atomic.hh revision 2665
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 36class AtomicSimpleCPU : public BaseSimpleCPU 37{ 38 public: 39 40 struct Params : public BaseSimpleCPU::Params { 41 int width; 42 bool simulate_stalls; 43 }; 44 45 AtomicSimpleCPU(Params *params); 46 virtual ~AtomicSimpleCPU(); 47 48 virtual void init(); 49 50 public: 51 // 52 enum Status { 53 Running, 54 Idle, 55 SwitchedOut 56 }; 57 58 protected: 59 Status _status; 60 61 Status status() const { return _status; } 62 63 private: 64 65 struct TickEvent : public Event 66 { 67 AtomicSimpleCPU *cpu; 68 69 TickEvent(AtomicSimpleCPU *c); 70 void process(); 71 const char *description(); 72 }; 73 74 TickEvent tickEvent; 75 76 const int width; 77 const bool simulate_stalls; 78 79 // main simulation loop (one cycle) 80 void tick(); 81 82 class CpuPort : public Port 83 { 84 85 AtomicSimpleCPU *cpu; 86 87 public: 88 89 CpuPort(const std::string &_name, AtomicSimpleCPU *_cpu) 90 : Port(_name), cpu(_cpu) 91 { } 92 93 protected: 94 95 virtual bool recvTiming(Packet *pkt); 96 97 virtual Tick recvAtomic(Packet *pkt); 98 99 virtual void recvFunctional(Packet *pkt); 100 101 virtual void recvStatusChange(Status status); 102 103 virtual void recvRetry(); 104 105 virtual void getDeviceAddressRanges(AddrRangeList &resp, 106 AddrRangeList &snoop) 107 { resp.clear(); snoop.clear(); } 108 }; 109 110 CpuPort icachePort; 111 CpuPort dcachePort; 112 113 Request *ifetch_req; 114 Packet *ifetch_pkt; 115 Request *data_read_req; 116 Packet *data_read_pkt; 117 Request *data_write_req; 118 Packet *data_write_pkt; 119 120 bool dcache_access; 121 Tick dcache_latency; 122 123 public: 124 125 virtual void serialize(std::ostream &os); 126 virtual void unserialize(Checkpoint *cp, const std::string §ion); 127 128 void switchOut(Sampler *s); 129 void takeOverFrom(BaseCPU *oldCPU); 130 131 virtual void activateContext(int thread_num, int delay); 132 virtual void suspendContext(int thread_num); 133 134 template <class T> 135 Fault read(Addr addr, T &data, unsigned flags); 136 137 template <class T> 138 Fault write(T data, Addr addr, unsigned flags, uint64_t *res); 139}; 140 141#endif // __CPU_SIMPLE_ATOMIC_HH__ 142