diff --git a/sys/alpha/include/bus.h b/sys/alpha/include/bus.h
index 53eefd85754..8c6d3240b28 100644
--- a/sys/alpha/include/bus.h
+++ b/sys/alpha/include/bus.h
@@ -90,6 +90,24 @@ typedef u_int32_t		bus_space_handle_t;
 
 #define BUS_SPACE_UNRESTRICTED	(~0UL)
 
+/*
+ * Map a region of device bus space into CPU virtual address space.
+ */
+
+static __inline int bus_space_map(bus_space_tag_t t, bus_addr_t addr,
+				  bus_size_t size, int flags,
+				  bus_space_handle_t *bshp);
+
+static __inline int
+bus_space_map(bus_space_tag_t t __unused, bus_addr_t addr,
+	      bus_size_t size __unused, int flags __unused,
+	      bus_space_handle_t *bshp)
+{
+
+	*bshp = addr;
+	return (0);
+}
+
 /*
  * Unmap a region of device bus space.
  */
diff --git a/sys/amd64/include/bus_amd64.h b/sys/amd64/include/bus_amd64.h
index 71a25e4bea6..b0bc61b6096 100644
--- a/sys/amd64/include/bus_amd64.h
+++ b/sys/amd64/include/bus_amd64.h
@@ -114,11 +114,19 @@ typedef	uint64_t bus_space_handle_t;
  * Map a region of device bus space into CPU virtual address space.
  */
 
-#define	BUS_SPACE_MAP_CACHEABLE		0x01
-#define	BUS_SPACE_MAP_LINEAR		0x02
+static __inline int bus_space_map(bus_space_tag_t t, bus_addr_t addr,
+				  bus_size_t size, int flags,
+				  bus_space_handle_t *bshp);
 
-int	bus_space_map(bus_space_tag_t t, bus_addr_t addr, bus_size_t size,
-		      int flags, bus_space_handle_t *bshp);
+static __inline int
+bus_space_map(bus_space_tag_t t __unused, bus_addr_t addr,
+	      bus_size_t size __unused, int flags __unused,
+	      bus_space_handle_t *bshp)
+{
+
+	*bshp = addr;
+	return (0);
+}
 
 /*
  * Unmap a region of device bus space.
diff --git a/sys/i386/include/bus_at386.h b/sys/i386/include/bus_at386.h
index e1f6e8e3a9a..277badd0400 100644
--- a/sys/i386/include/bus_at386.h
+++ b/sys/i386/include/bus_at386.h
@@ -122,11 +122,19 @@ typedef	u_int bus_space_handle_t;
  * Map a region of device bus space into CPU virtual address space.
  */
 
-#define	BUS_SPACE_MAP_CACHEABLE		0x01
-#define	BUS_SPACE_MAP_LINEAR		0x02
+static __inline int bus_space_map(bus_space_tag_t t, bus_addr_t addr,
+				  bus_size_t size, int flags,
+				  bus_space_handle_t *bshp);
 
-int	bus_space_map(bus_space_tag_t t, bus_addr_t addr, bus_size_t size,
-		      int flags, bus_space_handle_t *bshp);
+static __inline int
+bus_space_map(bus_space_tag_t t __unused, bus_addr_t addr,
+	      bus_size_t size __unused, int flags __unused,
+	      bus_space_handle_t *bshp)
+{
+
+	*bshp = addr;
+	return (0);
+}
 
 /*
  * Unmap a region of device bus space.
diff --git a/sys/i386/include/bus_pc98.h b/sys/i386/include/bus_pc98.h
index aa9f2b620de..89066bcae99 100644
--- a/sys/i386/include/bus_pc98.h
+++ b/sys/i386/include/bus_pc98.h
@@ -169,6 +169,19 @@ int i386_bus_space_handle_alloc(bus_space_tag_t t, bus_addr_t bpa,
 void i386_bus_space_handle_free(bus_space_tag_t t, bus_space_handle_t bsh,
 				size_t size);
 
+/*
+ *      int bus_space_map (bus_space_tag_t t, bus_addr_t addr,
+ *          bus_size_t size, int flag, bus_space_handle_t *bshp);
+ *
+ * Map a region of bus space.
+ */
+
+int i386_memio_map(bus_space_tag_t t, bus_addr_t addr, bus_size_t size,
+		   int flag, bus_space_handle_t *bshp);
+
+#define bus_space_map(t, a, s, f, hp)					\
+	i386_memio_map((t), (a), (s), (f), (hp))
+
 /*
  *      int bus_space_unmap (bus_space_tag_t t,
  *          bus_space_handle_t bsh, bus_size_t size);
diff --git a/sys/ia64/include/bus.h b/sys/ia64/include/bus.h
index 0db84a489c8..9c9ae36c3a6 100644
--- a/sys/ia64/include/bus.h
+++ b/sys/ia64/include/bus.h
@@ -119,13 +119,20 @@ typedef	u_long bus_space_handle_t;
 /*
  * Map a region of device bus space into CPU virtual address space.
  */
-#define	BUS_SPACE_MAP_CACHEABLE		0x01
-#define	BUS_SPACE_MAP_LINEAR		0x02
 
-int
-bus_space_map(bus_space_tag_t bst, bus_addr_t addr, bus_size_t size, int flags,
-    bus_space_handle_t *bshp);
+static __inline int bus_space_map(bus_space_tag_t t, bus_addr_t addr,
+				  bus_size_t size, int flags,
+				  bus_space_handle_t *bshp);
 
+static __inline int
+bus_space_map(bus_space_tag_t t __unused, bus_addr_t addr,
+	      bus_size_t size __unused, int flags __unused,
+	      bus_space_handle_t *bshp)
+{
+
+	*bshp = addr;
+	return (0);
+}
 
 /*
  * Unmap a region of device bus space.
diff --git a/sys/pc98/i386/busiosubr.c b/sys/pc98/i386/busiosubr.c
index d8fadadf3cb..f88e8e48951 100644
--- a/sys/pc98/i386/busiosubr.c
+++ b/sys/pc98/i386/busiosubr.c
@@ -197,6 +197,14 @@ i386_bus_space_handle_free(bus_space_tag_t t, bus_space_handle_t bsh,
 /*************************************************************************
  * map
  *************************************************************************/
+int
+i386_memio_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
+	       bus_space_handle_t *bshp)
+{
+
+	return i386_bus_space_handle_alloc(t, bpa, size, bshp);
+}
+
 void
 i386_memio_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
 {
diff --git a/sys/pc98/pc98/busiosubr.c b/sys/pc98/pc98/busiosubr.c
index d8fadadf3cb..f88e8e48951 100644
--- a/sys/pc98/pc98/busiosubr.c
+++ b/sys/pc98/pc98/busiosubr.c
@@ -197,6 +197,14 @@ i386_bus_space_handle_free(bus_space_tag_t t, bus_space_handle_t bsh,
 /*************************************************************************
  * map
  *************************************************************************/
+int
+i386_memio_map(bus_space_tag_t t, bus_addr_t bpa, bus_size_t size, int flags,
+	       bus_space_handle_t *bshp)
+{
+
+	return i386_bus_space_handle_alloc(t, bpa, size, bshp);
+}
+
 void
 i386_memio_unmap(bus_space_tag_t t, bus_space_handle_t bsh, bus_size_t size)
 {
diff --git a/sys/sparc64/include/bus.h b/sys/sparc64/include/bus.h
index 90d33ab4157..c65abee126e 100644
--- a/sys/sparc64/include/bus.h
+++ b/sys/sparc64/include/bus.h
@@ -138,6 +138,25 @@ static void bus_space_barrier(bus_space_tag_t, bus_space_handle_t, bus_size_t,
     bus_size_t, int);
 static int bus_space_subregion(bus_space_tag_t, bus_space_handle_t,
     bus_size_t, bus_size_t, bus_space_handle_t *);
+
+/*
+ * Map a region of device bus space into CPU virtual address space.
+ */
+
+static __inline int bus_space_map(bus_space_tag_t t, bus_addr_t addr,
+				  bus_size_t size, int flags,
+				  bus_space_handle_t *bshp);
+
+static __inline int
+bus_space_map(bus_space_tag_t t __unused, bus_addr_t addr,
+	      bus_size_t size __unused, int flags __unused,
+	      bus_space_handle_t *bshp)
+{
+
+	*bshp = addr;
+	return (0);
+}
+
 /*
  * Unmap a region of device bus space.
  */