Intel 253666-024US User Manual

Page 219

Vol. 2A 3-173

INSTRUCTION SET REFERENCE, A-M

CPUID—CPU Identification

Table 3-15. Feature Information Returned in the ECX Register

Bit #

Mnemonic

Description

0 SSE3

Streaming SIMD Extensions 3 (SSE3). A value of 1 indicates the

processor supports this technology.

1-2

Reserved

3 MONITOR MONITOR/MWAIT. A value of 1 indicates the processor supports

this feature.

4 DS-CPL CPL Qualified Debug Store. A value of 1 indicates the processor

supports the extensions to the Debug Store feature to allow for

branch message storage qualified by CPL.

VMX

Virtual Machine Extensions. A value of 1 indicates that the

processor supports this technology

SMX

Safer Mode Extensions. A value of 1 indicates that the processor

supports this technology. See Chapter 6, “Procedure Calls,

Interrupts, and Exceptions”.

7 EST

Enhanced Intel SpeedStep® technology. A value of 1 indicates that

the processor supports this technology.

8 TM2

Thermal Monitor 2. A value of 1 indicates whether the processor

supports this technology.

SSSE3

A value of 1 indicates the presence of the Supplemental

Streaming SIMD Extensions 3 (SSSE3). A value of 0 indicates the

instruction extensions are not present in the processor

CNXT-ID

L1 Context ID. A value of 1 indicates the L1 data cache mode can

be set to either adaptive mode or shared mode. A value of 0

indicates this feature is not supported. See definition of the

IA32_MISC_ENABLE MSR Bit 24 (L1 Data Cache Context Mode) for

details.

11-12

Reserved

CMPXCHG16B

CMPXCHG16B Available. A value of 1 indicates that the feature is

available. See the “CMPXCHG8B/CMPXCHG16B—Compare and

Exchange Bytes” section in this chapter for a description.

xTPR Update

Control

xTPR Update Control. A value of 1 indicates that the processor

supports changing IA32_MISC_ENABLES[bit 23].

PDCM

Perfmon and Debug Capability: A value of 1 indicates the

processor supports the performance and debug feature indication

MSR IA32_PERF_CAPABILITIES.

18 - 16

Reserved

SSE4.1

A value of 1 indicates that the processor supports SSE4.1.

SSE4.2

A value of 1 indicates that the processor supports SSE4.2.