1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
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| 3 * Copyright (c) 2011 Regents of the University of California |
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer;
10 * redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution;
13 * neither the name of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Authors: Steve Reinhardt
30 * Nathan Binkert
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| 31 * Rick Strong |
32 */
33
34#ifndef __CPU_BASE_HH__
35#define __CPU_BASE_HH__
36
37#include <vector>
38
39#include "arch/isa_traits.hh"
40#include "arch/microcode_rom.hh"
41#include "base/statistics.hh"
42#include "config/full_system.hh"
43#include "config/the_isa.hh"
44#include "sim/eventq.hh"
45#include "sim/insttracer.hh"
46#include "mem/mem_object.hh"
47
48#if FULL_SYSTEM
49#include "arch/interrupts.hh"
50#endif
51
52class BaseCPUParams;
53class BranchPred;
54class CheckerCPU;
55class ThreadContext;
56class System;
57class Port;
58
59namespace TheISA
60{
61 class Predecoder;
62}
63
64class CPUProgressEvent : public Event
65{
66 protected:
67 Tick _interval;
68 Counter lastNumInst;
69 BaseCPU *cpu;
70 bool _repeatEvent;
71
72 public:
73 CPUProgressEvent(BaseCPU *_cpu, Tick ival = 0);
74
75 void process();
76
77 void interval(Tick ival) { _interval = ival; }
78 Tick interval() { return _interval; }
79
80 void repeatEvent(bool repeat) { _repeatEvent = repeat; }
81
82 virtual const char *description() const;
83};
84
85class BaseCPU : public MemObject
86{
87 protected:
88 // CPU's clock period in terms of the number of ticks of curTime.
89 Tick clock;
90 // @todo remove me after debugging with legion done
91 Tick instCnt;
92 // every cpu has an id, put it in the base cpu
93 // Set at initialization, only time a cpuId might change is during a
94 // takeover (which should be done from within the BaseCPU anyway,
95 // therefore no setCpuId() method is provided
96 int _cpuId;
97
98 public:
99 /** Reads this CPU's ID. */
100 int cpuId() { return _cpuId; }
101
102// Tick currentTick;
103 inline Tick frequency() const { return SimClock::Frequency / clock; }
104 inline Tick ticks(int numCycles) const { return clock * numCycles; }
105 inline Tick curCycle() const { return curTick() / clock; }
106 inline Tick tickToCycles(Tick val) const { return val / clock; }
107 // @todo remove me after debugging with legion done
108 Tick instCount() { return instCnt; }
109
110 /** The next cycle the CPU should be scheduled, given a cache
111 * access or quiesce event returning on this cycle. This function
112 * may return curTick() if the CPU should run on the current cycle.
113 */
114 Tick nextCycle();
115
116 /** The next cycle the CPU should be scheduled, given a cache
117 * access or quiesce event returning on the given Tick. This
118 * function may return curTick() if the CPU should run on the
119 * current cycle.
120 * @param begin_tick The tick that the event is completing on.
121 */
122 Tick nextCycle(Tick begin_tick);
123
124 TheISA::MicrocodeRom microcodeRom;
125
126#if FULL_SYSTEM
127 protected:
128 TheISA::Interrupts *interrupts;
129
130 public:
131 TheISA::Interrupts *
132 getInterruptController()
133 {
134 return interrupts;
135 }
136
137 virtual void wakeup() = 0;
138
139 void
140 postInterrupt(int int_num, int index)
141 {
142 interrupts->post(int_num, index);
143 wakeup();
144 }
145
146 void
147 clearInterrupt(int int_num, int index)
148 {
149 interrupts->clear(int_num, index);
150 }
151
152 void
153 clearInterrupts()
154 {
155 interrupts->clearAll();
156 }
157
158 bool
159 checkInterrupts(ThreadContext *tc) const
160 {
161 return interrupts->checkInterrupts(tc);
162 }
163
164 class ProfileEvent : public Event
165 {
166 private:
167 BaseCPU *cpu;
168 Tick interval;
169
170 public:
171 ProfileEvent(BaseCPU *cpu, Tick interval);
172 void process();
173 };
174 ProfileEvent *profileEvent;
175#endif
176
177 protected:
178 std::vector<ThreadContext *> threadContexts;
179 std::vector<TheISA::Predecoder *> predecoders;
180
181 Trace::InstTracer * tracer;
182
183 public:
184
185 // Mask to align PCs to MachInst sized boundaries
186 static const Addr PCMask = ~((Addr)sizeof(TheISA::MachInst) - 1);
187
188 /// Provide access to the tracer pointer
189 Trace::InstTracer * getTracer() { return tracer; }
190
191 /// Notify the CPU that the indicated context is now active. The
192 /// delay parameter indicates the number of ticks to wait before
193 /// executing (typically 0 or 1).
194 virtual void activateContext(int thread_num, int delay) {}
195
196 /// Notify the CPU that the indicated context is now suspended.
197 virtual void suspendContext(int thread_num) {}
198
199 /// Notify the CPU that the indicated context is now deallocated.
200 virtual void deallocateContext(int thread_num) {}
201
202 /// Notify the CPU that the indicated context is now halted.
203 virtual void haltContext(int thread_num) {}
204
205 /// Given a Thread Context pointer return the thread num
206 int findContext(ThreadContext *tc);
207
208 /// Given a thread num get tho thread context for it
209 ThreadContext *getContext(int tn) { return threadContexts[tn]; }
210
211 public:
212 typedef BaseCPUParams Params;
213 const Params *params() const
214 { return reinterpret_cast<const Params *>(_params); }
215 BaseCPU(Params *params);
216 virtual ~BaseCPU();
217
218 virtual void init();
219 virtual void startup();
220 virtual void regStats();
221
222 virtual void activateWhenReady(ThreadID tid) {};
223
224 void registerThreadContexts();
225
226 /// Prepare for another CPU to take over execution. When it is
227 /// is ready (drained pipe) it signals the sampler.
228 virtual void switchOut();
229
230 /// Take over execution from the given CPU. Used for warm-up and
231 /// sampling.
232 virtual void takeOverFrom(BaseCPU *, Port *ic, Port *dc);
233
234 /**
235 * Number of threads we're actually simulating (<= SMT_MAX_THREADS).
236 * This is a constant for the duration of the simulation.
237 */
238 ThreadID numThreads;
239
240 TheISA::CoreSpecific coreParams; //ISA-Specific Params That Set Up State in Core
241
242 /**
243 * Vector of per-thread instruction-based event queues. Used for
244 * scheduling events based on number of instructions committed by
245 * a particular thread.
246 */
247 EventQueue **comInstEventQueue;
248
249 /**
250 * Vector of per-thread load-based event queues. Used for
251 * scheduling events based on number of loads committed by
252 *a particular thread.
253 */
254 EventQueue **comLoadEventQueue;
255
256 System *system;
257
258 Tick phase;
259
260#if FULL_SYSTEM
261 /**
262 * Serialize this object to the given output stream.
263 * @param os The stream to serialize to.
264 */
265 virtual void serialize(std::ostream &os);
266
267 /**
268 * Reconstruct the state of this object from a checkpoint.
269 * @param cp The checkpoint use.
270 * @param section The section name of this object
271 */
272 virtual void unserialize(Checkpoint *cp, const std::string §ion);
273
274#endif
275
276 /**
277 * Return pointer to CPU's branch predictor (NULL if none).
278 * @return Branch predictor pointer.
279 */
280 virtual BranchPred *getBranchPred() { return NULL; };
281
282 virtual Counter totalInstructions() const = 0;
283
284 // Function tracing
285 private:
286 bool functionTracingEnabled;
287 std::ostream *functionTraceStream;
288 Addr currentFunctionStart;
289 Addr currentFunctionEnd;
290 Tick functionEntryTick;
291 void enableFunctionTrace();
292 void traceFunctionsInternal(Addr pc);
293
294 protected:
295 void traceFunctions(Addr pc)
296 {
297 if (functionTracingEnabled)
298 traceFunctionsInternal(pc);
299 }
300
301 private:
302 static std::vector<BaseCPU *> cpuList; //!< Static global cpu list
303
304 public:
305 static int numSimulatedCPUs() { return cpuList.size(); }
306 static Counter numSimulatedInstructions()
307 {
308 Counter total = 0;
309
310 int size = cpuList.size();
311 for (int i = 0; i < size; ++i)
312 total += cpuList[i]->totalInstructions();
313
314 return total;
315 }
316
317 public:
318 // Number of CPU cycles simulated
319 Stats::Scalar numCycles;
320};
321
322#endif // __CPU_BASE_HH__
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