92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
/******************************************************************************/
|
|
/* Mednafen Sega Saturn Emulation Module */
|
|
/******************************************************************************/
|
|
/* backup.cpp - Backup memory(512KiB) 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 "backup.h"
|
|
|
|
namespace MDFN_IEN_SS
|
|
{
|
|
|
|
static uint8 *ExtBackupRAM;
|
|
static bool ExtBackupRAM_Dirty;
|
|
|
|
// TODO: Check mirroring.
|
|
template <typename T, bool IsWrite>
|
|
static MDFN_HOT void ExtBackupRAM_RW_DB(uint32 A, uint16 *DB)
|
|
{
|
|
uint8 *const ptr = ExtBackupRAM + ((A >> 1) & 0x7FFFF);
|
|
|
|
if (IsWrite)
|
|
{
|
|
if (A & 1)
|
|
{
|
|
ExtBackupRAM_Dirty = true;
|
|
*ptr = *DB;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
*DB = (*ptr << 0) | 0xFF00;
|
|
|
|
if ((A & ~1) == 0x04FFFFFE)
|
|
*DB = 0x21;
|
|
}
|
|
}
|
|
|
|
static MDFN_COLD bool GetClearNVDirty(void)
|
|
{
|
|
bool ret = ExtBackupRAM_Dirty;
|
|
|
|
ExtBackupRAM_Dirty = false;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static MDFN_COLD void GetNVInfo(const char **ext, void **nv_ptr, uint64 *nv_size)
|
|
{
|
|
*ext = "bcr";
|
|
*nv_ptr = ExtBackupRAM;
|
|
*nv_size = 524288;
|
|
}
|
|
|
|
void CART_Backup_Init(CartInfo *c)
|
|
{
|
|
static const uint8 init[0x10] = {0x42, 0x61, 0x63, 0x6B, 0x55, 0x70, 0x52, 0x61, 0x6D, 0x20, 0x46, 0x6F, 0x72, 0x6D, 0x61, 0x74};
|
|
|
|
ExtBackupRAM = (uint8 *)alloc_plain(524288);
|
|
memset(ExtBackupRAM, 0x00, 524288);
|
|
for (unsigned i = 0; i < 0x200; i += 0x10)
|
|
memcpy(ExtBackupRAM + i, init, 0x10);
|
|
|
|
ExtBackupRAM_Dirty = false;
|
|
|
|
c->CS01_SetRW8W16(0x04000000, 0x04FFFFFF,
|
|
ExtBackupRAM_RW_DB<uint16, false>,
|
|
ExtBackupRAM_RW_DB<uint8, true>,
|
|
ExtBackupRAM_RW_DB<uint16, true>);
|
|
|
|
c->GetClearNVDirty = GetClearNVDirty;
|
|
c->GetNVInfo = GetNVInfo;
|
|
|
|
AddMemoryDomain("Backup Cart", ExtBackupRAM, 524288, MEMORYAREA_FLAGS_WRITABLE | MEMORYAREA_FLAGS_SAVERAMMABLE | MEMORYAREA_FLAGS_YUGEENDIAN | MEMORYAREA_FLAGS_WORDSIZE2);
|
|
}
|
|
}
|