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 /**
  48  * Derived ThreadContext class for use with the InOrderCPU.  It
  49  * provides the interface for any external objects to access a
  50  * single thread's state and some general CPU state.  Any time
  51  * external objects try to update state through this interface,
  52  * the CPU will create an event to squash all in-flight
  53  * instructions in order to ensure state is maintained correctly.
  54  * It must be defined specifically for the InOrderCPU because
  55  * not all architectural state is located within the O3ThreadState
  56  * (such as the commit PC, and registers), and specific actions
  57  * must be taken when using this interface (such as squashing all
  58  * in-flight instructions when doing a write to this interface).
  59  */
  60 class InOrderThreadContext : public ThreadContext
  61 {
  62   public:
  63     InOrderThreadContext() { }
  64
  65     /** Pointer to the CPU. */
  66     InOrderCPU *cpu;
  67
  68     /** Pointer to the thread state that this TC corrseponds to. */
  69     InOrderThreadState *thread;
  70
  71     /** Returns a pointer to the ITB. */
  72     /** @TODO: PERF: Should we bind this to a pointer in constructor? */
  73     TheISA::TLB *getITBPtr() { return cpu->getITBPtr(); }
  74
  75     /** Returns a pointer to the DTB. */
  76     /** @TODO: PERF: Should we bind this to a pointer in constructor? */
  77     TheISA::TLB *getDTBPtr() { return cpu->getDTBPtr(); }
  78
  79     Decoder *getDecoderPtr() { return cpu->getDecoderPtr(); }
  80
  81     System *getSystemPtr() { return cpu->system; }
  82
  83     /** Returns a pointer to this CPU. */
  84     BaseCPU *getCpuPtr() { return cpu; }
  85
  86     /** Returns a pointer to this CPU. */
  87     std::string getCpuName() { return cpu->name(); }
  88
  89     /** Reads this CPU's ID. */
  90     int cpuId() { return cpu->cpuId(); }
  91
  92     int contextId() { return thread->contextId(); }
  93
  94     void setContextId(int id) { thread->setContextId(id); }
  95
  96     /** Returns this thread's ID number. */
  97     int threadId() { return thread->threadId(); }
  98     void setThreadId(int id) { return thread->setThreadId(id); }
  99
 100     uint64_t readMicroPC()
 101     { return 0; }
 102
 103     void setMicroPC(uint64_t val) { };
 104
 105     uint64_t readNextMicroPC()
 106     { return 0; }
 107
 108     void setNextMicroPC(uint64_t val) { };
 109
 110 #if FULL_SYSTEM
 111     /** Returns a pointer to physical memory. */
 112     PhysicalMemory *getPhysMemPtr()
 113     { assert(0); return 0; /*return cpu->physmem;*/ }
 114
 115     /** Returns a pointer to this thread's kernel statistics. */
 116     TheISA::Kernel::Statistics *getKernelStats()
 117     { return thread->kernelStats; }
 118
 119     PortProxy* getPhysProxy() { return thread->getPhysProxy(); }
 120
 121     FSTranslatingPortProxy* getVirtProxy();
 122
 123     void initMemProxies(ThreadContext *tc)
 124     { thread->initMemProxies(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     SETranslatingPortProxy* getMemProxy() { return thread->getMemProxy(); }
 149
 150     /** Returns a pointer to this thread's process. */
 151     Process *getProcessPtr() { return thread->getProcessPtr(); }
 152 #endif
 153
 154     /** Returns this thread's status. */
 155     Status status() const { return thread->status(); }
 156
 157     /** Sets this thread's status. */
 158     void setStatus(Status new_status)
 159     { thread->setStatus(new_status); }
 160
 161     /** Set the status to Active.  Optional delay indicates number of
 162      * cycles to wait before beginning execution. */
 163     void activate(int delay = 1);
 164
 165     /** Set the status to Suspended. */
 166     void suspend(int delay = 0);
 167
 168     /** Set the status to Halted. */
 169     void halt(int delay = 0);
 170
 171     /** Takes over execution of a thread from another CPU. */
 172     void takeOverFrom(ThreadContext *old_context);
 173
 174     /** Registers statistics associated with this TC. */
 175     void regStats(const std::string &name);
 176
 177     /** Serializes state. */
 178     void serialize(std::ostream &os);
 179
 180     /** Unserializes state. */
 181     void unserialize(Checkpoint *cp, const std::string &section);
 182
 183     /** Returns this thread's ID number. */
 184     int getThreadNum() { return thread->threadId(); }
 185
 186     /** Copies the architectural registers from another TC into this TC. */
 187     void copyArchRegs(ThreadContext *src_tc);
 188
 189     /** Resets all architectural registers to 0. */
 190     void clearArchRegs();
 191
 192     /** Reads an integer register. */
 193     uint64_t readIntReg(int reg_idx);
 194
 195     FloatReg readFloatReg(int reg_idx);
 196
 197     FloatRegBits readFloatRegBits(int reg_idx);
 198
 199     uint64_t readRegOtherThread(int misc_reg, ThreadID tid);
 200
 201     /** Sets an integer register to a value. */
 202     void setIntReg(int reg_idx, uint64_t val);
 203
 204     void setFloatReg(int reg_idx, FloatReg val);
 205
 206     void setFloatRegBits(int reg_idx, FloatRegBits val);
 207
 208     void setRegOtherThread(int misc_reg,
 209                                    const MiscReg &val,
 210                                    ThreadID tid);
 211
 212     /** Reads this thread's PC. */
 213     TheISA::PCState pcState()
 214     { return cpu->pcState(thread->threadId()); }
 215
 216     /** Sets this thread's PC. */
 217     void pcState(const TheISA::PCState &val)
 218     { cpu->pcState(val, thread->threadId()); }
 219
 220     Addr instAddr()
 221     { return cpu->instAddr(thread->threadId()); }
 222
 223     Addr nextInstAddr()
 224     { return cpu->nextInstAddr(thread->threadId()); }
 225
 226     MicroPC microPC()
 227     { return cpu->microPC(thread->threadId()); }
 228
 229     /** Reads a miscellaneous register. */
 230     MiscReg readMiscRegNoEffect(int misc_reg)
 231     { return cpu->readMiscRegNoEffect(misc_reg, thread->threadId()); }
 232
 233     /** Reads a misc. register, including any side-effects the
 234      * read might have as defined by the architecture. */
 235     MiscReg readMiscReg(int misc_reg)
 236     { return cpu->readMiscReg(misc_reg, thread->threadId()); }
 237
 238     /** Sets a misc. register. */
 239     void setMiscRegNoEffect(int misc_reg, const MiscReg &val);
 240
 241     /** Sets a misc. register, including any side-effects the
 242      * write might have as defined by the architecture. */
 243     void setMiscReg(int misc_reg, const MiscReg &val);
 244
 245     int flattenIntIndex(int reg)
 246     { return cpu->isa[thread->threadId()].flattenIntIndex(reg); }
 247
 248     int flattenFloatIndex(int reg)
 249     { return cpu->isa[thread->threadId()].flattenFloatIndex(reg); }
 250
 251     void activateContext(int delay)
 252     { cpu->activateContext(thread->threadId(), delay); }
 253
 254     void deallocateContext()
 255     { cpu->deallocateContext(thread->threadId()); }
 256
 257     /** Returns the number of consecutive store conditional failures. */
 258     // @todo: Figure out where these store cond failures should go.
 259     unsigned readStCondFailures()
 260     { return thread->storeCondFailures; }
 261
 262     /** Sets the number of consecutive store conditional failures. */
 263     void setStCondFailures(unsigned sc_failures)
 264     { thread->storeCondFailures = sc_failures; }
 265
 266     // Only really makes sense for old CPU model.  Lots of code
 267     // outside the CPU still checks this function, so it will
 268     // always return false to keep everything working.
 269     /** Checks if the thread is misspeculating.  Because it is
 270      * very difficult to determine if the thread is
 271      * misspeculating, this is set as false. */
 272     bool misspeculating() { return false; }
 273
 274 #if !FULL_SYSTEM
 275     /** Executes a syscall in SE mode. */
 276     void syscall(int64_t callnum)
 277     { return cpu->syscall(callnum, thread->threadId()); }
 278 #endif
 279
 280     /** Reads the funcExeInst counter. */
 281     Counter readFuncExeInst() { return thread->funcExeInst; }
 282
 283     void changeRegFileContext(unsigned param,
 284                                       unsigned val)
 285     { panic("Not supported!"); }
 286 };
 287
 288 #endif