123 lines
2.8 KiB
C++
123 lines
2.8 KiB
C++
/*
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* \brief Fiasco pager framework
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* \author Norman Feske
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* \author Christian Helmuth
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* \date 2006-07-14
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*
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* FIXME Isn't this file generic?
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*/
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/*
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* Copyright (C) 2006-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <base/pager.h>
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namespace Fiasco {
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#include <l4/sys/ipc.h>
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#include <l4/sys/syscalls.h>
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}
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using namespace Genode;
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/**********************
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** Pager activation **
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**********************/
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void Pager_activation_base::entry()
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{
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Ipc_pager pager;
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_cap = pager;
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_cap_valid.unlock();
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Pager_object * obj;
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bool reply = false;
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while (1) {
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if (reply)
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pager.reply_and_wait_for_fault();
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else
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pager.wait_for_fault();
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/* lookup referenced object */
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Object_pool<Pager_object>::Guard _obj(_ep ? _ep->lookup_and_lock(pager.badge()) : 0);
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obj = _obj;
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reply = false;
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/* handle request */
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if (obj) {
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reply = !obj->pager(pager);
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/* something strange occurred - leave thread in pagefault */
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continue;
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} else {
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/* prevent threads outside of core to mess with our wake-up interface */
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enum { CORE_TASK_ID = 4 };
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if (pager.last().id.task != CORE_TASK_ID) {
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PWRN("page fault from unknown partner %x.%02x",
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(int)pager.last().id.task, (int)pager.last().id.lthread);
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} else {
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/*
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* We got a request from one of cores region-manager sessions
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* to answer the pending page fault of a resolved region-manager
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* client. Hence, we have to send the page-fault reply to the
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* specified thread and answer the call of the region-manager
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* session.
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*
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* When called from a region-manager session, we receive the
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* core-local address of the targeted pager object via the
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* first message word, which corresponds to the 'fault_ip'
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* argument of normal page-fault messages.
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*/
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obj = reinterpret_cast<Pager_object *>(pager.fault_ip());
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/* send reply to the calling region-manager session */
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pager.acknowledge_wakeup();
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/* answer page fault of resolved pager object */
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pager.set_reply_dst(obj->cap());
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pager.acknowledge_wakeup();
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}
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}
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};
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}
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/**********************
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** Pager entrypoint **
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**********************/
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Pager_entrypoint::Pager_entrypoint(Cap_session *, Pager_activation_base *a)
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: _activation(a)
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{ _activation->ep(this); }
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void Pager_entrypoint::dissolve(Pager_object *obj)
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{
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remove_locked(obj);
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}
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Pager_capability Pager_entrypoint::manage(Pager_object *obj)
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{
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/* return invalid capability if no activation is present */
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if (!_activation) return Pager_capability();
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Native_capability cap(_activation->cap().dst(), obj->badge());
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/* add server object to object pool */
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obj->cap(cap);
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insert(obj);
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/* return capability that uses the object id as badge */
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return reinterpret_cap_cast<Pager_object>(cap);
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}
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