extremely threadbare null-pointer protection

This protects us from reading null arrays, but not null structs.
It also doesn't protect us from writes to address 0 itself.

It is also incredibly unsafe. According to https://wiki.osdev.org/Memory_Map_(x86),
address 0 contains the real-mode IVT. Am I sure it'll never ever get used
after I switch to protected mode? I really need a page table, something
minimal to protect the first 4KB of physical memory or something.

I wonder what other languages/OSs do to protect against really large struct
definitions.

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