101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
/*
|
|
* \brief Generic implementation of pager entrypoint
|
|
* \author Norman Feske
|
|
* \author Stefan Kalkowski
|
|
* \date 2009-03-31
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2009-2015 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.
|
|
*/
|
|
|
|
/* Core includes */
|
|
#include <pager.h>
|
|
|
|
using namespace Genode;
|
|
|
|
|
|
void Pager_entrypoint::entry()
|
|
{
|
|
using Pool = Object_pool<Pager_object>;
|
|
|
|
bool reply_pending = false;
|
|
|
|
while (1) {
|
|
|
|
if (reply_pending)
|
|
_pager.reply_and_wait_for_fault();
|
|
else
|
|
_pager.wait_for_fault();
|
|
|
|
reply_pending = false;
|
|
|
|
Pool::apply(_pager.badge(), [&] (Pager_object *obj) {
|
|
if (obj) {
|
|
if (_pager.is_exception())
|
|
obj->submit_exception_signal();
|
|
else
|
|
/* send reply if page-fault handling succeeded */
|
|
reply_pending = !obj->pager(_pager);
|
|
} else {
|
|
|
|
/*
|
|
* Prevent threads outside of core to mess with our wake-up
|
|
* interface. This condition can trigger if a process gets
|
|
* destroyed which triggered a page fault shortly before getting
|
|
* killed. In this case, 'wait_for_fault()' returns (because of
|
|
* the page fault delivery) but the pager-object lookup will fail
|
|
* (because core removed the process already).
|
|
*/
|
|
if (_pager.request_from_core()) {
|
|
|
|
/*
|
|
* We got a request from one of cores region-manager sessions
|
|
* to answer the pending page fault of a resolved region-manager
|
|
* client. Hence, we have to send the page-fault reply to the
|
|
* specified thread and answer the call of the region-manager
|
|
* session.
|
|
*
|
|
* When called from a region-manager session, we receive the
|
|
* core-local address of the targeted pager object via the
|
|
* first message word, which corresponds to the 'fault_ip'
|
|
* argument of normal page-fault messages.
|
|
*/
|
|
obj = reinterpret_cast<Pager_object *>(_pager.fault_ip());
|
|
|
|
/* send reply to the calling region-manager session */
|
|
_pager.acknowledge_wakeup();
|
|
|
|
/* answer page fault of resolved pager object */
|
|
_pager.set_reply_dst(obj->cap());
|
|
_pager.acknowledge_wakeup();
|
|
}
|
|
}
|
|
});
|
|
}
|
|
}
|
|
|
|
|
|
void Pager_entrypoint::dissolve(Pager_object *obj)
|
|
{
|
|
using Pool = Object_pool<Pager_object>;
|
|
|
|
if (obj) Pool::remove(obj);
|
|
}
|
|
|
|
|
|
Pager_capability Pager_entrypoint::manage(Pager_object *obj)
|
|
{
|
|
Native_capability cap = _pager_object_cap(obj->badge());
|
|
|
|
/* add server object to object pool */
|
|
obj->cap(cap);
|
|
insert(obj);
|
|
|
|
/* return capability that uses the object id as badge */
|
|
return reinterpret_cap_cast<Pager_object>(cap);
|
|
}
|