Add support for the "nullconsole" console type, for systems with

neither a video console nor a serial port. Use it if the RB_MUTE
flag is set.

Submitted by:	Doug Ambrisko <ambrisko@whistle.com>
Reviewed by:	jhb

sys/boot/i386/libi386/Makefile

@@ -8,7 +8,8 @@ INTERNALSTATICLIB=	true
 
 SRCS=	aout_freebsd.c biosdisk.c biosmem.c biospnp.c biospci.c \
 	bootinfo.c comconsole.c devicename.c elf_freebsd.c gatea20.c \
-	i386_copy.c i386_module.c time.c vidconsole.c pxe.c pxetramp.s
+	i386_copy.c i386_module.c nullconsole.c pxe.c pxetramp.s \
+	time.c vidconsole.c
 
 CFLAGS+=	-I${.CURDIR}/../../common -I${.CURDIR}/../btx/lib \
 		-I${.CURDIR}/../../.. -I.

sys/boot/i386/libi386/bootinfo.c

@@ -88,6 +88,9 @@ bi_getboothowto(char *kargs)
 		case 'd':
 		    howto |= RB_KDB;
 		    break;
+		case 'm':
+		    howto |= RB_MUTE;
+		    break;
 		case 'g':
 		    howto |= RB_GDB;
 		    break;
@@ -116,6 +119,8 @@ bi_getboothowto(char *kargs)
 	    howto |= howto_names[i].mask;
     if (!strcmp(getenv("console"), "comconsole"))
 	howto |= RB_SERIAL;
+    if (!strcmp(getenv("console"), "nullconsole"))
+	howto |= RB_MUTE;
     return(howto);
 }
 

sys/boot/i386/libi386/bootinfo32.c

@@ -88,6 +88,9 @@ bi_getboothowto(char *kargs)
 		case 'd':
 		    howto |= RB_KDB;
 		    break;
+		case 'm':
+		    howto |= RB_MUTE;
+		    break;
 		case 'g':
 		    howto |= RB_GDB;
 		    break;
@@ -116,6 +119,8 @@ bi_getboothowto(char *kargs)
 	    howto |= howto_names[i].mask;
     if (!strcmp(getenv("console"), "comconsole"))
 	howto |= RB_SERIAL;
+    if (!strcmp(getenv("console"), "nullconsole"))
+	howto |= RB_MUTE;
     return(howto);
 }
 

sys/boot/i386/libi386/bootinfo64.c

@@ -88,6 +88,9 @@ bi_getboothowto(char *kargs)
 		case 'd':
 		    howto |= RB_KDB;
 		    break;
+		case 'm':
+		    howto |= RB_MUTE;
+		    break;
 		case 'g':
 		    howto |= RB_GDB;
 		    break;
@@ -116,6 +119,8 @@ bi_getboothowto(char *kargs)
 	    howto |= howto_names[i].mask;
     if (!strcmp(getenv("console"), "comconsole"))
 	howto |= RB_SERIAL;
+    if (!strcmp(getenv("console"), "nullconsole"))
+	howto |= RB_MUTE;
     return(howto);
 }
 

sys/boot/i386/libi386/nullconsole.c

@@ -0,0 +1,88 @@
+/*
+ * nullconsole.c
+ *
+ * Copyright (c) 2000 Whistle Communications, Inc.
+ * All rights reserved.
+ * 
+ * Subject to the following obligations and disclaimer of warranty, use and
+ * redistribution of this software, in source or object code forms, with or
+ * without modifications are expressly permitted by Whistle Communications;
+ * provided, however, that:
+ * 1. Any and all reproductions of the source or object code must include the
+ *    copyright notice above and the following disclaimer of warranties; and
+ * 2. No rights are granted, in any manner or form, to use Whistle
+ *    Communications, Inc. trademarks, including the mark "WHISTLE
+ *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
+ *    such appears in the above copyright notice or in the software.
+ * 
+ * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
+ * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
+ * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
+ * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+ * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
+ * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
+ * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
+ * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
+ * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
+ * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Doug Ambrisko <ambrisko@whistle.com>
+ *
+ * $FreeBSD$
+ */
+
+#include <stand.h>
+#include <bootstrap.h>
+
+static void	nullc_probe(struct console *cp);
+static int	nullc_init(int arg);
+static void	nullc_putchar(int c);
+static int	nullc_getchar(void);
+static int	nullc_ischar(void);
+
+struct console nullconsole = {
+	"nullconsole",
+	"null port",
+	0,
+	nullc_probe,
+	nullc_init,
+	nullc_putchar,
+	nullc_getchar,
+	nullc_ischar
+};
+
+static void
+nullc_probe(struct console *cp)
+{
+	cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
+}
+
+static int
+nullc_init(int arg)
+{
+	return(0);
+}
+
+static void
+nullc_putchar(int c)
+{
+}
+
+static int
+nullc_getchar(void)
+{
+	return(-1);
+}
+
+static int
+nullc_ischar(void)
+{
+	return(0);
+}

sys/boot/i386/loader/conf.c

@@ -90,10 +90,12 @@ struct file_format *file_formats[] = {
  */
 extern struct console vidconsole;
 extern struct console comconsole;
+extern struct console nullconsole;
 
 struct console *consoles[] = {
     &vidconsole,
     &comconsole,
+    &nullconsole,
     NULL
 };
 

sys/boot/i386/loader/main.c

@@ -99,6 +99,8 @@ main(void)
      */
     if (initial_howto & RB_SERIAL)
 	setenv("console", "comconsole", 1);
+    if (initial_howto & RB_MUTE)
+	setenv("console", "nullconsole", 1);
     cons_probe();
 
     /*