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Appendix A
79
23913A/0—November 2000
Embedded AMD-K6™ Processors BIOS Design Guide
Preliminary Information
Function 8000_0006h — L2 Cache Information
This function is only available on AMD-K6 processors models 9 and D.
Input:
EAX = 8000_0006h
Output:
EAX = Reserved
EBX = Reserved
ECX = L2 Unified Cache Information
EDX = Reserved
Function 8000_0006h returns information about the processor’s L2 cache. Table 36
provides the format for the information returned by the 8000_0006h function.
Function 8000_0007h — AMD PowerNow!™ Technology Information
The AMD PowerNow! technology function for enhanced power management is
available on low-power versions of the AMD-K6-2E+ and AMD-K6-IIIE+ processors,
Model D.
Input:
EAX = 8000_0007h
Output:
EAX = Reserved
EBX = Reserved
ECX = Reserved
EDX = EPM Flags
Function 8000_0007h returns information about the processor’s AMD PowerNow!
technology support. Table 37 provides the format for the information returned by the
8000_0007h function.
Table 36.
ECX Format Returned by Function 8000_0006h
L2 Cache
Size (Kbytes)
Associativity
1
Notes:
1. See “Associativity for L2 Cache” on page 80 for more information
Lines per Tag
Line Size (bytes)
ECX
Bits 31–16
Bits 15–12
Bits 11–8
Bits 7–0
Table 37.
EDX Format Returned by Function 8000_0007h
AMD PowerNow!™ Technology
Reserved
Voltage ID
Control
Bus Divisor
Control
Reserved
EDX
1
Notes:
1. A ‘1’ indicates the feature is present, however the feature must still be enabled by software.
Bits 31–3
Bit 2
Bit 1
Bit 0