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/*
* Copyright (C) 2006 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 <string.h>
#include <stdio.h>
#include <errno.h>
#include <gpxe/netdevice.h>
#include <gpxe/dhcp.h>
#include <gpxe/image.h>
#include <usr/ifmgmt.h>
#include <usr/route.h>
#include <usr/dhcpmgmt.h>
#include <usr/imgmgmt.h>
#include <usr/autoboot.h>
/** @file
*
* Automatic booting
*
*/
/**
* Identify the boot network device
*
* @ret netdev Boot network device
*/
static struct net_device * find_boot_netdev ( void ) {
return NULL;
}
/**
* Get the next network device to try
*
* @ret netdev 'Next' network device
*
* This function will cycle through all registered network devices in
* order, returning NULL.
*
* This function should be safe against registration/deregistration of
* net devices between calls to next_netdev().
*/
static struct net_device * next_netdev ( void ) {
static struct net_device *last_netdev = NULL;
struct net_device *netdev;
for_each_netdev ( netdev ) {
if ( ! last_netdev ) {
last_netdev = netdev;
return netdev;
}
if ( last_netdev == netdev )
last_netdev = NULL;
}
last_netdev = NULL;
return NULL;
}
/**
* Boot from a network device
*
* @v netdev Network device
*/
void netboot ( struct net_device *netdev ) {
char filename[256];
struct image *image;
int rc;
/* Open device and display device status */
if ( ( rc = ifopen ( netdev ) ) != 0 )
return;
ifstat ( netdev );
/* Configure device via DHCP */
if ( ( rc = dhcp ( netdev ) ) != 0 )
return;
route();
/* Try to download and boot whatever we are given as a filename */
dhcp_snprintf ( filename, sizeof ( filename ),
find_global_dhcp_option ( DHCP_BOOTFILE_NAME ) );
if ( ! filename[0] ) {
printf ( "No boot filename\n" );
return;
}
printf ( "Booting \"%s\"\n", filename );
if ( ( rc = imgfetch ( filename, NULL, &image ) ) != 0 ) {
printf ( "Could not retrieve %s: %s\n",
filename, strerror ( rc ) );
return;
}
if ( ( rc = imgload ( image ) ) != 0 ) {
printf ( "Could not load %s: %s\n", image->name,
strerror ( rc ) );
return;
}
if ( ( rc = imgexec ( image ) ) != 0 ) {
printf ( "Could not execute %s: %s\n", image->name,
strerror ( rc ) );
return;
}
}
/**
* Close all open net devices
*
* Called before a fresh boot attempt in order to free up memory. We
* don't just close the device immediately after the boot fails,
* because there may still be TCP connections in the process of
* closing.
*/
static void close_all_netdevs ( void ) {
struct net_device *netdev;
for_each_netdev ( netdev ) {
ifclose ( netdev );
}
}
/**
* Boot the system
*/
void autoboot ( void ) {
struct net_device *boot_netdev;
struct net_device *netdev;
/* If we have an identifable boot device, try that first */
close_all_netdevs();
if ( ( boot_netdev = find_boot_netdev() ) )
netboot ( boot_netdev );
/* If that fails, try booting from any of the other devices */
for_each_netdev ( netdev ) {
if ( netdev == boot_netdev )
continue;
close_all_netdevs();
netboot ( netdev );
}
printf ( "No more network devices\n" );
}
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