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by HansHamster
980 days ago
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The interrupt vector table on x86 sits by default at 0000:0000 and the CPU uses it to handle interrupts and other exceptions by jumping to the address entry corresponding to the event. Entry 0 is division by 0, but there are also entries for illegal instruction, hardware interrupts and so on. The address can be changed with the LIDT instruction and operating systems nowadays will just put it wherever, but for backward compatibility it is expected to still be at 0000:0000 (not sure how this is handled nowadays in UEFI, but it should still be possible t o set it up that way). |
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