Initial commit of OpenSPARC T2 architecture model.

[OpenSPARC-T2-SAM] / sam-t2 / sam / cpus / vonk / bl / lib / ecc / src / BL_BaseSynd.h

/*
* ========== Copyright Header Begin ==========================================
* 
* OpenSPARC T2 Processor File: BL_BaseSynd.h
* Copyright (c) 2006 Sun Microsystems, Inc.  All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.
* 
* The above named program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
* 
* The above named program is distributed in the hope that it will be 
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* General Public License for more details.
* 
* You should have received a copy of the GNU General Public
* License along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
* 
* ========== Copyright Header End ============================================
*/
/************************************************************************
**  
**  Copyright (C) 2006, Sun Microsystems, Inc.
**
**  Sun considers its source code as an unpublished, proprietary
**  trade secret and it is available only under strict license provisions.
**  This copyright notice is placed here only to protect Sun in the event 
**  the source is deemed a published work. Disassembly, decompilation,
**  or other means of reducing the object code to human readable form
**  is prohibited by the license agreement under which this code is
**  provided to the user or company in possession of this copy.
**
*************************************************************************/
#ifndef __BL_BaseSynd_h__
#define __BL_BaseSynd_h__
#include "BL_BitUtility.h"

class BL_BaseSynd 
{
  public:	

    BL_BaseSynd(uint32_t syndrome) :
    syndrome_(syndrome) {}
  
    ~BL_BaseSynd() {}

    /**
     * Assignment operator
     * 
     * @param rhs The right hand side of the assignment operator.
     * @return The lvalue of the assignment.
     */
    const BL_BaseSynd & operator=( const BL_BaseSynd &rhs ) 
    {
      syndrome_ = rhs.syndrome_;
      return *this;
    }

    uint32_t getSyndrome() const { return syndrome_; }

    bool noError() const { return (syndrome_ == 0); }

    virtual bool isDoubleBitError() const = 0;

    virtual bool isSingleBitError() const = 0;

    virtual bool isDataBitError() const = 0;

    // Can only be called on data bit error, else exception.
    virtual uint32_t getDataBit() const = 0;

    virtual bool isCheckBitError() const = 0;

    // Can only be called on check bit error, else exception.
    virtual uint32_t getCheckBit() const = 0;

    virtual bool isMultipleBitError() const = 0;

    bool isUncorrectableError() const 
    {
      return isDoubleBitError() || isMultipleBitError();
    }


    // Used to calculate the most significant bit of a syndrome
    // as the parity of the data and check bits.  Returns the
    // completed syndrome.
    static uint32_t maskedSyndrome(uint32_t syndrome, uint64_t data,
				     uint32_t ecc, uint32_t MSBShift) 
    {
      syndrome %= (1<<MSBShift);
      uint32_t parity = BL_BitUtility::calc_parity(data ^ ecc);
      return syndrome | (parity<<MSBShift);
    }

  protected:
    uint32_t syndrome_;
};

#endif