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dma.cpp
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dma.cpp
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/*****************************************************************************\
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"
#include "dma.h"
#include "apu/apu.h"
#include "sdd1emu.h"
#include "spc7110emu.h"
#ifdef DEBUGGER
#include "missing.h"
#endif
#define ADD_CYCLES(n) { CPU.Cycles += (n); }
extern uint8 *HDMAMemPointers[8];
extern int HDMA_ModeByteCounts[8];
extern SPC7110 s7emu;
static uint8 sdd1_decode_buffer[0x10000];
static inline bool8 addCyclesInDMA (uint8);
static inline bool8 HDMAReadLineCount (int);
static inline bool8 addCyclesInDMA (uint8 dma_channel)
{
// Add 8 cycles per byte, sync APU, and do HC related events.
// If HDMA was done in S9xDoHEventProcessing(), check if it used the same channel as DMA.
ADD_CYCLES(SLOW_ONE_CYCLE);
while (CPU.Cycles >= CPU.NextEvent)
S9xDoHEventProcessing();
if (CPU.HDMARanInDMA & (1 << dma_channel))
{
CPU.HDMARanInDMA = 0;
#ifdef DEBUGGER
printf("HDMA and DMA use the same channel %d!\n", dma_channel);
#endif
// If HDMA triggers in the middle of DMA transfer and it uses the same channel,
// it kills the DMA transfer immediately. $43x2 and $43x5 stop updating.
return (FALSE);
}
CPU.HDMARanInDMA = 0;
return (TRUE);
}
bool8 S9xDoDMA (uint8 Channel)
{
CPU.InDMA = TRUE;
CPU.InDMAorHDMA = TRUE;
CPU.CurrentDMAorHDMAChannel = Channel;
SDMA *d = &DMA[Channel];
// Check invalid DMA first
if ((d->ABank == 0x7E || d->ABank == 0x7F) && d->BAddress == 0x80 && !d->ReverseTransfer)
{
// Attempting a DMA from WRAM to $2180 will not work, WRAM will not be written.
// Attempting a DMA from $2180 to WRAM will similarly not work,
// the value written is (initially) the OpenBus value.
// In either case, the address in $2181-3 is not incremented.
// Does an invalid DMA actually take time?
// I'd say yes, since 'invalid' is probably just the WRAM chip
// not being able to read and write itself at the same time
// And no, PPU.WRAM should not be updated.
int32 c = d->TransferBytes;
// Writing $0000 to $43x5 actually results in a transfer of $10000 bytes, not 0.
if (c == 0)
c = 0x10000;
// 8 cycles per channel
ADD_CYCLES(SLOW_ONE_CYCLE);
// 8 cycles per byte
while (c)
{
d->TransferBytes--;
d->AAddress++;
c--;
if (!addCyclesInDMA(Channel))
{
CPU.InDMA = FALSE;
CPU.InDMAorHDMA = FALSE;
CPU.CurrentDMAorHDMAChannel = -1;
return (FALSE);
}
}
#ifdef DEBUGGER
if (Settings.TraceDMA)
{
sprintf(String, "DMA[%d]: WRAM Bank:%02X->$2180", Channel, d->ABank);
S9xMessage(S9X_TRACE, S9X_DMA_TRACE, String);
}
#endif
CPU.InDMA = FALSE;
CPU.InDMAorHDMA = FALSE;
CPU.CurrentDMAorHDMAChannel = -1;
return (TRUE);
}
// Prepare for accessing $2118-2119
switch (d->BAddress)
{
case 0x18:
case 0x19:
if (IPPU.RenderThisFrame)
FLUSH_REDRAW();
break;
}
int32 inc = d->AAddressFixed ? 0 : (!d->AAddressDecrement ? 1 : -1);
int32 count = d->TransferBytes;
// Writing $0000 to $43x5 actually results in a transfer of $10000 bytes, not 0.
if (count == 0)
count = 0x10000;
// Prepare for custom chip DMA
// S-DD1
uint8 *in_sdd1_dma = NULL;
if (Settings.SDD1)
{
if (d->AAddressFixed && Memory.FillRAM[0x4801] > 0)
{
// XXX: Should probably verify that we're DMAing from ROM?
// And somewhere we should make sure we're not running across a mapping boundary too.
// Hacky support for pre-decompressed S-DD1 data
inc = !d->AAddressDecrement ? 1 : -1;
uint8 *in_ptr = S9xGetBasePointer(((d->ABank << 16) | d->AAddress));
if (in_ptr)
{
in_ptr += d->AAddress;
SDD1_decompress(sdd1_decode_buffer, in_ptr, d->TransferBytes);
}
#ifdef DEBUGGER
else
{
sprintf(String, "S-DD1: DMA from non-block address $%02X:%04X", d->ABank, d->AAddress);
S9xMessage(S9X_WARNING, S9X_DMA_TRACE, String);
}
#endif
in_sdd1_dma = sdd1_decode_buffer;
}
Memory.FillRAM[0x4801] = 0;
}
// SPC7110
uint8 *spc7110_dma = NULL;
if (Settings.SPC7110)
{
if (d->AAddress == 0x4800 || d->ABank == 0x50)
{
spc7110_dma = new uint8[d->TransferBytes];
for (int i = 0; i < d->TransferBytes; i++)
spc7110_dma[i] = s7emu.decomp.read();
int32 icount = s7emu.r4809 | (s7emu.r480a << 8);
icount -= d->TransferBytes;
s7emu.r4809 = icount & 0x00ff;
s7emu.r480a = (icount & 0xff00) >> 8;
inc = 1;
d->AAddress -= count;
}
}
// SA-1
bool8 in_sa1_dma = FALSE;
if (Settings.SA1)
{
if (SA1.in_char_dma && d->BAddress == 0x18 && (d->ABank & 0xf0) == 0x40)
{
// Perform packed bitmap to PPU character format conversion on the data
// before transmitting it to V-RAM via-DMA.
int32 num_chars = 1 << ((Memory.FillRAM[0x2231] >> 2) & 7);
int32 depth = (Memory.FillRAM[0x2231] & 3) == 0 ? 8 : (Memory.FillRAM[0x2231] & 3) == 1 ? 4 : 2;
int32 bytes_per_char = 8 * depth;
int32 bytes_per_line = depth * num_chars;
int32 char_line_bytes = bytes_per_char * num_chars;
uint32 addr = (d->AAddress / char_line_bytes) * char_line_bytes;
uint8 *base = S9xGetBasePointer((d->ABank << 16) + addr);
if (!base)
{
sprintf(String, "SA-1: DMA from non-block address $%02X:%04X", d->ABank, addr);
S9xMessage(S9X_WARNING, S9X_DMA_TRACE, String);
base = Memory.ROM;
}
base += addr;
uint8 *buffer = &Memory.ROM[CMemory::MAX_ROM_SIZE - 0x10000];
uint8 *p = buffer;
uint32 inc_sa1 = char_line_bytes - (d->AAddress % char_line_bytes);
uint32 char_count = inc_sa1 / bytes_per_char;
in_sa1_dma = TRUE;
#if 0
printf("SA-1 DMA: %08x,", base);
printf("depth = %d, count = %d, bytes_per_char = %d, bytes_per_line = %d, num_chars = %d, char_line_bytes = %d\n",
depth, count, bytes_per_char, bytes_per_line, num_chars, char_line_bytes);
#endif
switch (depth)
{
case 2:
for (int32 i = 0; i < count; i += inc_sa1, base += char_line_bytes, inc_sa1 = char_line_bytes, char_count = num_chars)
{
uint8 *line = base + (num_chars - char_count) * 2;
for (uint32 j = 0; j < char_count && p - buffer < count; j++, line += 2)
{
uint8 *q = line;
for (int32 l = 0; l < 8; l++, q += bytes_per_line)
{
for (int32 b = 0; b < 2; b++)
{
uint8 r = *(q + b);
*(p + 0) = (*(p + 0) << 1) | ((r >> 0) & 1);
*(p + 1) = (*(p + 1) << 1) | ((r >> 1) & 1);
*(p + 0) = (*(p + 0) << 1) | ((r >> 2) & 1);
*(p + 1) = (*(p + 1) << 1) | ((r >> 3) & 1);
*(p + 0) = (*(p + 0) << 1) | ((r >> 4) & 1);
*(p + 1) = (*(p + 1) << 1) | ((r >> 5) & 1);
*(p + 0) = (*(p + 0) << 1) | ((r >> 6) & 1);
*(p + 1) = (*(p + 1) << 1) | ((r >> 7) & 1);
}
p += 2;
}
}
}
break;
case 4:
for (int32 i = 0; i < count; i += inc_sa1, base += char_line_bytes, inc_sa1 = char_line_bytes, char_count = num_chars)
{
uint8 *line = base + (num_chars - char_count) * 4;
for (uint32 j = 0; j < char_count && p - buffer < count; j++, line += 4)
{
uint8 *q = line;
for (int32 l = 0; l < 8; l++, q += bytes_per_line)
{
for (int32 b = 0; b < 4; 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 + 0) = (*(p + 0) << 1) | ((r >> 4) & 1);
*(p + 1) = (*(p + 1) << 1) | ((r >> 5) & 1);
*(p + 16) = (*(p + 16) << 1) | ((r >> 6) & 1);
*(p + 17) = (*(p + 17) << 1) | ((r >> 7) & 1);
}
p += 2;
}
p += 32 - 16;
}
}
break;
case 8:
for (int32 i = 0; i < count; i += inc_sa1, base += char_line_bytes, inc_sa1 = char_line_bytes, char_count = num_chars)
{
uint8 *line = base + (num_chars - char_count) * 8;
for (uint32 j = 0; j < char_count && p - buffer < count; j++, line += 8)
{
uint8 *q = line;
for (int32 l = 0; l < 8; l++, q += bytes_per_line)
{
for (int32 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;
}
p += 64 - 16;
}
}
break;
}
}
}
#ifdef DEBUGGER
if (Settings.TraceDMA)
{
sprintf(String, "DMA[%d]: %s Mode:%d 0x%02X%04X->0x21%02X Bytes:%d (%s) V:%03d",
Channel, d->ReverseTransfer ? "PPU->CPU" : "CPU->PPU", d->TransferMode, d->ABank, d->AAddress, d->BAddress,
d->TransferBytes, d->AAddressFixed ? "fixed" : (d->AAddressDecrement ? "dec" : "inc"), CPU.V_Counter);
if (d->BAddress == 0x18 || d->BAddress == 0x19 || d->BAddress == 0x39 || d->BAddress == 0x3a)
sprintf(String, "%s VRAM: %04X (%d,%d) %s", String,
PPU.VMA.Address, PPU.VMA.Increment, PPU.VMA.FullGraphicCount, PPU.VMA.High ? "word" : "byte");
else
if (d->BAddress == 0x22 || d->BAddress == 0x3b)
sprintf(String, "%s CGRAM: %02X (%x)", String, PPU.CGADD, PPU.CGFLIP);
else
if (d->BAddress == 0x04 || d->BAddress == 0x38)
sprintf(String, "%s OBJADDR: %04X", String, PPU.OAMAddr);
S9xMessage(S9X_TRACE, S9X_DMA_TRACE, String);
}
#endif
// Do Transfer
uint8 Work;
// 8 cycles per channel
ADD_CYCLES(SLOW_ONE_CYCLE);
if (!d->ReverseTransfer)
{
// CPU -> PPU
int32 b = 0;
uint16 p = d->AAddress;
uint8 *base = S9xGetBasePointer((d->ABank << 16) + d->AAddress);
bool8 inWRAM_DMA;
int32 rem = count;
// Transfer per block if d->AAdressFixed is FALSE
count = d->AAddressFixed ? rem : (d->AAddressDecrement ? ((p & MEMMAP_MASK) + 1) : (MEMMAP_BLOCK_SIZE - (p & MEMMAP_MASK)));
// Settings for custom chip DMA
if (in_sa1_dma)
{
base = &Memory.ROM[CMemory::MAX_ROM_SIZE - 0x10000];
p = 0;
count = rem;
}
else
if (in_sdd1_dma)
{
base = in_sdd1_dma;
p = 0;
count = rem;
}
else
if (spc7110_dma)
{
base = spc7110_dma;
p = 0;
count = rem;
}
inWRAM_DMA = ((!in_sa1_dma && !in_sdd1_dma && !spc7110_dma) &&
(d->ABank == 0x7e || d->ABank == 0x7f || (!(d->ABank & 0x40) && d->AAddress < 0x2000)));
// 8 cycles per byte
#define UPDATE_COUNTERS \
d->TransferBytes--; \
d->AAddress += inc; \
p += inc; \
if (!addCyclesInDMA(Channel)) \
{ \
CPU.InDMA = FALSE; \
CPU.InDMAorHDMA = FALSE; \
CPU.InWRAMDMAorHDMA = FALSE; \
CPU.CurrentDMAorHDMAChannel = -1; \
return (FALSE); \
}
while (1)
{
if (count > rem)
count = rem;
rem -= count;
CPU.InWRAMDMAorHDMA = inWRAM_DMA;
if (!base)
{
// DMA SLOW PATH
if (d->TransferMode == 0 || d->TransferMode == 2 || d->TransferMode == 6)
{
do
{
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
} while (--count > 0);
}
else
if (d->TransferMode == 1 || d->TransferMode == 5)
{
// This is a variation on Duff's Device. It is legal C/C++.
switch (b)
{
default:
while (count > 1)
{
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
count--;
// Fall through
case 1:
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2101 + d->BAddress);
UPDATE_COUNTERS;
count--;
}
}
if (count == 1)
{
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
b = 1;
}
else
b = 0;
}
else
if (d->TransferMode == 3 || d->TransferMode == 7)
{
switch (b)
{
default:
do
{
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 1;
break;
}
// Fall through
case 1:
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 2;
break;
}
// Fall through
case 2:
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2101 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 3;
break;
}
// Fall through
case 3:
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2101 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 0;
break;
}
} while (1);
}
}
else
if (d->TransferMode == 4)
{
switch (b)
{
default:
do
{
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 1;
break;
}
// Fall through
case 1:
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2101 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 2;
break;
}
// Fall through
case 2:
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2102 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 3;
break;
}
// Fall through
case 3:
Work = S9xGetByte((d->ABank << 16) + p);
S9xSetPPU(Work, 0x2103 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 0;
break;
}
} while (1);
}
}
#ifdef DEBUGGER
else
{
sprintf(String, "Unknown DMA transfer mode: %d on channel %d\n", d->TransferMode, Channel);
S9xMessage(S9X_TRACE, S9X_DMA_TRACE, String);
}
#endif
}
else
{
// DMA FAST PATH
if (d->TransferMode == 0 || d->TransferMode == 2 || d->TransferMode == 6)
{
switch (d->BAddress)
{
case 0x04: // OAMDATA
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2104(Work);
UPDATE_COUNTERS;
} while (--count > 0);
break;
case 0x18: // VMDATAL
if (!PPU.VMA.FullGraphicCount)
{
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2118_linear(Work);
UPDATE_COUNTERS;
} while (--count > 0);
}
else
{
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2118_tile(Work);
UPDATE_COUNTERS;
} while (--count > 0);
}
break;
case 0x19: // VMDATAH
if (!PPU.VMA.FullGraphicCount)
{
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2119_linear(Work);
UPDATE_COUNTERS;
} while (--count > 0);
}
else
{
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2119_tile(Work);
UPDATE_COUNTERS;
} while (--count > 0);
}
break;
case 0x22: // CGDATA
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2122(Work);
UPDATE_COUNTERS;
} while (--count > 0);
break;
case 0x80: // WMDATA
if (!CPU.InWRAMDMAorHDMA)
{
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2180(Work);
UPDATE_COUNTERS;
} while (--count > 0);
}
else
{
do
{
UPDATE_COUNTERS;
} while (--count > 0);
}
break;
default:
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
} while (--count > 0);
break;
}
}
else
if (d->TransferMode == 1 || d->TransferMode == 5)
{
if (d->BAddress == 0x18)
{
// VMDATAL
if (!PPU.VMA.FullGraphicCount)
{
switch (b)
{
default:
while (count > 1)
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2118_linear(Work);
UPDATE_COUNTERS;
count--;
// Fall through
case 1:
OpenBus = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, OpenBus, LUAMEMHOOK_READ);
#endif
REGISTER_2119_linear(OpenBus);
UPDATE_COUNTERS;
count--;
}
}
if (count == 1)
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2118_linear(Work);
UPDATE_COUNTERS;
b = 1;
}
else
b = 0;
}
else
{
switch (b)
{
default:
while (count > 1)
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2118_tile(Work);
UPDATE_COUNTERS;
count--;
// Fall through
case 1:
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2119_tile(Work);
UPDATE_COUNTERS;
count--;
}
}
if (count == 1)
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
REGISTER_2118_tile(Work);
UPDATE_COUNTERS;
b = 1;
}
else
b = 0;
}
}
else
{
// DMA mode 1 general case
switch (b)
{
default:
while (count > 1)
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
count--;
// Fall through
case 1:
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2101 + d->BAddress);
UPDATE_COUNTERS;
count--;
}
}
if (count == 1)
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
b = 1;
}
else
b = 0;
}
}
else
if (d->TransferMode == 3 || d->TransferMode == 7)
{
switch (b)
{
default:
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 1;
break;
}
// Fall through
case 1:
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 2;
break;
}
// Fall through
case 2:
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2101 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 3;
break;
}
// Fall through
case 3:
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2101 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 0;
break;
}
} while (1);
}
}
else
if (d->TransferMode == 4)
{
switch (b)
{
default:
do
{
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2100 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 1;
break;
}
// Fall through
case 1:
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2101 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 2;
break;
}
// Fall through
case 2:
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2102 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 3;
break;
}
// Fall through
case 3:
Work = *(base + p);
#ifdef HAVE_LUA
CallRegisteredLuaMemHook((d->ABank << 16) + d->AAddress, 1, Work, LUAMEMHOOK_READ);
#endif
S9xSetPPU(Work, 0x2103 + d->BAddress);
UPDATE_COUNTERS;
if (--count <= 0)
{
b = 0;
break;
}
} while (1);
}
}
#ifdef DEBUGGER
else
{
sprintf(String, "Unknown DMA transfer mode: %d on channel %d\n", d->TransferMode, Channel);
S9xMessage(S9X_TRACE, S9X_DMA_TRACE, String);
}
#endif
}
if (rem <= 0)
break;
base = S9xGetBasePointer((d->ABank << 16) + d->AAddress);
count = MEMMAP_BLOCK_SIZE;
inWRAM_DMA = ((!in_sa1_dma && !in_sdd1_dma && !spc7110_dma) &&
(d->ABank == 0x7e || d->ABank == 0x7f || (!(d->ABank & 0x40) && d->AAddress < 0x2000)));
}
#undef UPDATE_COUNTERS
}
else
{
// PPU -> CPU
// 8 cycles per byte
#define UPDATE_COUNTERS \
d->TransferBytes--; \
d->AAddress += inc; \
if (!addCyclesInDMA(Channel)) \
{ \
CPU.InDMA = FALSE; \
CPU.InDMAorHDMA = FALSE; \
CPU.InWRAMDMAorHDMA = FALSE; \
CPU.CurrentDMAorHDMAChannel = -1; \
return (FALSE); \
}
if (d->BAddress > 0x80 - 4 && d->BAddress <= 0x83 && !(d->ABank & 0x40))
{
// REVERSE-DMA REALLY-SLOW PATH
do
{
switch (d->TransferMode)
{
case 0:
case 2:
case 6:
CPU.InWRAMDMAorHDMA = (d->AAddress < 0x2000);
Work = S9xGetPPU(0x2100 + d->BAddress);
S9xSetByte(Work, (d->ABank << 16) + d->AAddress);
UPDATE_COUNTERS;
count--;
break;
case 1:
case 5:
CPU.InWRAMDMAorHDMA = (d->AAddress < 0x2000);
Work = S9xGetPPU(0x2100 + d->BAddress);
S9xSetByte(Work, (d->ABank << 16) + d->AAddress);
UPDATE_COUNTERS;
if (!--count)
break;
CPU.InWRAMDMAorHDMA = (d->AAddress < 0x2000);
Work = S9xGetPPU(0x2101 + d->BAddress);
S9xSetByte(Work, (d->ABank << 16) + d->AAddress);
UPDATE_COUNTERS;
count--;
break;