Added generic device model.

src/core/device.c

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2006 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 <gpxe/list.h>
+#include <gpxe/tables.h>
+#include <gpxe/device.h>
+
+/**
+ * @file
+ *
+ * Device model
+ *
+ */
+
+static struct root_device root_devices[0] __table_start ( root_devices );
+static struct root_device root_devices_end[0] __table_end ( root_devices );
+
+/** Registered root devices */
+static LIST_HEAD ( devices );
+
+/**
+ * Register a root device
+ *
+ * @v rootdev		Root device
+ * @ret rc		Return status code
+ *
+ * Calls the root device driver's probe() method, and adds it to the
+ * list of registered root devices if successful.
+ */
+static int register_rootdev ( struct root_device *rootdev ) {
+	int rc;
+
+	DBG ( "Registering %s root bus\n", rootdev->name );
+
+	if ( ( rc = rootdev->driver->probe ( rootdev ) ) != 0 )
+		return rc;
+
+	list_add ( &rootdev->dev.siblings, &devices );
+	return 0;
+}
+
+/**
+ * Unregister a root device
+ *
+ * @v rootdev		Root device
+ */
+static void unregister_rootdev ( struct root_device *rootdev ) {
+	rootdev->driver->remove ( rootdev );
+	list_del ( &rootdev->dev.siblings );
+	DBG ( "Unregistered %s root bus\n", rootdev->name );
+}
+
+/**
+ * Probe all devices
+ *
+ * @ret rc		Return status code
+ *
+ * This initiates probing for all devices in the system.  After this
+ * call, the device hierarchy will be populated, and all hardware
+ * should be ready to use.
+ */
+int probe_devices ( void ) {
+	struct root_device *rootdev;
+
+	for ( rootdev = root_devices; rootdev < root_devices_end; rootdev++ ) {
+		register_rootdev ( rootdev );
+	}
+	return 0;
+}
+
+/**
+ * Remove all devices
+ *
+ */
+void remove_devices ( void ) {
+	struct root_device *rootdev;
+	struct root_device *tmp;
+
+	list_for_each_entry_safe ( rootdev, tmp, &devices, dev.siblings ) {
+		unregister_rootdev ( rootdev );
+	}
+}