snes9x/sa1.cpp

/*****************************************************************************\
     Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
                This file is licensed under the Snes9x License.
   For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/

#include "snes9x.h"
#include "memmap.h"

uint8	SA1OpenBus;

static void S9xSA1SetBWRAMMemMap (uint8);
static void S9xSetSA1MemMap (uint32, uint8);
static void S9xSA1CharConv2 (void);
static void S9xSA1DMA (void);
static void S9xSA1ReadVariableLengthData (bool8, bool8);


void S9xSA1Init (void)
{
	SA1.Cycles = 0;
	SA1.PrevCycles = 0;
	SA1.Flags = 0;
	SA1.WaitingForInterrupt = FALSE;

	memset(&Memory.FillRAM[0x2200], 0, 0x200);
	Memory.FillRAM[0x2200] = 0x20;
	Memory.FillRAM[0x2220] = 0x00;
	Memory.FillRAM[0x2221] = 0x01;
	Memory.FillRAM[0x2222] = 0x02;
	Memory.FillRAM[0x2223] = 0x03;
	Memory.FillRAM[0x2228] = 0x0f;

	SA1.in_char_dma = FALSE;
	SA1.TimerIRQLastState = FALSE;
	SA1.HTimerIRQPos = 0;
	SA1.VTimerIRQPos = 0;
	SA1.HCounter = 0;
	SA1.VCounter = 0;
	SA1.PrevHCounter = 0;
	SA1.arithmetic_op = 0;
	SA1.op1 = 0;
	SA1.op2 = 0;
	SA1.sum = 0;
	SA1.overflow = FALSE;
	SA1.VirtualBitmapFormat = 4;
	SA1.variable_bit_pos = 0;

	SA1Registers.PBPC = 0;
	SA1Registers.PB = 0;
	SA1Registers.PCw = 0;
	SA1Registers.D.W = 0;
	SA1Registers.DB = 0;
	SA1Registers.SH = 1;
	SA1Registers.SL = 0xFF;
	SA1Registers.XH = 0;
	SA1Registers.YH = 0;
	SA1Registers.P.W = 0;

	SA1.ShiftedPB = 0;
	SA1.ShiftedDB = 0;
	SA1SetFlags(MemoryFlag | IndexFlag | IRQ | Emulation);
	SA1ClearFlags(Decimal);

	SA1.MemSpeed = SLOW_ONE_CYCLE;
	SA1.MemSpeedx2 = SLOW_ONE_CYCLE * 2;

	SA1.S9xOpcodes = S9xSA1OpcodesM1X1;
	SA1.S9xOpLengths = S9xOpLengthsM1X1;

	S9xSA1SetPCBase(SA1Registers.PBPC);

	S9xSA1UnpackStatus();
	S9xSA1FixCycles();

	SA1.BWRAM = Memory.SRAM;

	CPU.IRQExternal = FALSE;
}

static void S9xSA1SetBWRAMMemMap (uint8 val)
{
	if (val & 0x80)
	{
		for (int c = 0; c < 0x400; c += 16)
		{
			SA1.Map[c + 6] = SA1.Map[c + 0x806] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
			SA1.Map[c + 7] = SA1.Map[c + 0x807] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
			SA1.WriteMap[c + 6] = SA1.WriteMap[c + 0x806] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
			SA1.WriteMap[c + 7] = SA1.WriteMap[c + 0x807] = (uint8 *) CMemory::MAP_BWRAM_BITMAP2;
		}

		SA1.BWRAM = Memory.SRAM + (val & 0x7f) * 0x2000 / 4;
	}
	else
	{
		for (int c = 0; c < 0x400; c += 16)
		{
			SA1.Map[c + 6] = SA1.Map[c + 0x806] = (uint8 *) CMemory::MAP_BWRAM;
			SA1.Map[c + 7] = SA1.Map[c + 0x807] = (uint8 *) CMemory::MAP_BWRAM;
			SA1.WriteMap[c + 6] = SA1.WriteMap[c + 0x806] = (uint8 *) CMemory::MAP_BWRAM;
			SA1.WriteMap[c + 7] = SA1.WriteMap[c + 0x807] = (uint8 *) CMemory::MAP_BWRAM;
		}

		SA1.BWRAM = Memory.SRAM + (val & 7) * 0x2000;
	}
}

void S9xSA1PostLoadState (void)
{
	SA1.ShiftedPB = (uint32) SA1Registers.PB << 16;
	SA1.ShiftedDB = (uint32) SA1Registers.DB << 16;

	S9xSA1SetPCBase(SA1Registers.PBPC);
	S9xSA1UnpackStatus();
	S9xSA1FixCycles();
	SA1.VirtualBitmapFormat = (Memory.FillRAM[0x223f] & 0x80) ? 2 : 4;
	Memory.BWRAM = Memory.SRAM + (Memory.FillRAM[0x2224] & 7) * 0x2000;
	S9xSA1SetBWRAMMemMap(Memory.FillRAM[0x2225]);
	S9xSetSA1(Memory.FillRAM[0x2220], 0x2220);
	S9xSetSA1(Memory.FillRAM[0x2221], 0x2221);
	S9xSetSA1(Memory.FillRAM[0x2222], 0x2222);
	S9xSetSA1(Memory.FillRAM[0x2223], 0x2223);
}

static void S9xSetSA1MemMap (uint32 which1, uint8 map)
{
	int	start  = which1 * 0x100 + 0xc00;
	int	start2 = which1 * 0x200;

	if (which1 >= 2)
		start2 += 0x400;

	for (int c = 0; c < 0x100; c += 16)
	{
		uint8 *block;
		if (Multi.cartType != 5)
			block = &Memory.ROM[(map & 7) * 0x100000 + (c << 12)];
		else
		{
			if ((map & 7) < 4)
				block = Memory.ROM + Multi.cartOffsetA + ((map & 7) * 0x100000 + (c << 12));
			else
				block = Memory.ROM + Multi.cartOffsetB + (((map & 7) - 4) * 0x100000 + (c << 12));
		}
		for (int i = c; i < c + 16; i++)
			Memory.Map[start  + i] = SA1.Map[start  + i] = block;
	}

	for (int c = 0; c < 0x200; c += 16)
	{
        // conversion to int is needed here - map is promoted but which1 is not
		int32 offset;
		uint8 *block;
		if (Multi.cartType != 5)
		{
			offset = (((map & 0x80) ? map : which1) & 7) * 0x100000 + (c << 11) - 0x8000;
			block = &Memory.ROM[offset];
		}
		else
		{
			if ((map & 7) < 4)
			{
				offset = (((map & 0x80) ? map : which1) & 7) * 0x100000 + (c << 11) - 0x8000;
				block = Memory.ROM + Multi.cartOffsetA + offset;
			}
			else
			{
				offset = (((map & 0x80) ? (map - 4) : which1) & 7) * 0x100000 + (c << 11) - 0x8000;
				block = Memory.ROM + Multi.cartOffsetB + offset;
			}			
		}
		for (int i = c + 8; i < c + 16; i++)
			Memory.Map[start2 + i] = SA1.Map[start2 + i] = block;
	}
}

uint8 S9xGetSA1 (uint32 address)
{
	switch (address)
	{
		case 0x2300: // S-CPU flag
			return ((Memory.FillRAM[0x2209] & 0x5f) | (Memory.FillRAM[0x2300] & 0xa0));

		case 0x2301: // SA-1 flag
			return ((Memory.FillRAM[0x2200] & 0x0f) | (Memory.FillRAM[0x2301] & 0xf0));

		case 0x2302: // H counter (L)
			SA1.HTimerIRQPos = SA1.HCounter / ONE_DOT_CYCLE;
			SA1.VTimerIRQPos = SA1.VCounter;
			return ((uint8)  SA1.HTimerIRQPos);

		case 0x2303: // H counter (H)
			return ((uint8) (SA1.HTimerIRQPos >> 8));

		case 0x2304: // V counter (L)
			return ((uint8)  SA1.VTimerIRQPos);

		case 0x2305: // V counter (H)
			return ((uint8) (SA1.VTimerIRQPos >> 8));

		case 0x2306: // arithmetic result (LLL)
			return ((uint8)  SA1.sum);

		case 0x2307: // arithmetic result (LLH)
			return ((uint8) (SA1.sum >>  8));

		case 0x2308: // arithmetic result (LHL)
			return ((uint8) (SA1.sum >> 16));

		case 0x2309: // arithmetic result (LLH)
			return ((uint8) (SA1.sum >> 24));

		case 0x230a: // arithmetic result (HLL)
			return ((uint8) (SA1.sum >> 32));

		case 0x230b: // arithmetic overflow
			return (SA1.overflow ? 0x80 : 0);

		case 0x230c: // variable-length data read port (L)
			return (Memory.FillRAM[0x230c]);

		case 0x230d: // variable-length data read port (H)
		{
			uint8	byte = Memory.FillRAM[0x230d];

			if (Memory.FillRAM[0x2258] & 0x80)
				S9xSA1ReadVariableLengthData(TRUE, FALSE);

			return (byte);
		}

		case 0x230e: // version code register
			return (0x01);

		default:
			break;
	}

	return (Memory.FillRAM[address]);
}

void S9xSetSA1 (uint8 byte, uint32 address)
{
	switch (address)
	{
		case 0x2200: // SA-1 control
		#ifdef DEBUGGER
			if (byte & 0x60)
				printf("SA-1 sleep\n");
		#endif

			// SA-1 reset
			if (!(byte & 0x80) && (Memory.FillRAM[0x2200] & 0x20))
			{
			#ifdef DEBUGGER
				printf("SA-1 reset\n");
			#endif
				SA1Registers.PBPC = 0;
				SA1Registers.PB = 0;
				SA1Registers.PCw = Memory.FillRAM[0x2203] | (Memory.FillRAM[0x2204] << 8);
				S9xSA1SetPCBase(SA1Registers.PBPC);
			}

			// SA-1 IRQ control
			if (byte & 0x80)
			{
				Memory.FillRAM[0x2301] |= 0x80;
				if (Memory.FillRAM[0x220a] & 0x80)
					Memory.FillRAM[0x220b] &= ~0x80;
			}

			// SA-1 NMI control
			if (byte & 0x10)
			{
				Memory.FillRAM[0x2301] |= 0x10;
				if (Memory.FillRAM[0x220a] & 0x10)
					Memory.FillRAM[0x220b] &= ~0x10;
			}

			break;

		case 0x2201: // S-CPU interrupt enable
			// S-CPU IRQ enable
			if (((byte ^ Memory.FillRAM[0x2201]) & 0x80) && (Memory.FillRAM[0x2300] & byte & 0x80))
			{
				Memory.FillRAM[0x2202] &= ~0x80;
				CPU.IRQExternal = TRUE;
			}

			// S-CPU CHDMA IRQ enable
			if (((byte ^ Memory.FillRAM[0x2201]) & 0x20) && (Memory.FillRAM[0x2300] & byte & 0x20))
			{
				Memory.FillRAM[0x2202] &= ~0x20;
				CPU.IRQExternal = TRUE;
			}

			break;

		case 0x2202: // S-CPU interrupt clear
			// S-CPU IRQ clear
			if (byte & 0x80)
				Memory.FillRAM[0x2300] &= ~0x80;

			// S-CPU CHDMA IRQ clear
			if (byte & 0x20)
				Memory.FillRAM[0x2300] &= ~0x20;

			if (!(Memory.FillRAM[0x2300] & 0xa0))
				CPU.IRQExternal = FALSE;

			break;

		case 0x2203: // SA-1 reset vector (L)
		case 0x2204: // SA-1 reset vector (H)
		case 0x2205: // SA-1 NMI vector (L)
		case 0x2206: // SA-1 NMI vector (H)
		case 0x2207: // SA-1 IRQ vector (L)
		case 0x2208: // SA-1 IRQ vector (H)
			break;

		case 0x2209: // S-CPU control
			// 0x40: S-CPU IRQ overwrite
			// 0x20: S-CPU NMI overwrite

			// S-CPU IRQ control
			if (byte & 0x80)
			{
				Memory.FillRAM[0x2300] |= 0x80;
				if (Memory.FillRAM[0x2201] & 0x80)
				{
					Memory.FillRAM[0x2202] &= ~0x80;
					CPU.IRQExternal = TRUE;
				}
			}

			break;

		case 0x220a: // SA-1 interrupt enable
			// SA-1 IRQ enable
			if (((byte ^ Memory.FillRAM[0x220a]) & 0x80) && (Memory.FillRAM[0x2301] & byte & 0x80))
				Memory.FillRAM[0x220b] &= ~0x80;

			// SA-1 timer IRQ enable
			if (((byte ^ Memory.FillRAM[0x220a]) & 0x40) && (Memory.FillRAM[0x2301] & byte & 0x40))
				Memory.FillRAM[0x220b] &= ~0x40;

			// SA-1 DMA IRQ enable
			if (((byte ^ Memory.FillRAM[0x220a]) & 0x20) && (Memory.FillRAM[0x2301] & byte & 0x20))
				Memory.FillRAM[0x220b] &= ~0x20;

			// SA-1 NMI enable
			if (((byte ^ Memory.FillRAM[0x220a]) & 0x10) && (Memory.FillRAM[0x2301] & byte & 0x10))
				Memory.FillRAM[0x220b] &= ~0x10;

			break;

		case 0x220b: // SA-1 interrupt clear
			// SA-1 IRQ clear
			if (byte & 0x80)
				Memory.FillRAM[0x2301] &= ~0x80;

			// SA-1 timer IRQ clear
			if (byte & 0x40)
				Memory.FillRAM[0x2301] &= ~0x40;

			// SA-1 DMA IRQ clear
			if (byte & 0x20)
				Memory.FillRAM[0x2301] &= ~0x20;

			// SA-1 NMI clear
			if (byte & 0x10)
				Memory.FillRAM[0x2301] &= ~0x10;

			break;

		case 0x220c: // S-CPU NMI vector (L)
		case 0x220d: // S-CPU NMI vector (H)
		case 0x220e: // S-CPU IRQ vector (L)
		case 0x220f: // S-CPU IRQ vector (H)
			break;

		case 0x2210: // SA-1 timer control
			// 0x80: mode (linear / HV)
			// 0x02: V timer enable
			// 0x01: H timer enable
		#ifdef DEBUGGER
			printf("SA-1 timer control write:%02x\n", byte);
		#endif
			break;

		case 0x2211: // SA-1 timer reset
			SA1.HCounter = 0;
			SA1.VCounter = 0;
			break;

		case 0x2212: // SA-1 H-timer (L)
			SA1.HTimerIRQPos = byte | (Memory.FillRAM[0x2213] << 8);
			break;

		case 0x2213: // SA-1 H-timer (H)
			SA1.HTimerIRQPos = (byte << 8) | Memory.FillRAM[0x2212];
			break;

		case 0x2214: // SA-1 V-timer (L)
			SA1.VTimerIRQPos = byte | (Memory.FillRAM[0x2215] << 8);
			break;

		case 0x2215: // SA-1 V-timer (H)
			SA1.VTimerIRQPos = (byte << 8) | Memory.FillRAM[0x2214];
			break;

		case 0x2220: // MMC bank C
		case 0x2221: // MMC bank D
		case 0x2222: // MMC bank E
		case 0x2223: // MMC bank F
			S9xSetSA1MemMap(address - 0x2220, byte);
			break;

		case 0x2224: // S-CPU BW-RAM mapping
			Memory.BWRAM = Memory.SRAM + (byte & 7) * 0x2000;
			break;

		case 0x2225: // SA-1 BW-RAM mapping
			if (byte != Memory.FillRAM[0x2225])
				S9xSA1SetBWRAMMemMap(byte);

			break;

		case 0x2226: // S-CPU BW-RAM write enable
		case 0x2227: // SA-1 BW-RAM write enable
		case 0x2228: // BW-RAM write-protected area
		case 0x2229: // S-CPU I-RAM write protection
		case 0x222a: // SA-1 I-RAM write protection
			break;

		case 0x2230: // DMA control
			// 0x80: enable
			// 0x40: priority (DMA / SA-1)
			// 0x20: character conversion / normal
			// 0x10: BW-RAM -> I-RAM / SA-1 -> I-RAM
			// 0x04: destinatin (BW-RAM / I-RAM)
			// 0x03: source
			break;

		case 0x2231: // character conversion DMA parameters
			// 0x80: CHDEND (complete / incomplete)
			// 0x03: color mode
			// (byte >> 2) & 7: virtual VRAM width
			if (byte & 0x80)
				SA1.in_char_dma = FALSE;

			break;

		case 0x2232: // DMA source start address (LL)
		case 0x2233: // DMA source start address (LH)
		case 0x2234: // DMA source start address (HL)
			break;

		case 0x2235: // DMA destination start address (LL)
			break;

		case 0x2236: // DMA destination start address (LH)
			Memory.FillRAM[0x2236] = byte;

			if ((Memory.FillRAM[0x2230] & 0xa4) == 0x80) // Normal DMA to I-RAM
				S9xSA1DMA();
			else
			if ((Memory.FillRAM[0x2230] & 0xb0) == 0xb0) // CC1
			{
				SA1.in_char_dma = TRUE;

				Memory.FillRAM[0x2300] |= 0x20;
				if (Memory.FillRAM[0x2201] & 0x20)
				{
					Memory.FillRAM[0x2202] &= ~0x20;
					CPU.IRQExternal = TRUE;
				}
			}

			break;

		case 0x2237: // DMA destination start address (HL)
			Memory.FillRAM[0x2237] = byte;

			if ((Memory.FillRAM[0x2230] & 0xa4) == 0x84) // Normal DMA to BW-RAM
				S9xSA1DMA();

			break;

		case 0x2238: // DMA terminal counter (L)
		case 0x2239: // DMA terminal counter (H)
			break;

		case 0x223f: // BW-RAM bitmap format
			SA1.VirtualBitmapFormat = (byte & 0x80) ? 2 : 4;
			break;

		case 0x2240: // bitmap register 0
		case 0x2241: // bitmap register 1
		case 0x2242: // bitmap register 2
		case 0x2243: // bitmap register 3
		case 0x2244: // bitmap register 4
		case 0x2245: // bitmap register 5
		case 0x2246: // bitmap register 6
		case 0x2247: // bitmap register 7
		case 0x2248: // bitmap register 8
		case 0x2249: // bitmap register 9
		case 0x224a: // bitmap register A
		case 0x224b: // bitmap register B
		case 0x224c: // bitmap register C
		case 0x224d: // bitmap register D
		case 0x224e: // bitmap register E
			break;

		case 0x224f: // bitmap register F
			Memory.FillRAM[0x224f] = byte;

			if ((Memory.FillRAM[0x2230] & 0xb0) == 0xa0) // CC2
			{
				memmove(&Memory.ROM[CMemory::MAX_ROM_SIZE - 0x10000] + SA1.in_char_dma * 16, &Memory.FillRAM[0x2240], 16);
				SA1.in_char_dma = (SA1.in_char_dma + 1) & 7;
				if ((SA1.in_char_dma & 3) == 0)
					S9xSA1CharConv2();
			}

			break;

		case 0x2250: // arithmetic control
			if (byte & 2)
				SA1.sum = 0;
			SA1.arithmetic_op = byte & 3;
			break;

		case 0x2251: // multiplicand / dividend (L)
			SA1.op1 = (SA1.op1 & 0xff00) |  byte;
			break;

		case 0x2252: // multiplicand / dividend (H)
			SA1.op1 = (SA1.op1 & 0x00ff) | (byte << 8);
			break;

		case 0x2253: // multiplier / divisor (L)
			SA1.op2 = (SA1.op2 & 0xff00) |  byte;
			break;

		case 0x2254: // multiplier / divisor (H)
			SA1.op2 = (SA1.op2 & 0x00ff) | (byte << 8);

			switch (SA1.arithmetic_op)
			{
				case 0:	// signed multiplication
					SA1.sum = (int16) SA1.op1 * (int16) SA1.op2;
					SA1.op2 = 0;
					break;

				case 1: // unsigned division
					if (SA1.op2 == 0)
						SA1.sum = 0;
					else
					{
						int16 dividend = (int16) SA1.op1;
						uint16 divisor = (uint16) SA1.op2;
						uint16	remainder = (dividend >= 0) ? dividend % divisor : (dividend % divisor) + divisor;
						uint16	quotient  = (dividend - remainder) / divisor;
						SA1.sum = (remainder << 16) | quotient;
					}

					SA1.op1 = 0;
					SA1.op2 = 0;
					break;

				case 2: // cumulative sum
				default:
					SA1.sum += (int16) SA1.op1 * (int16) SA1.op2;
					SA1.overflow = (SA1.sum >= (1ULL << 40));
					SA1.sum &= (1ULL << 40) - 1;
					SA1.op2 = 0;
					break;
			}

			break;

		case 0x2258: // variable bit-field length / auto inc / start
			Memory.FillRAM[0x2258] = byte;
			S9xSA1ReadVariableLengthData(TRUE, FALSE);
			return;

		case 0x2259: // variable bit-field start address (LL)
		case 0x225a: // variable bit-field start address (LH)
		case 0x225b: // variable bit-field start address (HL)
			Memory.FillRAM[address] = byte;
			// XXX: ???
			SA1.variable_bit_pos = 0;
			S9xSA1ReadVariableLengthData(FALSE, TRUE);
			return;

		default:
			break;
	}

	if (address >= 0x2200 && address <= 0x22ff)
		Memory.FillRAM[address] = byte;
}

static void S9xSA1CharConv2 (void)
{
	uint32	dest           = Memory.FillRAM[0x2235] | (Memory.FillRAM[0x2236] << 8);
	uint32	offset         = (SA1.in_char_dma & 7) ? 0 : 1;
	int		depth          = (Memory.FillRAM[0x2231] & 3) == 0 ? 8 : (Memory.FillRAM[0x2231] & 3) == 1 ? 4 : 2;
	int		bytes_per_char = 8 * depth;
	uint8	*p             = &Memory.FillRAM[0x3000] + (dest & 0x7ff) + offset * bytes_per_char;
	uint8	*q             = &Memory.ROM[CMemory::MAX_ROM_SIZE - 0x10000] + offset * 64;

	switch (depth)
	{
		case 2:
			for (int l = 0; l < 8; l++, q += 8)
			{
				for (int b = 0; b < 8; b++)
				{
					uint8	r = *(q + b);
					*(p +  0) = (*(p +  0) << 1) | ((r >> 0) & 1);
					*(p +  1) = (*(p +  1) << 1) | ((r >> 1) & 1);
				}

				p += 2;
			}

			break;

		case 4:
			for (int l = 0; l < 8; l++, q += 8)
			{
				for (int b = 0; b < 8; b++)
				{
					uint8	r = *(q + b);
					*(p +  0) = (*(p +  0) << 1) | ((r >> 0) & 1);
					*(p +  1) = (*(p +  1) << 1) | ((r >> 1) & 1);
					*(p + 16) = (*(p + 16) << 1) | ((r >> 2) & 1);
					*(p + 17) = (*(p + 17) << 1) | ((r >> 3) & 1);
				}

				p += 2;
			}

			break;

		case 8:
			for (int l = 0; l < 8; l++, q += 8)
			{
				for (int b = 0; b < 8; b++)
				{
					uint8	r = *(q + b);
					*(p +  0) = (*(p +  0) << 1) | ((r >> 0) & 1);
					*(p +  1) = (*(p +  1) << 1) | ((r >> 1) & 1);
					*(p + 16) = (*(p + 16) << 1) | ((r >> 2) & 1);
					*(p + 17) = (*(p + 17) << 1) | ((r >> 3) & 1);
					*(p + 32) = (*(p + 32) << 1) | ((r >> 4) & 1);
					*(p + 33) = (*(p + 33) << 1) | ((r >> 5) & 1);
					*(p + 48) = (*(p + 48) << 1) | ((r >> 6) & 1);
					*(p + 49) = (*(p + 49) << 1) | ((r >> 7) & 1);
				}

				p += 2;
			}

			break;
	}
}

static void S9xSA1DMA (void)
{
	uint32	src = Memory.FillRAM[0x2232] | (Memory.FillRAM[0x2233] << 8) | (Memory.FillRAM[0x2234] << 16);
	uint32	dst = Memory.FillRAM[0x2235] | (Memory.FillRAM[0x2236] << 8) | (Memory.FillRAM[0x2237] << 16);
	uint32	len = Memory.FillRAM[0x2238] | (Memory.FillRAM[0x2239] << 8);
	uint8	*s, *d;

	switch (Memory.FillRAM[0x2230] & 3)
	{
		case 0: // ROM
			s = SA1.Map[((src & 0xffffff) >> MEMMAP_SHIFT)];
			if (s >= (uint8 *) CMemory::MAP_LAST)
				s += (src & 0xffff);
			else
				s = Memory.ROM + (src & 0xffff);
			break;

		case 1: // BW-RAM
			src &= Memory.SRAMMask;
			len &= Memory.SRAMMask;
			s = Memory.SRAM + src;
			break;

		default:
		case 2:
			src &= 0x3ff;
			len &= 0x3ff;
			s = &Memory.FillRAM[0x3000] + src;
			break;
	}

	if (Memory.FillRAM[0x2230] & 4)
	{
		dst &= Memory.SRAMMask;
		len &= Memory.SRAMMask;
		d = Memory.SRAM + dst;
	}
	else
	{
		dst &= 0x3ff;
		len &= 0x3ff;
		d = &Memory.FillRAM[0x3000] + dst;
	}

	memmove(d, s, len);

	// SA-1 DMA IRQ control
	Memory.FillRAM[0x2301] |= 0x20;
	if (Memory.FillRAM[0x220a] & 0x20)
		Memory.FillRAM[0x220b] &= ~0x20;
}

static void S9xSA1ReadVariableLengthData (bool8 inc, bool8 no_shift)
{
	uint32	addr  = Memory.FillRAM[0x2259] | (Memory.FillRAM[0x225a] << 8) | (Memory.FillRAM[0x225b] << 16);
	uint8	shift = Memory.FillRAM[0x2258] & 15;

	if (no_shift)
		shift = 0;
	else
	if (shift == 0)
		shift = 16;

	uint8	s = shift + SA1.variable_bit_pos;

	if (s >= 16)
	{
		addr += (s >> 4) << 1;
		s &= 15;
	}

	uint32	data = S9xSA1GetWord(addr) | (S9xSA1GetWord(addr + 2) << 16);

	data >>= s;
	Memory.FillRAM[0x230c] = (uint8) data;
	Memory.FillRAM[0x230d] = (uint8) (data >> 8);

	if (inc)
	{
		SA1.variable_bit_pos = (SA1.variable_bit_pos + shift) & 15;
		Memory.FillRAM[0x2259] = (uint8) addr;
		Memory.FillRAM[0x225a] = (uint8) (addr >> 8);
		Memory.FillRAM[0x225b] = (uint8) (addr >> 16);
	}
}

uint8 S9xSA1GetByte (uint32 address)
{
	uint8	*GetAddress = SA1.Map[(address & 0xffffff) >> MEMMAP_SHIFT];

	if (GetAddress >= (uint8 *) CMemory::MAP_LAST)
		return (*(GetAddress + (address & 0xffff)));

	switch ((pint) GetAddress)
	{
		case CMemory::MAP_PPU:
			return (S9xGetSA1(address & 0xffff));

		case CMemory::MAP_LOROM_SRAM:
		case CMemory::MAP_SA1RAM:
			return (*(Memory.SRAM + (address & 0xffff)));

		case CMemory::MAP_BWRAM:
			return (*(SA1.BWRAM + ((address & 0x7fff) - 0x6000)));

		case CMemory::MAP_BWRAM_BITMAP:
			address -= 0x600000;
			if (SA1.VirtualBitmapFormat == 2)
				return ((Memory.SRAM[(address >> 2) & 0xffff] >> ((address & 3) << 1)) &  3);
			else
				return ((Memory.SRAM[(address >> 1) & 0xffff] >> ((address & 1) << 2)) & 15);

		case CMemory::MAP_BWRAM_BITMAP2:
			address = (address & 0xffff) - 0x6000;
			if (SA1.VirtualBitmapFormat == 2)
				return ((SA1.BWRAM[(address >> 2) & 0xffff] >> ((address & 3) << 1)) &  3);
			else
				return ((SA1.BWRAM[(address >> 1) & 0xffff] >> ((address & 1) << 2)) & 15);

		default:
			return (SA1OpenBus);
	}
}

uint16 S9xSA1GetWord (uint32 address, s9xwrap_t w)
{
	PC_t	a;

	SA1OpenBus = S9xSA1GetByte(address);

	switch (w)
	{
		case WRAP_PAGE:
			a.xPBPC = address;
			a.B.xPCl++;
			return (SA1OpenBus | (S9xSA1GetByte(a.xPBPC) << 8));

		case WRAP_BANK:
			a.xPBPC = address;
			a.W.xPC++;
			return (SA1OpenBus | (S9xSA1GetByte(a.xPBPC) << 8));

		case WRAP_NONE:
		default:
			return (SA1OpenBus | (S9xSA1GetByte(address + 1) << 8));
	}
}

void S9xSA1SetByte (uint8 byte, uint32 address)
{
	uint8	*SetAddress = SA1.WriteMap[(address & 0xffffff) >> MEMMAP_SHIFT];

	if (SetAddress >= (uint8 *) CMemory::MAP_LAST)
	{
		*(SetAddress + (address & 0xffff)) = byte;
		return;
	}

	switch ((pint) SetAddress)
	{
		case CMemory::MAP_PPU:
			S9xSetSA1(byte, address & 0xffff);
			return;

		case CMemory::MAP_LOROM_SRAM:
		case CMemory::MAP_SA1RAM:
			*(Memory.SRAM + (address & 0xffff)) = byte;
			return;

		case CMemory::MAP_BWRAM:
			*(SA1.BWRAM + ((address & 0x7fff) - 0x6000)) = byte;
			return;

		case CMemory::MAP_BWRAM_BITMAP:
			address -= 0x600000;
			if (SA1.VirtualBitmapFormat == 2)
			{
				uint8	*ptr = &Memory.SRAM[(address >> 2) & 0xffff];
				*ptr &= ~(3  << ((address & 3) << 1));
				*ptr |= (byte &  3) << ((address & 3) << 1);
			}
			else
			{
				uint8	*ptr = &Memory.SRAM[(address >> 1) & 0xffff];
				*ptr &= ~(15 << ((address & 1) << 2));
				*ptr |= (byte & 15) << ((address & 1) << 2);
			}

			return;

		case CMemory::MAP_BWRAM_BITMAP2:
			address = (address & 0xffff) - 0x6000;
			if (SA1.VirtualBitmapFormat == 2)
			{
				uint8	*ptr = &SA1.BWRAM[(address >> 2) & 0xffff];
				*ptr &= ~(3  << ((address & 3) << 1));
				*ptr |= (byte &  3) << ((address & 3) << 1);
			}
			else
			{
				uint8	*ptr = &SA1.BWRAM[(address >> 1) & 0xffff];
				*ptr &= ~(15 << ((address & 1) << 2));
				*ptr |= (byte & 15) << ((address & 1) << 2);
			}

			return;

		default:
			return;
	}
}

void S9xSA1SetWord (uint16 Word, uint32 address, enum s9xwrap_t w, enum s9xwriteorder_t o)
{
	PC_t	a;

	if (!o)
		S9xSA1SetByte((uint8) Word, address);

	switch (w)
	{
		case WRAP_PAGE:
			a.xPBPC = address;
			a.B.xPCl++;
			S9xSA1SetByte(Word >> 8, a.xPBPC);
			break;

		case WRAP_BANK:
			a.xPBPC = address;
			a.W.xPC++;
			S9xSA1SetByte(Word >> 8, a.xPBPC);
			break;

		case WRAP_NONE:
		default:
			S9xSA1SetByte(Word >> 8, address + 1);
			break;
	}

	if (o)
		S9xSA1SetByte((uint8) Word, address);
}

void S9xSA1SetPCBase (uint32 address)
{
	SA1Registers.PBPC = address & 0xffffff;
	SA1.ShiftedPB = address & 0xff0000;

	// FIXME
	SA1.MemSpeed = memory_speed(address);
	SA1.MemSpeedx2 = SA1.MemSpeed << 1;

	uint8	*GetAddress = SA1.Map[(address & 0xffffff) >> MEMMAP_SHIFT];

	if (GetAddress >= (uint8 *) CMemory::MAP_LAST)
	{
		SA1.PCBase = GetAddress;
		return;
	}

	switch ((pint) GetAddress)
	{
		case CMemory::MAP_LOROM_SRAM:
			if ((Memory.SRAMMask & MEMMAP_MASK) != MEMMAP_MASK)
				SA1.PCBase = NULL;
			else
				SA1.PCBase = (Memory.SRAM + ((((address & 0xff0000) >> 1) | (address & 0x7fff)) & Memory.SRAMMask)) - (address & 0xffff);
			return;

		case CMemory::MAP_HIROM_SRAM:
			if ((Memory.SRAMMask & MEMMAP_MASK) != MEMMAP_MASK)
				SA1.PCBase = NULL;
			else
				SA1.PCBase = (Memory.SRAM + (((address & 0x7fff) - 0x6000 + ((address & 0xf0000) >> 3)) & Memory.SRAMMask)) - (address & 0xffff);
			return;

		case CMemory::MAP_BWRAM:
			SA1.PCBase = SA1.BWRAM - 0x6000 - (address & 0x8000);
			return;

		case CMemory::MAP_SA1RAM:
			SA1.PCBase = Memory.SRAM;
			return;

		default:
			SA1.PCBase = NULL;
			return;
	}
}