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- /*
- * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #include <gpxe/device.h>
- #include <gpxe/init.h>
-
- /** @file
- *
- * Initialisation, startup and shutdown routines
- *
- */
-
- /** Registered initialisation functions */
- static struct init_fn init_fns[0]
- __table_start ( struct init_fn, init_fns );
- static struct init_fn init_fns_end[0]
- __table_end ( struct init_fn, init_fns );
-
- /** Registered startup/shutdown functions */
- static struct startup_fn startup_fns[0]
- __table_start ( struct startup_fn, startup_fns );
- static struct startup_fn startup_fns_end[0]
- __table_end ( struct startup_fn, startup_fns );
-
- /** "startup() has been called" flag */
- static int started = 0;
-
- /**
- * Initialise gPXE
- *
- * 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 ( init_fn = init_fns ; init_fn < init_fns_end ; init_fn++ ) {
- init_fn->initialise ();
- }
- }
-
- /**
- * Start up gPXE
- *
- * 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 ( startup_fn = startup_fns ; startup_fn < startup_fns_end ;
- startup_fn++ ) {
- if ( startup_fn->startup )
- startup_fn->startup();
- }
-
- started = 1;
- }
-
- /**
- * Shut down gPXE
- *
- * @v flags Shutdown behaviour flags
- *
- * This function reverses the actions of startup(), and leaves gPXE 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 ( startup_fn = startup_fns_end - 1 ; startup_fn >= startup_fns ;
- startup_fn-- ) {
- if ( startup_fn->shutdown )
- startup_fn->shutdown ( flags );
- }
-
- started = 0;
- }
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