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): 43/139頁
文件大小: 1587K
代理商: INTEL386 DX
Intel386
TM
DX MICROPROCESSOR
4.3.4.10 SEGMENT DESCRIPTOR REGISTER
SETTINGS
The contents of the segment descriptor cache vary
depending on the mode the Intel386 DX is operating
in. When operating in Real Address Mode, the seg-
ment base, limit, and other attributes within the seg-
ment cache registers are defined as shown in Figure
4-11.
For compatiblity 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. In Real Address Mode, the internal
‘‘privilege level’’ is always fixed to the highest level,
level 0, so I/O and other privileged opcodes may be
executed.
231630–60
*
Except the 32-bit CS base is initialized to FFFFF000H after reset until first intersegment control transfer (e.g. intersegment CALL, or
intersegment JMP, or INT). (See Figure 4-13 Example.)
Key:
Y
e
yes
N
e
no
0
e
privilege level 0
1
e
privilege level 1
2
e
privilege level 2
3
e
privilege level 3
U
e
expand up
D
B
P
W
e
push/pop 16-bit words
F
e
push/pop 32-bit dwords
e
does not apply to that segment cache register
e
expand down
e
byte granularity
e
page granularity
Figure 4-11. Segment Descriptor Caches for Real Address Mode
(Segment Limit and Attributes are Fixed)
43
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