gpxe/src/include/gpxe/init.h

#ifndef _GPXE_INIT_H
#define _GPXE_INIT_H

FILE_LICENCE ( GPL2_OR_LATER );

#include <gpxe/tables.h>

/**
 * An initialisation function
 *
 * Initialisation functions are called exactly once, as part of the
 * call to initialise().
 */
struct init_fn {
	void ( * initialise ) ( void );
};

/** Initialisation function table */
#define INIT_FNS __table ( struct init_fn, "init_fns" )

/** Declare an initialisation functon */
#define __init_fn( init_order ) __table_entry ( INIT_FNS, init_order )

/** @defgroup initfn_order Initialisation function ordering
 * @{
 */

#define INIT_EARLY	01	/**< Early initialisation */
#define INIT_SERIAL	02	/**< Serial driver initialisation */
#define	INIT_CONSOLE	03	/**< Console initialisation */
#define INIT_NORMAL	04	/**< Normal initialisation */

/** @} */

/** Shutdown flags */
enum shutdown_flags {
	/** Shutdown is in order to exit (return to gPXE's caller) */
	SHUTDOWN_EXIT = 0x0001,
	/** Shutdown is in order to boot an OS */
	SHUTDOWN_BOOT = 0x0002,
	/** Do not remove devices */
	SHUTDOWN_KEEP_DEVICES = 0x0004,
};

/**
 * A startup/shutdown function
 *
 * Startup and shutdown functions may be called multiple times, as
 * part of the calls to startup() and shutdown().
 */
struct startup_fn {
	void ( * startup ) ( void );
	void ( * shutdown ) ( int flags );
};

/** Startup/shutdown function table */
#define STARTUP_FNS __table ( struct startup_fn, "startup_fns" )

/** Declare a startup/shutdown function */
#define __startup_fn( startup_order ) \
	__table_entry ( STARTUP_FNS, startup_order )

/** @defgroup startfn_order Startup/shutdown function ordering
 *
 * Shutdown functions are called in the reverse order to startup
 * functions.
 *
 * @{
 */

#define STARTUP_EARLY	01	/**< Early startup */
#define STARTUP_NORMAL	02	/**< Normal startup */
#define STARTUP_LATE	03	/**< Late startup */

/** @} */

extern void initialise ( void );
extern void startup ( void );
extern void shutdown ( int flags );

#endif /* _GPXE_INIT_H */