[autoboot] Add "netboot" command

Originally-implemented-by: michael-dev@fami-braun.de
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/hci/commands/autoboot_cmd.c

 #include <stdio.h>
 #include <ipxe/command.h>
+#include <ipxe/netdevice.h>
 #include <usr/autoboot.h>
 
 FILE_LICENCE ( GPL2_OR_LATER );
 	return 1;
 }
 
-struct command autoboot_command __command = {
-	.name = "autoboot",
-	.exec = autoboot_exec,
+static int netboot_exec ( int argc, char **argv ) {
+	const char *netdev_name;
+	struct net_device *netdev;
+
+	if ( argc != 2 ) {
+		printf ( "Usage:\n"
+			 "  %s <interface>\n"
+			 "\n"
+			 "Attempts to boot the system from <interface>\n",
+			 argv[0] );
+		return 1;
+	}
+	netdev_name = argv[1];
+
+	netdev = find_netdev ( netdev_name );
+	if ( ! netdev ) {
+		printf ( "%s: no such interface\n", netdev_name );
+		return 1;
+	}
+
+	netboot ( netdev );
+
+	/* Can never return success by definition */
+	return 1;
+}
+
+struct command autoboot_commands[] __command = {
+	{
+		.name = "autoboot",
+		.exec = autoboot_exec,
+	},
+	{
+		.name = "netboot",
+		.exec = netboot_exec,
+	},
 };

src/include/usr/autoboot.h

 
 extern int shutdown_exit_flags;
 
+extern int netboot ( struct net_device *netdev );
 extern void autoboot ( void );
 extern int boot_next_server_and_filename ( struct in_addr next_server,
 					   const char *filename );

src/usr/autoboot.c

  * @v netdev		Network device
  * @ret rc		Return status code
  */
-static int netboot ( struct net_device *netdev ) {
+int netboot ( struct net_device *netdev ) {
 	struct setting vendor_class_id_setting
 		= { .tag = DHCP_VENDOR_CLASS_ID };
 	struct setting pxe_discovery_control_setting