Added submodule filesHEADmaster

1 files changed, 245 insertions, 0 deletions

diff --git a/gearboy/src/MBC2MemoryRule.cpp b/gearboy/src/MBC2MemoryRule.cpp
new file mode 100644
index 00000000..e3d2c04d
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+++ b/gearboy/src/MBC2MemoryRule.cpp
@@ -0,0 +1,245 @@
+/*
+ * 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));
+}