types.hh

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/*
 * Copyright (c) 2003-2005 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,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __BASE_TYPES_HH__
#define __BASE_TYPES_HH__

#include <inttypes.h>

#include <cassert>
#include <memory>
#include <ostream>
#include <stdexcept>

#include "base/refcnt.hh"

#define ULL(N)          ((uint64_t)N##ULL)

#define LL(N)           ((int64_t)N##LL)

typedef int64_t Counter;

typedef uint64_t Tick;

const Tick MaxTick = ULL(0xffffffffffffffff);

class Cycles
{

  private:

    uint64_t c;

  public:

    explicit constexpr Cycles(uint64_t _c) : c(_c) { }

    Cycles() : c(0) { }

    constexpr operator uint64_t() const { return c; }

    Cycles& operator++()
    { ++c; return *this; }

    Cycles& operator--()
    { assert(c != 0); --c; return *this; }

    Cycles& operator+=(const Cycles& cc)
    { c += cc.c; return *this; }

    constexpr bool operator>(const Cycles& cc) const
    { return c > cc.c; }

    constexpr Cycles operator +(const Cycles& b) const
    { return Cycles(c + b.c); }

    constexpr Cycles operator -(const Cycles& b) const
    {
        return c >= b.c ? Cycles(c - b.c) :
            throw std::invalid_argument("RHS cycle value larger than LHS");
    }

    constexpr Cycles operator <<(const int32_t shift) const
    { return Cycles(c << shift); }

    constexpr Cycles operator >>(const int32_t shift) const
    { return Cycles(c >> shift); }

    friend std::ostream& operator<<(std::ostream &out, const Cycles & cycles);
};

typedef uint64_t Addr;

typedef uint16_t MicroPC;

static const MicroPC MicroPCRomBit = 1 << (sizeof(MicroPC) * 8 - 1);

static inline MicroPC
romMicroPC(MicroPC upc)
{
    return upc | MicroPCRomBit;
}

static inline MicroPC
normalMicroPC(MicroPC upc)
{
    return upc & ~MicroPCRomBit;
}

static inline bool
isRomMicroPC(MicroPC upc)
{
    return MicroPCRomBit & upc;
}

const Addr MaxAddr = (Addr)-1;

typedef uint64_t RegVal;

static inline uint32_t
floatToBits32(float val)
{
    union
    {
        float f;
        uint32_t i;
    } u;
    u.f = val;
    return u.i;
}

static inline uint64_t
floatToBits64(double val)
{
    union
    {
        double f;
        uint64_t i;
    } u;
    u.f = val;
    return u.i;
}

static inline uint64_t floatToBits(double val) { return floatToBits64(val); }
static inline uint32_t floatToBits(float val) { return floatToBits32(val); }

static inline float
bitsToFloat32(uint32_t val)
{
    union
    {
        float f;
        uint32_t i;
    } u;
    u.i = val;
    return u.f;
}

static inline double
bitsToFloat64(uint64_t val)
{
    union
    {
        double f;
        uint64_t i;
    } u;
    u.i = val;
    return u.f;
}

static inline double bitsToFloat(uint64_t val) { return bitsToFloat64(val); }
static inline float bitsToFloat(uint32_t val) { return bitsToFloat32(val); }

typedef int16_t ThreadID;
const ThreadID InvalidThreadID = (ThreadID)-1;

typedef int ContextID;
const ContextID InvalidContextID = (ContextID)-1;

typedef int16_t PortID;
const PortID InvalidPortID = (PortID)-1;

class FaultBase;
typedef std::shared_ptr<FaultBase> Fault;

// Rather than creating a shared_ptr instance and assigning it nullptr,
// we just create an alias.
constexpr decltype(nullptr) NoFault = nullptr;

enum ByteOrder {
    BigEndianByteOrder,
    LittleEndianByteOrder
};

#endif // __BASE_TYPES_HH__