This is the new unified bootstrap, sometimes known previously as the

'three-stage' bootstrap.
There are a number of caveats with the code in its current state:
 - The i386 bootstrap only supports booting from a floppy.
 - The kernel and kld do not yet know how to deal with the extended
   information and module summary passed in.
 - PnP-based autodetection and demand loading of modules is not implemented.
 - i386 ELF kernel loading is not ready yet.
 - The i386 bootstrap is loaded via an ugly blockmap.

On the alpha, both net- and disk-booting (SRM console machines only) is
supported.  No blockmaps are used by this code.

Obtained from:	Parts from the NetBSD/i386 standalone bootstrap.

1 files changed, 142 insertions, 0 deletions

diff --git a/sys/boot/common/console.c b/sys/boot/common/console.c
new file mode 100644
index 0000000..5aed8b1
--- /dev/null
+++ b/sys/boot/common/console.c
@@ -0,0 +1,142 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON 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 ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$Id$
+ */
+
+#include <stand.h>
+#include <string.h>
+
+#include "bootstrap.h"
+/*
+ * Core console support
+ */
+
+static int	cons_set(struct env_var *ev, int flags, void *value);
+static int	cons_find(char *name);
+
+/*
+ * Detect possible console(s) to use.  The first probed console
+ * is marked active.  Also create the console variable.
+ *	
+ * XXX Add logic for multiple console support.
+ */
+void
+cons_probe(void) 
+{
+    int			cons;
+    int			active;
+    
+    /* Do all console probes, make the fist fully functional console active */
+    for (cons = 0, active = -1; consoles[cons] != NULL; cons++) {
+	consoles[cons]->c_flags = 0;
+ 	consoles[cons]->c_probe(consoles[cons]);
+	if ((consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT)) && (active == -1)) {
+	    consoles[cons]->c_flags |= (C_ACTIVEIN | C_ACTIVEOUT);
+	    active = cons;
+	}
+    }
+    printf("Console: %s\n", consoles[active]->c_desc);
+    env_setenv("console", 0, consoles[active]->c_name, cons_set, env_nounset);
+}
+
+int
+getchar(void)
+{
+    int		cons;
+    int		rv;
+    
+    /* Loop forever polling all active consoles */
+    for(;;)
+	for (cons = 0; consoles[cons] != NULL; cons++)
+	    if ((consoles[cons]->c_flags & C_ACTIVEIN) && 
+		((rv = consoles[cons]->c_in()) != -1))
+		return(rv);
+}
+
+int
+ischar(void)
+{
+    int		cons;
+
+    for (cons = 0; consoles[cons] != NULL; cons++)
+	if ((consoles[cons]->c_flags & C_ACTIVEIN) && 
+	    (consoles[cons]->c_ready() != 0))
+		return(1);
+    return(0);
+}
+
+void
+putchar(int c)
+{
+    int		cons;
+    
+    /* Expand newlines */
+    if (c == '\n')
+	putchar('\r');
+    
+    for (cons = 0; consoles[cons] != NULL; cons++)
+	if (consoles[cons]->c_flags & C_ACTIVEOUT)
+	    consoles[cons]->c_out(c);
+}
+
+static int
+cons_find(char *name)
+{
+    int		cons;
+    
+    for (cons = 0; consoles[cons] != NULL; cons++)
+	if (!strcmp(consoles[cons]->c_name, name))
+	    return(cons);
+    return(-1);
+}
+    
+
+/*
+ * Select a console.
+ *
+ * XXX Note that the console system design allows for some extension
+ *     here (eg. multiple consoles, input/output only, etc.)
+ */
+static int
+cons_set(struct env_var *ev, int flags, void *value)
+{
+    int		cons, active;
+
+    if ((active = cons_find(value)) == -1) {
+	printf("no such console '%s'\n", (char *)value);
+	return(CMD_ERROR);
+    }
+
+    /* disable all current consoles */
+    for (cons = 0; consoles[cons] != NULL; cons++)
+	consoles[cons]->c_flags &= ~(C_ACTIVEIN | C_ACTIVEOUT);
+    
+    /* enable selected console */
+    consoles[active]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT;
+    
+    env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
+    return(CMD_OK);
+}