114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
/**
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* \brief Implementations for the start of a thread
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2012-02-12
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*/
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/*
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* Copyright (C) 2012-2013 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.h>
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#include <base/printf.h>
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#include <base/sleep.h>
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#include <base/env.h>
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using namespace Genode;
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namespace Genode { Rm_session * env_context_area_rm_session(); }
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extern Ram_dataspace_capability _main_thread_utcb_ds;
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extern Native_thread_id _main_thread_id;
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/*****************
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** Thread_base **
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*****************/
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void Thread_base::_init_platform_thread(size_t weight, Type type)
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{
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if (!_cpu_session) { _cpu_session = env()->cpu_session(); }
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if (type == NORMAL) {
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/* create server object */
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char buf[48];
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name(buf, sizeof(buf));
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addr_t const utcb = (addr_t)&_context->utcb;
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_thread_cap = _cpu_session->create_thread(weight, buf, utcb);
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return;
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}
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/* if we got reinitialized we have to get rid of the old UTCB */
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size_t const utcb_size = sizeof(Native_utcb);
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addr_t const context_area = Native_config::context_area_virtual_base();
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addr_t const utcb_new = (addr_t)&_context->utcb - context_area;
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Rm_session * const rm = env_context_area_rm_session();
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if (type == REINITIALIZED_MAIN) { rm->detach(utcb_new); }
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/* remap initial main-thread UTCB according to context-area spec */
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try { rm->attach_at(_main_thread_utcb_ds, utcb_new, utcb_size); }
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catch(...) {
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PERR("failed to re-map UTCB");
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while (1) ;
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}
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/* adjust initial object state in case of a main thread */
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tid().thread_id = _main_thread_id;
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_thread_cap = env()->parent()->main_thread_cap();
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}
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void Thread_base::_deinit_platform_thread()
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{
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if (!_cpu_session)
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_cpu_session = env()->cpu_session();
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_cpu_session->kill_thread(_thread_cap);
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/* detach userland thread-context */
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size_t const size = sizeof(_context->utcb);
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addr_t utcb = Context_allocator::addr_to_base(_context) +
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Native_config::context_virtual_size() - size -
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Native_config::context_area_virtual_base();
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env_context_area_rm_session()->detach(utcb);
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if (_pager_cap.valid()) {
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env()->rm_session()->remove_client(_pager_cap);
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}
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}
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void Thread_base::start()
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{
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/* assign thread to protection domain */
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env()->pd_session()->bind_thread(_thread_cap);
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/* create pager object and assign it to the thread */
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_pager_cap = env()->rm_session()->add_client(_thread_cap);
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_cpu_session->set_pager(_thread_cap, _pager_cap);
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/* attach userland thread-context */
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try {
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Ram_dataspace_capability ds = _cpu_session->utcb(_thread_cap);
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size_t const size = sizeof(_context->utcb);
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addr_t dst = Context_allocator::addr_to_base(_context) +
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Native_config::context_virtual_size() - size -
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Native_config::context_area_virtual_base();
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env_context_area_rm_session()->attach_at(ds, dst, size);
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} catch (...) {
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PERR("failed to attach userland thread-context");
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sleep_forever();
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}
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/* start thread with its initial IP and aligned SP */
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_cpu_session->start(_thread_cap, (addr_t)_thread_start, _context->stack_top());
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}
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void Thread_base::cancel_blocking()
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{
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_cpu_session->cancel_blocking(_thread_cap);
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}
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