src/dev/alpha/backdoor.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: Nathan Binkert
  29  *          Ali Saidi
  30  *          Steve Reinhardt
  31  *          Erik Hallnor
  32  */
  33
  34 /** @file
  35  * Alpha Console Backdoor Definition
  36  */
  37
  38 #include <cstddef>
  39 #include <string>
  40
  41 #include "arch/alpha/system.hh"
  42 #include "base/inifile.hh"
  43 #include "base/str.hh"
  44 #include "base/trace.hh"
  45 #include "cpu/base.hh"
  46 #include "cpu/thread_context.hh"
  47 #include "debug/AlphaBackdoor.hh"
  48 #include "dev/alpha/backdoor.hh"
  49 #include "dev/platform.hh"
  50 #include "dev/simple_disk.hh"
  51 #include "dev/terminal.hh"
  52 #include "mem/packet.hh"
  53 #include "mem/packet_access.hh"
  54 #include "mem/physical.hh"
  55 #include "params/AlphaBackdoor.hh"
  56 #include "sim/sim_object.hh"
  57
  58 using namespace std;
  59 using namespace AlphaISA;
  60
  61 AlphaBackdoor::AlphaBackdoor(const Params *p)
  62     : BasicPioDevice(p), disk(p->disk), terminal(p->terminal),
  63       system(p->system), cpu(p->cpu)
  64 {
  65
  66     pioSize = sizeof(struct AlphaAccess);
  67
  68     alphaAccess = new Access();
  69     alphaAccess->last_offset = pioSize - 1;
  70
  71     alphaAccess->version = ALPHA_ACCESS_VERSION;
  72     alphaAccess->diskUnit = 1;
  73
  74     alphaAccess->diskCount = 0;
  75     alphaAccess->diskPAddr = 0;
  76     alphaAccess->diskBlock = 0;
  77     alphaAccess->diskOperation = 0;
  78     alphaAccess->outputChar = 0;
  79     alphaAccess->inputChar = 0;
  80     std::memset(alphaAccess->cpuStack, 0, sizeof(alphaAccess->cpuStack));
  81
  82 }
  83
  84 void
  85 AlphaBackdoor::startup()
  86 {
  87     system->setAlphaAccess(pioAddr);
  88     alphaAccess->numCPUs = system->numContexts();
  89     alphaAccess->kernStart = system->getKernelStart();
  90     alphaAccess->kernEnd = system->getKernelEnd();
  91     alphaAccess->entryPoint = system->getKernelEntry();
  92     alphaAccess->mem_size = system->physmem->size();
  93     alphaAccess->cpuClock = cpu->frequency() / 1000000; // In MHz
  94     alphaAccess->intrClockFrequency = params()->platform->intrFrequency();
  95 }
  96
  97 Tick
  98 AlphaBackdoor::read(PacketPtr pkt)
  99 {
 100
 101     /** XXX Do we want to push the addr munging to a bus brige or something? So
 102      * the device has it's physical address and then the bridge adds on whatever
 103      * machine dependent address swizzle is required?
 104      */
 105
 106     assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
 107
 108     Addr daddr = pkt->getAddr() - pioAddr;
 109
 110     pkt->allocate();
 111     pkt->makeAtomicResponse();
 112
 113     switch (pkt->getSize())
 114     {
 115         case sizeof(uint32_t):
 116             switch (daddr)
 117             {
 118                 case offsetof(AlphaAccess, last_offset):
 119                     pkt->set(alphaAccess->last_offset);
 120                     break;
 121                 case offsetof(AlphaAccess, version):
 122                     pkt->set(alphaAccess->version);
 123                     break;
 124                 case offsetof(AlphaAccess, numCPUs):
 125                     pkt->set(alphaAccess->numCPUs);
 126                     break;
 127                 case offsetof(AlphaAccess, intrClockFrequency):
 128                     pkt->set(alphaAccess->intrClockFrequency);
 129                     break;
 130                 default:
 131                     /* Old console code read in everyting as a 32bit int
 132                      * we now break that for better error checking.
 133                      */
 134                   pkt->setBadAddress();
 135             }
 136             DPRINTF(AlphaBackdoor, "read: offset=%#x val=%#x\n", daddr,
 137                     pkt->get<uint32_t>());
 138             break;
 139         case sizeof(uint64_t):
 140             switch (daddr)
 141             {
 142                 case offsetof(AlphaAccess, inputChar):
 143                     pkt->set(terminal->console_in());
 144                     break;
 145                 case offsetof(AlphaAccess, cpuClock):
 146                     pkt->set(alphaAccess->cpuClock);
 147                     break;
 148                 case offsetof(AlphaAccess, mem_size):
 149                     pkt->set(alphaAccess->mem_size);
 150                     break;
 151                 case offsetof(AlphaAccess, kernStart):
 152                     pkt->set(alphaAccess->kernStart);
 153                     break;
 154                 case offsetof(AlphaAccess, kernEnd):
 155                     pkt->set(alphaAccess->kernEnd);
 156                     break;
 157                 case offsetof(AlphaAccess, entryPoint):
 158                     pkt->set(alphaAccess->entryPoint);
 159                     break;
 160                 case offsetof(AlphaAccess, diskUnit):
 161                     pkt->set(alphaAccess->diskUnit);
 162                     break;
 163                 case offsetof(AlphaAccess, diskCount):
 164                     pkt->set(alphaAccess->diskCount);
 165                     break;
 166                 case offsetof(AlphaAccess, diskPAddr):
 167                     pkt->set(alphaAccess->diskPAddr);
 168                     break;
 169                 case offsetof(AlphaAccess, diskBlock):
 170                     pkt->set(alphaAccess->diskBlock);
 171                     break;
 172                 case offsetof(AlphaAccess, diskOperation):
 173                     pkt->set(alphaAccess->diskOperation);
 174                     break;
 175                 case offsetof(AlphaAccess, outputChar):
 176                     pkt->set(alphaAccess->outputChar);
 177                     break;
 178                 default:
 179                     int cpunum = (daddr - offsetof(AlphaAccess, cpuStack)) /
 180                                  sizeof(alphaAccess->cpuStack[0]);
 181
 182                     if (cpunum >= 0 && cpunum < 64)
 183                         pkt->set(alphaAccess->cpuStack[cpunum]);
 184                     else
 185                         panic("Unknown 64bit access, %#x\n", daddr);
 186             }
 187             DPRINTF(AlphaBackdoor, "read: offset=%#x val=%#x\n", daddr,
 188                     pkt->get<uint64_t>());
 189             break;
 190         default:
 191           pkt->setBadAddress();
 192     }
 193     return pioDelay;
 194 }
 195
 196 Tick
 197 AlphaBackdoor::write(PacketPtr pkt)
 198 {
 199     assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
 200     Addr daddr = pkt->getAddr() - pioAddr;
 201
 202     uint64_t val = pkt->get<uint64_t>();
 203     assert(pkt->getSize() == sizeof(uint64_t));
 204
 205     switch (daddr) {
 206       case offsetof(AlphaAccess, diskUnit):
 207         alphaAccess->diskUnit = val;
 208         break;
 209
 210       case offsetof(AlphaAccess, diskCount):
 211         alphaAccess->diskCount = val;
 212         break;
 213
 214       case offsetof(AlphaAccess, diskPAddr):
 215         alphaAccess->diskPAddr = val;
 216         break;
 217
 218       case offsetof(AlphaAccess, diskBlock):
 219         alphaAccess->diskBlock = val;
 220         break;
 221
 222       case offsetof(AlphaAccess, diskOperation):
 223         if (val == 0x13)
 224             disk->read(alphaAccess->diskPAddr, alphaAccess->diskBlock,
 225                        alphaAccess->diskCount);
 226         else
 227             panic("Invalid disk operation!");
 228
 229         break;
 230
 231       case offsetof(AlphaAccess, outputChar):
 232         terminal->out((char)(val & 0xff));
 233         break;
 234
 235       default:
 236         int cpunum = (daddr - offsetof(AlphaAccess, cpuStack)) /
 237                      sizeof(alphaAccess->cpuStack[0]);
 238         inform("Launching CPU %d @ %d", cpunum, curTick());
 239         assert(val > 0 && "Must not access primary cpu");
 240         if (cpunum >= 0 && cpunum < 64)
 241             alphaAccess->cpuStack[cpunum] = val;
 242         else
 243             panic("Unknown 64bit access, %#x\n", daddr);
 244     }
 245
 246     pkt->makeAtomicResponse();
 247
 248     return pioDelay;
 249 }
 250
 251 void
 252 AlphaBackdoor::Access::serialize(ostream &os)
 253 {
 254     SERIALIZE_SCALAR(last_offset);
 255     SERIALIZE_SCALAR(version);
 256     SERIALIZE_SCALAR(numCPUs);
 257     SERIALIZE_SCALAR(mem_size);
 258     SERIALIZE_SCALAR(cpuClock);
 259     SERIALIZE_SCALAR(intrClockFrequency);
 260     SERIALIZE_SCALAR(kernStart);
 261     SERIALIZE_SCALAR(kernEnd);
 262     SERIALIZE_SCALAR(entryPoint);
 263     SERIALIZE_SCALAR(diskUnit);
 264     SERIALIZE_SCALAR(diskCount);
 265     SERIALIZE_SCALAR(diskPAddr);
 266     SERIALIZE_SCALAR(diskBlock);
 267     SERIALIZE_SCALAR(diskOperation);
 268     SERIALIZE_SCALAR(outputChar);
 269     SERIALIZE_SCALAR(inputChar);
 270     SERIALIZE_ARRAY(cpuStack,64);
 271 }
 272
 273 void
 274 AlphaBackdoor::Access::unserialize(Checkpoint *cp, const std::string &section)
 275 {
 276     UNSERIALIZE_SCALAR(last_offset);
 277     UNSERIALIZE_SCALAR(version);
 278     UNSERIALIZE_SCALAR(numCPUs);
 279     UNSERIALIZE_SCALAR(mem_size);
 280     UNSERIALIZE_SCALAR(cpuClock);
 281     UNSERIALIZE_SCALAR(intrClockFrequency);
 282     UNSERIALIZE_SCALAR(kernStart);
 283     UNSERIALIZE_SCALAR(kernEnd);
 284     UNSERIALIZE_SCALAR(entryPoint);
 285     UNSERIALIZE_SCALAR(diskUnit);
 286     UNSERIALIZE_SCALAR(diskCount);
 287     UNSERIALIZE_SCALAR(diskPAddr);
 288     UNSERIALIZE_SCALAR(diskBlock);
 289     UNSERIALIZE_SCALAR(diskOperation);
 290     UNSERIALIZE_SCALAR(outputChar);
 291     UNSERIALIZE_SCALAR(inputChar);
 292     UNSERIALIZE_ARRAY(cpuStack, 64);
 293 }
 294
 295 void
 296 AlphaBackdoor::serialize(ostream &os)
 297 {
 298     alphaAccess->serialize(os);
 299 }
 300
 301 void
 302 AlphaBackdoor::unserialize(Checkpoint *cp, const std::string &section)
 303 {
 304     alphaAccess->unserialize(cp, section);
 305 }
 306
 307 AlphaBackdoor *
 308 AlphaBackdoorParams::create()
 309 {
 310     return new AlphaBackdoor(this);
 311 }