xref: /gem5/src/cpu/o3/regfile.hh

#ifndef __REGFILE_HH__
#define __REGFILE_HH__

// @todo: Destructor

using namespace std;

#include "arch/alpha/isa_traits.hh"
#include "cpu/beta_cpu/comm.hh"

// This really only depends on the ISA, and not the Impl.  It might be nicer
// to see if I can make it depend on nothing...
// Things that are in the ifdef FULL_SYSTEM are pretty dependent on the ISA,
// and should go in the AlphaFullCPU.

template <class Impl>
class PhysRegFile
{
    //Note that most of the definitions of the IntReg, FloatReg, etc. exist
    //within the Impl/ISA class and not within this PhysRegFile class.

    //Will need some way to allow stuff like swap_palshadow to access the
    //correct registers.  Might require code changes to swap_palshadow and
    //other execution contexts.

    //Will make these registers public for now, but they probably should
    //be private eventually with some accessor functions.
  public:
    typedef typename Impl::ISA ISA;

    PhysRegFile(unsigned _numPhysicalIntRegs,
                unsigned _numPhysicalFloatRegs);

    //Everything below should be pretty well identical to the normal
    //register file that exists within AlphaISA class.
    //The duplication is unfortunate but it's better than having
    //different ways to access certain registers.

    //Add these in later when everything else is in place
//    void serialize(std::ostream &os);
//    void unserialize(Checkpoint *cp, const std::string &section);

    uint64_t readIntReg(PhysRegIndex reg_idx)
    {
        assert(reg_idx < numPhysicalIntRegs);

        DPRINTF(IEW, "RegFile: Access to int register %i, has data "
                "%i\n", int(reg_idx), intRegFile[reg_idx]);
        return intRegFile[reg_idx];
    }

    float readFloatRegSingle(PhysRegIndex reg_idx)
    {
        // Remove the base Float reg dependency.
        reg_idx = reg_idx - numPhysicalIntRegs;

        assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);

        DPRINTF(IEW, "RegFile: Access to float register %i as single, has "
                "data %8.8f\n", int(reg_idx), (float)floatRegFile[reg_idx].d);

        return (float)floatRegFile[reg_idx].d;
    }

    double readFloatRegDouble(PhysRegIndex reg_idx)
    {
        // Remove the base Float reg dependency.
        reg_idx = reg_idx - numPhysicalIntRegs;

        assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);

        DPRINTF(IEW, "RegFile: Access to float register %i as double, has "
                " data %8.8f\n", int(reg_idx), floatRegFile[reg_idx].d);

        return floatRegFile[reg_idx].d;
    }

    uint64_t readFloatRegInt(PhysRegIndex reg_idx)
    {
        // Remove the base Float reg dependency.
        reg_idx = reg_idx - numPhysicalIntRegs;

        assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);

        DPRINTF(IEW, "RegFile: Access to float register %i as int, has data "
                "%lli\n", int(reg_idx), floatRegFile[reg_idx].q);

        return floatRegFile[reg_idx].q;
    }

    void setIntReg(PhysRegIndex reg_idx, uint64_t val)
    {
        assert(reg_idx < numPhysicalIntRegs);

        DPRINTF(IEW, "RegFile: Setting int register %i to %lli\n",
                int(reg_idx), val);

        intRegFile[reg_idx] = val;
    }

    void setFloatRegSingle(PhysRegIndex reg_idx, float val)
    {
        // Remove the base Float reg dependency.
        reg_idx = reg_idx - numPhysicalIntRegs;

        assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);

        DPRINTF(IEW, "RegFile: Setting float register %i to %8.8f\n",
                int(reg_idx), val);

        floatRegFile[reg_idx].d = (double)val;
    }

    void setFloatRegDouble(PhysRegIndex reg_idx, double val)
    {
        // Remove the base Float reg dependency.
        reg_idx = reg_idx - numPhysicalIntRegs;

        assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);

        DPRINTF(IEW, "RegFile: Setting float register %i to %8.8f\n",
                int(reg_idx), val);

        floatRegFile[reg_idx].d = val;
    }

    void setFloatRegInt(PhysRegIndex reg_idx, uint64_t val)
    {
        // Remove the base Float reg dependency.
        reg_idx = reg_idx - numPhysicalIntRegs;

        assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);

        DPRINTF(IEW, "RegFile: Setting float register %i to %lli\n",
                int(reg_idx), val);

        floatRegFile[reg_idx].q = val;
    }

    uint64_t readPC()
    {
        return pc;
    }

    void setPC(uint64_t val)
    {
        pc = val;
    }

    void setNextPC(uint64_t val)
    {
        npc = val;
    }

    //Consider leaving this stuff and below in some implementation specific
    //file as opposed to the general register file.  Or have a derived class.
    uint64_t readUniq()
    {
        return miscRegs.uniq;
    }

    void setUniq(uint64_t val)
    {
        miscRegs.uniq = val;
    }

    uint64_t readFpcr()
    {
        return miscRegs.fpcr;
    }

    void setFpcr(uint64_t val)
    {
        miscRegs.fpcr = val;
    }

#ifdef FULL_SYSTEM
    uint64_t readIpr(int idx, Fault &fault);
    Fault setIpr(int idx, uint64_t val);
    int readIntrFlag() { return intrflag; }
    void setIntrFlag(int val) { intrflag = val; }
#endif

    // These should be private eventually, but will be public for now
    // so that I can hack around the initregs issue.
  public:
    /** (signed) integer register file. */
    IntReg *intRegFile;

    /** Floating point register file. */
    FloatReg *floatRegFile;

    /** Miscellaneous register file. */
    MiscRegFile miscRegs;

    Addr pc;            // program counter
    Addr npc;            // next-cycle program counter

  private:
    unsigned numPhysicalIntRegs;
    unsigned numPhysicalFloatRegs;
};

template <class Impl>
PhysRegFile<Impl>::PhysRegFile(unsigned _numPhysicalIntRegs,
                               unsigned _numPhysicalFloatRegs)
    : numPhysicalIntRegs(_numPhysicalIntRegs),
      numPhysicalFloatRegs(_numPhysicalFloatRegs)
{
    intRegFile = new IntReg[numPhysicalIntRegs];
    floatRegFile = new FloatReg[numPhysicalFloatRegs];

    memset(intRegFile, 0, sizeof(*intRegFile));
    memset(floatRegFile, 0, sizeof(*floatRegFile));
}

#ifdef FULL_SYSTEM

//Problem:  This code doesn't make sense at the RegFile level because it
//needs things such as the itb and dtb.  Either put it at the CPU level or
//the DynInst level.
template <class Impl>
uint64_t
PhysRegFile<Impl>::readIpr(int idx, Fault &fault)
{
    uint64_t retval = 0;    // return value, default 0

    switch (idx) {
      case ISA::IPR_PALtemp0:
      case ISA::IPR_PALtemp1:
      case ISA::IPR_PALtemp2:
      case ISA::IPR_PALtemp3:
      case ISA::IPR_PALtemp4:
      case ISA::IPR_PALtemp5:
      case ISA::IPR_PALtemp6:
      case ISA::IPR_PALtemp7:
      case ISA::IPR_PALtemp8:
      case ISA::IPR_PALtemp9:
      case ISA::IPR_PALtemp10:
      case ISA::IPR_PALtemp11:
      case ISA::IPR_PALtemp12:
      case ISA::IPR_PALtemp13:
      case ISA::IPR_PALtemp14:
      case ISA::IPR_PALtemp15:
      case ISA::IPR_PALtemp16:
      case ISA::IPR_PALtemp17:
      case ISA::IPR_PALtemp18:
      case ISA::IPR_PALtemp19:
      case ISA::IPR_PALtemp20:
      case ISA::IPR_PALtemp21:
      case ISA::IPR_PALtemp22:
      case ISA::IPR_PALtemp23:
      case ISA::IPR_PAL_BASE:

      case ISA::IPR_IVPTBR:
      case ISA::IPR_DC_MODE:
      case ISA::IPR_MAF_MODE:
      case ISA::IPR_ISR:
      case ISA::IPR_EXC_ADDR:
      case ISA::IPR_IC_PERR_STAT:
      case ISA::IPR_DC_PERR_STAT:
      case ISA::IPR_MCSR:
      case ISA::IPR_ASTRR:
      case ISA::IPR_ASTER:
      case ISA::IPR_SIRR:
      case ISA::IPR_ICSR:
      case ISA::IPR_ICM:
      case ISA::IPR_DTB_CM:
      case ISA::IPR_IPLR:
      case ISA::IPR_INTID:
      case ISA::IPR_PMCTR:
    // no side-effect
    retval = ipr[idx];
    break;

      case ISA::IPR_CC:
    retval |= ipr[idx] & ULL(0xffffffff00000000);
    retval |= curTick  & ULL(0x00000000ffffffff);
    break;

      case ISA::IPR_VA:
    // SFX: unlocks interrupt status registers
    retval = ipr[idx];

        if (!misspeculating())
            regs.intrlock = false;
    break;

      case ISA::IPR_VA_FORM:
      case ISA::IPR_MM_STAT:
      case ISA::IPR_IFAULT_VA_FORM:
      case ISA::IPR_EXC_MASK:
      case ISA::IPR_EXC_SUM:
    retval = ipr[idx];
    break;

      case ISA::IPR_DTB_PTE:
    {
        ISA::PTE &pte = dtb->index(!misspeculating());

        retval |= ((u_int64_t)pte.ppn & ULL(0x7ffffff)) << 32;
        retval |= ((u_int64_t)pte.xre & ULL(0xf)) << 8;
        retval |= ((u_int64_t)pte.xwe & ULL(0xf)) << 12;
        retval |= ((u_int64_t)pte.fonr & ULL(0x1)) << 1;
        retval |= ((u_int64_t)pte.fonw & ULL(0x1))<< 2;
        retval |= ((u_int64_t)pte.asma & ULL(0x1)) << 4;
        retval |= ((u_int64_t)pte.asn & ULL(0x7f)) << 57;
    }
    break;

    // write only registers
      case ISA::IPR_HWINT_CLR:
      case ISA::IPR_SL_XMIT:
      case ISA::IPR_DC_FLUSH:
      case ISA::IPR_IC_FLUSH:
      case ISA::IPR_ALT_MODE:
      case ISA::IPR_DTB_IA:
      case ISA::IPR_DTB_IAP:
      case ISA::IPR_ITB_IA:
      case ISA::IPR_ITB_IAP:
    fault = Unimplemented_Opcode_Fault;
    break;

      default:
    // invalid IPR
    fault = Unimplemented_Opcode_Fault;
    break;
    }

    return retval;
}

#ifdef DEBUG
// Cause the simulator to break when changing to the following IPL
int break_ipl = -1;
#endif

template <class Impl>
Fault
PhysRegFile<Impl>::setIpr(int idx, uint64_t val)
{
    uint64_t old;

    if (misspeculating())
    return No_Fault;

    switch (idx) {
      case ISA::IPR_PALtemp0:
      case ISA::IPR_PALtemp1:
      case ISA::IPR_PALtemp2:
      case ISA::IPR_PALtemp3:
      case ISA::IPR_PALtemp4:
      case ISA::IPR_PALtemp5:
      case ISA::IPR_PALtemp6:
      case ISA::IPR_PALtemp7:
      case ISA::IPR_PALtemp8:
      case ISA::IPR_PALtemp9:
      case ISA::IPR_PALtemp10:
      case ISA::IPR_PALtemp11:
      case ISA::IPR_PALtemp12:
      case ISA::IPR_PALtemp13:
      case ISA::IPR_PALtemp14:
      case ISA::IPR_PALtemp15:
      case ISA::IPR_PALtemp16:
      case ISA::IPR_PALtemp17:
      case ISA::IPR_PALtemp18:
      case ISA::IPR_PALtemp19:
      case ISA::IPR_PALtemp20:
      case ISA::IPR_PALtemp21:
      case ISA::IPR_PALtemp22:
      case ISA::IPR_PAL_BASE:
      case ISA::IPR_IC_PERR_STAT:
      case ISA::IPR_DC_PERR_STAT:
      case ISA::IPR_PMCTR:
    // write entire quad w/ no side-effect
    ipr[idx] = val;
    break;

      case ISA::IPR_CC_CTL:
    // This IPR resets the cycle counter.  We assume this only
    // happens once... let's verify that.
    assert(ipr[idx] == 0);
    ipr[idx] = 1;
    break;

      case ISA::IPR_CC:
    // This IPR only writes the upper 64 bits.  It's ok to write
    // all 64 here since we mask out the lower 32 in rpcc (see
    // isa_desc).
    ipr[idx] = val;
    break;

      case ISA::IPR_PALtemp23:
    // write entire quad w/ no side-effect
    old = ipr[idx];
    ipr[idx] = val;
    kernelStats.context(old, val);
    break;

      case ISA::IPR_DTB_PTE:
    // write entire quad w/ no side-effect, tag is forthcoming
    ipr[idx] = val;
    break;

      case ISA::IPR_EXC_ADDR:
    // second least significant bit in PC is always zero
    ipr[idx] = val & ~2;
    break;

      case ISA::IPR_ASTRR:
      case ISA::IPR_ASTER:
    // only write least significant four bits - privilege mask
    ipr[idx] = val & 0xf;
    break;

      case ISA::IPR_IPLR:
#ifdef DEBUG
    if (break_ipl != -1 && break_ipl == (val & 0x1f))
        debug_break();
#endif

    // only write least significant five bits - interrupt level
    ipr[idx] = val & 0x1f;
    kernelStats.swpipl(ipr[idx]);
    break;

      case ISA::IPR_DTB_CM:
    kernelStats.mode((val & 0x18) != 0);

      case ISA::IPR_ICM:
    // only write two mode bits - processor mode
    ipr[idx] = val & 0x18;
    break;

      case ISA::IPR_ALT_MODE:
    // only write two mode bits - processor mode
    ipr[idx] = val & 0x18;
    break;

      case ISA::IPR_MCSR:
    // more here after optimization...
    ipr[idx] = val;
    break;

      case ISA::IPR_SIRR:
    // only write software interrupt mask
    ipr[idx] = val & 0x7fff0;
    break;

      case ISA::IPR_ICSR:
    ipr[idx] = val & ULL(0xffffff0300);
    break;

      case ISA::IPR_IVPTBR:
      case ISA::IPR_MVPTBR:
    ipr[idx] = val & ULL(0xffffffffc0000000);
    break;

      case ISA::IPR_DC_TEST_CTL:
    ipr[idx] = val & 0x1ffb;
    break;

      case ISA::IPR_DC_MODE:
      case ISA::IPR_MAF_MODE:
    ipr[idx] = val & 0x3f;
    break;

      case ISA::IPR_ITB_ASN:
    ipr[idx] = val & 0x7f0;
    break;

      case ISA::IPR_DTB_ASN:
    ipr[idx] = val & ULL(0xfe00000000000000);
    break;

      case ISA::IPR_EXC_SUM:
      case ISA::IPR_EXC_MASK:
    // any write to this register clears it
    ipr[idx] = 0;
    break;

      case ISA::IPR_INTID:
      case ISA::IPR_SL_RCV:
      case ISA::IPR_MM_STAT:
      case ISA::IPR_ITB_PTE_TEMP:
      case ISA::IPR_DTB_PTE_TEMP:
    // read-only registers
    return Unimplemented_Opcode_Fault;

      case ISA::IPR_HWINT_CLR:
      case ISA::IPR_SL_XMIT:
      case ISA::IPR_DC_FLUSH:
      case ISA::IPR_IC_FLUSH:
    // the following are write only
    ipr[idx] = val;
    break;

      case ISA::IPR_DTB_IA:
    // really a control write
    ipr[idx] = 0;

    dtb->flushAll();
    break;

      case ISA::IPR_DTB_IAP:
    // really a control write
    ipr[idx] = 0;

    dtb->flushProcesses();
    break;

      case ISA::IPR_DTB_IS:
    // really a control write
    ipr[idx] = val;

    dtb->flushAddr(val, DTB_ASN_ASN(ipr[ISA::IPR_DTB_ASN]));
    break;

      case ISA::IPR_DTB_TAG: {
      struct ISA::PTE pte;

      // FIXME: granularity hints NYI...
      if (DTB_PTE_GH(ipr[ISA::IPR_DTB_PTE]) != 0)
          panic("PTE GH field != 0");

      // write entire quad
      ipr[idx] = val;

      // construct PTE for new entry
      pte.ppn = DTB_PTE_PPN(ipr[ISA::IPR_DTB_PTE]);
      pte.xre = DTB_PTE_XRE(ipr[ISA::IPR_DTB_PTE]);
      pte.xwe = DTB_PTE_XWE(ipr[ISA::IPR_DTB_PTE]);
      pte.fonr = DTB_PTE_FONR(ipr[ISA::IPR_DTB_PTE]);
      pte.fonw = DTB_PTE_FONW(ipr[ISA::IPR_DTB_PTE]);
      pte.asma = DTB_PTE_ASMA(ipr[ISA::IPR_DTB_PTE]);
      pte.asn = DTB_ASN_ASN(ipr[ISA::IPR_DTB_ASN]);

      // insert new TAG/PTE value into data TLB
      dtb->insert(val, pte);
      }
    break;

      case ISA::IPR_ITB_PTE: {
      struct ISA::PTE pte;

      // FIXME: granularity hints NYI...
      if (ITB_PTE_GH(val) != 0)
          panic("PTE GH field != 0");

      // write entire quad
      ipr[idx] = val;

      // construct PTE for new entry
      pte.ppn = ITB_PTE_PPN(val);
      pte.xre = ITB_PTE_XRE(val);
      pte.xwe = 0;
      pte.fonr = ITB_PTE_FONR(val);
      pte.fonw = ITB_PTE_FONW(val);
      pte.asma = ITB_PTE_ASMA(val);
      pte.asn = ITB_ASN_ASN(ipr[ISA::IPR_ITB_ASN]);

      // insert new TAG/PTE value into data TLB
      itb->insert(ipr[ISA::IPR_ITB_TAG], pte);
      }
    break;

      case ISA::IPR_ITB_IA:
    // really a control write
    ipr[idx] = 0;

    itb->flushAll();
    break;

      case ISA::IPR_ITB_IAP:
    // really a control write
    ipr[idx] = 0;

    itb->flushProcesses();
    break;

      case ISA::IPR_ITB_IS:
    // really a control write
    ipr[idx] = val;

    itb->flushAddr(val, ITB_ASN_ASN(ipr[ISA::IPR_ITB_ASN]));
    break;

      default:
    // invalid IPR
    return Unimplemented_Opcode_Fault;
    }

    // no error...
    return No_Fault;
}

#endif // #ifdef FULL_SYSTEM

#endif // __REGFILE_HH__