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The Interruption Descriptor Table (IDT) is implemented in idt.{c,h} as
part of the core, but the setup and activation of the IDT and the
registration of specific interruption request handlers is part of
arch.{c,h}. The request handlers are implemented in idt.s and
delegate to kernel_handle_interrupt.
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ker_dbg writes a string to the terminal. In future, it might also write
to a text file, to the serial console or other channels.
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Add a simple Global Descriptor Table implementation based on [0].
[0] http://www.lowlevel.eu/wiki/Global_Descriptor_Table
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