static INLINE bool8 HDMAReadLineCount (int d)
{
/* CPU.InDMA is set, so S9xGetXXX() / S9xSetXXX() incur no charges. */
uint8 line;
line = S9xGetByte((DMA[d].ABank << 16) + DMA[d].Address);
CPU.Cycles += SLOW_ONE_CYCLE;
DMA[d].LineCount = 128;
if (!line)
{
DMA[d].Repeat = FALSE;
if (DMA[d].HDMAIndirectAddressing)
{
if (PPU.HDMA & (0xfe << d))
{
DMA[d].Address++;
CPU.Cycles += (SLOW_ONE_CYCLE << 1);
}
else
CPU.Cycles += SLOW_ONE_CYCLE;
DMA[d].IndirectAddress = S9xGetWord((DMA[d].ABank << 16) + DMA[d].Address, WRAP_NONE);
DMA[d].Address++;
}
DMA[d].Address++;
HDMAMemPointers[d] = NULL;
return (FALSE);
}
else
if (line == 0x80)
DMA[d].Repeat = TRUE;
else
{
DMA[d].Repeat = !(line & 0x80);
DMA[d].LineCount = line & 0x7f;
}
DMA[d].Address++;
DMA[d].DoTransfer = TRUE;
if (DMA[d].HDMAIndirectAddressing)
{
CPU.Cycles += (SLOW_ONE_CYCLE << 1);
DMA[d].IndirectAddress = S9xGetWord((DMA[d].ABank << 16) + DMA[d].Address, WRAP_NONE);
DMA[d].Address += 2;
HDMAMemPointers[d] = S9xGetMemPointer((DMA[d].IndirectBank << 16) + DMA[d].IndirectAddress);
}
else
HDMAMemPointers[d] = S9xGetMemPointer((DMA[d].ABank << 16) + DMA[d].Address);
return (TRUE);
}
void C4LoaDMem(char *C4RAM)
{
memmove(C4RAM+(READ_WORD(C4RAM+0x1f45)&0x1fff),
S9xGetMemPointer(READ_3WORD(C4RAM+0x1f40)),
READ_WORD(C4RAM+0x1f43));
}
static uint8 S9xDoHDMA (uint8 byte)
{
uint8 mask;
uint32 ShiftedIBank;
uint16 IAddr;
bool8 temp;
int32 tmpch;
int d;
struct SDMA *p;
p = &DMA[0];
d = 0;
CPU.InHDMA = TRUE;
CPU.InDMAorHDMA = TRUE;
CPU.HDMARanInDMA = CPU.InDMA ? byte : 0;
temp = CPU.InWRAMDMAorHDMA;
tmpch = CPU.CurrentDMAorHDMAChannel;
/* XXX: Not quite right... */
CPU.Cycles += Timings.DMACPUSync;
for ( mask = 1; mask; mask <<= 1, p++, d++)
{
if (byte & mask)
{
CPU.InWRAMDMAorHDMA = FALSE;
CPU.CurrentDMAorHDMAChannel = d;
if (p->HDMAIndirectAddressing)
{
ShiftedIBank = (p->IndirectBank << 16);
IAddr = p->IndirectAddress;
}
else
{
ShiftedIBank = (p->ABank << 16);
IAddr = p->Address;
}
if (!HDMAMemPointers[d])
HDMAMemPointers[d] = S9xGetMemPointer(ShiftedIBank + IAddr);
if (p->DoTransfer)
{
/* XXX: Hack for Uniracers, because we don't understand
OAM Address Invalidation */
if (p->BAddress == 0x04 && SNESGameFixes.Uniracers)
{
PPU.OAMAddr = 0x10c;
PPU.OAMFlip = 0;
}
if (!p->ReverseTransfer)
{
if ((IAddr & MEMMAP_MASK) + HDMA_ModeByteCounts[p->TransferMode] >= MEMMAP_BLOCK_SIZE)
{
/* HDMA REALLY-SLOW PATH */
HDMAMemPointers[d] = NULL;
#define DOBYTE(Addr, RegOff) \
CPU.InWRAMDMAorHDMA = (ShiftedIBank == 0x7e0000 || ShiftedIBank == 0x7f0000 || \
(!(ShiftedIBank & 0x400000) && ((uint16) (Addr)) < 0x2000)); \
S9xSetPPU(S9xGetByte(ShiftedIBank + ((uint16) (Addr))), 0x2100 + p->BAddress + (RegOff));
DOBYTE(IAddr, 0);
CPU.Cycles += SLOW_ONE_CYCLE;
switch (p->TransferMode)
{
case 0:
break;
case 5:
DOBYTE(IAddr + 1, 1);
CPU.Cycles += SLOW_ONE_CYCLE;
DOBYTE(IAddr + 2, 0);
CPU.Cycles += SLOW_ONE_CYCLE;
DOBYTE(IAddr + 3, 1);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
case 1:
DOBYTE(IAddr + 1, 1);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
case 2:
case 6:
DOBYTE(IAddr + 1, 0);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
case 3:
case 7:
DOBYTE(IAddr + 1, 0);
CPU.Cycles += SLOW_ONE_CYCLE;
DOBYTE(IAddr + 2, 1);
CPU.Cycles += SLOW_ONE_CYCLE;
DOBYTE(IAddr + 3, 1);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
case 4:
DOBYTE(IAddr + 1, 1);
CPU.Cycles += SLOW_ONE_CYCLE;
DOBYTE(IAddr + 2, 2);
CPU.Cycles += SLOW_ONE_CYCLE;
DOBYTE(IAddr + 3, 3);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
}
#undef DOBYTE
}
else
{
CPU.InWRAMDMAorHDMA = (ShiftedIBank == 0x7e0000 || ShiftedIBank == 0x7f0000 ||
(!(ShiftedIBank & 0x400000) && IAddr < 0x2000));
if (!HDMAMemPointers[d])
{
/* HDMA SLOW PATH */
uint32 Addr = ShiftedIBank + IAddr;
switch (p->TransferMode)
{
case 0:
S9xSetPPU(S9xGetByte(Addr), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
case 5:
S9xSetPPU(S9xGetByte(Addr + 0), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(S9xGetByte(Addr + 1), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
Addr += 2;
/* fall through */
case 1:
S9xSetPPU(S9xGetByte(Addr + 0), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(S9xGetByte(Addr + 1), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
case 2:
case 6:
S9xSetPPU(S9xGetByte(Addr + 0), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(S9xGetByte(Addr + 1), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
case 3:
case 7:
S9xSetPPU(S9xGetByte(Addr + 0), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(S9xGetByte(Addr + 1), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(S9xGetByte(Addr + 2), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(S9xGetByte(Addr + 3), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
case 4:
S9xSetPPU(S9xGetByte(Addr + 0), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(S9xGetByte(Addr + 1), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(S9xGetByte(Addr + 2), 0x2102 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(S9xGetByte(Addr + 3), 0x2103 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
}
}
else
{
/* HDMA FAST PATH */
switch (p->TransferMode)
{
case 0:
S9xSetPPU(*HDMAMemPointers[d]++, 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
break;
case 5:
S9xSetPPU(*(HDMAMemPointers[d]), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(*(HDMAMemPointers[d] + 1), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
HDMAMemPointers[d] += 2;
/* fall through */
case 1:
S9xSetPPU(*(HDMAMemPointers[d]), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(*(HDMAMemPointers[d] + 1), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
HDMAMemPointers[d] += 2;
break;
case 2:
case 6:
S9xSetPPU(*(HDMAMemPointers[d]), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(*(HDMAMemPointers[d] + 1), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
HDMAMemPointers[d] += 2;
break;
case 3:
case 7:
S9xSetPPU(*(HDMAMemPointers[d]), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(*(HDMAMemPointers[d] + 1), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(*(HDMAMemPointers[d] + 2), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(*(HDMAMemPointers[d] + 3), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
HDMAMemPointers[d] += 4;
break;
case 4:
S9xSetPPU(*(HDMAMemPointers[d]), 0x2100 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(*(HDMAMemPointers[d] + 1), 0x2101 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(*(HDMAMemPointers[d] + 2), 0x2102 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
S9xSetPPU(*(HDMAMemPointers[d] + 3), 0x2103 + p->BAddress);
CPU.Cycles += SLOW_ONE_CYCLE;
HDMAMemPointers[d] += 4;
break;
}
}
}
}
if (p->HDMAIndirectAddressing)
p->IndirectAddress += HDMA_ModeByteCounts[p->TransferMode];
else
p->Address += HDMA_ModeByteCounts[p->TransferMode];
}
p->DoTransfer = !p->Repeat;
if (!--p->LineCount)
{
if (!HDMAReadLineCount(d))
{
byte &= ~mask;
PPU.HDMAEnded |= mask;
p->DoTransfer = FALSE;
continue;
}
}
else
CPU.Cycles += SLOW_ONE_CYCLE;
}
}
CPU.InHDMA = FALSE;
CPU.InDMAorHDMA = CPU.InDMA;
CPU.InWRAMDMAorHDMA = temp;
CPU.CurrentDMAorHDMAChannel = tmpch;
return (byte);
}
