cpu/exec_context.cc

   1 /*
   2  * Copyright (c) 2003 The Regents of The University of Michigan
   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
  29 #include <string>
  30
  31 #include "cpu/base_cpu.hh"
  32 #include "cpu/exec_context.hh"
  33
  34 #ifdef FULL_SYSTEM
  35 #include "sim/system.hh"
  36 #else
  37 #include "sim/process.hh"
  38 #endif
  39
  40 using namespace std;
  41
  42 // constructor
  43 #ifdef FULL_SYSTEM
  44 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, System *_sys,
  45                          AlphaItb *_itb, AlphaDtb *_dtb,
  46                          FunctionalMemory *_mem)
  47     : _status(ExecContext::Unallocated),
  48       kernelStats(this, _cpu), cpu(_cpu), thread_num(_thread_num),
  49       cpu_id(-1), mem(_mem), itb(_itb), dtb(_dtb), system(_sys),
  50       memCtrl(_sys->memCtrl), physmem(_sys->physmem),
  51 #ifdef FS_MEASURE
  52       swCtx(NULL),
  53 #endif
  54       func_exe_inst(0), storeCondFailures(0)
  55 {
  56     memset(&regs, 0, sizeof(RegFile));
  57 }
  58 #else
  59 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  60                          Process *_process, int _asid)
  61     : _status(ExecContext::Unallocated),
  62       cpu(_cpu), thread_num(_thread_num), cpu_id(-1),
  63       process(_process), mem(process->getMemory()), asid(_asid),
  64       func_exe_inst(0), storeCondFailures(0)
  65 {
  66 }
  67
  68 ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
  69                          FunctionalMemory *_mem, int _asid)
  70     : cpu(_cpu), thread_num(_thread_num), process(0), mem(_mem), asid(_asid),
  71       func_exe_inst(0), storeCondFailures(0)
  72 {
  73 }
  74 #endif
  75
  76
  77 void
  78 ExecContext::takeOverFrom(ExecContext *oldContext)
  79 {
  80     // some things should already be set up
  81     assert(mem == oldContext->mem);
  82 #ifdef FULL_SYSTEM
  83     assert(system == oldContext->system);
  84 #else
  85     assert(process == oldContext->process);
  86 #endif
  87
  88     // copy over functional state
  89     _status = oldContext->_status;
  90 #ifdef FULL_SYSTEM
  91     kernelStats = oldContext->kernelStats;
  92 #endif
  93     regs = oldContext->regs;
  94     cpu_id = oldContext->cpu_id;
  95     func_exe_inst = oldContext->func_exe_inst;
  96
  97     storeCondFailures = 0;
  98
  99     oldContext->_status = ExecContext::Unallocated;
 100 }
 101
 102
 103 void
 104 ExecContext::serialize(ostream &os)
 105 {
 106     SERIALIZE_ENUM(_status);
 107     regs.serialize(os);
 108     // thread_num and cpu_id are deterministic from the config
 109     SERIALIZE_SCALAR(func_exe_inst);
 110 }
 111
 112
 113 void
 114 ExecContext::unserialize(Checkpoint *cp, const std::string &section)
 115 {
 116     UNSERIALIZE_ENUM(_status);
 117     regs.unserialize(cp, section);
 118     // thread_num and cpu_id are deterministic from the config
 119     UNSERIALIZE_SCALAR(func_exe_inst);
 120 }
 121
 122
 123 void
 124 ExecContext::activate(int delay)
 125 {
 126     if (status() == Active)
 127         return;
 128
 129     _status = Active;
 130     cpu->activateContext(thread_num, delay);
 131 }
 132
 133 void
 134 ExecContext::suspend()
 135 {
 136     if (status() == Suspended)
 137         return;
 138
 139 #ifdef FULL_SYSTEM
 140     // Don't change the status from active if there are pending interrupts
 141     if (cpu->check_interrupts()) {
 142         assert(status() == Active);
 143         return;
 144     }
 145 #endif
 146
 147     _status = Suspended;
 148     cpu->suspendContext(thread_num);
 149 }
 150
 151 void
 152 ExecContext::deallocate()
 153 {
 154     if (status() == Unallocated)
 155         return;
 156
 157     _status = Unallocated;
 158     cpu->deallocateContext(thread_num);
 159 }
 160
 161 void
 162 ExecContext::halt()
 163 {
 164     if (status() == Halted)
 165         return;
 166
 167     _status = Halted;
 168     cpu->haltContext(thread_num);
 169 }
 170
 171
 172 void
 173 ExecContext::regStats(const string &name)
 174 {
 175 #ifdef FULL_SYSTEM
 176     kernelStats.regStats(name + ".kern");
 177 #endif
 178 }