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46 Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
Datasheet Volume One
2.5.2.6.11 CPU Thermal and Power Optimization Capabilities
Table 2-8 provides a summary of the processor power and thermal optimization
capabilities that can be accessed over PECI.
Note: The Index values referenced in Table 2-8 are in decimal format.
Table 2-8 also provides information on alternate inband mechanisms to access similar
or equivalent information for register reads and writes where applicable. The user
should consult the appropriate Intel® 64 and IA-32 Architectures Software Developer’s
Manual (SDM) Volumes 1, 2, and 3 or Intel® Xeon® Processor E5 Product Family
Datasheet Volume Two for exact details on MSR or CSR register content.
Table 2-8. RdPkgConfig() & WrPkgConfig() CPU Thermal and Power Optimization
Services Summary (Sheet 1 of 3)
Service
Index
Value
(decimal)
Parameter
Value
(word)
RdPkgConfig()
Data (dword)
WrPkgConfig()
Data (dword)
Description
Alternate Inband
MSR or CSR Access
Package
Identifier Read
00
0x0000
CPUID
Information
Returns processor-
specific information
including CPU family,
model and stepping
information.
Execute CPUID instruction to get
processor signature
0x0001 Platform ID
Used to ensure
microcode update
compatibility with
processor.
MSR 17h: IA32_PLATFORM_ID
0x0002 PCU Device ID
Returns the Device
ID information for
the processor Power
Control Unit.
CSR: DID
0x0003 Max Thread ID
Returns the
maximum ‘Thread
ID’ value supported
by the processor.
MSR: RESOLVED_CORES_MASK
CSR: RESOLVED_CORES_MASK
0x0004
CPU Microcode
Update Revision
Returns processor
microcode and PCU
firmware revision
information.
MSR 8Bh: IA32_BIOS_SIGN_ID
0x0005
MCA Error
Source Log
Returns the MCA
Error Source Log
CSR: MCA_ERR_SRC_LOG
Package Power
SKU Unit Read
30 0x0000
Time, Energy
and Power Units
N/A
Read units for power,
energy and time
used in power
control registers.
MSR 606h:
PACKAGE_POWER_SKU_UNIT
CSR:
PACKAGE_POWER_SKU_UNIT
Package Power
SKU Read
28 0x0000
Package Power
SKU[31:0]
N/A
Returns Thermal
Design Power and
minimum package
power values for the
processor SKU.
MSR 614h:
PACKAGE_POWER_SKU
CSR: PACKAGE_POWER_SKU
Package Power
SKU Read
29 0x0000
Package Power
SKU[64:32]
N/A
Returns the
maximum package
power value for the
processor SKU and
the maximum time
interval for which it
can be sustained.
MSR 614h:
PACKAGE_POWER_SKU
CSR: PACKAGE_POWER_SKU
“Wake on PECI”
Mode Bit Write /
Read
05
0x0001 - Set
0x0000 -
Reset
N/A
“Wake on PECI”
mode bit
Enables package
pop-up to C2 to
service PECI
PCIConfig() accesses
if appropriate.
N/A