164 lines
3.7 KiB
C++
164 lines
3.7 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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* \author Stefan Kalkowski
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* \date 2006-07-14
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*/
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/*
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* Copyright (C) 2006-2017 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 Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <base/env.h>
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#include <base/log.h>
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#include <base/lock.h>
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/* core includes */
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#include <pager.h>
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/* base-internal includes */
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#include <base/internal/native_thread.h>
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/* Fiasco.OC includes */
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namespace Fiasco {
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#include <l4/sys/factory.h>
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#include <l4/sys/ipc.h>
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}
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using namespace Genode;
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void Pager_entrypoint::entry()
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{
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bool reply_pending = false;
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while (1) {
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if (reply_pending)
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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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reply_pending = false;
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apply(_pager.badge(), [&] (Pager_object *obj) {
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/* the pager_object might be destroyed, while we got the message */
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if (!obj) {
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warning("no pager object found!");
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return;
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}
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switch (_pager.msg_type()) {
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case Ipc_pager::PAGEFAULT:
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case Ipc_pager::EXCEPTION:
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{
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if (_pager.exception()) {
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Lock::Guard guard(obj->state.lock);
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_pager.get_regs(&obj->state);
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obj->state.exceptions++;
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obj->state.in_exception = true;
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obj->submit_exception_signal();
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return;
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}
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/* handle request */
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if (obj->pager(_pager)) {
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/* could not resolv - leave thread in pagefault */
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warning("page-fault, ", *obj,
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" ip=", Hex(_pager.fault_ip()),
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" pf-addr=", Hex(_pager.fault_addr()));
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} else {
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_pager.set_reply_dst(Native_thread(obj->badge()));
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reply_pending = true;
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return;
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}
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break;
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}
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case Ipc_pager::WAKE_UP:
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{
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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, or to resume a previously paused thread. Hence, we
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* have to send a reply to the specified thread and answer the
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* call.
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*/
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/* send reply to the caller */
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_pager.set_reply_dst(Native_thread());
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_pager.acknowledge_wakeup();
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{
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Lock::Guard guard(obj->state.lock);
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/* revert exception flag */
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obj->state.in_exception = false;
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/* set new register contents */
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_pager.set_regs(obj->state);
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}
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/* send wake up message to requested thread */
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_pager.set_reply_dst(Native_thread(obj->badge()));
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_pager.acknowledge_exception();
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break;
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}
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/*
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* Handle exceptions that are artificially generated by the pause
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* function of the CPU service.
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*/
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case Ipc_pager::PAUSE:
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{
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Lock::Guard guard(obj->state.lock);
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_pager.get_regs(&obj->state);
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obj->state.exceptions++;
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obj->state.in_exception = true;
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/*
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* It might occur that the thread raises an exception,
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* after it already got resumed by the cpu_session, in
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* that case we unblock it immediately.
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*/
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if (!obj->state.paused) {
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_pager.set_reply_dst(Native_thread(obj->badge()));
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reply_pending = true;
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}
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break;
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}
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default:
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error("got unknown message type ", Hex(_pager.msg_type()));
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}
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});
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};
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}
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void Pager_entrypoint::dissolve(Pager_object *obj)
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{
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/* cleanup at cap session */
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_cap_factory.free(obj->Object_pool<Pager_object>::Entry::cap());
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remove(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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using namespace Fiasco;
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Native_capability cap(_cap_factory.alloc(Thread::_thread_cap));
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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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