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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/wrap.h>
#include <gpxe/interface.h>
/** @file
*
* Object communication interfaces
*
*/
/**
* Plug an interface into a new destination interface
*
* @v intf Interface
* @v dest New destination interface
*
* The reference to the existing destination interface is dropped, a
* reference to the new destination interface is obtained, and the
* interface is updated to point to the new destination interface.
*
* Note that there is no "unplug" call; instead you must plug the
* interface into a null interface.
*/
void plug ( struct interface *intf, struct interface *dest ) {
DBGC ( intf, "INTF %p moving from INTF %p to INTF %p\n",
intf, intf->dest, dest );
intf_put ( intf->dest );
intf->dest = intf_get ( dest );
}
/**
* Plug two interfaces together
*
* @v a Interface A
* @v b Interface B
*
* Plugs interface A into interface B, and interface B into interface
* A. (The basic plug() function is unidirectional; this function is
* merely a shorthand for two calls to plug(), hence the name.)
*/
void plug_plug ( struct interface *a, struct interface *b ) {
plug ( a, b );
plug ( b, a );
}
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