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