BizHawk/waterbox/ss/cart/rom.cpp

/******************************************************************************/
/* Mednafen Sega Saturn Emulation Module                                      */
/******************************************************************************/
/* rom.cpp - ROM cart emulation
**  Copyright (C) 2016-2017 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 "rom.h"

namespace MDFN_IEN_SS
{

static uint16 *ROM; //[0x100000];

static MDFN_HOT void ROM_Read(uint32 A, uint16 *DB)
{
	// TODO: Check mirroring.
	//printf("ROM: %08x\n", A);
	*DB = *(uint16 *)((uint8 *)ROM + (A & 0x1FFFFE));
}

void CART_ROM_Init(CartInfo *c, const char *filename)
{
	if (FirmwareSizeCallback(filename) != 0x200000)
		abort();
	ROM = (uint16 *)alloc_sealed(0x200000);
	FirmwareDataCallback(filename, (uint8 *)ROM);

	for (unsigned i = 0; i < 0x100000; i++)
	{
		ROM[i] = MDFN_de16msb<true>(&ROM[i]);
	}

	SS_SetPhysMemMap(0x02000000, 0x03FFFFFF, ROM, 0x200000, false);
	c->CS01_SetRW8W16(0x02000000, 0x03FFFFFF, ROM_Read);
	AddMemoryDomain("Rom Cart", ROM, 0x200000, MEMORYAREA_FLAGS_YUGEENDIAN | MEMORYAREA_FLAGS_WORDSIZE2);
}
}