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| 型號(hào)： | 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(jì)指南應(yīng)用筆記？ 1.33MB（PDF格式） |
| 文件頁(yè)數(shù)： | 30/98頁(yè) |
| 文件大小： | 1365K |
| 代理商： | 23913A |
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18
Model 7 and Model 8/[7:0] Registers
Embedded AMD-K6 Processors BIOS Design Guide
23913A/0—November 2000
Preliminary Information
Extended Feature Enable Register (EFER)
The Extended Feature Enable Register (EFER) contains the
control bits that enable the extended features of the AMD-K6
processor. Figure 2 shows the format of the EFER register, and
Table 10 defines the function of each bit of the EFER register.
The EFER register is MSR C000_0080h.
Figure 2. Extended Feature Enable Register (EFER) (Models 7 and 8/[7:0])
1
0
63
S
C
E
Reserved
Description
System Call Extension
Symbol
SCE
Bit
0
Table 10. Extended Feature Enable Register (EFER) Definition (Models 7 and 8/[7:0])
Bit
Description
R/W
Function
Writing a 1 to any reserved bit causes a general protection
fault to occur. All reserved bits are always read as 0.
SCE must be set to 1 to enable the usage of the SYSCALL and
SYSRET instructions.
63–1
Reserved
R
0
System Call Extension (SCE)
1
Notes:
1.
The AMD-K6E processor Model 7 provides the SCE bit in the EFER register, but this bit does not affect processor operation because the
SYSCALL and SYSRET instructions and the STAR register are not supported in this models.
R/W
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