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2-21

LOCAL X2APIC ARCHITECTURE

processor topology. The relevant information in CPUID leaves 01H and 04H do not

directly map to individual levels of the topology, but merely relate to the sharing

characteristics below different levels.

The extended topology enumeration leaf of CPUID provides topology information and

data that simplify the algorithm to sort out the processor topology within a physical

package from a 32-bit x2APIC ID. Each level of the processor topology is enumerated

by specifying a “level number“ in ECX as input when executing CPUID.EAX=0BH. This

enumeration by level number allows the CPUID.0BH leaf to support more sophisti-

cated topology than the limitation of legacy topology definitions (SMT, core,

package).

The bit fields reported by CPUID.EAX=0BH include the x2APIC ID of the current

logical processor (in EDX), an encoded value of hierarchy referred to as “level type“

(in ECX[15:8]), the number of enabled logical processors at each queried level type

(below its immediate parent level type), and a bit-vector length field to simplify the

parsing of 32-bit x2APIC ID into hierarchical components. The detailed bit field defi-

nitions for CPUID.0BH leaf are shown in Table 2-4.

Table 2-4. CPUID Leaf 0BH Information

Initial EAX

Value Information Provided about the Processor

CPUID leaves > 3 < 80000000 are visible only when

IA32_MISC_ENABLES.BOOT_NT4[bit 22] = 0 (default).

Extended Topology Enumeration Leaf

0BH NOTE:

Most fields of leaf 0BH output depends on the initial value in ECX.

EDX output do not vary with initial value in ECX.

ECX[7:0] output always reflect initial value in ECX.

All other output value for an invalid initial value in ECX are 0.

EAX

EBX

Bits 4-0: Number of bits to shift x2APIC ID right to get unique topology

ID of next level type*. All logical processors with same next level ID

share current level

Bits 31-5: Reserved

Bits 15-00: Number of enabled logical processors at this level type. The

number reflects configuration as shipped by Intel**

Bits 31-16: Reserved

ECX

EDX

Bits 07-00: Level number. Same value as input

Bits 15-08: Level Type***

Bits 31-16: Reserved.

Bits 31-0: x2APIC ID of the current logical processor

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 33 34 35

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