參數(shù)資料
型號: AMDK86
英文描述: AMD K86 - AMD K86 Family BIOS and Software Tools Developers Guide
中文描述: AMD的K86 - AMD的K86系列BIOS和軟件工具開發(fā)人員指南
文件頁數(shù): 70/144頁
文件大?。?/td> 2179K
代理商: AMDK86
58
AMD-K5 Processor
AMD K86 Family BIOS and Software Tools Developers Guide
21062E/0—June 1997
Preliminary Information
Additions to the EFLAGS Register
The EFLAGS register on the AMD-K5 processor defines new
bits in the upper 16 bits of the register to support extensions to
the operating modes. See
“Virtual-8086 Mode Extensions
(VME)” on page 67 and “CPUID” on page 86 for additional
information.
Control Register 4 (CR4) Extensions
Control Register 4 (CR4) was added on the AMD-K5. The bits in
this register control the various architectural extensions. The
majority of the bits are reserved. The default state of CR4 is all
zeros. Figure 13 shows the register and describes the bits. The
architectural extensions are described in Table 19.
Figure 13. Control Register 4 (CR4)
Symbol
GPE
MCE
PSE
DE
TSD
PVI
VME
Description
Global Page Extension
Machine Check Enable
Page Size Extensions
Debugging Extensions
Time Stamp Disable
Protected Virtual Interrupts
Virtual-8086 Mode Extensions 0
Bit
7
6
4
3
2
1
7
6
5
4
3
2
1
0
31
P
S
E
T
S
D
M
C
E
V
M
E
D
E
P
V
I
G
P
E
Reserved
8
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