IDT interrupt descriptor table

The  Interrupt Descriptor Table  (IDT) is  an array  of 8
byte   interrupt  descriptors   in   memory  devoted   to
specifying (at most)  256 interrupt service routines. The
first 32  entries are reserved  for processor exceptions,
and  any 16  of the  remaining  entries can  be used  for
hardware interrupts. The  rest are available for software
interrupts.

source : http://www.acm.uiuc.edu/sigops/roll_your_own/i386/idt.html

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