162 lines
4.3 KiB
C++
162 lines
4.3 KiB
C++
/*
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* \brief NOVA-specific implementation of the Thread API for core
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* \author Norman Feske
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* \author Sebastian Sumpf
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* \author Alexander Boettcher
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* \date 2010-01-19
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*/
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/*
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* Copyright (C) 2010-2017 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 Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <base/thread.h>
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#include <base/log.h>
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/* base-internal includes */
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#include <base/internal/stack.h>
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/* NOVA includes */
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#include <nova/syscalls.h>
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/* core includes */
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#include <platform.h>
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#include <nova_util.h>
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#include <trace/source_registry.h>
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using namespace Genode;
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void Thread::_init_platform_thread(size_t, Type type)
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{
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/*
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* This function is called for constructing server activations and pager
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* objects. It allocates capability selectors for the thread's execution
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* context and a synchronization-helper semaphore needed for 'Lock'.
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*/
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using namespace Nova;
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if (type == MAIN)
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{
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/* set EC selector according to NOVA spec */
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native_thread().ec_sel = platform_specific().core_pd_sel() + 1;
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/*
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* Exception base of first thread in core is 0. We have to set
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* it here so that Thread code finds the semaphore of the
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* main thread.
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*/
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native_thread().exc_pt_sel = 0;
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return;
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}
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native_thread().ec_sel = cap_map().insert(1);
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native_thread().exc_pt_sel = cap_map().insert(NUM_INITIAL_PT_LOG2);
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/* create running semaphore required for locking */
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addr_t rs_sel =native_thread().exc_pt_sel + SM_SEL_EC;
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uint8_t res = create_sm(rs_sel, platform_specific().core_pd_sel(), 0);
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if (res != NOVA_OK) {
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error("create_sm returned ", res);
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throw Cpu_session::Thread_creation_failed();
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}
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}
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void Thread::_deinit_platform_thread()
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{
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unmap_local(Nova::Obj_crd(native_thread().ec_sel, 1));
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unmap_local(Nova::Obj_crd(native_thread().exc_pt_sel, Nova::NUM_INITIAL_PT_LOG2));
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cap_map().remove(native_thread().ec_sel, 1, false);
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cap_map().remove(native_thread().exc_pt_sel, Nova::NUM_INITIAL_PT_LOG2, false);
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/* revoke utcb */
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Nova::Rights rwx(true, true, true);
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addr_t utcb = reinterpret_cast<addr_t>(&_stack->utcb());
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Nova::revoke(Nova::Mem_crd(utcb >> 12, 0, rwx));
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}
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void Thread::start()
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{
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/*
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* On NOVA, core almost never starts regular threads. This simply creates a
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* local EC
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*/
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using namespace Nova;
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addr_t sp = _stack->top();
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Utcb &utcb = *reinterpret_cast<Utcb *>(&_stack->utcb());
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Affinity::Location location = _affinity;
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if (!location.valid())
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location = Affinity::Location(boot_cpu(), 0);
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/* create local EC */
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enum { LOCAL_THREAD = false };
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unsigned const kernel_cpu_id = platform_specific().kernel_cpu_id(location.xpos());
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uint8_t res = create_ec(native_thread().ec_sel,
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platform_specific().core_pd_sel(), kernel_cpu_id,
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(mword_t)&utcb, sp, native_thread().exc_pt_sel, LOCAL_THREAD);
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if (res != NOVA_OK) {
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error("create_ec returned ", res, " cpu=", location.xpos());
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throw Cpu_session::Thread_creation_failed();
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}
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/* default: we don't accept any mappings or translations */
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utcb.crd_rcv = Obj_crd();
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utcb.crd_xlt = Obj_crd();
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if (map_local(platform_specific().core_pd_sel(),
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*reinterpret_cast<Nova::Utcb *>(Thread::myself()->utcb()),
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Obj_crd(PT_SEL_PAGE_FAULT, 0),
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Obj_crd(native_thread().exc_pt_sel + PT_SEL_PAGE_FAULT, 0))) {
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error("could not create page fault portal");
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throw Cpu_session::Thread_creation_failed();
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}
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struct Core_trace_source : public Trace::Source::Info_accessor,
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private Trace::Control,
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private Trace::Source
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{
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Thread &thread;
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/**
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* Trace::Source::Info_accessor interface
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*/
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Info trace_source_info() const override
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{
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uint64_t sc_time = 0;
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return { Session_label("core"), thread.name(),
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Trace::Execution_time(sc_time, sc_time), thread._affinity };
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}
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Core_trace_source(Trace::Source_registry ®istry, Thread &t)
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:
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Trace::Control(),
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Trace::Source(*this, *this), thread(t)
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{
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registry.insert(this);
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}
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};
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new (platform().core_mem_alloc())
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Core_trace_source(Trace::sources(), *this);
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}
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void Thread::cancel_blocking()
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{
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using namespace Nova;
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if (sm_ctrl(native_thread().exc_pt_sel + SM_SEL_EC, SEMAPHORE_UP))
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nova_die();
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}
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