May 2024
Intermediate to advanced
665 pages
23h 2m
English
book
The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
by Lyla B. Das
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
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542 THE x86 MICROPROCESSORS
It has a number of additional pins compared to its predecessors.
The idea of virtual memory is of having an enlarged memory space which is mapped to a smaller
physical memory.
The memory management unit of the 80386 has the capability of paging and segmentation.
Descriptors are 8-byte entities in which the information corresponding to a segment are stored.
Selectors are 16 bits long and point to the descriptor it is associated with.
The paging unit of the MMU can be switched o , but not the segmentation unit.
Protection has many aspects, including protecting tasks from each other, and also the necessity
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