803 lines
20 KiB
C++
803 lines
20 KiB
C++
/*
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* \brief Kernel backend 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 <unmanaged_singleton.h>
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#include <cpu_session/cpu_session.h>
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/* core includes */
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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 <platform_pd.h>
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#include <pic.h>
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using namespace Kernel;
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typedef Genode::Thread_state Thread_state;
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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 && size <= _utcb_phys->size());
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Genode::memcpy(_utcb_phys->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::init(Cpu * const cpu, Pd * const pd,
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Native_utcb * const utcb_phys, bool const start)
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{
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assert(_state == AWAITS_START)
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Cpu_job::affinity(cpu);
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_utcb_phys = utcb_phys;
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/* join protection domain */
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_pd = pd;
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_pd->admit(this);
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/* print log message */
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if (START_VERBOSE) {
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Genode::printf("start thread %u '%s' in program '%s' ",
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id(), label(), 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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/* start execution */
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if (start) { _become_active(); }
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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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char const * Kernel::Thread::pd_label() const {
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return (_pd) ? _pd->platform_pd()->label() : "?"; }
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void Thread::_call_new_pd()
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{
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using namespace Genode;
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try {
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/* create protection domain */
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void * p = (void *) user_arg_1();
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Platform_pd * ppd = (Platform_pd *) user_arg_2();
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Translation_table * tt = ppd->translation_table_phys();
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new (p) Pd(tt, ppd);
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user_arg_0(0);
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return;
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} catch(...) { }
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user_arg_0(-1);
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}
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void Thread::_call_delete_pd() { reinterpret_cast<Pd*>(user_arg_1())->~Pd(); }
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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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/* create new thread */
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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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Thread * const t = new (p) Thread(priority, quota, label);
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user_arg_0(t->id());
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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_delete_thread() {
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reinterpret_cast<Thread*>(user_arg_1())->~Thread(); }
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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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Thread * const thread = (Thread*) user_arg_1();
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Pd * const pd = (Pd *) user_arg_3();
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/* start thread */
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thread->init(cpu, pd, (Native_utcb *)user_arg_4(), 1);
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user_arg_0(0);
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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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/* lookup thread */
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Thread * const thread = Thread::pool()->object(user_arg_1());
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if (!thread || pd() != thread->pd()) {
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PWRN("failed to lookup thread");
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user_arg_0(0);
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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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void Thread_event::_signal_acknowledged()
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{
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Cpu::tlb_insertions();
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_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()
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{
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if (_signal_context && !_signal_context->submit(1)) { return; }
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PWRN("failed to communicate thread event");
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}
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void Thread::_call_yield_thread()
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{
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Thread * const t = Thread::pool()->object(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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void * buf_base;
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size_t buf_size;
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_utcb_phys->message()->buffer_info(buf_base, buf_size);
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if (Ipc_node::await_request(buf_base, buf_size)) {
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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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Thread * const dst = Thread::pool()->object(user_arg_1());
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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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void * buf_base;
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size_t buf_size, msg_size;
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_utcb_phys->message()->request_info(buf_base, buf_size, msg_size);
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_state = AWAITS_IPC;
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Ipc_node::send_request(dst, buf_base, buf_size, msg_size, help);
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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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void * msg_base;
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size_t msg_size;
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_utcb_phys->message()->reply_info(msg_base, msg_size);
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Ipc_node::send_reply(msg_base, msg_size);
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bool const await_request_msg = user_arg_1();
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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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unsigned const signal_context_id = user_arg_3();
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if (t->_route_event(event_id, signal_context_id)) { user_arg_0(-1); }
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else { user_arg_0(0); }
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return;
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}
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int Thread::_route_event(unsigned const event_id,
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unsigned const signal_context_id)
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{
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/* lookup signal context */
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Signal_context * c;
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if (signal_context_id) {
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c = Signal_context::pool()->object(signal_context_id);
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if (!c) {
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PWRN("%s -> %s: unknown signal context %u",
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pd_label(), label(), signal_context_id);
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return -1;
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}
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} else { c = 0; }
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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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unsigned Thread_event::signal_context_id() const
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{
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if (_signal_context) { return _signal_context->id(); }
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return 0;
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}
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void Thread::_call_access_thread_regs()
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{
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/* get targeted thread */
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unsigned const reads = user_arg_2();
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unsigned const writes = user_arg_3();
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Thread * const t = (Thread*) user_arg_1();
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if (!t) {
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PWRN("unknown thread");
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user_arg_0(reads + writes);
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return;
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}
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/* execute read operations */
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addr_t * const utcb = (addr_t *)_utcb_phys->base();
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addr_t * const read_ids = &utcb[0];
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addr_t * values = (addr_t *)user_arg_4();
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for (unsigned i = 0; i < reads; i++) {
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if (t->_read_reg(read_ids[i], *values)) {
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user_arg_0(reads + writes - i);
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return;
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}
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values++;
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}
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/* execute write operations */
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addr_t * const write_ids = &utcb[reads];
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for (unsigned i = 0; i < writes; i++) {
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if (t->_write_reg(write_ids[i], *values)) {
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user_arg_0(writes - i);
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return;
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}
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values++;
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}
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user_arg_0(0);
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return;
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}
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void Thread::_call_update_data_region()
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{
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/*
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* FIXME: If the caller is not a core thread, the kernel operates in a
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* different address space than the caller. Combined with the fact
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* that at least ARMv7 doesn't provide cache operations by physical
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* address, this prevents us from selectively maintaining caches.
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* The future solution will be a kernel that is mapped to every
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* address space so we can use virtual addresses of the caller. Up
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* until then we apply operations to caches as a whole instead.
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*/
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if (!_core()) {
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Cpu::flush_data_caches();
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return;
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}
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auto base = (addr_t)user_arg_1();
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auto const size = (size_t)user_arg_2();
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Cpu::flush_data_caches_by_virt_region(base, size);
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Cpu::invalidate_instr_caches();
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}
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void Thread::_call_update_instr_region()
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{
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/*
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* FIXME: If the caller is not a core thread, the kernel operates in a
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* different address space than the caller. Combined with the fact
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* that at least ARMv7 doesn't provide cache operations by physical
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* address, this prevents us from selectively maintaining caches.
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* The future solution will be a kernel that is mapped to every
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* address space so we can use virtual addresses of the caller. Up
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* until then we apply operations to caches as a whole instead.
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*/
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if (!_core()) {
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Cpu::flush_data_caches();
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Cpu::invalidate_instr_caches();
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return;
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}
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auto base = (addr_t)user_arg_1();
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auto const size = (size_t)user_arg_2();
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Cpu::flush_data_caches_by_virt_region(base, size);
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Cpu::invalidate_instr_caches_by_virt_region(base, size);
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}
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void Thread::_print_activity_table()
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{
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for (unsigned id = 0; id < MAX_KERNEL_OBJECTS; id++) {
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Thread * const t = Thread::pool()->object(id);
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if (!t) { continue; }
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t->_print_activity(t == this);
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}
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return;
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}
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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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unsigned const receiver_id = Signal_handler::receiver()->id();
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Genode::printf("\033[32m await SIG %u\033[0m", receiver_id);
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break; }
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case AWAITS_SIGNAL_CONTEXT_KILL: {
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unsigned const context_id = Signal_context_killer::context()->id();
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Genode::printf("\033[32m await SCK %u\033[0m", context_id);
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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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{
|
|
Genode::printf(" ip %lx sp %lx\n", ip, sp);
|
|
}
|
|
|
|
|
|
void Thread::_print_activity_when_awaits_ipc()
|
|
{
|
|
switch (Ipc_node::state()) {
|
|
case AWAIT_REPLY: {
|
|
Thread * const server = dynamic_cast<Thread *>(Ipc_node::outbuf_dst());
|
|
Genode::printf("\033[32m await RPL %u\033[0m", server->id());
|
|
break; }
|
|
case AWAIT_REQUEST: {
|
|
Genode::printf("\033[32m await REQ\033[0m");
|
|
break; }
|
|
case PREPARE_AND_AWAIT_REPLY: {
|
|
Thread * const server = dynamic_cast<Thread *>(Ipc_node::outbuf_dst());
|
|
Genode::printf("\033[32m prep RPL await RPL %u\033[0m", server->id());
|
|
break; }
|
|
default: break;
|
|
}
|
|
}
|
|
|
|
|
|
void Thread::_call_print_char()
|
|
{
|
|
char const c = user_arg_1();
|
|
if (!c) { _print_activity_table(); }
|
|
Genode::printf("%c", (char)user_arg_1());
|
|
}
|
|
|
|
|
|
void Thread::_call_new_signal_receiver()
|
|
{
|
|
/* create receiver */
|
|
void * const p = (void *)user_arg_1();
|
|
Signal_receiver * const r = new (p) Signal_receiver();
|
|
user_arg_0(r->id());
|
|
}
|
|
|
|
|
|
void Thread::_call_new_signal_context()
|
|
{
|
|
/* create and assign context*/
|
|
void * const p = (void *)user_arg_1();
|
|
Signal_receiver * const r = (Signal_receiver *) user_arg_2();
|
|
unsigned const imprint = user_arg_3();
|
|
Signal_context * const c = new (p) Signal_context(r, imprint);
|
|
user_arg_0(c->id());
|
|
}
|
|
|
|
|
|
void Thread::_call_await_signal()
|
|
{
|
|
/* lookup receiver */
|
|
unsigned const receiver_id = user_arg_1();
|
|
Signal_receiver * const r = Signal_receiver::pool()->object(receiver_id);
|
|
if (!r) {
|
|
PWRN("%s -> %s: cannot await, unknown signal receiver %u",
|
|
pd_label(), label(), receiver_id);
|
|
user_arg_0(-1);
|
|
return;
|
|
}
|
|
/* register handler at the receiver */
|
|
if (r->add_handler(this)) {
|
|
PWRN("failed to register handler at signal receiver");
|
|
user_arg_0(-1);
|
|
return;
|
|
}
|
|
user_arg_0(0);
|
|
}
|
|
|
|
|
|
void Thread::_call_signal_pending()
|
|
{
|
|
/* lookup signal receiver */
|
|
unsigned const id = user_arg_1();
|
|
Signal_receiver * const r = Signal_receiver::pool()->object(id);
|
|
if (!r) {
|
|
PWRN("%s -> %s: no pending, unknown signal receiver %u",
|
|
pd_label(), label(), id);
|
|
user_arg_0(0);
|
|
return;
|
|
}
|
|
/* get pending state */
|
|
user_arg_0(r->deliverable());
|
|
}
|
|
|
|
|
|
void Thread::_call_submit_signal()
|
|
{
|
|
/* lookup signal context */
|
|
unsigned const id = user_arg_1();
|
|
Signal_context * const c = Signal_context::pool()->object(id);
|
|
if(!c) {
|
|
PWRN("%s -> %s: cannot submit unknown signal context %u",
|
|
pd_label(), label(), id);
|
|
user_arg_0(-1);
|
|
return;
|
|
}
|
|
/* trigger signal context */
|
|
if (c->submit(user_arg_2())) {
|
|
PWRN("failed to submit signal context");
|
|
user_arg_0(-1);
|
|
return;
|
|
}
|
|
user_arg_0(0);
|
|
}
|
|
|
|
|
|
void Thread::_call_ack_signal()
|
|
{
|
|
/* lookup signal context */
|
|
unsigned const id = user_arg_1();
|
|
Signal_context * const c = Signal_context::pool()->object(id);
|
|
if (!c) {
|
|
PWRN("%s -> %s: cannot ack unknown signal context %u",
|
|
pd_label(), label(), id);
|
|
return;
|
|
}
|
|
/* acknowledge */
|
|
c->ack();
|
|
}
|
|
|
|
|
|
void Thread::_call_kill_signal_context()
|
|
{
|
|
/* lookup signal context */
|
|
unsigned const id = user_arg_1();
|
|
Signal_context * const c = Signal_context::pool()->object(id);
|
|
if (!c) {
|
|
PWRN("%s -> %s: cannot kill unknown signal context %u",
|
|
pd_label(), label(), id);
|
|
user_arg_0(-1);
|
|
return;
|
|
}
|
|
/* kill signal context */
|
|
if (c->kill(this)) {
|
|
PWRN("failed to kill signal context");
|
|
user_arg_0(-1);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
void Thread::_call_delete_signal_context() {
|
|
reinterpret_cast<Signal_context*>(user_arg_1())->~Signal_context(); }
|
|
|
|
|
|
void Thread::_call_delete_signal_receiver() {
|
|
reinterpret_cast<Signal_receiver*>(user_arg_1())->~Signal_receiver(); }
|
|
|
|
|
|
void Thread::_call_new_irq()
|
|
{
|
|
Signal_context * const c = Signal_context::pool()->object(user_arg_3());
|
|
if (!c) {
|
|
PWRN("%s -> %s: invalid signal context for interrupt",
|
|
pd_label(), label());
|
|
user_arg_0(-1);
|
|
return;
|
|
}
|
|
|
|
new ((void *)user_arg_1()) User_irq(user_arg_2(), *c);
|
|
user_arg_0(0);
|
|
}
|
|
|
|
|
|
void Thread::_call_delete_irq() {
|
|
reinterpret_cast<User_irq*>(user_arg_1())->~User_irq(); }
|
|
|
|
|
|
int Thread::_read_reg(addr_t const id, addr_t & value) const
|
|
{
|
|
addr_t Thread::* const reg = _reg(id);
|
|
if (reg) {
|
|
value = this->*reg;
|
|
return 0;
|
|
}
|
|
PWRN("%s -> %s: cannot read unknown thread register %p",
|
|
pd_label(), label(), (void*)id);
|
|
return -1;
|
|
}
|
|
|
|
|
|
int Thread::_write_reg(addr_t const id, addr_t const value)
|
|
{
|
|
addr_t Thread::* const reg = _reg(id);
|
|
if (reg) {
|
|
this->*reg = value;
|
|
return 0;
|
|
}
|
|
PWRN("%s -> %s: cannot write unknown thread register %p",
|
|
pd_label(), label(), (void*)id);
|
|
return -1;
|
|
}
|
|
|
|
|
|
void Thread::_call()
|
|
{
|
|
/* switch over unrestricted kernel calls */
|
|
unsigned const call_id = user_arg_0();
|
|
switch (call_id) {
|
|
case call_id_update_data_region(): _call_update_data_region(); return;
|
|
case call_id_update_instr_region(): _call_update_instr_region(); return;
|
|
case call_id_pause_current_thread(): _call_pause_current_thread(); return;
|
|
case call_id_resume_local_thread(): _call_resume_local_thread(); return;
|
|
case call_id_yield_thread(): _call_yield_thread(); return;
|
|
case call_id_send_request_msg(): _call_send_request_msg(); return;
|
|
case call_id_send_reply_msg(): _call_send_reply_msg(); return;
|
|
case call_id_await_request_msg(): _call_await_request_msg(); return;
|
|
case call_id_kill_signal_context(): _call_kill_signal_context(); return;
|
|
case call_id_submit_signal(): _call_submit_signal(); return;
|
|
case call_id_await_signal(): _call_await_signal(); return;
|
|
case call_id_signal_pending(): _call_signal_pending(); return;
|
|
case call_id_ack_signal(): _call_ack_signal(); return;
|
|
case call_id_print_char(): _call_print_char(); return;
|
|
default:
|
|
/* check wether this is a core thread */
|
|
if (!_core()) {
|
|
PWRN("%s -> %s: not entitled to do kernel call",
|
|
pd_label(), label());
|
|
_stop();
|
|
return;
|
|
}
|
|
}
|
|
/* switch over kernel calls that are restricted to core */
|
|
switch (call_id) {
|
|
case call_id_new_thread(): _call_new_thread(); return;
|
|
case call_id_thread_quota(): _call_thread_quota(); return;
|
|
case call_id_delete_thread(): _call_delete_thread(); return;
|
|
case call_id_start_thread(): _call_start_thread(); return;
|
|
case call_id_resume_thread(): _call_resume_thread(); return;
|
|
case call_id_access_thread_regs(): _call_access_thread_regs(); return;
|
|
case call_id_route_thread_event(): _call_route_thread_event(); return;
|
|
case call_id_update_pd(): _call_update_pd(); return;
|
|
case call_id_new_pd(): _call_new_pd(); return;
|
|
case call_id_delete_pd(): _call_delete_pd(); return;
|
|
case call_id_new_signal_receiver(): _call_new_signal_receiver(); return;
|
|
case call_id_new_signal_context(): _call_new_signal_context(); return;
|
|
case call_id_delete_signal_context(): _call_delete_signal_context(); return;
|
|
case call_id_delete_signal_receiver(): _call_delete_signal_receiver(); return;
|
|
case call_id_new_vm(): _call_new_vm(); return;
|
|
case call_id_delete_vm(): _call_delete_vm(); return;
|
|
case call_id_run_vm(): _call_run_vm(); return;
|
|
case call_id_pause_vm(): _call_pause_vm(); return;
|
|
case call_id_pause_thread(): _call_pause_thread(); return;
|
|
case call_id_new_irq(): _call_new_irq(); return;
|
|
case call_id_delete_irq(): _call_delete_irq(); return;
|
|
default:
|
|
PWRN("%s -> %s: unknown kernel call", pd_label(), label());
|
|
_stop();
|
|
return;
|
|
}
|
|
}
|