diff --git a/sys/arch/i386/i386/bus_machdep.c b/sys/arch/i386/i386/bus_machdep.c
index edca27c76536..38ccd76f1ade 100644
--- a/sys/arch/i386/i386/bus_machdep.c
+++ b/sys/arch/i386/i386/bus_machdep.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: bus_machdep.c,v 1.9 2001/05/26 21:27:07 chs Exp $	*/
+/*	$NetBSD: bus_machdep.c,v 1.10 2001/09/04 02:37:08 thorpej Exp $	*/
 
 /*-
  * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@@ -457,6 +457,29 @@ i386_memio_subregion(t, bsh, offset, size, nbshp)
 	return (0);
 }
 
+paddr_t
+i386_memio_mmap(t, addr, off, prot, flags)
+	bus_space_tag_t t;
+	bus_addr_t addr;
+	off_t off;
+	int prot;
+	int flags;
+{
+
+	/* Can't mmap I/O space. */
+	if (t == I386_BUS_SPACE_IO)
+		return (EOPNOTSUPP);
+
+	/*
+	 * "addr" is the base address of the device we're mapping.
+	 * "off" is the offset into that device.
+	 *
+	 * Note we are called for each "page" in the device that
+	 * the upper layers want to map.
+	 */
+	return (i386_btop(addr + off));
+}
+
 /*
  * Common function for DMA map creation.  May be called by bus-specific
  * DMA map creation functions.
diff --git a/sys/arch/i386/include/bus.h b/sys/arch/i386/include/bus.h
index cdecab029cd2..0e58048391b6 100644
--- a/sys/arch/i386/include/bus.h
+++ b/sys/arch/i386/include/bus.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: bus.h,v 1.35 2001/07/19 15:32:14 thorpej Exp $	*/
+/*	$NetBSD: bus.h,v 1.36 2001/09/04 02:37:09 thorpej Exp $	*/
 
 /*-
  * Copyright (c) 1996, 1997, 1998, 2001 The NetBSD Foundation, Inc.
@@ -208,6 +208,19 @@ void	i386_memio_free __P((bus_space_tag_t t, bus_space_handle_t bsh,
 #define bus_space_vaddr(t, h) \
 	((t) == I386_BUS_SPACE_MEM ? (void *)(h) : (void *)0)
 
+/*
+ *	paddr_t bus_space_mmap __P((bus_space_tag_t t, bus_addr_t base,
+ *	    off_t offset, int prot, int flags));
+ *
+ * Mmap an area of bus space.
+ */
+
+paddr_t	i386_memio_mmap __P((bus_space_tag_t, bus_addr_t, off_t,
+	    int, int));
+
+#define	bus_space_mmap(t, b, o, p, f)					\
+	i386_memio_mmap((t), (b), (o), (p), (f))
+
 /*
  *	u_intN_t bus_space_read_N __P((bus_space_tag_t tag,
  *	    bus_space_handle_t bsh, bus_size_t offset));