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The Unabridged Pentium 4 IA32 Processor Genealogy by Bob Colwell, Tom Shanley

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General Segment Descriptor Format

Figure 7-9 on page 122 illustrates the general format of a segment descriptor. The sections that follow provide a detailed description of each descriptor element.

Figure 7-9. General Format of a Segment Descriptor

It should be noted, however, that there are a number of variations on the segment descriptor and they are covered in the chapters that follow.

Granularity Bit

The granularity bit tells the processor how to interpret the segment descriptor size field (also referred to as the limit):

  • G = 0 indicates that the size field specifies the segment size in bytes.

  • G = 1 indicates that the size is specified in pages ...

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