memman.h

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/***************************************************************************
 *   Copyright (C) by Fred Klaus                                           *
 *       development@fkweb.de                                              *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This 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 program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#ifndef CPC_MEMMAN_H
#define CPC_MEMMAN_H

#include "def.h"
#include "gatearray.h"
#include "z80.h"

namespace cpcx
{

    class MemMan final
    {

    public:
        MemMan(Z80* z80 = nullptr, GateArray* gatearray = nullptr,
                const tSTRING & cpcrom = "", const tSTRING & amsdos = "");
        ~MemMan() ROLAND_DEFAULT

        enum RamSize : tUWORD {ram64=64, ram128=128, ram256=256, ram512=512};

        enum Error   : tUBYTE {ErrRamSize=1, ErrMemory=2, ErrCpcRom=4, ErrAmsdos=8};

        int init(tUWORD ramsize = 128, const tSTRING & cpcrom = "", const tSTRING & amsdos = "");
        int init(Z80* z80, GateArray* gatearray);

        inline void initBanking();
        void memoryManager();

        inline void toggleLowerRom();
        inline void toggleUpperRom();

        tUBYTE* memBankConfig(tUBYTE bank, tUBYTE seg) {return mMemBankConfig[bank][seg];}
        tUBYTE* rom(int bank) {return mRom[bank];}

        tUBYTE* upperRom() {return mUpperRom;}
        tUBYTE* lowerRom() {return mLowerRom;}

        tUBYTE* base() {return mMemBankConfig[0][0];}

        bool openRom(int idx, const tSTRING & filename);
        bool openCpcRom(const tSTRING & filename);

    private:
        GateArray* mGateArray;
        Z80* mZ80;

        tUBYTE* mRam;
        tUBYTE* mRom[256];
        tUBYTE  mCpcRom[2*16384];
        tUBYTE* mMemBankConfig[8][4];

        tUBYTE* mUpperRom;
        tUBYTE* mLowerRom;

        int mRamSize;

    };

    inline void MemMan::toggleUpperRom()
    {

        if (!(mGateArray->romConfig() & 0x08))
        {
            if ((mGateArray->upperRom() == 0) || (mRom[mGateArray->upperRom()] == 0))
            {
                mZ80->setMembank_read(3, mUpperRom);
            }
            else
            {
                mZ80->setMembank_read(3, mRom[mGateArray->upperRom()]);
            }
        }
    }

    inline void MemMan::toggleLowerRom()
    {
        if (!(mGateArray->romConfig() & 0x04))
        {
            mZ80->setMembank_read(0, mLowerRom);
        }
    }

} // cpc

#endif // CPC_MEMMAN_H