This patch is adding a clearer design intent to all objects that would not be complete without a port proxy by making the proxies members rathen than dynamically allocated. In essence, if NULL would not be a valid value for the proxy, then we avoid using a pointer to make this clear. The same approach is used for the methods using these proxies, such as loadSections, that now use references rather than pointers to better reflect the fact that NULL would not be an acceptable value (in fact the code would break and that is how this patch started out). Overall the concept of "using a reference to express unconditional composition where a NULL pointer is never valid" could be done on a much broader scale throughout the code base, but for now it is only done in the locations affected by the proxies.
450 lines
12 KiB
C++
450 lines
12 KiB
C++
/*
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* Copyright (c) 2011-2012 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2003-2006 The Regents of The University of Michigan
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* Copyright (c) 2011 Regents of the University of California
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Steve Reinhardt
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* Lisa Hsu
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* Nathan Binkert
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* Ali Saidi
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* Rick Strong
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*/
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#include "arch/isa_traits.hh"
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#include "arch/remote_gdb.hh"
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#include "arch/utility.hh"
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#include "arch/vtophys.hh"
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#include "base/loader/object_file.hh"
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#include "base/loader/symtab.hh"
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#include "base/trace.hh"
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#include "config/the_isa.hh"
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#include "cpu/thread_context.hh"
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#include "debug/Loader.hh"
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#include "debug/WorkItems.hh"
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#include "kern/kernel_stats.hh"
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#include "mem/physical.hh"
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#include "params/System.hh"
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#include "sim/byteswap.hh"
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#include "sim/debug.hh"
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#include "sim/full_system.hh"
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#include "sim/system.hh"
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using namespace std;
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using namespace TheISA;
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vector<System *> System::systemList;
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int System::numSystemsRunning = 0;
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System::System(Params *p)
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: MemObject(p), _systemPort("system_port", this),
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physmem(p->physmem),
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_numContexts(0),
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pagePtr(0),
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init_param(p->init_param),
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physProxy(_systemPort),
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virtProxy(_systemPort),
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loadAddrMask(p->load_addr_mask),
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nextPID(0),
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memoryMode(p->mem_mode),
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workItemsBegin(0),
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workItemsEnd(0),
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numWorkIds(p->num_work_ids),
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_params(p),
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totalNumInsts(0),
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instEventQueue("system instruction-based event queue")
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{
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// add self to global system list
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systemList.push_back(this);
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/** Keep track of all memories we can execute code out of
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* in our system
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*/
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for (int x = 0; x < p->memories.size(); x++) {
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if (!p->memories[x])
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continue;
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memRanges.push_back(RangeSize(p->memories[x]->start(),
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p->memories[x]->size()));
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}
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if (FullSystem) {
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kernelSymtab = new SymbolTable;
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if (!debugSymbolTable)
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debugSymbolTable = new SymbolTable;
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}
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// Get the generic system master IDs
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MasterID tmp_id M5_VAR_USED;
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tmp_id = getMasterId("writebacks");
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assert(tmp_id == Request::wbMasterId);
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tmp_id = getMasterId("functional");
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assert(tmp_id == Request::funcMasterId);
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tmp_id = getMasterId("interrupt");
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assert(tmp_id == Request::intMasterId);
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}
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System::~System()
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{
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delete kernelSymtab;
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delete kernel;
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for (uint32_t j = 0; j < numWorkIds; j++)
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delete workItemStats[j];
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}
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void
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System::init()
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{
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// check that the system port is connected
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if (!_systemPort.isConnected())
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panic("System port on %s is not connected.\n", name());
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}
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Port*
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System::getPort(const std::string &if_name, int idx)
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{
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// no need to distinguish at the moment (besides checking)
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return &_systemPort;
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}
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void
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System::setMemoryMode(Enums::MemoryMode mode)
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{
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assert(getState() == Drained);
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memoryMode = mode;
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}
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bool System::breakpoint()
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{
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if (remoteGDB.size())
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return remoteGDB[0]->breakpoint();
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return false;
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}
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/**
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* Setting rgdb_wait to a positive integer waits for a remote debugger to
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* connect to that context ID before continuing. This should really
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be a parameter on the CPU object or something...
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*/
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int rgdb_wait = -1;
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int
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System::registerThreadContext(ThreadContext *tc, int assigned)
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{
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int id;
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if (assigned == -1) {
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for (id = 0; id < threadContexts.size(); id++) {
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if (!threadContexts[id])
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break;
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}
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if (threadContexts.size() <= id)
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threadContexts.resize(id + 1);
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} else {
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if (threadContexts.size() <= assigned)
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threadContexts.resize(assigned + 1);
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id = assigned;
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}
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if (threadContexts[id])
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fatal("Cannot have two CPUs with the same id (%d)\n", id);
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threadContexts[id] = tc;
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_numContexts++;
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int port = getRemoteGDBPort();
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if (port) {
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RemoteGDB *rgdb = new RemoteGDB(this, tc);
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GDBListener *gdbl = new GDBListener(rgdb, port + id);
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gdbl->listen();
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if (rgdb_wait != -1 && rgdb_wait == id)
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gdbl->accept();
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if (remoteGDB.size() <= id) {
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remoteGDB.resize(id + 1);
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}
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remoteGDB[id] = rgdb;
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}
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activeCpus.push_back(false);
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return id;
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}
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int
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System::numRunningContexts()
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{
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int running = 0;
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for (int i = 0; i < _numContexts; ++i) {
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if (threadContexts[i]->status() != ThreadContext::Halted)
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++running;
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}
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return running;
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}
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void
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System::initState()
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{
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int i;
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if (FullSystem) {
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for (i = 0; i < threadContexts.size(); i++)
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TheISA::startupCPU(threadContexts[i], i);
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// Moved from the constructor to here since it relies on the
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// address map being resolved in the interconnect
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/**
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* Load the kernel code into memory
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*/
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if (params()->kernel == "") {
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inform("No kernel set for full system simulation. "
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"Assuming you know what you're doing...\n");
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} else {
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// Load kernel code
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kernel = createObjectFile(params()->kernel);
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inform("kernel located at: %s", params()->kernel);
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if (kernel == NULL)
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fatal("Could not load kernel file %s", params()->kernel);
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// Load program sections into memory
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kernel->loadSections(physProxy, loadAddrMask);
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// setup entry points
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kernelStart = kernel->textBase();
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kernelEnd = kernel->bssBase() + kernel->bssSize();
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kernelEntry = kernel->entryPoint();
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// load symbols
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if (!kernel->loadGlobalSymbols(kernelSymtab))
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fatal("could not load kernel symbols\n");
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if (!kernel->loadLocalSymbols(kernelSymtab))
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fatal("could not load kernel local symbols\n");
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if (!kernel->loadGlobalSymbols(debugSymbolTable))
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fatal("could not load kernel symbols\n");
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if (!kernel->loadLocalSymbols(debugSymbolTable))
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fatal("could not load kernel local symbols\n");
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DPRINTF(Loader, "Kernel start = %#x\n", kernelStart);
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DPRINTF(Loader, "Kernel end = %#x\n", kernelEnd);
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DPRINTF(Loader, "Kernel entry = %#x\n", kernelEntry);
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DPRINTF(Loader, "Kernel loaded...\n");
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}
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}
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// increment the number of running systms
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numSystemsRunning++;
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activeCpus.clear();
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if (!FullSystem)
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return;
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for (i = 0; i < threadContexts.size(); i++)
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TheISA::startupCPU(threadContexts[i], i);
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}
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void
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System::replaceThreadContext(ThreadContext *tc, int context_id)
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{
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if (context_id >= threadContexts.size()) {
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panic("replaceThreadContext: bad id, %d >= %d\n",
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context_id, threadContexts.size());
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}
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threadContexts[context_id] = tc;
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if (context_id < remoteGDB.size())
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remoteGDB[context_id]->replaceThreadContext(tc);
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}
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Addr
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System::allocPhysPages(int npages)
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{
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Addr return_addr = pagePtr << LogVMPageSize;
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pagePtr += npages;
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if (pagePtr > physmem->size())
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fatal("Out of memory, please increase size of physical memory.");
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return return_addr;
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}
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Addr
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System::memSize()
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{
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return physmem->size();
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}
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Addr
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System::freeMemSize()
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{
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return physmem->size() - (pagePtr << LogVMPageSize);
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}
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bool
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System::isMemory(const Addr addr) const
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{
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std::list<Range<Addr> >::const_iterator i;
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for (i = memRanges.begin(); i != memRanges.end(); i++) {
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if (*i == addr)
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return true;
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}
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return false;
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}
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void
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System::resume()
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{
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SimObject::resume();
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totalNumInsts = 0;
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}
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void
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System::serialize(ostream &os)
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{
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if (FullSystem)
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kernelSymtab->serialize("kernel_symtab", os);
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SERIALIZE_SCALAR(pagePtr);
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SERIALIZE_SCALAR(nextPID);
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}
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void
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System::unserialize(Checkpoint *cp, const string §ion)
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{
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if (FullSystem)
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kernelSymtab->unserialize("kernel_symtab", cp, section);
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UNSERIALIZE_SCALAR(pagePtr);
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UNSERIALIZE_SCALAR(nextPID);
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}
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void
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System::regStats()
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{
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for (uint32_t j = 0; j < numWorkIds ; j++) {
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workItemStats[j] = new Stats::Histogram();
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stringstream namestr;
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ccprintf(namestr, "work_item_type%d", j);
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workItemStats[j]->init(20)
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.name(name() + "." + namestr.str())
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.desc("Run time stat for" + namestr.str())
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.prereq(*workItemStats[j]);
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}
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}
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void
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System::workItemEnd(uint32_t tid, uint32_t workid)
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{
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std::pair<uint32_t,uint32_t> p(tid, workid);
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if (!lastWorkItemStarted.count(p))
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return;
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Tick samp = curTick() - lastWorkItemStarted[p];
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DPRINTF(WorkItems, "Work item end: %d\t%d\t%lld\n", tid, workid, samp);
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if (workid >= numWorkIds)
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fatal("Got workid greater than specified in system configuration\n");
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workItemStats[workid]->sample(samp);
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lastWorkItemStarted.erase(p);
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}
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void
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System::printSystems()
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{
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vector<System *>::iterator i = systemList.begin();
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vector<System *>::iterator end = systemList.end();
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for (; i != end; ++i) {
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System *sys = *i;
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cerr << "System " << sys->name() << ": " << hex << sys << endl;
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}
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}
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void
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printSystems()
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{
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System::printSystems();
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}
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MasterID
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System::getMasterId(std::string master_name)
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{
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// strip off system name if the string starts with it
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if (master_name.size() > name().size() &&
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master_name.compare(0, name().size(), name()) == 0)
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master_name = master_name.erase(0, name().size() + 1);
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// CPUs in switch_cpus ask for ids again after switching
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for (int i = 0; i < masterIds.size(); i++) {
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if (masterIds[i] == master_name) {
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return i;
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}
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}
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// todo: Check if stats are enabled yet
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// I just don't know a good way to do it
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if (false)
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fatal("Can't request a masterId after regStats(). \
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You must do so in init().\n");
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masterIds.push_back(master_name);
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return masterIds.size() - 1;
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}
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std::string
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System::getMasterName(MasterID master_id)
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{
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if (master_id >= masterIds.size())
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fatal("Invalid master_id passed to getMasterName()\n");
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return masterIds[master_id];
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}
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const char *System::MemoryModeStrings[3] = {"invalid", "atomic",
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"timing"};
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System *
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SystemParams::create()
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{
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return new System(this);
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}
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