src/cpu/inorder/thread_context.hh

   1 /*
   2  * Copyright (c) 2007 MIPS Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Korey Sewell
  29  *
  30  */
  31
  32 #ifndef __CPU_INORDER_THREAD_CONTEXT_HH__
  33 #define __CPU_INORDER_THREAD_CONTEXT_HH__
  34
  35 #include "config/the_isa.hh"
  36 #include "cpu/inorder/cpu.hh"
  37 #include "cpu/inorder/thread_state.hh"
  38 #include "cpu/exetrace.hh"
  39 #include "cpu/thread_context.hh"
  40 #include "arch/kernel_stats.hh"
  41
  42 class EndQuiesceEvent;
  43 namespace Kernel {
  44     class Statistics;
  45 };
  46
  47 class TranslatingPort;
  48
  49 /**
  50  * Derived ThreadContext class for use with the InOrderCPU.  It
  51  * provides the interface for any external objects to access a
  52  * single thread's state and some general CPU state.  Any time
  53  * external objects try to update state through this interface,
  54  * the CPU will create an event to squash all in-flight
  55  * instructions in order to ensure state is maintained correctly.
  56  * It must be defined specifically for the InOrderCPU because
  57  * not all architectural state is located within the O3ThreadState
  58  * (such as the commit PC, and registers), and specific actions
  59  * must be taken when using this interface (such as squashing all
  60  * in-flight instructions when doing a write to this interface).
  61  */
  62 class InOrderThreadContext : public ThreadContext
  63 {
  64   public:
  65     InOrderThreadContext() { }
  66
  67     /** Pointer to the CPU. */
  68     InOrderCPU *cpu;
  69
  70     /** Pointer to the thread state that this TC corrseponds to. */
  71     InOrderThreadState *thread;
  72
  73     /** Returns a pointer to the ITB. */
  74     /** @TODO: PERF: Should we bind this to a pointer in constructor? */
  75     TheISA::TLB *getITBPtr() { return cpu->getITBPtr(); }
  76
  77     /** Returns a pointer to the DTB. */
  78     /** @TODO: PERF: Should we bind this to a pointer in constructor? */
  79     TheISA::TLB *getDTBPtr() { return cpu->getDTBPtr(); }
  80
  81     Decoder *getDecoderPtr() { return cpu->getDecoderPtr(); }
  82
  83     System *getSystemPtr() { return cpu->system; }
  84
  85     /** Returns a pointer to this CPU. */
  86     BaseCPU *getCpuPtr() { return cpu; }
  87
  88     /** Returns a pointer to this CPU. */
  89     std::string getCpuName() { return cpu->name(); }
  90
  91     /** Reads this CPU's ID. */
  92     int cpuId() { return cpu->cpuId(); }
  93
  94     int contextId() { return thread->contextId(); }
  95
  96     void setContextId(int id) { thread->setContextId(id); }
  97
  98     /** Returns this thread's ID number. */
  99     int threadId() { return thread->threadId(); }
 100     void setThreadId(int id) { return thread->setThreadId(id); }
 101
 102     uint64_t readMicroPC()
 103     { return 0; }
 104
 105     void setMicroPC(uint64_t val) { };
 106
 107     uint64_t readNextMicroPC()
 108     { return 0; }
 109
 110     void setNextMicroPC(uint64_t val) { };
 111
 112 #if FULL_SYSTEM
 113     /** Returns a pointer to physical memory. */
 114     PhysicalMemory *getPhysMemPtr()
 115     { assert(0); return 0; /*return cpu->physmem;*/ }
 116
 117     /** Returns a pointer to this thread's kernel statistics. */
 118     TheISA::Kernel::Statistics *getKernelStats()
 119     { return thread->kernelStats; }
 120
 121     VirtualPort *getVirtPort();
 122
 123     void connectMemPorts(ThreadContext *tc)
 124     { thread->connectMemPorts(tc); }
 125
 126     /** Dumps the function profiling information.
 127      * @todo: Implement.
 128      */
 129     void dumpFuncProfile();
 130
 131     /** Reads the last tick that this thread was activated on. */
 132     Tick readLastActivate();
 133     /** Reads the last tick that this thread was suspended on. */
 134     Tick readLastSuspend();
 135
 136     /** Clears the function profiling information. */
 137     void profileClear();
 138
 139     /** Samples the function profiling information. */
 140     void profileSample();
 141
 142     /** Returns pointer to the quiesce event. */
 143     EndQuiesceEvent *getQuiesceEvent()
 144     {
 145         return this->thread->quiesceEvent;
 146     }
 147 #else
 148     TranslatingPort *getMemPort() { return thread->getMemPort(); }
 149
 150     /** Returns a pointer to this thread's process. */
 151     Process *getProcessPtr() { return thread->getProcessPtr(); }
 152 #endif
 153
 154     FunctionalPort *getPhysPort() { return thread->getPhysPort(); }
 155
 156     /** Returns this thread's status. */
 157     Status status() const { return thread->status(); }
 158
 159     /** Sets this thread's status. */
 160     void setStatus(Status new_status)
 161     { thread->setStatus(new_status); }
 162
 163     /** Set the status to Active.  Optional delay indicates number of
 164      * cycles to wait before beginning execution. */
 165     void activate(int delay = 1);
 166
 167     /** Set the status to Suspended. */
 168     void suspend(int delay = 0);
 169
 170     /** Set the status to Halted. */
 171     void halt(int delay = 0);
 172
 173     /** Takes over execution of a thread from another CPU. */
 174     void takeOverFrom(ThreadContext *old_context);
 175
 176     /** Registers statistics associated with this TC. */
 177     void regStats(const std::string &name);
 178
 179     /** Serializes state. */
 180     void serialize(std::ostream &os);
 181
 182     /** Unserializes state. */
 183     void unserialize(Checkpoint *cp, const std::string &section);
 184
 185     /** Returns this thread's ID number. */
 186     int getThreadNum() { return thread->threadId(); }
 187
 188     /** Copies the architectural registers from another TC into this TC. */
 189     void copyArchRegs(ThreadContext *src_tc);
 190
 191     /** Resets all architectural registers to 0. */
 192     void clearArchRegs();
 193
 194     /** Reads an integer register. */
 195     uint64_t readIntReg(int reg_idx);
 196
 197     FloatReg readFloatReg(int reg_idx);
 198
 199     FloatRegBits readFloatRegBits(int reg_idx);
 200
 201     uint64_t readRegOtherThread(int misc_reg, ThreadID tid);
 202
 203     /** Sets an integer register to a value. */
 204     void setIntReg(int reg_idx, uint64_t val);
 205
 206     void setFloatReg(int reg_idx, FloatReg val);
 207
 208     void setFloatRegBits(int reg_idx, FloatRegBits val);
 209
 210     void setRegOtherThread(int misc_reg,
 211                                    const MiscReg &val,
 212                                    ThreadID tid);
 213
 214     /** Reads this thread's PC. */
 215     TheISA::PCState pcState()
 216     { return cpu->pcState(thread->threadId()); }
 217
 218     /** Sets this thread's PC. */
 219     void pcState(const TheISA::PCState &val)
 220     { cpu->pcState(val, thread->threadId()); }
 221
 222     Addr instAddr()
 223     { return cpu->instAddr(thread->threadId()); }
 224
 225     Addr nextInstAddr()
 226     { return cpu->nextInstAddr(thread->threadId()); }
 227
 228     MicroPC microPC()
 229     { return cpu->microPC(thread->threadId()); }
 230
 231     /** Reads a miscellaneous register. */
 232     MiscReg readMiscRegNoEffect(int misc_reg)
 233     { return cpu->readMiscRegNoEffect(misc_reg, thread->threadId()); }
 234
 235     /** Reads a misc. register, including any side-effects the
 236      * read might have as defined by the architecture. */
 237     MiscReg readMiscReg(int misc_reg)
 238     { return cpu->readMiscReg(misc_reg, thread->threadId()); }
 239
 240     /** Sets a misc. register. */
 241     void setMiscRegNoEffect(int misc_reg, const MiscReg &val);
 242
 243     /** Sets a misc. register, including any side-effects the
 244      * write might have as defined by the architecture. */
 245     void setMiscReg(int misc_reg, const MiscReg &val);
 246
 247     int flattenIntIndex(int reg)
 248     { return cpu->isa[thread->threadId()].flattenIntIndex(reg); }
 249
 250     int flattenFloatIndex(int reg)
 251     { return cpu->isa[thread->threadId()].flattenFloatIndex(reg); }
 252
 253     void activateContext(int delay)
 254     { cpu->activateContext(thread->threadId(), delay); }
 255
 256     void deallocateContext()
 257     { cpu->deallocateContext(thread->threadId()); }
 258
 259     /** Returns the number of consecutive store conditional failures. */
 260     // @todo: Figure out where these store cond failures should go.
 261     unsigned readStCondFailures()
 262     { return thread->storeCondFailures; }
 263
 264     /** Sets the number of consecutive store conditional failures. */
 265     void setStCondFailures(unsigned sc_failures)
 266     { thread->storeCondFailures = sc_failures; }
 267
 268     // Only really makes sense for old CPU model.  Lots of code
 269     // outside the CPU still checks this function, so it will
 270     // always return false to keep everything working.
 271     /** Checks if the thread is misspeculating.  Because it is
 272      * very difficult to determine if the thread is
 273      * misspeculating, this is set as false. */
 274     bool misspeculating() { return false; }
 275
 276 #if !FULL_SYSTEM
 277     /** Executes a syscall in SE mode. */
 278     void syscall(int64_t callnum)
 279     { return cpu->syscall(callnum, thread->threadId()); }
 280 #endif
 281
 282     /** Reads the funcExeInst counter. */
 283     Counter readFuncExeInst() { return thread->funcExeInst; }
 284
 285     void changeRegFileContext(unsigned param,
 286                                       unsigned val)
 287     { panic("Not supported!"); }
 288 };
 289
 290 #endif