Index: sys/amd64/amd64/machdep.c
===================================================================
--- sys/amd64/amd64/machdep.c
+++ sys/amd64/amd64/machdep.c
@@ -1341,8 +1341,6 @@
 }
 #endif
 
-u_int basemem;
-
 static int
 add_physmap_entry(uint64_t base, uint64_t length, vm_paddr_t *physmap,
     int *physmap_idxp)
@@ -1579,25 +1577,11 @@
 	quad_t dcons_addr, dcons_size;
 
 	bzero(physmap, sizeof(physmap));
-	basemem = 0;
 	physmap_idx = 0;
 
 	init_ops.parse_memmap(kmdp, physmap, &physmap_idx);
 
 	/*
-	 * Find the 'base memory' segment for SMP
-	 */
-	basemem = 0;
-	for (i = 0; i <= physmap_idx; i += 2) {
-		if (physmap[i] == 0x00000000) {
-			basemem = physmap[i + 1] / 1024;
-			break;
-		}
-	}
-	if (basemem == 0)
-		panic("BIOS smap did not include a basemem segment!");
-
-	/*
 	 * Make hole for "AP -> long mode" bootstrap code.  The
 	 * mp_bootaddress vector is only available when the kernel
 	 * is configured to support APs and APs for the system start
Index: sys/amd64/include/md_var.h
===================================================================
--- sys/amd64/include/md_var.h
+++ sys/amd64/include/md_var.h
@@ -37,7 +37,6 @@
  */
 
 extern	long	Maxmem;
-extern	u_int	basemem;
 extern	int	busdma_swi_pending;
 extern	u_int	cpu_exthigh;
 extern	u_int	cpu_feature;