X86 Accumulation All-around Descriptor Table
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16 May 11:38
The All-around Descriptor Table (GDT) is a table in anamnesis that defines the accomplishments of the processor articulation registers. The GDT will ascertain the characteristics of the altered articulation registers, it will ascertain the characteristics of all-around memory, and it helps to ensure that the adequate approach operates smoothly.
The GDT is acicular to by a appropriate annals in the x86 chip, the GDT Register, or artlessly the GDTR. The GDTR is 48 $.25 long. The lower 16 $.25 acquaint the admeasurement of the GDT, and the high 32 $.25 acquaint the area of the GDT in memory. Actuality is a blueprint of the GDTR:
|LIMIT|----BASE----|
LIMIT is the admeasurement of the GDT, and Abject is the starting address. Absolute is 1 beneath then the breadth of the table, so if Absolute has the amount 15, then the GDT is 16 bytes long.
The GDT table contains a amount of entries alleged Articulation Descriptors. Anniversary is 8 bytes continued and contains advice on the starting point of the segment, the breadth of the segment, and the admission rights of the segment.
Each separate program will receive, from the operating system, a amount of altered anamnesis segments for use. The characteristics of anniversary bounded anamnesis articulation are stored in a data anatomy alleged the Bounded Descriptor Table (LDT). The GDT contains pointers to anniversary LDT.
The All-around Descriptor Table (GDT) is a table in anamnesis that defines the accomplishments of the processor articulation registers. The GDT will ascertain the characteristics of the altered articulation registers, it will ascertain the characteristics of all-around memory, and it helps to ensure that the adequate approach operates smoothly.
The GDT is acicular to by a appropriate annals in the x86 chip, the GDT Register, or artlessly the GDTR. The GDTR is 48 $.25 long. The lower 16 $.25 acquaint the admeasurement of the GDT, and the high 32 $.25 acquaint the area of the GDT in memory. Actuality is a blueprint of the GDTR:
|LIMIT|----BASE----|
LIMIT is the admeasurement of the GDT, and Abject is the starting address. Absolute is 1 beneath then the breadth of the table, so if Absolute has the amount 15, then the GDT is 16 bytes long.
The GDT table contains a amount of entries alleged Articulation Descriptors. Anniversary is 8 bytes continued and contains advice on the starting point of the segment, the breadth of the segment, and the admission rights of the segment.
Each separate program will receive, from the operating system, a amount of altered anamnesis segments for use. The characteristics of anniversary bounded anamnesis articulation are stored in a data anatomy alleged the Bounded Descriptor Table (LDT). The GDT contains pointers to anniversary LDT.
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