Global Descriptor Table: Difference between revisions
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The '''Global Descriptor Table''' ('''GDT''') is a binary data structure specific to the [[IA32_Architecture_Family |
The '''Global Descriptor Table''' ('''GDT''') is a binary data structure specific to the [[IA32_Architecture_Family|IA-32]] and [[X86-64|x86-64]] architectures. It contains entries telling the CPU about memory [[Segmentation|segments]]. A similar [[Interrupt Descriptor Table]] exists containing [[task]] and [[Interrupts|interrupt]] descriptors. |
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It is recommended to read the [[GDT Tutorial]]. |
It is recommended to read the [[GDT Tutorial]]. |
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The first entry in the '''GDT''' (Entry 0) should always be null and subsequent entries should be used instead. |
The first entry in the '''GDT''' (Entry 0) should always be null and subsequent entries should be used instead. |
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Entries in the table are accessed by '''Segment Selectors''', which are loaded into '''[[Segmentation]]''' registers either by assembly instructions or by hardware functions such as '''[[Interrupts]]'''. |
Entries in the table are accessed by '''[[Segment Selector|Segment Selectors]]''', which are loaded into '''[[Segmentation]]''' registers either by assembly instructions or by hardware functions such as '''[[Interrupts]]'''. |
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== Segment Descriptor == |
== Segment Descriptor == |
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