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The Interrupt Descriptor Table (IDT) is a data structure used by the x86 architecture to implement an interrupt vector table. The IDT is used by the processor to determine the correct response to interrupts and exceptions.
The int instruction allows a User Mode process to issue an interrupt signal that has an arbitrary vector ranging from 0 to 255. Therefore, initialization of the IDT must be done carefully, to block illegal interrupts and exceptions simulated by User Mode processes via int instructions.
Intel® 64 architecture delivers 64-bit computing in embedded designs when combined with supporting software. Intel® 64 architecture improves performance by allowing systems to address more than 4 GB of both virtual and physical memory.
There is a Segment Selector in Intel's 64-bit IDT Gate Descriptor. However, from my understanding across the 5 part Intel manuals, the Linear Address of the Interrupt Handler is loaded into RIP from the 64-bit offset specified in the IDT Gate Descriptor.
The only use of the segment selector is to check:
My questions then is:
Many thanks in advance!
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