AMD AMD-K6-2/450 Design Guide - Page 79
Displaying Cache Information, Determining AMDPowerNow!™ Technology Information, Sample Code - base frequency
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23913A/0-November 2000 Preliminary Information Embedded AMD-K6™ Processors BIOS Design Guide Note: Extended functions 8000_0002h, 8000_0003h, and 8000_0004h return an incorrect name string for the AMD-K6-2E+ and AMD-K6-IIIE+ processors (Model D). See "Functions 8000_0002h, 8000_0003h, and 8000_0004h - Processor Name String" on page 77 for more information. Displaying Cache Information Extended functions 8000_0005h and 8000_0006h provide cache information for the processor. Some diagnostic software displays information about the system and the processor's configuration. It is common for this type of software to provide cache size and organization information. Functions 8000_0005h and 8000_0006h provide a simple way for software to obtain information about the on-chip caches and translation lookaside buffer (TLB) structures. The size and organization information is returned in the registers as described in "Appendix A" on page 71. Software can simply display these values, eliminating the need for large pieces of code to test the memory structures. Determining AMD PowerNow!™ Technology Information Extended function 8000_0007h provides information regarding the processor's support for AMD PowerNow! and its enhanced power management (EPM) features. Based on the status of the EPM flags, software can determine if the processor supports programmable bus frequency control and programmable voltage ID control. A '1' for each bit indicates that the feature is supported; however, the feature must be enabled by software. See "Function 8000_0007h - AMD PowerNow!™ Technology Information" on page 79 for more detailed bit descriptions. Sample Code A code sample using the CPUID instruction to identify the processor and its features is available from AMD's website at http://www.amd.com/products/cpg/bin. Embedded AMD Processor Recognition 67