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Instruction Set (Continued)

9.2.2.3

CPUID Instruction with

EAX = 80000002h, 80000003h, 80000004h

Extended functions 80000002h through 80000004h (EAX

= 80000002h, EAX = 80000003h, EAX = 80000004h) of

the CPUID instruction return an ASCII string containing

the name of the current processor. These functions elimi-

nate the need to look up the processor name in a lookup

table. Software can simply call these functions to obtain

the name of the processor. The string may be 48 ASCII

characters long, and is returned in little endian format. If

the name is shorter than 48 characters long, the remain-

ing bytes will be filled with ASCII NUL character (00h).

9.2.2.4

CPUID Instruction with

EAX = 80000005h

Extended function 80000005h (EAX = 80000005h) of the

CPUID instruction returns information about the TLB and

L1 cachetobelookedupinalookuptable. Refer toTable

9-25.

Table 9-24. Official CPU Name

80000002h

80000003h

80000004h

EAX

CPU Name

EAX

CPU Name

EAX

CPU Name

EBX

CPU Name

EBX

CPU Name

EBX

CPU Name

ECX

CPU Name

ECX

CPU Name

ECX

CPU Name

EDX

CPU Name

EDX

CPU Name

EDX

CPU Name

Table 9-25. Standard CPUID with

EAX = 80000005h

Returned

Contents

Description

EAX

Reserved

EBX

xx xx 70 xxh

TLB is 32 Entry, 4-way set

associative, and has 4 KByte

Pages

EBX

xx xx xx 01h

The CPUID instruction needs

to be executed only once with

an input value of 02h to retrieve

complete information about the

cache and TLB

ECX

xx xx xx 80h

L1 cache is 16 KBytes, 4-way

set associated, and has 16

bytes per line.

EDX

Reserved

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