03c80c12b8
Add yet another ugly hack to iscsiboot.c, this time to allow the user to inhibit the shutdown/removal of the iSCSI INT13 device (and the network devices, since they are required for the iSCSI device to function). On the plus side, the fact that shutdown() now takes flags to differentiate between shutdown-for-exit and shutdown-for-boot means that another ugly hack (to allow returning via the PXE stack on BIOSes that have broken INT 18 calls) will be easier. I feel dirty.
112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <gpxe/device.h>
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#include <gpxe/init.h>
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/** @file
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*
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* Initialisation, startup and shutdown routines
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*
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*/
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/** Registered initialisation functions */
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static struct init_fn init_fns[0]
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__table_start ( struct init_fn, init_fns );
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static struct init_fn init_fns_end[0]
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__table_end ( struct init_fn, init_fns );
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/** Registered startup/shutdown functions */
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static struct startup_fn startup_fns[0]
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__table_start ( struct startup_fn, startup_fns );
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static struct startup_fn startup_fns_end[0]
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__table_end ( struct startup_fn, startup_fns );
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/** "startup() has been called" flag */
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static int started = 0;
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/**
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* Initialise gPXE
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*
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* This function performs the one-time-only and irreversible
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* initialisation steps, such as initialising the heap. It must be
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* called before (almost) any other function.
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*
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* There is, by definition, no counterpart to this function on the
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* shutdown path.
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*/
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void initialise ( void ) {
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struct init_fn *init_fn;
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/* Call registered initialisation functions */
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for ( init_fn = init_fns ; init_fn < init_fns_end ; init_fn++ ) {
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init_fn->initialise ();
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}
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}
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/**
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* Start up gPXE
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*
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* This function performs the repeatable initialisation steps, such as
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* probing devices. You may call startup() and shutdown() multiple
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* times (as is done via the PXE API when PXENV_START_UNDI is used).
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*/
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void startup ( void ) {
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struct startup_fn *startup_fn;
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if ( started )
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return;
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/* Call registered startup functions */
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for ( startup_fn = startup_fns ; startup_fn < startup_fns_end ;
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startup_fn++ ) {
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if ( startup_fn->startup )
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startup_fn->startup();
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}
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started = 1;
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}
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/**
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* Shut down gPXE
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*
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* @v flags Shutdown behaviour flags
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*
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* This function reverses the actions of startup(), and leaves gPXE in
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* a state ready to be removed from memory. You may call startup()
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* again after calling shutdown().
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* Call this function only once, before either exiting main() or
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* starting up a non-returnable image.
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*/
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void shutdown ( int flags ) {
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struct startup_fn *startup_fn;
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if ( ! started )
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return;
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/* Call registered shutdown functions (in reverse order) */
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for ( startup_fn = startup_fns_end - 1 ; startup_fn >= startup_fns ;
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startup_fn-- ) {
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if ( startup_fn->shutdown )
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startup_fn->shutdown ( flags );
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}
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started = 0;
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}
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