major restructuring, prepare for smp

code/kernel/mm_phys.c

@@ -6,8 +6,8 @@
 // bootloader at PhysicalWindowBase (always 0xFFFF880000000000).
 //
 // Lock: a single spinlock guards Push/Pop. O(1) for both operations.
-#include <mm_phys.h>
-#include <ke_spinlock.h>
+#include <kernel/mm_phys.h>
+#include <kernel/ke_spinlock.h>
 
 // ---------------------------------------------------------------------------
 // Physical-to-virtual translation via the direct map window.