tsunami_cchip.cc

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· CC 代码 · 共 529 行 · 第 1/2 页

/*
 * Copyright (c) 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Ali G. Saidi
 *          Ronald G. Dreslinski Jr
 */

/** @file
 * Emulation of the Tsunami CChip CSRs
 */

#include <deque>
#include <string>
#include <vector>

#include "arch/alpha/ev5.hh"
#include "base/trace.hh"
#include "cpu/intr_control.hh"
#include "cpu/thread_context.hh"
#include "dev/alpha/tsunami.hh"
#include "dev/alpha/tsunami_cchip.hh"
#include "dev/alpha/tsunamireg.h"
#include "mem/packet.hh"
#include "mem/packet_access.hh"
#include "mem/port.hh"
#include "params/TsunamiCChip.hh"
#include "sim/system.hh"

using namespace std;
//Should this be AlphaISA?
using namespace TheISA;

TsunamiCChip::TsunamiCChip(const Params *p)
    : BasicPioDevice(p), tsunami(p->tsunami)
{
    pioSize = 0x10000000;

    drir = 0;
    ipint = 0;
    itint = 0;

    for (int x = 0; x < Tsunami::Max_CPUs; x++)
    {
        dim[x] = 0;
        dir[x] = 0;
    }

    //Put back pointer in tsunami
    tsunami->cchip = this;
}

Tick
TsunamiCChip::read(PacketPtr pkt)
{
    DPRINTF(Tsunami, "read  va=%#x size=%d\n", pkt->getAddr(), pkt->getSize());

    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);

    Addr regnum = (pkt->getAddr() - pioAddr) >> 6;
    Addr daddr = (pkt->getAddr() - pioAddr);

    pkt->allocate();
    switch (pkt->getSize()) {

      case sizeof(uint64_t):
          pkt->set<uint64_t>(0);

          if (daddr & TSDEV_CC_BDIMS)
          {
              pkt->set(dim[(daddr >> 4) & 0x3F]);
              break;
          }

          if (daddr & TSDEV_CC_BDIRS)
          {
              pkt->set(dir[(daddr >> 4) & 0x3F]);
              break;
          }

          switch(regnum) {
              case TSDEV_CC_CSR:
                  pkt->set(0x0);
                  break;
              case TSDEV_CC_MTR:
                  panic("TSDEV_CC_MTR not implemeted\n");
                   break;
              case TSDEV_CC_MISC:
                  pkt->set((ipint << 8) & 0xF | (itint << 4) & 0xF |
                                     (pkt->req->getCpuNum() & 0x3));
                  break;
              case TSDEV_CC_AAR0:
              case TSDEV_CC_AAR1:
              case TSDEV_CC_AAR2:
              case TSDEV_CC_AAR3:
                  pkt->set(0);
                  break;
              case TSDEV_CC_DIM0:
                  pkt->set(dim[0]);
                  break;
              case TSDEV_CC_DIM1:
                  pkt->set(dim[1]);
                  break;
              case TSDEV_CC_DIM2:
                  pkt->set(dim[2]);
                  break;
              case TSDEV_CC_DIM3:
                  pkt->set(dim[3]);
                  break;
              case TSDEV_CC_DIR0:
                  pkt->set(dir[0]);
                  break;
              case TSDEV_CC_DIR1:
                  pkt->set(dir[1]);
                  break;
              case TSDEV_CC_DIR2:
                  pkt->set(dir[2]);
                  break;
              case TSDEV_CC_DIR3:
                  pkt->set(dir[3]);
                  break;
              case TSDEV_CC_DRIR:
                  pkt->set(drir);
                  break;
              case TSDEV_CC_PRBEN:
                  panic("TSDEV_CC_PRBEN not implemented\n");
                  break;
              case TSDEV_CC_IIC0:
              case TSDEV_CC_IIC1:
              case TSDEV_CC_IIC2:
              case TSDEV_CC_IIC3:
                  panic("TSDEV_CC_IICx not implemented\n");
                  break;
              case TSDEV_CC_MPR0:
              case TSDEV_CC_MPR1:
              case TSDEV_CC_MPR2:
              case TSDEV_CC_MPR3:
                  panic("TSDEV_CC_MPRx not implemented\n");
                  break;
              case TSDEV_CC_IPIR:
                  pkt->set(ipint);
                  break;
              case TSDEV_CC_ITIR:
                  pkt->set(itint);
                  break;
              default:
                  panic("default in cchip read reached, accessing 0x%x\n");
           } // uint64_t

      break;
      case sizeof(uint32_t):
      case sizeof(uint16_t):
      case sizeof(uint8_t):
      default:
        panic("invalid access size(?) for tsunami register!\n");
    }
    DPRINTF(Tsunami, "Tsunami CChip: read  regnum=%#x size=%d data=%lld\n",
            regnum, pkt->getSize(), pkt->get<uint64_t>());

    pkt->makeAtomicResponse();
    return pioDelay;
}

Tick
TsunamiCChip::write(PacketPtr pkt)
{
    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
    Addr daddr = pkt->getAddr() - pioAddr;
    Addr regnum = (pkt->getAddr() - pioAddr) >> 6 ;


    assert(pkt->getSize() == sizeof(uint64_t));

    DPRINTF(Tsunami, "write - addr=%#x value=%#x\n", pkt->getAddr(), pkt->get<uint64_t>());

    bool supportedWrite = false;


    if (daddr & TSDEV_CC_BDIMS)
    {
        int number = (daddr >> 4) & 0x3F;

        uint64_t bitvector;
        uint64_t olddim;
        uint64_t olddir;

        olddim = dim[number];
        olddir = dir[number];
        dim[number] = pkt->get<uint64_t>();
        dir[number] = dim[number] & drir;
        for(int x = 0; x < Tsunami::Max_CPUs; x++)
        {
            bitvector = ULL(1) << x;
            // Figure out which bits have changed
            if ((dim[number] & bitvector) != (olddim & bitvector))
            {
                // The bit is now set and it wasn't before (set)
                if((dim[number] & bitvector) && (dir[number] & bitvector))
                {
                    tsunami->intrctrl->post(number, TheISA::INTLEVEL_IRQ1, x);
                    DPRINTF(Tsunami, "dim write resulting in posting dir"
                            " interrupt to cpu %d\n", number);
                }
                else if ((olddir & bitvector) &&
                        !(dir[number] & bitvector))
                {
                    // The bit was set and now its now clear and
                    // we were interrupting on that bit before
                    tsunami->intrctrl->clear(number, TheISA::INTLEVEL_IRQ1, x);
                    DPRINTF(Tsunami, "dim write resulting in clear"
                            " dir interrupt to cpu %d\n", number);

                }


            }
        }
    } else {
        switch(regnum) {
          case TSDEV_CC_CSR:
              panic("TSDEV_CC_CSR write\n");
          case TSDEV_CC_MTR:
              panic("TSDEV_CC_MTR write not implemented\n");
          case TSDEV_CC_MISC:
            uint64_t ipreq;
            ipreq = (pkt->get<uint64_t>() >> 12) & 0xF;
            //If it is bit 12-15, this is an IPI post
            if (ipreq) {
                reqIPI(ipreq);
                supportedWrite = true;
            }

            //If it is bit 8-11, this is an IPI clear
            uint64_t ipintr;
            ipintr = (pkt->get<uint64_t>() >> 8) & 0xF;
            if (ipintr) {
                clearIPI(ipintr);
                supportedWrite = true;
            }

            //If it is the 4-7th bit, clear the RTC interrupt
            uint64_t itintr;