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Appendix B, Values Returned by the CPUID Instruction

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23913A/0-November 2000 Preliminary Information Embedded AMD-K6™ Processors BIOS Design Guide Appendix B Values Returned by the CPUID Instruction Table 39 contains all the values returned for AMD-K6 processors by the CPUID instruction. Table 39. CPUID Values Returned by AMD-K6™ Processors Function Register Function: 0 Function: 1 Function: 8000_0000h Function: 8000_0001h Function: 8000_0002h AMD-K6E Processor (Model 7) EAX 0000_0001h EBX 6874_7541h ECX 444D_4163h EDX 6974_6E65h EAX 0000_057Xh EBX Reserved ECX Reserved EDX 0080_01BFh EAX 8000_0005h EBX Reserved ECX Reserved EDX Reserved EAX 0000_067Xh EBX Reserved ECX Reserved EDX 0080_05BFh EAX 2D44_4D41h EBX 6D74_364Bh ECX 202F_7720h EDX 746C_756Dh AMD-K6-2 & AMD-K6-2E Processors (Model 8) 0000_0001h 6874_7541h 444D_4163h 6974_6E65h 0000_058Xh Reserved Reserved 0080_21BFh 8000_0005h Reserved Reserved Reserved 0000_068Xh Reserved Reserved 8080_29BFh 2D44_4D41h 7428_364Bh 3320_296Dh2 7270_2044h2 AMD-K6-III Processor (Model 9) 0000_0001h 6874_7541h 444D_4163h 6974_6E65h 0000_059Xh Reserved Reserved 0080_21BFh 8000_0006h Reserved Reserved Reserved 0000_069Xh Reserved Reserved 8080_29BFh 2D44_4D41h 7428_364Bh 3320_296Dh 3 5020_2B44h 3 AMD-K6-2E+ & AMD-K6-IIIE+ Processors (Model D) 0000_0001h 6874_7541h 444D_4163h 6974_6E65h 0000_05DXh Reserved Reserved 0080_21BFh 8000_0007h1 Reserved Reserved Reserved 0000_06DXh Reserved Reserved C080_29BFh 2D44_4D41h 7428_364Bh 492D_296Dh 6020_4949h Appendix B 81

Section	Page
Contents	3
List of Figures	7
List of Tables	9
Revision History	11
Introduction	13
Audience	13
Processor Models and Steppings	14
AMDK6™E Embedded Processor	15
Model 7	15
AMDK6™2 Processor	15
Model 8/[7:0]	15
Model 8/[F:8]	15
AMDK6™2E Embedded Processor	16
Model 8/[F:8]	16
AMDK6™2E+ Embedded Processor	16
Model D/[7:4]	16
AMDK6™III Processor	17
Model 9/[3:0]	17
AMDK6™IIIE+ Embedded Processor	17
Model D/[3:0]	17
BIOS Consideration Checklist	18
CPUID	18
CPU Speed Detection	18
ModelSpecific Registers (MSRs)	18
Cache Testing	19
SMM Issues	19
States after RESET and INIT	20
Register States after RESET and INIT	20
Processor State after INIT	21
BuiltIn SelfTest (BIST)	22
CPUID Identification Algorithms	23
System Management Mode (SMM)	25
StateSave Map Differences	25
I/O Trap Dword Differences	25
ModelSpecific Registers Overview	26
Standard Model-Specific Registers (All Models)	28
MachineCheck Address Register (MCAR) and MachineCheck Type Register (MCTR)	28
Test Register 12 (TR12)	28
Time Stamp Counter (TSC)	28
Model 7 and Model 8/[7:0] Registers	29
Extended Feature Enable Register (EFER)	30
Write Handling Control Register (WHCR)	31
Write Allocation	31
Write Cacheability Detection Enable Bit	32
Write Allocate Enable Limit Field	32
Write Allocate Enable 15to16Mbyte Field.	33
SYSCALL/SYSRET Target Address Register (STAR)	34
Model 8/[F:8] Registers	35
Extended Feature Enable Register (EFER)	36
External Write Buffer Empty Control Field	36
Write Handling Control Register (WHCR)	39
Write Allocation	39
Write Allocate Enable Limit Field	40
Write Allocate Enable 15to16Mbyte Field	41
UC/WC Cacheability Control Register (UWCCR)	42
Physical Base Address n (n=0, 1)	43
Physical Address Mask n (n=0, 1)	43
WCn (n=0, 1)	43
UCn (n=0, 1)	43
Memory-Range Restrictions	44
Examples	45
Processor State Observability Register (PSOR)	46
NOL2 Bit	46
STEP Field	46
BF Field	46
Page Flush/Invalidate Register (PFIR)	48
LINPAGE Field	48
PF Bit	48
F/I Bit	49
Model 9 Registers	50
Extended Feature Enable Register (EFER)	51
Level-2 Cache Array Access Register (L2AAR)	52
LRU (Least Recently Used) Field	55
Writing to L2 Tag of AMDK6™III Processor	55
Model D Registers	57
Processor State Observability Register (PSOR) (Low-Power Versions)	58
PBF[2:0] Field	58
VID Field	58
NOL2 Bit	59
STEP Field	59
EBF[2:0] Field	59
Level-2 Cache Array Access Register (L2AAR)	60
LRU (Least Recently Used) Field	64
Writing to L2 Tag of AMDK6IIIE+ Processor	65
Enhanced Power Management Register (EPMR) (Low-Power Versions)	66
EPM 16-Byte I/O Block (Low-Power Versions Only)	67
BVC Field	67
Embedded AMD Processor Recognition	69
CPUID Instruction Overview	69
Testing for the CPUID Instruction	70
Illegal Instruction Exception Method	70
EFLAGS IDBit Method	70
Using CPUID Functions	71
Identifying the Processor’s Vendor	72
Testing For Extended Functions	73
Determining the Processor Signature	73
Identifying Supported Features	75
Determining Instruction Set Support	76
Detection Algorithm for Determining Instruction Set Support	77
CPUID Test	77
Standard Function Test	77
MMX™ Test	77
Optional SSE Test	77
Extended Functions Test	77
3DNow!™ Test	77
Vendor Check	77
3DNow! Extensions Test	78
AMD Multimedia Instruction Extensions Test	78
AMD Processor Signature (Extended Function)	78
Displaying the Processor’s Name	78
Displaying Cache Information	79
Determining AMDPowerNow!™ Technology Information	79
Sample Code	79
New AMDK6™ Processor Instructions	80
Additional Considerations	81
Software Timing Dependencies Relative to Memory Controller Setup	81
Pipelining Support	81
Read-Only Memory	82
Appendix A	83
CPUID	83
Standard Functions	84
Extended Functions	87
Cache Associativity Field Definitions	92
Associativity for L1 Caches and L1 TLBs	92
Associativity for L2 Cache	92
Appendix B	93
Values Returned by the CPUID Instruction	93

Match case Limit results 1 per page

Appendix B

23913A/0—November 2000

Embedded AMD-K6™ Processors BIOS Design Guide

Preliminary Information

Appendix B

Values Returned by the CPUID Instruction

Table 39 contains all the values returned for AMD-K6

processors by the CPUID instruction.

Table 39.

CPUID Values Returned by AMD-K6™ Processors

Function

AMD-K6E

Processor

(Model 7)

AMD-K6-2 &

AMD-K6-2E

Processors

(Model 8)

AMD-K6-

III

Processor

(Model 9)

AMD-K6-2E+ &

AMD-K6-

III

E+

Processors

(Model D)

Function: 0

EAX

EBX

ECX

EDX

0000_0001h

6874_7541h

444D_4163h

6974_6E65h

0000_0001h

6874_7541h

444D_4163h

6974_6E65h

0000_0001h

6874_7541h

444D_4163h

6974_6E65h

0000_0001h

6874_7541h

444D_4163h

6974_6E65h

Function: 1

EAX

EBX

ECX

EDX

0000_057Xh

Reserved

0080_01BFh

0000_058Xh

Reserved

0080_21BFh

0000_059Xh

Reserved

0080_21BFh

0000_05DXh

Reserved

0080_21BFh

Function: 8000_0000h

EAX

EBX

ECX

EDX

8000_0005h

Reserved

8000_0005h

Reserved

8000_0006h

Reserved

8000_0007h

Reserved

Function: 8000_0001h

EAX

EBX

ECX

EDX

0000_067Xh

Reserved

0080_05BFh

0000_068Xh

Reserved

8080_29BFh

0000_069Xh

Reserved

8080_29BFh

0000_06DXh

Reserved

C080_29BFh

Function: 8000_0002h

EAX

EBX

ECX

EDX

2D44_4D41h

6D74_364Bh

202F_7720h

746C_756Dh

2D44_4D41h

7428_364Bh

3320_296Dh

7270_2044h

2D44_4D41h

7428_364Bh

3320_296Dh

5020_2B44h

2D44_4D41h

7428_364Bh

492D_296Dh

6020_4949h