35-14 Vol. 3C

MODEL-SPECIFIC REGISTERS (MSRS)

1B1H

433

IA32_PACKAGE_THERM_STATUS

Package Thermal Status Information (RO)
Contains status information about the 

package’s thermal sensor. 
See Section 14.8, “Package Level Thermal 

Management.”

If CPUID.06H: EAX[6] = 1

0

Pkg Thermal Status (RO):

1

Pkg Thermal Status Log (R/W): 

2

Pkg PROCHOT # event (RO)

3

Pkg  PROCHOT  #  log  (R/WC0)

4

Pkg Critical Temperature Status (RO)

5

Pkg Critical Temperature Status log 

(R/WC0)

6

Pkg Thermal Threshold #1 Status (RO)

7

Pkg Thermal Threshold #1 log (R/WC0)

8

Pkg Thermal Threshold #2 Status (RO)

9

Pkg Thermal Threshold #1 log (R/WC0)

10

Pkg Power Limitation Status (RO)

11

Pkg Power Limitation log (R/WC0)

15:12

Reserved.

22:16

Pkg Digital Readout (RO)

63:23

Reserved.

1B2H

434

IA32_PACKAGE_THERM_INTERRUPT

Pkg Thermal Interrupt Control (R/W)
Enables and disables the generation of an 

interrupt on temperature transitions 

detected with the package’s thermal 

sensor. 
See Section 14.8, “Package Level Thermal 

Management.”

If CPUID.06H: EAX[6] = 1

0

Pkg High-Temperature Interrupt Enable

1

Pkg Low-Temperature Interrupt Enable

2

Pkg PROCHOT# Interrupt Enable

3

Reserved.

4

Pkg Overheat Interrupt Enable

7:5

Reserved.

14:8

Pkg Threshold #1 Value

15

Pkg Threshold #1 Interrupt Enable

22:16

Pkg Threshold #2 Value

23

Pkg Threshold #2 Interrupt Enable

24

Pkg Power Limit Notification Enable

Table 35-2.  IA-32 Architectural MSRs (Contd.)

Register 

Address

Architectural MSR Name and bit 

fields 

(Former MSR Name)

MSR/Bit Description

Comment

Hex

Decimal