RomBlocks.hh

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#ifndef ROMBLOCKS_HH
#define ROMBLOCKS_HH
 
#include "MSXRom.hh"
#include "RomBlockDebuggable.hh"
#include "serialize_meta.hh"
#include <array>
 
namespace openmsx {
 
class SRAM;
 
template<unsigned BANK_SIZE_>
class RomBlocks : public MSXRom
{
public:
        static constexpr unsigned BANK_SIZE = BANK_SIZE_;
        static constexpr unsigned NUM_BANKS = 0x10000 / BANK_SIZE;
        static constexpr unsigned BANK_MASK = BANK_SIZE - 1;
 
        [[nodiscard]] unsigned getBaseSizeAlignment() const override;
        [[nodiscard]] byte readMem(word address, EmuTime::param time) override;
        [[nodiscard]] byte peekMem(word address, EmuTime::param time) const override;
        [[nodiscard]] const byte* getReadCacheLine(word address) const override;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
protected:
        RomBlocks(const DeviceConfig& config, Rom&& rom,
                  unsigned debugBankSizeShift = 0);
        ~RomBlocks() override;
 
        void setUnmapped(byte region);
 
        void setBank(byte region, const byte* adr, byte block);
 
        void setRom(byte region, unsigned block);
 
        void setBlockMask(int mask) { blockMask = mask; }
 
        void setExtraMemory(std::span<const byte> mem);
 
protected:
        std::array<const byte*, NUM_BANKS> bankPtr;
        std::unique_ptr<SRAM> sram; // can be nullptr
        std::array<byte, NUM_BANKS> blockNr;
 
private:
        RomBlockDebuggable romBlockDebug;
        std::span<const byte> extraMem;
        /*const*/ unsigned nrBlocks;
        int blockMask;
};
 
using Rom4kBBlocks  = RomBlocks<0x1000>;
using Rom8kBBlocks  = RomBlocks<0x2000>;
using Rom16kBBlocks = RomBlocks<0x4000>;
 
REGISTER_BASE_CLASS(Rom4kBBlocks,  "Rom4kBBlocks");
REGISTER_BASE_CLASS(Rom8kBBlocks,  "Rom8kBBlocks");
REGISTER_BASE_CLASS(Rom16kBBlocks, "Rom16kBBlocks");
 
// TODO see comment in .cc
//SERIALIZE_CLASS_VERSION(Rom4kBBlocks,  2);
//SERIALIZE_CLASS_VERSION(Rom8kBBlocks,  2);
//SERIALIZE_CLASS_VERSION(Rom16kBBlocks, 2);
 
} // namespace openmsx
 
#endif