241 lines
6.2 KiB
C++
241 lines
6.2 KiB
C++
/*
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* \brief NOVA-specific support code for the server-side RPC API
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* \author Norman Feske
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* \author Sebastian Sumpf
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* \author Alexander Boettcher
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* \date 2010-01-13
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*/
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/*
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* Copyright (C) 2010-2015 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/printf.h>
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#include <base/rpc_server.h>
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#include <base/env.h>
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/* base-internal includes */
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#include <base/internal/stack.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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#include <nova/util.h>
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using namespace Genode;
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/***********************
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** Server entrypoint **
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***********************/
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Untyped_capability Rpc_entrypoint::_manage(Rpc_object_base *obj)
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{
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using namespace Nova;
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Untyped_capability ec_cap;
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/* _ec_sel is invalid until thread gets started */
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if (tid().ec_sel != Native_thread::INVALID_INDEX)
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ec_cap = Native_capability(tid().ec_sel);
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else
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ec_cap = _thread_cap;
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Untyped_capability obj_cap = _alloc_rpc_cap(_pd_session, ec_cap,
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(addr_t)&_activation_entry);
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if (!obj_cap.valid())
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return obj_cap;
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/* add server object to object pool */
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obj->cap(obj_cap);
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insert(obj);
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/* return object capability managed by entrypoint thread */
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return obj_cap;
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}
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void Rpc_entrypoint::_dissolve(Rpc_object_base *obj)
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{
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/* de-announce object from cap_session */
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_free_rpc_cap(_pd_session, obj->cap());
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/* avoid any incoming IPC */
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Nova::revoke(Nova::Obj_crd(obj->cap().local_name(), 0), true);
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/* make sure nobody is able to find this object */
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remove(obj);
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/*
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* The activation may execute a blocking operation in a dispatch function.
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* Before resolving the corresponding object, we need to ensure that it is
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* no longer used by an activation. Therefore, we to need cancel an
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* eventually blocking operation and let the activation leave the context
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* of the object.
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*/
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using namespace Nova;
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Utcb *utcb = reinterpret_cast<Utcb *>(Thread_base::myself()->utcb());
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/* don't call ourself */
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if (utcb == reinterpret_cast<Utcb *>(this->utcb()))
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return;
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/*
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* Required outside of core. E.g. launchpad needs it to forcefully kill
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* a client which blocks on a session opening request where the service
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* is not up yet.
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*/
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cancel_blocking();
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/* activate entrypoint now - otherwise cleanup call will block forever */
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_delay_start.unlock();
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/* make a IPC to ensure that cap() identifier is not used anymore */
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utcb->msg[0] = 0xdead;
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utcb->set_msg_word(1);
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if (uint8_t res = call(_cap.local_name()))
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PERR("%8p - could not clean up entry point of thread 0x%p - res %u",
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utcb, this->utcb(), res);
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}
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void Rpc_entrypoint::_activation_entry()
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{
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/* retrieve portal id from eax/rdi */
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#ifdef __x86_64__
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addr_t id_pt; asm volatile ("" : "=D" (id_pt));
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#else
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addr_t id_pt; asm volatile ("" : "=a" (id_pt));
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#endif
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Rpc_entrypoint *ep = static_cast<Rpc_entrypoint *>(Thread_base::myself());
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/* required to decrease ref count of capability used during last reply */
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ep->_snd_buf.snd_reset();
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/* prepare ipc server object (copying utcb content to message buffer */
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int opcode = 0;
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Ipc_server srv(&ep->_snd_buf, &ep->_rcv_buf);
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srv >> IPC_WAIT >> opcode;
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/* set default return value */
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srv.ret(Ipc_client::ERR_INVALID_OBJECT);
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/* in case of a portal cleanup call we are done here - just reply */
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if (ep->_cap.local_name() == id_pt) {
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if (!ep->_rcv_buf.prepare_rcv_window((Nova::Utcb *)ep->utcb()))
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PWRN("out of capability selectors for handling server requests");
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srv << IPC_REPLY;
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}
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{
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/* potentially delay start */
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Lock::Guard lock_guard(ep->_delay_start);
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}
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/* atomically lookup and lock referenced object */
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auto lambda = [&] (Rpc_object_base *obj) {
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if (!obj) {
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PERR("could not look up server object, return from call id_pt=%lx",
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id_pt);
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return;
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}
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/* dispatch request */
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try { srv.ret(obj->dispatch(opcode, srv, srv)); }
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catch (Blocking_canceled) { }
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};
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ep->apply(id_pt, lambda);
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if (!ep->_rcv_buf.prepare_rcv_window((Nova::Utcb *)ep->utcb()))
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PWRN("out of capability selectors for handling server requests");
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srv << IPC_REPLY;
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}
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void Rpc_entrypoint::entry()
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{
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/*
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* Thread entry is not used for activations on NOVA
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*/
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}
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void Rpc_entrypoint::_block_until_cap_valid() { }
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void Rpc_entrypoint::activate()
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{
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/*
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* In contrast to a normal thread, a server activation is created at
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* construction time. However, it executes no code because processing
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* time is always provided by the caller of the server activation. To
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* delay the processing of requests until the 'activate' function is
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* called, we grab the '_delay_start' lock on construction and release it
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* here.
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*/
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_delay_start.unlock();
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}
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Rpc_entrypoint::Rpc_entrypoint(Pd_session *pd_session, size_t stack_size,
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const char *name, bool start_on_construction,
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Affinity::Location location)
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:
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Thread_base(Cpu_session::DEFAULT_WEIGHT, name, stack_size),
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_delay_start(Lock::LOCKED),
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_pd_session(*pd_session)
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{
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/* when not running in core set the affinity via cpu session */
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if (_tid.ec_sel == Native_thread::INVALID_INDEX) {
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/* place new thread on the specified CPU */
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if (location.valid())
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_cpu_session->affinity(_thread_cap, location);
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/* magic value evaluated by thread_nova.cc to start a local thread */
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_tid.ec_sel = Native_thread::INVALID_INDEX - 1;
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} else {
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/* tell affinity CPU in 'core' via stack */
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reinterpret_cast<Affinity::Location *>(stack_base())[0] = location;
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}
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/* required to create a 'local' EC */
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Thread_base::start();
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/* create cleanup portal */
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_cap = _alloc_rpc_cap(_pd_session, Native_capability(_tid.ec_sel),
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(addr_t)_activation_entry);
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if (!_cap.valid())
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throw Cpu_session::Thread_creation_failed();
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/* prepare portal receive window of new thread */
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if (!_rcv_buf.prepare_rcv_window((Nova::Utcb *)&_stack->utcb()))
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throw Cpu_session::Thread_creation_failed();
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if (start_on_construction)
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activate();
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}
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Rpc_entrypoint::~Rpc_entrypoint()
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{
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typedef Object_pool<Rpc_object_base> Pool;
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Pool::remove_all([&] (Rpc_object_base *obj) {
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PWRN("Object pool not empty in %s", __func__);
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_dissolve(obj);
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});
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if (!_cap.valid())
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return;
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_free_rpc_cap(_pd_session, _cap);
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}
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