
Register
Address
Register Name
Scope
Bit Description
Hex
Dec
3F8H
1016
MSR_PKG_C2_RESIDENCY
Package
Package C2 Residency
Note: C-state values are processor specific C-state code names,
unrelated to MWAIT extension C-state parameters or ACPI C-States
63:0
Package
Package C2 Residency Counter. (R/O)
Time that this package is in processor-specific C2 states since last
reset. Counts at 1 Mhz frequency.
3F9H
1017
MSR_PKG_C4_RESIDENCY
Package
Package C4 Residency
Note: C-state values are processor specific C-state code names,
unrelated to MWAIT extension C-state parameters or ACPI C-States
63:0
Package
Package C4 Residency Counter. (R/O)
Time that this package is in processor-specific C4 states since last
reset. Counts at 1 Mhz frequency.
Table 35-4. MSRs in 45 nm and 32 nm Intel® Atom™ Processor Family (Contd.)
Register
Address
Register Name
Shared/
Unique
Bit Description
Hex
Dec