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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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <gpxe/device.h>
#include <gpxe/init.h>
/** @file
*
* Initialisation, startup and shutdown routines
*
*/
/** "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_each_table_entry ( init_fn, INIT_FNS )
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_each_table_entry ( startup_fn, STARTUP_FNS ) {
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_each_table_entry_reverse ( startup_fn, STARTUP_FNS ) {
if ( startup_fn->shutdown )
startup_fn->shutdown ( flags );
}
started = 0;
}
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