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Separated out initialisation functions from startup/shutdown functions.
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Michael Brown
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Jul 3, 2007
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Original file line number | Diff line number | Diff line change |
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@@ -1,37 +1,117 @@ | ||
/************************************************************************** | ||
* call_{init,reset,exit}_fns () | ||
* | ||
* Call the various initialisation and exit functions. We use a | ||
* function table so that we don't end up dragging in an object just | ||
* because we call its initialisation function. | ||
************************************************************************** | ||
/* | ||
* 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. | ||
*/ | ||
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#include <gpxe/device.h> | ||
#include <gpxe/init.h> | ||
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/** @file | ||
* | ||
* Initialisation, startup and shutdown routines | ||
* | ||
*/ | ||
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/** Registered initialisation functions */ | ||
static struct init_fn init_fns[0] | ||
__table_start ( struct init_fn, init_fn ); | ||
__table_start ( struct init_fn, init_fns ); | ||
static struct init_fn init_fns_end[0] | ||
__table_end ( struct init_fn, init_fn ); | ||
__table_end ( struct init_fn, init_fns ); | ||
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/** 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 ); | ||
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void call_init_fns ( void ) { | ||
/** "startup() has been called" flag */ | ||
static int started = 0; | ||
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/** | ||
* 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; | ||
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for ( init_fn = init_fns; init_fn < init_fns_end ; init_fn++ ) { | ||
if ( init_fn->init ) | ||
init_fn->init (); | ||
/* Call registered initialisation functions */ | ||
for ( init_fn = init_fns ; init_fn < init_fns_end ; init_fn++ ) { | ||
init_fn->initialise (); | ||
} | ||
} | ||
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void call_exit_fns ( void ) { | ||
struct init_fn *init_fn; | ||
/** | ||
* 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; | ||
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if ( started ) | ||
return; | ||
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/* Call registered startup functions */ | ||
for ( startup_fn = startup_fns ; startup_fn < startup_fns_end ; | ||
startup_fn++ ) { | ||
if ( startup_fn->startup ) | ||
startup_fn->startup(); | ||
} | ||
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/* | ||
* Exit functions are called in reverse order to | ||
* initialisation functions. | ||
/* Probe for all devices. Treated separately because nothing | ||
* else will drag in device.o | ||
*/ | ||
for ( init_fn = init_fns_end - 1; init_fn >= init_fns ; init_fn-- ) { | ||
if ( init_fn->exit ) | ||
init_fn->exit (); | ||
probe_devices(); | ||
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started = 1; | ||
} | ||
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/** | ||
* Shut down gPXE | ||
* | ||
* 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 ( void ) { | ||
struct startup_fn *startup_fn; | ||
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if ( ! started ) | ||
return; | ||
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/* Remove all devices */ | ||
remove_devices(); | ||
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/* 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(); | ||
} | ||
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started = 0; | ||
} |
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