121 lines
2.7 KiB
C++
121 lines
2.7 KiB
C++
/*
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* \brief OKL4-specific pager framework
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* \author Norman Feske
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* \date 2009-03-31
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*/
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/*
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* Copyright (C) 2009-2012 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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#include <base/pager.h>
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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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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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/* lookup referenced object */
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Pager_object *obj = _ep ? _ep->obj_by_id(pager.badge()) : 0;
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/* handle request */
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if (obj) {
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if (pager.is_exception()) {
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obj->submit_exception_signal();
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continue;
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}
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/* send reply if page-fault handling succeeded */
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if (!obj->pager(pager))
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reply_pending = true;
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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() != CORE_TASK_ID) {
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#warning Check for messages from outside of core
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if (0) {
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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(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 = Native_capability(_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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