src/mem/translating_port.cc

   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  *          Steve Reinhardt
  30  */
  31
  32 #include <string>
  33 #include "base/chunk_generator.hh"
  34 #include "mem/port.hh"
  35 #include "mem/translating_port.hh"
  36 #include "mem/page_table.hh"
  37 #include "sim/process.hh"
  38
  39 using namespace TheISA;
  40
  41 TranslatingPort::TranslatingPort(const std::string &_name,
  42                                  Process *p, AllocType alloc)
  43     : FunctionalPort(_name), pTable(p->pTable), process(p),
  44       allocating(alloc)
  45 { }
  46
  47 TranslatingPort::~TranslatingPort()
  48 { }
  49
  50 bool
  51 TranslatingPort::tryReadBlob(Addr addr, uint8_t *p, int size)
  52 {
  53     Addr paddr;
  54     int prevSize = 0;
  55
  56     for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
  57
  58         if (!pTable->translate(gen.addr(),paddr))
  59             return false;
  60
  61         Port::readBlob(paddr, p + prevSize, gen.size());
  62         prevSize += gen.size();
  63     }
  64
  65     return true;
  66 }
  67
  68 void
  69 TranslatingPort::readBlob(Addr addr, uint8_t *p, int size)
  70 {
  71     if (!tryReadBlob(addr, p, size))
  72         fatal("readBlob(0x%x, ...) failed", addr);
  73 }
  74
  75
  76 bool
  77 TranslatingPort::tryWriteBlob(Addr addr, uint8_t *p, int size)
  78 {
  79
  80     Addr paddr;
  81     int prevSize = 0;
  82
  83     for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
  84
  85         if (!pTable->translate(gen.addr(), paddr)) {
  86             if (allocating == Always) {
  87                 pTable->allocate(roundDown(gen.addr(), VMPageSize),
  88                                  VMPageSize);
  89             } else if (allocating == NextPage) {
  90                 // check if we've accessed the next page on the stack
  91                 if (!process->checkAndAllocNextPage(gen.addr()))
  92                     panic("Page table fault when accessing virtual address %#x "
  93                             "during functional write\n", gen.addr());
  94             } else {
  95                 return false;
  96             }
  97             pTable->translate(gen.addr(), paddr);
  98         }
  99
 100         Port::writeBlob(paddr, p + prevSize, gen.size());
 101         prevSize += gen.size();
 102     }
 103
 104     return true;
 105 }
 106
 107
 108 void
 109 TranslatingPort::writeBlob(Addr addr, uint8_t *p, int size)
 110 {
 111     if (!tryWriteBlob(addr, p, size))
 112         fatal("writeBlob(0x%x, ...) failed", addr);
 113 }
 114
 115 bool
 116 TranslatingPort::tryMemsetBlob(Addr addr, uint8_t val, int size)
 117 {
 118     Addr paddr;
 119
 120     for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
 121
 122         if (!pTable->translate(gen.addr(), paddr)) {
 123             if (allocating == Always) {
 124                 pTable->allocate(roundDown(gen.addr(), VMPageSize),
 125                                  VMPageSize);
 126                 pTable->translate(gen.addr(), paddr);
 127             } else {
 128                 return false;
 129             }
 130         }
 131
 132         Port::memsetBlob(paddr, val, gen.size());
 133     }
 134
 135     return true;
 136 }
 137
 138 void
 139 TranslatingPort::memsetBlob(Addr addr, uint8_t val, int size)
 140 {
 141     if (!tryMemsetBlob(addr, val, size))
 142         fatal("memsetBlob(0x%x, ...) failed", addr);
 143 }
 144
 145
 146 bool
 147 TranslatingPort::tryWriteString(Addr addr, const char *str)
 148 {
 149     Addr paddr,vaddr;
 150     uint8_t c;
 151
 152     vaddr = addr;
 153
 154     do {
 155         c = *str++;
 156         if (!pTable->translate(vaddr++,paddr))
 157             return false;
 158
 159         Port::writeBlob(paddr, &c, 1);
 160     } while (c);
 161
 162     return true;
 163 }
 164
 165 void
 166 TranslatingPort::writeString(Addr addr, const char *str)
 167 {
 168     if (!tryWriteString(addr, str))
 169         fatal("writeString(0x%x, ...) failed", addr);
 170 }
 171
 172 bool
 173 TranslatingPort::tryReadString(std::string &str, Addr addr)
 174 {
 175     Addr paddr,vaddr;
 176     uint8_t c;
 177
 178     vaddr = addr;
 179
 180     do {
 181         if (!pTable->translate(vaddr++,paddr))
 182             return false;
 183
 184         Port::readBlob(paddr, &c, 1);
 185         str += c;
 186     } while (c);
 187
 188     return true;
 189 }
 190
 191 void
 192 TranslatingPort::readString(std::string &str, Addr addr)
 193 {
 194     if (!tryReadString(str, addr))
 195         fatal("readString(0x%x, ...) failed", addr);
 196 }
 197