306 lines
6.7 KiB
C++
306 lines
6.7 KiB
C++
/*
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* \brief Thread facility
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* \author Norman Feske
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* \author Sebastian Sumpf
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* \author Alexander Boettcher
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* \date 2009-10-02
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*/
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/*
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* Copyright (C) 2009-2013 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/printf.h>
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#include <base/cap_sel_alloc.h>
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#include <base/ipc_pager.h>
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/* core includes */
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#include <platform_thread.h>
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#include <platform_pd.h>
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#include <util.h>
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#include <nova_util.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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#include <nova/util.h>
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using namespace Genode;
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/*********************
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** Platform thread **
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*********************/
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void Platform_thread::affinity(Affinity::Location location)
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{
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if (_sel_exc_base != Native_thread::INVALID_INDEX) {
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PERR("Failure - affinity of thread could not be set");
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return;
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}
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_location = location;
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}
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Affinity::Location Platform_thread::affinity() { return _location; }
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int Platform_thread::start(void *ip, void *sp)
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{
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using namespace Nova;
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if (!_pager) {
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PERR("pager undefined");
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return -1;
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}
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if (!_pd) {
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PERR("protection domain undefined");
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return -2;
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}
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if (!is_main_thread()) {
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addr_t initial_sp = reinterpret_cast<addr_t>(sp);
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addr_t utcb = is_vcpu() ? 0 : round_page(initial_sp);
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if (_sel_exc_base == Native_thread::INVALID_INDEX) {
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PERR("exception base not specified");
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return -3;
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}
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/* ip == 0 means that caller will use the thread as worker */
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bool thread_global = ip;
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uint8_t res = create_ec(_sel_ec(), _pd->pd_sel(), _location.xpos(),
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utcb, initial_sp, _sel_exc_base, thread_global);
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if (res != Nova::NOVA_OK) {
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PERR("creation of new thread failed %u", res);
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return -4;
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}
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if (!thread_global) {
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_features |= WORKER;
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/* local/worker threads do not require a startup portal */
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revoke(Obj_crd(_pager->exc_pt_sel_client() + PT_SEL_STARTUP, 0));
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}
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_pager->initial_eip((addr_t)ip);
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_pager->initial_esp(initial_sp);
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_pager->client_set_ec(_sel_ec());
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return 0;
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}
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if (_sel_exc_base != Native_thread::INVALID_INDEX) {
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PERR("thread already started");
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return -5;
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}
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/*
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* For the first thread of a new PD, use the initial stack pointer for
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* reporting the thread's UTCB address.
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*/
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addr_t pd_utcb = Native_config::context_area_virtual_base() +
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Native_config::context_area_virtual_size() -
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get_page_size();
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_sel_exc_base = _pager->exc_pt_sel_client();
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addr_t pd_core_sel = Platform_pd::pd_core_sel();
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addr_t remap_src[] = { _pd->parent_pt_sel() };
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addr_t remap_dst[] = { PT_SEL_PARENT };
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addr_t pd_sel;
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Obj_crd initial_pts(_sel_exc_base, NUM_INITIAL_PT_LOG2);
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uint8_t res;
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/* remap exception portals for first thread */
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for (unsigned i = 0; i < sizeof(remap_dst)/sizeof(remap_dst[0]); i++) {
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if (map_local((Utcb *)Thread_base::myself()->utcb(),
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Obj_crd(remap_src[i], 0),
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Obj_crd(_sel_exc_base + remap_dst[i], 0)))
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return -6;
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}
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pd_sel = cap_selector_allocator()->alloc();
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/* create task */
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res = create_pd(pd_sel, pd_core_sel, initial_pts);
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if (res != NOVA_OK) {
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PERR("create_pd returned %d", res);
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goto cleanup_pd;
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}
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/* create first thread in task */
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enum { THREAD_GLOBAL = true };
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res = create_ec(_sel_ec(), pd_sel, _location.xpos(), pd_utcb, 0, 0,
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THREAD_GLOBAL);
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if (res != NOVA_OK) {
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PERR("create_ec returned %d", res);
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goto cleanup_pd;
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}
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/*
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* We have to assign the pd here, because after create_sc the thread
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* becomes running immediately.
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*/
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_pd->assign_pd(pd_sel);
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_pager->client_set_ec(_sel_ec());
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_pager->initial_eip((addr_t)ip);
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_pager->initial_esp((addr_t)sp);
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/* let the thread run */
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res = create_sc(_sel_sc(), pd_sel, _sel_ec(), Qpd());
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if (res != NOVA_OK) {
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/*
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* Reset pd cap since thread got not running and pd cap will
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* be revoked during cleanup.
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*/
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_pd->assign_pd(Native_thread::INVALID_INDEX);
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_pager->client_set_ec(Native_thread::INVALID_INDEX);
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_pager->initial_eip(0);
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_pager->initial_esp(0);
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PERR("create_sc returned %d", res);
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goto cleanup_ec;
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}
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return 0;
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cleanup_ec:
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/* cap_selector free for _sel_ec is done in de-constructor */
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revoke(Obj_crd(_sel_ec(), 0));
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cleanup_pd:
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revoke(Obj_crd(pd_sel, 0));
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cap_selector_allocator()->free(pd_sel, 0);
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return -7;
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}
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Native_capability Platform_thread::pause()
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{
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if (!_pager) return Native_capability();
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Native_capability notify_sm = _pager->notify_sm();
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if (!notify_sm.valid()) return notify_sm;
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if (_pager->client_recall() != Nova::NOVA_OK)
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return Native_capability();
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/* If the thread is blocked in its own SM, get him out */
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cancel_blocking();
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/* local thread may never get be canceled if it doesn't receive an IPC */
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if (is_worker()) return Native_capability();
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return notify_sm;
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}
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void Platform_thread::resume()
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{
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using namespace Nova;
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if (!is_worker()) {
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uint8_t res = create_sc(_sel_sc(), _pd->pd_sel(), _sel_ec(), Qpd());
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if (res == NOVA_OK) return;
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}
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if (!_pager) return;
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/* Thread was paused beforehand and blocked in pager - wake up pager */
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_pager->wake_up();
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}
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Thread_state Platform_thread::state()
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{
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if (!_pager) throw Cpu_session::State_access_failed();
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Thread_state s;
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if (_pager->copy_thread_state(&s))
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return s;
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if (is_worker())
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s.sp = _pager->initial_esp();
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return s;
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}
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void Platform_thread::state(Thread_state s)
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{
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/* not permitted for main thread */
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if (is_main_thread()) throw Cpu_session::State_access_failed();
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/* you can do it only once */
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if (_sel_exc_base != Native_thread::INVALID_INDEX)
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throw Cpu_session::State_access_failed();
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/*
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* s.sel_exc_base exception base of thread in caller
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* protection domain - not in Core !
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* s.is_vcpu If true it will run as vCPU,
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* otherwise it will be a thread.
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*/
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_sel_exc_base = s.sel_exc_base;
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if (s.is_vcpu) _features |= VCPU;
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}
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void Platform_thread::cancel_blocking()
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{
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if (!_pager) return;
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_pager->client_cancel_blocking();
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}
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void Platform_thread::single_step(bool on)
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{
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if (!_pager) return;
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_pager->single_step(on);
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}
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unsigned long Platform_thread::pager_object_badge() const
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{
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return reinterpret_cast<unsigned long>(_name);
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}
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Weak_ptr<Address_space> Platform_thread::address_space()
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{
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return _pd->Address_space::weak_ptr();
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}
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Platform_thread::Platform_thread(const char *name, unsigned, int thread_id)
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:
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_pd(0), _pager(0), _id_base(cap_selector_allocator()->alloc(1)),
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_sel_exc_base(Native_thread::INVALID_INDEX), _location(boot_cpu(), 0),
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_features(0)
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{
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strncpy(_name, name, sizeof(_name));
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}
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Platform_thread::~Platform_thread()
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{
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using namespace Nova;
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/* free ec and sc caps */
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revoke(Obj_crd(_id_base, 1));
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cap_selector_allocator()->free(_id_base, 1);
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}
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