/*******************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.

  (c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
                            Jerremy Koot (jkoot@snes9x.com)

  (c) Copyright 2001 - 2004 John Weidman (jweidman@slip.net)

  (c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
                            funkyass (funkyass@spam.shaw.ca),
                            Joel Yliluoma (http://iki.fi/bisqwit/)
                            Kris Bleakley (codeviolation@hotmail.com),
                            Matthew Kendora,
                            Nach (n-a-c-h@users.sourceforge.net),
                            Peter Bortas (peter@bortas.org) and
                            zones (kasumitokoduck@yahoo.com)

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
                            _Demo_ (_demo_@zsnes.com), and Nach

  C4 C++ code
  (c) Copyright 2003 Brad Jorsch

  DSP-1 emulator code
  (c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
                            John Weidman, neviksti (neviksti@hotmail.com),
                            Kris Bleakley, Andreas Naive

  DSP-2 emulator code
  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
                     Lord Nightmare (lord_nightmare@users.sourceforge.net

  OBC1 emulator code
  (c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
                            Kris Bleakley
  Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code
  (c) Copyright 2002 Matthew Kendora with research by
                     zsKnight, John Weidman, and Dark Force

  S-DD1 C emulator code
  (c) Copyright 2003 Brad Jorsch with research by
                     Andreas Naive and John Weidman

  S-RTC C emulator code
  (c) Copyright 2001 John Weidman

  ST010 C++ emulator code
  (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora

  Super FX x86 assembler emulator code
  (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault

  Super FX C emulator code
  (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman


  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)


  Specific ports 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.
*******************************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "snes9x.h"

#include "memmap.h"
#include "ppu.h"
#include "cpuexec.h"
#include "missing.h"
#include "dma.h"
#include "apu.h"
#include "gfx.h"
#include "sa1.h"
#include "spc7110.h"

#ifdef SDD1_DECOMP
#include "sdd1emu.h"
#endif

#ifdef SDD1_DECOMP
uint8 buffer[0x10000];
#endif

extern int HDMA_ModeByteCounts [8];
extern uint8* HDMAMemPointers [8];
extern uint8* HDMABasePointers [8];

// #define SETA010_HDMA_FROM_CART

#ifdef SETA010_HDMA_FROM_CART
uint32 HDMARawPointers[8]; // Cart address space pointer
#endif

#if defined(__linux__) || defined(__WIN32__)
static int S9xCompareSDD1IndexEntries(const void* p1, const void* p2)
{
   return (*(uint32*) p1 - * (uint32*) p2);
}
#endif

/**********************************************************************************************/
/* 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;
   uint8* spc7110_dma = NULL;
   bool s7_wrap = false;
   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;
      //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
      CPU.Cycles += (d->TransferBytes + 1) * SLOW_ONE_CYCLE;
      goto update_address;
   }
   switch (d->BAddress)
   {
   case 0x18:
   case 0x19:
      if (IPPU.RenderThisFrame)
         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)];

#ifdef SDD1_DECOMP
         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;
#ifdef SDD1_VERIFY
            void* ptr = bsearch(&address, Memory.SDD1Index,
                                Memory.SDD1Entries, 12, S9xCompareSDD1IndexEntries);
            if (memcmp(buffer, ptr, d->TransferBytes))
            {
               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;
               }
               if (!found && Memory.SDD1LoggedDataCount < MEMMAP_MAX_SDD1_LOGGED_ENTRIES)
               {
                  int j = 0;
                  while (ptr[j] == buffer[j])
                     j++;

                  *p = d->ABank;
                  *(p + 1) = d->AAddress >> 8;
                  *(p + 2) = d->AAddress & 0xff;
                  *(p + 3) = j & 0xFF;
                  *(p + 4) = (j >> 8) & 0xFF;
                  *(p + 7) = SDD1Bank;
                  Memory.SDD1LoggedDataCount += 1;
               }
            }
#endif
         }

         else
         {
#endif
#if defined(__linux__) || defined (__WIN32__)
            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;

            uint32 e;
            for (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;

               uint32 i;
               for (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;
               }
            }
         }
#ifdef SDD1_DECOMP
      }
#endif

      Memory.FillRAM [0x4801] = 0;
   }
   if (Settings.SPC7110 && (d->AAddress == 0x4800 || d->ABank == 0x50))
   {
      uint32 i, j;
      i = (s7r.reg4805 | (s7r.reg4806 << 8));
      i *= s7r.AlignBy;
      i += s7r.bank50Internal;
      i %= DECOMP_BUFFER_SIZE;
      j = 0;
      if ((i + d->TransferBytes) < DECOMP_BUFFER_SIZE)
         spc7110_dma = &s7r.bank50[i];
      else
      {
         spc7110_dma = (uint8*)malloc(d->TransferBytes);
         j = DECOMP_BUFFER_SIZE - i;
         memcpy(spc7110_dma, &s7r.bank50[i], j);
         memcpy(&spc7110_dma[j], s7r.bank50, d->TransferBytes - j);
         s7_wrap = true;
      }
      int icount = s7r.reg4809 | (s7r.reg480A << 8);
      icount -= d->TransferBytes;
      s7r.reg4809 = 0x00ff & icount;
      s7r.reg480A = (0xff00 & icount) >> 8;

      s7r.bank50Internal += d->TransferBytes;
      s7r.bank50Internal %= DECOMP_BUFFER_SIZE;
      inc = 1;
      d->AAddress -= count;
   }
   if (d->BAddress == 0x18 && SA1.in_char_dma && (d->ABank & 0xf0) == 0x40)
   {
      // 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)
         {
            uint32 j;
            uint8* line = base + (num_chars - char_count) * 2;
            for (j = 0; j < char_count && p - buffer < count;
                  j++, line += 2)
            {
               int b, l;
               uint8* q = line;
               for (l = 0; l < 8; l++, q += bytes_per_line)
               {
                  for (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)
         {
            uint32 j;
            uint8* line = base + (num_chars - char_count) * 4;
            for (j = 0; j < char_count && p - buffer < count;
                  j++, line += 4)
            {
               uint8* q = line;
               int b, l;
               for (l = 0; l < 8; l++, q += bytes_per_line)
               {
                  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;
            uint32 j;
            for (j = 0; j < char_count && p - buffer < count;
                  j++, line += 8)
            {
               uint8* q = line;
               int b, l;
               for (l = 0; l < 8; l++, q += bytes_per_line)
               {
                  for (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)
   {
      /* XXX: DMA is potentially broken here for cases where we DMA across
       * XXX: memmap boundries. A possible solution would be to re-call
       * XXX: GetBasePointer whenever we cross a boundry, and when
       * XXX: GetBasePointer returns (0) to take the 'slow path' and use
       * XXX: S9xGetByte instead of *base. GetBasePointer() would want to
       * XXX: return (0) for MAP_PPU and whatever else is a register range
       * XXX: rather than a RAM/ROM block, and we'd want to detect MAP_PPU
       * XXX: (or specifically, Address Bus B addresses $2100-$21FF in
       * XXX: banks $00-$3F) specially and treat it as MAP_NONE (since
       * XXX: PPU->PPU transfers don't work).
       */

      //reflects extra cycle used by DMA
      CPU.Cycles += SLOW_ONE_CYCLE * (count + 1);

      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 (spc7110_dma)
      {
         base = spc7110_dma;
         p = 0;
      }
      if (inc > 0)
         d->AAddress += count;
      else if (inc < 0)
         d->AAddress -= count;

      if (d->TransferMode == 0 || d->TransferMode == 2 || d->TransferMode == 6)
      {
         switch (d->BAddress)
         {
         case 0x04:
            do
            {
               Work = *(base + p);
               REGISTER_2104(Work);
               p += inc;
               CHECK_SOUND();
            }
            while (--count > 0);
            break;
         case 0x18:
#ifndef CORRECT_VRAM_READS
            IPPU.FirstVRAMRead = TRUE;
#endif
            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:
#ifndef CORRECT_VRAM_READS
            IPPU.FirstVRAMRead = TRUE;
#endif
            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
#ifndef CORRECT_VRAM_READS
            IPPU.FirstVRAMRead = TRUE;
#endif
            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 || d->TransferMode == 7)
      {
         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
   {
      /* XXX: DMA is potentially broken here for cases where the dest is
       * XXX: in the Address Bus B range. Note that this bad dest may not
       * XXX: cover the whole range of the DMA though, if we transfer
       * XXX: 65536 bytes only 256 of them may be Address Bus B.
       */
      do
      {
         switch (d->TransferMode)
         {
         case 0:
         case 2:
         case 6:
            Work = S9xGetPPU(0x2100 + d->BAddress);
            S9xSetByte(Work, (d->ABank << 16) + d->AAddress);
            d->AAddress += inc;
            --count;
            break;

         case 1:
         case 5:
            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:
         case 7:
            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:
            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
   IAPU.APUExecuting = Settings.APUEnabled;
   APU_EXECUTE();
#endif
   if (Settings.SuperFX)
      while (CPU.Cycles > CPU.NextEvent)
         S9xDoHBlankProcessing_SFX();
   else /* if (!Settings.SuperFX) */
      while (CPU.Cycles > CPU.NextEvent)
         S9xDoHBlankProcessing_NoSFX();

   if (Settings.SPC7110 && spc7110_dma)
   {
      if (spc7110_dma && s7_wrap)
         free(spc7110_dma);
   }

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];

   //per anomie timing post
   if (IPPU.HDMA != 0)
      CPU.Cycles += ONE_CYCLE * 3;

   IPPU.HDMAStarted = TRUE;

   uint8 i;
   for (i = 0; i < 8; i++)
   {
      if (IPPU.HDMA & (1 << i))
      {
         CPU.Cycles += SLOW_ONE_CYCLE ;
         DMA [i].LineCount = 0;
         DMA [i].FirstLine = TRUE;
         DMA [i].Address = DMA [i].AAddress;
         if (DMA[i].HDMAIndirectAddressing)
            CPU.Cycles += (SLOW_ONE_CYCLE << 2);
      }
      HDMAMemPointers [i] = NULL;
#ifdef SETA010_HDMA_FROM_CART
      HDMARawPointers [i] = 0;
#endif
   }
}

uint8 S9xDoHDMA(uint8 byte)
{
   SDMA* p = &DMA [0];

   int d = 0;

   CPU.InDMA = TRUE;
   CPU.Cycles += ONE_CYCLE * 3;
   uint8 mask;
   for (mask = 1; mask; mask <<= 1, p++, d++)
   {
      if (byte & mask)
      {
         if (!p->LineCount)
         {
            //remember, InDMA is set.
            //Get/Set incur no charges!
            CPU.Cycles += SLOW_ONE_CYCLE;
            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
            /* XXX: instead of p->BAddress == 0x18, make S9xSetPPU fail
             * XXX: writes to $2118/9 when appropriate
             */
#ifdef SETA010_HDMA_FROM_CART
            if (!p->LineCount)
#else
            if (!p->LineCount || p->BAddress == 0x18)
#endif
            {
               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)];
               //again, no cycle charges while InDMA is set!
               CPU.Cycles += SLOW_ONE_CYCLE << 2;
               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);
#ifdef SETA010_HDMA_FROM_CART
            HDMARawPointers [d] = (p->IndirectBank << 16) + p->IndirectAddress;
#endif
         }
         else
            CPU.Cycles += SLOW_ONE_CYCLE;

         if (!HDMAMemPointers [d])
         {
            if (!p->HDMAIndirectAddressing)
            {
               p->IndirectBank = p->ABank;
               p->IndirectAddress = p->Address;
            }
#ifdef SETA010_HDMA_FROM_CART
            HDMARawPointers [d] = (p->IndirectBank << 16) + p->IndirectAddress;
#endif
            if (!(HDMABasePointers [d] = HDMAMemPointers [d] =
                                            S9xGetMemPointer((p->IndirectBank << 16) + p->IndirectAddress)))
            {
               /* XXX: Instead of this, goto a slow path that first
                * XXX: verifies src!=Address Bus B, then uses
                * XXX: S9xGetByte(). Or make S9xGetByte return OpenBus
                * XXX: (probably?) for Address Bus B while inDMA.
                */
               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;
         }

         if (p->BAddress == 0x04)
         {
            if (SNESGameFixes.Uniracers)
            {
               PPU.OAMAddr = 0x10c;
               PPU.OAMFlip = 0;
            }
         }

         switch (p->TransferMode)
         {
         case 0:
            CPU.Cycles += SLOW_ONE_CYCLE;
#ifdef SETA010_HDMA_FROM_CART
            S9xSetPPU(S9xGetByte(HDMARawPointers [d]++), 0x2100 + p->BAddress);
            HDMAMemPointers [d]++;
#else
            S9xSetPPU(*HDMAMemPointers [d]++, 0x2100 + p->BAddress);
#endif
            break;
         case 5:
            CPU.Cycles += 2 * SLOW_ONE_CYCLE;
#ifdef SETA010_HDMA_FROM_CART
            S9xSetPPU(S9xGetByte(HDMARawPointers [d]), 0x2100 + p->BAddress);
            S9xSetPPU(S9xGetByte(HDMARawPointers [d] + 1), 0x2101 + p->BAddress);
            HDMARawPointers [d] += 2;
#else
            S9xSetPPU(*(HDMAMemPointers [d] + 0), 0x2100 + p->BAddress);
            S9xSetPPU(*(HDMAMemPointers [d] + 1), 0x2101 + p->BAddress);
#endif
            HDMAMemPointers [d] += 2;
         /* fall through */
         case 1:
            CPU.Cycles += 2 * SLOW_ONE_CYCLE;
#ifdef SETA010_HDMA_FROM_CART
            S9xSetPPU(S9xGetByte(HDMARawPointers [d]), 0x2100 + p->BAddress);
            S9xSetPPU(S9xGetByte(HDMARawPointers [d] + 1), 0x2101 + p->BAddress);
            HDMARawPointers [d] += 2;
#else
            S9xSetPPU(*(HDMAMemPointers [d] + 0), 0x2100 + p->BAddress);
            S9xSetPPU(*(HDMAMemPointers [d] + 1), 0x2101 + p->BAddress);
#endif
            HDMAMemPointers [d] += 2;
            break;
         case 2:
         case 6:
            CPU.Cycles += 2 * SLOW_ONE_CYCLE;
#ifdef SETA010_HDMA_FROM_CART
            S9xSetPPU(S9xGetByte(HDMARawPointers [d]), 0x2100 + p->BAddress);
            S9xSetPPU(S9xGetByte(HDMARawPointers [d] + 1), 0x2100 + p->BAddress);
            HDMARawPointers [d] += 2;
#else
            S9xSetPPU(*(HDMAMemPointers [d] + 0), 0x2100 + p->BAddress);
            S9xSetPPU(*(HDMAMemPointers [d] + 1), 0x2100 + p->BAddress);
#endif
            HDMAMemPointers [d] += 2;
            break;
         case 3:
         case 7:
            CPU.Cycles += 4 * SLOW_ONE_CYCLE;
#ifdef SETA010_HDMA_FROM_CART
            S9xSetPPU(S9xGetByte(HDMARawPointers [d]), 0x2100 + p->BAddress);
            S9xSetPPU(S9xGetByte(HDMARawPointers [d] + 1), 0x2100 + p->BAddress);
            S9xSetPPU(S9xGetByte(HDMARawPointers [d] + 2), 0x2101 + p->BAddress);
            S9xSetPPU(S9xGetByte(HDMARawPointers [d] + 3), 0x2101 + p->BAddress);
            HDMARawPointers [d] += 4;
#else
            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);
#endif
            HDMAMemPointers [d] += 4;
            break;
         case 4:
            CPU.Cycles += 4 * SLOW_ONE_CYCLE;
#ifdef SETA010_HDMA_FROM_CART
            S9xSetPPU(S9xGetByte(HDMARawPointers [d]), 0x2100 + p->BAddress);
            S9xSetPPU(S9xGetByte(HDMARawPointers [d] + 1), 0x2101 + p->BAddress);
            S9xSetPPU(S9xGetByte(HDMARawPointers [d] + 2), 0x2102 + p->BAddress);
            S9xSetPPU(S9xGetByte(HDMARawPointers [d] + 3), 0x2103 + p->BAddress);
            HDMARawPointers [d] += 4;
#else
            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);
#endif
            HDMAMemPointers [d] += 4;
            break;
         }
         if (!p->HDMAIndirectAddressing)
            p->Address += HDMA_ModeByteCounts [p->TransferMode];
         p->IndirectAddress += HDMA_ModeByteCounts [p->TransferMode];
         /* XXX: Check for p->IndirectAddress crossing a mapping boundry,
          * XXX: and invalidate HDMAMemPointers[d]
          */
         p->FirstLine = FALSE;
         p->LineCount--;
      }
   }
   CPU.InDMA = FALSE;
   return (byte);
}

void S9xResetDMA()
{
   int c, 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 (c = 0x4300; c < 0x4380; c += 0x10)
   {
      for (d = c; d < c + 12; d++)
         Memory.FillRAM [d] = 0xff;

      Memory.FillRAM [c + 0xf] = 0xff;
   }
}