684 lines
17 KiB
C++
684 lines
17 KiB
C++
/*
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* \brief Kernel back-end for execution contexts in userland
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2013-09-15
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*/
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/*
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* Copyright (C) 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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/* Genode includes */
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#include <base/thread_state.h>
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#include <cpu_session/cpu_session.h>
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#include <util/construct_at.h>
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/* base-internal includes */
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#include <base/internal/unmanaged_singleton.h>
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#include <base/internal/native_utcb.h>
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/* core includes */
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#include <assert.h>
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#include <kernel/kernel.h>
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#include <kernel/thread.h>
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#include <kernel/irq.h>
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#include <map_local.h>
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#include <platform_pd.h>
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#include <pic.h>
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extern "C" void _core_start(void);
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using namespace Kernel;
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bool Thread::_core() const { return pd() == core_pd(); }
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void Thread::_signal_context_kill_pending()
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{
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assert(_state == ACTIVE);
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_become_inactive(AWAITS_SIGNAL_CONTEXT_KILL);
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}
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void Thread::_signal_context_kill_done()
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{
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assert(_state == AWAITS_SIGNAL_CONTEXT_KILL);
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user_arg_0(0);
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_become_active();
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}
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void Thread::_signal_context_kill_failed()
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{
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assert(_state == AWAITS_SIGNAL_CONTEXT_KILL);
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user_arg_0(-1);
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_become_active();
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}
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void Thread::_await_signal(Signal_receiver * const receiver)
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{
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_become_inactive(AWAITS_SIGNAL);
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_signal_receiver = receiver;
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}
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void Thread::_receive_signal(void * const base, size_t const size)
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{
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assert(_state == AWAITS_SIGNAL);
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Genode::memcpy((void*)utcb()->base(), base, size);
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_become_active();
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}
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void Thread::_send_request_succeeded()
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{
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assert(_state == AWAITS_IPC);
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user_arg_0(0);
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_state = ACTIVE;
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if (!Cpu_job::own_share_active()) { _activate_used_shares(); }
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}
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void Thread::_send_request_failed()
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{
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assert(_state == AWAITS_IPC);
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user_arg_0(-1);
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_state = ACTIVE;
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if (!Cpu_job::own_share_active()) { _activate_used_shares(); }
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}
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void Thread::_await_request_succeeded()
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{
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assert(_state == AWAITS_IPC);
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user_arg_0(0);
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_become_active();
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}
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void Thread::_await_request_failed()
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{
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assert(_state == AWAITS_IPC);
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user_arg_0(-1);
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_become_active();
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}
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bool Thread::_resume()
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{
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switch (_state) {
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case AWAITS_RESUME:
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_become_active();
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return true;
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case AWAITS_IPC:
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Ipc_node::cancel_waiting();
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return true;
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case AWAITS_SIGNAL:
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Signal_handler::cancel_waiting();
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user_arg_0(-1);
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_become_active();
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return true;
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case AWAITS_SIGNAL_CONTEXT_KILL:
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Signal_context_killer::cancel_waiting();
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return true;
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default:
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return false;
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}
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}
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void Thread::_pause()
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{
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assert(_state == AWAITS_RESUME || _state == ACTIVE);
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_become_inactive(AWAITS_RESUME);
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}
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void Thread::_deactivate_used_shares()
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{
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Cpu_job::_deactivate_own_share();
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Ipc_node::for_each_helper([&] (Ipc_node * const h) {
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static_cast<Thread *>(h)->_deactivate_used_shares(); });
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}
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void Thread::_activate_used_shares()
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{
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Cpu_job::_activate_own_share();
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Ipc_node::for_each_helper([&] (Ipc_node * const h) {
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static_cast<Thread *>(h)->_activate_used_shares(); });
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}
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void Thread::_become_active()
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{
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if (_state != ACTIVE) { _activate_used_shares(); }
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_state = ACTIVE;
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}
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void Thread::_become_inactive(State const s)
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{
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if (_state == ACTIVE) { _deactivate_used_shares(); }
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_state = s;
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}
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void Thread::_stop() { _become_inactive(STOPPED); }
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Cpu_job * Thread::helping_sink() {
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return static_cast<Thread *>(Ipc_node::helping_sink()); }
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void Thread::_receive_yielded_cpu()
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{
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if (_state == AWAITS_RESUME) { _become_active(); }
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else { PWRN("failed to receive yielded CPU"); }
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}
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void Thread::proceed(unsigned const cpu) { mtc()->switch_to_user(this, cpu); }
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size_t Thread::_core_to_kernel_quota(size_t const quota) const
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{
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using Genode::Cpu_session;
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using Genode::sizet_arithm_t;
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size_t const tics = cpu_pool()->timer()->ms_to_tics(Kernel::cpu_quota_ms);
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return Cpu_session::quota_lim_downscale<sizet_arithm_t>(quota, tics);
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}
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void Thread::_call_new_thread()
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{
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void * const p = (void *)user_arg_1();
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unsigned const priority = user_arg_2();
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unsigned const quota = _core_to_kernel_quota(user_arg_3());
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char const * const label = (char *)user_arg_4();
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Core_object<Thread> * co =
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Genode::construct_at<Core_object<Thread> >(p, priority, quota, label);
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user_arg_0(co->core_capid());
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}
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void Thread::_call_thread_quota()
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{
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Thread * const thread = (Thread *)user_arg_1();
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thread->Cpu_job::quota(_core_to_kernel_quota(user_arg_2()));
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}
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void Thread::_call_start_thread()
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{
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/* lookup CPU */
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Cpu * const cpu = cpu_pool()->cpu(user_arg_2());
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if (!cpu) {
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PWRN("failed to lookup CPU");
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user_arg_0(-2);
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return;
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}
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user_arg_0(0);
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Thread * const thread = (Thread*) user_arg_1();
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assert(thread->_state == AWAITS_START)
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thread->affinity(cpu);
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/* join protection domain */
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thread->_pd = (Pd *) user_arg_3();
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thread->_pd->admit(thread);
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/* print log message */
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if (START_VERBOSE) {
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Genode::printf("start thread '%s' in program '%s' ",
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thread->label(), thread->pd_label());
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if (NR_OF_CPUS) {
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Genode::printf("on CPU %u/%u ", cpu->id(), NR_OF_CPUS); }
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Genode::printf("\n");
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}
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thread->Ipc_node::_init((Native_utcb *)user_arg_4(), this);
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thread->_become_active();
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}
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void Thread::_call_pause_current_thread() { _pause(); }
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void Thread::_call_pause_thread() {
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reinterpret_cast<Thread*>(user_arg_1())->_pause(); }
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void Thread::_call_resume_thread() {
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user_arg_0(reinterpret_cast<Thread*>(user_arg_1())->_resume()); }
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void Thread::_call_resume_local_thread()
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{
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if (!pd()) return;
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/* lookup thread */
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Thread * const thread = pd()->cap_tree().find<Thread>(user_arg_1());
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if (!thread || pd() != thread->pd()) {
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PWRN("%s -> %s: failed to lookup thread %u to resume it",
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pd_label(), label(), (capid_t)user_arg_1());
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_stop();
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return;
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}
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/* resume thread */
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user_arg_0(thread->_resume());
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}
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Thread_event::Thread_event(Thread * const t)
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: _thread(t), _signal_context(0) { }
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void Thread_event::submit() { if (_signal_context) _signal_context->submit(1); }
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void Thread::_call_yield_thread()
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{
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Thread * const t = pd()->cap_tree().find<Thread>(user_arg_1());
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if (t) { t->_receive_yielded_cpu(); }
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Cpu_job::_yield();
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}
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void Thread::_call_await_request_msg()
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{
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if (Ipc_node::await_request(user_arg_1())) {
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user_arg_0(0);
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return;
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}
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_become_inactive(AWAITS_IPC);
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}
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void Thread::_call_send_request_msg()
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{
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Object_identity_reference * oir = pd()->cap_tree().find(user_arg_1());
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Thread * const dst = (oir) ? oir->object<Thread>() : nullptr;
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if (!dst) {
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PWRN("%s -> %s: cannot send to unknown recipient %llu",
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pd_label(), label(), (unsigned long long)user_arg_1());
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_become_inactive(AWAITS_IPC);
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return;
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}
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bool const help = Cpu_job::_helping_possible(dst);
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oir = oir->find(dst->pd());
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Ipc_node::send_request(dst, oir ? oir->capid() : cap_id_invalid(),
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help, user_arg_2());
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_state = AWAITS_IPC;
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if (!help || !dst->own_share_active()) { _deactivate_used_shares(); }
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}
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void Thread::_call_send_reply_msg()
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{
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Ipc_node::send_reply();
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bool const await_request_msg = user_arg_2();
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if (await_request_msg) { _call_await_request_msg(); }
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else { user_arg_0(0); }
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}
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void Thread::_call_route_thread_event()
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{
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/* override event route */
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Thread * const t = (Thread*) user_arg_1();
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unsigned const event_id = user_arg_2();
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Signal_context * c = pd()->cap_tree().find<Signal_context>(user_arg_3());
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user_arg_0(t->_route_event(event_id, c));
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}
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int Thread::_route_event(unsigned const event_id,
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Signal_context * c)
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{
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/* lookup event and assign signal context */
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Thread_event Thread::* e = _event(event_id);
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if (!e) { return -1; }
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(this->*e).signal_context(c);
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return 0;
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}
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void Thread_event::signal_context(Signal_context * const c)
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{
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_signal_context = c;
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if (_signal_context) { _signal_context->ack_handler(this); }
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}
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Signal_context * const Thread_event::signal_context() const {
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return _signal_context; }
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void Thread::_print_activity(bool const printing_thread)
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{
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Genode::printf("\033[33m%s -> %s:\033[0m", pd_label(), label());
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switch (_state) {
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case AWAITS_START: {
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Genode::printf("\033[32m init\033[0m");
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break; }
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case ACTIVE: {
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if (!printing_thread) { Genode::printf("\033[32m run\033[0m"); }
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else { Genode::printf("\033[32m debug\033[0m"); }
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break; }
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case AWAITS_IPC: {
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_print_activity_when_awaits_ipc();
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break; }
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case AWAITS_RESUME: {
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Genode::printf("\033[32m await RES\033[0m");
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break; }
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case AWAITS_SIGNAL: {
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Genode::printf("\033[32m await SIG\033[0m");
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break; }
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case AWAITS_SIGNAL_CONTEXT_KILL: {
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Genode::printf("\033[32m await SCK\033[0m");
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break; }
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case STOPPED: {
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Genode::printf("\033[32m stop\033[0m");
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break; }
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}
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_print_common_activity();
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}
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void Thread::_print_common_activity()
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{
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Genode::printf(" ip %lx sp %lx\n", ip, sp);
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}
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void Thread::_print_activity_when_awaits_ipc()
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{
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switch (Ipc_node::state()) {
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case AWAIT_REPLY: {
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Thread * const server = dynamic_cast<Thread *>(Ipc_node::callee());
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Genode::printf("\033[32m await RPL %s -> %s\033[0m",
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server->pd_label(), server->label());
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break; }
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case AWAIT_REQUEST: {
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Genode::printf("\033[32m await REQ\033[0m");
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break; }
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default: break;
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}
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}
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void Thread::_call_print_char() { Genode::printf("%c", (char)user_arg_1()); }
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void Thread::_call_await_signal()
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{
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/* lookup receiver */
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Signal_receiver * const r = pd()->cap_tree().find<Signal_receiver>(user_arg_1());
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if (!r) {
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PWRN("%s -> %s: cannot await, unknown signal receiver %u",
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pd_label(), label(), (capid_t)user_arg_1());
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user_arg_0(-1);
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return;
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}
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/* register handler at the receiver */
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if (r->add_handler(this)) {
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PWRN("failed to register handler at signal receiver");
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user_arg_0(-1);
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return;
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}
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user_arg_0(0);
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}
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void Thread::_call_submit_signal()
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{
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/* lookup signal context */
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Signal_context * const c = pd()->cap_tree().find<Signal_context>(user_arg_1());
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if(!c) {
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PWRN("%s -> %s: cannot submit unknown signal context",
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pd_label(), label());
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user_arg_0(-1);
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return;
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}
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/* trigger signal context */
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if (c->submit(user_arg_2())) {
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PWRN("failed to submit signal context");
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user_arg_0(-1);
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return;
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}
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user_arg_0(0);
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}
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void Thread::_call_ack_signal()
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{
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/* lookup signal context */
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Signal_context * const c = pd()->cap_tree().find<Signal_context>(user_arg_1());
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if (!c) {
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PWRN("%s -> %s: cannot ack unknown signal context",
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pd_label(), label());
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return;
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}
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/* acknowledge */
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c->ack();
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}
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void Thread::_call_kill_signal_context()
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{
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/* lookup signal context */
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Signal_context * const c = pd()->cap_tree().find<Signal_context>(user_arg_1());
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if (!c) {
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PWRN("%s -> %s: cannot kill unknown signal context",
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pd_label(), label());
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user_arg_0(-1);
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return;
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}
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/* kill signal context */
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if (c->kill(this)) {
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PWRN("failed to kill signal context");
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user_arg_0(-1);
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return;
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}
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}
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void Thread::_call_new_irq()
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{
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Signal_context * const c = pd()->cap_tree().find<Signal_context>(user_arg_3());
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if (!c) {
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PWRN("%s -> %s: invalid signal context for interrupt",
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pd_label(), label());
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user_arg_0(-1);
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return;
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}
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new ((void *)user_arg_1()) User_irq(user_arg_2(), *c);
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user_arg_0(0);
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}
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void Thread::_call_ack_irq() {
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reinterpret_cast<User_irq*>(user_arg_1())->enable(); }
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void Thread::_call_new_obj()
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{
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/* lookup thread */
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Object_identity_reference * ref = pd()->cap_tree().find(user_arg_2());
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Thread * thread = ref ? ref->object<Thread>() : nullptr;
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if (!thread ||
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(static_cast<Core_object<Thread>*>(thread)->capid() != ref->capid())) {
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if (thread)
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PWRN("faked thread %s -> %s", thread->pd_label(), thread->label());
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user_arg_0(cap_id_invalid());
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return;
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}
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using Thread_identity = Core_object_identity<Thread>;
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Thread_identity * coi =
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Genode::construct_at<Thread_identity>((void *)user_arg_1(), *thread);
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user_arg_0(coi->core_capid());
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}
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void Thread::_call_delete_obj()
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{
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using Object = Core_object_identity<Thread>;
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reinterpret_cast<Object*>(user_arg_1())->~Object();
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}
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void Thread::_call_ack_cap()
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{
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Object_identity_reference * oir = pd()->cap_tree().find(user_arg_1());
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if (oir) oir->remove_from_utcb();
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}
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void Thread::_call_delete_cap()
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{
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Object_identity_reference * oir = pd()->cap_tree().find(user_arg_1());
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if (!oir) return;
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if (oir->in_utcb()) return;
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destroy(pd()->platform_pd()->capability_slab(), oir);
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}
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void Thread::_call()
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{
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try {
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/* switch over unrestricted kernel calls */
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unsigned const call_id = user_arg_0();
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switch (call_id) {
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case call_id_update_data_region(): _call_update_data_region(); return;
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case call_id_update_instr_region(): _call_update_instr_region(); return;
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case call_id_pause_current_thread(): _call_pause_current_thread(); return;
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case call_id_resume_local_thread(): _call_resume_local_thread(); return;
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case call_id_yield_thread(): _call_yield_thread(); return;
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case call_id_send_request_msg(): _call_send_request_msg(); return;
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case call_id_send_reply_msg(): _call_send_reply_msg(); return;
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case call_id_await_request_msg(): _call_await_request_msg(); return;
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case call_id_kill_signal_context(): _call_kill_signal_context(); return;
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case call_id_submit_signal(): _call_submit_signal(); return;
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case call_id_await_signal(): _call_await_signal(); return;
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case call_id_ack_signal(): _call_ack_signal(); return;
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case call_id_print_char(): _call_print_char(); return;
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case call_id_ack_cap(): _call_ack_cap(); return;
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case call_id_delete_cap(): _call_delete_cap(); return;
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default:
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/* check wether this is a core thread */
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if (!_core()) {
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PWRN("%s -> %s: not entitled to do kernel call",
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pd_label(), label());
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_stop();
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return;
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}
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}
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/* switch over kernel calls that are restricted to core */
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switch (call_id) {
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case call_id_new_thread(): _call_new_thread(); return;
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case call_id_thread_quota(): _call_thread_quota(); return;
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case call_id_delete_thread(): _call_delete<Thread>(); return;
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case call_id_start_thread(): _call_start_thread(); return;
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case call_id_resume_thread(): _call_resume_thread(); return;
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case call_id_route_thread_event(): _call_route_thread_event(); return;
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case call_id_update_pd(): _call_update_pd(); return;
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case call_id_new_pd():
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_call_new<Pd>((Genode::Translation_table *) user_arg_2(),
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(Genode::Platform_pd *) user_arg_3());
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return;
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case call_id_delete_pd(): _call_delete<Pd>(); return;
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case call_id_new_signal_receiver(): _call_new<Signal_receiver>(); return;
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case call_id_new_signal_context():
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_call_new<Signal_context>((Signal_receiver*) user_arg_2(),
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(unsigned) user_arg_3());
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return;
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case call_id_delete_signal_context(): _call_delete<Signal_context>(); return;
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case call_id_delete_signal_receiver(): _call_delete<Signal_receiver>(); return;
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case call_id_new_vm(): _call_new_vm(); return;
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case call_id_delete_vm(): _call_delete_vm(); return;
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case call_id_run_vm(): _call_run_vm(); return;
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case call_id_pause_vm(): _call_pause_vm(); return;
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case call_id_pause_thread(): _call_pause_thread(); return;
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case call_id_new_irq(): _call_new_irq(); return;
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case call_id_delete_irq(): _call_delete<Irq>(); return;
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case call_id_ack_irq(): _call_ack_irq(); return;
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case call_id_new_obj(): _call_new_obj(); return;
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case call_id_delete_obj(): _call_delete_obj(); return;
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default:
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PWRN("%s -> %s: unknown kernel call", pd_label(), label());
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_stop();
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return;
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}
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} catch (Genode::Allocator::Out_of_memory &e) { user_arg_0(-2); }
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}
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|
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Thread::Thread(unsigned const priority, unsigned const quota,
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char const * const label)
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:
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Cpu_job(priority, quota), _fault(this), _fault_pd(0), _fault_addr(0),
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_fault_writes(0), _fault_signal(0), _state(AWAITS_START),
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_signal_receiver(0), _label(label)
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{
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_init();
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}
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|
|
|
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Thread_event Thread::* Thread::_event(unsigned const id) const
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|
{
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static Thread_event Thread::* _events[] = { &Thread::_fault };
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return id < sizeof(_events)/sizeof(_events[0]) ? _events[id] : 0;
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}
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|
|
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/*****************
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|
** Core_thread **
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|
*****************/
|
|
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Core_thread::Core_thread()
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: Core_object<Thread>(Cpu_priority::MAX, 0, "core")
|
|
{
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|
using Genode::Native_utcb;
|
|
|
|
static Genode::uint8_t stack[DEFAULT_STACK_SIZE];
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static Native_utcb * const utcb =
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unmanaged_singleton<Native_utcb, Genode::get_page_size()>();
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|
|
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/* map UTCB */
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|
Genode::map_local((addr_t)utcb, (addr_t)Genode::utcb_main_thread(),
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sizeof(Native_utcb) / Genode::get_page_size());
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|
|
|
utcb->cap_add(core_capid());
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|
utcb->cap_add(cap_id_invalid());
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|
utcb->cap_add(cap_id_invalid());
|
|
|
|
/* start thread with stack pointer at the top of stack */
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|
sp = (addr_t)&stack + DEFAULT_STACK_SIZE;
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|
ip = (addr_t)&_core_start;
|
|
|
|
affinity(cpu_pool()->primary_cpu());
|
|
_utcb = utcb;
|
|
Thread::_pd = core_pd();
|
|
Thread::_pd->admit(this);
|
|
_become_active();
|
|
}
|
|
|
|
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|
Thread & Core_thread::singleton()
|
|
{
|
|
static Core_thread ct;
|
|
return ct;
|
|
}
|