[src/trunk]: src/sys Introduce null console. This pseudo device acts as a nor...

[cdi <cdi%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/aad8de0cb4b2
branches:  trunk
changeset: 553478:aad8de0cb4b2
user:      cdi <cdi%NetBSD.org@localhost>
date:      Fri Oct 17 18:16:42 2003 +0000

description:
Introduce null console. This pseudo device acts as a normal console with the
exception that it discards any output, and is useful for booting the kernel
on headless boxes.

diffstat:

 sys/conf/files |   4 +++-
 sys/dev/cons.c |   6 +++---
 sys/dev/cons.h |  12 ++++++++----
 3 files changed, 14 insertions(+), 8 deletions(-)

diffs (86 lines):

diff -r 8b76a1dbe812 -r aad8de0cb4b2 sys/conf/files
--- a/sys/conf/files    Fri Oct 17 18:15:52 2003 +0000
+++ b/sys/conf/files    Fri Oct 17 18:16:42 2003 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: files,v 1.641 2003/10/13 08:34:15 dyoung Exp $
+#      $NetBSD: files,v 1.642 2003/10/17 18:16:42 cdi Exp $
 
 #      @(#)files.newconf       7.5 (Berkeley) 5/10/93
 
@@ -984,6 +984,7 @@
 defpseudo tb:          tty
 defpseudo rnd
 defpseudo ksyms
+defpseudo nullcons
 
 defpseudo loop:                ifnet
 defpseudo sl:          ifnet
@@ -1084,6 +1085,7 @@
 file   dev/midisyn.c                   midisyn
 file   dev/mm.c
 file   dev/mulaw.c                     mulaw
+file   dev/nullcons_subr.c             nullcons                needs-flag
 file   dev/radio.c                     radio                   needs-flag
 file   dev/rnd.c                       rnd                     needs-flag
 file   dev/rndpool.c                   rnd                     needs-flag
diff -r 8b76a1dbe812 -r aad8de0cb4b2 sys/dev/cons.c
--- a/sys/dev/cons.c    Fri Oct 17 18:15:52 2003 +0000
+++ b/sys/dev/cons.c    Fri Oct 17 18:16:42 2003 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cons.c,v 1.50 2003/10/03 13:15:52 dsl Exp $    */
+/*     $NetBSD: cons.c,v 1.51 2003/10/17 18:16:43 cdi Exp $    */
 
 /*
  * Copyright (c) 1990, 1993
@@ -78,7 +78,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cons.c,v 1.50 2003/10/03 13:15:52 dsl Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cons.c,v 1.51 2003/10/17 18:16:43 cdi Exp $");
 
 #include <sys/param.h>
 #include <sys/proc.h>
@@ -109,7 +109,7 @@
 };
 
 struct tty *constty = NULL;    /* virtual console output device */
-struct consdev *cn_tab;        /* physical console device info */
+struct consdev *cn_tab = NULL; /* physical console device info */
 struct vnode *cn_devvp[2];     /* vnode for underlying device. */
 
 int
diff -r 8b76a1dbe812 -r aad8de0cb4b2 sys/dev/cons.h
--- a/sys/dev/cons.h    Fri Oct 17 18:15:52 2003 +0000
+++ b/sys/dev/cons.h    Fri Oct 17 18:16:42 2003 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cons.h,v 1.21 2003/08/07 16:30:51 agc Exp $    */
+/*     $NetBSD: cons.h,v 1.22 2003/10/17 18:16:43 cdi Exp $    */
 
 /*
  * Copyright (c) 1990, 1993
@@ -103,9 +103,10 @@
 
 /* values for cn_pri - reflect our policy for console selection */
 #define        CN_DEAD         0       /* device doesn't exist */
-#define CN_NORMAL      1       /* device exists but is nothing special */
-#define CN_INTERNAL    2       /* "internal" bit-mapped display */
-#define CN_REMOTE      3       /* serial interface with remote bit set */
+#define CN_NULL                1       /* noop console */
+#define CN_NORMAL      2       /* device exists but is nothing special */
+#define CN_INTERNAL    3       /* "internal" bit-mapped display */
+#define CN_REMOTE      4       /* serial interface with remote bit set */
 
 #ifdef _KERNEL
 
@@ -121,7 +122,10 @@
 void   cnflush __P((void));
 void   cnhalt __P((void));
 void   cnrint __P((void));
+void   nullcnprobe __P((struct consdev *));
+void   nullcninit __P((struct consdev *));
 void   nullcnpollc __P((dev_t, int));
+void   nullconsattach __P((int));
 
 /* console-specific types */
 #define        dev_type_cnprobe(n)     void n __P((struct consdev *))