diff --git a/sys/dev/nullcons_subr.c b/sys/dev/nullcons_subr.c
new file mode 100644
index 000000000000..5118703a62f4
--- /dev/null
+++ b/sys/dev/nullcons_subr.c
@@ -0,0 +1,207 @@
+/*	$NetBSD: nullcons_subr.c,v 1.1 2003/10/17 20:27:38 cdi Exp $	*/
+
+/*-
+ * Copyright (c) 2003 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: nullcons_subr.c,v 1.1 2003/10/17 20:27:38 cdi Exp $");
+
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/user.h>
+#include <sys/systm.h>
+#include <sys/buf.h>
+#include <sys/ioctl.h>
+#include <sys/tty.h>
+#include <sys/file.h>
+#include <sys/conf.h>
+#include <sys/vnode.h>
+
+#include <dev/cons.h>
+
+
+extern struct consdev *cn_tab;		/* physical console device info */
+
+static struct tty *nulltty;		/* null console tty */
+
+cons_decl(null);
+
+dev_type_read(nullcndev_read);
+dev_type_ioctl(nullcndev_ioctl);
+dev_type_tty(nullcndev_tty);
+
+static int	nullcons_newdev __P((struct consdev *));
+
+const struct cdevsw nullcn_devsw = {
+	nullopen, nullclose, nullcndev_read, nullwrite, nullcndev_ioctl,
+	nullstop, nullcndev_tty, nopoll, nommap, ttykqfilter, D_TTY
+};
+
+/*
+ * null console device. We need it because of the ioctl() it handles,
+ * which in particular allows control terminal allocation through
+ * TIOCSCTTY ioctl. Without the latter, system won't even boot past init(8)
+ * invocation.
+ */
+int
+nullcndev_read(dev, uio, flag)
+	dev_t dev;
+	struct uio *uio;
+	int flag;
+{
+
+	for(;;);
+	return (0);
+}
+
+int
+nullcndev_ioctl(dev, cmd, data, flag, p)
+	dev_t dev;
+	u_long cmd;
+	caddr_t data;
+	int flag;
+	struct proc *p;
+{
+	int error;
+
+	error = (*nulltty->t_linesw->l_ioctl)(nulltty, cmd, data, flag, p);
+	if (error != EPASSTHROUGH)
+		return (error);
+
+	error = ttioctl(nulltty, cmd, data, flag, p);
+	if (error != EPASSTHROUGH)
+		return (error);
+
+	return (0);
+}
+
+struct tty*
+nullcndev_tty(dev)
+	dev_t dev;
+{
+
+	return nulltty;
+}
+
+/*
+ * Mark console as no-op (null) console. Proper initialization is deferred
+ * to nullconsattach().
+ */
+void
+nullcnprobe(cn)
+	struct consdev *cn;
+{
+
+	cn->cn_pri = CN_NULL;
+	cn->cn_dev = NODEV;
+}
+
+/*
+ * null console initialization. This includes allocation of a new device and
+ * a new tty.
+ */
+void
+nullcninit(cn)
+	struct consdev *cn;
+{
+	static struct consdev nullcn = cons_init(null);
+
+	nullcnprobe(&nullcn);
+	cn_tab = &nullcn;
+}
+
+/*
+ * Dumb getc() implementation. Simply blocks on call.
+ */
+int
+nullcngetc(dev)
+	dev_t dev;
+{
+
+	for(;;);
+	return (0);
+}
+
+/*
+ * Dumb putc() implementation.
+ */
+void
+nullcnputc(dev, c)
+	dev_t dev;
+	int c;
+{
+
+}
+
+/*
+ * Allocate a new console device and a tty to handle console ioctls.
+ */
+int
+nullcons_newdev(cn)
+	struct consdev *cn;
+{
+	int error;
+	int bmajor = -1, cmajor = -1;
+
+	if ((cn == NULL) || (cn->cn_pri != CN_NULL) || (cn->cn_dev != NODEV))
+		return (0);
+
+	/*
+	 * Attach no-op device to the device list.
+	 */
+	error = devsw_attach("nullcn", NULL, &bmajor, &nullcn_devsw, &cmajor);
+	if (error != 0)
+		return (error);
+
+	/*
+	 * Allocate tty (mostly to have sane ioctl()).
+	 */
+	nulltty = ttymalloc();
+	nulltty->t_dev = makedev(cmajor, 0);
+	tty_attach(nulltty);
+	cn->cn_dev = nulltty->t_dev;
+
+	return (0);
+}
+
+/*
+ * Pseudo-device attach function -- it's the right time to do the rest of
+ * initialization. 
+ */
+void
+nullconsattach(pdev_count)
+	int pdev_count;
+{
+
+	nullcons_newdev(cn_tab);
+}