:: : : : Great Global Descriptor Table and Task State Segment almost certainly answer my initial question.
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The Global Descriptor Table stores Task State Segments which store the addresses of virtual memory blocks allocated to the process.
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The processor makes this memory available through the Global Descriptor Table ( GDT ) and one or more Local Descriptor Tables ( LDTs ).
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Call gates use a special selector value to reference a descriptor accessed via the Global Descriptor Table or the Local Descriptor Table, which contains the information needed for the call across privilege boundaries.
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To enter protected mode, the Global Descriptor Table ( GDT ) must first be created with a minimum of three entries : a null descriptor, a code segment descriptor and data segment descriptor.
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The LDT is the sibling of the Global Descriptor Table ( GDT ) and defines up to 8192 memory segments accessible to programs-note that unlike the GDT, the zeroeth entry is a valid entry, and can be used like any other LDT entry.
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The "'Global Descriptor Table "'or " GDT " is a data structure used by Intel x86-family processors starting with the 80286 in order to define the characteristics of the various memory areas used during program execution, including the base address, the size and access privileges like executability and writability.
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