diff --git a/sys/arm64/arm64/pmap.c b/sys/arm64/arm64/pmap.c
--- a/sys/arm64/arm64/pmap.c
+++ b/sys/arm64/arm64/pmap.c
@@ -6518,6 +6518,20 @@
 	pt_entry_t *l2;
 	int i, lvl, l2_blocks, free_l2_count, start_idx;
 
+	/* Use the DMAP region if we can */
+	if (PHYS_IN_DMAP(pa) && PHYS_IN_DMAP(pa + size - 1)) {
+		vm_paddr_t tmp_pa;
+
+		tmp_pa = pa;
+		while ((tmp_pa - pa) < size) {
+			if (!pmap_klookup(PHYS_TO_DMAP(tmp_pa), NULL))
+				goto no_dmap;
+			tmp_pa += PAGE_SIZE;
+		}
+
+		return ((void *)PHYS_TO_DMAP(pa));
+	}
+no_dmap:
 	if (!vm_initialized) {
 		/*
 		 * No L3 ptables so map entire L2 blocks where start VA is:
@@ -6637,6 +6651,9 @@
 	bool preinit_map;
 
 	va = (vm_offset_t)p;
+	if (VIRT_IN_DMAP(va))
+		return;
+
 	l2_blocks =
 	   (roundup2(va + size, L2_SIZE) - rounddown2(va, L2_SIZE)) >> L2_SHIFT;
 	KASSERT(l2_blocks > 0, ("pmap_unmapbios: invalid size %lx", size));