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 #include "sim/system.hh"
  54
  55 using namespace TheISA;
  56
  57 SETranslatingPortProxy::SETranslatingPortProxy(MasterPort& port, Process *p,
  58                                            AllocType alloc)
  59     : PortProxy(port, p->system->cacheLineSize()), pTable(p->pTable),
  60       process(p), allocating(alloc)
  61 { }
  62
  63 SETranslatingPortProxy::~SETranslatingPortProxy()
  64 { }
  65
  66 bool
  67 SETranslatingPortProxy::tryReadBlob(Addr addr, uint8_t *p, int size) const
  68 {
  69     int prevSize = 0;
  70
  71     for (ChunkGenerator gen(addr, size, PageBytes); !gen.done(); gen.next()) {
  72         Addr paddr;
  73
  74         if (!pTable->translate(gen.addr(),paddr))
  75             return false;
  76
  77         PortProxy::readBlob(paddr, p + prevSize, gen.size());
  78         prevSize += gen.size();
  79     }
  80
  81     return true;
  82 }
  83
  84 void
  85 SETranslatingPortProxy::readBlob(Addr addr, uint8_t *p, int size) const
  86 {
  87     if (!tryReadBlob(addr, p, size))
  88         fatal("readBlob(0x%x, ...) failed", addr);
  89 }
  90
  91
  92 bool
  93 SETranslatingPortProxy::tryWriteBlob(Addr addr, const uint8_t *p,
  94                                      int size) const
  95 {
  96     int prevSize = 0;
  97
  98     for (ChunkGenerator gen(addr, size, PageBytes); !gen.done(); gen.next()) {
  99         Addr paddr;
 100
 101         if (!pTable->translate(gen.addr(), paddr)) {
 102             if (allocating == Always) {
 103                 process->allocateMem(roundDown(gen.addr(), PageBytes),
 104                                      PageBytes);
 105             } else if (allocating == NextPage) {
 106                 // check if we've accessed the next page on the stack
 107                 if (!process->fixupStackFault(gen.addr()))
 108                     panic("Page table fault when accessing virtual address %#x "
 109                             "during functional write\n", gen.addr());
 110             } else {
 111                 return false;
 112             }
 113             pTable->translate(gen.addr(), paddr);
 114         }
 115
 116         PortProxy::writeBlob(paddr, p + prevSize, gen.size());
 117         prevSize += gen.size();
 118     }
 119
 120     return true;
 121 }
 122
 123
 124 void
 125 SETranslatingPortProxy::writeBlob(Addr addr, const uint8_t *p, int size) const
 126 {
 127     if (!tryWriteBlob(addr, p, size))
 128         fatal("writeBlob(0x%x, ...) failed", addr);
 129 }
 130
 131 bool
 132 SETranslatingPortProxy::tryMemsetBlob(Addr addr, uint8_t val, int size) const
 133 {
 134     for (ChunkGenerator gen(addr, size, PageBytes); !gen.done(); gen.next()) {
 135         Addr paddr;
 136
 137         if (!pTable->translate(gen.addr(), paddr)) {
 138             if (allocating == Always) {
 139                 process->allocateMem(roundDown(gen.addr(), PageBytes),
 140                                      PageBytes);
 141                 pTable->translate(gen.addr(), paddr);
 142             } else {
 143                 return false;
 144             }
 145         }
 146
 147         PortProxy::memsetBlob(paddr, val, gen.size());
 148     }
 149
 150     return true;
 151 }
 152
 153 void
 154 SETranslatingPortProxy::memsetBlob(Addr addr, uint8_t val, int size) const
 155 {
 156     if (!tryMemsetBlob(addr, val, size))
 157         fatal("memsetBlob(0x%x, ...) failed", addr);
 158 }
 159
 160
 161 bool
 162 SETranslatingPortProxy::tryWriteString(Addr addr, const char *str) const
 163 {
 164     uint8_t c;
 165
 166     Addr vaddr = addr;
 167
 168     do {
 169         c = *str++;
 170         Addr paddr;
 171
 172         if (!pTable->translate(vaddr++, paddr))
 173             return false;
 174
 175         PortProxy::writeBlob(paddr, &c, 1);
 176     } while (c);
 177
 178     return true;
 179 }
 180
 181 void
 182 SETranslatingPortProxy::writeString(Addr addr, const char *str) const
 183 {
 184     if (!tryWriteString(addr, str))
 185         fatal("writeString(0x%x, ...) failed", addr);
 186 }
 187
 188 bool
 189 SETranslatingPortProxy::tryReadString(std::string &str, Addr addr) const
 190 {
 191     uint8_t c;
 192
 193     Addr vaddr = addr;
 194
 195     while (true) {
 196         Addr paddr;
 197
 198         if (!pTable->translate(vaddr++, paddr))
 199             return false;
 200
 201         PortProxy::readBlob(paddr, &c, 1);
 202         if (c == '\0')
 203             break;
 204
 205         str += c;
 206     }
 207
 208     return true;
 209 }
 210
 211 void
 212 SETranslatingPortProxy::readString(std::string &str, Addr addr) const
 213 {
 214     if (!tryReadString(str, addr))
 215         fatal("readString(0x%x, ...) failed", addr);
 216 }
 217