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AMD AMD-K6-2/450 Design Guide - Page 94

CPUID Values Returned by AMD-K6™ Processors continued, Table 39.

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Preliminary Information Embedded AMD-K6™ Processors BIOS Design Guide 23913A/0-November 2000 Table 39. CPUID Values Returned by AMD-K6™ Processors (continued) Function Register Function: 8000_0003h 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-IIIE+ Processors (Model D) Function: 8000_0004h EAX 6465_6D69h EBX 6520_6169h ECX 6E65_7478h EDX 6E6F_6973h 7365_636F 2h 0072_6F73 2h 0000_0000h 0000_0000h 6563_6F72h 3 726F_7373h 3 0000_0000h 0000_0000h 6563_6F72h 726F_7373h 0000_0000h 0000_0000h Function: 8000_0005h EAX 0000_0073h EBX 0000_0000h ECX 0000_0000h EDX 0000_0000h 0000_0000h 0000_0000h 0000_0000h 0000_0000h 0000_0000h 0000_0000h 0000_0000h 0000_0000h 0000_0000h 0000_0000h 0000_0000h 0000_0000h Function: 8000_0006h EAX Reserved EBX 0280_0140h ECX 2002_0220h EDX 2002_0220h Reserved 0280_0140h 2002_0220h 2002_0220h Reserved 0280_0140h 2002_0220h 2002_0220h Reserved 0280_0140h 2002_0220h 2002_0220h EAX Undefined EBX Undefined ECX Undefined EDX Undefined Function: 8000_0007h Undefined Undefined Undefined Undefined Reserved Reserved 0100_4220h Reserved Reserved Reserved 0xx0_4220h4 Reserved EAX Undefined EBX Undefined ECX Undefined EDX Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined Reserved Reserved Reserved 0000_0007h1 Notes: 1. Low-power versions only. Reserved on standard-power version. 2. Extended functions 8000_0002h, 8000_0003h, and 8000_0004h each return part of the processor name string. Some AMD-K6-2E processors may have the following name string: function 8000_0002h, ECX = 322D_296Dh and EDX = 6F72_5020h, and function 8000_0003h, EAX = 7373_6563h and EBX = 0000_726Fh. 3. Extended functions 8000_0002h, 8000_0003h, and 8000_0004h each return part of the processor name string. Some AMD-K6-IIIE+ processors may have the following name string: function 8000_0002h, ECX = 492D_296Dh and EDX = 5020_4949h, and function 8000_0003h, EAX = 6563_6F72h and EBX = 726F_7373h. 4. Extended function 8000_0006h returns the processor L2 cache information. For the AMD-K6-2E+ processor Model D, ECX = 0080_4220h. For the AMD-K6-IIIE+ processor Model D, ECX = 0100_4220h. 82 Appendix B

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

Embedded AMD-K6™ Processors BIOS Design Guide

23913A/0—November 2000

Preliminary Information

Function: 8000_0003h

EAX

EBX

ECX

EDX

6465_6D69h

6520_6169h

6E65_7478h

6E6F_6973h

7365_636F

0072_6F73

0000_0000h

6563_6F72h

726F_7373h

0000_0000h

6563_6F72h

726F_7373h

0000_0000h

Function: 8000_0004h

EAX

EBX

ECX

EDX

0000_0073h

0000_0000h

Function: 8000_0005h

EAX

EBX

ECX

EDX

Reserved

0280_0140h

2002_0220h

Reserved

0280_0140h

2002_0220h

Reserved

0280_0140h

2002_0220h

Reserved

0280_0140h

2002_0220h

Function: 8000_0006h

EAX

EBX

ECX

EDX

Undefined

Reserved

0100_4220h

Reserved

0xx0_4220h

Reserved

Function: 8000_0007h

EAX

EBX

ECX

EDX

Undefined

Reserved

0000_0007h

Notes:

Low-power versions only. Reserved on standard-power version.

Extended functions 8000_0002h, 8000_0003h, and 8000_0004h each return part of the processor name string. Some AMD-K6-2E pro-

cessors may have the following name string: function 8000_0002h, ECX = 322D_296Dh and EDX = 6F72_5020h, and function

8000_0003h, EAX = 7373_6563h and EBX = 0000_726Fh.

Extended functions 8000_0002h, 8000_0003h, and 8000_0004h each return part of the processor name string. Some AMD-K6-IIIE+

processors may have the following name string: function 8000_0002h, ECX = 492D_296Dh and EDX = 5020_4949h, and function

8000_0003h, EAX = 6563_6F72h and EBX = 726F_7373h.

Extended function 8000_0006h returns the processor L2 cache information. For the AMD-K6-2E+ processor Model D, ECX =

0080_4220h. For the AMD-K6-IIIE+ processor Model D, ECX = 0100_4220h.

Table 39.

CPUID Values Returned by AMD-K6™ Processors (continued)

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)