add blktochr()

2 files changed, 37 insertions, 1 deletions

diff --git a/sys/arch/i386/i386/conf.c b/sys/arch/i386/i386/conf.c
index 2442e8eda1d..80863341d02 100644
--- a/sys/arch/i386/i386/conf.c
+++ b/sys/arch/i386/i386/conf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: conf.c,v 1.25 1996/11/06 01:35:06 deraadt Exp $	*/
+/*	$OpenBSD: conf.c,v 1.26 1996/11/06 01:35:25 deraadt Exp $	*/
 /*	$NetBSD: conf.c,v 1.75 1996/05/03 19:40:20 christos Exp $	*/
 
 /*
@@ -376,6 +376,24 @@ chrtoblk(dev)
 }
 
 /*
+ * Convert a character device number to a block device number.
+ */
+dev_t
+blktochr(dev)
+	dev_t dev;
+{
+	int blkmaj = major(dev);
+	int i;
+
+	if (blkmaj >= nblkdev)
+		return (NODEV);
+	for (i = 0; i < sizeof(chrtoblktbl)/sizeof(chrtoblktbl[0]); i++)
+		if (blkmaj == chrtoblktbl[i])
+			return (makedev(i, minor(dev)));
+	return (NODEV);
+}
+
+/*
  * This entire table could be autoconfig()ed but that would mean that
  * the kernel's idea of the console would be out of sync with that of
  * the standalone boot.  I think it best that they both use the same
diff --git a/sys/arch/sparc/sparc/conf.c b/sys/arch/sparc/sparc/conf.c
index 228fcd7d05d..9cbca7042cb 100644
--- a/sys/arch/sparc/sparc/conf.c
+++ b/sys/arch/sparc/sparc/conf.c
@@ -404,3 +404,21 @@ chrtoblk(dev)
 		return (NODEV);
 	return (makedev(blkmaj, minor(dev)));
 }
+
+/*
+ * Convert a character device number to a block device number.
+ */
+dev_t
+blktochr(dev)
+	dev_t dev;
+{
+	int blkmaj = major(dev);
+	int i;
+
+	if (blkmaj >= nblkdev)
+		return (NODEV);
+	for (i = 0; i < sizeof(chrtoblktbl)/sizeof(chrtoblktbl[0]); i++)
+		if (blkmaj == chrtoblktbl[i])
+			return (makedev(i, minor(dev)));
+	return (NODEV);
+}