exec_context.hh

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 * Copyright (c) 2013 Advanced Micro Devices, Inc.
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#ifndef __CPU_MINOR_EXEC_CONTEXT_HH__
#define __CPU_MINOR_EXEC_CONTEXT_HH__
 
#include "cpu/exec_context.hh"
#include "cpu/minor/execute.hh"
#include "cpu/minor/pipeline.hh"
#include "cpu/base.hh"
#include "cpu/simple_thread.hh"
#include "mem/request.hh"
#include "debug/MinorExecute.hh"
 
namespace gem5
{
 
namespace minor
{
 
/* Forward declaration of Execute */
class Execute;
 
class ExecContext : public gem5::ExecContext
{
  public:
    MinorCPU &cpu;
 
    SimpleThread &thread;
 
    Execute &execute;
 
    MinorDynInstPtr inst;
 
    ExecContext (
        MinorCPU &cpu_,
        SimpleThread &thread_, Execute &execute_,
        MinorDynInstPtr inst_) :
        cpu(cpu_),
        thread(thread_),
        execute(execute_),
        inst(inst_)
    {
        DPRINTF(MinorExecute, "ExecContext setting PC: %s\n", *inst->pc);
        pcState(*inst->pc);
        setPredicate(inst->readPredicate());
        setMemAccPredicate(inst->readMemAccPredicate());
    }
 
    ~ExecContext()
    {
        inst->setPredicate(readPredicate());
        inst->setMemAccPredicate(readMemAccPredicate());
    }
 
    Fault
    initiateMemRead(Addr addr, unsigned int size,
                    Request::Flags flags,
                    const std::vector<bool>& byte_enable) override
    {
        assert(byte_enable.size() == size);
        return execute.getLSQ().pushRequest(inst, true /* load */, nullptr,
            size, addr, flags, nullptr, nullptr, byte_enable);
    }
 
    Fault
    initiateMemMgmtCmd(Request::Flags flags) override
    {
        panic("ExecContext::initiateMemMgmtCmd() not implemented "
              " on MinorCPU\n");
        return NoFault;
    }
 
    Fault
    writeMem(uint8_t *data, unsigned int size, Addr addr,
             Request::Flags flags, uint64_t *res,
             const std::vector<bool>& byte_enable)
        override
    {
        assert(byte_enable.size() == size);
        return execute.getLSQ().pushRequest(inst, false /* store */, data,
            size, addr, flags, res, nullptr, byte_enable);
    }
 
    Fault
    initiateMemAMO(Addr addr, unsigned int size, Request::Flags flags,
                   AtomicOpFunctorPtr amo_op) override
    {
        // AMO requests are pushed through the store path
        return execute.getLSQ().pushRequest(inst, false /* amo */, nullptr,
            size, addr, flags, nullptr, std::move(amo_op),
            std::vector<bool>(size, true));
    }
 
    RegVal
    getRegOperand(const StaticInst *si, int idx) override
    {
        const RegId &reg = si->srcRegIdx(idx);
        if (reg.is(InvalidRegClass))
            return 0;
        return thread.getReg(reg);
    }
 
    void
    getRegOperand(const StaticInst *si, int idx, void *val) override
    {
        thread.getReg(si->srcRegIdx(idx), val);
    }
 
    void *
    getWritableRegOperand(const StaticInst *si, int idx) override
    {
        return thread.getWritableReg(si->destRegIdx(idx));
    }
 
    void
    setRegOperand(const StaticInst *si, int idx, RegVal val) override
    {
        const RegId &reg = si->destRegIdx(idx);
        if (reg.is(InvalidRegClass))
            return;
        thread.setReg(si->destRegIdx(idx), val);
    }
 
    void
    setRegOperand(const StaticInst *si, int idx, const void *val) override
    {
        thread.setReg(si->destRegIdx(idx), val);
    }
 
    bool
    readPredicate() const override
    {
        return thread.readPredicate();
    }
 
    void
    setPredicate(bool val) override
    {
        thread.setPredicate(val);
    }
 
    bool
    readMemAccPredicate() const override
    {
        return thread.readMemAccPredicate();
    }
 
    void
    setMemAccPredicate(bool val) override
    {
        thread.setMemAccPredicate(val);
    }
 
    // hardware transactional memory
    uint64_t
    getHtmTransactionUid() const override
    {
        panic("ExecContext::getHtmTransactionUid() not"
              "implemented on MinorCPU\n");
        return 0;
    }
 
    uint64_t
    newHtmTransactionUid() const override
    {
        panic("ExecContext::newHtmTransactionUid() not"
              "implemented on MinorCPU\n");
        return 0;
    }
 
    bool
    inHtmTransactionalState() const override
    {
        // ExecContext::inHtmTransactionalState() not
        // implemented on MinorCPU
        return false;
    }
 
    uint64_t
    getHtmTransactionalDepth() const override
    {
        panic("ExecContext::getHtmTransactionalDepth() not"
              "implemented on MinorCPU\n");
        return 0;
    }
 
    const PCStateBase &
    pcState() const override
    {
        return thread.pcState();
    }
 
    void
    pcState(const PCStateBase &val) override
    {
        thread.pcState(val);
    }
 
    RegVal
    readMiscRegNoEffect(int misc_reg) const
    {
        return thread.readMiscRegNoEffect(misc_reg);
    }
 
    RegVal
    readMiscReg(int misc_reg) override
    {
        return thread.readMiscReg(misc_reg);
    }
 
    void
    setMiscReg(int misc_reg, RegVal val) override
    {
        thread.setMiscReg(misc_reg, val);
    }
 
    RegVal
    readMiscRegOperand(const StaticInst *si, int idx) override
    {
        const RegId& reg = si->srcRegIdx(idx);
        assert(reg.is(MiscRegClass));
        return thread.readMiscReg(reg.index());
    }
 
    void
    setMiscRegOperand(const StaticInst *si, int idx, RegVal val) override
    {
        const RegId& reg = si->destRegIdx(idx);
        assert(reg.is(MiscRegClass));
        return thread.setMiscReg(reg.index(), val);
    }
 
    ThreadContext *tcBase() const override { return thread.getTC(); }
 
    /* @todo, should make stCondFailures persistent somewhere */
    unsigned int readStCondFailures() const override { return 0; }
    void setStCondFailures(unsigned int st_cond_failures) override {}
 
    ContextID contextId() { return thread.contextId(); }
    /* ISA-specific (or at least currently ISA singleton) functions */
 
    /* X86: TLB twiddling */
    void
    demapPage(Addr vaddr, uint64_t asn) override
    {
        thread.getMMUPtr()->demapPage(vaddr, asn);
    }
 
    BaseCPU *getCpuPtr() { return &cpu; }
 
  public:
    // monitor/mwait funtions
    void
    armMonitor(Addr address) override
    {
        getCpuPtr()->armMonitor(inst->id.threadId, address);
    }
 
    bool
    mwait(PacketPtr pkt) override
    {
        return getCpuPtr()->mwait(inst->id.threadId, pkt);
    }
 
    void
    mwaitAtomic(ThreadContext *tc) override
    {
        return getCpuPtr()->mwaitAtomic(inst->id.threadId, tc, thread.mmu);
    }
 
    AddressMonitor *
    getAddrMonitor() override
    {
        return getCpuPtr()->getCpuAddrMonitor(inst->id.threadId);
    }
};
 
} // namespace minor
} // namespace gem5
 
#endif /* __CPU_MINOR_EXEC_CONTEXT_HH__ */