Why is irq_stack_union a union?

[Andy Lutomirski]

Why not just a struct?

Also, why is this all tangled up in gsbase initialization?  And why
does irq_stack_ptr point 64 bytes from the top?  And why does the
stack overflow thing look STACK_TOP_MARGIN == 128 bytes from the top?

Confused.

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC
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