gem5/cpu/o3/alpha_cpu.hh
Gabe Black 68d7382cf3 Eliminated TARGET_ALPHA, since THE_ISA provides the same function.
--HG--
extra : convert_revision : eb173a553b0782891e8b4a8e227bfb647390883a
2006-03-10 16:26:31 -05:00

291 lines
9.1 KiB
C++

/*
* 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.
*/
// Todo: Find all the stuff in ExecContext and ev5 that needs to be
// specifically designed for this CPU.
#ifndef __CPU_O3_CPU_ALPHA_FULL_CPU_HH__
#define __CPU_O3_CPU_ALPHA_FULL_CPU_HH__
#include "cpu/o3/cpu.hh"
#include "arch/isa_traits.hh"
#include "sim/byteswap.hh"
template <class Impl>
class AlphaFullCPU : public FullO3CPU<Impl>
{
protected:
typedef TheISA::IntReg IntReg;
typedef TheISA::MiscReg MiscReg;
typedef TheISA::RegFile RegFile;
typedef TheISA::MiscRegFile MiscRegFile;
public:
typedef typename Impl::Params Params;
public:
AlphaFullCPU(Params &params);
#if FULL_SYSTEM
AlphaITB *itb;
AlphaDTB *dtb;
#endif
public:
void regStats();
#if FULL_SYSTEM
//Note that the interrupt stuff from the base CPU might be somewhat
//ISA specific (ie NumInterruptLevels). These functions might not
//be needed in FullCPU though.
// void post_interrupt(int int_num, int index);
// void clear_interrupt(int int_num, int index);
// void clear_interrupts();
Fault translateInstReq(MemReqPtr &req)
{
return itb->translate(req);
}
Fault translateDataReadReq(MemReqPtr &req)
{
return dtb->translate(req, false);
}
Fault translateDataWriteReq(MemReqPtr &req)
{
return dtb->translate(req, true);
}
#else
Fault dummyTranslation(MemReqPtr &req)
{
#if 0
assert((req->vaddr >> 48 & 0xffff) == 0);
#endif
// put the asid in the upper 16 bits of the paddr
req->paddr = req->vaddr & ~((Addr)0xffff << sizeof(Addr) * 8 - 16);
req->paddr = req->paddr | (Addr)req->asid << sizeof(Addr) * 8 - 16;
return NoFault;
}
Fault translateInstReq(MemReqPtr &req)
{
return dummyTranslation(req);
}
Fault translateDataReadReq(MemReqPtr &req)
{
return dummyTranslation(req);
}
Fault translateDataWriteReq(MemReqPtr &req)
{
return dummyTranslation(req);
}
#endif
// Later on may want to remove this misc stuff from the regfile and
// have it handled at this level. Might prove to be an issue when
// trying to rename source/destination registers...
MiscReg readMiscReg(int misc_reg)
{
// Dummy function for now.
// @todo: Fix this once reg file gets fixed.
return 0;
}
Fault setMiscReg(int misc_reg, const MiscReg &val)
{
// Dummy function for now.
// @todo: Fix this once reg file gets fixed.
return NoFault;
}
// Most of the full system code and syscall emulation is not yet
// implemented. These functions do show what the final interface will
// look like.
#if FULL_SYSTEM
int readIntrFlag();
void setIntrFlag(int val);
Fault hwrei();
bool inPalMode() { return AlphaISA::PcPAL(this->regFile.readPC()); }
bool inPalMode(uint64_t PC)
{ return AlphaISA::PcPAL(PC); }
void trap(Fault fault);
bool simPalCheck(int palFunc);
void processInterrupts();
#endif
#if !FULL_SYSTEM
// Need to change these into regfile calls that directly set a certain
// register. Actually, these functions should handle most of this
// functionality by themselves; should look up the rename and then
// set the register.
IntReg getSyscallArg(int i)
{
return this->cpuXC->readIntReg(AlphaISA::ArgumentReg0 + i);
}
// used to shift args for indirect syscall
void setSyscallArg(int i, IntReg val)
{
this->cpuXC->setIntReg(AlphaISA::ArgumentReg0 + i, val);
}
void setSyscallReturn(int64_t return_value)
{
// check for error condition. Alpha syscall convention is to
// indicate success/failure in reg a3 (r19) and put the
// return value itself in the standard return value reg (v0).
const int RegA3 = 19; // only place this is used
if (return_value >= 0) {
// no error
this->cpuXC->setIntReg(RegA3, 0);
this->cpuXC->setIntReg(AlphaISA::ReturnValueReg, return_value);
} else {
// got an error, return details
this->cpuXC->setIntReg(RegA3, (IntReg) -1);
this->cpuXC->setIntReg(AlphaISA::ReturnValueReg, -return_value);
}
}
void syscall(short thread_num);
void squashStages();
#endif
void copyToXC();
void copyFromXC();
public:
#if FULL_SYSTEM
bool palShadowEnabled;
// Not sure this is used anywhere.
void intr_post(RegFile *regs, Fault fault, Addr pc);
// Actually used within exec files. Implement properly.
void swapPALShadow(bool use_shadow);
// Called by CPU constructor. Can implement as I please.
void initCPU(RegFile *regs);
// Called by initCPU. Implement as I please.
void initIPRs(RegFile *regs);
void halt() { panic("Halt not implemented!\n"); }
#endif
template <class T>
Fault read(MemReqPtr &req, T &data)
{
#if FULL_SYSTEM && THE_ISA == ALPHA_ISA
if (req->flags & LOCKED) {
req->xc->setMiscReg(TheISA::Lock_Addr_DepTag, req->paddr);
req->xc->setMiscReg(TheISA::Lock_Flag_DepTag, true);
}
#endif
Fault error;
error = this->mem->read(req, data);
data = gtoh(data);
return error;
}
template <class T>
Fault read(MemReqPtr &req, T &data, int load_idx)
{
return this->iew.ldstQueue.read(req, data, load_idx);
}
template <class T>
Fault write(MemReqPtr &req, T &data)
{
#if FULL_SYSTEM && THE_ISA == ALPHA_ISA
ExecContext *xc;
// If this is a store conditional, act appropriately
if (req->flags & LOCKED) {
xc = req->xc;
if (req->flags & UNCACHEABLE) {
// Don't update result register (see stq_c in isa_desc)
req->result = 2;
xc->setStCondFailures(0);//Needed? [RGD]
} else {
bool lock_flag = xc->readMiscReg(TheISA::Lock_Flag_DepTag);
Addr lock_addr = xc->readMiscReg(TheISA::Lock_Addr_DepTag);
req->result = lock_flag;
if (!lock_flag ||
((lock_addr & ~0xf) != (req->paddr & ~0xf))) {
xc->setMiscReg(TheISA::Lock_Flag_DepTag, false);
xc->setStCondFailures(xc->readStCondFailures() + 1);
if (((xc->readStCondFailures()) % 100000) == 0) {
std::cerr << "Warning: "
<< xc->readStCondFailures()
<< " consecutive store conditional failures "
<< "on cpu " << req->xc->readCpuId()
<< std::endl;
}
return NoFault;
}
else xc->setStCondFailures(0);
}
}
// Need to clear any locked flags on other proccessors for
// this address. Only do this for succsful Store Conditionals
// and all other stores (WH64?). Unsuccessful Store
// Conditionals would have returned above, and wouldn't fall
// through.
for (int i = 0; i < this->system->execContexts.size(); i++){
xc = this->system->execContexts[i];
if ((xc->readMiscReg(TheISA::Lock_Addr_DepTag) & ~0xf) ==
(req->paddr & ~0xf)) {
xc->setMiscReg(TheISA::Lock_Flag_DepTag, false);
}
}
#endif
return this->mem->write(req, (T)htog(data));
}
template <class T>
Fault write(MemReqPtr &req, T &data, int store_idx)
{
return this->iew.ldstQueue.write(req, data, store_idx);
}
};
#endif // __CPU_O3_CPU_ALPHA_FULL_CPU_HH__