From c9ab8cce4303e31432653f183a2b9d23ac5e2e92 Mon Sep 17 00:00:00 2001
From: Jorrit Herder <jnherder@minix3.org>
Date: Fri, 5 Aug 2005 09:43:22 +0000
Subject: [PATCH] Changed minor number of /dev/zero from 6 to 5. (Make sure to
 update your system accordingly or /dev/zero won't work.) Cleaned up comments
 in MEMORY driver.

---
 commands/scripts/MAKEDEV.sh |  2 +-
 drivers/memory/memory.c     | 10 +++++-----
 include/minix/dmap.h        |  2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/commands/scripts/MAKEDEV.sh b/commands/scripts/MAKEDEV.sh
index d3d34c166..2cffe30d7 100755
--- a/commands/scripts/MAKEDEV.sh
+++ b/commands/scripts/MAKEDEV.sh
@@ -61,7 +61,7 @@ do
 	$e mknod kmem c 1 2;	$e chmod 640 kmem
 	$e mknod null c 1 3;	$e chmod 666 null
 	$e mknod boot b 1 4;	$e chmod 600 ram
-	$e mknod zero c 1 6;	$e chmod 644 zero
+	$e mknod zero c 1 5;	$e chmod 644 zero
 	$e chgrp kmem ram mem kmem null boot zero
 	;;
     fd[0-3])
diff --git a/drivers/memory/memory.c b/drivers/memory/memory.c
index 7e2bd28fe..3247cebe9 100644
--- a/drivers/memory/memory.c
+++ b/drivers/memory/memory.c
@@ -23,7 +23,7 @@
 
 #include "assert.h"
 
-#define NR_DEVS            7		/* number of minor devices */
+#define NR_DEVS            6		/* number of minor devices */
 
 PRIVATE struct device m_geom[NR_DEVS];  /* base and size of each device */
 PRIVATE int m_seg[NR_DEVS];  		/* segment index of each device */
@@ -72,8 +72,9 @@ PRIVATE char dev_zero[ZERO_BUF_SIZE];
  *===========================================================================*/
 PUBLIC void main(void)
 {
-  m_init();			/* initialize the memory driver */
-  driver_task(&m_dtab);		/* start driver's main loop */
+/* Main program. Initialize the memory driver and start the main loop. */
+  m_init();			
+  driver_task(&m_dtab);		
 }
 
 
@@ -95,7 +96,6 @@ PRIVATE struct device *m_prepare(device)
 int device;
 {
 /* Prepare for I/O on a device: check if the minor device number is ok. */
-
   if (device < 0 || device >= NR_DEVS) return(NIL_DEV);
   m_device = device;
 
@@ -139,7 +139,7 @@ unsigned nr_req;		/* length of request vector */
 	    if (opcode == DEV_GATHER) return(OK);	/* always at EOF */
 	    break;
 
-	/* Virtual copying. For boot device. */
+	/* Virtual copying. For RAM disk, kernel memory and boot device. */
 	case RAM_DEV:
 	case KMEM_DEV:
 	case BOOT_DEV:
diff --git a/include/minix/dmap.h b/include/minix/dmap.h
index 1cacb17d4..5465be06f 100644
--- a/include/minix/dmap.h
+++ b/include/minix/dmap.h
@@ -40,7 +40,7 @@ extern struct dmap {
 #  define KMEM_DEV    2		/* minor device for /dev/kmem */
 #  define NULL_DEV    3		/* minor device for /dev/null */
 #  define BOOT_DEV    4		/* minor device for /dev/boot */
-#  define ZERO_DEV    6		/* minor device for /dev/zero */
+#  define ZERO_DEV    5		/* minor device for /dev/zero */
 
 /* Full device numbers that are special to the boot monitor and FS. */
 #  define DEV_RAM	0x0100	/* device number of /dev/ram */
-- 
2.44.0