8a3e058bbd
all, with magic offsets here and there in different layers of the system. It is just blind luck that everything has always worked as expected so far. Due to this wrong design we have a problem now: we allocate one physical page for lapic, and it happens to overlap with the dummy page, which causes the system to crash. Fix this by keeping the dummy va directly in a variable instead of magic offsets. The asm locore now increments the first pa to hide the dummy page to machdep and pmap.