Short Note on Memory Segmentation
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  • In segmentation a program data and instruction are divided into block called segments, A segment is a logical entity in a program.

  • Programmer's view of segment is as follow:

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Physical view:

  • It consist of non-adjacent of memory allocated to segments.

  • All segments size may or may not be equal and segment can be implemented with or without paging.

  • Collection of segment is called as logical addr space.

  • Each segment is identified by its name.

  • Processor generates logical address, these addresses consist of segment number and an effect in the segment and segment number is used as index to segment page table.

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  • Operating system maintain a segment table for each process. it is usually stored in main memory as a segment that in net to be loaded as long as the process can run.

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  • Each entry in the segment table has a segment base and segment limit.

  • the base contains the segment relocation register for the target segment.

  • The segment limit field contains the length of the segment.

  • Segment table contains the physical address of the start of segment then add the offset to the base and generates the physical address.

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