mirror of https://github.com/ipxe/ipxe.git
142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
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* Copyright (C) 2006 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <string.h>
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#include <ipxe/list.h>
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#include <ipxe/tables.h>
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#include <ipxe/init.h>
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#include <ipxe/interface.h>
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#include <ipxe/device.h>
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/**
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* @file
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*
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* Device model
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*
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*/
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/** Registered root devices */
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static LIST_HEAD ( devices );
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/** Device removal inhibition counter */
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int device_keep_count = 0;
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/**
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* Probe a root device
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*
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* @v rootdev Root device
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* @ret rc Return status code
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*/
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static int rootdev_probe ( struct root_device *rootdev ) {
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int rc;
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DBG ( "Adding %s root bus\n", rootdev->dev.name );
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if ( ( rc = rootdev->driver->probe ( rootdev ) ) != 0 ) {
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DBG ( "Failed to add %s root bus: %s\n",
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rootdev->dev.name, strerror ( rc ) );
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return rc;
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}
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return 0;
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}
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/**
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* Remove a root device
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*
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* @v rootdev Root device
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*/
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static void rootdev_remove ( struct root_device *rootdev ) {
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rootdev->driver->remove ( rootdev );
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DBG ( "Removed %s root bus\n", rootdev->dev.name );
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}
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/**
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* Probe all devices
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*
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* This initiates probing for all devices in the system. After this
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* call, the device hierarchy will be populated, and all hardware
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* should be ready to use.
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*/
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static void probe_devices ( void ) {
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struct root_device *rootdev;
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int rc;
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for_each_table_entry ( rootdev, ROOT_DEVICES ) {
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list_add ( &rootdev->dev.siblings, &devices );
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INIT_LIST_HEAD ( &rootdev->dev.children );
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if ( ( rc = rootdev_probe ( rootdev ) ) != 0 )
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list_del ( &rootdev->dev.siblings );
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}
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}
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/**
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* Remove all devices
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*
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*/
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static void remove_devices ( int booting __unused ) {
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struct root_device *rootdev;
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struct root_device *tmp;
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if ( device_keep_count != 0 ) {
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DBG ( "Refusing to remove devices on shutdown\n" );
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return;
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}
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list_for_each_entry_safe ( rootdev, tmp, &devices, dev.siblings ) {
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rootdev_remove ( rootdev );
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list_del ( &rootdev->dev.siblings );
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}
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}
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struct startup_fn startup_devices __startup_fn ( STARTUP_NORMAL ) = {
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.name = "devices",
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.startup = probe_devices,
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.shutdown = remove_devices,
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};
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/**
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* Identify a device behind an interface
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*
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* @v intf Interface
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* @ret device Device, or NULL
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*/
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struct device * identify_device ( struct interface *intf ) {
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struct interface *dest;
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identify_device_TYPE ( void * ) *op =
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intf_get_dest_op ( intf, identify_device, &dest );
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void *object = intf_object ( dest );
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void *device;
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if ( op ) {
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device = op ( object );
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} else {
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/* Default is to return NULL */
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device = NULL;
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}
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intf_put ( dest );
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return device;
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}
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