isa_traits.hh

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 * modified or unmodified, in source code or in binary form.
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 * Copyright (c) 2003-2005 The Regents of The University of Michigan
 * Copyright (c) 2007-2008 The Florida State University
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 * Authors: Gabe Black
 *          Stephen Hines
 */

#ifndef __ARCH_ARM_ISA_TRAITS_HH__
#define __ARCH_ARM_ISA_TRAITS_HH__

#include "arch/arm/types.hh"
#include "base/types.hh"
#include "cpu/static_inst_fwd.hh"

namespace ArmISA
{
    const ByteOrder GuestByteOrder = LittleEndianByteOrder;

    StaticInstPtr decodeInst(ExtMachInst);

    const Addr PageShift = 12;
    const Addr PageBytes = ULL(1) << PageShift;
    const Addr Page_Mask = ~(PageBytes - 1);
    const Addr PageOffset = PageBytes - 1;


    //
    //  Translation stuff
    //

    const Addr PteShift = 3;
    const Addr NPtePageShift = PageShift - PteShift;
    const Addr NPtePage = ULL(1) << NPtePageShift;
    const Addr PteMask = NPtePage - 1;

    // User Segment - Mapped
    const Addr USegBase = ULL(0x0);
    const Addr USegEnd = ULL(0x7FFFFFFF);

    const unsigned VABits = 32;
    const unsigned PABits = 32; // Is this correct?
    const Addr VAddrImplMask = (ULL(1) << VABits) - 1;
    const Addr VAddrUnImplMask = ~VAddrImplMask;
    inline Addr VAddrImpl(Addr a) { return a & VAddrImplMask; }
    inline Addr VAddrVPN(Addr a) { return a >> ArmISA::PageShift; }
    inline Addr VAddrOffset(Addr a) { return a & ArmISA::PageOffset; }

    const Addr PAddrImplMask = (ULL(1) << PABits) - 1;

    // Max. physical address range in bits supported by the architecture
    const unsigned MaxPhysAddrRange = 48;

    const int MachineBytes = 4;

    const uint32_t HighVecs = 0xFFFF0000;

    // Memory accesses cannot be unaligned
    const bool HasUnalignedMemAcc = true;

    const bool CurThreadInfoImplemented = false;
    const int CurThreadInfoReg = -1;

    enum InterruptTypes
    {
        INT_RST,
        INT_ABT,
        INT_IRQ,
        INT_FIQ,
        INT_SEV, // Special interrupt for recieving SEV's
        INT_VIRT_IRQ,
        INT_VIRT_FIQ,
        NumInterruptTypes
    };
} // namespace ArmISA

using namespace ArmISA;

#endif // __ARCH_ARM_ISA_TRAITS_HH__