Vol. 3C 35-49
MODEL-SPECIFIC REGISTERS (MSRS)
19DH
413
MSR_THERM2_CTL
Unique
15:0
Reserved.
16
TM_SELECT (R/W)
Mode of automatic thermal monitor:
0 = Thermal Monitor 1 (thermally-initiated on-die modulation of
the stop-clock duty cycle)
1 = Thermal Monitor 2 (thermally-initiated frequency transitions)
If bit 3 of the IA32_MISC_ENABLE register is cleared, TM_SELECT
has no effect. Neither TM1 nor TM2 are enabled.
63:16
Reserved.
1A0H
416
IA32_MISC_ENABLE
Enable Misc. Processor Features (R/W)
Allows a variety of processor functions to be enabled and disabled.
0
Fast-Strings Enable
See Table 35-2.
2:1
Reserved.
3
Unique
Automatic Thermal Control Circuit Enable (R/W)
See Table 35-2.
6:4
Reserved.
7
Shared
Performance Monitoring Available (R)
See Table 35-2.
8
Reserved.
9
Hardware Prefetcher Disable (R/W)
When set, disables the hardware prefetcher operation on streams
of data. When clear (default), enables the prefetch queue.
Disabling of the hardware prefetcher may impact processor
performance.
10
Shared
FERR# Multiplexing Enable (R/W)
1 = FERR# asserted by the processor to indicate a pending break
event within the processor
0 = Indicates compatible FERR# signaling behavior
This bit must be set to 1 to support XAPIC interrupt model usage.
11
Shared
Branch Trace Storage Unavailable (RO)
See Table 35-2.
12
Shared
Processor Event Based Sampling Unavailable (RO)
See Table 35-2.
Table 35-3. MSRs in Processors Based on Intel® Core™ Microarchitecture (Contd.)
Register
Address
Register Name
Shared/
Unique
Bit Description
Hex
Dec