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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
THE 80286 AND 80386 PROCESSORS 523
15.9 | Calculating the Size of the Logical Address Space
In a segmented model of memory, the address space as viewed by an applications program
(called the logical address space) is a much larger space of up to 2
46
(64 terabytes). How is this
gure obtained? Let us make a calculation.
A selector has 13 bits as index for selecting one of the descriptors from a descriptor table.
us, it can access up to 2
13
descriptors with just one descriptor table. Since two descrip-
tor tables (the GDT and one LDT) are active at a time, 2 × 2
13
segments can be accessed.
Each descriptor corresponds to a segment with a maximum ...
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Publisher Resources

ISBN: 9781282663169