118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
/*
|
|
* \brief Fiasco pager framework
|
|
* \author Norman Feske
|
|
* \author Christian Helmuth
|
|
* \date 2006-07-14
|
|
*
|
|
* FIXME Isn't this file generic?
|
|
*/
|
|
|
|
/*
|
|
* 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/pager.h>
|
|
|
|
namespace Fiasco {
|
|
#include <l4/sys/ipc.h>
|
|
#include <l4/sys/syscalls.h>
|
|
}
|
|
|
|
using namespace Genode;
|
|
|
|
|
|
/**********************
|
|
** Pager activation **
|
|
**********************/
|
|
|
|
void Pager_activation_base::entry()
|
|
{
|
|
Ipc_pager pager;
|
|
_cap = pager;
|
|
_cap_valid.unlock();
|
|
|
|
pager.wait_for_fault();
|
|
while (1) {
|
|
|
|
/* lookup referenced object */
|
|
Pager_object *obj = _ep ? _ep->obj_by_id(pager.badge()) : 0;
|
|
|
|
/* handle request */
|
|
if (obj) {
|
|
if (obj->pager(pager))
|
|
/* something strange occured - leave thread in pagefault */
|
|
pager.wait_for_fault();
|
|
else
|
|
pager.reply_and_wait_for_fault();
|
|
} else {
|
|
|
|
/* prevent threads outside of core to mess with our wake-up interface */
|
|
enum { CORE_TASK_ID = 4 };
|
|
if (pager.last().id.task != CORE_TASK_ID) {
|
|
|
|
PWRN("page fault from unknown partner %x.%02x",
|
|
(int)pager.last().id.task, (int)pager.last().id.lthread);
|
|
|
|
} else {
|
|
|
|
/*
|
|
* 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();
|
|
}
|
|
pager.wait_for_fault();
|
|
}
|
|
};
|
|
}
|
|
|
|
|
|
/**********************
|
|
** Pager entrypoint **
|
|
**********************/
|
|
|
|
Pager_entrypoint::Pager_entrypoint(Cap_session *, Pager_activation_base *a)
|
|
: _activation(a)
|
|
{ _activation->ep(this); }
|
|
|
|
|
|
void Pager_entrypoint::dissolve(Pager_object *obj)
|
|
{
|
|
remove(obj);
|
|
}
|
|
|
|
|
|
Pager_capability Pager_entrypoint::manage(Pager_object *obj)
|
|
{
|
|
/* return invalid capability if no activation is present */
|
|
if (!_activation) return Pager_capability();
|
|
|
|
Native_thread_id tid = _activation->cap().tid();
|
|
Native_capability cap(_activation->cap().tid(), 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);
|
|
}
|