184 lines
4.2 KiB
C++
184 lines
4.2 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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* FIXME Isn't this file generic?
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*/
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/*
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* Copyright (C) 2006-2012 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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/* Genode includes */
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#include <base/pager.h>
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#include <base/env.h>
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#include <base/printf.h>
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#include <base/lock.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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/**********************
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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 = Native_capability(Thread_base::_thread_cap);
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_cap_valid.unlock();
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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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if (!_ep) {
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PWRN("Pager entrypoint not yet defined");
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continue;
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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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/* lookup referenced object */
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Pager_object *obj = _ep->obj_by_id(pager.badge());
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if (pager.is_exception()) {
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Lock::Guard guard(obj->state.lock);
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pager.copy_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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continue;
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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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PDBG("Could not resolve pf=%p ip=%p",
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(void*)pager.fault_addr(), (void*)pager.fault_ip());
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} else {
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pager.set_reply_dst(Native_capability(obj->badge(),0));
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reply_pending = true;
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continue;
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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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Pager_object *obj = _ep->obj_by_id(pager.badge());
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if (!obj) {
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PWRN("Got illegal wake-up message from %lx", pager.badge());
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continue;
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}
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/* send reply to the caller */
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pager.set_reply_dst(Native_capability());
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pager.acknowledge_wakeup();
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/* revert exception flag */
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{
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Lock::Guard guard(obj->state.lock);
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obj->state.in_exception = false;
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}
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/* send wake up message to requested thread */
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pager.set_reply_dst(Native_capability(obj->badge(),0));
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pager.acknowledge_wakeup();
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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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Pager_object *obj = _ep->obj_by_id(pager.badge());
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Lock::Guard guard(obj->state.lock);
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pager.copy_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_capability(obj->badge(),0));
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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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PERR("Got unknown message type %x!", pager.msg_type());
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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 *cap_session,
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Pager_activation_base *a)
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: _activation(a), _cap_session(cap_session)
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{
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_activation->ep(this);
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}
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void Pager_entrypoint::dissolve(Pager_object *obj) { remove(obj); }
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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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/* return invalid capability if no activation is present */
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if (!_activation) return Pager_capability();
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Native_capability c = _activation->cap();
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Native_capability cap(_cap_session->alloc(c));
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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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