/*
 * \brief  Pager support for Fiasco
 * \author Christian Helmuth
 * \date   2006-06-14
 */

/*
 * Copyright (C) 2006-2012 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU General Public License version 2.
 */

#include <base/ipc_pager.h>
#include <base/printf.h>

namespace Fiasco {
#include <l4/sys/ipc.h>
#include <l4/sys/syscalls.h>
}

using namespace Genode;
using namespace Fiasco;


void Ipc_pager::wait_for_fault()
{
	l4_msgdope_t  result;

	do {
		l4_ipc_wait(&_last,
		            L4_IPC_SHORT_MSG, &_pf_addr, &_pf_ip,
		            L4_IPC_NEVER, &result);

		if (L4_IPC_IS_ERROR(result))
			PERR("Ipc error %lx", L4_IPC_ERROR(result));

	} while (L4_IPC_IS_ERROR(result));
}


void Ipc_pager::reply_and_wait_for_fault()
{
	l4_msgdope_t  result;

	l4_ipc_reply_and_wait(_last,
	                      L4_IPC_SHORT_FPAGE, _reply_mapping.dst_addr(),
	                      _reply_mapping.fpage().fpage, &_last,
	                      L4_IPC_SHORT_MSG, &_pf_addr, &_pf_ip,
	                      L4_IPC_SEND_TIMEOUT_0, &result);

	if (L4_IPC_IS_ERROR(result)) {
		PERR("Ipc error %lx", L4_IPC_ERROR(result));

		/* ignore all errors and wait for next proper message */
		wait_for_fault();
	}
}


void Ipc_pager::acknowledge_wakeup()
{
	/* answer wakeup call from one of core's region-manager sessions */
	l4_msgdope_t result;
	l4_ipc_send(_last, L4_IPC_SHORT_MSG, 0, 0, L4_IPC_SEND_TIMEOUT_0, &result);
}


Ipc_pager::Ipc_pager() : Native_capability(Fiasco::l4_myself(), 0) { }