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): 52/139頁
文件大?。?/td> 1587K
代理商: INTEL386 DX
Intel386
TM
DX MICROPROCESSOR
231630–66
Figure 4-17. Simple Protected System
DATA
DESCRIPTOR
SEGMENT BASE 15 . . . 0
0118 (H)
SEGMENT LIMIT 15 . . . 0
FFFF (H)
BASE 31 . . . 24 G D
00 (H)
LIMIT
19.16
F (H)
BASE 23 . . . 16
00 (H)
1
1
0 0
1
0 0 1 0 0 1 0
CODE
DESCRIPTOR
SEGMENT BASE 15 . . . 0
0118 (H)
SEGMENT LIMIT 15 . . . 0
FFFF (H)
BASE 31 . . . 24 G D
00 (H)
LIMIT
19.16
F (H)
BASE 23 . . . 16
00 (H)
1
1
0 0
1
0 0 1 1 0 1 0
NULL DESCRIPTOR
31
24
16 15
8
0
Figure 4-18. GDT Descriptors for Simple System
4.4.8 Tools for Building Protected
Systems
In order to simplify the design of a protected multi-
tasking system, Intel provides a tool which allows
the system designer an easy method of constructing
the data structures needed for a Protected Mode
Intel386 DX system. This tool is the builder BLD-386.
BLD-386 lets the operating system writer specify all
of the segment descriptors discussed in the previous
sections (LDTs, IDTs, GDTs, Gates, and TSSs) in a
high-level language.
4.5 PAGING
4.5.1 Paging Concepts
Paging is another type of memory management use-
ful for virtual memory multitasking operating sys-
tems. Unlike segmentation which modularizes pro-
grams and data into variable length segments,
paging divides programs into multiple uniform size
pages. Pages bear no direct relation to the logical
52
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