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The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
book

The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition

by Lyla B. Das
May 2024
Intermediate to advanced content levelIntermediate to advanced
665 pages
23h 2m
English
Pearson India
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
528 THE x86 MICROPROCESSORS
15.9.6 | Flat Model
In a ’386 based system, it is not mandatory to use paging and segmentation together.  ere is
the option to turn off the paging mechanism that leaves a segmented architecture. However, a
mechanism to turn off segmentation is not inherently present. However, this can be achieved by
programming techniques.
When the 80386 is used to execute software designed for architectures that do not have
segments, it may be expedient to eff ectively ‘turn off ’ the segmentation features of the 80386.
e 80386 does not have a mode that disables segmentation, but the same eff ect can be achieved
by loading the segment registers with selectors for descriptors that have a base addresses of
0, and by setting the limits ...
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Publisher Resources

ISBN: 9781282663169