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x86 memory segmentation refers to the implementation of memory segmentation in the Intel x86 computer instruction set architecture. Segmentation was introduced on the Intel 8086 in 1978 as a way to allow programs to address more than 64 KB (65,536 bytes) of memory.
In order to calculate the actual address, you multiply the segment part of the address by 16 (or shift it left by 4 bits...same thing), and then add the offset.
3 lut 2015 · The value in a Segment Register, called the Segment Address can be thought of as the base address (0000h) of one of the 64k chunks. The address within the 64k chunk is found by an Offset...
Memory segmentation is an operating system memory management technique of dividing a computer 's primary memory into segments or sections. In a computer system using segmentation, a reference to a memory location includes a value that identifies a segment and an offset (memory location) within that segment. Segments or sections are also used in ...
In real mode each logical address points directly into physical memory location, every logical address consists of two 16 bit parts: The segment part of the logical address contains the base address of a segment with a granularity of 16 bytes, i.e. a segments may start at physical address 0, 16, 32, ..., 2 20 -16.
21 cze 2024 · There is no simple relationship between logical addresses and physical addresses in segmentation. A table stores the information about all such segments and is called Segment Table.
3 sie 2013 · Segmented addressing was a stop-gap to be able to address more than 2^16 bytes in 16 bit software. Given that we're moving to 64 bit processors, I can't see that anyone would ever need segmented addressing again.
