// Copyright (c) 1995 - 2026 kio@little-bat.de
// BSD-2-Clause license
// https://opensource.org/licenses/BSD-2-Clause

#include "MmuZxsp.h"
#include "Machine.h"
#include "Ula/UlaZxsp.h"
#include "Z80/Z80.h"


namespace zxsp
{

/*	creator for use by derived classes:
	for models with mmu
*/
MmuZxsp::MmuZxsp(Machine* m, isa_id id, cstr o_addr, cstr i_addr) : Mmu(m, id, o_addr, i_addr)
{
	xlogIn("new MmuZxsp");
}


/*	creator for Zxsp mmu:
	for models without mmu
*/
MmuZxsp::MmuZxsp(Machine* m) : Mmu(m, isa_MmuZxsp, 0, 0) { xlogIn("new MmuZxsp"); }


MmuZxsp::~MmuZxsp() { xlogIn("~MmuZxsp"); }


void MmuZxsp::powerOn(int32 cc)
{
	Mmu::powerOn(cc);
	mapMem();
}

void MmuZxsp::mapMem()
{
	assert(ram.count() == 16 kB || ram.count() == 48 kB);
	assert(rom.count() == 16 kB || (rom.count() == 24 kB && this->isA(isa_MmuTc2068)));
	assert(ula && cpu);
	assert(ula->isA(isa_UlaZxsp));

	if (!romdis_in) cpu->mapRom(0x0000, 0x4000, &rom[0], nullptr, 0);

	cpu->mapRam(0x4000, 0x4000, &ram[0x0000], ula_zxsp->getWaitmap(), ula_zxsp->getWaitmapSize());

	// Note: Das Ausblenden von Ram hier kann Probleme bereiten.
	// Cheetah32K erweitert aber machine.ram so dass das hier geht.
	// Um es sauber zu machen, müsste man aber wohl in machine.init erst mal allen Speicher unmappen.

	if (ram.count() > 0x4000) cpu->mapRam(0x8000, 0x4000, &ram[0x4000], nullptr, 0);
	else cpu->unmapRam(0x8000, 0x4000);

	if (ram.count() > 0x8000) cpu->mapRam(0xC000, 0x4000, &ram[0x8000], nullptr, 0);
	else cpu->unmapRam(0xC000, 0x4000);

	//	UlaZxspPtr(ula)->setVideoRam(ram.Data());	Stört sich mit SPECTRA interface. Sollte hier eh überflüssig sein,
	// da die Ula ja auch ein init() kriegt.
}


/*	ROMCS Eingang wurde aktiviert/deaktiviert
	MMU.ROMCS handles paging of internal ROM.
	=> no need to forward it's own ROMCS state as well.

	In general items should not actively unmap their memory as result of incoming ROMCS.
	Instead they should trust that the sender will map it's rom into the Z80's memory space.
	While their backside ROMCS is active, items must not page in their memory, just store values written to their
   registers only.

	f=1 -> disable internal rom
*/
void MmuZxsp::romCS(bool f)
{
	if (f == romdis_in) return; // no change
	romdis_in = f;
	if (f) return;

	cpu->mapRom(0x0000, 0x4000, &rom[0], nullptr, 0);
}

} // namespace zxsp