js/mmu.js

function MemoryView(memory, offset) {
	this.inherit();
	this.buffer = memory;
	this.view = new DataView(this.buffer, typeof(offset) === "number" ? offset : 0);
	this.mask = memory.byteLength - 1;
	this.resetMask();
};

MemoryView.prototype.resetMask = function() {
	this.mask8 = this.mask & 0xFFFFFFFF;
	this.mask16 = this.mask & 0xFFFFFFFE;
	this.mask32 = this.mask & 0xFFFFFFFC;
};

MemoryView.prototype.load8 = function(offset) {
	return this.view.getInt8(offset & this.mask8);
};

MemoryView.prototype.load16 = function(offset) {
	// Unaligned 16-bit loads are unpredictable...let's just pretend they work
	return this.view.getInt16(offset & this.mask, true);
};

MemoryView.prototype.loadU8 = function(offset) {
	return this.view.getUint8(offset & this.mask8);
};

MemoryView.prototype.loadU16 = function(offset) {
	// Unaligned 16-bit loads are unpredictable...let's just pretend they work
	return this.view.getUint16(offset & this.mask, true);
};

MemoryView.prototype.load32 = function(offset) {
	// Unaligned 32-bit loads are "rotated" so they make some semblance of sense
	var rotate = (offset & 3) << 3;
	var mem = this.view.getInt32(offset & this.mask32, true);
	return (mem >>> rotate) | (mem << (32 - rotate));
};

MemoryView.prototype.store8 = function(offset, value) {
	this.view.setInt8(offset & this.mask8, value);
};

MemoryView.prototype.store16 = function(offset, value) {
	this.view.setInt16(offset & this.mask16, value, true);
};

MemoryView.prototype.store32 = function(offset, value) {
	this.view.setInt32(offset & this.mask32, value, true);
};

MemoryView.prototype.invalidatePage = function(address) {};

MemoryView.prototype.replaceData = function(memory, offset) {
	this.buffer = memory;
	this.view = new DataView(this.buffer, typeof(offset) === "number" ? offset : 0);
	if (this.icache) {
		this.icache = new Array(this.icache.length);
	}
};

function MemoryBlock(size, cacheBits) {
	MemoryView.call(this, new ArrayBuffer(size));
	this.ICACHE_PAGE_BITS = cacheBits;
	this.PAGE_MASK = (2 << this.ICACHE_PAGE_BITS) - 1;
	this.icache = new Array(size >> (this.ICACHE_PAGE_BITS + 1));
};

MemoryBlock.prototype = Object.create(MemoryView.prototype);

MemoryBlock.prototype.invalidatePage = function(address) {
	var page = this.icache[(address & this.mask) >> this.ICACHE_PAGE_BITS];
	if (page) {
		page.invalid = true;
	}
};

function ROMView(rom, offset) {
	MemoryView.call(this, rom, offset);
	this.ICACHE_PAGE_BITS = 10;
	this.PAGE_MASK = (2 << this.ICACHE_PAGE_BITS) - 1;
	this.icache = new Array(rom.byteLength >> (this.ICACHE_PAGE_BITS + 1));
	this.mask = 0x01FFFFFF;
	this.resetMask();
};

ROMView.prototype = Object.create(MemoryView.prototype);

ROMView.prototype.store8 = function(offset, value) {};

ROMView.prototype.store16 = function(offset, value) {
	if (offset < 0xCA && offset >= 0xC4) {
		if (!this.gpio) {
			this.gpio = this.mmu.allocGPIO(this);
		}
		this.gpio.store16(offset, value);
	}
};

ROMView.prototype.store32 = function(offset, value) {
	if (offset < 0xCA && offset >= 0xC4) {
		if (!this.gpio) {
			this.gpio = this.mmu.allocGPIO(this);
		}
		this.gpio.store32(offset, value);
	}
};

function BIOSView(rom, offset) {
	MemoryView.call(this, rom, offset);
	this.ICACHE_PAGE_BITS = 16;
	this.PAGE_MASK = (2 << this.ICACHE_PAGE_BITS) - 1;
	this.icache = new Array(1);
};

BIOSView.prototype = Object.create(MemoryView.prototype);

BIOSView.prototype.load8 = function(offset) {
	if (offset >= this.buffer.byteLength) {
		return -1;
	}
	return this.view.getInt8(offset);
};

BIOSView.prototype.load16 = function(offset) {
	if (offset >= this.buffer.byteLength) {
		return -1;
	}
	return this.view.getInt16(offset, true);
};

BIOSView.prototype.loadU8 = function(offset) {
	if (offset >= this.buffer.byteLength) {
		return -1;
	}
	return this.view.getUint8(offset);
};

BIOSView.prototype.loadU16 = function(offset) {
	if (offset >= this.buffer.byteLength) {
		return -1;
	}
	return this.view.getUint16(offset, true);
};

BIOSView.prototype.load32 = function(offset) {
	if (offset >= this.buffer.byteLength) {
		return -1;
	}
	return this.view.getInt32(offset, true);
};

BIOSView.prototype.store8 = function(offset, value) {};

BIOSView.prototype.store16 = function(offset, value) {};

BIOSView.prototype.store32 = function(offset, value) {};

function BadMemory(mmu, cpu) {
	this.inherit();
	this.cpu = cpu;
	this.mmu = mmu
};

BadMemory.prototype.load8 = function(offset) {
	return this.mmu.load8(this.cpu.gprs[this.cpu.PC] - this.cpu.instructionWidth + (offset & 0x3));
};

BadMemory.prototype.load16 = function(offset) {
	return this.mmu.load16(this.cpu.gprs[this.cpu.PC] - this.cpu.instructionWidth + (offset & 0x2));
};

BadMemory.prototype.loadU8 = function(offset) {
	return this.mmu.loadU8(this.cpu.gprs[this.cpu.PC] - this.cpu.instructionWidth + (offset & 0x3));
};

BadMemory.prototype.loadU16 = function(offset) {
	return this.mmu.loadU16(this.cpu.gprs[this.cpu.PC] - this.cpu.instructionWidth + (offset & 0x2));
};

BadMemory.prototype.load32 = function(offset) {
	if (this.cpu.execMode == this.cpu.MODE_ARM) {
		return this.mmu.load32(this.cpu.gprs[this.cpu.gprs.PC] - this.cpu.instructionWidth);
	} else {
		var halfword = this.mmu.loadU16(this.cpu.gprs[this.cpu.PC] - this.cpu.instructionWidth);
		return halfword | (halfword << 16);
	}
};

BadMemory.prototype.store8 = function(offset, value) {};

BadMemory.prototype.store16 = function(offset, value) {};

BadMemory.prototype.store32 = function(offset, value) {};

BadMemory.prototype.invalidatePage = function(address) {};

function GameBoyAdvanceMMU() {
	this.inherit();
	this.REGION_BIOS = 0x0;
	this.REGION_WORKING_RAM = 0x2;
	this.REGION_WORKING_IRAM = 0x3;
	this.REGION_IO = 0x4;
	this.REGION_PALETTE_RAM = 0x5;
	this.REGION_VRAM = 0x6;
	this.REGION_OAM = 0x7;
	this.REGION_CART0 = 0x8;
	this.REGION_CART1 = 0xA;
	this.REGION_CART2 = 0xC;
	this.REGION_CART_SRAM = 0xE;

	this.BASE_BIOS = 0x00000000;
	this.BASE_WORKING_RAM = 0x02000000;
	this.BASE_WORKING_IRAM = 0x03000000;
	this.BASE_IO = 0x04000000;
	this.BASE_PALETTE_RAM = 0x05000000;
	this.BASE_VRAM = 0x06000000;
	this.BASE_OAM = 0x07000000;
	this.BASE_CART0 = 0x08000000;
	this.BASE_CART1 = 0x0A000000;
	this.BASE_CART2 = 0x0C000000;
	this.BASE_CART_SRAM = 0x0E000000;

	this.BASE_MASK = 0x0F000000;
	this.BASE_OFFSET = 24;
	this.OFFSET_MASK = 0x00FFFFFF;

	this.SIZE_BIOS = 0x00004000;
	this.SIZE_WORKING_RAM = 0x00040000;
	this.SIZE_WORKING_IRAM = 0x00008000;
	this.SIZE_IO = 0x00000400;
	this.SIZE_PALETTE_RAM = 0x00000400;
	this.SIZE_VRAM = 0x00018000;
	this.SIZE_OAM = 0x00000400;
	this.SIZE_CART0 = 0x02000000;
	this.SIZE_CART1 = 0x02000000;
	this.SIZE_CART2 = 0x02000000;
	this.SIZE_CART_SRAM = 0x00008000;
	this.SIZE_CART_FLASH512 = 0x00010000;
	this.SIZE_CART_FLASH1M = 0x00020000;
	this.SIZE_CART_EEPROM = 0x00002000;

	this.DMA_TIMING_NOW = 0;
	this.DMA_TIMING_VBLANK = 1;
	this.DMA_TIMING_HBLANK = 2;
	this.DMA_TIMING_CUSTOM = 3;

	this.DMA_INCREMENT = 0;
	this.DMA_DECREMENT = 1;
	this.DMA_FIXED = 2;
	this.DMA_INCREMENT_RELOAD = 3;

	this.DMA_OFFSET = [ 1, -1, 0, 1 ];

	this.WAITSTATES = [ 0, 0, 2, 0, 0, 0, 0, 0, 4, 4, 4, 4, 4, 4, 4 ];
	this.WAITSTATES_32 = [ 0, 0, 5, 0, 0, 1, 0, 1, 7, 7, 9, 9, 13, 13, 8 ];
	this.WAITSTATES_SEQ = [ 0, 0, 2, 0, 0, 0, 0, 0, 2, 2, 4, 4, 8, 8, 4 ];
	this.WAITSTATES_SEQ_32 = [ 0, 0, 5, 0, 0, 1, 0, 1, 5, 5, 9, 9, 17, 17, 8 ];
	this.NULLWAIT = [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ];

	for (var i = 15; i < 256; ++i) {
		this.WAITSTATES[i] = 0;
		this.WAITSTATES_32[i] = 0;
		this.WAITSTATES_SEQ[i] = 0;
		this.WAITSTATES_SEQ_32[i] = 0;
		this.NULLWAIT[i] = 0;
	}

	this.ROM_WS = [ 4, 3, 2, 8 ];
	this.ROM_WS_SEQ = [
		[ 2, 1 ],
		[ 4, 1 ],
		[ 8, 1 ]
	];

	this.ICACHE_PAGE_BITS = 8;
	this.PAGE_MASK = (2 << this.ICACHE_PAGE_BITS) - 1;

	this.bios = null;
};

GameBoyAdvanceMMU.prototype.mmap = function(region, object) {
	this.memory[region] = object;
}

GameBoyAdvanceMMU.prototype.clear = function() {
	this.badMemory = new BadMemory(this, this.cpu);
	this.memory = [
		this.bios,
		this.badMemory, // Unused
		new MemoryBlock(this.SIZE_WORKING_RAM, 9),
		new MemoryBlock(this.SIZE_WORKING_IRAM, 7),
		null, // This is owned by GameBoyAdvanceIO
		null, // This is owned by GameBoyAdvancePalette
		null, // This is owned by GameBoyAdvanceVRAM
		null, // This is owned by GameBoyAdvanceOAM
		this.badMemory,
		this.badMemory,
		this.badMemory,
		this.badMemory,
		this.badMemory,
		this.badMemory,
		this.badMemory,
		this.badMemory // Unused
	];
	for (var i = 16; i < 256; ++i) {
		this.memory[i] = this.badMemory;
	}

	this.waitstates = this.WAITSTATES.slice(0);
	this.waitstatesSeq = this.WAITSTATES_SEQ.slice(0);
	this.waitstates32 = this.WAITSTATES_32.slice(0);
	this.waitstatesSeq32 = this.WAITSTATES_SEQ_32.slice(0);
	this.waitstatesPrefetch = this.WAITSTATES_SEQ.slice(0);
	this.waitstatesPrefetch32 = this.WAITSTATES_SEQ_32.slice(0);

	this.cart = null;
	this.save = null;

	this.DMA_REGISTER = [
		this.core.io.DMA0CNT_HI >> 1,
		this.core.io.DMA1CNT_HI >> 1,
		this.core.io.DMA2CNT_HI >> 1,
		this.core.io.DMA3CNT_HI >> 1
	];
};

GameBoyAdvanceMMU.prototype.freeze = function() {
	return {
		'ram': Serializer.prefix(this.memory[this.REGION_WORKING_RAM].buffer),
		'iram': Serializer.prefix(this.memory[this.REGION_WORKING_IRAM].buffer),
	};
};

GameBoyAdvanceMMU.prototype.defrost = function(frost) {
	this.memory[this.REGION_WORKING_RAM].replaceData(frost.ram);
	this.memory[this.REGION_WORKING_IRAM].replaceData(frost.iram);
};

GameBoyAdvanceMMU.prototype.loadBios = function(bios, real) {
	this.bios = new BIOSView(bios);
	this.bios.real = !!real;
};

GameBoyAdvanceMMU.prototype.loadRom = function(rom, process) {
	var cart = {
		title: null,
		code: null,
		maker: null,
		memory: rom,
		saveType: null,
	};

	var lo = new ROMView(rom);
	if (lo.view.getUint8(0xB2) != 0x96) {
		// Not a valid ROM
		return null;
	}
	lo.mmu = this; // Needed for GPIO
	this.memory[this.REGION_CART0] = lo;
	this.memory[this.REGION_CART1] = lo;
	this.memory[this.REGION_CART2] = lo;

	if (rom.byteLength > 0x01000000) {
		var hi = new ROMView(rom, 0x01000000);
		this.memory[this.REGION_CART0 + 1] = hi;
		this.memory[this.REGION_CART1 + 1] = hi;
		this.memory[this.REGION_CART2 + 1] = hi;
	}

	if (process) {
		var name = '';
		for (var i = 0; i < 12; ++i) {
			var c = lo.loadU8(i + 0xA0);
			if (!c) {
				break;
			}
			name += String.fromCharCode(c);
		}
		cart.title = name;

		var code = '';
		for (var i = 0; i < 4; ++i) {
			var c = lo.loadU8(i + 0xAC);
			if (!c) {
				break;
			}
			code += String.fromCharCode(c);
		}
		cart.code = code;

		var maker = '';
		for (var i = 0; i < 2; ++i) {
			var c = lo.loadU8(i + 0xB0);
			if (!c) {
				break;
			}
			maker += String.fromCharCode(c);
		}
		cart.maker = maker;

		// Find savedata type
		var state = '';
		var next;
		var terminal = false;
		for (var i = 0xE4; i < rom.byteLength && !terminal; ++i) {
			next = String.fromCharCode(lo.loadU8(i));
			state += next;
			switch (state) {
			case 'F':
			case 'FL':
			case 'FLA':
			case 'FLAS':
			case 'FLASH':
			case 'FLASH_':
			case 'FLASH5':
			case 'FLASH51':
			case 'FLASH512':
			case 'FLASH512_':
			case 'FLASH1':
			case 'FLASH1M':
			case 'FLASH1M_':
			case 'S':
			case 'SR':
			case 'SRA':
			case 'SRAM':
			case 'SRAM_':
			case 'E':
			case 'EE':
			case 'EEP':
			case 'EEPR':
			case 'EEPRO':
			case 'EEPROM':
			case 'EEPROM_':
				break;
			case 'FLASH_V':
			case 'FLASH512_V':
			case 'FLASH1M_V':
			case 'SRAM_V':
			case 'EEPROM_V':
				terminal = true;
				break;
			default:
				state = next;
				break;
			}
		}
		if (terminal) {
			cart.saveType = state;
			switch (state) {
			case 'FLASH_V':
			case 'FLASH512_V':
				this.save = this.memory[this.REGION_CART_SRAM] = new FlashSavedata(this.SIZE_CART_FLASH512);
				break;
			case 'FLASH1M_V':
				this.save = this.memory[this.REGION_CART_SRAM] = new FlashSavedata(this.SIZE_CART_FLASH1M);
				break;
			case 'SRAM_V':
				this.save = this.memory[this.REGION_CART_SRAM] = new SRAMSavedata(this.SIZE_CART_SRAM);
				break;
			case 'EEPROM_V':
				this.save = this.memory[this.REGION_CART2 + 1] = new EEPROMSavedata(this.SIZE_CART_EEPROM, this);
				break;
			}
		}
		if (!this.save) {
			// Assume we have SRAM
			this.save = this.memory[this.REGION_CART_SRAM] = new SRAMSavedata(this.SIZE_CART_SRAM);
		}
	}

	this.cart = cart;
	return cart;
};

GameBoyAdvanceMMU.prototype.loadSavedata = function(save) {
	this.save.replaceData(save);
};

GameBoyAdvanceMMU.prototype.load8 = function(offset) {
	return this.memory[offset >>> this.BASE_OFFSET].load8(offset & 0x00FFFFFF);
};

GameBoyAdvanceMMU.prototype.load16 = function(offset) {
	return this.memory[offset >>> this.BASE_OFFSET].load16(offset & 0x00FFFFFF);
};

GameBoyAdvanceMMU.prototype.load32 = function(offset) {
	return this.memory[offset >>> this.BASE_OFFSET].load32(offset & 0x00FFFFFF);
};

GameBoyAdvanceMMU.prototype.loadU8 = function(offset) {
	return this.memory[offset >>> this.BASE_OFFSET].loadU8(offset & 0x00FFFFFF);
};

GameBoyAdvanceMMU.prototype.loadU16 = function(offset) {
	return this.memory[offset >>> this.BASE_OFFSET].loadU16(offset & 0x00FFFFFF);
};

GameBoyAdvanceMMU.prototype.store8 = function(offset, value) {
	var maskedOffset = offset & 0x00FFFFFF;
	var memory = this.memory[offset >>> this.BASE_OFFSET];
	memory.store8(maskedOffset, value);
	memory.invalidatePage(maskedOffset);
};

GameBoyAdvanceMMU.prototype.store16 = function(offset, value) {
	var maskedOffset = offset & 0x00FFFFFE;
	var memory = this.memory[offset >>> this.BASE_OFFSET];
	memory.store16(maskedOffset, value);
	memory.invalidatePage(maskedOffset);
};

GameBoyAdvanceMMU.prototype.store32 = function(offset, value) {
	var maskedOffset = offset & 0x00FFFFFC;
	var memory = this.memory[offset >>> this.BASE_OFFSET];
	memory.store32(maskedOffset, value);
	memory.invalidatePage(maskedOffset);
	memory.invalidatePage(maskedOffset + 2);
};

GameBoyAdvanceMMU.prototype.waitPrefetch = function(memory) {
	this.cpu.cycles += 1 + this.waitstatesPrefetch[memory >>> this.BASE_OFFSET];
};

GameBoyAdvanceMMU.prototype.waitPrefetch32 = function(memory) {
	this.cpu.cycles += 1 + this.waitstatesPrefetch32[memory >>> this.BASE_OFFSET];
};

GameBoyAdvanceMMU.prototype.wait = function(memory) {
	this.cpu.cycles += 1 + this.waitstates[memory >>> this.BASE_OFFSET];
};

GameBoyAdvanceMMU.prototype.wait32 = function(memory) {
	this.cpu.cycles += 1 + this.waitstates32[memory >>> this.BASE_OFFSET];
};

GameBoyAdvanceMMU.prototype.waitSeq = function(memory) {
	this.cpu.cycles += 1 + this.waitstatesSeq[memory >>> this.BASE_OFFSET];
};

GameBoyAdvanceMMU.prototype.waitSeq32 = function(memory) {
	this.cpu.cycles += 1 + this.waitstatesSeq32[memory >>> this.BASE_OFFSET];
};

GameBoyAdvanceMMU.prototype.waitMul = function(rs) {
	if ((rs & 0xFFFFFF00 == 0xFFFFFF00) || !(rs & 0xFFFFFF00)) {
		this.cpu.cycles += 1;
	} else if ((rs & 0xFFFF0000 == 0xFFFF0000) || !(rs & 0xFFFF0000)) {
		this.cpu.cycles += 2;
	} else if ((rs & 0xFF000000 == 0xFF000000) || !(rs & 0xFF000000)) {
		this.cpu.cycles += 3;
	} else {
		this.cpu.cycles += 4;
	}
}

GameBoyAdvanceMMU.prototype.waitMulti32 = function(memory, seq) {
	this.cpu.cycles += 1 + this.waitstates32[memory >>> this.BASE_OFFSET];
	this.cpu.cycles += (1 + this.waitstatesSeq32[memory >>> this.BASE_OFFSET]) * (seq - 1);
};

GameBoyAdvanceMMU.prototype.addressToPage = function(region, address) {
	return address >> this.memory[region].ICACHE_PAGE_BITS;
};

GameBoyAdvanceMMU.prototype.accessPage = function(region, pageId) {
	var memory = this.memory[region];
	var page = memory.icache[pageId];
	if (!page || page.invalid) {
		page = {
			thumb: new Array(1 << (memory.ICACHE_PAGE_BITS)),
			arm: new Array(1 << memory.ICACHE_PAGE_BITS - 1),
			invalid: false
		}
		memory.icache[pageId] = page;
	}
	return page;
};

GameBoyAdvanceMMU.prototype.scheduleDma = function(number, info) {
	switch (info.timing) {
	case this.DMA_TIMING_NOW:
		this.serviceDma(number, info);
		break;
	case this.DMA_TIMING_HBLANK:
		// Handled implicitly
		break;
	case this.DMA_TIMING_VBLANK:
		// Handled implicitly
		break;
	case this.DMA_TIMING_CUSTOM:
		switch (number) {
		case 0:
			this.core.WARN('Discarding invalid DMA0 scheduling');
			break;
		case 1:
		case 2:
			this.cpu.irq.audio.scheduleFIFODma(number, info);
			break;
		case 3:
			this.cpu.irq.video.scheduleVCaptureDma(dma, info);
			break;
		}
	}
};

GameBoyAdvanceMMU.prototype.runHblankDmas = function() {
	var dma;
	for (var i = 0; i < this.cpu.irq.dma.length; ++i) {
		dma = this.cpu.irq.dma[i];
		if (dma.enable && dma.timing == this.DMA_TIMING_HBLANK) {
			this.serviceDma(i, dma);
		}
	}
};

GameBoyAdvanceMMU.prototype.runVblankDmas = function() {
	var dma;
	for (var i = 0; i < this.cpu.irq.dma.length; ++i) {
		dma = this.cpu.irq.dma[i];
		if (dma.enable && dma.timing == this.DMA_TIMING_VBLANK) {
			this.serviceDma(i, dma);
		}
	}
};

GameBoyAdvanceMMU.prototype.serviceDma = function(number, info) {
	if (!info.enable) {
		// There was a DMA scheduled that got canceled
		return;
	}

	var width = info.width;
	var sourceOffset = this.DMA_OFFSET[info.srcControl] * width;
	var destOffset = this.DMA_OFFSET[info.dstControl] * width;
	var wordsRemaining = info.nextCount;
	var source = info.nextSource & this.OFFSET_MASK;
	var dest = info.nextDest & this.OFFSET_MASK;
	var sourceRegion = info.nextSource >>> this.BASE_OFFSET;
	var destRegion = info.nextDest >>> this.BASE_OFFSET;
	var sourceBlock = this.memory[sourceRegion];
	var destBlock = this.memory[destRegion];
	var sourceView = null;
	var destView = null;
	var sourceMask = 0xFFFFFFFF;
	var destMask = 0xFFFFFFFF;
	var word;

	if (destBlock.ICACHE_PAGE_BITS) {
		var endPage = (dest + wordsRemaining * width) >> destBlock.ICACHE_PAGE_BITS;
		for (var i = dest >> destBlock.ICACHE_PAGE_BITS; i <= endPage; ++i) {
			destBlock.invalidatePage(i << destBlock.ICACHE_PAGE_BITS);
		}
	}

	if (destRegion == this.REGION_WORKING_RAM || destRegion == this.REGION_WORKING_IRAM) {
		destView = destBlock.view;
		destMask = destBlock.mask;
	}

	if (sourceRegion == this.REGION_WORKING_RAM || sourceRegion == this.REGION_WORKING_IRAM || sourceRegion == this.REGION_CART0 || sourceRegion == this.REGION_CART1) {
		sourceView = sourceBlock.view;
		sourceMask = sourceBlock.mask;
	}

	if (sourceBlock && destBlock) {
		if (sourceView && destView) {
			if (width == 4) {
				source &= 0xFFFFFFFC;
				dest &= 0xFFFFFFFC;
				while (wordsRemaining--) {
					word = sourceView.getInt32(source & sourceMask);
					destView.setInt32(dest & destMask, word);
					source += sourceOffset;
					dest += destOffset;
				}
			} else {
				while (wordsRemaining--) {
					word = sourceView.getUint16(source & sourceMask);
					destView.setUint16(dest & destMask, word);
					source += sourceOffset;
					dest += destOffset;
				}
			}
		} else if (sourceView) {
			if (width == 4) {
				source &= 0xFFFFFFFC;
				dest &= 0xFFFFFFFC;
				while (wordsRemaining--) {
					word = sourceView.getInt32(source & sourceMask, true);
					destBlock.store32(dest, word);
					source += sourceOffset;
					dest += destOffset;
				}
			} else {
				while (wordsRemaining--) {
					word = sourceView.getUint16(source & sourceMask, true);
					destBlock.store16(dest, word);
					source += sourceOffset;
					dest += destOffset;
				}
			}
		} else {
			if (width == 4) {
				source &= 0xFFFFFFFC;
				dest &= 0xFFFFFFFC;
				while (wordsRemaining--) {
					word = sourceBlock.load32(source);
					destBlock.store32(dest, word);
					source += sourceOffset;
					dest += destOffset;
				}
			} else {
				while (wordsRemaining--) {
					word = sourceBlock.loadU16(source);
					destBlock.store16(dest, word);
					source += sourceOffset;
					dest += destOffset;
				}
			}
		}
	} else {
		this.core.WARN('Invalid DMA');
	}

	if (info.doIrq) {
		info.nextIRQ = this.cpu.cycles + 2;
		info.nextIRQ += (width == 4 ? this.waitstates32[sourceRegion] + this.waitstates32[destRegion]
		                            : this.waitstates[sourceRegion] + this.waitstates[destRegion]);
		info.nextIRQ += (info.count - 1) * (width == 4 ? this.waitstatesSeq32[sourceRegion] + this.waitstatesSeq32[destRegion]
		                                               : this.waitstatesSeq[sourceRegion] + this.waitstatesSeq[destRegion]);
	}

	info.nextSource = source | (sourceRegion << this.BASE_OFFSET);
	info.nextDest = dest | (destRegion << this.BASE_OFFSET);
	info.nextCount = wordsRemaining;

	if (!info.repeat) {
		info.enable = false;

		// Clear the enable bit in memory
		var io = this.memory[this.REGION_IO];
		io.registers[this.DMA_REGISTER[number]] &= 0x7FE0;
	} else {
		info.nextCount = info.count;
		if (info.dstControl == this.DMA_INCREMENT_RELOAD) {
			info.nextDest = info.dest;
		}
		this.scheduleDma(number, info);
	}
};

GameBoyAdvanceMMU.prototype.adjustTimings = function(word) {
	var sram = word & 0x0003;
	var ws0 = (word & 0x000C) >> 2;
	var ws0seq = (word & 0x0010) >> 4;
	var ws1 = (word & 0x0060) >> 5;
	var ws1seq = (word & 0x0080) >> 7;
	var ws2 = (word & 0x0300) >> 8;
	var ws2seq = (word & 0x0400) >> 10;
	var prefetch = word & 0x4000;

	this.waitstates[this.REGION_CART_SRAM] = this.ROM_WS[sram];
	this.waitstatesSeq[this.REGION_CART_SRAM] = this.ROM_WS[sram];
	this.waitstates32[this.REGION_CART_SRAM] = this.ROM_WS[sram];
	this.waitstatesSeq32[this.REGION_CART_SRAM] = this.ROM_WS[sram];

	this.waitstates[this.REGION_CART0] = this.waitstates[this.REGION_CART0 + 1] = this.ROM_WS[ws0];
	this.waitstates[this.REGION_CART1] = this.waitstates[this.REGION_CART1 + 1] = this.ROM_WS[ws1];
	this.waitstates[this.REGION_CART2] = this.waitstates[this.REGION_CART2 + 1] = this.ROM_WS[ws2];

	this.waitstatesSeq[this.REGION_CART0] = this.waitstatesSeq[this.REGION_CART0 + 1] = this.ROM_WS_SEQ[0][ws0seq];
	this.waitstatesSeq[this.REGION_CART1] = this.waitstatesSeq[this.REGION_CART1 + 1] = this.ROM_WS_SEQ[1][ws1seq];
	this.waitstatesSeq[this.REGION_CART2] = this.waitstatesSeq[this.REGION_CART2 + 1] = this.ROM_WS_SEQ[2][ws2seq];

	this.waitstates32[this.REGION_CART0] = this.waitstates32[this.REGION_CART0 + 1] = this.waitstates[this.REGION_CART0] + 1 + this.waitstatesSeq[this.REGION_CART0];
	this.waitstates32[this.REGION_CART1] = this.waitstates32[this.REGION_CART1 + 1] = this.waitstates[this.REGION_CART1] + 1 + this.waitstatesSeq[this.REGION_CART1];
	this.waitstates32[this.REGION_CART2] = this.waitstates32[this.REGION_CART2 + 1] = this.waitstates[this.REGION_CART2] + 1 + this.waitstatesSeq[this.REGION_CART2];

	this.waitstatesSeq32[this.REGION_CART0] = this.waitstatesSeq32[this.REGION_CART0 + 1] = 2 * this.waitstatesSeq[this.REGION_CART0] + 1;
	this.waitstatesSeq32[this.REGION_CART1] = this.waitstatesSeq32[this.REGION_CART1 + 1] = 2 * this.waitstatesSeq[this.REGION_CART1] + 1;
	this.waitstatesSeq32[this.REGION_CART2] = this.waitstatesSeq32[this.REGION_CART2 + 1] = 2 * this.waitstatesSeq[this.REGION_CART2] + 1;

	if (prefetch) {
		this.waitstatesPrefetch[this.REGION_CART0] = this.waitstatesPrefetch[this.REGION_CART0 + 1] = 0;
		this.waitstatesPrefetch[this.REGION_CART1] = this.waitstatesPrefetch[this.REGION_CART1 + 1] = 0;
		this.waitstatesPrefetch[this.REGION_CART2] = this.waitstatesPrefetch[this.REGION_CART2 + 1] = 0;

		this.waitstatesPrefetch32[this.REGION_CART0] = this.waitstatesPrefetch32[this.REGION_CART0 + 1] = 0;
		this.waitstatesPrefetch32[this.REGION_CART1] = this.waitstatesPrefetch32[this.REGION_CART1 + 1] = 0;
		this.waitstatesPrefetch32[this.REGION_CART2] = this.waitstatesPrefetch32[this.REGION_CART2 + 1] = 0;
	} else {
		this.waitstatesPrefetch[this.REGION_CART0] = this.waitstatesPrefetch[this.REGION_CART0 + 1] = this.waitstatesSeq[this.REGION_CART0];
		this.waitstatesPrefetch[this.REGION_CART1] = this.waitstatesPrefetch[this.REGION_CART1 + 1] = this.waitstatesSeq[this.REGION_CART1];
		this.waitstatesPrefetch[this.REGION_CART2] = this.waitstatesPrefetch[this.REGION_CART2 + 1] = this.waitstatesSeq[this.REGION_CART2];

		this.waitstatesPrefetch32[this.REGION_CART0] = this.waitstatesPrefetch32[this.REGION_CART0 + 1] = this.waitstatesSeq32[this.REGION_CART0];
		this.waitstatesPrefetch32[this.REGION_CART1] = this.waitstatesPrefetch32[this.REGION_CART1 + 1] = this.waitstatesSeq32[this.REGION_CART1];
		this.waitstatesPrefetch32[this.REGION_CART2] = this.waitstatesPrefetch32[this.REGION_CART2 + 1] = this.waitstatesSeq32[this.REGION_CART2];
	}
};

GameBoyAdvanceMMU.prototype.saveNeedsFlush = function() {
	return this.save.writePending;
};

GameBoyAdvanceMMU.prototype.flushSave = function() {
	this.save.writePending = false;
};

GameBoyAdvanceMMU.prototype.allocGPIO = function(rom) {
	return new GameBoyAdvanceGPIO(this.core, rom);
};