/******************************************************************************/
/* Mednafen Sega Saturn Emulation Module                                      */
/******************************************************************************/
/* cs1ram.cpp - CS1 RAM(16MiB) cart emulation
**  Copyright (C) 2017 Mednafen Team
**
** 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.,
** 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include "common.h"
#include "cs1ram.h"

namespace MDFN_IEN_SS
{
static uint16 *CS1RAM = nullptr;

template <typename T, bool IsWrite>
static MDFN_HOT void CS1RAM_RW_DB(uint32 A, uint16 *DB)
{
	const uint32 mask = (sizeof(T) == 2) ? 0xFFFF : (0xFF << (((A & 1) ^ 1) << 3));
	uint16 *const ptr = (uint16 *)((uint8 *)CS1RAM + (A & 0x00FFFFFE));

	if (IsWrite)
		*ptr = (*ptr & ~mask) | (*DB & mask);
	else
		*DB = *ptr;
}

static MDFN_COLD void Reset(bool powering_up)
{
	if (powering_up)
		memset(CS1RAM, 0, 0x1000000);
}

void CART_CS1RAM_Init(CartInfo *c)
{
	CS1RAM = (uint16 *)alloc_plain(0x1000000);

	SS_SetPhysMemMap(0x04000000, 0x04FFFFFF, CS1RAM, 0x1000000, true);
	c->CS01_SetRW8W16(0x04000000, 0x04FFFFFF,
					  CS1RAM_RW_DB<uint16, false>,
					  CS1RAM_RW_DB<uint8, true>,
					  CS1RAM_RW_DB<uint16, true>);

	c->Reset = Reset;
	AddMemoryDomain("CS1 Cart", CS1RAM, 0x1000000, MEMORYAREA_FLAGS_WRITABLE | MEMORYAREA_FLAGS_YUGEENDIAN | MEMORYAREA_FLAGS_WORDSIZE2);
}
}