diff --git a/sys/kern/subr_devmap.c b/sys/kern/subr_devmap.c
--- a/sys/kern/subr_devmap.c
+++ b/sys/kern/subr_devmap.c
@@ -41,6 +41,8 @@
 #include <machine/pte.h>
 #endif
 
+#define	DEVMAP_PADDR_NOTFOUND	((vm_paddr_t)(-1))
+
 static const struct devmap_entry *devmap_table;
 static boolean_t devmap_bootstrap_done = false;
 
@@ -198,7 +200,7 @@
  * Look up the given physical address in the static mapping data and return the
  * corresponding virtual address, or NULL if not found.
  */
-void *
+static void *
 devmap_ptov(vm_paddr_t pa, vm_size_t size)
 {
 	const struct devmap_entry *pd;
@@ -218,7 +220,7 @@
  * Look up the given virtual address in the static mapping data and return the
  * corresponding physical address, or DEVMAP_PADDR_NOTFOUND if not found.
  */
-vm_paddr_t
+static vm_paddr_t
 devmap_vtop(void * vpva, vm_size_t size)
 {
 	const struct devmap_entry *pd;
diff --git a/sys/sys/devmap.h b/sys/sys/devmap.h
--- a/sys/sys/devmap.h
+++ b/sys/sys/devmap.h
@@ -76,20 +76,6 @@
  */
 void devmap_bootstrap(void);
 
-/*
- * Translate between virtual and physical addresses within a region that is
- * static-mapped by the devmap code.  If the given address range isn't
- * static-mapped, then ptov returns NULL and vtop returns DEVMAP_PADDR_NOTFOUND.
- * The latter implies that you can't vtop just the last byte of physical address
- * space.  This is not as limiting as it might sound, because even if a device
- * occupies the end of the physical address space, you're only prevented from
- * doing vtop for that single byte.  If you vtop a size bigger than 1 it works.
- */
-#define	DEVMAP_PADDR_NOTFOUND	((vm_paddr_t)(-1))
-
-void *     devmap_ptov(vm_paddr_t _pa, vm_size_t _sz);
-vm_paddr_t devmap_vtop(void * _va, vm_size_t _sz);
-
 /* Print the static mapping table; used for bootverbose output. */
 void devmap_print_table(void);