Added submodule filesHEADmaster

1 files changed, 457 insertions, 0 deletions

diff --git a/gearboy/src/MBC3MemoryRule.cpp b/gearboy/src/MBC3MemoryRule.cpp
new file mode 100644
index 00000000..49d1f789
--- /dev/null
+++ b/gearboy/src/MBC3MemoryRule.cpp
@@ -0,0 +1,457 @@
+/*
+ * 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 "MBC3MemoryRule.h"
+#include "Video.h"
+#include "Memory.h"
+#include "Processor.h"
+#include "Input.h"
+#include "Cartridge.h"
+
+MBC3MemoryRule::MBC3MemoryRule(Processor* pProcessor,
+        Memory* pMemory, Video* pVideo, Input* pInput,
+        Cartridge* pCartridge, Audio* pAudio) : MemoryRule(pProcessor,
+pMemory, pVideo, pInput, pCartridge, pAudio)
+{
+    m_pRAMBanks = new u8[0x8000];
+    Reset(false);
+}
+
+MBC3MemoryRule::~MBC3MemoryRule()
+{
+    SafeDeleteArray(m_pRAMBanks);
+}
+
+void MBC3MemoryRule::Reset(bool bCGB)
+{
+    m_bCGB = bCGB;
+    m_iCurrentRAMBank = 0;
+    m_iCurrentROMBank = 1;
+    m_bRamEnabled = false;
+    m_bRTCEnabled = false;
+    for (int i = 0; i < 0x8000; i++)
+        m_pRAMBanks[i] = 0xFF;
+    m_RTC.Seconds = 0;
+    m_RTC.Minutes = 0;
+    m_RTC.Hours = 0;
+    m_RTC.Days = 0;
+    m_RTC.Control = 0;
+    m_RTC.LatchedSeconds = 0;
+    m_RTC.LatchedMinutes = 0;
+    m_RTC.LatchedHours = 0;
+    m_RTC.LatchedDays = 0;
+    m_RTC.LatchedControl = 0;
+    m_RTC.LastTime = static_cast<s32>(m_pCartridge->GetCurrentRTC());
+    m_RTC.padding = 0;
+    m_iRTCLatch = 0;
+    m_RTCRegister = 0;
+    m_RTCLastTimeCache = m_RTC.LastTime;
+    m_CurrentROMAddress = 0x4000;
+    m_CurrentRAMAddress = 0;
+}
+
+u8 MBC3MemoryRule::PerformRead(u16 address)
+{
+    switch (address & 0xE000)
+    {
+        case 0x4000:
+        case 0x6000:
+        {
+            u8* pROM = m_pCartridge->GetTheROM();
+            return pROM[(address - 0x4000) + m_CurrentROMAddress];
+        }
+        case 0xA000:
+        {
+            if (m_iCurrentRAMBank >= 0)
+            {
+                if (m_bRamEnabled)
+                {
+                    return m_pRAMBanks[(address - 0xA000) + m_CurrentRAMAddress];
+                }
+                else
+                {
+                    Log("--> ** Attempting to read from disabled ram %X", address);
+                    return 0xFF;
+                }
+            }
+            else if (m_pCartridge->IsRTCPresent() && m_bRTCEnabled)
+            {
+                switch (m_RTCRegister)
+                {
+                    case 0x08:
+                        return m_RTC.LatchedSeconds;
+                        break;
+                    case 0x09:
+                        return m_RTC.LatchedMinutes;
+                        break;
+                    case 0x0A:
+                        return m_RTC.LatchedHours;
+                        break;
+                    case 0x0B:
+                        return m_RTC.LatchedDays;
+                        break;
+                    case 0x0C:
+                        return m_RTC.LatchedControl;
+                        break;
+                    default:
+                        return 0xFF;
+                }
+            }
+            else
+            {
+                Log("--> ** Attempting to read from disabled RTC %X", address);
+                return 0xFF;
+            }
+        }
+        default:
+        {
+            return m_pMemory->Retrieve(address);
+        }
+    }
+}
+
+void MBC3MemoryRule::PerformWrite(u16 address, u8 value)
+{
+    switch (address & 0xE000)
+    {
+        case 0x0000:
+        {
+            if (m_pCartridge->GetRAMSize() > 0)
+            {
+                bool previous = m_bRamEnabled;
+                m_bRamEnabled = ((value & 0x0F) == 0x0A);
+
+                if (IsValidPointer(m_pRamChangedCallback) && previous && !m_bRamEnabled)
+                {
+                    (*m_pRamChangedCallback)();
+                }
+            }
+            m_bRTCEnabled = ((value & 0x0F) == 0x0A);
+            break;
+        }
+        case 0x2000:
+        {
+            m_iCurrentROMBank = value & 0x7F;
+            if (m_iCurrentROMBank == 0)
+                m_iCurrentROMBank = 1;
+            m_iCurrentROMBank &= (m_pCartridge->GetROMBankCount() - 1);
+            m_CurrentROMAddress = m_iCurrentROMBank * 0x4000;
+            break;
+        }
+        case 0x4000:
+        {
+            if ((value >= 0x08) && (value <= 0x0C))
+            {
+                // RTC
+                if (m_pCartridge->IsRTCPresent() && m_bRTCEnabled)
+                {
+                    m_RTCRegister = value;
+                    m_iCurrentRAMBank = -1;
+                }
+                else
+                {
+                    Log("--> ** Attempting to select RTC register when RTC is disabled or not present %X %X", address, value);
+                }
+            }
+            else if (value <= 0x03)
+            {
+                m_iCurrentRAMBank = value;
+                m_iCurrentRAMBank &= (m_pCartridge->GetRAMBankCount() - 1);
+                m_CurrentRAMAddress = m_iCurrentRAMBank * 0x2000;
+            }
+            else
+            {
+                Log("--> ** Attempting to select unkwon register %X %X", address, value);
+            }
+            break;
+        }
+        case 0x6000:
+        {
+            if (m_pCartridge->IsRTCPresent())
+            {
+                // RTC Latch
+                if ((m_iRTCLatch == 0x00) && (value == 0x01))
+                {
+                    UpdateRTC();
+                    m_RTC.LatchedSeconds = m_RTC.Seconds;
+                    m_RTC.LatchedMinutes = m_RTC.Minutes;
+                    m_RTC.LatchedHours = m_RTC.Hours;
+                    m_RTC.LatchedDays = m_RTC.Days;
+                    m_RTC.LatchedControl = m_RTC.Control;
+                }
+
+                m_iRTCLatch = value;
+            }
+            break;
+        }
+        case 0xA000:
+        {
+            if (m_iCurrentRAMBank >= 0)
+            {
+                if (m_bRamEnabled)
+                {
+                    m_pRAMBanks[(address - 0xA000) + m_CurrentRAMAddress] = value;
+                }
+                else
+                {
+                    Log("--> ** Attempting to write on RAM when ram is disabled %X %X", address, value);
+                }
+            }
+            else if (m_pCartridge->IsRTCPresent() && m_bRTCEnabled)
+            {
+                switch (m_RTCRegister)
+                {
+                    case 0x08:
+                        m_RTC.Seconds = value;
+                        break;
+                    case 0x09:
+                        m_RTC.Minutes = value;
+                        break;
+                    case 0x0A:
+                        m_RTC.Hours = value;
+                        break;
+                    case 0x0B:
+                        m_RTC.Days = value;
+                        break;
+                    case 0x0C:
+                        m_RTC.Control = (m_RTC.Control & 0x80) | (value & 0xC1);
+                        break;
+                }
+            }
+            else
+            {
+                Log("--> ** Attempting to write on RTC when RTC is disabled or not present %X %X", address, value);
+            }
+            break;
+        }
+        default:
+        {
+            m_pMemory->Load(address, value);
+            break;
+        }
+    }
+}
+
+void MBC3MemoryRule::UpdateRTC()
+{
+    s32 now = static_cast<s32>(m_pCartridge->GetCurrentRTC());
+
+    if (!IsSetBit(m_RTC.Control, 6) && (m_RTCLastTimeCache != now))
+    {
+        m_RTCLastTimeCache = now;
+        s32 difference = now - m_RTC.LastTime;
+        m_RTC.LastTime = now;
+
+        if (difference > 0)
+        {
+            m_RTC.Seconds += (s32) (difference % 60);
+
+            if (m_RTC.Seconds > 59)
+            {
+                m_RTC.Seconds -= 60;
+                m_RTC.Minutes++;
+            }
+
+            difference /= 60;
+            m_RTC.Minutes += (s32) (difference % 60);
+
+            if (m_RTC.Minutes > 59)
+            {
+                m_RTC.Minutes -= 60;
+                m_RTC.Hours++;
+            }
+
+            difference /= 60;
+            m_RTC.Hours += (s32) (difference % 24);
+
+            if (m_RTC.Hours > 23)
+            {
+                m_RTC.Hours -= 24;
+                m_RTC.Days++;
+            }
+
+            difference /= 24;
+            m_RTC.Days += (s32) (difference & 0xffffffff);
+
+            if (m_RTC.Days > 0xFF)
+            {
+                m_RTC.Control = (m_RTC.Control & 0xC1) | 0x01;
+
+                if (m_RTC.Days > 511)
+                {
+                    m_RTC.Days %= 512;
+                    m_RTC.Control |= 0x80;
+                    m_RTC.Control &= 0xC0;
+                }
+            }
+        }
+    }
+}
+
+void MBC3MemoryRule::SaveRam(std::ostream & file)
+{
+    Log("MBC3MemoryRule save RAM...");
+
+    for (int i = 0; i < 0x8000; i++)
+    {
+        u8 ram_byte = m_pRAMBanks[i];
+        file.write(reinterpret_cast<const char*> (&ram_byte), 1);
+    }
+
+    if (m_pCartridge->IsRTCPresent())
+    {
+        file.write(reinterpret_cast<const char*> (&m_RTC), sizeof(m_RTC));
+    }
+
+    Log("MBC3MemoryRule save RAM done");
+}
+
+bool MBC3MemoryRule::LoadRam(std::istream & file, s32 fileSize)
+{
+    Log("MBC3MemoryRule load RAM...");
+
+    bool loadRTC = m_pCartridge->IsRTCPresent();
+
+    if (fileSize > 0)
+    {
+        if (fileSize < 0x8000)
+        {
+            Log("MBC3MemoryRule incorrect RAM size. Expected: %d Found: %d", 0x8000, fileSize);
+            return false;
+        }
+
+        if (loadRTC)
+        {
+            s32 minExpectedSize = 0x8000 + 44;
+            s32 maxExpectedSize = 0x8000 + 48;
+
+            if ((fileSize != minExpectedSize) && (fileSize != maxExpectedSize))
+            {
+                Log("MBC3MemoryRule incorrect RTC size. MinExpected: %d MaxExpected: %d Found: %d", minExpectedSize, maxExpectedSize, fileSize);
+            }
+
+            if (fileSize < minExpectedSize)
+            {
+                Log("MBC3MemoryRule ignoring RTC data");
+                loadRTC = false;
+            }
+        }
+    }
+
+    for (int i = 0; i < 0x8000; i++)
+    {
+        u8 ram_byte = 0;
+        file.read(reinterpret_cast<char*> (&ram_byte), 1);
+        m_pRAMBanks[i] = ram_byte;
+    }
+
+    if (loadRTC)
+    {
+        file.read(reinterpret_cast<char*> (&m_RTC), 44);
+    }
+
+    Log("MBC3MemoryRule load RAM done");
+
+    return true;
+}
+
+size_t MBC3MemoryRule::GetRamSize()
+{
+    return 0x8000;
+}
+
+size_t MBC3MemoryRule::GetRTCSize()
+{
+    return m_pCartridge->IsRTCPresent() ? sizeof(m_RTC) : 0;
+}
+
+u8* MBC3MemoryRule::GetRamBanks()
+{
+    return m_pRAMBanks;
+}
+
+u8* MBC3MemoryRule::GetCurrentRamBank()
+{
+    return m_pRAMBanks + m_CurrentRAMAddress;
+}
+
+int MBC3MemoryRule::GetCurrentRamBankIndex()
+{
+    return m_iCurrentRAMBank > 0 ? m_iCurrentRAMBank : 0;
+}
+
+u8* MBC3MemoryRule::GetRomBank0()
+{
+    return m_pMemory->GetMemoryMap() + 0x0000;
+}
+
+int MBC3MemoryRule::GetCurrentRomBank0Index()
+{
+    return 0;
+}
+
+u8* MBC3MemoryRule::GetCurrentRomBank1()
+{
+    u8* pROM = m_pCartridge->GetTheROM();
+    return &pROM[m_CurrentROMAddress];
+}
+
+int MBC3MemoryRule::GetCurrentRomBank1Index()
+{
+    return m_iCurrentROMBank;
+}
+
+u8* MBC3MemoryRule::GetRTCMemory()
+{
+    return m_pCartridge->IsRTCPresent() ? reinterpret_cast<u8*>(&m_RTC) : NULL;
+}
+
+void MBC3MemoryRule::SaveState(std::ostream& stream)
+{
+    using namespace std;
+
+    stream.write(reinterpret_cast<const char*> (&m_iCurrentRAMBank), sizeof(m_iCurrentRAMBank));
+    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_bRTCEnabled), sizeof(m_bRTCEnabled));
+    stream.write(reinterpret_cast<const char*> (m_pRAMBanks), 0x8000);
+    stream.write(reinterpret_cast<const char*> (&m_iRTCLatch), sizeof(m_iRTCLatch));
+    stream.write(reinterpret_cast<const char*> (&m_RTCRegister), sizeof(m_RTCRegister));
+    stream.write(reinterpret_cast<const char*> (&m_RTCLastTimeCache), sizeof(m_RTCLastTimeCache));
+    stream.write(reinterpret_cast<const char*> (&m_CurrentROMAddress), sizeof(m_CurrentROMAddress));
+    stream.write(reinterpret_cast<const char*> (&m_CurrentRAMAddress), sizeof(m_CurrentRAMAddress));
+    stream.write(reinterpret_cast<const char*> (&m_RTC), sizeof(m_RTC));
+}
+
+void MBC3MemoryRule::LoadState(std::istream& stream)
+{
+    using namespace std;
+
+    stream.read(reinterpret_cast<char*> (&m_iCurrentRAMBank), sizeof(m_iCurrentRAMBank));
+    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_bRTCEnabled), sizeof(m_bRTCEnabled));
+    stream.read(reinterpret_cast<char*> (m_pRAMBanks), 0x8000);
+    stream.read(reinterpret_cast<char*> (&m_iRTCLatch), sizeof(m_iRTCLatch));
+    stream.read(reinterpret_cast<char*> (&m_RTCRegister), sizeof(m_RTCRegister));
+    stream.read(reinterpret_cast<char*> (&m_RTCLastTimeCache), sizeof(m_RTCLastTimeCache));
+    stream.read(reinterpret_cast<char*> (&m_CurrentROMAddress), sizeof(m_CurrentROMAddress));
+    stream.read(reinterpret_cast<char*> (&m_CurrentRAMAddress), sizeof(m_CurrentRAMAddress));
+    stream.read(reinterpret_cast<char*> (&m_RTC), sizeof(m_RTC));
+}