1/* 2 * Copyright (c) 2001-2005 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: Ron Dreslinski 29 */ 30 31/* @file 32 */ 33 34#ifndef __PHYSICAL_MEMORY_HH__ 35#define __PHYSICAL_MEMORY_HH__ 36
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37#include <map> 38#include <string> 39 |
40#include "base/range.hh" 41#include "mem/mem_object.hh" 42#include "mem/packet.hh" 43#include "mem/tport.hh"
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44#include "params/PhysicalMemory.hh" |
45#include "sim/eventq.hh"
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42#include <map>
43#include <string>
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46 47// 48// Functional model for a contiguous block of physical memory. (i.e. RAM) 49// 50class PhysicalMemory : public MemObject 51{ 52 class MemoryPort : public SimpleTimingPort 53 { 54 PhysicalMemory *memory; 55 56 public: 57 58 MemoryPort(const std::string &_name, PhysicalMemory *_memory); 59 60 protected: 61 62 virtual Tick recvAtomic(PacketPtr pkt); 63 64 virtual void recvFunctional(PacketPtr pkt); 65 66 virtual void recvStatusChange(Status status); 67 68 virtual void getDeviceAddressRanges(AddrRangeList &resp, 69 bool &snoop); 70 71 virtual int deviceBlockSize(); 72 }; 73 74 int numPorts; 75 76 77 private: 78 // prevent copying of a MainMemory object 79 PhysicalMemory(const PhysicalMemory &specmem); 80 const PhysicalMemory &operator=(const PhysicalMemory &specmem); 81 82 protected: 83 84 class LockedAddr { 85 public: 86 // on alpha, minimum LL/SC granularity is 16 bytes, so lower 87 // bits need to masked off. 88 static const Addr Addr_Mask = 0xf; 89 90 static Addr mask(Addr paddr) { return (paddr & ~Addr_Mask); } 91 92 Addr addr; // locked address 93 int cpuNum; // locking CPU 94 int threadNum; // locking thread ID within CPU 95 96 // check for matching execution context 97 bool matchesContext(Request *req) 98 { 99 return (cpuNum == req->getCpuNum() && 100 threadNum == req->getThreadNum()); 101 } 102 103 LockedAddr(Request *req) 104 : addr(mask(req->getPaddr())), 105 cpuNum(req->getCpuNum()), 106 threadNum(req->getThreadNum()) 107 { 108 } 109 }; 110 111 std::list<LockedAddr> lockedAddrList; 112 113 // helper function for checkLockedAddrs(): we really want to 114 // inline a quick check for an empty locked addr list (hopefully 115 // the common case), and do the full list search (if necessary) in 116 // this out-of-line function
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115 bool checkLockedAddrList(PacketPtr pkt);
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117 bool checkLockedAddrList(Request *req); |
118 119 // Record the address of a load-locked operation so that we can 120 // clear the execution context's lock flag if a matching store is 121 // performed
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120 void trackLoadLocked(PacketPtr pkt);
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122 void trackLoadLocked(Request *req); |
123 124 // Compare a store address with any locked addresses so we can 125 // clear the lock flag appropriately. Return value set to 'false' 126 // if store operation should be suppressed (because it was a 127 // conditional store and the address was no longer locked by the 128 // requesting execution context), 'true' otherwise. Note that 129 // this method must be called on *all* stores since even 130 // non-conditional stores must clear any matching lock addresses.
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129 bool writeOK(PacketPtr pkt) {
130 Request *req = pkt->req;
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131 bool writeOK(Request *req) { |
132 if (lockedAddrList.empty()) { 133 // no locked addrs: nothing to check, store_conditional fails
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133 bool isLocked = pkt->isLocked();
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134 bool isLocked = req->isLocked(); |
135 if (isLocked) { 136 req->setExtraData(0); 137 } 138 return !isLocked; // only do write if not an sc 139 } else { 140 // iterate over list...
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140 return checkLockedAddrList(pkt);
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141 return checkLockedAddrList(req); |
142 } 143 } 144 145 uint8_t *pmemAddr; 146 int pagePtr; 147 Tick lat; 148 std::vector<MemoryPort*> ports; 149 typedef std::vector<MemoryPort*>::iterator PortIterator; 150 151 public: 152 Addr new_page();
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152 uint64_t size() { return params()->addrRange.size(); }
153 uint64_t start() { return params()->addrRange.start; }
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153 uint64_t size() { return params()->range.size(); } 154 uint64_t start() { return params()->range.start; } |
155
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155 struct Params
156 {
157 std::string name;
158 Range<Addr> addrRange;
159 Tick latency;
160 bool zero;
161 };
162
163 protected:
164 Params *_params;
165
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156 public:
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167 const Params *params() const { return _params; }
168 PhysicalMemory(Params *p);
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157 typedef PhysicalMemoryParams Params; 158 PhysicalMemory(const Params *p); |
159 virtual ~PhysicalMemory(); 160
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161 const Params * 162 params() const 163 { 164 return dynamic_cast<const Params *>(_params); 165 } 166 |
167 public: 168 int deviceBlockSize(); 169 void getAddressRanges(AddrRangeList &resp, bool &snoop); 170 virtual Port *getPort(const std::string &if_name, int idx = -1); 171 void virtual init(); 172 unsigned int drain(Event *de); 173 174 protected:
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179 Tick doAtomicAccess(PacketPtr pkt);
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175 void doFunctionalAccess(PacketPtr pkt); 176 virtual Tick calculateLatency(PacketPtr pkt); 177 void recvStatusChange(Port::Status status); 178 179 public: 180 virtual void serialize(std::ostream &os); 181 virtual void unserialize(Checkpoint *cp, const std::string §ion); 182 183}; 184 185#endif //__PHYSICAL_MEMORY_HH__
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