Mark the pages used for the initial page-table entries as wired. This

makes them consistent with the way other page-table pages are allocated.
It also provides the rest of the VM system a good clue that these pages
are used.

Reviewed by:	alc, kib, markj
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D14269

sys/amd64/amd64/pmap.c

@@ -1244,7 +1244,9 @@ pmap_init(void)
 		    ("pmap_init: page table page is out of range"));
 		mpte->pindex = pmap_pde_pindex(KERNBASE) + i;
 		mpte->phys_addr = KPTphys + (i << PAGE_SHIFT);
+		mpte->wire_count = 1;
 	}
+	atomic_add_int(&vm_cnt.v_wire_count, nkpt);
 
 	/*
 	 * If the kernel is running on a virtual machine, then it must assume