From c738e45cd6ee1e2dc29536c1d6ae8e85cbf04b6d Mon Sep 17 00:00:00 2001
From: ragge <ragge@NetBSD.org>
Date: Sun, 29 Nov 1998 14:31:53 +0000
Subject: [PATCH] Memory disk support.

---
 sys/arch/vax/conf/files.vax |  9 +++--
 sys/arch/vax/vax/md_root.c  | 81 +++++++++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+), 4 deletions(-)
 create mode 100644 sys/arch/vax/vax/md_root.c

diff --git a/sys/arch/vax/conf/files.vax b/sys/arch/vax/conf/files.vax
index 44951d8a151d..7f56c3458bf3 100644
--- a/sys/arch/vax/conf/files.vax
+++ b/sys/arch/vax/conf/files.vax
@@ -1,4 +1,4 @@
-#       $NetBSD: files.vax,v 1.43 1998/11/07 20:58:10 ragge Exp $
+#       $NetBSD: files.vax,v 1.44 1998/11/29 14:31:53 ragge Exp $
 #
 # new style config file for vax architecture
 #
@@ -53,6 +53,10 @@ file	arch/vax/mba/ht.c		ht needs-flag
 # wscons files.
 include "dev/wscons/files.wscons"
 
+# Memory Disk for install floppy
+file arch/vax/vax/md_root.c		memory_disk_hooks
+major	{md = 23}
+
 # MSCP device drivers
 include "arch/vax/mscp/files.mscp"
 major	{ra = 9}
@@ -134,9 +138,6 @@ major	{ sd = 20 }
 major	{ st = 21 }
 major	{ cd = 22 }
 
-# Memory Disk for install floppy
-major	{ md = 23 }
-
 # builtin NCR5380 SCSI-controller on VAXstation 
 device	ncr: scsi, ncr5380sbc
 attach	ncr at vsbus
diff --git a/sys/arch/vax/vax/md_root.c b/sys/arch/vax/vax/md_root.c
new file mode 100644
index 000000000000..11452fd5eec5
--- /dev/null
+++ b/sys/arch/vax/vax/md_root.c
@@ -0,0 +1,81 @@
+/*	$NetBSD: md_root.c,v 1.1 1998/11/29 14:31:53 ragge Exp $	*/
+
+/*
+ * Copyright (c) 1995 Gordon W. Ross
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/param.h>
+#include <sys/systm.h>
+#include <sys/reboot.h>
+
+#include <dev/md.h>
+
+extern int boothowto;
+
+#ifndef MINIROOTSIZE
+#define MINIROOTSIZE 512
+#endif
+
+#define ROOTBYTES (MINIROOTSIZE << DEV_BSHIFT)
+
+/*
+ * This array will be patched to contain a file-system image.
+ * See the program mdsetimage(8) for details.
+ */
+u_int32_t md_root_size = ROOTBYTES;
+char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
+
+/*
+ * This is called during autoconfig.
+ */
+void
+md_attach_hook(unit, md)
+	int unit;
+	struct md_conf *md;
+{
+	if (unit == 0) {
+		/* Setup root ramdisk */
+		md->md_addr = (caddr_t)md_root_image;
+		md->md_size = (size_t)md_root_size;
+		md->md_type = MD_KMEM_FIXED;
+		printf("md%d: internal %dK image area\n", unit,
+		    ROOTBYTES / 1024);
+	}
+}
+
+/*
+ * This is called during open (i.e. mountroot)
+ */
+void
+md_open_hook(unit, md)
+	int unit;
+	struct md_conf *md;
+{
+	if (unit == 0) {
+		/* The root ramdisk only works single-user. */
+		boothowto |= RB_SINGLE;
+	}
+}