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* Add isr.s assembler file:
The file declares an array of Interrupt Service Routines (ISR) to handle
the exception vectors from 0 to 19, see Intel SDM Vol. 3A, section
6.3.1.
* Add Idt class:
* The class Genode::Idt represents an Interrupt Descriptor Table as
specified by Intel SDM Vol. 3A, section 6.10.
* The setup function initializes the IDT with 20 entries using the ISR
array defined in the isr.s assembly file.
* Setup and load IDT in Genode::Cpu ctor:
The Idt::setup function is only executed once on the BSP.
* Declare ISRs for interrupts 20-255
* Set IDT size to 256
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