Init

sys/boot/lib/common/init_devsw.c

@@ -0,0 +1,161 @@
+#if !defined(lint) && !defined(BOOTBLOCK)
+static char sccsid[] = "@(#)init_devsw.c 1.1 94/10/31 SMI";
+#endif
+
+/*
+ * Copyright (c) 1988 Sun Microsystems, Inc.
+ *
+ * Devswitch support routines for the Open Boot Proms.
+ *
+ */
+
+#include <sys/param.h>
+#include <sun/autoconf.h>
+#include <sun/openprom.h>
+#include <mon/sunromvec.h>
+#include <string.h>
+#include "boot/conf.h"
+
+#define	NEXT		prom_nextnode
+#define	CHILD		prom_childnode
+extern char *getlongprop();
+
+char bdevnames[8][3];		/* 3 chars each (2 letters and Null) */
+
+extern struct boottab *(devsw[]);
+extern struct bdevlist bdevlist[];
+extern struct boottab blkdriver, tapedriver, ifdriver;
+extern struct ndevlist ndevlist[];
+
+/*
+ * Initial indices for the devsw[] and bdevlist[]. Note that the bdevlist[]
+ * has to start at entry [1]! Device [0] is defined to be NODEV and
+ * the open routine fails.
+ */
+static int dev = 0;
+static int bdev = 1;
+
+#ifndef sun4m
+static void walk(), check_this_node(), add_to_devsw();
+#else
+static void add_to_devsw();
+#endif !sun4m
+
+/*
+ * At run time, walk the dev_info structure in the monitor and find all
+ * "block", "byte", and "network" devices. Fill in the devsw and bdevlist
+ * tables with their names and driver entry points.
+ */
+
+init_devsw()
+{
+	if (prom_getversion() > 0)
+		return (init_devlist());
+
+#ifndef sun4m
+	walk(NEXT(0));		/* Get the root node */
+#endif !sun4m
+}
+
+#ifndef sun4m
+/*
+ * CS201: Data Structures. MWF 11:00-11:50 Wilmot 214. 4 credits. Grade: B-
+ */
+static void
+walk(id)
+	int id;
+{
+	register int curnode;
+	register char *c;
+	register char *s;
+
+	if (id)
+		check_this_node(id);
+	if (curnode = CHILD(id))
+		walk(curnode);
+	if (curnode = NEXT(id))
+		walk(curnode);
+}
+
+
+static void
+check_this_node(id)
+	int id;
+{
+	register char *name, *type;
+	register char *s1, *s2;
+	char	*dupstring();
+
+	type = name = (char *)0;
+	name = getlongprop(id, "name");
+	if (((int)name == 0) || ((int)name == -1))
+		return;
+	type = getlongprop(id, "device_type");
+	if ((int)type == -1)
+		type = (char *)0;
+	if (strncmp(type, "block", 5) == 0) {
+		add_to_devsw(name, &blkdriver, dev);
+		(void)strncpy(bdevnames[bdev], name, 3);
+		bdevlist[bdev].bl_name = bdevnames[bdev];
+		bdevlist[bdev].bl_root = makedev(bdev, 0);
+		bdevlist[bdev++].bl_driver = devsw[dev++];
+	} else if (strncmp(type, "byte", 4) == 0) {
+		add_to_devsw(name, &tapedriver, dev);
+		(void)strncpy(bdevnames[bdev], name, 3);
+		bdevlist[bdev].bl_name = bdevnames[bdev];
+		bdevlist[bdev].bl_root = makedev(bdev, 0);
+		bdevlist[bdev++].bl_driver = devsw[dev++];
+	} else if (strncmp(type, "network", 7) == 0) {
+		add_to_devsw(name, &ifdriver, dev++);
+	}
+}
+#endif !sun4m
+
+static void
+add_to_devsw(name, driver, i)
+	char *name;
+	struct boottab *driver;
+	int i;
+{
+	register struct boottab *bp;
+
+	bp = (struct boottab *)kmem_alloc(sizeof (struct boottab));
+	if (bp == 0)
+		_stop("kmem_alloc: couldn't get space");
+	*bp = *driver;
+	/*
+	 * b_dev has only 2 characters for the device name whinch is
+	 * not enough space for the OBP full path.  For OBP interface,
+	 * tempararily use b_desc field to keep the full path name
+	 */
+	if (prom_getversion() > 0) {
+		bp->b_dev[0] = '\0';
+		bp->b_desc = name;
+	} else
+		(void)strncpy(bp->b_dev, name, 2);
+	devsw[i] = bp;
+}
+
+init_devlist()
+{
+
+	register	char	*name;
+
+	name = (char *)kmem_alloc(128);
+	if (name == 0)
+		_stop("kmem_alloc: couldn't get space");
+	bzero((caddr_t)name, 128);
+	add_to_devsw(name, &blkdriver, dev);
+	bdevlist[1].bl_name = name;
+	bdevlist[1].bl_root = makedev(1, 0);
+	bdevlist[1].bl_driver = devsw[dev++];
+
+	name = (char *)kmem_alloc(128);
+	if (name == 0)
+		_stop("kmem_alloc: couldn't get space");
+	bzero((caddr_t)name, 128);
+	add_to_devsw(name, &ifdriver, dev);
+	ndevlist[0].nl_name = name;
+	ndevlist[0].nl_root = 0;
+	ndevlist[0].nl_driver = devsw[dev++];
+}