120 lines
3.4 KiB
C++
120 lines
3.4 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) 2010-2013 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/cap_sel_alloc.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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/* NOVA includes */
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#include <nova/syscalls.h>
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/* core includes */
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#include <nova_util.h>
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#include <platform_pd.h>
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using namespace Genode;
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void Thread_base::_init_platform_thread()
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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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_tid.ec_sel = cap_selector_allocator()->alloc();
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_tid.exc_pt_sel = cap_selector_allocator()->alloc(NUM_INITIAL_PT_LOG2);
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addr_t pd_sel = Platform_pd::pd_core_sel();
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/* create running semaphore required for locking */
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addr_t rs_sel =_tid.exc_pt_sel + SM_SEL_EC;
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uint8_t res = create_sm(rs_sel, pd_sel, 0);
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if (res != NOVA_OK) {
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PERR("create_sm returned %u", 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_base::_deinit_platform_thread()
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{
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unmap_local(Nova::Obj_crd(_tid.ec_sel, 0));
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unmap_local(Nova::Obj_crd(_tid.exc_pt_sel, Nova::NUM_INITIAL_PT_LOG2));
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cap_selector_allocator()->free(_tid.ec_sel, 0);
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cap_selector_allocator()->free(_tid.exc_pt_sel,
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Nova::NUM_INITIAL_PT_LOG2);
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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>(&_context->utcb);
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Nova::revoke(Nova::Mem_crd(utcb >> 12, 0, rwx));
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}
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void Thread_base::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 = reinterpret_cast<addr_t>(&_context->stack[-4]);
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sp &= ~0xf; /* align initial stack to 16 byte boundary */
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addr_t utcb = reinterpret_cast<addr_t>(&_context->utcb);
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Utcb * utcb_obj = reinterpret_cast<Utcb *>(&_context->utcb);
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addr_t pd_sel = Platform_pd::pd_core_sel();
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Affinity::Location location = reinterpret_cast<Affinity::Location *>(stack_top())[-1];
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/* server code sets this value */
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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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uint8_t res = create_ec(_tid.ec_sel, pd_sel, location.xpos(),
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utcb, sp, _tid.exc_pt_sel, LOCAL_THREAD);
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if (res != NOVA_OK) {
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PERR("create_ec returned %d", res);
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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_obj->crd_rcv = Obj_crd();
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utcb_obj->crd_xlt = Obj_crd();
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if (map_local(reinterpret_cast<Nova::Utcb *>(Thread_base::myself()->utcb()),
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Obj_crd(PT_SEL_PAGE_FAULT, 0),
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Obj_crd(_tid.exc_pt_sel + PT_SEL_PAGE_FAULT, 0))) {
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PERR("could not create page fault portal");
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throw Cpu_session::Thread_creation_failed();
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}
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}
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void Thread_base::cancel_blocking()
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{
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using namespace Nova;
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if (sm_ctrl(_tid.exc_pt_sel + SM_SEL_EC, SEMAPHORE_UP))
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nova_die();
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}
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