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authorPer Fogelstrom <pefo@cvs.openbsd.org>1997-05-18 13:46:46 +0000
committerPer Fogelstrom <pefo@cvs.openbsd.org>1997-05-18 13:46:46 +0000
commit967a338a434f8fe1b4b43e2cfcd93591a1cb8f44 (patch)
treef983cdf76f783aa9276f040dc1a313a8566f10cc /sys/arch
parent5f197dfae3f5cfacdc581cb1fe7a85e1b2845060 (diff)
RAMDISK additions
Diffstat (limited to 'sys/arch')
-rw-r--r--sys/arch/arc/dev/rd_root.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/sys/arch/arc/dev/rd_root.c b/sys/arch/arc/dev/rd_root.c
new file mode 100644
index 00000000000..6474f0d2188
--- /dev/null
+++ b/sys/arch/arc/dev/rd_root.c
@@ -0,0 +1,80 @@
+/* $NetBSD: rd_root.c,v 1.2 1996/03/27 16:38:33 perry 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/ramdisk.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: src/distrib/sun3/common/rdsetroot.c
+ */
+int rd_root_size = ROOTBYTES;
+char rd_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
+
+/*
+ * This is called during autoconfig.
+ */
+void
+rd_attach_hook(unit, rd)
+ int unit;
+ struct rd_conf *rd;
+{
+ if (unit == 0) {
+ /* Setup root ramdisk */
+ rd->rd_addr = (caddr_t) rd_root_image;
+ rd->rd_size = (size_t) rd_root_size;
+ rd->rd_type = RD_KMEM_FIXED;
+ printf("rd%d: fixed, %d blocks\n", unit, MINIROOTSIZE);
+ }
+}
+
+/*
+ * This is called during open (i.e. mountroot)
+ */
+void
+rd_open_hook(unit, rd)
+ int unit;
+ struct rd_conf *rd;
+{
+ if (unit == 0) {
+ /* The root ramdisk only works single-user. */
+ boothowto |= RB_SINGLE;
+ }
+}