1 files changed, 79 insertions, 0 deletions

diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c
new file mode 100644
index 0000000000000..997d7bfde13b9
--- /dev/null
+++ b/sys/kern/kern_conf.c
@@ -0,0 +1,79 @@
+/*-
+ * Parts Copyright (c) 1995 Terrence R. Lambert
+ * Copyright (c) 1995 Julian R. Elischer
+ * 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 Terrence R. Lambert.
+ * 4. The name Terrence R. Lambert may not be used to endorse or promote
+ *    products derived from this software without specific prior written
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Julian R. Elischer ``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 TERRENCE R. LAMBERT 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.
+ *
+ * $Id: kern_lkm.c,v 1.15 1995/09/08 11:08:34 bde Exp $
+ */
+
+#include <sys/param.h>
+#include <sys/conf.h>
+extern d_open_t lkmenodev;
+
+/*
+ * (re)place an entry in the bdevsw or cdevsw table
+ * return the slot used in MAJOR(*descrip)
+ */
+#define ADDENTRY(TTYPE,NXXXDEV) \
+int TTYPE##_add(dev_t *descrip,						\
+		struct TTYPE *cdeventry,				\
+		cdevsw_t *oldentry)					\
+{									\
+	if ( (int)*decsrip == -1) {	/* auto (0 is valid) */		\
+		/*							\
+		 * Search the table looking for a slot...		\
+		 */							\
+		for (i = 0; i < NXXXDEV; i++)				\
+			if (TTYPE[i].d_open == lkmenodev)		\
+				break;		/* found it! */		\
+		/* out of allocable slots? */				\
+		if (i == NXXXDEV) {					\
+			return ENFILE;					\
+		}							\
+	} else {				/* assign */		\
+		if (i < 0 || i >= NXXXDEV) {				\
+			return EINVAL;					\
+		}							\
+	}								\
+									\
+	/* save old */							\
+        if (oldentry) {							\
+		bcopy(&TTYPE[i], oldentry, sizeof(struct TTYPE));	\
+	}								\
+	/* replace with new */						\
+	bcopy(cdeventry, &TTYPE[i], sizeof(struct TTYPE));		\
+									\
+	/* done! */							\
+	*descrip = makedev(i,0);					\
+	return 0							\
+} \
+
+ADDENTRY(cdevsw, nblkdev)
+ADDENTRY(bdevsw, nchrdev)