Index: head/sys/arm64/arm64/pmap.c
===================================================================
--- head/sys/arm64/arm64/pmap.c
+++ head/sys/arm64/arm64/pmap.c
@@ -1142,7 +1142,7 @@
  * Low level mapping routines.....
  ***************************************************/
 
-static void
+void
 pmap_kenter(vm_offset_t sva, vm_size_t size, vm_paddr_t pa, int mode)
 {
 	pd_entry_t *pde;
Index: head/sys/arm64/include/pmap.h
===================================================================
--- head/sys/arm64/include/pmap.h
+++ head/sys/arm64/include/pmap.h
@@ -140,10 +140,12 @@
 	((((va) | (pa)) & L1_OFFSET) == 0 && (size) >= L1_SIZE)
 
 void	pmap_bootstrap(vm_offset_t, vm_offset_t, vm_paddr_t, vm_size_t);
+void	pmap_kenter(vm_offset_t sva, vm_size_t size, vm_paddr_t pa, int mode);
 void	pmap_kenter_device(vm_offset_t, vm_size_t, vm_paddr_t);
 vm_paddr_t pmap_kextract(vm_offset_t va);
 void	pmap_kremove(vm_offset_t);
 void	pmap_kremove_device(vm_offset_t, vm_size_t);
+void	*pmap_mapdev_attr(vm_offset_t pa, vm_size_t size, vm_memattr_t ma);
 
 void	*pmap_mapdev(vm_offset_t, vm_size_t);
 void	*pmap_mapbios(vm_paddr_t, vm_size_t);
Index: head/sys/kern/subr_devmap.c
===================================================================
--- head/sys/kern/subr_devmap.c
+++ head/sys/kern/subr_devmap.c
@@ -287,6 +287,37 @@
 	return ((void *)(va + offset));
 }
 
+#if defined(__aarch64__)
+void *
+pmap_mapdev_attr(vm_offset_t pa, vm_size_t size, vm_memattr_t ma)
+{
+	vm_offset_t va, offset;
+	void * rva;
+
+	/* First look in the static mapping table. */
+	if ((rva = devmap_ptov(pa, size)) != NULL)
+		return (rva);
+
+	offset = pa & PAGE_MASK;
+	pa = trunc_page(pa);
+	size = round_page(size + offset);
+
+	if (early_boot) {
+		akva_devmap_vaddr = trunc_page(akva_devmap_vaddr - size);
+		va = akva_devmap_vaddr;
+		KASSERT(va >= VM_MAX_KERNEL_ADDRESS - L2_SIZE,
+		    ("Too many early devmap mappings"));
+	} else
+		va = kva_alloc(size);
+	if (!va)
+		panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
+
+	pmap_kenter(va, size, pa, ma);
+
+	return ((void *)(va + offset));
+}
+#endif
+
 /*
  * Unmap device memory and free the kva space.
  */