destructor was failing because it was using memcpy to zero a pml4e that

mapped the address it was writing too, now its a move instruction (8
byte move)

nasa-tables/mem_ctx/mem_ctx.cpp

@@ -76,8 +76,11 @@ namespace nasa
 
 	mem_ctx::~mem_ctx()
 	{
-		set_pml4e(reinterpret_cast<::ppml4e>(get_dirbase()) + this->pml4e_index, pml4e{NULL});
-		while (!SwitchToThread());
+		const auto pml4 = 
+			reinterpret_cast<ppml4e>(
+				set_page(dirbase));
+
+		pml4[pml4e_index] = pml4e{ NULL };
 	}
 
 	void* mem_ctx::set_page(void* addr)