252 lines
6.0 KiB
C++
252 lines
6.0 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) 2009-2012 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/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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using namespace Genode;
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/*********************
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** Platform thread **
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*********************/
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void Platform_thread::set_cpu(unsigned int cpu_no)
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{
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PERR("not yet implemented");
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}
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int Platform_thread::start(void *ip, void *sp, addr_t exc_base, bool vcpu)
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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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enum { PD_UTCB = 0x6000000 };
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_pager->initial_eip((addr_t)ip);
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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 = vcpu ? 0 : round_page(initial_sp);
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_pager->initial_esp(initial_sp);
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if (exc_base == ~0UL) {
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PERR("exception base not specified");
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return -3;
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}
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/**
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* Create semaphore required for Genode locking.
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* It is created at the root pager exception base +
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* SM_SEL_EC_MAIN and can be later on requested by the thread
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* the same way as STARTUP and PAGEFAULT portal.
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*/
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uint8_t res = Nova::create_sm(_pager->exc_pt_sel() +
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SM_SEL_EC_MAIN,
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_pd->pd_sel(), 0);
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if (res != Nova::NOVA_OK) {
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PERR("creation of semaphore for new thread failed %u",
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res);
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return -4;
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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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res = create_ec(_sel_ec(), _pd->pd_sel(), _cpu_no, utcb,
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initial_sp, exc_base, thread_global);
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if (res)
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PERR("creation of new thread failed %u", res);
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return res ? -5 : 0;
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}
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if (_sel_exc_base != ~0UL) {
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PERR("thread already started");
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return -6;
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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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_pager->initial_esp(PD_UTCB + get_page_size());
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_sel_exc_base = cap_selector_allocator()->alloc(NUM_INITIAL_PT_LOG2);
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addr_t pd_core_sel = Platform_pd::pd_core_sel();
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addr_t sm_alloc_sel = _sel_exc_base + PD_SEL_CAP_LOCK;
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addr_t sm_ec_sel = _sel_exc_base + SM_SEL_EC;
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addr_t remap_src[] = { _pager->exc_pt_sel() + PT_SEL_PAGE_FAULT,
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_pd->parent_pt_sel(),
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_pager->exc_pt_sel() + PT_SEL_STARTUP };
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addr_t remap_dst[] = { PT_SEL_PAGE_FAULT,
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PT_SEL_PARENT,
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PT_SEL_STARTUP };
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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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for (unsigned i = 0; i < sizeof(remap_dst)/sizeof(remap_dst[0]); i++) {
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/* locally map portals to initial portal window */
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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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PERR("could not remap portal %lx->%lx",
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remap_src[i], remap_dst[i]);
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goto cleanup_base;
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}
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}
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/* Create lock for cap allocator selector */
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res = create_sm(sm_alloc_sel, pd_core_sel, 1);
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if (res != NOVA_OK) {
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PERR("could not create semaphore for capability allocator");
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goto cleanup_base;
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}
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/* Create lock for EC used by lock_helper */
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res = create_sm(sm_ec_sel, pd_core_sel, 0);
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if (res != NOVA_OK) {
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PERR("could not create semaphore for new thread");
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goto cleanup_base;
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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) {
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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, _cpu_no, PD_UTCB, 0, 0,
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THREAD_GLOBAL);
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if (res) {
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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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/* Let the thread run */
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res = create_sc(_sel_sc(), pd_sel, _sel_ec(), Qpd());
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if (res) {
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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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_pd->assign_pd(~0UL);
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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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cleanup_base:
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revoke(Obj_crd(_sel_exc_base, NUM_INITIAL_PT_LOG2));
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cap_selector_allocator()->free(_sel_exc_base, NUM_INITIAL_PT_LOG2);
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_sel_exc_base = ~0UL;
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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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PDBG("not implemented");
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return Native_capability::invalid_cap();
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}
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void Platform_thread::resume()
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{
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uint8_t res = Nova::create_sc(_sel_sc(), _pd->pd_sel(), _sel_ec(),
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Nova::Qpd());
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if (res)
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PDBG("create_sc returned %u", res);
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}
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int Platform_thread::state(Thread_state *state_dst)
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{
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PWRN("not implemented");
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return -1;
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}
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void Platform_thread::cancel_blocking() { PWRN("not implemented"); }
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unsigned long Platform_thread::pager_object_badge() const { return ~0UL; }
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Platform_thread::Platform_thread(const char *name, unsigned, int thread_id)
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: _pd(0), _pager(0), _id_base(cap_selector_allocator()->alloc(1)),
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_sel_exc_base(~0UL), _cpu_no(0), _is_main_thread(false) { }
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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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/* free exc_base used by main thread */
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if (_sel_exc_base != ~0UL) {
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revoke(Obj_crd(_sel_exc_base, NUM_INITIAL_PT_LOG2));
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cap_selector_allocator()->free(_sel_exc_base,
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NUM_INITIAL_PT_LOG2);
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}
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}
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