Added generic device model.

src/include/gpxe/device.h

@@ -0,0 +1,70 @@
+#ifndef _GPXE_DEVICE_H
+#define _GPXE_DEVICE_H
+
+/**
+ * @file
+ *
+ * Device model
+ *
+ */
+
+#include <gpxe/list.h>
+#include <gpxe/tables.h>
+
+/** A hardware device */
+struct device {
+	/** Devices on the same bus */
+	struct list_head siblings;
+	/** Devices attached to this device */
+	struct list_head children;
+	/** Bus device */
+	struct device *parent;
+};
+
+/**
+ * A root device
+ *
+ * Root devices are system buses such as PCI, EISA, etc.
+ *
+ */
+struct root_device {
+	/** Name */
+	const char *name;
+	/** Device chain
+	 *
+	 * A root device has a NULL parent field.
+	 */
+	struct device dev;
+	/** Root device driver */
+	struct root_driver *driver;
+};
+
+/** A root device driver */
+struct root_driver {
+	/**
+	 * Add root device
+	 *
+	 * @v rootdev	Root device
+	 * @ret rc	Return status code
+	 *
+	 * Called from probe_devices() for all root devices in the build.
+	 */
+	int ( * probe ) ( struct root_device *rootdev );
+	/**
+	 * Remove root device
+	 *
+	 * @v rootdev	Root device
+	 *
+	 * Called from remove_device() for all successfully-probed
+	 * root devices.
+	 */
+	void ( * remove ) ( struct root_device *rootdev );
+};
+
+/** Declare a root device */
+#define __root_device __table ( root_devices, 01 )
+
+extern int probe_devices ( void );
+extern void remove_devices ( void );
+
+#endif /* _GPXE_DEVICE_H */