text: /*
   * 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., 51 Franklin Street, Fifth Floor, Boston, MA
   * 02110-1301, USA.
   *
   * You can also choose to distribute this program under the terms of
   * the Unmodified Binary Distribution Licence (as given in the file
   * COPYING.UBDL), provided that you have satisfied its requirements.
   */
  
  FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
  
  #include <ipxe/device.h>
  #include <ipxe/console.h>
  #include <ipxe/init.h>
  
  /** @file
   *
   * Initialisation, startup and shutdown routines
   *
   */
  
  /** "startup() has been called" flag */
  static int started = 0;
  
  /** Colour for debug messages */
  #define colour table_start ( INIT_FNS )
  
  /**
   * Initialise iPXE
   *
   * This function performs the one-time-only and irreversible
   * initialisation steps, such as initialising the heap.  It must be
   * called before (almost) any other function.
   *
   * There is, by definition, no counterpart to this function on the
   * shutdown path.
   */
  void initialise ( void ) {
  	struct init_fn *init_fn;
  
  	/* Call registered initialisation functions */
  	for_each_table_entry ( init_fn, INIT_FNS )
  		init_fn->initialise ();
  }
  
  /**
   * Start up iPXE
   *
   * This function performs the repeatable initialisation steps, such as
   * probing devices.  You may call startup() and shutdown() multiple
   * times (as is done via the PXE API when PXENV_START_UNDI is used).
   */
  void startup ( void ) {
  	struct startup_fn *startup_fn;
  
  	if ( started )
  		return;
  
  	/* Call registered startup functions */
  	for_each_table_entry ( startup_fn, STARTUP_FNS ) {
  		if ( startup_fn->startup ) {
  			DBGC ( colour, "INIT startup %s...\n",
  			       startup_fn->name );
  			startup_fn->startup();
  		}
  	}
  
  	started = 1;
  	DBGC ( colour, "INIT startup complete\n" );
  }
  
  /**
   * Shut down iPXE
   *
   * @v flags		Shutdown behaviour flags
   *
   * This function reverses the actions of startup(), and leaves iPXE in
   * a state ready to be removed from memory.  You may call startup()
   * again after calling shutdown().
   *
   * Call this function only once, before either exiting main() or
   * starting up a non-returnable image.
   */
  void shutdown ( int flags ) {
  	struct startup_fn *startup_fn;
  
  	if ( ! started )
  		return;
  
  	/* Call registered shutdown functions (in reverse order) */
  	for_each_table_entry_reverse ( startup_fn, STARTUP_FNS ) {
  		if ( startup_fn->shutdown ) {
  			DBGC ( colour, "INIT shutdown %s...\n",
  			       startup_fn->name );
  			startup_fn->shutdown ( flags );
  		}
  	}
  
  	/* Reset console */
  	console_reset();
  
  	started = 0;
  	DBGC ( colour, "INIT shutdown complete\n" );
  }
  