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/*
* Gearboy - Nintendo Game Boy Emulator
* Copyright (C) 2012 Ignacio Sanchez
* 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 3 of the License, or
* 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, see http://www.gnu.org/licenses/
*
*/
#include "MBC2MemoryRule.h"
#include "Video.h"
#include "Memory.h"
#include "Processor.h"
#include "Input.h"
#include "Cartridge.h"
MBC2MemoryRule::MBC2MemoryRule(Processor* pProcessor,
Memory* pMemory, Video* pVideo, Input* pInput,
Cartridge* pCartridge, Audio* pAudio) : MemoryRule(pProcessor,
pMemory, pVideo, pInput, pCartridge, pAudio)
{
Reset(false);
}
MBC2MemoryRule::~MBC2MemoryRule()
{
}
void MBC2MemoryRule::Reset(bool bCGB)
{
m_bCGB = bCGB;
m_iCurrentROMBank = 1;
m_CurrentROMAddress = 0x4000;
m_bRamEnabled = false;
}
u8 MBC2MemoryRule::PerformRead(u16 address)
{
switch (address & 0xE000)
{
case 0x4000:
case 0x6000:
{
u8* pROM = m_pCartridge->GetTheROM();
return pROM[(address - 0x4000) + m_CurrentROMAddress];
}
case 0xA000:
{
if (address < 0xA200)
{
if (m_bRamEnabled)
return m_pMemory->Retrieve(address);
else
{
Log("--> ** Attempting to read from disabled ram %X", address);
return 0xFF;
}
}
else
{
Log("--> ** Attempting to read from ivalid RAM %X", address);
return 0x00;
}
}
default:
{
return m_pMemory->Retrieve(address);
}
}
}
void MBC2MemoryRule::PerformWrite(u16 address, u8 value)
{
switch (address & 0xE000)
{
case 0x0000:
{
if (!(address & 0x0100))
{
bool previous = m_bRamEnabled;
m_bRamEnabled = ((value & 0x0F) == 0x0A);
if (IsValidPointer(m_pRamChangedCallback) && previous && !m_bRamEnabled)
{
(*m_pRamChangedCallback)();
}
}
else
{
Log("--> ** Attempting to write on invalid register %X %X", address, value);
}
break;
}
case 0x2000:
{
if (address & 0x0100)
{
m_iCurrentROMBank = value & 0x0F;
if (m_iCurrentROMBank == 0)
m_iCurrentROMBank = 1;
m_iCurrentROMBank &= (m_pCartridge->GetROMBankCount() - 1);
m_CurrentROMAddress = m_iCurrentROMBank * 0x4000;
}
else
{
Log("--> ** Attempting to write on invalid register %X %X", address, value);
}
break;
}
case 0x4000:
case 0x6000:
{
Log("--> ** Attempting to write on invalid address %X %X", address, value);
break;
}
case 0xA000:
{
if (address < 0xA200)
{
if (m_bRamEnabled)
{
m_pMemory->Load(address, value & 0x0F);
}
else
{
Log("--> ** Attempting to write on RAM when ram is disabled %X %X", address, value);
}
}
else
{
Log("--> ** Attempting to write on invalid RAM %X %X", address, value);
}
break;
}
default:
{
m_pMemory->Load(address, value);
break;
}
}
}
void MBC2MemoryRule::SaveRam(std::ostream & file)
{
Log("MBC2MemoryRule save RAM...");
for (int i = 0xA000; i < 0xA200; i++)
{
u8 ram_byte = m_pMemory->Retrieve(i);
file.write(reinterpret_cast<const char*> (&ram_byte), 1);
}
Log("MBC2MemoryRule save RAM done");
}
bool MBC2MemoryRule::LoadRam(std::istream & file, s32 fileSize)
{
Log("MBC2MemoryRule load RAM...");
if ((fileSize > 0) && (fileSize != 512))
{
Log("MBC2MemoryRule incorrect size. Expected: 512 Found: %d", fileSize);
return false;
}
for (int i = 0xA000; i < 0xA200; i++)
{
u8 ram_byte = 0;
file.read(reinterpret_cast<char*> (&ram_byte), 1);
m_pMemory->Load(i, ram_byte);
}
Log("MBC2MemoryRule load RAM done");
return true;
}
size_t MBC2MemoryRule::GetRamSize()
{
return 0x200;
}
u8* MBC2MemoryRule::GetRamBanks()
{
return m_pMemory->GetMemoryMap() + 0xA000;
}
u8* MBC2MemoryRule::GetCurrentRamBank()
{
return m_pMemory->GetMemoryMap() + 0xA000;
}
int MBC2MemoryRule::GetCurrentRamBankIndex()
{
return 0;
}
u8* MBC2MemoryRule::GetCurrentRomBank1()
{
u8* pROM = m_pCartridge->GetTheROM();
return &pROM[m_CurrentROMAddress];
}
u8* MBC2MemoryRule::GetRomBank0()
{
return m_pMemory->GetMemoryMap() + 0x0000;
}
int MBC2MemoryRule::GetCurrentRomBank0Index()
{
return 0;
}
int MBC2MemoryRule::GetCurrentRomBank1Index()
{
return m_iCurrentROMBank;
}
void MBC2MemoryRule::SaveState(std::ostream& stream)
{
using namespace std;
stream.write(reinterpret_cast<const char*> (&m_iCurrentROMBank), sizeof(m_iCurrentROMBank));
stream.write(reinterpret_cast<const char*> (&m_bRamEnabled), sizeof(m_bRamEnabled));
stream.write(reinterpret_cast<const char*> (&m_CurrentROMAddress), sizeof(m_CurrentROMAddress));
}
void MBC2MemoryRule::LoadState(std::istream& stream)
{
using namespace std;
stream.read(reinterpret_cast<char*> (&m_iCurrentROMBank), sizeof(m_iCurrentROMBank));
stream.read(reinterpret_cast<char*> (&m_bRamEnabled), sizeof(m_bRamEnabled));
stream.read(reinterpret_cast<char*> (&m_CurrentROMAddress), sizeof(m_CurrentROMAddress));
}
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