參數(shù)資料
型號: intel386 DX
廠商: Intel Corp.
英文描述: 32-Bit CHMOS Microprocessor With Integrated Memory Management(32位CHMOS 微處理器帶集成存儲管理)
中文描述: 32位CHMOS微處理器集成內(nèi)存管理(32位CHMOS微處理器帶集成存儲管理)
文件頁數(shù): 45/139頁
文件大?。?/td> 1587K
代理商: INTEL386 DX
Intel386
TM
DX MICROPROCESSOR
When operating in a Virtual 8086 Mode within the
Protected Mode, the segment base, limit, and other
attributes within the segment cache registers are de-
fined as shown in Figure 4-13. For compatibility with
the 8086 architecture, the base is set to sixteen
times the current selector value, the limit is fixed at
0000FFFFH, and the attributes are fixed so as to
indicate the segment is present and fully usable. The
virtual program executes at lowest privilege level,
level 3, to allow trapping of all IOPL-sensitive in-
structions and level-0-only instructions.
231630–62
Key:
Y
N
0
1
2
3
U
e
yes
e
no
e
privilege level 0
e
privilege level 1
e
privilege level 2
e
privilege level 3
e
expand up
D
B
P
W
F
e
expand down
e
byte granularity
e
page granularity
e
push/pop 16-bit words
e
push/pop 32-bit dwords
e
does not apply to that segment cache register
Figure 4-13. Segment Descriptor Caches for Virtual 8086 Mode within Protected Mode
(Segment Limit and Attributes are Fixed)
45
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