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Segment Limit is a 20-bit value specifying the segment size:
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if G = 0, 1 byte to 1 MB.
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if G = 1, 4 KB to 4 GB, in increments of 4KB.
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Base address is a 32-bit address of the segment start location.
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G granularity bit indicates how segment size should be interpreted:
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0 = 64KB,
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1 = 4KB - 4GB(!).
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DPL - 2-bit privilege level descriptor. Defines segment privilege level.
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P - segment present in memory: yes/no
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Segment descriptor format:
