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