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
  34 #include "base/chunk_generator.hh"
  35 #include "config/the_isa.hh"
  36 #include "mem/port.hh"
  37 #include "mem/translating_port.hh"
  38 #include "mem/page_table.hh"
  39 #include "sim/process.hh"
  40
  41 using namespace TheISA;
  42
  43 TranslatingPort::TranslatingPort(const std::string &_name,
  44                                  Process *p, AllocType alloc)
  45     : FunctionalPort(_name), pTable(p->pTable), process(p),
  46       allocating(alloc)
  47 { }
  48
  49 TranslatingPort::~TranslatingPort()
  50 { }
  51
  52 bool
  53 TranslatingPort::tryReadBlob(Addr addr, uint8_t *p, int size)
  54 {
  55     Addr paddr;
  56     int prevSize = 0;
  57
  58     for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
  59
  60         if (!pTable->translate(gen.addr(),paddr))
  61             return false;
  62
  63         Port::readBlob(paddr, p + prevSize, gen.size());
  64         prevSize += gen.size();
  65     }
  66
  67     return true;
  68 }
  69
  70 void
  71 TranslatingPort::readBlob(Addr addr, uint8_t *p, int size)
  72 {
  73     if (!tryReadBlob(addr, p, size))
  74         fatal("readBlob(0x%x, ...) failed", addr);
  75 }
  76
  77
  78 bool
  79 TranslatingPort::tryWriteBlob(Addr addr, uint8_t *p, int size)
  80 {
  81
  82     Addr paddr;
  83     int prevSize = 0;
  84
  85     for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
  86
  87         if (!pTable->translate(gen.addr(), paddr)) {
  88             if (allocating == Always) {
  89                 pTable->allocate(roundDown(gen.addr(), VMPageSize),
  90                                  VMPageSize);
  91             } else if (allocating == NextPage) {
  92                 // check if we've accessed the next page on the stack
  93                 if (!process->checkAndAllocNextPage(gen.addr()))
  94                     panic("Page table fault when accessing virtual address %#x "
  95                             "during functional write\n", gen.addr());
  96             } else {
  97                 return false;
  98             }
  99             pTable->translate(gen.addr(), paddr);
 100         }
 101
 102         Port::writeBlob(paddr, p + prevSize, gen.size());
 103         prevSize += gen.size();
 104     }
 105
 106     return true;
 107 }
 108
 109
 110 void
 111 TranslatingPort::writeBlob(Addr addr, uint8_t *p, int size)
 112 {
 113     if (!tryWriteBlob(addr, p, size))
 114         fatal("writeBlob(0x%x, ...) failed", addr);
 115 }
 116
 117 bool
 118 TranslatingPort::tryMemsetBlob(Addr addr, uint8_t val, int size)
 119 {
 120     Addr paddr;
 121
 122     for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
 123
 124         if (!pTable->translate(gen.addr(), paddr)) {
 125             if (allocating == Always) {
 126                 pTable->allocate(roundDown(gen.addr(), VMPageSize),
 127                                  VMPageSize);
 128                 pTable->translate(gen.addr(), paddr);
 129             } else {
 130                 return false;
 131             }
 132         }
 133
 134         Port::memsetBlob(paddr, val, gen.size());
 135     }
 136
 137     return true;
 138 }
 139
 140 void
 141 TranslatingPort::memsetBlob(Addr addr, uint8_t val, int size)
 142 {
 143     if (!tryMemsetBlob(addr, val, size))
 144         fatal("memsetBlob(0x%x, ...) failed", addr);
 145 }
 146
 147
 148 bool
 149 TranslatingPort::tryWriteString(Addr addr, const char *str)
 150 {
 151     Addr paddr,vaddr;
 152     uint8_t c;
 153
 154     vaddr = addr;
 155
 156     do {
 157         c = *str++;
 158         if (!pTable->translate(vaddr++,paddr))
 159             return false;
 160
 161         Port::writeBlob(paddr, &c, 1);
 162     } while (c);
 163
 164     return true;
 165 }
 166
 167 void
 168 TranslatingPort::writeString(Addr addr, const char *str)
 169 {
 170     if (!tryWriteString(addr, str))
 171         fatal("writeString(0x%x, ...) failed", addr);
 172 }
 173
 174 bool
 175 TranslatingPort::tryReadString(std::string &str, Addr addr)
 176 {
 177     Addr paddr,vaddr;
 178     uint8_t c;
 179
 180     vaddr = addr;
 181
 182     do {
 183         if (!pTable->translate(vaddr++,paddr))
 184             return false;
 185
 186         Port::readBlob(paddr, &c, 1);
 187         str += c;
 188     } while (c);
 189
 190     return true;
 191 }
 192
 193 void
 194 TranslatingPort::readString(std::string &str, Addr addr)
 195 {
 196     if (!tryReadString(str, addr))
 197         fatal("readString(0x%x, ...) failed", addr);
 198 }
 199