142 lines
3.7 KiB
C++
142 lines
3.7 KiB
C++
/*
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* \brief NOVA-specific implementation of the Thread API
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* \author Norman Feske
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* \author Sebastian Sumpf
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* \date 2010-01-19
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*/
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/*
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* Copyright (C) 2010-2012 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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using namespace Genode;
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/**
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* Entry point entered by new threads
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*/
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void Thread_base::_thread_start()
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{
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Genode::Thread_base::myself()->entry();
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Genode::sleep_forever();
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}
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static void request_event_portal(Pager_capability pager_cap,
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int exc_base, int event)
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{
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using namespace Nova;
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Utcb *utcb = (Utcb *)Thread_base::myself()->utcb();
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/* save original receive window */
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Crd orig_crd = utcb->crd_rcv;
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/* request event-handler portal */
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utcb->msg[0] = event;
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utcb->set_msg_word(1);
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utcb->crd_rcv = Obj_crd(exc_base + event, 0);
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int res = call(pager_cap.dst());
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if (res)
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PERR("request of event (%d) capability selector failed", event);
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/* restore original receive window */
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utcb->crd_rcv = orig_crd;
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}
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/*****************
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** Thread base **
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*****************/
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void Thread_base::_init_platform_thread()
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{
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using namespace Nova;
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/*
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* Allocate capability selectors for the thread's execution context,
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* scheduling context, running semaphore and exception handler portals.
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*/
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_tid.ec_sel = cap_selector_allocator()->alloc();
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_tid.sc_sel = cap_selector_allocator()->alloc();
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_tid.rs_sel = cap_selector_allocator()->alloc();
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_tid.pd_sel = cap_selector_allocator()->pd_sel();
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_tid.exc_pt_sel = cap_selector_allocator()->alloc(NUM_INITIAL_PT_LOG2);
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/* create thread at core */
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char buf[48];
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name(buf, sizeof(buf));
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Thread_capability thread_cap = env()->cpu_session()->create_thread(buf);
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/* create new pager object and assign it to the new thread */
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Pager_capability pager_cap = env()->rm_session()->add_client(thread_cap);
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env()->cpu_session()->set_pager(thread_cap, pager_cap);
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/* register initial IP and SP at core */
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mword_t thread_sp = (mword_t)&_context->stack[-4];
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env()->cpu_session()->start(thread_cap, (addr_t)_thread_start, thread_sp);
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request_event_portal(pager_cap, _tid.exc_pt_sel, PT_SEL_STARTUP);
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request_event_portal(pager_cap, _tid.exc_pt_sel, PT_SEL_PAGE_FAULT);
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/* create running semaphore required for locking */
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int res = create_sm(_tid.rs_sel, _tid.pd_sel, 0);
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if (res)
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PERR("create_sm returned %d", res);
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}
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void Thread_base::_deinit_platform_thread()
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{
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Nova::revoke(Nova::Obj_crd(_tid.sc_sel, 0));
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Nova::revoke(Nova::Obj_crd(_tid.ec_sel, 0));
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Nova::revoke(Nova::Obj_crd(_tid.rs_sel, 0));
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/* revoke utcb */
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Nova::Rights rwx(true, true, true);
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Nova::revoke(Nova::Mem_crd((addr_t)Thread_base::myself()->utcb() >> 12, 0, rwx));
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}
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void Thread_base::start()
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{
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using namespace Nova;
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/* create execution context */
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enum { THREAD_CPU_NO = 0, THREAD_GLOBAL = true };
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int res = create_ec(_tid.ec_sel, _tid.pd_sel, THREAD_CPU_NO, (mword_t)&_context->utcb,
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0, _tid.exc_pt_sel, THREAD_GLOBAL);
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if (res)
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PDBG("create_ec returned %d", res);
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/*
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* Create scheduling context
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*
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* With assigning a scheduling context to the execution context, the new
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* thread will immediately start, enter the startup portal, and receives
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* the configured initial IP and SP from core.
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*/
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res = create_sc(_tid.sc_sel, _tid.pd_sel, _tid.ec_sel, Qpd());
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if (res)
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PERR("create_sc returned %d", res);
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}
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void Thread_base::cancel_blocking()
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{
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Nova::sm_ctrl(_tid.rs_sel, Nova::SEMAPHORE_UP);
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}
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