From d606edb41dc0df82ea4f6bc23296720d37d6fe84 Mon Sep 17 00:00:00 2001
From: Michael Brown <mcb30@etherboot.org>
Date: Tue, 9 Jan 2007 03:20:22 +0000
Subject: [PATCH] Added UNDI root bus driver (which saves including all the PCI
 bus code, UNDI ROM code etc. when you just want a "undi.kpxe"-type image).

This driver cannot be used in conjunction with any other driver (it will
crash), or in any other format than .kpxe (it just won't find any network
devices).
---
 src/arch/i386/drivers/net/undionly.c | 96 ++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/arch/i386/drivers/net/undionly.c

diff --git a/src/arch/i386/drivers/net/undionly.c b/src/arch/i386/drivers/net/undionly.c
new file mode 100644
index 00000000..5b8ff977
--- /dev/null
+++ b/src/arch/i386/drivers/net/undionly.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <gpxe/device.h>
+#include <undi.h>
+#include <undinet.h>
+#include <undipreload.h>
+
+/** @file
+ *
+ * "Pure" UNDI driver
+ *
+ * This is the UNDI driver without explicit support for PCI or any
+ * other bus type.  It is capable only of using the preloaded UNDI
+ * device.  It must not be combined in an image with any other
+ * drivers.
+ *
+ * If you want a PXE-loadable image that contains only the UNDI
+ * driver, build "bin/undionly.kpxe".
+ *
+ * If you want any other image format, or any other drivers in
+ * addition to the UNDI driver, build e.g. "bin/undi.dsk".
+ */
+
+/**
+ * Probe UNDI root bus
+ *
+ * @v rootdev		UNDI bus root device
+ *
+ * Scans the UNDI bus for devices and registers all devices it can
+ * find.
+ */
+static int undibus_probe ( struct root_device *rootdev ) {
+	int rc;
+
+	/* Check for a valie preloaded UNDI device */
+	if ( ! preloaded_undi.entry.segment ) {
+		DBG ( "No preloaded UNDI device found!\n" );
+		return -ENODEV;
+	}
+
+	/* Add to device hierarchy */
+	preloaded_undi.dev.parent = &rootdev->dev;
+	list_add ( &preloaded_undi.dev.siblings, &rootdev->dev.children);
+	INIT_LIST_HEAD ( &preloaded_undi.dev.children );
+
+	/* Create network device */
+	if ( ( rc = undinet_probe ( &preloaded_undi ) ) != 0 )
+		goto err;
+
+	return 0;
+
+ err:
+	list_del ( &preloaded_undi.dev.siblings );
+	return rc;
+}
+
+/**
+ * Remove UNDI root bus
+ *
+ * @v rootdev		UNDI bus root device
+ */
+static void undibus_remove ( struct root_device *rootdev __unused ) {
+	undinet_remove ( &preloaded_undi );
+	list_del ( &preloaded_undi.dev.siblings );
+}
+
+/** UNDI bus root device driver */
+static struct root_driver undi_root_driver = {
+	.probe = undibus_probe,
+	.remove = undibus_remove,
+};
+
+/** UNDI bus root device */
+struct root_device undi_root_device __root_device = {
+	.name = "UNDI",
+	.driver = &undi_root_driver,
+};