From 58356f67d6bba46c965806677d8cbd9dbee2d1c5 Mon Sep 17 00:00:00 2001
From: dg <dg@FreeBSD.org>
Date: Sun, 25 Sep 1994 15:56:25 +0000
Subject: Extended minor number to include bits 16-31. It was done this way
 rather than making it 16bit and extending the major to 16bit because doing
 that would have caused problems with existing filesystems /dev entries. This
 change should have no apparant side effects. This change is needed for the
 DOS partition re-work and other things.

Submitted by:	Bruce Evans
---
 sys/sys/types.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'sys')

diff --git a/sys/sys/types.h b/sys/sys/types.h
index 1d3535e..1a4e48b 100644
--- a/sys/sys/types.h
+++ b/sys/sys/types.h
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)types.h	8.4 (Berkeley) 1/21/94
- * $Id: types.h,v 1.2 1994/08/02 07:53:59 davidg Exp $
+ * $Id: types.h,v 1.3 1994/09/16 11:44:45 paul Exp $
  */
 
 #ifndef _SYS_TYPES_H_
@@ -86,8 +86,13 @@ __END_DECLS
 #endif
 
 #ifndef _POSIX_SOURCE
+/*
+ * minor() gives a cookie instead of an index since we don't want to
+ * change the meanings of bits 0-15 or waste time and space shifting
+ * bits 16-31 for devices that don't use them.
+ */
 #define	major(x)	((int)(((u_int)(x) >> 8)&0xff))	/* major number */
-#define	minor(x)	((int)((x)&0xff))		/* minor number */
+#define	minor(x)	((int)((x)&0xffff00ff))		/* minor number */
 #define	makedev(x,y)	((dev_t)(((x)<<8) | (y)))	/* create dev_t */
 #endif
 
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