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