diff options
Diffstat (limited to 'src/dma.c')
| -rw-r--r-- | src/dma.c | 875 |
1 files changed, 875 insertions, 0 deletions
diff --git a/src/dma.c b/src/dma.c new file mode 100644 index 0000000..7e6e941 --- /dev/null +++ b/src/dma.c @@ -0,0 +1,875 @@ +/*
+ * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
+ *
+ * (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
+ * Jerremy Koot (jkoot@snes9x.com)
+ *
+ * Super FX C emulator code
+ * (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
+ * Gary Henderson.
+ * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
+ *
+ * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
+ * C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
+ * C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
+ *
+ * DOS port code contains the works of other authors. See headers in
+ * individual files.
+ *
+ * Snes9x homepage: http://www.snes9x.com
+ *
+ * Permission to use, copy, modify and distribute Snes9x in both binary and
+ * source form, for non-commercial purposes, is hereby granted without fee,
+ * providing that this license information and copyright notice appear with
+ * all copies and any derived work.
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event shall the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Snes9x is freeware for PERSONAL USE only. Commercial users should
+ * seek permission of the copyright holders first. Commercial use includes
+ * charging money for Snes9x or software derived from Snes9x.
+ *
+ * The copyright holders request that bug fixes and improvements to the code
+ * should be forwarded to them so everyone can benefit from the modifications
+ * in future versions.
+ *
+ * Super NES and Super Nintendo Entertainment System are trademarks of
+ * Nintendo Co., Limited and its subsidiary companies.
+ */
+#include "snes9x.h"
+
+#include "memmap.h"
+#include "ppu.h"
+#include "cpuexec.h"
+#include "missing.h"
+#include "dma.h"
+#include "apu.h"
+#include "gfx.h"
+#ifdef USE_SA1
+#include "sa1.h"
+#endif
+
+//SDD1
+#include "sdd1emu.h"
+uint8 buffer[0x10000];
+//SDD1//
+
+extern int HDMA_ModeByteCounts [8];
+extern uint8 *HDMAMemPointers [8];
+extern uint8 *HDMABasePointers [8];
+
+static int S9xCompareSDD1IndexEntries (const void *p1, const void *p2)
+{
+ return (*(uint32 *) p1 - *(uint32 *) p2);
+}
+
+/**********************************************************************************************/
+/* S9xDoDMA() */
+/* This function preforms the general dma transfer */
+/**********************************************************************************************/
+void S9xDoDMA (uint8 Channel)
+{
+ uint8 Work;
+
+ if (Channel > 7 || CPU.InDMA)
+ return;
+
+ CPU.InDMA = TRUE;
+ bool8 in_sa1_dma = FALSE;
+ uint8 *in_sdd1_dma = NULL;
+ SDMA *d = &DMA[Channel];
+
+ int count = d->TransferBytes;
+
+ if (count == 0)
+ count = 0x10000;
+
+ int inc = d->AAddressFixed ? 0 : (!d->AAddressDecrement ? 1 : -1);
+
+ if((d->ABank==0x7E||d->ABank==0x7F)&&d->BAddress==0x80)
+ {
+ d->AAddress+= d->TransferBytes;
+ goto update_address;
+ }
+ switch (d->BAddress)
+ {
+ case 0x18:
+ case 0x19:
+ if (IPPU.RenderThisFrame)
+#ifdef __DEBUG__
+ printf("FLUSH_REDRAW by DMA BAddress %x", d->BAddress);
+#endif
+ FLUSH_REDRAW ();
+
+ break;
+ }
+
+ if (Settings.SDD1)
+ {
+ if (d->AAddressFixed && Memory.FillRAM [0x4801] > 0)
+ {
+ // Hacky support for pre-decompressed S-DD1 data
+ inc = !d->AAddressDecrement ? 1 : -1;
+ uint32 address = (((d->ABank << 16) | d->AAddress) & 0xfffff) << 4;
+
+ address |= Memory.FillRAM [0x4804 + ((d->ABank - 0xc0) >> 4)];
+ if(Settings.SDD1Pack)
+ {
+ uint8* in_ptr=GetBasePointer(((d->ABank << 16) | d->AAddress));
+ in_ptr+=d->AAddress;
+
+ SDD1_decompress(buffer,in_ptr,d->TransferBytes);
+ in_sdd1_dma=buffer;
+ }
+ else
+ {
+ #if 1
+ void *ptr = bsearch (&address, Memory.SDD1Index,
+ Memory.SDD1Entries, 12, S9xCompareSDD1IndexEntries);
+ if (ptr)
+ in_sdd1_dma = *(uint32 *) ((uint8 *) ptr + 4) + Memory.SDD1Data;
+ #else
+ uint8 *ptr = Memory.SDD1Index;
+
+ for (uint32 e = 0; e < Memory.SDD1Entries; e++, ptr += 12)
+ {
+ if (address == *(uint32 *) ptr)
+ {
+ in_sdd1_dma = *(uint32 *) (ptr + 4) + Memory.SDD1Data;
+ break;
+ }
+ }
+ #endif
+
+/* if (!in_sdd1_dma)
+ {
+ // No matching decompressed data found. Must be some new
+ // graphics not encountered before. Log it if it hasn't been
+ // already.
+ uint8 *p = Memory.SDD1LoggedData;
+ bool8 found = FALSE;
+ uint8 SDD1Bank = Memory.FillRAM [0x4804 + ((d->ABank - 0xc0) >> 4)] | 0xf0;
+
+ for (uint32 i = 0; i < Memory.SDD1LoggedDataCount; i++, p += 8)
+ {
+ if (*p == d->ABank ||
+ *(p + 1) == (d->AAddress >> 8) &&
+ *(p + 2) == (d->AAddress & 0xff) &&
+ *(p + 3) == (count >> 8) &&
+ *(p + 4) == (count & 0xff) &&
+ *(p + 7) == SDD1Bank)
+ {
+ found = TRUE;
+ break;
+ }
+ }
+ if (!found && Memory.SDD1LoggedDataCount < MEMMAP_MAX_SDD1_LOGGED_ENTRIES)
+ {
+ *p = d->ABank;
+ *(p + 1) = d->AAddress >> 8;
+ *(p + 2) = d->AAddress & 0xff;
+ *(p + 3) = count >> 8;
+ *(p + 4) = count & 0xff;
+ *(p + 7) = SDD1Bank;
+ Memory.SDD1LoggedDataCount += 1;
+ }
+ }
+*/ }
+ }
+
+ Memory.FillRAM [0x4801] = 0;
+ }
+
+#ifdef USE_SA1
+ if (d->BAddress == 0x18 && SA1.in_char_dma && (d->ABank & 0xf0) == 0x40)
+#else
+ if (d->BAddress == 0x18 && (d->ABank & 0xf0) == 0x40)
+#endif
+ {
+ // Perform packed bitmap to PPU character format conversion on the
+ // data before transmitting it to V-RAM via-DMA.
+ int num_chars = 1 << ((Memory.FillRAM [0x2231] >> 2) & 7);
+ int depth = (Memory.FillRAM [0x2231] & 3) == 0 ? 8 :
+ (Memory.FillRAM [0x2231] & 3) == 1 ? 4 : 2;
+
+ int bytes_per_char = 8 * depth;
+ int bytes_per_line = depth * num_chars;
+ int char_line_bytes = bytes_per_char * num_chars;
+ uint32 addr = (d->AAddress / char_line_bytes) * char_line_bytes;
+ uint8 *base = GetBasePointer ((d->ABank << 16) + addr) + addr;
+ uint8 *buffer = &Memory.ROM [MAX_ROM_SIZE - 0x10000];
+ uint8 *p = buffer;
+ uint32 inc = char_line_bytes - (d->AAddress % char_line_bytes);
+ uint32 char_count = inc / bytes_per_char;
+
+ in_sa1_dma = TRUE;
+
+//printf ("%08x,", base); fflush (stdout);
+//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);
+ int i;
+
+ switch (depth)
+ {
+ case 2:
+ for (i = 0; i < count; i += inc, base += char_line_bytes,
+ inc = 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 (int l = 0; l < 8; l++, q += bytes_per_line)
+ {
+ for (int 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 (i = 0; i < count; i += inc, base += char_line_bytes,
+ inc = 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;
+ int l;
+ for (l = 0; l < 8; l++, q += bytes_per_line)
+ {
+ int b;
+ for (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 (i = 0; i < count; i += inc, base += char_line_bytes,
+ inc = 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 (int l = 0; l < 8; l++, q += bytes_per_line)
+ {
+ 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;
+ }
+ p += 64 - 16;
+ }
+ }
+ break;
+ }
+
+ }
+
+ if (!d->TransferDirection)
+ {
+#ifdef VAR_CYCLES
+ //reflects extra cycle used by DMA
+ CPU.Cycles += 8 * (count+1);
+#else
+ //needs fixing for the extra DMA cycle
+ CPU.Cycles += (1+count) + ((1+count) >> 2);
+#endif
+ uint8 *base = GetBasePointer ((d->ABank << 16) + d->AAddress);
+ uint16 p = d->AAddress;
+
+ if (!base)
+ base = Memory.ROM;
+
+ if (in_sa1_dma)
+ {
+ base = &Memory.ROM [MAX_ROM_SIZE - 0x10000];
+ p = 0;
+ }
+
+ if (in_sdd1_dma)
+ {
+ base = in_sdd1_dma;
+ p = 0;
+ }
+
+ if (inc > 0)
+ d->AAddress += count;
+ else
+ if (inc < 0)
+ d->AAddress -= count;
+
+ if (d->TransferMode == 0 || d->TransferMode == 2)
+ {
+ switch (d->BAddress)
+ {
+ case 0x04:
+ do
+ {
+ Work = *(base + p);
+ REGISTER_2104(Work);
+ p += inc;
+ CHECK_SOUND();
+ } while (--count > 0);
+ break;
+ case 0x18:
+ IPPU.FirstVRAMRead = TRUE;
+ if (!PPU.VMA.FullGraphicCount)
+ {
+ do
+ {
+ Work = *(base + p);
+ REGISTER_2118_linear(Work);
+ p += inc;
+ CHECK_SOUND();
+ } while (--count > 0);
+ }
+ else
+ {
+ do
+ {
+ Work = *(base + p);
+ REGISTER_2118_tile(Work);
+ p += inc;
+ CHECK_SOUND();
+ } while (--count > 0);
+ }
+ break;
+ case 0x19:
+ IPPU.FirstVRAMRead = TRUE;
+ if (!PPU.VMA.FullGraphicCount)
+ {
+ do
+ {
+ Work = *(base + p);
+ REGISTER_2119_linear(Work);
+ p += inc;
+ CHECK_SOUND();
+ } while (--count > 0);
+ }
+ else
+ {
+ do
+ {
+ Work = *(base + p);
+ REGISTER_2119_tile(Work);
+ p += inc;
+ CHECK_SOUND();
+ } while (--count > 0);
+ }
+ break;
+ case 0x22:
+ do
+ {
+ Work = *(base + p);
+ REGISTER_2122(Work);
+ p += inc;
+ CHECK_SOUND();
+ } while (--count > 0);
+ break;
+ case 0x80:
+ do
+ {
+ Work = *(base + p);
+ REGISTER_2180(Work);
+ p += inc;
+ CHECK_SOUND();
+ } while (--count > 0);
+ break;
+ default:
+ do
+ {
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2100 + d->BAddress);
+ p += inc;
+ CHECK_SOUND();
+ } while (--count > 0);
+ break;
+ }
+ }
+ else
+ if (d->TransferMode == 1 || d->TransferMode == 5)
+ {
+ if (d->BAddress == 0x18)
+ {
+ // Write to V-RAM
+ IPPU.FirstVRAMRead = TRUE;
+ if (!PPU.VMA.FullGraphicCount)
+ {
+ while (count > 1)
+ {
+ Work = *(base + p);
+ REGISTER_2118_linear(Work);
+ p += inc;
+
+ Work = *(base + p);
+ REGISTER_2119_linear(Work);
+ p += inc;
+ CHECK_SOUND();
+ count -= 2;
+ }
+ if (count == 1)
+ {
+ Work = *(base + p);
+ REGISTER_2118_linear(Work);
+ p += inc;
+ }
+ }
+ else
+ {
+ while (count > 1)
+ {
+ Work = *(base + p);
+ REGISTER_2118_tile(Work);
+ p += inc;
+
+ Work = *(base + p);
+ REGISTER_2119_tile(Work);
+ p += inc;
+ CHECK_SOUND();
+ count -= 2;
+ }
+ if (count == 1)
+ {
+ Work = *(base + p);
+ REGISTER_2118_tile(Work);
+ p += inc;
+ }
+ }
+ }
+ else
+ {
+ // DMA mode 1 general case
+ while (count > 1)
+ {
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2100 + d->BAddress);
+ p += inc;
+
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2101 + d->BAddress);
+ p += inc;
+ CHECK_SOUND();
+ count -= 2;
+ }
+ if (count == 1)
+ {
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2100 + d->BAddress);
+ p += inc;
+ }
+ }
+ }
+ else
+ if (d->TransferMode == 3)
+ {
+ do
+ {
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2100 + d->BAddress);
+ p += inc;
+ if (count <= 1)
+ break;
+
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2100 + d->BAddress);
+ p += inc;
+ if (count <= 2)
+ break;
+
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2101 + d->BAddress);
+ p += inc;
+ if (count <= 3)
+ break;
+
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2101 + d->BAddress);
+ p += inc;
+ CHECK_SOUND();
+ count -= 4;
+ } while (count > 0);
+ }
+ else
+ if (d->TransferMode == 4)
+ {
+ do
+ {
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2100 + d->BAddress);
+ p += inc;
+ if (count <= 1)
+ break;
+
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2101 + d->BAddress);
+ p += inc;
+ if (count <= 2)
+ break;
+
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2102 + d->BAddress);
+ p += inc;
+ if (count <= 3)
+ break;
+
+ Work = *(base + p);
+ S9xSetPPU (Work, 0x2103 + d->BAddress);
+ p += inc;
+ CHECK_SOUND();
+ count -= 4;
+ } while (count > 0);
+ }
+ }
+ else
+ {
+ do
+ {
+ switch (d->TransferMode)
+ {
+ case 0:
+ case 2:
+#ifndef VAR_CYCLES
+ CPU.Cycles += 1;
+#endif
+ Work = S9xGetPPU (0x2100 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ --count;
+ break;
+
+ case 1:
+ case 5:
+#ifndef VAR_CYCLES
+ CPU.Cycles += 3;
+#endif
+ Work = S9xGetPPU (0x2100 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ if (!--count)
+ break;
+
+ Work = S9xGetPPU (0x2101 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ count--;
+ break;
+
+ case 3:
+#ifndef VAR_CYCLES
+ CPU.Cycles += 6;
+#endif
+ Work = S9xGetPPU (0x2100 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ if (!--count)
+ break;
+
+ Work = S9xGetPPU (0x2100 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ if (!--count)
+ break;
+
+ Work = S9xGetPPU (0x2101 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ if (!--count)
+ break;
+
+ Work = S9xGetPPU (0x2101 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ count--;
+ break;
+
+ case 4:
+#ifndef VAR_CYCLES
+ CPU.Cycles += 6;
+#endif
+ Work = S9xGetPPU (0x2100 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ if (!--count)
+ break;
+
+ Work = S9xGetPPU (0x2101 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ if (!--count)
+ break;
+
+ Work = S9xGetPPU (0x2102 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ if (!--count)
+ break;
+
+ Work = S9xGetPPU (0x2103 + d->BAddress);
+ S9xSetByte (Work, (d->ABank << 16) + d->AAddress);
+ d->AAddress += inc;
+ count--;
+ break;
+
+ default:
+ count = 0;
+ break;
+ }
+ CHECK_SOUND();
+ } while (count);
+ }
+
+//#ifdef SPC700_C
+#ifdef SPC700_SHUTDOWN
+ CPU.APU_APUExecuting = Settings.APUEnabled;
+#endif
+ asm_APU_EXECUTE(1); // execute but only in normal mode
+//#endif
+ while (CPU.Cycles > CPU.NextEvent)
+ S9xDoHBlankProcessing ();
+
+update_address:
+ // Super Punch-Out requires that the A-BUS address be updated after the
+ // DMA transfer.
+ Memory.FillRAM[0x4302 + (Channel << 4)] = (uint8) d->AAddress;
+ Memory.FillRAM[0x4303 + (Channel << 4)] = d->AAddress >> 8;
+
+ // Secret of the Mana requires that the DMA bytes transfer count be set to
+ // zero when DMA has completed.
+ Memory.FillRAM [0x4305 + (Channel << 4)] = 0;
+ Memory.FillRAM [0x4306 + (Channel << 4)] = 0;
+
+ DMA[Channel].IndirectAddress = 0;
+ d->TransferBytes = 0;
+
+ CPU.InDMA = FALSE;
+}
+
+void S9xStartHDMA ()
+{
+ //if (Settings.DisableHDMA)
+ //IPPU.HDMA = 0;
+ //else
+ missing.hdma_this_frame = IPPU.HDMA = Memory.FillRAM [0x420c];
+
+ IPPU.HDMAStarted = TRUE;
+
+ for (uint8 i = 0; i < 8; i++)
+ {
+ if (IPPU.HDMA & (1 << i))
+ {
+ DMA [i].LineCount = 0;
+ DMA [i].FirstLine = TRUE;
+ DMA [i].Address = DMA [i].AAddress;
+ }
+ HDMAMemPointers [i] = NULL;
+ }
+}
+
+uint8 S9xDoHDMA (uint8 byte)
+{
+ SDMA *p = &DMA [0];
+
+ int d = 0;
+
+ for (uint8 mask = 1; mask; mask <<= 1, p++, d++)
+ {
+ if (byte & mask)
+ {
+ if (!p->LineCount)
+ {
+ uint8 line = S9xGetByte ((p->ABank << 16) + p->Address);
+ if (line == 0x80)
+ {
+ p->Repeat = TRUE;
+ p->LineCount = 128;
+ }
+ else
+ {
+ p->Repeat = !(line & 0x80);
+ p->LineCount = line & 0x7f;
+ }
+
+ // Disable H-DMA'ing into V-RAM (register 2118) for Hook
+ if (!p->LineCount || p->BAddress == 0x18)
+ {
+ byte &= ~mask;
+ p->IndirectAddress += HDMAMemPointers [d] - HDMABasePointers [d];
+ Memory.FillRAM [0x4305 + (d << 4)] = (uint8) p->IndirectAddress;
+ Memory.FillRAM [0x4306 + (d << 4)] = p->IndirectAddress >> 8;
+ continue;
+ }
+
+ p->Address++;
+ p->FirstLine = 1;
+ if (p->HDMAIndirectAddressing)
+ {
+ p->IndirectBank = Memory.FillRAM [0x4307 + (d << 4)];
+ p->IndirectAddress = S9xGetWord ((p->ABank << 16) + p->Address);
+ p->Address += 2;
+ }
+ else
+ {
+ p->IndirectBank = p->ABank;
+ p->IndirectAddress = p->Address;
+ }
+ HDMABasePointers [d] = HDMAMemPointers [d] =
+ S9xGetMemPointer ((p->IndirectBank << 16) + p->IndirectAddress);
+ }
+ else
+ {
+
+ if (!HDMAMemPointers [d])
+ {
+ if (!p->HDMAIndirectAddressing)
+ {
+ p->IndirectBank = p->ABank;
+ p->IndirectAddress = p->Address;
+ }
+
+ if (!(HDMABasePointers [d] = HDMAMemPointers [d] =
+ S9xGetMemPointer ((p->IndirectBank << 16) + p->IndirectAddress)))
+ {
+ byte &= ~mask;
+ continue;
+ }
+ // Uncommenting the following line breaks Punchout - it starts
+ // H-DMA during the frame.
+ //p->FirstLine = TRUE;
+ }
+ }
+ if (p->Repeat && !p->FirstLine)
+ {
+ p->LineCount--;
+ continue;
+ }
+ switch (p->TransferMode)
+ {
+ case 0:
+#ifndef VAR_CYCLES
+ CPU.Cycles += 1;
+#else
+ CPU.Cycles += 8;
+#endif
+ S9xSetPPU (*HDMAMemPointers [d]++, 0x2100 + p->BAddress);
+ break;
+ case 1:
+ case 5:
+#ifndef VAR_CYCLES
+ CPU.Cycles += 3;
+#else
+ CPU.Cycles += 16;
+#endif
+ S9xSetPPU (*(HDMAMemPointers [d] + 0), 0x2100 + p->BAddress);
+ S9xSetPPU (*(HDMAMemPointers [d] + 1), 0x2101 + p->BAddress);
+ HDMAMemPointers [d] += 2;
+ break;
+ case 2:
+ case 6:
+#ifndef VAR_CYCLES
+ CPU.Cycles += 3;
+#else
+ CPU.Cycles += 16;
+#endif
+ S9xSetPPU (*(HDMAMemPointers [d] + 0), 0x2100 + p->BAddress);
+ S9xSetPPU (*(HDMAMemPointers [d] + 1), 0x2100 + p->BAddress);
+ HDMAMemPointers [d] += 2;
+ break;
+ case 3:
+ case 7:
+#ifndef VAR_CYCLES
+ CPU.Cycles += 6;
+#else
+ CPU.Cycles += 32;
+#endif
+ S9xSetPPU (*(HDMAMemPointers [d] + 0), 0x2100 + p->BAddress);
+ S9xSetPPU (*(HDMAMemPointers [d] + 1), 0x2100 + p->BAddress);
+ S9xSetPPU (*(HDMAMemPointers [d] + 2), 0x2101 + p->BAddress);
+ S9xSetPPU (*(HDMAMemPointers [d] + 3), 0x2101 + p->BAddress);
+ HDMAMemPointers [d] += 4;
+ break;
+ case 4:
+#ifndef VAR_CYCLES
+ CPU.Cycles += 6;
+#else
+ CPU.Cycles += 32;
+#endif
+ S9xSetPPU (*(HDMAMemPointers [d] + 0), 0x2100 + p->BAddress);
+ S9xSetPPU (*(HDMAMemPointers [d] + 1), 0x2101 + p->BAddress);
+ S9xSetPPU (*(HDMAMemPointers [d] + 2), 0x2102 + p->BAddress);
+ S9xSetPPU (*(HDMAMemPointers [d] + 3), 0x2103 + p->BAddress);
+ HDMAMemPointers [d] += 4;
+ break;
+ }
+ if (!p->HDMAIndirectAddressing)
+ p->Address += HDMA_ModeByteCounts [p->TransferMode];
+ p->FirstLine = FALSE;
+ p->LineCount--;
+ }
+ }
+ return (byte);
+}
+
+void S9xResetDMA ()
+{
+ int d;
+ for (d = 0; d < 8; d++)
+ {
+ DMA [d].TransferDirection = FALSE;
+ DMA [d].HDMAIndirectAddressing = FALSE;
+ DMA [d].AAddressFixed = TRUE;
+ DMA [d].AAddressDecrement = FALSE;
+ DMA [d].TransferMode = 0xff;
+ DMA [d].ABank = 0xff;
+ DMA [d].AAddress = 0xffff;
+ DMA [d].Address = 0xffff;
+ DMA [d].BAddress = 0xff;
+ DMA [d].TransferBytes = 0xffff;
+ }
+ for (int c = 0x4300; c < 0x4380; c += 0x10)
+ {
+ for (d = c; d < c + 12; d++)
+ Memory.FillRAM [d] = 0xff;
+
+ Memory.FillRAM [c + 0xf] = 0xff;
+ }
+}
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