RomDRAM.cc

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#include "RomDRAM.hh"
#include "PanasonicMemory.hh"
#include "MSXMotherBoard.hh"
#include "XMLElement.hh"
#include "serialize.hh"
 
namespace openmsx {
 
[[nodiscard]] static unsigned calcBaseAddr(const DeviceConfig& config)
{
        int base = config.getChild("mem").getAttributeValueAsInt("base", 0);
        int first = config.getChild("rom").getChildDataAsInt("firstblock", 0);
        return first * 0x2000 - base;
}
 
RomDRAM::RomDRAM(const DeviceConfig& config, Rom&& rom_)
        : MSXRom(config, std::move(rom_))
        , panasonicMemory(getMotherBoard().getPanasonicMemory())
        , baseAddr(calcBaseAddr(config))
{
        // ignore result, only called to trigger 'missing rom' error early
        (void)panasonicMemory.getRomBlock(baseAddr);
}
 
byte RomDRAM::readMem(word address, EmuTime::param /*time*/)
{
        return *RomDRAM::getReadCacheLine(address);
}
 
const byte* RomDRAM::getReadCacheLine(word address) const
{
        unsigned addr = address + baseAddr;
        return &panasonicMemory.getRomBlock(addr >> 13)[addr & 0x1FFF];
}
 
REGISTER_MSXDEVICE(RomDRAM, "RomDRAM");
 
} // namespace openmsx