#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(uint16_t address, EmuTime /*time*/)

{

	return *RomDRAM::getReadCacheLine(address);

}

const byte* RomDRAM::getReadCacheLine(uint16_t address) const

{

	unsigned addr = address + baseAddr;

	return &panasonicMemory.getRomBlock(addr >> 13)[addr & 0x1FFF];

}

REGISTER_MSXDEVICE(RomDRAM, "RomDRAM");

} // namespace openmsx