#include "core/gba/gba.h"

#include <cmath>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>

#ifndef _MSC_VER
#include <strings.h>
#endif

#include "core/base/file_util.h"
#include "core/base/message.h"
#include "core/base/port.h"
#include "core/base/sizes.h"
#include "core/base/system.h"
#include "core/gba/gbaCheats.h"
#include "core/gba/gbaCpu.h"
#include "core/gba/gbaEeprom.h"
#include "core/gba/gbaFlash.h"
#include "core/gba/gbaGlobals.h"
#include "core/gba/gbaGfx.h"
#include "core/gba/gbaInline.h"
#include "core/gba/gbaPrint.h"
#include "core/gba/gbaSound.h"
#include "core/gba/internal/gbaBios.h"
#include "core/gba/internal/gbaEreader.h"
#include "core/gba/internal/gbaSram.h"

#if defined(VBAM_ENABLE_DEBUGGER)
#include "core/gba/gbaElf.h"
#endif  // defined(VBAM_ENABLE_DEBUGGER)

#if !defined(NO_LINK)
#include "core/gba/gbaLink.h"
#endif  // !defined(NOLINK)

#if !defined(__LIBRETRO__)
#include "core/base/image_util.h"
#endif // !__LIBRETRO__

#ifdef PROFILING
#include "prof/prof.h"
#endif

#ifdef __GNUC__
#define _stricmp strcasecmp
#endif

#ifdef _MSC_VER
#define strdup _strdup
#endif

extern int emulating;
bool debugger = false;

int SWITicks = 0;
int IRQTicks = 0;

uint32_t mastercode = 0;
int layerEnableDelay = 0;
bool busPrefetch = false;
bool busPrefetchEnable = false;
uint32_t busPrefetchCount = 0;
int cpuDmaTicksToUpdate = 0;
int cpuDmaCount = 0;
bool cpuDmaRunning = false;
uint32_t cpuDmaLast = 0;
uint32_t cpuDmaPC = 0;
int dummyAddress = 0;

bool cpuBreakLoop = false;
int cpuNextEvent = 0;

bool intState = false;
bool stopState = false;
bool holdState = false;
int holdType = 0;
bool cpuSramEnabled = true;
bool cpuFlashEnabled = true;
bool cpuEEPROMEnabled = true;
bool cpuEEPROMSensorEnabled = false;

uint32_t cpuPrefetch[2];

int cpuTotalTicks = 0;
#ifdef PROFILING
int profilingTicks = 0;
int profilingTicksReload = 0;
static profile_segment* profilSegment = NULL;
#endif

#ifdef VBAM_ENABLE_DEBUGGER
uint8_t freezeWorkRAM[SIZE_WRAM];
uint8_t freezeInternalRAM[SIZE_IRAM];
uint8_t freezeVRAM[0x18000];
uint8_t freezePRAM[SIZE_PRAM];
uint8_t freezeOAM[SIZE_OAM];
bool debugger_last;
#endif

int lcdTicks = (coreOptions.useBios && !coreOptions.skipBios) ? 1008 : 208;
uint8_t timerOnOffDelay = 0;
uint16_t timer0Value = 0;
bool timer0On = false;
int timer0Ticks = 0;
int timer0Reload = 0;
int timer0ClockReload = 0;
uint16_t timer1Value = 0;
bool timer1On = false;
int timer1Ticks = 0;
int timer1Reload = 0;
int timer1ClockReload = 0;
uint16_t timer2Value = 0;
bool timer2On = false;
int timer2Ticks = 0;
int timer2Reload = 0;
int timer2ClockReload = 0;
uint16_t timer3Value = 0;
bool timer3On = false;
int timer3Ticks = 0;
int timer3Reload = 0;
int timer3ClockReload = 0;
uint32_t dma0Source = 0;
uint32_t dma0Dest = 0;
uint32_t dma1Source = 0;
uint32_t dma1Dest = 0;
uint32_t dma2Source = 0;
uint32_t dma2Dest = 0;
uint32_t dma3Source = 0;
uint32_t dma3Dest = 0;
void (*cpuSaveGameFunc)(uint32_t, uint8_t) = flashSaveDecide;
void (*renderLine)() = mode0RenderLine;
bool fxOn = false;
bool windowOn = false;
int frameCount = 0;
char g_buffer[1024];
uint32_t lastTime = 0;
int g_count = 0;

int capture = 0;
int capturePrevious = 0;
int captureNumber = 0;

int armOpcodeCount = 0;
int thumbOpcodeCount = 0;

const int TIMER_TICKS[4] = {
    0,
    6,
    8,
    10
};

const uint32_t objTilesAddress[3] = { 0x010000, 0x014000, 0x014000 };
const uint8_t gamepakRamWaitState[4] = { 4, 3, 2, 8 };
const uint8_t gamepakWaitState[4] = { 4, 3, 2, 8 };
const uint8_t gamepakWaitState0[2] = { 2, 1 };
const uint8_t gamepakWaitState1[2] = { 4, 1 };
const uint8_t gamepakWaitState2[2] = { 8, 1 };

uint8_t memoryWait[16] = { 0, 0, 2, 0, 0, 0, 0, 0, 4, 4, 4, 4, 4, 4, 4, 0 };
uint8_t memoryWait32[16] = { 0, 0, 5, 0, 0, 1, 1, 0, 7, 7, 9, 9, 13, 13, 4, 0 };
uint8_t memoryWaitSeq[16] = { 0, 0, 2, 0, 0, 0, 0, 0, 2, 2, 4, 4, 8, 8, 4, 0 };
uint8_t memoryWaitSeq32[16] = { 0, 0, 5, 0, 0, 1, 1, 0, 5, 5, 9, 9, 17, 17, 4, 0 };

// The videoMemoryWait constants are used to add some waitstates
// if the opcode access video memory data outside of vblank/hblank
// It seems to happen on only one ticks for each pixel.
// Not used for now (too problematic with current code).
//const uint8_t videoMemoryWait[16] =
//  {0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0};

uint8_t biosProtected[4];

#ifdef WORDS_BIGENDIAN
bool cpuBiosSwapped = false;
#endif

uint32_t myROM[] = {
    0xEA000006,
    0xEA000093,
    0xEA000006,
    0x00000000,
    0x00000000,
    0x00000000,
    0xEA000088,
    0x00000000,
    0xE3A00302,
    0xE1A0F000,
    0xE92D5800,
    0xE55EC002,
    0xE28FB03C,
    0xE79BC10C,
    0xE14FB000,
    0xE92D0800,
    0xE20BB080,
    0xE38BB01F,
    0xE129F00B,
    0xE92D4004,
    0xE1A0E00F,
    0xE12FFF1C,
    0xE8BD4004,
    0xE3A0C0D3,
    0xE129F00C,
    0xE8BD0800,
    0xE169F00B,
    0xE8BD5800,
    0xE1B0F00E,
    0x0000009C,
    0x0000009C,
    0x0000009C,
    0x0000009C,
    0x000001F8,
    0x000001F0,
    0x000000AC,
    0x000000A0,
    0x000000FC,
    0x00000168,
    0xE12FFF1E,
    0xE1A03000,
    0xE1A00001,
    0xE1A01003,
    0xE2113102,
    0x42611000,
    0xE033C040,
    0x22600000,
    0xE1B02001,
    0xE15200A0,
    0x91A02082,
    0x3AFFFFFC,
    0xE1500002,
    0xE0A33003,
    0x20400002,
    0xE1320001,
    0x11A020A2,
    0x1AFFFFF9,
    0xE1A01000,
    0xE1A00003,
    0xE1B0C08C,
    0x22600000,
    0x42611000,
    0xE12FFF1E,
    0xE92D0010,
    0xE1A0C000,
    0xE3A01001,
    0xE1500001,
    0x81A000A0,
    0x81A01081,
    0x8AFFFFFB,
    0xE1A0000C,
    0xE1A04001,
    0xE3A03000,
    0xE1A02001,
    0xE15200A0,
    0x91A02082,
    0x3AFFFFFC,
    0xE1500002,
    0xE0A33003,
    0x20400002,
    0xE1320001,
    0x11A020A2,
    0x1AFFFFF9,
    0xE0811003,
    0xE1B010A1,
    0xE1510004,
    0x3AFFFFEE,
    0xE1A00004,
    0xE8BD0010,
    0xE12FFF1E,
    0xE0010090,
    0xE1A01741,
    0xE2611000,
    0xE3A030A9,
    0xE0030391,
    0xE1A03743,
    0xE2833E39,
    0xE0030391,
    0xE1A03743,
    0xE2833C09,
    0xE283301C,
    0xE0030391,
    0xE1A03743,
    0xE2833C0F,
    0xE28330B6,
    0xE0030391,
    0xE1A03743,
    0xE2833C16,
    0xE28330AA,
    0xE0030391,
    0xE1A03743,
    0xE2833A02,
    0xE2833081,
    0xE0030391,
    0xE1A03743,
    0xE2833C36,
    0xE2833051,
    0xE0030391,
    0xE1A03743,
    0xE2833CA2,
    0xE28330F9,
    0xE0000093,
    0xE1A00840,
    0xE12FFF1E,
    0xE3A00001,
    0xE3A01001,
    0xE92D4010,
    0xE3A03000,
    0xE3A04001,
    0xE3500000,
    0x1B000004,
    0xE5CC3301,
    0xEB000002,
    0x0AFFFFFC,
    0xE8BD4010,
    0xE12FFF1E,
    0xE3A0C301,
    0xE5CC3208,
    0xE15C20B8,
    0xE0110002,
    0x10222000,
    0x114C20B8,
    0xE5CC4208,
    0xE12FFF1E,
    0xE92D500F,
    0xE3A00301,
    0xE1A0E00F,
    0xE510F004,
    0xE8BD500F,
    0xE25EF004,
    0xE59FD044,
    0xE92D5000,
    0xE14FC000,
    0xE10FE000,
    0xE92D5000,
    0xE3A0C302,
    0xE5DCE09C,
    0xE35E00A5,
    0x1A000004,
    0x05DCE0B4,
    0x021EE080,
    0xE28FE004,
    0x159FF018,
    0x059FF018,
    0xE59FD018,
    0xE8BD5000,
    0xE169F00C,
    0xE8BD5000,
    0xE25EF004,
    0x03007FF0,
    0x09FE2000,
    0x09FFC000,
    0x03007FE0
};

variable_desc saveGameStruct[] = {
    { &DISPCNT, sizeof(uint16_t) },
    { &DISPSTAT, sizeof(uint16_t) },
    { &VCOUNT, sizeof(uint16_t) },
    { &BG0CNT, sizeof(uint16_t) },
    { &BG1CNT, sizeof(uint16_t) },
    { &BG2CNT, sizeof(uint16_t) },
    { &BG3CNT, sizeof(uint16_t) },
    { &BG0HOFS, sizeof(uint16_t) },
    { &BG0VOFS, sizeof(uint16_t) },
    { &BG1HOFS, sizeof(uint16_t) },
    { &BG1VOFS, sizeof(uint16_t) },
    { &BG2HOFS, sizeof(uint16_t) },
    { &BG2VOFS, sizeof(uint16_t) },
    { &BG3HOFS, sizeof(uint16_t) },
    { &BG3VOFS, sizeof(uint16_t) },
    { &BG2PA, sizeof(uint16_t) },
    { &BG2PB, sizeof(uint16_t) },
    { &BG2PC, sizeof(uint16_t) },
    { &BG2PD, sizeof(uint16_t) },
    { &BG2X_L, sizeof(uint16_t) },
    { &BG2X_H, sizeof(uint16_t) },
    { &BG2Y_L, sizeof(uint16_t) },
    { &BG2Y_H, sizeof(uint16_t) },
    { &BG3PA, sizeof(uint16_t) },
    { &BG3PB, sizeof(uint16_t) },
    { &BG3PC, sizeof(uint16_t) },
    { &BG3PD, sizeof(uint16_t) },
    { &BG3X_L, sizeof(uint16_t) },
    { &BG3X_H, sizeof(uint16_t) },
    { &BG3Y_L, sizeof(uint16_t) },
    { &BG3Y_H, sizeof(uint16_t) },
    { &WIN0H, sizeof(uint16_t) },
    { &WIN1H, sizeof(uint16_t) },
    { &WIN0V, sizeof(uint16_t) },
    { &WIN1V, sizeof(uint16_t) },
    { &WININ, sizeof(uint16_t) },
    { &WINOUT, sizeof(uint16_t) },
    { &MOSAIC, sizeof(uint16_t) },
    { &BLDMOD, sizeof(uint16_t) },
    { &COLEV, sizeof(uint16_t) },
    { &COLY, sizeof(uint16_t) },
    { &DM0SAD_L, sizeof(uint16_t) },
    { &DM0SAD_H, sizeof(uint16_t) },
    { &DM0DAD_L, sizeof(uint16_t) },
    { &DM0DAD_H, sizeof(uint16_t) },
    { &DM0CNT_L, sizeof(uint16_t) },
    { &DM0CNT_H, sizeof(uint16_t) },
    { &DM1SAD_L, sizeof(uint16_t) },
    { &DM1SAD_H, sizeof(uint16_t) },
    { &DM1DAD_L, sizeof(uint16_t) },
    { &DM1DAD_H, sizeof(uint16_t) },
    { &DM1CNT_L, sizeof(uint16_t) },
    { &DM1CNT_H, sizeof(uint16_t) },
    { &DM2SAD_L, sizeof(uint16_t) },
    { &DM2SAD_H, sizeof(uint16_t) },
    { &DM2DAD_L, sizeof(uint16_t) },
    { &DM2DAD_H, sizeof(uint16_t) },
    { &DM2CNT_L, sizeof(uint16_t) },
    { &DM2CNT_H, sizeof(uint16_t) },
    { &DM3SAD_L, sizeof(uint16_t) },
    { &DM3SAD_H, sizeof(uint16_t) },
    { &DM3DAD_L, sizeof(uint16_t) },
    { &DM3DAD_H, sizeof(uint16_t) },
    { &DM3CNT_L, sizeof(uint16_t) },
    { &DM3CNT_H, sizeof(uint16_t) },
    { &TM0D, sizeof(uint16_t) },
    { &TM0CNT, sizeof(uint16_t) },
    { &TM1D, sizeof(uint16_t) },
    { &TM1CNT, sizeof(uint16_t) },
    { &TM2D, sizeof(uint16_t) },
    { &TM2CNT, sizeof(uint16_t) },
    { &TM3D, sizeof(uint16_t) },
    { &TM3CNT, sizeof(uint16_t) },
    { &P1, sizeof(uint16_t) },
    { &IE, sizeof(uint16_t) },
    { &IF, sizeof(uint16_t) },
    { &IME, sizeof(uint16_t) },
    { &holdState, sizeof(bool) },
    { &holdType, sizeof(int) },
    { &lcdTicks, sizeof(int) },
    { &timer0On, sizeof(bool) },
    { &timer0Ticks, sizeof(int) },
    { &timer0Reload, sizeof(int) },
    { &timer0ClockReload, sizeof(int) },
    { &timer1On, sizeof(bool) },
    { &timer1Ticks, sizeof(int) },
    { &timer1Reload, sizeof(int) },
    { &timer1ClockReload, sizeof(int) },
    { &timer2On, sizeof(bool) },
    { &timer2Ticks, sizeof(int) },
    { &timer2Reload, sizeof(int) },
    { &timer2ClockReload, sizeof(int) },
    { &timer3On, sizeof(bool) },
    { &timer3Ticks, sizeof(int) },
    { &timer3Reload, sizeof(int) },
    { &timer3ClockReload, sizeof(int) },
    { &dma0Source, sizeof(uint32_t) },
    { &dma0Dest, sizeof(uint32_t) },
    { &dma1Source, sizeof(uint32_t) },
    { &dma1Dest, sizeof(uint32_t) },
    { &dma2Source, sizeof(uint32_t) },
    { &dma2Dest, sizeof(uint32_t) },
    { &dma3Source, sizeof(uint32_t) },
    { &dma3Dest, sizeof(uint32_t) },
    { &fxOn, sizeof(bool) },
    { &windowOn, sizeof(bool) },
    { &N_FLAG, sizeof(bool) },
    { &C_FLAG, sizeof(bool) },
    { &Z_FLAG, sizeof(bool) },
    { &V_FLAG, sizeof(bool) },
    { &armState, sizeof(bool) },
    { &armIrqEnable, sizeof(bool) },
    { &armNextPC, sizeof(uint32_t) },
    { &armMode, sizeof(int) },
    { &coreOptions.saveType, sizeof(int) },
    { NULL, 0 }
};

static int romSize = SIZE_ROM;

void gbaUpdateRomSize(int size)
{
    // Only change memory block if new size is larger
    if (size > romSize) {
        romSize = size;

        uint8_t* tmp = (uint8_t*)realloc(g_rom, SIZE_ROM);
        g_rom = tmp;

        uint16_t* temp = (uint16_t*)(g_rom + ((romSize + 1) & ~1));
        for (int i = (romSize + 1) & ~1; i < SIZE_ROM; i += 2) {
            WRITE16LE(temp, (i >> 1) & 0xFFFF);
            temp++;
        }
    }
}

#ifdef PROFILING
void cpuProfil(profile_segment* seg)
{
    profilSegment = seg;
}

void cpuEnableProfiling(int hz)
{
    if (hz == 0)
        hz = 100;
    profilingTicks = profilingTicksReload = 16777216 / hz;
    profSetHertz(hz);
}
#endif

inline int CPUUpdateTicks()
{
    int cpuLoopTicks = lcdTicks;

    //if (soundTicks < cpuLoopTicks)
        //cpuLoopTicks = soundTicks;

    if (timer0On && (timer0Ticks < cpuLoopTicks)) {
        cpuLoopTicks = timer0Ticks;
    }
    if (timer1On && !(TM1CNT & 4) && (timer1Ticks < cpuLoopTicks)) {
        cpuLoopTicks = timer1Ticks;
    }
    if (timer2On && !(TM2CNT & 4) && (timer2Ticks < cpuLoopTicks)) {
        cpuLoopTicks = timer2Ticks;
    }
    if (timer3On && !(TM3CNT & 4) && (timer3Ticks < cpuLoopTicks)) {
        cpuLoopTicks = timer3Ticks;
    }
#ifdef PROFILING
    if (profilingTicksReload != 0) {
        if (profilingTicks < cpuLoopTicks) {
            cpuLoopTicks = profilingTicks;
        }
    }
#endif

    if (SWITicks) {
        if (SWITicks < cpuLoopTicks)
            cpuLoopTicks = SWITicks;
    }

    if (IRQTicks) {
        if (IRQTicks < cpuLoopTicks)
            cpuLoopTicks = IRQTicks;
    }

    return cpuLoopTicks;
}

void CPUUpdateWindow0()
{
    int x00 = WIN0H >> 8;
    int x01 = WIN0H & 255;

    if (x00 <= x01) {
        for (int i = 0; i < 240; i++) {
            gfxInWin0[i] = (i >= x00 && i < x01);
        }
    } else {
        for (int i = 0; i < 240; i++) {
            gfxInWin0[i] = (i >= x00 || i < x01);
        }
    }
}

void CPUUpdateWindow1()
{
    int x00 = WIN1H >> 8;
    int x01 = WIN1H & 255;

    if (x00 <= x01) {
        for (int i = 0; i < 240; i++) {
            gfxInWin1[i] = (i >= x00 && i < x01);
        }
    } else {
        for (int i = 0; i < 240; i++) {
            gfxInWin1[i] = (i >= x00 || i < x01);
        }
    }
}

extern uint32_t g_line0[240];
extern uint32_t g_line1[240];
extern uint32_t g_line2[240];
extern uint32_t g_line3[240];

#define CLEAR_ARRAY(a)                  \
    {                                   \
        uint32_t* array = (a);               \
        for (int i = 0; i < 240; i++) { \
            *array++ = 0x80000000;      \
        }                               \
    }

void CPUUpdateRenderBuffers(bool force)
{
    if (!(coreOptions.layerEnable & 0x0100) || force) {
        CLEAR_ARRAY(g_line0);
    }
    if (!(coreOptions.layerEnable & 0x0200) || force) {
        CLEAR_ARRAY(g_line1);
    }
    if (!(coreOptions.layerEnable & 0x0400) || force) {
        CLEAR_ARRAY(g_line2);
    }
    if (!(coreOptions.layerEnable & 0x0800) || force) {
        CLEAR_ARRAY(g_line3);
    }
}

#ifdef __LIBRETRO__
#include <stddef.h>

unsigned int CPUWriteState(uint8_t* data)
{
    uint8_t* orig = data;

    utilWriteIntMem(data, SAVE_GAME_VERSION);
    utilWriteMem(data, &g_rom[0xa0], 16);
    utilWriteIntMem(data, coreOptions.useBios);
    utilWriteMem(data, &reg[0], sizeof(reg));

    utilWriteDataMem(data, saveGameStruct);

    utilWriteIntMem(data, stopState);
    utilWriteIntMem(data, IRQTicks);

    utilWriteMem(data, g_internalRAM, SIZE_IRAM);
    utilWriteMem(data, g_paletteRAM, SIZE_PRAM);
    utilWriteMem(data, g_workRAM, SIZE_WRAM);
    utilWriteMem(data, g_vram, SIZE_VRAM);
    utilWriteMem(data, g_oam, SIZE_OAM);
    utilWriteMem(data, g_pix, SIZE_PIX);
    utilWriteMem(data, g_ioMem, SIZE_IOMEM);

    eepromSaveGame(data);
    flashSaveGame(data);
    soundSaveGame(data);
    rtcSaveGame(data);

    return (ptrdiff_t)data - (ptrdiff_t)orig;
}

bool CPUReadState(const uint8_t* data)
{
    // Don't really care about version.
    int version = utilReadIntMem(data);
    if (version != SAVE_GAME_VERSION)
        return false;

    char romname[16];
    utilReadMem(romname, data, 16);
    if (memcmp(&g_rom[0xa0], romname, 16) != 0)
        return false;

    // Don't care about use bios ...
    utilReadIntMem(data);

    utilReadMem(&reg[0], data, sizeof(reg));

    utilReadDataMem(data, saveGameStruct);

    stopState = utilReadIntMem(data) ? true : false;

    IRQTicks = utilReadIntMem(data);
    if (IRQTicks > 0)
        intState = true;
    else {
        intState = false;
        IRQTicks = 0;
    }

    utilReadMem(g_internalRAM, data, SIZE_IRAM);
    utilReadMem(g_paletteRAM, data, SIZE_PRAM);
    utilReadMem(g_workRAM, data, SIZE_WRAM);
    utilReadMem(g_vram, data, SIZE_VRAM);
    utilReadMem(g_oam, data, SIZE_OAM);
    utilReadMem(g_pix, data, SIZE_PIX);
    utilReadMem(g_ioMem, data, SIZE_IOMEM);

    eepromReadGame(data);
    flashReadGame(data);
    soundReadGame(data);
    rtcReadGame(data);

    //// Copypasta stuff ...
    // set pointers!
    coreOptions.layerEnable = coreOptions.layerSettings & DISPCNT;

    CPUUpdateRender();

    // CPU Update Render Buffers set to true
    CLEAR_ARRAY(g_line0);
    CLEAR_ARRAY(g_line1);
    CLEAR_ARRAY(g_line2);
    CLEAR_ARRAY(g_line3);
    // End of CPU Update Render Buffers set to true

    CPUUpdateWindow0();
    CPUUpdateWindow1();

    SetSaveType(coreOptions.saveType);

    systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;
    if (armState) {
        ARM_PREFETCH;
    } else {
        THUMB_PREFETCH;
    }

    CPUUpdateRegister(0x204, CPUReadHalfWordQuick(0x4000204));

    return true;
}

#else // !__LIBRETRO__

static bool CPUWriteState(gzFile gzFile)
{
    utilWriteInt(gzFile, SAVE_GAME_VERSION);

    utilGzWrite(gzFile, &g_rom[0xa0], 16);

    utilWriteInt(gzFile, coreOptions.useBios);

    utilGzWrite(gzFile, &reg[0], sizeof(reg));

    utilWriteData(gzFile, saveGameStruct);

    // new to version 0.7.1
    utilWriteInt(gzFile, stopState);
    // new to version 0.8
    utilWriteInt(gzFile, IRQTicks);

    utilGzWrite(gzFile, g_internalRAM, SIZE_IRAM);
    utilGzWrite(gzFile, g_paletteRAM, SIZE_PRAM);
    utilGzWrite(gzFile, g_workRAM, SIZE_WRAM);
    utilGzWrite(gzFile, g_vram, SIZE_VRAM);
    utilGzWrite(gzFile, g_oam, SIZE_OAM);
    utilGzWrite(gzFile, g_pix, SIZE_PIX);
    utilGzWrite(gzFile, g_ioMem, SIZE_IOMEM);

    eepromSaveGame(gzFile);
    flashSaveGame(gzFile);
    soundSaveGame(gzFile);

    cheatsSaveGame(gzFile);

    // version 1.5
    rtcSaveGame(gzFile);

    return true;
}

bool CPUWriteState(const char* file)
{
    gzFile gzFile = utilGzOpen(file, "wb");

    if (gzFile == NULL) {
        systemMessage(MSG_ERROR_CREATING_FILE, N_("Error creating file %s"), file);
        return false;
    }

    bool res = CPUWriteState(gzFile);

    utilGzClose(gzFile);

    return res;
}

bool CPUWriteMemState(char* memory, int available, long& reserved)
{
    gzFile gzFile = utilMemGzOpen(memory, available, "w");

    if (gzFile == NULL) {
        return false;
    }

    bool res = CPUWriteState(gzFile);

    reserved = utilGzMemTell(gzFile) + 8;

    if (reserved >= (available))
        res = false;

    utilGzClose(gzFile);

    return res;
}

static bool CPUReadState(gzFile gzFile)
{
    int version = utilReadInt(gzFile);

    if (version > SAVE_GAME_VERSION || version < SAVE_GAME_VERSION_1) {
        systemMessage(MSG_UNSUPPORTED_VBA_SGM,
            N_("Unsupported VisualBoyAdvance save game version %d"),
            version);
        return false;
    }

    uint8_t romname[17];

    utilGzRead(gzFile, romname, 16);

    if (memcmp(&g_rom[0xa0], romname, 16) != 0) {
        romname[16] = 0;
        for (int i = 0; i < 16; i++)
            if (romname[i] < 32)
                romname[i] = 32;
        systemMessage(MSG_CANNOT_LOAD_SGM, N_("Cannot load save game for %s"), romname);
        return false;
    }

    bool ub = utilReadInt(gzFile) ? true : false;

    if (ub != (bool)(coreOptions.useBios)) {
        if (coreOptions.useBios)
            systemMessage(MSG_SAVE_GAME_NOT_USING_BIOS,
                N_("Save game is not using the BIOS files"));
        else
            systemMessage(MSG_SAVE_GAME_USING_BIOS,
                N_("Save game is using the BIOS file"));
        return false;
    }

    utilGzRead(gzFile, &reg[0], sizeof(reg));

    utilReadData(gzFile, saveGameStruct);

    if (version < SAVE_GAME_VERSION_3)
        stopState = false;
    else
        stopState = utilReadInt(gzFile) ? true : false;

    if (version < SAVE_GAME_VERSION_4) {
        IRQTicks = 0;
        intState = false;
    } else {
        IRQTicks = utilReadInt(gzFile);
        if (IRQTicks > 0)
            intState = true;
        else {
            intState = false;
            IRQTicks = 0;
        }
    }

    utilGzRead(gzFile, g_internalRAM, SIZE_IRAM);
    utilGzRead(gzFile, g_paletteRAM, SIZE_PRAM);
    utilGzRead(gzFile, g_workRAM, SIZE_WRAM);
    utilGzRead(gzFile, g_vram, SIZE_VRAM);
    utilGzRead(gzFile, g_oam, SIZE_OAM);
    if (version < SAVE_GAME_VERSION_6)
        utilGzRead(gzFile, g_pix, 4 * 240 * 160);
    else
        utilGzRead(gzFile, g_pix, SIZE_PIX);
    utilGzRead(gzFile, g_ioMem, SIZE_IOMEM);

    if (coreOptions.skipSaveGameBattery) {
        // skip eeprom data
        eepromReadGameSkip(gzFile, version);
        // skip flash data
        flashReadGameSkip(gzFile, version);
    } else {
        eepromReadGame(gzFile, version);
        flashReadGame(gzFile, version);
    }
    soundReadGame(gzFile, version);

    if (version > SAVE_GAME_VERSION_1) {
        if (coreOptions.skipSaveGameCheats) {
            // skip cheats list data
            cheatsReadGameSkip(gzFile, version);
        } else {
            cheatsReadGame(gzFile, version);
        }
    }
    if (version > SAVE_GAME_VERSION_6) {
        rtcReadGame(gzFile);
    }

    if (version <= SAVE_GAME_VERSION_7) {
        uint32_t temp;
#define SWAP(a, b, c)      \
    temp = (a);            \
    (a) = (b) << 16 | (c); \
    (b) = (temp) >> 16;    \
    (c) = (temp)&0xFFFF;

        SWAP(dma0Source, DM0SAD_H, DM0SAD_L);
        SWAP(dma0Dest, DM0DAD_H, DM0DAD_L);
        SWAP(dma1Source, DM1SAD_H, DM1SAD_L);
        SWAP(dma1Dest, DM1DAD_H, DM1DAD_L);
        SWAP(dma2Source, DM2SAD_H, DM2SAD_L);
        SWAP(dma2Dest, DM2DAD_H, DM2DAD_L);
        SWAP(dma3Source, DM3SAD_H, DM3SAD_L);
        SWAP(dma3Dest, DM3DAD_H, DM3DAD_L);
    }

    if (version <= SAVE_GAME_VERSION_8) {
        timer0ClockReload = TIMER_TICKS[TM0CNT & 3];
        timer1ClockReload = TIMER_TICKS[TM1CNT & 3];
        timer2ClockReload = TIMER_TICKS[TM2CNT & 3];
        timer3ClockReload = TIMER_TICKS[TM3CNT & 3];

        timer0Ticks = ((0x10000 - TM0D) << timer0ClockReload) - timer0Ticks;
        timer1Ticks = ((0x10000 - TM1D) << timer1ClockReload) - timer1Ticks;
        timer2Ticks = ((0x10000 - TM2D) << timer2ClockReload) - timer2Ticks;
        timer3Ticks = ((0x10000 - TM3D) << timer3ClockReload) - timer3Ticks;
        interp_rate();
    }

    // set pointers!
    coreOptions.layerEnable = coreOptions.layerSettings & DISPCNT;

    CPUUpdateRender();
    CPUUpdateRenderBuffers(true);
    CPUUpdateWindow0();
    CPUUpdateWindow1();

    SetSaveType(coreOptions.saveType);

    systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;
    if (armState) {
        ARM_PREFETCH;
    } else {
        THUMB_PREFETCH;
    }

    CPUUpdateRegister(0x204, CPUReadHalfWordQuick(0x4000204));

    return true;
}

bool CPUReadMemState(char* memory, int available)
{
    gzFile gzFile = utilMemGzOpen(memory, available, "r");

    bool res = CPUReadState(gzFile);

    utilGzClose(gzFile);

    return res;
}

bool CPUReadState(const char* file)
{
    gzFile gzFile = utilGzOpen(file, "rb");

    if (gzFile == NULL)
        return false;

    bool res = CPUReadState(gzFile);

    utilGzClose(gzFile);

    return res;
}
#endif

bool CPUExportEepromFile(const char* fileName)
{
    if (eepromInUse) {
        FILE* file = utilOpenFile(fileName, "wb");

        if (!file) {
            systemMessage(MSG_ERROR_CREATING_FILE, N_("Error creating file %s"),
                fileName);
            return false;
        }

        for (int i = 0; i < eepromSize;) {
            for (int j = 0; j < 8; j++) {
                if (fwrite(&eepromData[i + 7 - j], 1, 1, file) != 1) {
                    fclose(file);
                    return false;
                }
            }
            i += 8;
        }
        fclose(file);
    }
    return true;
}

bool CPUWriteBatteryFile(const char* fileName)
{
    if ((coreOptions.saveType) && (coreOptions.saveType != GBA_SAVE_NONE)) {
        FILE* file = utilOpenFile(fileName, "wb");

        if (!file) {
            systemMessage(MSG_ERROR_CREATING_FILE, N_("Error creating file %s"),
                fileName);
            return false;
        }

        // only save if Flash/Sram in use or EEprom in use
        if (!eepromInUse) {
            if (coreOptions.saveType == GBA_SAVE_FLASH) { // save flash type
                if (fwrite(flashSaveMemory, 1, g_flashSize, file) != (size_t)g_flashSize) {
                    fclose(file);
                    return false;
                }
            } else if (coreOptions.saveType == GBA_SAVE_SRAM) { // save sram type
                if (fwrite(flashSaveMemory, 1, 0x8000, file) != 0x8000) {
                    fclose(file);
                    return false;
                }
            }
        } else { // save eeprom type
            if (fwrite(eepromData, 1, eepromSize, file) != (size_t)eepromSize) {
                fclose(file);
                return false;
            }
        }
        fclose(file);
    }
    return true;
}

bool CPUReadGSASnapshot(const char* fileName)
{
    int i;
    FILE* file = utilOpenFile(fileName, "rb");

    if (!file) {
        systemMessage(MSG_CANNOT_OPEN_FILE, N_("Cannot open file %s"), fileName);
        return false;
    }

    // check file size to know what we should read
    fseek(file, 0, SEEK_END);

    // long size = ftell(file);
    fseek(file, 0x0, SEEK_SET);
    FREAD_UNCHECKED(&i, 1, 4, file);
    fseek(file, i, SEEK_CUR); // Skip SharkPortSave
    fseek(file, 4, SEEK_CUR); // skip some sort of flag
    FREAD_UNCHECKED(&i, 1, 4, file); // name length
    fseek(file, i, SEEK_CUR); // skip name
    FREAD_UNCHECKED(&i, 1, 4, file); // desc length
    fseek(file, i, SEEK_CUR); // skip desc
    FREAD_UNCHECKED(&i, 1, 4, file); // notes length
    fseek(file, i, SEEK_CUR); // skip notes
    int saveSize;
    FREAD_UNCHECKED(&saveSize, 1, 4, file); // read length
    saveSize -= 0x1c; // remove header size
    char buffer[17];
    char buffer2[17];
    FREAD_UNCHECKED(buffer, 1, 16, file);
    buffer[16] = 0;
    for (i = 0; i < 16; i++)
        if (buffer[i] < 32)
            buffer[i] = 32;
    memcpy(buffer2, &g_rom[0xa0], 16);
    buffer2[16] = 0;
    for (i = 0; i < 16; i++)
        if (buffer2[i] < 32)
            buffer2[i] = 32;
    if (memcmp(buffer, buffer2, 16)) {
        systemMessage(MSG_CANNOT_IMPORT_SNAPSHOT_FOR,
            N_("Cannot import snapshot for %s. Current game is %s"),
            buffer,
            buffer2);
        fclose(file);
        return false;
    }
    fseek(file, 12, SEEK_CUR); // skip some flags
    if (saveSize >= 65536) {
        if (fread(flashSaveMemory, 1, saveSize, file) != (size_t)saveSize) {
            fclose(file);
            return false;
        }
    } else {
        systemMessage(MSG_UNSUPPORTED_SNAPSHOT_FILE,
            N_("Unsupported snapshot file %s"),
            fileName);
        fclose(file);
        return false;
    }
    fclose(file);
    CPUReset();
    return true;
}

bool CPUReadGSASPSnapshot(const char* fileName)
{
    const char gsvfooter[] = "xV4\x12";
    const size_t namepos = 0x0c, namesz = 12;
    const size_t footerpos = 0x42c, footersz = 4;

    char footer[footersz + 1], romname[namesz + 1], savename[namesz + 1];

    FILE* file = utilOpenFile(fileName, "rb");

    if (!file) {
        systemMessage(MSG_CANNOT_OPEN_FILE, N_("Cannot open file %s"), fileName);
        return false;
    }

    // read save name
    fseek(file, namepos, SEEK_SET);
    FREAD_UNCHECKED(savename, 1, namesz, file);
    savename[namesz] = 0;

    memcpy(romname, &g_rom[0xa0], namesz);
    romname[namesz] = 0;

    if (memcmp(romname, savename, namesz)) {
        systemMessage(MSG_CANNOT_IMPORT_SNAPSHOT_FOR,
            N_("Cannot import snapshot for %s. Current game is %s"),
            savename,
            romname);
        fclose(file);
        return false;
    }

    // read footer tag
    fseek(file, footerpos, SEEK_SET);
    FREAD_UNCHECKED(footer, 1, footersz, file);
    footer[footersz] = 0;

    if (memcmp(footer, gsvfooter, footersz)) {
        systemMessage(0,
            N_("Unsupported snapshot file %s. Footer '%s' at %u should be '%s'"),
            fileName,
            footer,
            footerpos,
            gsvfooter);
        fclose(file);
        return false;
    }

    // Read up to 128k save
    FREAD_UNCHECKED(flashSaveMemory, 1, FLASH_128K_SZ, file);

    fclose(file);
    CPUReset();
    return true;
}

bool CPUWriteGSASnapshot(const char* fileName,
    const char* title,
    const char* desc,
    const char* notes)
{
    FILE* file = utilOpenFile(fileName, "wb");

    if (!file) {
        systemMessage(MSG_CANNOT_OPEN_FILE, N_("Cannot open file %s"), fileName);
        return false;
    }

    uint8_t buffer[17];

    utilPutDword(buffer, 0x0d); // SharkPortSave length
    fwrite(buffer, 1, 4, file);
    fwrite("SharkPortSave", 1, 0x0d, file);
    utilPutDword(buffer, 0x000f0000);
    fwrite(buffer, 1, 4, file); // save type 0x000f0000 = GBA save
    utilPutDword(buffer, (uint32_t)strlen(title));
    fwrite(buffer, 1, 4, file); // title length
    fwrite(title, 1, strlen(title), file);
    utilPutDword(buffer, (uint32_t)strlen(desc));
    fwrite(buffer, 1, 4, file); // desc length
    fwrite(desc, 1, strlen(desc), file);
    utilPutDword(buffer, (uint32_t)strlen(notes));
    fwrite(buffer, 1, 4, file); // notes length
    fwrite(notes, 1, strlen(notes), file);
    int saveSize = 0x10000;
    if (coreOptions.saveType == GBA_SAVE_FLASH)
        saveSize = g_flashSize;
    int totalSize = saveSize + 0x1c;

    utilPutDword(buffer, totalSize); // length of remainder of save - CRC
    fwrite(buffer, 1, 4, file);

    char* temp = new char[0x2001c];
    memset(temp, 0, 28);
    memcpy(temp, &g_rom[0xa0], 16); // copy internal name
    temp[0x10] = g_rom[0xbe]; // reserved area (old checksum)
    temp[0x11] = g_rom[0xbf]; // reserved area (old checksum)
    temp[0x12] = g_rom[0xbd]; // complement check
    temp[0x13] = g_rom[0xb0]; // maker
    temp[0x14] = 1; // 1 save ?
    memcpy(&temp[0x1c], flashSaveMemory, saveSize); // copy save
    fwrite(temp, 1, totalSize, file); // write save + header
    uint32_t crc = 0;

    for (int i = 0; i < totalSize; i++) {
        crc += ((uint32_t)temp[i] << (crc % 0x18));
    }

    utilPutDword(buffer, crc);
    fwrite(buffer, 1, 4, file); // CRC?

    fclose(file);
    delete[] temp;
    return true;
}

bool CPUImportEepromFile(const char* fileName)
{
    FILE* file = utilOpenFile(fileName, "rb");

    if (!file)
        return false;

    // check file size to know what we should read
    fseek(file, 0, SEEK_END);

    long size = ftell(file);
    fseek(file, 0, SEEK_SET);
    if (size == 512 || size == 0x2000) {
        if (fread(eepromData, 1, size, file) != (size_t)size) {
            fclose(file);
            return false;
        }
        for (int i = 0; i < size;) {
            uint8_t tmp = eepromData[i];
            eepromData[i] = eepromData[7 - i];
            eepromData[7 - i] = tmp;
            i++;
            tmp = eepromData[i];
            eepromData[i] = eepromData[7 - i];
            eepromData[7 - i] = tmp;
            i++;
            tmp = eepromData[i];
            eepromData[i] = eepromData[7 - i];
            eepromData[7 - i] = tmp;
            i++;
            tmp = eepromData[i];
            eepromData[i] = eepromData[7 - i];
            eepromData[7 - i] = tmp;
            i++;
            i += 4;
        }
    } else {
        fclose(file);
        return false;
    }
    fclose(file);
    return true;
}

bool CPUReadBatteryFile(const char* fileName)
{
    FILE* file = utilOpenFile(fileName, "rb");

    if (!file)
        return false;

    // check file size to know what we should read
    fseek(file, 0, SEEK_END);

    long size = ftell(file);
    fseek(file, 0, SEEK_SET);
    systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;

    if (size == 512 || size == 0x2000) {
        if (fread(eepromData, 1, size, file) != (size_t)size) {
            fclose(file);
            return false;
        }
    } else {
        if (size == 0x20000) {
            if (fread(flashSaveMemory, 1, 0x20000, file) != 0x20000) {
                fclose(file);
                return false;
            }
            flashSetSize(0x20000);
        } else if (size == 0x10000) {
            if (fread(flashSaveMemory, 1, 0x10000, file) != 0x10000) {
                fclose(file);
                return false;
            }
            flashSetSize(0x10000);
        } else if (size == 0x8000) {
            if (fread(flashSaveMemory, 1, 0x8000, file) != 0x8000) {
                fclose(file);
                return false;
            }
        }
    }
    fclose(file);
    return true;
}

#ifndef __LIBRETRO__
bool CPUWritePNGFile(const char* fileName)
{
    return utilWritePNGFile(fileName, 240, 160, g_pix);
}

bool CPUWriteBMPFile(const char* fileName)
{
    return utilWriteBMPFile(fileName, 240, 160, g_pix);
}
#endif /* !__LIBRETRO__ */

bool CPUIsZipFile(const char* file)
{
    if (strlen(file) > 4) {
        const char* p = strrchr(file, '.');

        if (p != NULL) {
            if (_stricmp(p, ".zip") == 0)
                return true;
        }
    }

    return false;
}

bool CPUIsGBAImage(const char* file)
{
    coreOptions.cpuIsMultiBoot = false;
    if (strlen(file) > 4) {
        const char* p = strrchr(file, '.');

        if (p != NULL) {
            if (_stricmp(p, ".gba") == 0)
                return true;
            if (_stricmp(p, ".agb") == 0)
                return true;
            if (_stricmp(p, ".bin") == 0)
                return true;
            if (_stricmp(p, ".elf") == 0)
                return true;
            if (_stricmp(p, ".mb") == 0) {
                coreOptions.cpuIsMultiBoot = true;
                return true;
            }
        }
    }

    return false;
}

bool CPUIsGBABios(const char* file)
{
    if (strlen(file) > 4) {
        const char* p = strrchr(file, '.');

        if (p != NULL) {
            if (_stricmp(p, ".gba") == 0)
                return true;
            if (_stricmp(p, ".agb") == 0)
                return true;
            if (_stricmp(p, ".bin") == 0)
                return true;
            if (_stricmp(p, ".bios") == 0)
                return true;
            if (_stricmp(p, ".rom") == 0)
                return true;
        }
    }

    return false;
}

bool CPUIsELF(const char* file)
{
    if (file == NULL)
        return false;

    if (strlen(file) > 4) {
        const char* p = strrchr(file, '.');

        if (p != NULL) {
            if (_stricmp(p, ".elf") == 0)
                return true;
        }
    }
    return false;
}

void CPUCleanUp()
{
#ifdef PROFILING
    if (profilingTicksReload) {
        profCleanup();
    }
#endif

    if (g_rom != NULL) {
        free(g_rom);
        g_rom = NULL;
    }

    if (g_vram != NULL) {
        free(g_vram);
        g_vram = NULL;
    }

    if (g_paletteRAM != NULL) {
        free(g_paletteRAM);
        g_paletteRAM = NULL;
    }

    if (g_internalRAM != NULL) {
        free(g_internalRAM);
        g_internalRAM = NULL;
    }

    if (g_workRAM != NULL) {
        free(g_workRAM);
        g_workRAM = NULL;
    }

    if (g_bios != NULL) {
        free(g_bios);
        g_bios = NULL;
    }

    if (g_pix != NULL) {
        free(g_pix);
        g_pix = NULL;
    }

    if (g_oam != NULL) {
        free(g_oam);
        g_oam = NULL;
    }

    if (g_ioMem != NULL) {
        free(g_ioMem);
        g_ioMem = NULL;
    }

#if defined(VBAM_ENABLE_DEBUGGER)
    elfCleanUp();
#endif  // defined(VBAM_ENABLE_DEBUGGER)

    systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;

    emulating = 0;
}

void SetMapMasks()
{
    map[0].mask = 0x3FFF;
    map[2].mask = 0x3FFFF;
    map[3].mask = 0x7FFF;
    map[4].mask = 0x3FF;
    map[5].mask = 0x3FF;
    map[6].mask = 0x1FFFF;
    map[7].mask = 0x3FF;
    map[8].mask = 0x1FFFFFF;
    map[9].mask = 0x1FFFFFF;
    map[10].mask = 0x1FFFFFF;
    map[12].mask = 0x1FFFFFF;
    map[14].mask = 0xFFFF;

#ifdef VBAM_ENABLE_DEBUGGER
    for (int i = 0; i < 16; i++) {
        map[i].size = map[i].mask + 1;
        map[i].trace = NULL;
        map[i].breakPoints = NULL;

        if ((map[i].size >> 1) > 0) {
            map[i].breakPoints = (uint8_t*)calloc(map[i].size >> 1, sizeof(uint8_t));
            if (map[i].breakPoints == NULL) {
                systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
                    "TRACE");
            }
        }

        if ((map[i].size >> 3) > 0) {
            map[i].trace = (uint8_t*)calloc(map[i].size >> 3, sizeof(uint8_t));
            if (map[i].trace == NULL) {
                systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
                    "TRACE");
            }
        }
    }
    clearBreakRegList();
#endif
}

int CPULoadRom(const char* szFile)
{
    romSize = SIZE_ROM;
    if (g_rom != NULL) {
        CPUCleanUp();
    }

    systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;

    g_rom = (uint8_t*)malloc(SIZE_ROM);
    if (g_rom == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "ROM");
        return 0;
    }
    g_workRAM = (uint8_t*)calloc(1, SIZE_WRAM);
    if (g_workRAM == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "WRAM");
        return 0;
    }

    uint8_t* whereToLoad = coreOptions.cpuIsMultiBoot ? g_workRAM : g_rom;

#if defined(VBAM_ENABLE_DEBUGGER)
    if (CPUIsELF(szFile)) {
        FILE* f = utilOpenFile(szFile, "rb");
        if (!f) {
            systemMessage(MSG_ERROR_OPENING_IMAGE, N_("Error opening image %s"),
                szFile);
            free(g_rom);
            g_rom = NULL;
            free(g_workRAM);
            g_workRAM = NULL;
            return 0;
        }
        bool res = elfRead(szFile, romSize, f);
        if (!res || romSize == 0) {
            free(g_rom);
            g_rom = NULL;
            free(g_workRAM);
            g_workRAM = NULL;
            elfCleanUp();
            return 0;
        }
    } else
#endif  // defined(VBAM_ENABLE_DEBUGGER)
        if (szFile != NULL) {
        if (!utilLoad(szFile,
                utilIsGBAImage,
                whereToLoad,
                romSize)) {
            free(g_rom);
            g_rom = NULL;
            free(g_workRAM);
            g_workRAM = NULL;
            return 0;
        }
    }

    uint16_t* temp = (uint16_t*)(g_rom + ((romSize + 1) & ~1));
    int i;
    for (i = (romSize + 1) & ~1; i < SIZE_ROM; i += 2) {
        WRITE16LE(temp, (i >> 1) & 0xFFFF);
        temp++;
    }

    g_bios = (uint8_t*)calloc(1, SIZE_BIOS);
    if (g_bios == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "BIOS");
        CPUCleanUp();
        return 0;
    }
    g_internalRAM = (uint8_t*)calloc(1, SIZE_IRAM);
    if (g_internalRAM == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "IRAM");
        CPUCleanUp();
        return 0;
    }
    g_paletteRAM = (uint8_t*)calloc(1, SIZE_PRAM);
    if (g_paletteRAM == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "PRAM");
        CPUCleanUp();
        return 0;
    }
    g_vram = (uint8_t*)calloc(1, SIZE_VRAM);
    if (g_vram == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "VRAM");
        CPUCleanUp();
        return 0;
    }
    g_oam = (uint8_t*)calloc(1, SIZE_OAM);
    if (g_oam == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "OAM");
        CPUCleanUp();
        return 0;
    }

    g_pix = (uint8_t*)calloc(1, 4 * 241 * 162);
    if (g_pix == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "PIX");
        CPUCleanUp();
        return 0;
    }
    g_ioMem = (uint8_t*)calloc(1, SIZE_IOMEM);
    if (g_ioMem == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "IO");
        CPUCleanUp();
        return 0;
    }

    flashInit();
    eepromInit();

    CPUUpdateRenderBuffers(true);

    return romSize;
}

int CPULoadRomData(const char* data, int size)
{
    romSize = SIZE_ROM;
    if (g_rom != NULL) {
        CPUCleanUp();
    }

    systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;

    g_rom = (uint8_t*)malloc(SIZE_ROM);
    if (g_rom == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "ROM");
        return 0;
    }
    g_workRAM = (uint8_t*)calloc(1, SIZE_WRAM);
    if (g_workRAM == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "WRAM");
        return 0;
    }

    uint8_t* whereToLoad = coreOptions.cpuIsMultiBoot ? g_workRAM : g_rom;

    romSize = size % 2 == 0 ? size : size + 1;
    memcpy(whereToLoad, data, size);

    uint16_t* temp = (uint16_t*)(g_rom + ((romSize + 1) & ~1));
    int i;
    for (i = (romSize + 1) & ~1; i < SIZE_ROM; i += 2) {
        WRITE16LE(temp, (i >> 1) & 0xFFFF);
        temp++;
    }

    g_bios = (uint8_t*)calloc(1, SIZE_BIOS);
    if (g_bios == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "BIOS");
        CPUCleanUp();
        return 0;
    }
    g_internalRAM = (uint8_t*)calloc(1, SIZE_IRAM);
    if (g_internalRAM == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "IRAM");
        CPUCleanUp();
        return 0;
    }
    g_paletteRAM = (uint8_t*)calloc(1, SIZE_PRAM);
    if (g_paletteRAM == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "PRAM");
        CPUCleanUp();
        return 0;
    }
    g_vram = (uint8_t*)calloc(1, SIZE_VRAM);
    if (g_vram == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "VRAM");
        CPUCleanUp();
        return 0;
    }
    g_oam = (uint8_t*)calloc(1, SIZE_OAM);
    if (g_oam == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "OAM");
        CPUCleanUp();
        return 0;
    }

    g_pix = (uint8_t*)calloc(1, 4 * 240 * 160);
    if (g_pix == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "PIX");
        CPUCleanUp();
        return 0;
    }
    g_ioMem = (uint8_t*)calloc(1, SIZE_IOMEM);
    if (g_ioMem == NULL) {
        systemMessage(MSG_OUT_OF_MEMORY, N_("Failed to allocate memory for %s"),
            "IO");
        CPUCleanUp();
        return 0;
    }

    flashInit();
    eepromInit();

    CPUUpdateRenderBuffers(true);

    return romSize;
}

void doMirroring(bool b)
{
    if (static_cast<size_t>(romSize) > k32MiB)
        return;

    int romSizeRounded = romSize;
    romSizeRounded--;
    romSizeRounded |= romSizeRounded >> 1;
    romSizeRounded |= romSizeRounded >> 2;
    romSizeRounded |= romSizeRounded >> 4;
    romSizeRounded |= romSizeRounded >> 8;
    romSizeRounded |= romSizeRounded >> 16;
    romSizeRounded++;
    uint32_t mirroredRomSize = (((romSizeRounded) >> 20) & 0x3F) << 20;
    uint32_t mirroredRomAddress = mirroredRomSize;
    if ((mirroredRomSize <= 0x800000) && (b)) {
        if (mirroredRomSize == 0)
            mirroredRomSize = 0x100000;
        while (mirroredRomAddress < 0x01000000) {
            memcpy((uint16_t*)(g_rom + mirroredRomAddress), (uint16_t*)(g_rom), mirroredRomSize);
            mirroredRomAddress += mirroredRomSize;
        }
    }
}

const char* GetLoadDotCodeFile()
{
    return coreOptions.loadDotCodeFile;
}

const char* GetSaveDotCodeFile()
{
    return coreOptions.saveDotCodeFile;
}

void ResetLoadDotCodeFile()
{
    if (coreOptions.loadDotCodeFile) {
        free((char*)coreOptions.loadDotCodeFile);
    }

    coreOptions.loadDotCodeFile = strdup("");
}

void SetLoadDotCodeFile(const char* szFile)
{
    coreOptions.loadDotCodeFile = strdup(szFile);
}

void ResetSaveDotCodeFile()
{
    if (coreOptions.saveDotCodeFile) {
        free((char*)coreOptions.saveDotCodeFile);
    }

    coreOptions.saveDotCodeFile = strdup("");
}

void SetSaveDotCodeFile(const char* szFile)
{
    coreOptions.saveDotCodeFile = strdup(szFile);
}

void CPUUpdateRender()
{
    switch (DISPCNT & 7) {
    case 0:
        if ((!fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000)) || coreOptions.cpuDisableSfx)
            renderLine = mode0RenderLine;
        else if (fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000))
            renderLine = mode0RenderLineNoWindow;
        else
            renderLine = mode0RenderLineAll;
        break;
    case 1:
        if ((!fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000)) || coreOptions.cpuDisableSfx)
            renderLine = mode1RenderLine;
        else if (fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000))
            renderLine = mode1RenderLineNoWindow;
        else
            renderLine = mode1RenderLineAll;
        break;
    case 2:
        if ((!fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000)) || coreOptions.cpuDisableSfx)
            renderLine = mode2RenderLine;
        else if (fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000))
            renderLine = mode2RenderLineNoWindow;
        else
            renderLine = mode2RenderLineAll;
        break;
    case 3:
        if ((!fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000)) || coreOptions.cpuDisableSfx)
            renderLine = mode3RenderLine;
        else if (fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000))
            renderLine = mode3RenderLineNoWindow;
        else
            renderLine = mode3RenderLineAll;
        break;
    case 4:
        if ((!fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000)) || coreOptions.cpuDisableSfx)
            renderLine = mode4RenderLine;
        else if (fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000))
            renderLine = mode4RenderLineNoWindow;
        else
            renderLine = mode4RenderLineAll;
        break;
    case 5:
        if ((!fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000)) || coreOptions.cpuDisableSfx)
            renderLine = mode5RenderLine;
        else if (fxOn && !windowOn && !(coreOptions.layerEnable & 0x8000))
            renderLine = mode5RenderLineNoWindow;
        else
            renderLine = mode5RenderLineAll;
    default:
        break;
    }
}

void CPUUpdateCPSR()
{
    uint32_t CPSR = reg[16].I & 0x40;
    if (N_FLAG)
        CPSR |= 0x80000000;
    if (Z_FLAG)
        CPSR |= 0x40000000;
    if (C_FLAG)
        CPSR |= 0x20000000;
    if (V_FLAG)
        CPSR |= 0x10000000;
    if (!armState)
        CPSR |= 0x00000020;
    if (!armIrqEnable)
        CPSR |= 0x80;
    CPSR |= (armMode & 0x1F);
    reg[16].I = CPSR;
}

void CPUUpdateFlags(bool breakLoop)
{
    uint32_t CPSR = reg[16].I;

    N_FLAG = (CPSR & 0x80000000) ? true : false;
    Z_FLAG = (CPSR & 0x40000000) ? true : false;
    C_FLAG = (CPSR & 0x20000000) ? true : false;
    V_FLAG = (CPSR & 0x10000000) ? true : false;
    armState = (CPSR & 0x20) ? false : true;
    armIrqEnable = (CPSR & 0x80) ? false : true;
    if (breakLoop) {
        if (armIrqEnable && (IF & IE) && (IME & 1))
            cpuNextEvent = cpuTotalTicks;
    }
}

void CPUUpdateFlags()
{
    CPUUpdateFlags(true);
}

#ifdef WORDS_BIGENDIAN
static void CPUSwap(volatile uint32_t* a, volatile uint32_t* b)
{
    volatile uint32_t c = *b;
    *b = *a;
    *a = c;
}
#else
static void CPUSwap(uint32_t* a, uint32_t* b)
{
    uint32_t c = *b;
    *b = *a;
    *a = c;
}
#endif

void CPUSwitchMode(int mode, bool saveState, bool breakLoop)
{
    //  if(armMode == mode)
    //    return;

    CPUUpdateCPSR();

    switch (armMode) {
    case 0x10:
    case 0x1F:
        reg[R13_USR].I = reg[13].I;
        reg[R14_USR].I = reg[14].I;
        reg[17].I = reg[16].I;
        break;
    case 0x11:
        CPUSwap(&reg[R8_FIQ].I, &reg[8].I);
        CPUSwap(&reg[R9_FIQ].I, &reg[9].I);
        CPUSwap(&reg[R10_FIQ].I, &reg[10].I);
        CPUSwap(&reg[R11_FIQ].I, &reg[11].I);
        CPUSwap(&reg[R12_FIQ].I, &reg[12].I);
        reg[R13_FIQ].I = reg[13].I;
        reg[R14_FIQ].I = reg[14].I;
        reg[SPSR_FIQ].I = reg[17].I;
        break;
    case 0x12:
        reg[R13_IRQ].I = reg[13].I;
        reg[R14_IRQ].I = reg[14].I;
        reg[SPSR_IRQ].I = reg[17].I;
        break;
    case 0x13:
        reg[R13_SVC].I = reg[13].I;
        reg[R14_SVC].I = reg[14].I;
        reg[SPSR_SVC].I = reg[17].I;
        break;
    case 0x17:
        reg[R13_ABT].I = reg[13].I;
        reg[R14_ABT].I = reg[14].I;
        reg[SPSR_ABT].I = reg[17].I;
        break;
    case 0x1b:
        reg[R13_UND].I = reg[13].I;
        reg[R14_UND].I = reg[14].I;
        reg[SPSR_UND].I = reg[17].I;
        break;
    }

    uint32_t CPSR = reg[16].I;
    uint32_t SPSR = reg[17].I;

    switch (mode) {
    case 0x10:
    case 0x1F:
        reg[13].I = reg[R13_USR].I;
        reg[14].I = reg[R14_USR].I;
        reg[16].I = SPSR;
        break;
    case 0x11:
        CPUSwap(&reg[8].I, &reg[R8_FIQ].I);
        CPUSwap(&reg[9].I, &reg[R9_FIQ].I);
        CPUSwap(&reg[10].I, &reg[R10_FIQ].I);
        CPUSwap(&reg[11].I, &reg[R11_FIQ].I);
        CPUSwap(&reg[12].I, &reg[R12_FIQ].I);
        reg[13].I = reg[R13_FIQ].I;
        reg[14].I = reg[R14_FIQ].I;
        reg[16].I = SPSR;
        if (saveState)
            reg[17].I = CPSR;
        else
            reg[17].I = reg[SPSR_FIQ].I;
        break;
    case 0x12:
        reg[13].I = reg[R13_IRQ].I;
        reg[14].I = reg[R14_IRQ].I;
        reg[16].I = SPSR;
        if (saveState)
            reg[17].I = CPSR;
        else
            reg[17].I = reg[SPSR_IRQ].I;
        break;
    case 0x13:
        reg[13].I = reg[R13_SVC].I;
        reg[14].I = reg[R14_SVC].I;
        reg[16].I = SPSR;
        if (saveState)
            reg[17].I = CPSR;
        else
            reg[17].I = reg[SPSR_SVC].I;
        break;
    case 0x17:
        reg[13].I = reg[R13_ABT].I;
        reg[14].I = reg[R14_ABT].I;
        reg[16].I = SPSR;
        if (saveState)
            reg[17].I = CPSR;
        else
            reg[17].I = reg[SPSR_ABT].I;
        break;
    case 0x1b:
        reg[13].I = reg[R13_UND].I;
        reg[14].I = reg[R14_UND].I;
        reg[16].I = SPSR;
        if (saveState)
            reg[17].I = CPSR;
        else
            reg[17].I = reg[SPSR_UND].I;
        break;
    default:
        systemMessage(MSG_UNSUPPORTED_ARM_MODE, N_("Unsupported ARM mode %02x"), mode);
        break;
    }
    armMode = mode;
    CPUUpdateFlags(breakLoop);
    CPUUpdateCPSR();
}

void CPUSwitchMode(int mode, bool saveState)
{
    CPUSwitchMode(mode, saveState, true);
}

void CPUUndefinedException()
{
    uint32_t PC = reg[15].I;
    bool savedArmState = armState;
    CPUSwitchMode(0x1b, true, false);
    reg[14].I = PC - (savedArmState ? 4 : 2);
    reg[15].I = 0x04;
    armState = true;
    armIrqEnable = false;
    armNextPC = 0x04;
    ARM_PREFETCH;
    reg[15].I += 4;
}

void CPUSoftwareInterrupt()
{
    uint32_t PC = reg[15].I;
    bool savedArmState = armState;
    CPUSwitchMode(0x13, true, false);
    reg[14].I = PC - (savedArmState ? 4 : 2);
    reg[15].I = 0x08;
    armState = true;
    armIrqEnable = false;
    armNextPC = 0x08;
    ARM_PREFETCH;
    reg[15].I += 4;
}

void CPUSoftwareInterrupt(int comment)
{
    static bool disableMessage = false;
    if (armState)
        comment >>= 16;
#ifdef VBAM_ENABLE_DEBUGGER
    if (comment == 0xff) {
        dbgOutput(NULL, reg[0].I);
        return;
    }
#endif
#ifdef PROFILING
    if (comment == 0xfe) {
        profStartup(reg[0].I, reg[1].I);
        return;
    }
    if (comment == 0xfd) {
        profControl(reg[0].I);
        return;
    }
    if (comment == 0xfc) {
        profCleanup();
        return;
    }
    if (comment == 0xfb) {
        profCount();
        return;
    }
#endif
    if (comment == 0xfa) {
        agbPrintFlush();
        return;
    }
#ifdef SDL
    if (comment == 0xf9) {
        emulating = 0;
        cpuNextEvent = cpuTotalTicks;
        cpuBreakLoop = true;
        return;
    }
#endif
    if (coreOptions.useBios) {
#ifdef GBA_LOGGING
        if (systemVerbose & VERBOSE_SWI) {
            log("SWI: %08x at %08x (0x%08x,0x%08x,0x%08x,VCOUNT = %2d)\n", comment,
                armState ? armNextPC - 4 : armNextPC - 2,
                reg[0].I,
                reg[1].I,
                reg[2].I,
                VCOUNT);
        }
#endif
        if ((comment & 0xF8) != 0xE0) {
            CPUSoftwareInterrupt();
            return;
        } else {
            if (CheckEReaderRegion())
                BIOS_EReader_ScanCard(comment);
            else
                CPUSoftwareInterrupt();
            return;
        }
    }
    // This would be correct, but it causes problems if uncommented
    //  else {
    //    biosProtected = 0xe3a02004;
    //  }

    switch (comment) {
    case 0x00:
        BIOS_SoftReset();
        ARM_PREFETCH;
        break;
    case 0x01:
        BIOS_RegisterRamReset();
        break;
    case 0x02:
#ifdef GBA_LOGGING
        if (systemVerbose & VERBOSE_SWI) {
            log("Halt: (VCOUNT = %2d)\n",
                VCOUNT);
        }
#endif
        holdState = true;
        holdType = -1;
        cpuNextEvent = cpuTotalTicks;
        break;
    case 0x03:
#ifdef GBA_LOGGING
        if (systemVerbose & VERBOSE_SWI) {
            log("Stop: (VCOUNT = %2d)\n",
                VCOUNT);
        }
#endif
        holdState = true;
        holdType = -1;
        stopState = true;
        cpuNextEvent = cpuTotalTicks;
        break;
    case 0x04:
#ifdef GBA_LOGGING
        if (systemVerbose & VERBOSE_SWI) {
            log("IntrWait: 0x%08x,0x%08x (VCOUNT = %2d)\n",
                reg[0].I,
                reg[1].I,
                VCOUNT);
        }
#endif
        CPUSoftwareInterrupt();
        break;
    case 0x05:
#ifdef GBA_LOGGING
        if (systemVerbose & VERBOSE_SWI) {
            log("VBlankIntrWait: (VCOUNT = %2d)\n",
                VCOUNT);
        }
#endif
        CPUSoftwareInterrupt();
        break;
    case 0x06:
        CPUSoftwareInterrupt();
        break;
    case 0x07:
        CPUSoftwareInterrupt();
        break;
    case 0x08:
        BIOS_Sqrt();
        break;
    case 0x09:
        BIOS_ArcTan();
        break;
    case 0x0A:
        BIOS_ArcTan2();
        break;
    case 0x0B: {
        int len = (reg[2].I & 0x1FFFFF) >> 1;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + len) & 0xe000000) == 0)) {
            if ((reg[2].I >> 24) & 1) {
                if ((reg[2].I >> 26) & 1)
                    SWITicks = (7 + memoryWait32[(reg[1].I >> 24) & 0xF]) * (len >> 1);
                else
                    SWITicks = (8 + memoryWait[(reg[1].I >> 24) & 0xF]) * (len);
            } else {
                if ((reg[2].I >> 26) & 1)
                    SWITicks = (10 + memoryWait32[(reg[0].I >> 24) & 0xF] + memoryWait32[(reg[1].I >> 24) & 0xF]) * (len >> 1);
                else
                    SWITicks = (11 + memoryWait[(reg[0].I >> 24) & 0xF] + memoryWait[(reg[1].I >> 24) & 0xF]) * len;
            }
        }
    }
        BIOS_CpuSet();
        break;
    case 0x0C: {
        int len = (reg[2].I & 0x1FFFFF) >> 5;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + len) & 0xe000000) == 0)) {
            if ((reg[2].I >> 24) & 1)
                SWITicks = (6 + memoryWait32[(reg[1].I >> 24) & 0xF] + 7 * (memoryWaitSeq32[(reg[1].I >> 24) & 0xF] + 1)) * len;
            else
                SWITicks = (9 + memoryWait32[(reg[0].I >> 24) & 0xF] + memoryWait32[(reg[1].I >> 24) & 0xF] + 7 * (memoryWaitSeq32[(reg[0].I >> 24) & 0xF] + memoryWaitSeq32[(reg[1].I >> 24) & 0xF] + 2)) * len;
        }
    }
        BIOS_CpuFastSet();
        break;
    case 0x0D:
        BIOS_GetBiosChecksum();
        break;
    case 0x0E:
        BIOS_BgAffineSet();
        break;
    case 0x0F:
        BIOS_ObjAffineSet();
        break;
    case 0x10: {
        int len = CPUReadHalfWord(reg[2].I);
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + len) & 0xe000000) == 0))
            SWITicks = (32 + memoryWait[(reg[0].I >> 24) & 0xF]) * len;
    }
        BIOS_BitUnPack();
        break;
    case 0x11: {
        uint32_t len = CPUReadMemory(reg[0].I) >> 8;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + (len & 0x1fffff)) & 0xe000000) == 0))
            SWITicks = (9 + memoryWait[(reg[1].I >> 24) & 0xF]) * len;
    }
        BIOS_LZ77UnCompWram();
        break;
    case 0x12: {
        uint32_t len = CPUReadMemory(reg[0].I) >> 8;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + (len & 0x1fffff)) & 0xe000000) == 0))
            SWITicks = (19 + memoryWait[(reg[1].I >> 24) & 0xF]) * len;
    }
        BIOS_LZ77UnCompVram();
        break;
    case 0x13: {
        uint32_t len = CPUReadMemory(reg[0].I) >> 8;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + (len & 0x1fffff)) & 0xe000000) == 0))
            SWITicks = (29 + (memoryWait[(reg[0].I >> 24) & 0xF] << 1)) * len;
    }
        BIOS_HuffUnComp();
        break;
    case 0x14: {
        uint32_t len = CPUReadMemory(reg[0].I) >> 8;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + (len & 0x1fffff)) & 0xe000000) == 0))
            SWITicks = (11 + memoryWait[(reg[0].I >> 24) & 0xF] + memoryWait[(reg[1].I >> 24) & 0xF]) * len;
    }
        BIOS_RLUnCompWram();
        break;
    case 0x15: {
        uint32_t len = CPUReadMemory(reg[0].I) >> 9;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + (len & 0x1fffff)) & 0xe000000) == 0))
            SWITicks = (34 + (memoryWait[(reg[0].I >> 24) & 0xF] << 1) + memoryWait[(reg[1].I >> 24) & 0xF]) * len;
    }
        BIOS_RLUnCompVram();
        break;
    case 0x16: {
        uint32_t len = CPUReadMemory(reg[0].I) >> 8;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + (len & 0x1fffff)) & 0xe000000) == 0))
            SWITicks = (13 + memoryWait[(reg[0].I >> 24) & 0xF] + memoryWait[(reg[1].I >> 24) & 0xF]) * len;
    }
        BIOS_Diff8bitUnFilterWram();
        break;
    case 0x17: {
        uint32_t len = CPUReadMemory(reg[0].I) >> 9;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + (len & 0x1fffff)) & 0xe000000) == 0))
            SWITicks = (39 + (memoryWait[(reg[0].I >> 24) & 0xF] << 1) + memoryWait[(reg[1].I >> 24) & 0xF]) * len;
    }
        BIOS_Diff8bitUnFilterVram();
        break;
    case 0x18: {
        uint32_t len = CPUReadMemory(reg[0].I) >> 9;
        if (!(((reg[0].I & 0xe000000) == 0) || ((reg[0].I + (len & 0x1fffff)) & 0xe000000) == 0))
            SWITicks = (13 + memoryWait[(reg[0].I >> 24) & 0xF] + memoryWait[(reg[1].I >> 24) & 0xF]) * len;
    }
        BIOS_Diff16bitUnFilter();
        break;
    case 0x19:
#ifdef GBA_LOGGING
        if (systemVerbose & VERBOSE_SWI) {
            log("SoundBiasSet: 0x%08x (VCOUNT = %2d)\n",
                reg[0].I,
                VCOUNT);
        }
#endif
        if (reg[0].I)
            soundPause();
        else
            soundResume();
        break;
    case 0x1A:
        BIOS_SndDriverInit();
        SWITicks = 252000;
        break;
    case 0x1B:
        BIOS_SndDriverMode();
        SWITicks = 280000;
        break;
    case 0x1C:
        BIOS_SndDriverMain();
        SWITicks = 11050; //avg
        break;
    case 0x1D:
        BIOS_SndDriverVSync();
        SWITicks = 44;
        break;
    case 0x1E:
        BIOS_SndChannelClear();
        break;
    case 0x1F:
        BIOS_MidiKey2Freq();
        break;
    case 0x28:
        BIOS_SndDriverVSyncOff();
        break;
    case 0x29:
        BIOS_SndDriverVSyncOn();
        break;
    case 0xE0:
    case 0xE1:
    case 0xE2:
    case 0xE3:
    case 0xE4:
    case 0xE5:
    case 0xE6:
    case 0xE7:
        if (CheckEReaderRegion())
            BIOS_EReader_ScanCard(comment);
        break;
    case 0x2A:
        BIOS_SndDriverJmpTableCopy();
        // let it go, because we don't really emulate this function
	/* fallthrough */
    default:
#ifdef GBA_LOGGING
        if (systemVerbose & VERBOSE_SWI) {
            log("SWI: %08x at %08x (0x%08x,0x%08x,0x%08x,VCOUNT = %2d)\n", comment,
                armState ? armNextPC - 4 : armNextPC - 2,
                reg[0].I,
                reg[1].I,
                reg[2].I,
                VCOUNT);
        }
#endif

        if (!disableMessage) {
            systemMessage(MSG_UNSUPPORTED_BIOS_FUNCTION,
                N_("Unsupported BIOS function %02x called from %08x. A BIOS file is needed in order to get correct behaviour."),
                comment,
                armMode ? armNextPC - 4 : armNextPC - 2);
            disableMessage = true;
        }
        break;
    }
}

void CPUCompareVCOUNT()
{
    if (VCOUNT == (DISPSTAT >> 8)) {
        DISPSTAT |= 4;
        UPDATE_REG(0x04, DISPSTAT);

        if (DISPSTAT & 0x20) {
            IF |= 4;
            UPDATE_REG(0x202, IF);
        }
    } else {
        DISPSTAT &= 0xFFFB;
        UPDATE_REG(0x4, DISPSTAT);
    }
    if (layerEnableDelay > 0) {
        layerEnableDelay--;
        if (layerEnableDelay == 1)
            coreOptions.layerEnable = coreOptions.layerSettings & DISPCNT;
    }
}

void doDMA(uint32_t& s, uint32_t& d, uint32_t si, uint32_t di, uint32_t c, int transfer32)
{
    int sm = s >> 24;
    int dm = d >> 24;
    int sw = 0;
    int dw = 0;
    int sc = c;

    cpuDmaRunning = true;
    cpuDmaPC = reg[15].I;
    cpuDmaCount = c;
    // This is done to get the correct waitstates.
    if (sm > 15)
        sm = 15;
    if (dm > 15)
        dm = 15;

    //if ((sm>=0x05) && (sm<=0x07) || (dm>=0x05) && (dm <=0x07))
    //    blank = (((DISPSTAT | ((DISPSTAT>>1)&1))==1) ?  true : false);

    if (transfer32) {
        s &= 0xFFFFFFFC;
        if (s < 0x02000000 && (reg[15].I >> 24)) {
            while (c != 0) {
                CPUWriteMemory(d, 0);
                d += di;
                c--;
            }
        } else {
            while (c != 0) {
                cpuDmaLast = CPUReadMemory(s);
                CPUWriteMemory(d, cpuDmaLast);
                d += di;
                s += si;
                c--;
            }
        }
    } else {
        s &= 0xFFFFFFFE;
        si = (int)si >> 1;
        di = (int)di >> 1;
        if (s < 0x02000000 && (reg[15].I >> 24)) {
            while (c != 0) {
                CPUWriteHalfWord(d, 0);
                d += di;
                c--;
            }
        } else {
            while (c != 0) {
                cpuDmaLast = CPUReadHalfWord(s);
                CPUWriteHalfWord(d, DowncastU16(cpuDmaLast));
                cpuDmaLast |= (cpuDmaLast << 16);
                d += di;
                s += si;
                c--;
            }
        }
    }

    cpuDmaCount = 0;

    int totalTicks = 0;

    if (transfer32) {
        sw = 1 + memoryWaitSeq32[sm & 15];
        dw = 1 + memoryWaitSeq32[dm & 15];
        totalTicks = (sw + dw) * (sc - 1) + 6 + memoryWait32[sm & 15] + memoryWaitSeq32[dm & 15];
    } else {
        sw = 1 + memoryWaitSeq[sm & 15];
        dw = 1 + memoryWaitSeq[dm & 15];
        totalTicks = (sw + dw) * (sc - 1) + 6 + memoryWait[sm & 15] + memoryWaitSeq[dm & 15];
    }

    cpuDmaTicksToUpdate += totalTicks;
    cpuDmaRunning = false;
}

void CPUCheckDMA(int reason, int dmamask)
{
    // DMA 0
    if ((DM0CNT_H & 0x8000) && (dmamask & 1)) {
        if (((DM0CNT_H >> 12) & 3) == reason) {
            uint32_t sourceIncrement = 4;
            uint32_t destIncrement = 4;
            switch ((DM0CNT_H >> 7) & 3) {
            case 0:
                break;
            case 1:
                sourceIncrement = (uint32_t)-4;
                break;
            case 2:
                sourceIncrement = 0;
                break;
            }
            switch ((DM0CNT_H >> 5) & 3) {
            case 0:
                break;
            case 1:
                destIncrement = (uint32_t)-4;
                break;
            case 2:
                destIncrement = 0;
                break;
            }
#ifdef GBA_LOGGING
            if (systemVerbose & VERBOSE_DMA0) {
                int count = (DM0CNT_L ? DM0CNT_L : 0x4000) << 1;
                if (DM0CNT_H & 0x0400)
                    count <<= 1;
                log("DMA0: s=%08x d=%08x c=%04x count=%08x\n", dma0Source, dma0Dest,
                    DM0CNT_H,
                    count);
            }
#endif
            doDMA(dma0Source, dma0Dest, sourceIncrement, destIncrement,
                DM0CNT_L ? DM0CNT_L : 0x4000,
                DM0CNT_H & 0x0400);

            if (DM0CNT_H & 0x4000) {
                IF |= 0x0100;
                UPDATE_REG(0x202, IF);
                cpuNextEvent = cpuTotalTicks;
            }

            if (((DM0CNT_H >> 5) & 3) == 3) {
                dma0Dest = DM0DAD_L | (DM0DAD_H << 16);
            }

            if (!(DM0CNT_H & 0x0200) || (reason == 0)) {
                DM0CNT_H &= 0x7FFF;
                UPDATE_REG(0xBA, DM0CNT_H);
            }
        }
    }

    // DMA 1
    if ((DM1CNT_H & 0x8000) && (dmamask & 2)) {
        if (((DM1CNT_H >> 12) & 3) == reason) {
            uint32_t sourceIncrement = 4;
            uint32_t destIncrement = 4;
            switch ((DM1CNT_H >> 7) & 3) {
            case 0:
                break;
            case 1:
                sourceIncrement = (uint32_t)-4;
                break;
            case 2:
                sourceIncrement = 0;
                break;
            }
            switch ((DM1CNT_H >> 5) & 3) {
            case 0:
                break;
            case 1:
                destIncrement = (uint32_t)-4;
                break;
            case 2:
                destIncrement = 0;
                break;
            }
            if (reason == 3) {
#ifdef GBA_LOGGING
                if (systemVerbose & VERBOSE_DMA1) {
                    log("DMA1: s=%08x d=%08x c=%04x count=%08x\n", dma1Source, dma1Dest,
                        DM1CNT_H,
                        16);
                }
#endif
                doDMA(dma1Source, dma1Dest, sourceIncrement, 0, 4,
                    0x0400);
            } else {
#ifdef GBA_LOGGING
                if (systemVerbose & VERBOSE_DMA1) {
                    int count = (DM1CNT_L ? DM1CNT_L : 0x4000) << 1;
                    if (DM1CNT_H & 0x0400)
                        count <<= 1;
                    log("DMA1: s=%08x d=%08x c=%04x count=%08x\n", dma1Source, dma1Dest,
                        DM1CNT_H,
                        count);
                }
#endif
                doDMA(dma1Source, dma1Dest, sourceIncrement, destIncrement,
                    DM1CNT_L ? DM1CNT_L : 0x4000,
                    DM1CNT_H & 0x0400);
            }

            if (DM1CNT_H & 0x4000) {
                IF |= 0x0200;
                UPDATE_REG(0x202, IF);
                cpuNextEvent = cpuTotalTicks;
            }

            if (((DM1CNT_H >> 5) & 3) == 3) {
                dma1Dest = DM1DAD_L | (DM1DAD_H << 16);
            }

            if (!(DM1CNT_H & 0x0200) || (reason == 0)) {
                DM1CNT_H &= 0x7FFF;
                UPDATE_REG(0xC6, DM1CNT_H);
            }
        }
    }

    // DMA 2
    if ((DM2CNT_H & 0x8000) && (dmamask & 4)) {
        if (((DM2CNT_H >> 12) & 3) == reason) {
            uint32_t sourceIncrement = 4;
            uint32_t destIncrement = 4;
            switch ((DM2CNT_H >> 7) & 3) {
            case 0:
                break;
            case 1:
                sourceIncrement = (uint32_t)-4;
                break;
            case 2:
                sourceIncrement = 0;
                break;
            }
            switch ((DM2CNT_H >> 5) & 3) {
            case 0:
                break;
            case 1:
                destIncrement = (uint32_t)-4;
                break;
            case 2:
                destIncrement = 0;
                break;
            }
            if (reason == 3) {
#ifdef GBA_LOGGING
                if (systemVerbose & VERBOSE_DMA2) {
                    int count = (4) << 2;
                    log("DMA2: s=%08x d=%08x c=%04x count=%08x\n", dma2Source, dma2Dest,
                        DM2CNT_H,
                        count);
                }
#endif
                doDMA(dma2Source, dma2Dest, sourceIncrement, 0, 4,
                    0x0400);
            } else {
#ifdef GBA_LOGGING
                if (systemVerbose & VERBOSE_DMA2) {
                    int count = (DM2CNT_L ? DM2CNT_L : 0x4000) << 1;
                    if (DM2CNT_H & 0x0400)
                        count <<= 1;
                    log("DMA2: s=%08x d=%08x c=%04x count=%08x\n", dma2Source, dma2Dest,
                        DM2CNT_H,
                        count);
                }
#endif
                doDMA(dma2Source, dma2Dest, sourceIncrement, destIncrement,
                    DM2CNT_L ? DM2CNT_L : 0x4000,
                    DM2CNT_H & 0x0400);
            }

            if (DM2CNT_H & 0x4000) {
                IF |= 0x0400;
                UPDATE_REG(0x202, IF);
                cpuNextEvent = cpuTotalTicks;
            }

            if (((DM2CNT_H >> 5) & 3) == 3) {
                dma2Dest = DM2DAD_L | (DM2DAD_H << 16);
            }

            if (!(DM2CNT_H & 0x0200) || (reason == 0)) {
                DM2CNT_H &= 0x7FFF;
                UPDATE_REG(0xD2, DM2CNT_H);
            }
        }
    }

    // DMA 3
    if ((DM3CNT_H & 0x8000) && (dmamask & 8)) {
        if (((DM3CNT_H >> 12) & 3) == reason) {
            uint32_t sourceIncrement = 4;
            uint32_t destIncrement = 4;
            switch ((DM3CNT_H >> 7) & 3) {
            case 0:
                break;
            case 1:
                sourceIncrement = (uint32_t)-4;
                break;
            case 2:
                sourceIncrement = 0;
                break;
            }
            switch ((DM3CNT_H >> 5) & 3) {
            case 0:
                break;
            case 1:
                destIncrement = (uint32_t)-4;
                break;
            case 2:
                destIncrement = 0;
                break;
            }
#ifdef GBA_LOGGING
            if (systemVerbose & VERBOSE_DMA3) {
                int count = (DM3CNT_L ? DM3CNT_L : 0x10000) << 1;
                if (DM3CNT_H & 0x0400)
                    count <<= 1;
                log("DMA3: s=%08x d=%08x c=%04x count=%08x\n", dma3Source, dma3Dest,
                    DM3CNT_H,
                    count);
            }
#endif
            doDMA(dma3Source, dma3Dest, sourceIncrement, destIncrement,
                DM3CNT_L ? DM3CNT_L : 0x10000,
                DM3CNT_H & 0x0400);

            if (DM3CNT_H & 0x4000) {
                IF |= 0x0800;
                UPDATE_REG(0x202, IF);
                cpuNextEvent = cpuTotalTicks;
            }

            if (((DM3CNT_H >> 5) & 3) == 3) {
                dma3Dest = DM3DAD_L | (DM3DAD_H << 16);
            }

            if (!(DM3CNT_H & 0x0200) || (reason == 0)) {
                DM3CNT_H &= 0x7FFF;
                UPDATE_REG(0xDE, DM3CNT_H);
            }
        }
    }
}

void CPUUpdateRegister(uint32_t address, uint16_t value)
{
    switch (address) {
    case 0x00: { // we need to place the following code in { } because we declare & initialize variables in a case statement
        if ((value & 7) > 5) {
            // display modes above 0-5 are prohibited
            DISPCNT = (value & 7);
        }
        bool change = (0 != ((DISPCNT ^ value) & 0x80));
        bool changeBG = (0 != ((DISPCNT ^ value) & 0x0F00));
        uint16_t changeBGon = ((~DISPCNT) & value) & 0x0F00; // these layers are being activated

        DISPCNT = (value & 0xFFF7); // bit 3 can only be accessed by the BIOS to enable GBC mode
        UPDATE_REG(0x00, DISPCNT);

        if (changeBGon) {
            layerEnableDelay = 4;
            coreOptions.layerEnable = coreOptions.layerSettings & value & (~changeBGon);
        } else {
            coreOptions.layerEnable = coreOptions.layerSettings & value;
            // CPUUpdateTicks();
        }

        windowOn = (coreOptions.layerEnable & 0x6000) ? true : false;
        if (change && !((value & 0x80))) {
            if (!(DISPSTAT & 1)) {
                //lcdTicks = 1008;
                //      VCOUNT = 0;
                //      UPDATE_REG(0x06, VCOUNT);
                DISPSTAT &= 0xFFFC;
                UPDATE_REG(0x04, DISPSTAT);
                CPUCompareVCOUNT();
            }
            //        (*renderLine)();
        }
        CPUUpdateRender();
        // we only care about changes in BG0-BG3
        if (changeBG) {
            CPUUpdateRenderBuffers(false);
        }
        break;
    }
    case 0x04:
        DISPSTAT = (value & 0xFF38) | (DISPSTAT & 7);
        UPDATE_REG(0x04, DISPSTAT);
        break;
    case 0x06:
        // not writable
        break;
    case 0x08:
        BG0CNT = (value & 0xDFCF);
        UPDATE_REG(0x08, BG0CNT);
        break;
    case 0x0A:
        BG1CNT = (value & 0xDFCF);
        UPDATE_REG(0x0A, BG1CNT);
        break;
    case 0x0C:
        BG2CNT = (value & 0xFFCF);
        UPDATE_REG(0x0C, BG2CNT);
        break;
    case 0x0E:
        BG3CNT = (value & 0xFFCF);
        UPDATE_REG(0x0E, BG3CNT);
        break;
    case 0x10:
        BG0HOFS = value & 511;
        UPDATE_REG(0x10, BG0HOFS);
        break;
    case 0x12:
        BG0VOFS = value & 511;
        UPDATE_REG(0x12, BG0VOFS);
        break;
    case 0x14:
        BG1HOFS = value & 511;
        UPDATE_REG(0x14, BG1HOFS);
        break;
    case 0x16:
        BG1VOFS = value & 511;
        UPDATE_REG(0x16, BG1VOFS);
        break;
    case 0x18:
        BG2HOFS = value & 511;
        UPDATE_REG(0x18, BG2HOFS);
        break;
    case 0x1A:
        BG2VOFS = value & 511;
        UPDATE_REG(0x1A, BG2VOFS);
        break;
    case 0x1C:
        BG3HOFS = value & 511;
        UPDATE_REG(0x1C, BG3HOFS);
        break;
    case 0x1E:
        BG3VOFS = value & 511;
        UPDATE_REG(0x1E, BG3VOFS);
        break;
    case 0x20:
        BG2PA = value;
        UPDATE_REG(0x20, BG2PA);
        break;
    case 0x22:
        BG2PB = value;
        UPDATE_REG(0x22, BG2PB);
        break;
    case 0x24:
        BG2PC = value;
        UPDATE_REG(0x24, BG2PC);
        break;
    case 0x26:
        BG2PD = value;
        UPDATE_REG(0x26, BG2PD);
        break;
    case 0x28:
        BG2X_L = value;
        UPDATE_REG(0x28, BG2X_L);
        gfxBG2Changed |= 1;
        break;
    case 0x2A:
        BG2X_H = (value & 0xFFF);
        UPDATE_REG(0x2A, BG2X_H);
        gfxBG2Changed |= 1;
        break;
    case 0x2C:
        BG2Y_L = value;
        UPDATE_REG(0x2C, BG2Y_L);
        gfxBG2Changed |= 2;
        break;
    case 0x2E:
        BG2Y_H = value & 0xFFF;
        UPDATE_REG(0x2E, BG2Y_H);
        gfxBG2Changed |= 2;
        break;
    case 0x30:
        BG3PA = value;
        UPDATE_REG(0x30, BG3PA);
        break;
    case 0x32:
        BG3PB = value;
        UPDATE_REG(0x32, BG3PB);
        break;
    case 0x34:
        BG3PC = value;
        UPDATE_REG(0x34, BG3PC);
        break;
    case 0x36:
        BG3PD = value;
        UPDATE_REG(0x36, BG3PD);
        break;
    case 0x38:
        BG3X_L = value;
        UPDATE_REG(0x38, BG3X_L);
        gfxBG3Changed |= 1;
        break;
    case 0x3A:
        BG3X_H = value & 0xFFF;
        UPDATE_REG(0x3A, BG3X_H);
        gfxBG3Changed |= 1;
        break;
    case 0x3C:
        BG3Y_L = value;
        UPDATE_REG(0x3C, BG3Y_L);
        gfxBG3Changed |= 2;
        break;
    case 0x3E:
        BG3Y_H = value & 0xFFF;
        UPDATE_REG(0x3E, BG3Y_H);
        gfxBG3Changed |= 2;
        break;
    case 0x40:
        WIN0H = value;
        UPDATE_REG(0x40, WIN0H);
        CPUUpdateWindow0();
        break;
    case 0x42:
        WIN1H = value;
        UPDATE_REG(0x42, WIN1H);
        CPUUpdateWindow1();
        break;
    case 0x44:
        WIN0V = value;
        UPDATE_REG(0x44, WIN0V);
        break;
    case 0x46:
        WIN1V = value;
        UPDATE_REG(0x46, WIN1V);
        break;
    case 0x48:
        WININ = value & 0x3F3F;
        UPDATE_REG(0x48, WININ);
        break;
    case 0x4A:
        WINOUT = value & 0x3F3F;
        UPDATE_REG(0x4A, WINOUT);
        break;
    case 0x4C:
        MOSAIC = value;
        UPDATE_REG(0x4C, MOSAIC);
        break;
    case 0x50:
        BLDMOD = value & 0x3FFF;
        UPDATE_REG(0x50, BLDMOD);
        fxOn = ((BLDMOD >> 6) & 3) != 0;
        CPUUpdateRender();
        break;
    case 0x52:
        COLEV = value & 0x1F1F;
        UPDATE_REG(0x52, COLEV);
        break;
    case 0x54:
        COLY = value & 0x1F;
        UPDATE_REG(0x54, COLY);
        break;
    case 0x60:
    case 0x62:
    case 0x64:
    case 0x68:
    case 0x6c:
    case 0x70:
    case 0x72:
    case 0x74:
    case 0x78:
    case 0x7c:
    case 0x80:
    case 0x84:
        soundEvent8(address & 0xFF, (uint8_t)(value & 0xFF));
        soundEvent8((address & 0xFF) + 1, (uint8_t)(value >> 8));
        break;
    case 0x82:
    case 0x88:
    case 0xa0:
    case 0xa2:
    case 0xa4:
    case 0xa6:
    case 0x90:
    case 0x92:
    case 0x94:
    case 0x96:
    case 0x98:
    case 0x9a:
    case 0x9c:
    case 0x9e:
        soundEvent16(address & 0xFF, value);
        break;
    case 0xB0:
        DM0SAD_L = value;
        UPDATE_REG(0xB0, DM0SAD_L);
        break;
    case 0xB2:
        DM0SAD_H = value & 0x07FF;
        UPDATE_REG(0xB2, DM0SAD_H);
        break;
    case 0xB4:
        DM0DAD_L = value;
        UPDATE_REG(0xB4, DM0DAD_L);
        break;
    case 0xB6:
        DM0DAD_H = value & 0x07FF;
        UPDATE_REG(0xB6, DM0DAD_H);
        break;
    case 0xB8:
        DM0CNT_L = value & 0x3FFF;
        UPDATE_REG(0xB8, 0);
        break;
    case 0xBA: {
        bool start = ((DM0CNT_H ^ value) & 0x8000) ? true : false;
        value &= 0xF7E0;

        DM0CNT_H = value;
        UPDATE_REG(0xBA, DM0CNT_H);

        if (start && (value & 0x8000)) {
            dma0Source = DM0SAD_L | (DM0SAD_H << 16);
            dma0Dest = DM0DAD_L | (DM0DAD_H << 16);
            CPUCheckDMA(0, 1);
        }
    } break;
    case 0xBC:
        DM1SAD_L = value;
        UPDATE_REG(0xBC, DM1SAD_L);
        break;
    case 0xBE:
        DM1SAD_H = value & 0x0FFF;
        UPDATE_REG(0xBE, DM1SAD_H);
        break;
    case 0xC0:
        DM1DAD_L = value;
        UPDATE_REG(0xC0, DM1DAD_L);
        break;
    case 0xC2:
        DM1DAD_H = value & 0x07FF;
        UPDATE_REG(0xC2, DM1DAD_H);
        break;
    case 0xC4:
        DM1CNT_L = value & 0x3FFF;
        UPDATE_REG(0xC4, 0);
        break;
    case 0xC6: {
        bool start = ((DM1CNT_H ^ value) & 0x8000) ? true : false;
        value &= 0xF7E0;

        DM1CNT_H = value;
        UPDATE_REG(0xC6, DM1CNT_H);

        if (start && (value & 0x8000)) {
            dma1Source = DM1SAD_L | (DM1SAD_H << 16);
            dma1Dest = DM1DAD_L | (DM1DAD_H << 16);
            CPUCheckDMA(0, 2);
        }
    } break;
    case 0xC8:
        DM2SAD_L = value;
        UPDATE_REG(0xC8, DM2SAD_L);
        break;
    case 0xCA:
        DM2SAD_H = value & 0x0FFF;
        UPDATE_REG(0xCA, DM2SAD_H);
        break;
    case 0xCC:
        DM2DAD_L = value;
        UPDATE_REG(0xCC, DM2DAD_L);
        break;
    case 0xCE:
        DM2DAD_H = value & 0x07FF;
        UPDATE_REG(0xCE, DM2DAD_H);
        break;
    case 0xD0:
        DM2CNT_L = value & 0x3FFF;
        UPDATE_REG(0xD0, 0);
        break;
    case 0xD2: {
        bool start = ((DM2CNT_H ^ value) & 0x8000) ? true : false;

        value &= 0xF7E0;

        DM2CNT_H = value;
        UPDATE_REG(0xD2, DM2CNT_H);

        if (start && (value & 0x8000)) {
            dma2Source = DM2SAD_L | (DM2SAD_H << 16);
            dma2Dest = DM2DAD_L | (DM2DAD_H << 16);

            CPUCheckDMA(0, 4);
        }
    } break;
    case 0xD4:
        DM3SAD_L = value;
        UPDATE_REG(0xD4, DM3SAD_L);
        break;
    case 0xD6:
        DM3SAD_H = value & 0x0FFF;
        UPDATE_REG(0xD6, DM3SAD_H);
        break;
    case 0xD8:
        DM3DAD_L = value;
        UPDATE_REG(0xD8, DM3DAD_L);
        break;
    case 0xDA:
        DM3DAD_H = value & 0x0FFF;
        UPDATE_REG(0xDA, DM3DAD_H);
        break;
    case 0xDC:
        DM3CNT_L = value;
        UPDATE_REG(0xDC, 0);
        break;
    case 0xDE: {
        bool start = ((DM3CNT_H ^ value) & 0x8000) ? true : false;

        value &= 0xFFE0;

        DM3CNT_H = value;
        UPDATE_REG(0xDE, DM3CNT_H);

        if (start && (value & 0x8000)) {
            dma3Source = DM3SAD_L | (DM3SAD_H << 16);
            dma3Dest = DM3DAD_L | (DM3DAD_H << 16);
            CPUCheckDMA(0, 8);
        }
    } break;
    case 0x100:
        timer0Reload = value;
        interp_rate();
        break;
    case 0x102:
        timer0Value = value;
        timerOnOffDelay |= 1;
        cpuNextEvent = cpuTotalTicks;
        break;
    case 0x104:
        timer1Reload = value;
        interp_rate();
        break;
    case 0x106:
        timer1Value = value;
        timerOnOffDelay |= 2;
        cpuNextEvent = cpuTotalTicks;
        break;
    case 0x108:
        timer2Reload = value;
        break;
    case 0x10A:
        timer2Value = value;
        timerOnOffDelay |= 4;
        cpuNextEvent = cpuTotalTicks;
        break;
    case 0x10C:
        timer3Reload = value;
        break;
    case 0x10E:
        timer3Value = value;
        timerOnOffDelay |= 8;
        cpuNextEvent = cpuTotalTicks;
        break;

    case COMM_SIOCNT:
#ifndef NO_LINK
        StartLink(value);
#else
        if (!g_ioMem)
            return;

        if (value & 0x80) {
            value &= 0xff7f;
            if (value & 1 && (value & 0x4000)) {
                UPDATE_REG(COMM_SIOCNT, 0xFF);
                IF |= 0x80;
                UPDATE_REG(0x202, IF);
                value &= 0x7f7f;
            }
        }
        UPDATE_REG(COMM_SIOCNT, value);
#endif
        break;

#ifndef NO_LINK
    case COMM_SIODATA8:
        UPDATE_REG(COMM_SIODATA8, value);
        break;
#endif

    case 0x130:
        P1 |= (value & 0x3FF);
        UPDATE_REG(0x130, P1);
        break;

    case 0x132:
        UPDATE_REG(0x132, value & 0xC3FF);
        break;


    case COMM_RCNT:
#ifndef NO_LINK
        StartGPLink(value);
#else
        if (!g_ioMem)
            return;

        UPDATE_REG(COMM_RCNT, value);
#endif
        break;

#ifndef NO_LINK
    case COMM_JOYCNT: {
        uint16_t cur = READ16LE(&g_ioMem[COMM_JOYCNT]);

        if (value & JOYCNT_RESET)
            cur &= ~JOYCNT_RESET;
        if (value & JOYCNT_RECV_COMPLETE)
            cur &= ~JOYCNT_RECV_COMPLETE;
        if (value & JOYCNT_SEND_COMPLETE)
            cur &= ~JOYCNT_SEND_COMPLETE;
        if (value & JOYCNT_INT_ENABLE)
            cur |= JOYCNT_INT_ENABLE;

        UPDATE_REG(COMM_JOYCNT, cur);
    } break;

    case COMM_JOY_RECV_L:
        UPDATE_REG(COMM_JOY_RECV_L, value);
        break;
    case COMM_JOY_RECV_H:
        UPDATE_REG(COMM_JOY_RECV_H, value);
        break;

    case COMM_JOY_TRANS_L:
        UPDATE_REG(COMM_JOY_TRANS_L, value);
        UPDATE_REG(COMM_JOYSTAT, READ16LE(&g_ioMem[COMM_JOYSTAT]) | JOYSTAT_SEND);
        break;
    case COMM_JOY_TRANS_H:
        UPDATE_REG(COMM_JOY_TRANS_H, value);
        UPDATE_REG(COMM_JOYSTAT, READ16LE(&g_ioMem[COMM_JOYSTAT]) | JOYSTAT_SEND);
        break;

    case COMM_JOYSTAT:
        UPDATE_REG(COMM_JOYSTAT, (READ16LE(&g_ioMem[COMM_JOYSTAT]) & 0x0a) | (value & ~0x0a));
        break;
#endif

    case 0x200:
        IE = value & 0x3FFF;
        UPDATE_REG(0x200, IE);
        if ((IME & 1) && (IF & IE) && armIrqEnable)
            cpuNextEvent = cpuTotalTicks;
        break;
    case 0x202:
        IF ^= (value & IF);
        UPDATE_REG(0x202, IF);
        break;
    case 0x204: {
        memoryWait[0x0e] = memoryWaitSeq[0x0e] = gamepakRamWaitState[value & 3];

        if (!coreOptions.speedHack) {
            memoryWait[0x08] = memoryWait[0x09] = gamepakWaitState[(value >> 2) & 3];
            memoryWaitSeq[0x08] = memoryWaitSeq[0x09] = gamepakWaitState0[(value >> 4) & 1];

            memoryWait[0x0a] = memoryWait[0x0b] = gamepakWaitState[(value >> 5) & 3];
            memoryWaitSeq[0x0a] = memoryWaitSeq[0x0b] = gamepakWaitState1[(value >> 7) & 1];

            memoryWait[0x0c] = memoryWait[0x0d] = gamepakWaitState[(value >> 8) & 3];
            memoryWaitSeq[0x0c] = memoryWaitSeq[0x0d] = gamepakWaitState2[(value >> 10) & 1];
        } else {
            memoryWait[0x08] = memoryWait[0x09] = 3;
            memoryWaitSeq[0x08] = memoryWaitSeq[0x09] = 1;

            memoryWait[0x0a] = memoryWait[0x0b] = 3;
            memoryWaitSeq[0x0a] = memoryWaitSeq[0x0b] = 1;

            memoryWait[0x0c] = memoryWait[0x0d] = 3;
            memoryWaitSeq[0x0c] = memoryWaitSeq[0x0d] = 1;
        }

        for (int i = 8; i < 15; i++) {
            memoryWait32[i] = memoryWait[i] + memoryWaitSeq[i] + 1;
            memoryWaitSeq32[i] = memoryWaitSeq[i] * 2 + 1;
        }

        if ((value & 0x4000) == 0x4000) {
            busPrefetchEnable = true;
            busPrefetch = false;
            busPrefetchCount = 0;
        } else {
            busPrefetchEnable = false;
            busPrefetch = false;
            busPrefetchCount = 0;
        }
        UPDATE_REG(0x204, value & 0x7FFF);

    } break;
    case 0x208:
        IME = value & 1;
        UPDATE_REG(0x208, IME);
        if ((IME & 1) && (IF & IE) && armIrqEnable)
            cpuNextEvent = cpuTotalTicks;
        break;
    case 0x300:
        if (value != 0)
            value &= 0xFFFE;
        UPDATE_REG(0x300, value);
        break;
    default:
        UPDATE_REG(address & 0x3FE, value);
        break;
    }
}

void applyTimer()
{
    if (timerOnOffDelay & 1) {
        timer0ClockReload = TIMER_TICKS[timer0Value & 3];
        if (!timer0On && (timer0Value & 0x80)) {
            // reload the counter
            TM0D = DowncastU16(timer0Reload);
            timer0Ticks = (0x10000 - TM0D) << timer0ClockReload;
            UPDATE_REG(0x100, TM0D);
        }
        timer0On = timer0Value & 0x80 ? true : false;
        TM0CNT = timer0Value & 0xC7;
        interp_rate();
        UPDATE_REG(0x102, TM0CNT);
        //    CPUUpdateTicks();
    }
    if (timerOnOffDelay & 2) {
        timer1ClockReload = TIMER_TICKS[timer1Value & 3];
        if (!timer1On && (timer1Value & 0x80)) {
            // reload the counter
            TM1D = DowncastU16(timer1Reload);
            timer1Ticks = (0x10000 - TM1D) << timer1ClockReload;
            UPDATE_REG(0x104, TM1D);
        }
        timer1On = timer1Value & 0x80 ? true : false;
        TM1CNT = timer1Value & 0xC7;
        interp_rate();
        UPDATE_REG(0x106, TM1CNT);
    }
    if (timerOnOffDelay & 4) {
        timer2ClockReload = TIMER_TICKS[timer2Value & 3];
        if (!timer2On && (timer2Value & 0x80)) {
            // reload the counter
            TM2D = DowncastU16(timer2Reload);
            timer2Ticks = (0x10000 - TM2D) << timer2ClockReload;
            UPDATE_REG(0x108, TM2D);
        }
        timer2On = timer2Value & 0x80 ? true : false;
        TM2CNT = timer2Value & 0xC7;
        UPDATE_REG(0x10A, TM2CNT);
    }
    if (timerOnOffDelay & 8) {
        timer3ClockReload = TIMER_TICKS[timer3Value & 3];
        if (!timer3On && (timer3Value & 0x80)) {
            // reload the counter
            TM3D = DowncastU16(timer3Reload);
            timer3Ticks = (0x10000 - TM3D) << timer3ClockReload;
            UPDATE_REG(0x10C, TM3D);
        }
        timer3On = timer3Value & 0x80 ? true : false;
        TM3CNT = timer3Value & 0xC7;
        UPDATE_REG(0x10E, TM3CNT);
    }
    cpuNextEvent = CPUUpdateTicks();
    timerOnOffDelay = 0;
}

uint8_t cpuBitsSet[256];
uint8_t cpuLowestBitSet[256];

void CPUInit(const char* biosFileName, bool useBiosFile)
{
#ifdef WORDS_BIGENDIAN
    if (!cpuBiosSwapped) {
        for (unsigned int i = 0; i < sizeof(myROM) / 4; i++) {
            WRITE32LE(&myROM[i], myROM[i]);
        }
        cpuBiosSwapped = true;
    }
#endif
    eepromInUse = 0;
    coreOptions.useBios = false;

    if (useBiosFile && strlen(biosFileName) > 0) {
        int size = 0x4000;
        if (utilLoad(biosFileName,
                CPUIsGBABios,
                g_bios,
                size)) {
            if (size == 0x4000)
                coreOptions.useBios = true;
            else
                systemMessage(MSG_INVALID_BIOS_FILE_SIZE, N_("Invalid BIOS file size"));
        }
    }

    if (!coreOptions.useBios) {
        memcpy(g_bios, myROM, sizeof(myROM));
    }

    int i = 0;

    biosProtected[0] = 0x00;
    biosProtected[1] = 0xf0;
    biosProtected[2] = 0x29;
    biosProtected[3] = 0xe1;

    for (i = 0; i < 256; i++) {
        int count = 0;
        int j;
        for (j = 0; j < 8; j++)
            if (i & (1 << j))
                count++;
        cpuBitsSet[i] = DowncastU8(count);

        for (j = 0; j < 8; j++)
            if (i & (1 << j))
                break;
        cpuLowestBitSet[i] = DowncastU8(j);
    }

    for (i = 0; i < 0x400; i++)
        ioReadable[i] = true;
    for (i = 0x10; i < 0x48; i++)
        ioReadable[i] = false;
    for (i = 0x4c; i < 0x50; i++)
        ioReadable[i] = false;
    for (i = 0x54; i < 0x60; i++)
        ioReadable[i] = false;
    for (i = 0x8c; i < 0x90; i++)
        ioReadable[i] = false;
    for (i = 0xa0; i < 0xb8; i++)
        ioReadable[i] = false;
    for (i = 0xbc; i < 0xc4; i++)
        ioReadable[i] = false;
    for (i = 0xc8; i < 0xd0; i++)
        ioReadable[i] = false;
    for (i = 0xd4; i < 0xdc; i++)
        ioReadable[i] = false;
    for (i = 0xe0; i < 0x100; i++)
        ioReadable[i] = false;
    for (i = 0x110; i < 0x120; i++)
        ioReadable[i] = false;
    for (i = 0x12c; i < 0x130; i++)
        ioReadable[i] = false;
    for (i = 0x138; i < 0x140; i++)
        ioReadable[i] = false;
    for (i = 0x144; i < 0x150; i++)
        ioReadable[i] = false;
    for (i = 0x15c; i < 0x200; i++)
        ioReadable[i] = false;
    for (i = 0x20c; i < 0x300; i++)
        ioReadable[i] = false;
    for (i = 0x304; i < 0x400; i++)
        ioReadable[i] = false;

    if (romSize < 0x1fe2000) {
        *((uint16_t*)&g_rom[0x1fe209c]) = 0xdffa; // SWI 0xFA
        *((uint16_t*)&g_rom[0x1fe209e]) = 0x4770; // BX LR
    } else {
        agbPrintEnable(false);
    }
}

void SetSaveType(int st)
{
    switch (st) {
    case GBA_SAVE_AUTO:
        cpuSramEnabled = true;
        cpuFlashEnabled = true;
        cpuEEPROMEnabled = true;
        cpuEEPROMSensorEnabled = false;
        cpuSaveGameFunc = flashSaveDecide;
        break;
    case GBA_SAVE_EEPROM:
        cpuSramEnabled = false;
        cpuFlashEnabled = false;
        cpuEEPROMEnabled = true;
        cpuEEPROMSensorEnabled = false;
        break;
    case GBA_SAVE_SRAM:
        cpuSramEnabled = true;
        cpuFlashEnabled = false;
        cpuEEPROMEnabled = false;
        cpuEEPROMSensorEnabled = false;
        cpuSaveGameFunc = sramDelayedWrite; // to insure we detect the write
        break;
    case GBA_SAVE_FLASH:
        cpuSramEnabled = false;
        cpuFlashEnabled = true;
        cpuEEPROMEnabled = false;
        cpuEEPROMSensorEnabled = false;
        cpuSaveGameFunc = flashDelayedWrite; // to insure we detect the write
        break;
    case GBA_SAVE_EEPROM_SENSOR:
        cpuSramEnabled = false;
        cpuFlashEnabled = false;
        cpuEEPROMEnabled = true;
        cpuEEPROMSensorEnabled = true;
        break;
    case GBA_SAVE_NONE:
        cpuSramEnabled = false;
        cpuFlashEnabled = false;
        cpuEEPROMEnabled = false;
        cpuEEPROMSensorEnabled = false;
        break;
    }
}

void CPUReset()
{
    switch (CheckEReaderRegion()) {
    case 1: //US
        EReaderWriteMemory(0x8009134, 0x46C0DFE0);
        break;
    case 2:
        EReaderWriteMemory(0x8008A8C, 0x46C0DFE0);
        break;
    case 3:
        EReaderWriteMemory(0x80091A8, 0x46C0DFE0);
        break;
    }
    rtcReset();
    // clean registers
    memset(&reg[0], 0, sizeof(reg));
    // clean OAM
    memset(g_oam, 0, SIZE_OAM);
    // clean palette
    memset(g_paletteRAM, 0, SIZE_PRAM);
    // clean picture
    memset(g_pix, 0, SIZE_PIX);
    // clean g_vram
    memset(g_vram, 0, SIZE_VRAM);
    // clean io memory
    memset(g_ioMem, 0, SIZE_IOMEM);

    DISPCNT = 0x0080;
    DISPSTAT = 0x0000;
    VCOUNT = (coreOptions.useBios && !coreOptions.skipBios) ? 0 : 0x007E;
    BG0CNT = 0x0000;
    BG1CNT = 0x0000;
    BG2CNT = 0x0000;
    BG3CNT = 0x0000;
    BG0HOFS = 0x0000;
    BG0VOFS = 0x0000;
    BG1HOFS = 0x0000;
    BG1VOFS = 0x0000;
    BG2HOFS = 0x0000;
    BG2VOFS = 0x0000;
    BG3HOFS = 0x0000;
    BG3VOFS = 0x0000;
    BG2PA = 0x0100;
    BG2PB = 0x0000;
    BG2PC = 0x0000;
    BG2PD = 0x0100;
    BG2X_L = 0x0000;
    BG2X_H = 0x0000;
    BG2Y_L = 0x0000;
    BG2Y_H = 0x0000;
    BG3PA = 0x0100;
    BG3PB = 0x0000;
    BG3PC = 0x0000;
    BG3PD = 0x0100;
    BG3X_L = 0x0000;
    BG3X_H = 0x0000;
    BG3Y_L = 0x0000;
    BG3Y_H = 0x0000;
    WIN0H = 0x0000;
    WIN1H = 0x0000;
    WIN0V = 0x0000;
    WIN1V = 0x0000;
    WININ = 0x0000;
    WINOUT = 0x0000;
    MOSAIC = 0x0000;
    BLDMOD = 0x0000;
    COLEV = 0x0000;
    COLY = 0x0000;
    DM0SAD_L = 0x0000;
    DM0SAD_H = 0x0000;
    DM0DAD_L = 0x0000;
    DM0DAD_H = 0x0000;
    DM0CNT_L = 0x0000;
    DM0CNT_H = 0x0000;
    DM1SAD_L = 0x0000;
    DM1SAD_H = 0x0000;
    DM1DAD_L = 0x0000;
    DM1DAD_H = 0x0000;
    DM1CNT_L = 0x0000;
    DM1CNT_H = 0x0000;
    DM2SAD_L = 0x0000;
    DM2SAD_H = 0x0000;
    DM2DAD_L = 0x0000;
    DM2DAD_H = 0x0000;
    DM2CNT_L = 0x0000;
    DM2CNT_H = 0x0000;
    DM3SAD_L = 0x0000;
    DM3SAD_H = 0x0000;
    DM3DAD_L = 0x0000;
    DM3DAD_H = 0x0000;
    DM3CNT_L = 0x0000;
    DM3CNT_H = 0x0000;
    TM0D = 0x0000;
    TM0CNT = 0x0000;
    TM1D = 0x0000;
    TM1CNT = 0x0000;
    TM2D = 0x0000;
    TM2CNT = 0x0000;
    TM3D = 0x0000;
    TM3CNT = 0x0000;
    P1 = 0x03FF;
    IE = 0x0000;
    IF = 0x0000;
    IME = 0x0000;

    armMode = 0x1F;

    if (coreOptions.cpuIsMultiBoot) {
        reg[13].I = 0x03007F00;
        reg[15].I = 0x02000000;
        reg[16].I = 0x00000000;
        reg[R13_IRQ].I = 0x03007FA0;
        reg[R13_SVC].I = 0x03007FE0;
        armIrqEnable = true;
    } else {
        if (coreOptions.useBios && !coreOptions.skipBios) {
            reg[15].I = 0x00000000;
            armMode = 0x13;
            armIrqEnable = false;
        } else {
            reg[13].I = 0x03007F00;
            reg[15].I = 0x08000000;
            reg[16].I = 0x00000000;
            reg[R13_IRQ].I = 0x03007FA0;
            reg[R13_SVC].I = 0x03007FE0;
            armIrqEnable = true;
        }
    }
    armState = true;
    C_FLAG = V_FLAG = N_FLAG = Z_FLAG = false;
    UPDATE_REG(0x00, DISPCNT);
    UPDATE_REG(0x06, VCOUNT);
    UPDATE_REG(0x20, BG2PA);
    UPDATE_REG(0x26, BG2PD);
    UPDATE_REG(0x30, BG3PA);
    UPDATE_REG(0x36, BG3PD);
    UPDATE_REG(0x130, P1);
    UPDATE_REG(0x88, 0x200);

    // disable FIQ
    reg[16].I |= 0x40;

    CPUUpdateCPSR();

    armNextPC = reg[15].I;
    reg[15].I += 4;

    // reset internal state
    holdState = false;
    holdType = 0;

    biosProtected[0] = 0x00;
    biosProtected[1] = 0xf0;
    biosProtected[2] = 0x29;
    biosProtected[3] = 0xe1;

    lcdTicks = (coreOptions.useBios && !coreOptions.skipBios) ? 1008 : 208;
    timer0On = false;
    timer0Ticks = 0;
    timer0Reload = 0;
    timer0ClockReload = 0;
    timer1On = false;
    timer1Ticks = 0;
    timer1Reload = 0;
    timer1ClockReload = 0;
    timer2On = false;
    timer2Ticks = 0;
    timer2Reload = 0;
    timer2ClockReload = 0;
    timer3On = false;
    timer3Ticks = 0;
    timer3Reload = 0;
    timer3ClockReload = 0;
    dma0Source = 0;
    dma0Dest = 0;
    dma1Source = 0;
    dma1Dest = 0;
    dma2Source = 0;
    dma2Dest = 0;
    dma3Source = 0;
    dma3Dest = 0;
    renderLine = mode0RenderLine;
    fxOn = false;
    windowOn = false;
    frameCount = 0;
    coreOptions.layerEnable = DISPCNT & coreOptions.layerSettings;

    CPUUpdateRenderBuffers(true);

    for (int i = 0; i < 256; i++) {
        map[i].address = (uint8_t*)&dummyAddress;
        map[i].mask = 0;
    }

    map[0].address = g_bios;
    map[2].address = g_workRAM;
    map[3].address = g_internalRAM;
    map[4].address = g_ioMem;
    map[5].address = g_paletteRAM;
    map[6].address = g_vram;
    map[7].address = g_oam;
    map[8].address = g_rom;
    map[9].address = g_rom;
    map[10].address = g_rom;
    map[12].address = g_rom;
    map[14].address = flashSaveMemory;

    SetMapMasks();

    soundReset();

    CPUUpdateWindow0();
    CPUUpdateWindow1();

    // make sure registers are correctly initialized if not using BIOS
    if (!coreOptions.useBios) {
        if (coreOptions.cpuIsMultiBoot)
            BIOS_RegisterRamReset(0xfe);
        else
            BIOS_RegisterRamReset(0xff);
    } else {
        if (coreOptions.cpuIsMultiBoot)
            BIOS_RegisterRamReset(0xfe);
    }

    flashReset();
    eepromReset();
    SetSaveType(coreOptions.saveType);

    ARM_PREFETCH;

    systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;

    cpuDmaRunning = false;

    lastTime = systemGetClock();

    SWITicks = 0;
}

void CPUInterrupt()
{
    uint32_t PC = reg[15].I;
    bool savedState = armState;
    CPUSwitchMode(0x12, true, false);
    reg[14].I = PC;
    if (!savedState)
        reg[14].I += 2;
    reg[15].I = 0x18;
    armState = true;
    armIrqEnable = false;

    armNextPC = reg[15].I;
    reg[15].I += 4;
    ARM_PREFETCH;

    //  if(!holdState)
    biosProtected[0] = 0x02;
    biosProtected[1] = 0xc0;
    biosProtected[2] = 0x5e;
    biosProtected[3] = 0xe5;
}

static uint32_t joy;
static bool has_frames;

static void gbaUpdateJoypads(void)
{
    // update joystick information
    if (systemReadJoypads())
        // read default joystick
        joy = systemReadJoypad(-1);

    P1 = 0x03FF ^ (joy & 0x3FF);
    systemUpdateMotionSensor();
    UPDATE_REG(0x130, P1);
    uint16_t P1CNT = READ16LE(((uint16_t*)&g_ioMem[0x132]));

    // this seems wrong, but there are cases where the game
    // can enter the stop state without requesting an IRQ from
    // the joypad.
    if ((P1CNT & 0x4000) || stopState) {
        uint16_t p1 = (0x3FF ^ P1) & 0x3FF;
        if (P1CNT & 0x8000) {
            if (p1 == (P1CNT & 0x3FF)) {
                IF |= 0x1000;
                UPDATE_REG(0x202, IF);
            }
        } else {
            if (p1 & P1CNT) {
                IF |= 0x1000;
                UPDATE_REG(0x202, IF);
            }
        }
    }
}

void CPULoop(int ticks)
{
    int clockTicks;
    int timerOverflow = 0;
    // variable used by the CPU core
    cpuTotalTicks = 0;

#ifndef NO_LINK
// shuffle2: what's the purpose?
//if(GetLinkMode() != LINK_DISCONNECTED)
//cpuNextEvent = 1;
#endif

    cpuBreakLoop = false;
    cpuNextEvent = CPUUpdateTicks();
    if (cpuNextEvent > ticks)
        cpuNextEvent = ticks;

    for (;;) {
        if (!holdState && !SWITicks) {
            if (armState) {
                armOpcodeCount++;
                if (!armExecute())
                    return;
                if (debugger)
                    return;
            } else {
                thumbOpcodeCount++;
                if (!thumbExecute())
                    return;
                if (debugger)
                    return;
            }
            clockTicks = 0;
        } else
            clockTicks = CPUUpdateTicks();

        cpuTotalTicks += clockTicks;

        if (rtcIsEnabled())
            rtcUpdateTime(cpuTotalTicks);

        if (cpuTotalTicks >= cpuNextEvent) {
            int remainingTicks = cpuTotalTicks - cpuNextEvent;

            if (SWITicks) {
                SWITicks -= clockTicks;
                if (SWITicks < 0)
                    SWITicks = 0;
            }

            clockTicks = cpuNextEvent;
            cpuTotalTicks = 0;

        updateLoop:

            if (IRQTicks) {
                IRQTicks -= clockTicks;
                if (IRQTicks < 0)
                    IRQTicks = 0;
            }

            lcdTicks -= clockTicks;

            soundTicks += clockTicks;

            if (lcdTicks <= 0) {
                if (DISPSTAT & 1) { // V-BLANK
                    // if in V-Blank mode, keep computing...
                    if (DISPSTAT & 2) {
                        lcdTicks += 1008;
                        VCOUNT++;
                        UPDATE_REG(0x06, VCOUNT);
                        DISPSTAT &= 0xFFFD;
                        UPDATE_REG(0x04, DISPSTAT);
                        CPUCompareVCOUNT();
                    } else {
                        lcdTicks += 224;
                        DISPSTAT |= 2;
                        UPDATE_REG(0x04, DISPSTAT);
                        if (DISPSTAT & 16) {
                            IF |= 2;
                            UPDATE_REG(0x202, IF);
                        }
                    }

                    if (VCOUNT > 227) { //Reaching last line
                        DISPSTAT &= 0xFFFC;
                        UPDATE_REG(0x04, DISPSTAT);
                        VCOUNT = 0;
                        UPDATE_REG(0x06, VCOUNT);
                        CPUCompareVCOUNT();
                    }
                } else {
                    int framesToSkip = systemFrameSkip;

                    static bool speedup_throttle_set = false;
                    bool turbo_button_pressed        = (joy >> 10) & 1;
#ifndef __LIBRETRO__
                    static uint32_t last_throttle;
                    static bool current_volume_saved = false;
                    static float current_volume;

                    if (turbo_button_pressed) {
                        if (coreOptions.speedup_frame_skip)
                            framesToSkip = coreOptions.speedup_frame_skip;
                        else {
                            if (!speedup_throttle_set && coreOptions.throttle != coreOptions.speedup_throttle) {
                                last_throttle = coreOptions.throttle;
                                soundSetThrottle(DowncastU16(coreOptions.speedup_throttle));
                                speedup_throttle_set = true;
                            }

                            if (coreOptions.speedup_throttle_frame_skip)
                                framesToSkip += static_cast<int>(std::ceil(double(coreOptions.speedup_throttle) / 100.0) - 1);
                        }

                        if (coreOptions.speedup_mute && !current_volume_saved) {
                            current_volume = soundGetVolume();
                            current_volume_saved = true;
                            soundSetVolume(0);
                        }
                    }
                    else {
                        if (current_volume_saved) {
                            soundSetVolume(current_volume);
                            current_volume_saved = false;
                        }

                        if (speedup_throttle_set) {
                            soundSetThrottle(DowncastU16(last_throttle));
                            speedup_throttle_set = false;
                        }
                    }
#else
                    if (turbo_button_pressed)
                        framesToSkip = 9;
#endif

                    if (DISPSTAT & 2) {
                        // if in H-Blank, leave it and move to drawing mode
                        VCOUNT++;
                        UPDATE_REG(0x06, VCOUNT);

                        lcdTicks += 1008;
                        DISPSTAT &= 0xFFFD;
                        if (VCOUNT == 160) {
                            g_count++;
                            systemFrame();

                            if ((g_count % 10) == 0) {
                                system10Frames();
                            }
                            if (g_count == 60) {
                                uint32_t time = systemGetClock();
                                if (time != lastTime) {
                                    uint32_t t = 100000 / (time - lastTime);
                                    systemShowSpeed(t);
                                } else
                                    systemShowSpeed(0);
                                lastTime = time;
                                g_count = 0;
                            }

                            uint32_t ext = (joy >> 10);
                            // If no (m) code is enabled, apply the cheats at each LCDline
                            if ((coreOptions.cheatsEnabled) && (mastercode == 0))
                                remainingTicks += cheatsCheckKeys(P1 ^ 0x3FF, ext);

                            coreOptions.speedup = false;

                            if (ext & 1 && !speedup_throttle_set)
                                coreOptions.speedup = true;

                            capture = (ext & 2) ? true : false;

                            if (capture && !capturePrevious) {
                                captureNumber++;
                                systemScreenCapture(captureNumber);
                            }
                            capturePrevious = capture;

                            DISPSTAT |= 1;
                            DISPSTAT &= 0xFFFD;
                            UPDATE_REG(0x04, DISPSTAT);
                            if (DISPSTAT & 0x0008) {
                                IF |= 1;
                                UPDATE_REG(0x202, IF);
                            }
                            CPUCheckDMA(1, 0x0f);

                            psoundTickfn();

                            if (frameCount >= framesToSkip) {
                                systemDrawScreen();
                                frameCount = 0;
                            } else {
                                frameCount++;
                                systemSendScreen();
                            }
                            if (systemPauseOnFrame())
                                ticks = 0;

                            has_frames = true;
                        }

                        UPDATE_REG(0x04, DISPSTAT);
                        CPUCompareVCOUNT();

                    } else {
                        if (frameCount >= framesToSkip) {
                            (*renderLine)();
                            switch (systemColorDepth) {
                            case 16: {
#ifdef __LIBRETRO__
                                uint16_t* dest = (uint16_t*)g_pix + 240 * VCOUNT;
#else
                                uint16_t* dest = (uint16_t*)g_pix + 242 * (VCOUNT + 1);
#endif
                                for (int x = 0; x < 240;) {
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];

                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];

                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];

                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap16[g_lineMix[x++] & 0xFFFF];
                                }
// for filters that read past the screen
#ifndef __LIBRETRO__
                                *dest++ = 0;
#endif
                            } break;
                            case 24: {
                                uint8_t* dest = (uint8_t*)g_pix + 240 * VCOUNT * 3;
                                for (int x = 0; x < 240;) {
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;

                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;

                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;

                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                    *((uint32_t*)dest) = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    dest += 3;
                                }
                            } break;
                            case 32: {
#ifdef __LIBRETRO__
                                uint32_t* dest = (uint32_t*)g_pix + 240 * VCOUNT;
#else
                                uint32_t* dest = (uint32_t*)g_pix + 241 * (VCOUNT + 1);
#endif
                                for (int x = 0; x < 240;) {
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];

                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];

                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];

                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                    *dest++ = systemColorMap32[g_lineMix[x++] & 0xFFFF];
                                }
                            } break;
                            }
                        }
                        // entering H-Blank
                        DISPSTAT |= 2;
                        UPDATE_REG(0x04, DISPSTAT);
                        lcdTicks += 224;
                        CPUCheckDMA(2, 0x0f);
                        if (DISPSTAT & 16) {
                            IF |= 2;
                            UPDATE_REG(0x202, IF);
                        }
                    }
                }
            }

            // we shouldn't be doing sound in stop state, but we loose synchronization
            // if sound is disabled, so in stop state, soundTick will just produce
            // mute sound

            //soundTicks -= clockTicks;
            //if (soundTicks <= 0) {
                //psoundTickfn();
                //soundTicks += SOUND_CLOCK_TICKS;
            //}

            if (!stopState) {
                if (timer0On) {
                    timer0Ticks -= clockTicks;
                    if (timer0Ticks <= 0) {
                        timer0Ticks += (0x10000 - timer0Reload) << timer0ClockReload;
                        timerOverflow |= 1;
                        soundTimerOverflow(0);
                        if (TM0CNT & 0x40) {
                            IF |= 0x08;
                            UPDATE_REG(0x202, IF);
                        }
                    }
                    TM0D = 0xFFFF - DowncastU16(timer0Ticks >> timer0ClockReload);
                    UPDATE_REG(0x100, TM0D);
                }

                if (timer1On) {
                    if (TM1CNT & 4) {
                        if (timerOverflow & 1) {
                            TM1D++;
                            if (TM1D == 0) {
                                TM1D += DowncastU16(timer1Reload);
                                timerOverflow |= 2;
                                soundTimerOverflow(1);
                                if (TM1CNT & 0x40) {
                                    IF |= 0x10;
                                    UPDATE_REG(0x202, IF);
                                }
                            }
                            UPDATE_REG(0x104, TM1D);
                        }
                    } else {
                        timer1Ticks -= clockTicks;
                        if (timer1Ticks <= 0) {
                            timer1Ticks += (0x10000 - timer1Reload) << timer1ClockReload;
                            timerOverflow |= 2;
                            soundTimerOverflow(1);
                            if (TM1CNT & 0x40) {
                                IF |= 0x10;
                                UPDATE_REG(0x202, IF);
                            }
                        }
                        TM1D = 0xFFFF - DowncastU16(timer1Ticks >> timer1ClockReload);
                        UPDATE_REG(0x104, TM1D);
                    }
                }

                if (timer2On) {
                    if (TM2CNT & 4) {
                        if (timerOverflow & 2) {
                            TM2D++;
                            if (TM2D == 0) {
                                TM2D += DowncastU16(timer2Reload);
                                timerOverflow |= 4;
                                if (TM2CNT & 0x40) {
                                    IF |= 0x20;
                                    UPDATE_REG(0x202, IF);
                                }
                            }
                            UPDATE_REG(0x108, TM2D);
                        }
                    } else {
                        timer2Ticks -= clockTicks;
                        if (timer2Ticks <= 0) {
                            timer2Ticks += (0x10000 - timer2Reload) << timer2ClockReload;
                            timerOverflow |= 4;
                            if (TM2CNT & 0x40) {
                                IF |= 0x20;
                                UPDATE_REG(0x202, IF);
                            }
                        }
                        TM2D = 0xFFFF - DowncastU16(timer2Ticks >> timer2ClockReload);
                        UPDATE_REG(0x108, TM2D);
                    }
                }

                if (timer3On) {
                    if (TM3CNT & 4) {
                        if (timerOverflow & 4) {
                            TM3D++;
                            if (TM3D == 0) {
                                TM3D += DowncastU16(timer3Reload);
                                if (TM3CNT & 0x40) {
                                    IF |= 0x40;
                                    UPDATE_REG(0x202, IF);
                                }
                            }
                            UPDATE_REG(0x10C, TM3D);
                        }
                    } else {
                        timer3Ticks -= clockTicks;
                        if (timer3Ticks <= 0) {
                            timer3Ticks += (0x10000 - timer3Reload) << timer3ClockReload;
                            if (TM3CNT & 0x40) {
                                IF |= 0x40;
                                UPDATE_REG(0x202, IF);
                            }
                        }
                        TM3D = 0xFFFF - DowncastU16(timer3Ticks >> timer3ClockReload);
                        UPDATE_REG(0x10C, TM3D);
                    }
                }
            }

            timerOverflow = 0;

#ifdef PROFILING
            profilingTicks -= clockTicks;
            if (profilingTicks <= 0) {
                profilingTicks += profilingTicksReload;
                if (profilSegment) {
                    profile_segment* seg = profilSegment;
                    do {
                        uint16_t* b = (uint16_t*)seg->sbuf;
                        int pc = ((reg[15].I - seg->s_lowpc) * seg->s_scale) / 0x10000;
                        if (pc >= 0 && pc < seg->ssiz) {
                            b[pc]++;
                            break;
                        }

                        seg = seg->next;
                    } while (seg);
                }
            }
#endif

            ticks -= clockTicks;

#ifndef NO_LINK
            if (GetLinkMode() != LINK_DISCONNECTED)
                LinkUpdate(clockTicks);
#endif

            cpuNextEvent = CPUUpdateTicks();

            if (cpuDmaTicksToUpdate > 0) {
                if (cpuDmaTicksToUpdate > cpuNextEvent)
                    clockTicks = cpuNextEvent;
                else
                    clockTicks = cpuDmaTicksToUpdate;
                cpuDmaTicksToUpdate -= clockTicks;
                if (cpuDmaTicksToUpdate < 0)
                    cpuDmaTicksToUpdate = 0;
                goto updateLoop;
            }

#ifndef NO_LINK
            // shuffle2: what's the purpose?
            if (GetLinkMode() != LINK_DISCONNECTED || gba_joybus_active)
                cpuNextEvent = 1;
#endif

            if (IF && (IME & 1) && armIrqEnable) {
                int res = IF & IE;
                if (stopState)
                    res &= 0x3080;
                if (res) {
                    if (intState) {
                        if (!IRQTicks) {
                            CPUInterrupt();
                            intState = false;
                            holdState = false;
                            stopState = false;
                            holdType = 0;
                        }
                    } else {
                        if (!holdState) {
                            intState = true;
                            IRQTicks = 7;
                            if (cpuNextEvent > IRQTicks)
                                cpuNextEvent = IRQTicks;
                        } else {
                            CPUInterrupt();
                            holdState = false;
                            stopState = false;
                            holdType = 0;
                        }
                    }

                    // Stops the SWI Ticks emulation if an IRQ is executed
                    //(to avoid problems with nested IRQ/SWI)
                    if (SWITicks)
                        SWITicks = 0;
                }
            }

            if (remainingTicks > 0) {
                if (remainingTicks > cpuNextEvent)
                    clockTicks = cpuNextEvent;
                else
                    clockTicks = remainingTicks;
                remainingTicks -= clockTicks;
                if (remainingTicks < 0)
                    remainingTicks = 0;
                goto updateLoop;
            }

            if (timerOnOffDelay)
                applyTimer();

            if (cpuNextEvent > ticks)
                cpuNextEvent = ticks;

            // end loop when a frame is done
            if (ticks <= 0 || cpuBreakLoop || has_frames)
                break;
        }
    }
#ifndef NO_LINK
    if (GetLinkMode() != LINK_DISCONNECTED)
        CheckLinkConnection();
#endif
}

void gbaEmulate(int ticks)
{
    has_frames = false;

    // Read and process inputs
    gbaUpdateJoypads();

    // Runs nth number of ticks till vblank, outputs audio
    // then the video frames.
    // sanity check:
    // wrapped in loop in case frames has not been written yet
    do {
        CPULoop(ticks);
    } while (!has_frames);
}

struct EmulatedSystem GBASystem = {
    // emuMain
    gbaEmulate,
    // emuReset
    CPUReset,
    // emuCleanUp
    CPUCleanUp,
#ifdef __LIBRETRO__
    NULL,           // emuReadBattery
    NULL,           // emuReadState
    CPUReadState,   // emuReadState
    CPUWriteState,  // emuWriteState
    NULL,           // emuReadMemState
    NULL,           // emuWriteMemState
    NULL,           // emuWritePNG
    NULL,           // emuWriteBMP
#else
    // emuReadBattery
    CPUReadBatteryFile,
    // emuWriteBattery
    CPUWriteBatteryFile,
    // emuReadState
    CPUReadState,
    // emuWriteState
    CPUWriteState,
    // emuReadMemState
    CPUReadMemState,
    // emuWriteMemState
    CPUWriteMemState,
    // emuWritePNG
    CPUWritePNGFile,
    // emuWriteBMP
    CPUWriteBMPFile,
#endif
    // emuUpdateCPSR
    CPUUpdateCPSR,
    // emuHasDebugger
    true,
    // emuCount
#ifdef FINAL_VERSION
    300000
#else
    5000
#endif
};
