atomic.hh revision 8737
1/* 2 * Copyright (c) 2002-2005 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 * Authors: Steve Reinhardt 29 */ 30 31#ifndef __CPU_SIMPLE_ATOMIC_HH__ 32#define __CPU_SIMPLE_ATOMIC_HH__ 33 34#include "cpu/simple/base.hh" 35#include "params/AtomicSimpleCPU.hh" 36 37class AtomicSimpleCPU : public BaseSimpleCPU 38{ 39 public: 40 41 AtomicSimpleCPU(AtomicSimpleCPUParams *params); 42 virtual ~AtomicSimpleCPU(); 43 44 virtual void init(); 45 46 private: 47 48 struct TickEvent : public Event 49 { 50 AtomicSimpleCPU *cpu; 51 52 TickEvent(AtomicSimpleCPU *c); 53 void process(); 54 const char *description() const; 55 }; 56 57 TickEvent tickEvent; 58 59 const int width; 60 bool locked; 61 const bool simulate_data_stalls; 62 const bool simulate_inst_stalls; 63 64 // main simulation loop (one cycle) 65 void tick(); 66 67 /** 68 * An AtomicCPUPort overrides the default behaviour of the 69 * recvAtomic and ignores the packet instead of panicking. 70 */ 71 class AtomicCPUPort : public CpuPort 72 { 73 74 public: 75 76 AtomicCPUPort(const std::string &_name, BaseCPU* _cpu) 77 : CpuPort(_name, _cpu) 78 { } 79 80 protected: 81 82 virtual Tick recvAtomic(PacketPtr pkt) 83 { 84 // Snooping a coherence request, just return 85 return 0; 86 } 87 88 }; 89 90 AtomicCPUPort icachePort; 91 AtomicCPUPort dcachePort; 92 93 CpuPort physmemPort; 94 bool hasPhysMemPort; 95 Request ifetch_req; 96 Request data_read_req; 97 Request data_write_req; 98 99 bool dcache_access; 100 Tick dcache_latency; 101 102 Range<Addr> physMemAddr; 103 104 public: 105 106 virtual Port *getPort(const std::string &if_name, int idx = -1); 107 108 virtual void serialize(std::ostream &os); 109 virtual void unserialize(Checkpoint *cp, const std::string §ion); 110 virtual void resume(); 111 112 void switchOut(); 113 void takeOverFrom(BaseCPU *oldCPU); 114 115 virtual void activateContext(ThreadID thread_num, int delay); 116 virtual void suspendContext(ThreadID thread_num); 117 118 Fault readMem(Addr addr, uint8_t *data, unsigned size, unsigned flags); 119 120 Fault writeMem(uint8_t *data, unsigned size, 121 Addr addr, unsigned flags, uint64_t *res); 122 123 /** 124 * Print state of address in memory system via PrintReq (for 125 * debugging). 126 */ 127 void printAddr(Addr a); 128}; 129 130#endif // __CPU_SIMPLE_ATOMIC_HH__ 131