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參數(shù)資料
| 型號： | 23913A |
| 英文描述： | Embedded AMD-K6 Processors BIOS Design Guide Application Note? 1.33MB (PDF) |
| 中文描述： | 嵌入式的AMD - K6處理器的BIOS設(shè)計指南應(yīng)用筆記？ 1.33MB（PDF格式） |
| 文件頁數(shù)： | 78/98頁 |
| 文件大?。?/td> | 1365K |
| 代理商： | 23913A |
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66
Embedded AMD Processor Recognition
Embedded AMD-K6 Processors BIOS Design Guide
23913A/0—November 2000
Preliminary Information
3DNow! Extensions
Test
10.If bit 30 of the extended feature flags is set to 1, the
additions to the 3DNow! instruction set are supported.
AMD Multimedia
Instruction
Extensions Test
11.If bit 22 of the extended feature flags is set to 1, the new
multimedia enhancement instructions that augment the
MMX instruction set are supported.
AMD Processor Signature (Extended Function)
Extended function 8000_0001h returns the embedded AMD
processor signature. The signature is returned in the EAX
register and provides generation, model, and stepping
information for AMD processors. Figure 30 shows the contents
returned in the EAX register.
Figure 30. Contents of EAX Register Returned by Extended Function 8000_0001h
Displaying the Processor’s Name
Extended functions 8000_0002h, 8000_0003h, and 8000_0004h
return an ASCII string containing the name of the processor
(also called the boot string or name string). These functions
eliminate the need for software to search for the processor
name in a lookup table, a process requiring a large block of
memory and frequent updates. Instead, software can simply
call these three functions to obtain the name string (48 ASCII
characters in little-endian format) and display it on the screen.
Although the name string can be up to 48 characters in length,
shorter names have the remaining byte locations filled with the
ASCII NULL character (00h). To simplify the display routines
and avoid using screen space, software only needs to display
characters until a NULL character is detected.
12 11
7
3
0
31
Reserved
4
8
Generation/Family
Model
Stepping
11–8
7–4
3–0
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