> That function is not supposed to be called by old bootloader directly.

It is called indirectly through KiRosPrepareForSystemStartup function,
after it applies a hack (ke/freeldr.c:1272). This new hack is to fix
that old hack. (Ugh!)

> Why is that needed?

Otherwise, the double fault and nmi descriptors become mutilated. When
these interrupts happen, it causes a (virtual or real) machine to
crash / reboot. Better to be able to examine situation from kdbg.

> And why in this function?

Simpler to do it here.

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