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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 "RomOnlyMemoryRule.h"
#include "Video.h"
#include "Memory.h"
#include "Processor.h"
#include "Input.h"
#include "Cartridge.h"
RomOnlyMemoryRule::RomOnlyMemoryRule(Processor* pProcessor,
Memory* pMemory, Video* pVideo, Input* pInput,
Cartridge* pCartridge, Audio* pAudio) : MemoryRule(pProcessor,
pMemory, pVideo, pInput, pCartridge, pAudio)
{
Reset(false);
}
RomOnlyMemoryRule::~RomOnlyMemoryRule()
{
}
void RomOnlyMemoryRule::Reset(bool bCGB)
{
m_bCGB = bCGB;
}
u8 RomOnlyMemoryRule::PerformRead(u16 address)
{
if (address >= 0xA000 && address < 0xC000)
{
if (m_pCartridge->GetRAMSize() > 0)
return m_pMemory->Retrieve(address);
else
{
Log("--> ** Attempting to read from RAM without ram in cart %X", address);
return 0xFF;
}
}
else
return m_pMemory->Retrieve(address);
}
void RomOnlyMemoryRule::PerformWrite(u16 address, u8 value)
{
if (address < 0x8000)
{
// ROM
Log("--> ** Attempting to write on ROM address %X %X", address, value);
}
else if (address >= 0xA000 && address < 0xC000)
{
if (m_pCartridge->GetRAMSize() > 0)
{
m_pMemory->Load(address, value);
}
else
{
Log("--> ** Attempting to write to RAM without ram in cart %X %X", address, value);
}
}
else
m_pMemory->Load(address, value);
}
void RomOnlyMemoryRule::SaveRam(std::ostream &file)
{
Log("RomOnlyMemoryRule save RAM...");
for (int i = 0xA000; i < 0xC000; i++)
{
u8 ram_byte = m_pMemory->Retrieve(i);
file.write(reinterpret_cast<const char*> (&ram_byte), 1);
}
Log("RomOnlyMemoryRule save RAM done");
}
bool RomOnlyMemoryRule::LoadRam(std::istream &file, s32 fileSize)
{
Log("RomOnlyMemoryRule load RAM...");
if ((fileSize > 0) && (fileSize != 0x2000))
{
Log("RomOnlyMemoryRule incorrect size. Expected: %d Found: %d", 0x2000, fileSize);
return false;
}
for (int i = 0xA000; i < 0xC000; i++)
{
u8 ram_byte = 0;
file.read(reinterpret_cast<char*> (&ram_byte), 1);
m_pMemory->Load(i, ram_byte);
}
Log("RomOnlyMemoryRule load RAM done");
return true;
}
size_t RomOnlyMemoryRule::GetRamSize()
{
return m_pCartridge->GetRAMBankCount() * 0x2000;
}
u8* RomOnlyMemoryRule::GetRamBanks()
{
return m_pMemory->GetMemoryMap() + 0xA000;
}
u8* RomOnlyMemoryRule::GetCurrentRamBank()
{
return m_pMemory->GetMemoryMap() + 0xA000;
}
int RomOnlyMemoryRule::GetCurrentRamBankIndex()
{
return 0;
}
u8* RomOnlyMemoryRule::GetCurrentRomBank1()
{
return m_pMemory->GetMemoryMap() + 0x4000;
}
int RomOnlyMemoryRule::GetCurrentRomBank1Index()
{
return 1;
}
u8* RomOnlyMemoryRule::GetRomBank0()
{
return m_pMemory->GetMemoryMap() + 0x0000;
}
int RomOnlyMemoryRule::GetCurrentRomBank0Index()
{
return 0;
}
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