src/mem/se_translating_port_proxy.cc

   1 /*
   2  * Copyright (c) 2011 ARM Limited
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Copyright (c) 2001-2005 The Regents of The University of Michigan
  15  * All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions are
  19  * met: redistributions of source code must retain the above copyright
  20  * notice, this list of conditions and the following disclaimer;
  21  * redistributions in binary form must reproduce the above copyright
  22  * notice, this list of conditions and the following disclaimer in the
  23  * documentation and/or other materials provided with the distribution;
  24  * neither the name of the copyright holders nor the names of its
  25  * contributors may be used to endorse or promote products derived from
  26  * this software without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  30  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  31  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  32  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  33  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  34  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  35  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  36  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  37  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  38  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  39  *
  40  * Authors: Ron Dreslinski
  41  *          Steve Reinhardt
  42  *          Andreas Hansson
  43  */
  44
  45 #include <string>
  46
  47 #include "arch/isa_traits.hh"
  48 #include "base/chunk_generator.hh"
  49 #include "config/the_isa.hh"
  50 #include "mem/page_table.hh"
  51 #include "mem/se_translating_port_proxy.hh"
  52 #include "sim/process.hh"
  53
  54 using namespace TheISA;
  55
  56 SETranslatingPortProxy::SETranslatingPortProxy(MasterPort& port, Process *p,
  57                                            AllocType alloc)
  58     : PortProxy(port), pTable(p->pTable), process(p),
  59       allocating(alloc)
  60 { }
  61
  62 SETranslatingPortProxy::~SETranslatingPortProxy()
  63 { }
  64
  65 bool
  66 SETranslatingPortProxy::tryReadBlob(Addr addr, uint8_t *p, int size) const
  67 {
  68     int prevSize = 0;
  69
  70     for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
  71         Addr paddr;
  72
  73         if (!pTable->translate(gen.addr(),paddr))
  74             return false;
  75
  76         PortProxy::readBlob(paddr, p + prevSize, gen.size());
  77         prevSize += gen.size();
  78     }
  79
  80     return true;
  81 }
  82
  83 void
  84 SETranslatingPortProxy::readBlob(Addr addr, uint8_t *p, int size) const
  85 {
  86     if (!tryReadBlob(addr, p, size))
  87         fatal("readBlob(0x%x, ...) failed", addr);
  88 }
  89
  90
  91 bool
  92 SETranslatingPortProxy::tryWriteBlob(Addr addr, uint8_t *p, int size) const
  93 {
  94     int prevSize = 0;
  95
  96     for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
  97         Addr paddr;
  98
  99         if (!pTable->translate(gen.addr(), paddr)) {
 100             if (allocating == Always) {
 101                 process->allocateMem(roundDown(gen.addr(), VMPageSize),
 102                                      VMPageSize);
 103             } else if (allocating == NextPage) {
 104                 // check if we've accessed the next page on the stack
 105                 if (!process->fixupStackFault(gen.addr()))
 106                     panic("Page table fault when accessing virtual address %#x "
 107                             "during functional write\n", gen.addr());
 108             } else {
 109                 return false;
 110             }
 111             pTable->translate(gen.addr(), paddr);
 112         }
 113
 114         PortProxy::writeBlob(paddr, p + prevSize, gen.size());
 115         prevSize += gen.size();
 116     }
 117
 118     return true;
 119 }
 120
 121
 122 void
 123 SETranslatingPortProxy::writeBlob(Addr addr, uint8_t *p, int size) const
 124 {
 125     if (!tryWriteBlob(addr, p, size))
 126         fatal("writeBlob(0x%x, ...) failed", addr);
 127 }
 128
 129 bool
 130 SETranslatingPortProxy::tryMemsetBlob(Addr addr, uint8_t val, int size) const
 131 {
 132     for (ChunkGenerator gen(addr, size, VMPageSize); !gen.done(); gen.next()) {
 133         Addr paddr;
 134
 135         if (!pTable->translate(gen.addr(), paddr)) {
 136             if (allocating == Always) {
 137                 process->allocateMem(roundDown(gen.addr(), VMPageSize),
 138                                      VMPageSize);
 139                 pTable->translate(gen.addr(), paddr);
 140             } else {
 141                 return false;
 142             }
 143         }
 144
 145         PortProxy::memsetBlob(paddr, val, gen.size());
 146     }
 147
 148     return true;
 149 }
 150
 151 void
 152 SETranslatingPortProxy::memsetBlob(Addr addr, uint8_t val, int size) const
 153 {
 154     if (!tryMemsetBlob(addr, val, size))
 155         fatal("memsetBlob(0x%x, ...) failed", addr);
 156 }
 157
 158
 159 bool
 160 SETranslatingPortProxy::tryWriteString(Addr addr, const char *str) const
 161 {
 162     uint8_t c;
 163
 164     Addr vaddr = addr;
 165
 166     do {
 167         c = *str++;
 168         Addr paddr;
 169
 170         if (!pTable->translate(vaddr++, paddr))
 171             return false;
 172
 173         PortProxy::writeBlob(paddr, &c, 1);
 174     } while (c);
 175
 176     return true;
 177 }
 178
 179 void
 180 SETranslatingPortProxy::writeString(Addr addr, const char *str) const
 181 {
 182     if (!tryWriteString(addr, str))
 183         fatal("writeString(0x%x, ...) failed", addr);
 184 }
 185
 186 bool
 187 SETranslatingPortProxy::tryReadString(std::string &str, Addr addr) const
 188 {
 189     uint8_t c;
 190
 191     Addr vaddr = addr;
 192
 193     while (true) {
 194         Addr paddr;
 195
 196         if (!pTable->translate(vaddr++, paddr))
 197             return false;
 198
 199         PortProxy::readBlob(paddr, &c, 1);
 200         if (c == '\0')
 201             break;
 202
 203         str += c;
 204     }
 205
 206     return true;
 207 }
 208
 209 void
 210 SETranslatingPortProxy::readString(std::string &str, Addr addr) const
 211 {
 212     if (!tryReadString(str, addr))
 213         fatal("readString(0x%x, ...) failed", addr);
 214 }
 215