ruby: Fix RubyMemory to work with the newer ruby.

src/mem/RubyMemory.py

@@ -35,12 +35,11 @@ class RubyMemory(PhysicalMemory):
     type = 'RubyMemory'
     clock = Param.Clock('1t', "ruby clock speed")
     phase = Param.Latency('0ns', "ruby clock phase")
-    config_file = Param.String("", "path to the Ruby config file")
+    config_file = Param.String("path to the Ruby config file")
-    config_options = Param.String("", "extra Ruby options (one per line)")
     stats_file = Param.String("ruby.stats",
         "file to which ruby dumps its stats")
     num_cpus = Param.Int(1, "Number of CPUs connected to the Ruby memory")
     debug = Param.Bool(False, "Use ruby debug")
-    debug_file = Param.String("",
+    debug_file = Param.String("ruby.debug",
         "path to the Ruby debug output file (stdout if blank)")
 

src/mem/ruby/SConsopts

@@ -36,7 +36,10 @@ if not main['RUBY']:
 sticky_vars.AddVariables(
     BoolVariable('NO_VECTOR_BOUNDS_CHECKS', "Don't do bounds checks", True),
     BoolVariable('RUBY_DEBUG', "Add debugging stuff to Ruby", False),
-    ('GEMS_ROOT', "Add debugging stuff to Ruby", Dir('..').srcnode().abspath))
+    ('GEMS_ROOT', "Add debugging stuff to Ruby", Dir('..').srcnode().abspath),
+    BoolVariable('RUBY_TSO_CHECKER', "Use the Ruby TSO Checker", False)
+    )
 
-export_vars += [ 'NO_VECTOR_BOUNDS_CHECKS', 'RUBY_DEBUG', 'GEMS_ROOT' ]
+export_vars += [ 'NO_VECTOR_BOUNDS_CHECKS', 'RUBY_DEBUG', 'GEMS_ROOT',
+                 'RUBY_TSO_CHECKER' ]
 

src/mem/ruby/storebuffer/storebuffer.cc

@@ -36,7 +36,7 @@
 #include "mem/ruby/storebuffer/storebuffer.hh"
 #include "mem/ruby/common/Global.hh"
 
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
 #include "TsoChecker.hh"
 #endif
 
@@ -46,7 +46,7 @@
 // global map of request id_s to map them back to storebuffer pointers
 map <uint64_t, StoreBuffer *> request_map;
 
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
 Tso::TsoChecker * g_tsoChecker;
 #endif
 
@@ -65,7 +65,7 @@ void hit(int64_t id) {
 
 //*****************************************************************************************
 StoreBuffer::StoreBuffer(uint32 id, uint32 block_bits, int storebuffer_size) {
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
   if (id == 0) {
     g_tsoChecker = new Tso::TsoChecker();
     g_tsoChecker->init(64);
@@ -99,7 +99,7 @@ StoreBuffer::StoreBuffer(uint32 id, uint32 block_bits, int storebuffer_size) {
 
 //******************************************************************************************
 StoreBuffer::~StoreBuffer(){
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
   if (m_id == 0) {
     delete g_tsoChecker;
   }
@@ -272,7 +272,7 @@ void StoreBuffer::returnMatchedData(struct RubyRequest request) {
     ASSERT(checkForLoadHit(request) != NO_MATCH);
     physical_address_t lineaddr = physical_address & m_block_mask;
     bool found = false;
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
     Tso::TsoCheckerCmd * cmd;
 #endif
     deque<struct SBEntry>::iterator satisfying_store;
@@ -280,7 +280,7 @@ void StoreBuffer::returnMatchedData(struct RubyRequest request) {
       if ((it->m_request.paddr & m_block_mask) == lineaddr) {
         if (!found) {
           found = true;
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
           satisfying_store = it;
           cmd = new Tso::TsoCheckerCmd(m_id, // this thread id
                             iseq, // instruction sequence
@@ -313,7 +313,7 @@ void StoreBuffer::returnMatchedData(struct RubyRequest request) {
       }
     }
 
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
     uint64_t tso_data = 0;
     memcpy(&tso_data, request.data, request.len);
     cmd->setData(tso_data);
@@ -400,7 +400,7 @@ void StoreBuffer::complete(uint64_t id) {
         m_buffer_size--;
         ASSERT(m_buffer_size >= 0);
 
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
         int len = outstanding_requests.find(id)->second.len;
         uint64_t data = 0;
         memcpy(&data, from_buffer.m_request.data, 4);
@@ -462,7 +462,7 @@ void StoreBuffer::complete(uint64_t id) {
 #endif
     } // end if (type == ST)
     else if (type == RubyRequestType_LD) {
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
       RubyRequest request = outstanding_requests.find(id)->second;
       uint64_t data = 0;
       memcpy(&data, request.data, request.len);
@@ -511,7 +511,7 @@ void StoreBuffer::complete(uint64_t id) {
   }
 }
 
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
 void StoreBuffer::insertTsoLL(Tso::TsoCheckerCmd * cmd) {
   uint64_t count = cmd->getIseq();
   Tso::TsoCheckerCmd * current = NULL;

src/mem/ruby/storebuffer/storebuffer.hh

@@ -36,7 +36,7 @@
 #include "mem/ruby/storebuffer/hfa.hh"
 #include "mem/ruby/libruby.hh"
 
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
 #include "TsoCheckerCmd.hh"
 #endif
 
@@ -53,13 +53,13 @@ enum load_match { NO_MATCH, PARTIAL_MATCH, FULL_MATCH };
 
 struct SBEntry {
   struct RubyRequest m_request;
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
   Tso::TsoCheckerCmd * m_next_ptr;
 #endif
   SBEntry(struct RubyRequest request, void * ptr)
       : m_request(request)
     {
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
         m_next_ptr = (Tso::TsoCheckerCmd*) ptr;
 #endif
     }
@@ -101,7 +101,7 @@ class StoreBuffer {
   /// prints out the contents of the Write Buffer
   void print();
 
-#ifdef RUBY_TSO_CHECKER
+#if RUBY_TSO_CHECKER
   /// if load completes before store, insert correctly to be issued to TSOChecker
   void insertTsoLL(Tso::TsoCheckerCmd * cmd);
 #endif

src/mem/rubymem.cc

@@ -33,9 +33,11 @@
 
 #include "arch/isa_traits.hh"
 #include "base/output.hh"
+#include "base/str.hh"
 #include "base/types.hh"
 #include "mem/ruby/common/Debug.hh"
-#include "mem/ruby/init.hh"
+#include "mem/ruby/libruby.hh"
+#include "mem/ruby/system/RubyPort.hh"
 #include "mem/ruby/system/Sequencer.hh"
 #include "mem/ruby/system/System.hh"
 #include "mem/rubymem.hh"
@@ -45,33 +47,54 @@
 using namespace std;
 using namespace TheISA;
 
+map<int64_t, PacketPtr> RubyMemory::pending_requests;
+
 RubyMemory::RubyMemory(const Params *p)
   : PhysicalMemory(p)
 {
-    config_file = p->config_file;
-    config_options = p->config_options;
-    stats_file = p->stats_file;
-    num_cpus = p->num_cpus;
     ruby_clock = p->clock;
     ruby_phase = p->phase;
 
-    debug = p->debug;
+    ifstream config(p->config_file.c_str());
-    debug_file = p->debug_file;
+
+    vector<RubyObjConf> sys_conf;
+    while (!config.eof()) {
+        char buffer[4096];
+        config.getline(buffer, sizeof(buffer));
+        string line = buffer;
+        if (line.empty())
+            continue;
+        vector<string> tokens;
+        tokenize(tokens, line, ' ');
+        assert(tokens.size() >= 2);
+        vector<string> argv;
+        for (size_t i=2; i<tokens.size(); i++) {
+            std::replace(tokens[i].begin(), tokens[i].end(), '%', ' ');
+            std::replace(tokens[i].begin(), tokens[i].end(), '#', '\n');
+            argv.push_back(tokens[i]);
+        }
+        sys_conf.push_back(RubyObjConf(tokens[0], tokens[1], argv));
+        tokens.clear();
+        argv.clear();
+    }
+
+    RubySystem::create(sys_conf);
+
+    for (int i = 0; i < params()->num_cpus; i++) {
+        RubyPort *p = RubySystem::getPort(csprintf("Sequencer_%d", i),
+                                          ruby_hit_callback);
+        ruby_ports.push_back(p);
+    }
 }
 
 void
 RubyMemory::init()
 {
-    init_variables();
+    if (params()->debug) {
-    g_NUM_PROCESSORS = num_cpus;
-
-    init_simulator(this);
-
-    if (debug) {
         g_debug_ptr->setVerbosityString("high");
         g_debug_ptr->setDebugTime(1);
-        if (debug_file != "") {
+        if (!params()->debug_file.empty()) {
-             g_debug_ptr->setDebugOutputFile("ruby.debug");
+            g_debug_ptr->setDebugOutputFile(params()->debug_file.c_str());
         }
     }
 
@@ -104,23 +127,21 @@ RubyMemory::init()
 }
 
 //called by rubyTickEvent
-void RubyMemory::tick() {
+void
-    g_eventQueue_ptr->triggerEvents(g_eventQueue_ptr->getTime() + 1);
+RubyMemory::tick()
-    schedule(rubyTickEvent, curTick + ruby_clock); //dsm: clock_phase was added here. This is wrong, the phase is only added on the first tick
+{
+    RubyEventQueue *eq = RubySystem::getEventQueue();
+    eq->triggerEvents(eq->getTime() + 1);
+    schedule(rubyTickEvent, curTick + ruby_clock);
 }
 
-
+RubyMemory::~RubyMemory()
-RubyMemory::~RubyMemory() {
+{
-    delete g_system_ptr;
 }
 
 void
-RubyMemory::hitCallback(Packet* pkt)
+RubyMemory::hitCallback(PacketPtr pkt, Port *port)
 {
-    RubyMemoryPort* port = m_packet_to_port_map[pkt];
-    assert(port != NULL);
-    m_packet_to_port_map.erase(pkt);
-
     DPRINTF(MemoryAccess, "Hit callback\n");
 
     bool needsResponse = pkt->needsResponse();
@@ -146,7 +167,7 @@ RubyMemory::getPort(const std::string &if_name, int idx)
     // with places where this function is called from C++.  I'd prefer
     // to move all these into Python someday.
     if (if_name == "functional") {
-        return new RubyMemoryPort(csprintf("%s-functional", name()), this);
+        return new Port(csprintf("%s-functional", name()), this);
     }
 
     if (if_name != "port") {
@@ -161,22 +182,20 @@ RubyMemory::getPort(const std::string &if_name, int idx)
         panic("RubyMemory::getPort: port %d already assigned", idx);
     }
 
-    RubyMemoryPort *port =
+    Port *port = new Port(csprintf("%s-port%d", name(), idx), this);
-        new RubyMemoryPort(csprintf("%s-port%d", name(), idx), this);
 
     ports[idx] = port;
     return port;
 }
 
-RubyMemory::RubyMemoryPort::RubyMemoryPort(const std::string &_name,
+RubyMemory::Port::Port(const std::string &_name, RubyMemory *_memory)
-                                       RubyMemory *_memory)
     : PhysicalMemory::MemoryPort::MemoryPort(_name, _memory)
 {
     ruby_mem = _memory;
 }
 
 bool
-RubyMemory::RubyMemoryPort::recvTiming(PacketPtr pkt)
+RubyMemory::Port::recvTiming(PacketPtr pkt)
 {
     DPRINTF(MemoryAccess, "Timing access caught\n");
 
@@ -197,33 +216,83 @@ RubyMemory::RubyMemoryPort::recvTiming(PacketPtr pkt)
         return true;
     }
 
-    ruby_mem->m_packet_to_port_map[pkt] = this;
+    // Save the port in the sender state object
+    pkt->senderState = new SenderState(this, pkt->senderState);
 
-    Sequencer* sequencer = g_system_ptr->getSequencer(pkt->req->contextId());
+    RubyRequestType type = RubyRequestType_NULL;
+    Addr pc = 0;
+    if (pkt->isRead()) {
+        if (pkt->req->isInstFetch()) {
+            type = RubyRequestType_IFETCH;
+            pc = pkt->req->getPC();
+        } else {
+            type = RubyRequestType_LD; 
+        }
+    } else if (pkt->isWrite()) {
+        type = RubyRequestType_ST;
+    } else if (pkt->isReadWrite()) {
+        type = RubyRequestType_RMW;
+    }
 
-    if ( ! sequencer->isReady(pkt) ) {
+    RubyRequest ruby_request(pkt->getAddr(), pkt->getPtr<uint8_t>(),
-      DPRINTF(MemoryAccess, "Sequencer isn't ready yet!!\n");
+                             pkt->getSize(), pc, type,
+                             RubyAccessMode_Supervisor);
+
+    // Submit the ruby request
+    RubyPort *ruby_port = ruby_mem->ruby_ports[pkt->req->contextId()];
+    int64_t req_id = ruby_port->makeRequest(ruby_request);
+    if (req_id == -1) {
+        RubyMemory::SenderState *senderState =
+            safe_cast<RubyMemory::SenderState *>(pkt->senderState);
+
+        // pop the sender state from the packet
+        pkt->senderState = senderState->saved;
+        delete senderState;
         return false;
     }
 
-    DPRINTF(MemoryAccess, "Issuing makeRequest\n");
+    // Save the request for the callback
+    RubyMemory::pending_requests[req_id] = pkt;
 
-    sequencer->makeRequest(pkt);
     return true;
 }
 
 void
-RubyMemory::RubyMemoryPort::sendTiming(PacketPtr pkt)
+ruby_hit_callback(int64_t req_id)
+{
+    typedef map<int64_t, PacketPtr> map_t;
+    map_t &prm = RubyMemory::pending_requests;
+
+    map_t::iterator i = prm.find(req_id);
+    if (i == prm.end())
+        panic("could not find pending request %d\n", req_id);
+
+    PacketPtr pkt = i->second;
+    prm.erase(i);
+
+    RubyMemory::SenderState *senderState =
+        safe_cast<RubyMemory::SenderState *>(pkt->senderState);
+    RubyMemory::Port *port = senderState->port;
+    
+    // pop the sender state from the packet
+    pkt->senderState = senderState->saved;
+    delete senderState;
+
+    port->ruby_mem->hitCallback(pkt, port);
+}
+
+void
+RubyMemory::Port::sendTiming(PacketPtr pkt)
 {
     schedSendTiming(pkt, curTick + 1); //minimum latency, must be > 0
 }
 
 void RubyMemory::printConfigStats()
 {
-    std::ostream *os = simout.create(stats_file);
+    std::ostream *os = simout.create(params()->stats_file);
-    g_system_ptr->printConfig(*os);
+    RubySystem::printConfig(*os);
     *os << endl;
-    g_system_ptr->printStats(*os);
+    RubySystem::printStats(*os);
 }
 
 

src/mem/rubymem.hh

@@ -32,20 +32,26 @@
 #define __RUBY_MEMORY_HH__
 
 #include <map>
+#include <vector>
 
-#include "mem/physical.hh"
-#include "params/RubyMemory.hh"
 #include "base/callback.hh"
-#include "mem/ruby/common/Driver.hh"
+#include "mem/packet.hh"
+#include "mem/physical.hh"
+#include "mem/ruby/system/RubyPort.hh"
+#include "params/RubyMemory.hh"
 
-class RubyMemory : public PhysicalMemory, public Driver
+class RubyMemory : public PhysicalMemory
 {
-    class RubyMemoryPort : public MemoryPort
+  public:
+    std::vector<RubyPort *> ruby_ports;
+    class Port : public MemoryPort
     {
-        RubyMemory* ruby_mem;
+        friend void ruby_hit_callback(int64_t req_id);
+
+        RubyMemory *ruby_mem;
 
       public:
-        RubyMemoryPort(const std::string &_name, RubyMemory *_memory);
+        Port(const std::string &_name, RubyMemory *_memory);
         void sendTiming(PacketPtr pkt);
 
       protected:
@@ -64,6 +70,15 @@ class RubyMemory : public PhysicalMemory, public Driver
         virtual const char *description() const { return "ruby tick"; }
     };
 
+    struct SenderState : public Packet::SenderState
+    {
+        Port *port;
+        Packet::SenderState *saved;
+
+        SenderState(Port *p, Packet::SenderState *s = NULL)
+            : port(p), saved(s)
+        {}
+    };
 
   private:
     // prevent copying of a RubyMemory object
@@ -77,14 +92,23 @@ class RubyMemory : public PhysicalMemory, public Driver
     RubyMemory(const Params *p);
     virtual ~RubyMemory();
 
+    const Params *
+    params() const
+    {
+        return safe_cast<const Params *>(_params);
+    }
+
   public:
-    virtual Port *getPort(const std::string &if_name, int idx = -1);
+    virtual ::Port *getPort(const std::string &if_name, int idx = -1);
     void virtual init();
 
     //Ruby-related specifics
-    void printConfigStats(); //dsm: Maybe this function should disappear once the configuration options change & M5 determines the stats file to use
+    void printConfigStats(); //dsm: Maybe this function should
+                             //disappear once the configuration
+                             //options change & M5 determines the
+                             //stats file to use
 
-    void hitCallback(Packet* pkt);  // called by the Ruby sequencer
+    void hitCallback(PacketPtr pkt, Port *port);
 
     void printStats(std::ostream & out) const;
     void clearStats();
@@ -93,15 +117,15 @@ class RubyMemory : public PhysicalMemory, public Driver
     void tick();
 
   private:
-    //Parameters passed
+    Tick ruby_clock;
-    std::string config_file, config_options, stats_file, debug_file;
+    Tick ruby_phase;
-    bool debug;
-    int num_cpus;
-    Tick ruby_clock, ruby_phase;
 
-    std::map<Packet*, RubyMemoryPort*> m_packet_to_port_map;
+  public:
+    static std::map<int64_t, PacketPtr> pending_requests;
 };
 
+void ruby_hit_callback(int64_t);
+
 class RubyExitCallback : public Callback
 {
   private:

tests/configs/memtest-ruby.py

@@ -34,9 +34,12 @@ from m5.objects import *
 nb_cores = 8
 cpus = [ MemTest() for i in xrange(nb_cores) ]
 
+import ruby_config
+ruby_memory = ruby_config.generate("MI_example-homogeneous.rb", nb_cores)
+
 # system simulated
 system = System(cpu = cpus, funcmem = PhysicalMemory(),
-                physmem = RubyMemory(num_cpus=nb_cores),
+                physmem = ruby_memory,
                 membus = Bus(clock="500GHz", width=16))
 
 for cpu in cpus:

tests/configs/o3-timing-mp-ruby.py

@@ -33,9 +33,11 @@ m5.AddToPath('../configs/common')
 nb_cores = 4
 cpus = [ DerivO3CPU(cpu_id=i) for i in xrange(nb_cores) ]
 
+import ruby_config
+ruby_memory = ruby_config.generate("MI_example-homogeneous.rb", nb_cores)
+
 # system simulated
-system = System(cpu = cpus, physmem = RubyMemory(num_cpus=nb_cores),
+system = System(cpu = cpus, physmem = ruby_memory, membus = Bus())
-                membus = Bus())
 
 for cpu in cpus:
     cpu.connectMemPorts(system.membus)

tests/configs/o3-timing-ruby.py

@@ -31,11 +31,14 @@ from m5.objects import *
 m5.AddToPath('../configs/common')
 
 
+import ruby_config
+ruby_memory = ruby_config.generate("MI_example-homogeneous.rb", 1)
+
 cpu = DerivO3CPU(cpu_id=0)
 cpu.clock = '2GHz'
 
 system = System(cpu = cpu,
-                physmem = RubyMemory(),
+                physmem = ruby_memory,
                 membus = Bus())
 system.physmem.port = system.membus.port
 cpu.connectMemPorts(system.membus)

tests/configs/ruby_config.py

@@ -0,0 +1,20 @@
+import os
+import subprocess
+
+from os.path import dirname, join as joinpath
+
+import m5
+
+def generate(config_file, cores=1, memories=1, memory_size=1024):
+    default = joinpath(dirname(__file__), '../../src/mem/ruby/config')
+    ruby_config = os.environ.get('RUBY_CONFIG', default)
+    args = [ "ruby", "-I", ruby_config, joinpath(ruby_config, "print_cfg.rb"),
+             "-r", joinpath(ruby_config, config_file), "-p", str(cores),
+             "-m", str(memories), "-s", str(memory_size)]
+
+    temp_config = joinpath(m5.options.outdir, "ruby.config")
+    ret = subprocess.call(args, stdout=file(temp_config, "w"))
+    if ret != 0:
+        raise RuntimeError, "subprocess failed!"
+
+    return m5.objects.RubyMemory(config_file=temp_config, num_cpus=cores)

tests/configs/simple-atomic-mp-ruby.py

@@ -33,9 +33,11 @@ from m5.objects import *
 nb_cores = 4
 cpus = [ AtomicSimpleCPU(cpu_id=i) for i in xrange(nb_cores) ]
 
+import ruby_config
+ruby_memory = ruby_config.generate("MI_example-homogeneous.rb", nb_cores)
+
 # system simulated
-system = System(cpu = cpus, physmem = RubyMemory(num_cpus=nb_cores),
+system = System(cpu = cpus, physmem = ruby_memory, membus = Bus())
-                membus = Bus())
 
 # add L1 caches
 for cpu in cpus:

tests/configs/simple-atomic-ruby.py

@@ -29,8 +29,11 @@
 import m5
 from m5.objects import *
 
+import ruby_config
+ruby_memory = ruby_config.generate("MI_example-homogeneous.rb", 1)
+
 system = System(cpu = AtomicSimpleCPU(cpu_id=0),
-                physmem = RubyMemory(),
+                physmem = ruby_memory,
                 membus = Bus())
 system.physmem.port = system.membus.port
 system.cpu.connectMemPorts(system.membus)

tests/configs/simple-timing-mp-ruby.py

@@ -32,9 +32,11 @@ from m5.objects import *
 nb_cores = 4
 cpus = [ TimingSimpleCPU(cpu_id=i) for i in xrange(nb_cores) ]
 
+import ruby_config
+ruby_memory = ruby_config.generate("MI_example-homogeneous.rb", nb_cores)
+
 # system simulated
-system = System(cpu = cpus, physmem = RubyMemory(num_cpus=nb_cores),
+system = System(cpu = cpus, physmem = ruby_memory, membus = Bus())
-                membus = Bus())
 
 # add L1 caches
 for cpu in cpus:

tests/configs/simple-timing-ruby.py

@@ -29,9 +29,12 @@
 import m5
 from m5.objects import *
 
+import ruby_config
+ruby_memory = ruby_config.generate("MI_example-homogeneous.rb", 1)
+
 cpu = TimingSimpleCPU(cpu_id=0)
 system = System(cpu = cpu,
-                physmem = RubyMemory(),
+                physmem = ruby_memory,
                 membus = Bus())
 system.physmem.port = system.membus.port
 cpu.connectMemPorts(system.membus)

tests/run.py

@@ -28,6 +28,9 @@
 
 import os
 import sys
+
+from os.path import join as joinpath
+
 import m5
 
 # Since we're in batch mode, dont allow tcp socket connections
@@ -41,32 +44,33 @@ tests_root = os.path.dirname(__file__)
 if os.path.isdir('/dist/m5/regression/test-progs'):
     test_progs = '/dist/m5/regression/test-progs'
 else:
-    test_progs = os.path.join(tests_root, 'test-progs')
+    test_progs = joinpath(tests_root, 'test-progs')
 
 # generate path to binary file
 def binpath(app, file=None):
     # executable has same name as app unless specified otherwise
     if not file:
         file = app
-    return os.path.join(test_progs, app, 'bin', isa, opsys, file)
+    return joinpath(test_progs, app, 'bin', isa, opsys, file)
 
 # generate path to input file
 def inputpath(app, file=None):
     # input file has same name as app unless specified otherwise
     if not file:
         file = app
-    return os.path.join(test_progs, app, 'input', file)
+    return joinpath(test_progs, app, 'input', file)
 
 # build configuration
-execfile(os.path.join(tests_root, 'configs', config + '.py'))
+sys.path.append(joinpath(tests_root, 'configs'))
+execfile(joinpath(tests_root, 'configs', config + '.py'))
 
 # set default maxtick... script can override
 # -1 means run forever
 maxtick = m5.MaxTick
 
 # tweak configuration for specific test
-
+sys.path.append(joinpath(tests_root, category, name))
-execfile(os.path.join(tests_root, category, name, 'test.py'))
+execfile(joinpath(tests_root, category, name, 'test.py'))
 
 # instantiate configuration
 m5.instantiate(root)