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/*
* Copyright (c) 2004-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Kevin Lim
* Gabe Black
*/
#ifndef __CPU_O3_REGFILE_HH__
#define __CPU_O3_REGFILE_HH__
#include <vector>
#include "arch/isa_traits.hh"
#include "arch/types.hh"
#include "base/trace.hh"
#include "config/full_system.hh"
#include "config/the_isa.hh"
#include "cpu/o3/comm.hh"
#if FULL_SYSTEM
#include "arch/kernel_stats.hh"
#endif
/**
* Simple physical register file class.
* Right now this is specific to Alpha until we decide if/how to make things
* generic enough to support other ISAs.
*/
template <class Impl>
class PhysRegFile
{
protected:
typedef TheISA::IntReg IntReg;
typedef TheISA::FloatReg FloatReg;
typedef TheISA::FloatRegBits FloatRegBits;
typedef union {
FloatReg d;
FloatRegBits q;
} PhysFloatReg;
// Note that most of the definitions of the IntReg, FloatReg, etc. exist
// within the Impl/ISA class and not within this PhysRegFile class.
// Will make these registers public for now, but they probably should
// be private eventually with some accessor functions.
public:
typedef typename Impl::O3CPU O3CPU;
/**
* Constructs a physical register file with the specified amount of
* integer and floating point registers.
*/
PhysRegFile(O3CPU *_cpu, 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.
/** Reads an integer register. */
uint64_t readIntReg(PhysRegIndex reg_idx)
{
assert(reg_idx < numPhysicalIntRegs);
DPRINTF(IEW, "RegFile: Access to int register %i, has data "
"%#x\n", int(reg_idx), intRegFile[reg_idx]);
return intRegFile[reg_idx];
}
/** Reads a floating point register (double precision). */
FloatReg readFloatReg(PhysRegIndex reg_idx)
{
// Remove the base Float reg dependency.
reg_idx = reg_idx - numPhysicalIntRegs;
assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
FloatReg floatReg = floatRegFile[reg_idx].d;
DPRINTF(IEW, "RegFile: Access to float register %i, has "
"data %#x\n", int(reg_idx), floatRegFile[reg_idx].q);
return floatReg;
}
FloatRegBits readFloatRegBits(PhysRegIndex reg_idx)
{
// Remove the base Float reg dependency.
reg_idx = reg_idx - numPhysicalIntRegs;
assert(reg_idx < numPhysicalFloatRegs + numPhysicalIntRegs);
FloatRegBits floatRegBits = floatRegFile[reg_idx].q;
DPRINTF(IEW, "RegFile: Access to float register %i as int, "
"has data %#x\n", int(reg_idx), (uint64_t)floatRegBits);
return floatRegBits;
}
/** Sets an integer register to the given value. */
void setIntReg(PhysRegIndex reg_idx, uint64_t val)
{
assert(reg_idx < numPhysicalIntRegs);
DPRINTF(IEW, "RegFile: Setting int register %i to %#x\n",
int(reg_idx), val);
if (reg_idx != TheISA::ZeroReg)
intRegFile[reg_idx] = val;
}
/** Sets a double precision floating point register to the given value. */
void setFloatReg(PhysRegIndex reg_idx, FloatReg val)
{
// Remove the base Float reg dependency.
reg_idx = reg_idx - numPhysicalIntRegs;
assert(reg_idx < numPhysicalFloatRegs);
DPRINTF(IEW, "RegFile: Setting float register %i to %#x\n",
int(reg_idx), (uint64_t)val);
#if THE_ISA == ALPHA_ISA
if (reg_idx != TheISA::ZeroReg)
#endif
floatRegFile[reg_idx].d = val;
}
void setFloatRegBits(PhysRegIndex reg_idx, FloatRegBits val)
{
// Remove the base Float reg dependency.
reg_idx = reg_idx - numPhysicalIntRegs;
assert(reg_idx < numPhysicalFloatRegs);
DPRINTF(IEW, "RegFile: Setting float register %i to %#x\n",
int(reg_idx), (uint64_t)val);
floatRegFile[reg_idx].q = val;
}
public:
/** (signed) integer register file. */
IntReg *intRegFile;
/** Floating point register file. */
PhysFloatReg *floatRegFile;
#if FULL_SYSTEM
private:
int intrflag; // interrupt flag
#endif
private:
/** CPU pointer. */
O3CPU *cpu;
public:
/** Number of physical integer registers. */
unsigned numPhysicalIntRegs;
/** Number of physical floating point registers. */
unsigned numPhysicalFloatRegs;
};
template <class Impl>
PhysRegFile<Impl>::PhysRegFile(O3CPU *_cpu, unsigned _numPhysicalIntRegs,
unsigned _numPhysicalFloatRegs)
: cpu(_cpu), numPhysicalIntRegs(_numPhysicalIntRegs),
numPhysicalFloatRegs(_numPhysicalFloatRegs)
{
intRegFile = new IntReg[numPhysicalIntRegs];
floatRegFile = new PhysFloatReg[numPhysicalFloatRegs];
memset(intRegFile, 0, sizeof(IntReg) * numPhysicalIntRegs);
memset(floatRegFile, 0, sizeof(PhysFloatReg) * numPhysicalFloatRegs);
}
#endif
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