libpcsxcore/psxdma.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
  18  ***************************************************************************/
  19
  20 /*
  21 * Handles PSX DMA functions.
  22 */
  23
  24 #include "psxdma.h"
  25 #include "gpu.h"
  26
  27 // Dma0/1 in Mdec.c
  28 // Dma3   in CdRom.c
  29
  30 void spuInterrupt() {
  31         if (HW_DMA4_CHCR & SWAP32(0x01000000))
  32         {
  33                 HW_DMA4_CHCR &= SWAP32(~0x01000000);
  34                 DMA_INTERRUPT(4);
  35         }
  36 }
  37
  38 void psxDma4(u32 madr, u32 bcr, u32 chcr) { // SPU
  39         u16 *ptr;
  40         u32 words;
  41
  42         switch (chcr) {
  43                 case 0x01000201: //cpu to spu transfer
  44 #ifdef PSXDMA_LOG
  45                         PSXDMA_LOG("*** DMA4 SPU - mem2spu *** %x addr = %x size = %x\n", chcr, madr, bcr);
  46 #endif
  47                         ptr = (u16 *)PSXM(madr);
  48                         if (ptr == NULL) {
  49 #ifdef CPU_LOG
  50                                 CPU_LOG("*** DMA4 SPU - mem2spu *** NULL Pointer!!!\n");
  51 #endif
  52                                 break;
  53                         }
  54                         words = (bcr >> 16) * (bcr & 0xffff);
  55                         SPU_writeDMAMem(ptr, words * 2, psxRegs.cycle);
  56                         HW_DMA4_MADR = SWAPu32(madr + words * 4);
  57                         SPUDMA_INT(words / 2);
  58                         return;
  59
  60                 case 0x01000200: //spu to cpu transfer
  61 #ifdef PSXDMA_LOG
  62                         PSXDMA_LOG("*** DMA4 SPU - spu2mem *** %x addr = %x size = %x\n", chcr, madr, bcr);
  63 #endif
  64                         ptr = (u16 *)PSXM(madr);
  65                         if (ptr == NULL) {
  66 #ifdef CPU_LOG
  67                                 CPU_LOG("*** DMA4 SPU - spu2mem *** NULL Pointer!!!\n");
  68 #endif
  69                                 break;
  70                         }
  71                         words = (bcr >> 16) * (bcr & 0xffff);
  72                         SPU_readDMAMem(ptr, words * 2, psxRegs.cycle);
  73                         psxCpu->Clear(madr, words);
  74
  75                         HW_DMA4_MADR = SWAPu32(madr + words * 4);
  76                         SPUDMA_INT(words / 2);
  77                         return;
  78
  79 #ifdef PSXDMA_LOG
  80                 default:
  81                         PSXDMA_LOG("*** DMA4 SPU - unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
  82                         break;
  83 #endif
  84         }
  85
  86         HW_DMA4_CHCR &= SWAP32(~0x01000000);
  87         DMA_INTERRUPT(4);
  88 }
  89
  90 // Taken from PEOPS SOFTGPU
  91 static inline boolean CheckForEndlessLoop(u32 laddr, u32 *lUsedAddr) {
  92         if (laddr == lUsedAddr[1]) return TRUE;
  93         if (laddr == lUsedAddr[2]) return TRUE;
  94
  95         if (laddr < lUsedAddr[0]) lUsedAddr[1] = laddr;
  96         else lUsedAddr[2] = laddr;
  97
  98         lUsedAddr[0] = laddr;
  99
 100         return FALSE;
 101 }
 102
 103 static u32 gpuDmaChainSize(u32 addr) {
 104         u32 size;
 105         u32 DMACommandCounter = 0;
 106         u32 lUsedAddr[3];
 107
 108         lUsedAddr[0] = lUsedAddr[1] = lUsedAddr[2] = 0xffffff;
 109
 110         // initial linked list ptr (word)
 111         size = 1;
 112
 113         do {
 114                 addr &= 0x1ffffc;
 115
 116                 if (DMACommandCounter++ > 2000000) break;
 117                 if (CheckForEndlessLoop(addr, lUsedAddr)) break;
 118
 119                 // # 32-bit blocks to transfer
 120                 size += psxMu8( addr + 3 );
 121
 122                 // next 32-bit pointer
 123                 addr = psxMu32( addr & ~0x3 ) & 0xffffff;
 124                 size += 1;
 125         } while (!(addr & 0x800000)); // contrary to some documentation, the end-of-linked-list marker is not actually 0xFF'FFFF
 126                                   // any pointer with bit 23 set will do.
 127
 128         return size;
 129 }
 130
 131 void psxDma2(u32 madr, u32 bcr, u32 chcr) { // GPU
 132         u32 *ptr;
 133         u32 words;
 134         u32 size;
 135
 136         switch (chcr) {
 137                 case 0x01000200: // vram2mem
 138 #ifdef PSXDMA_LOG
 139                         PSXDMA_LOG("*** DMA2 GPU - vram2mem *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
 140 #endif
 141                         ptr = (u32 *)PSXM(madr);
 142                         if (ptr == NULL) {
 143 #ifdef CPU_LOG
 144                                 CPU_LOG("*** DMA2 GPU - vram2mem *** NULL Pointer!!!\n");
 145 #endif
 146                                 break;
 147                         }
 148                         // BA blocks * BS words (word = 32-bits)
 149                         words = (bcr >> 16) * (bcr & 0xffff);
 150                         GPU_readDataMem(ptr, words);
 151                         psxCpu->Clear(madr, words);
 152
 153                         HW_DMA2_MADR = SWAPu32(madr + words * 4);
 154
 155                         // already 32-bit word size ((size * 4) / 4)
 156                         GPUDMA_INT(words / 4);
 157                         return;
 158
 159                 case 0x01000201: // mem2vram
 160 #ifdef PSXDMA_LOG
 161                         PSXDMA_LOG("*** DMA 2 - GPU mem2vram *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
 162 #endif
 163                         ptr = (u32 *)PSXM(madr);
 164                         if (ptr == NULL) {
 165 #ifdef CPU_LOG
 166                                 CPU_LOG("*** DMA2 GPU - mem2vram *** NULL Pointer!!!\n");
 167 #endif
 168                                 break;
 169                         }
 170                         // BA blocks * BS words (word = 32-bits)
 171                         words = (bcr >> 16) * (bcr & 0xffff);
 172                         GPU_writeDataMem(ptr, words);
 173
 174                         HW_DMA2_MADR = SWAPu32(madr + words * 4);
 175
 176                         // already 32-bit word size ((size * 4) / 4)
 177                         GPUDMA_INT(words / 4);
 178                         return;
 179
 180                 case 0x01000401: // dma chain
 181 #ifdef PSXDMA_LOG
 182                         PSXDMA_LOG("*** DMA 2 - GPU dma chain *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
 183 #endif
 184
 185                         size = GPU_dmaChain((u32 *)psxM, madr & 0x1fffff);
 186                         if ((int)size <= 0)
 187                                 size = gpuDmaChainSize(madr);
 188                         HW_GPU_STATUS &= ~PSXGPU_nBUSY;
 189
 190                         // we don't emulate progress, just busy flag and end irq,
 191                         // so pretend we're already at the last block
 192                         HW_DMA2_MADR = SWAPu32(0xffffff);
 193
 194                         // Tekken 3 = use 1.0 only (not 1.5x)
 195
 196                         // Einhander = parse linked list in pieces (todo)
 197                         // Final Fantasy 4 = internal vram time (todo)
 198                         // Rebel Assault 2 = parse linked list in pieces (todo)
 199                         // Vampire Hunter D = allow edits to linked list (todo)
 200                         GPUDMA_INT(size);
 201                         return;
 202
 203 #ifdef PSXDMA_LOG
 204                 default:
 205                         PSXDMA_LOG("*** DMA 2 - GPU unknown *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
 206                         break;
 207 #endif
 208         }
 209
 210         HW_DMA2_CHCR &= SWAP32(~0x01000000);
 211         DMA_INTERRUPT(2);
 212 }
 213
 214 void gpuInterrupt() {
 215         if (HW_DMA2_CHCR & SWAP32(0x01000000))
 216         {
 217                 HW_DMA2_CHCR &= SWAP32(~0x01000000);
 218                 DMA_INTERRUPT(2);
 219         }
 220         HW_GPU_STATUS |= PSXGPU_nBUSY; // GPU no longer busy
 221 }
 222
 223 void psxDma6(u32 madr, u32 bcr, u32 chcr) {
 224         u32 words;
 225         u32 *mem = (u32 *)PSXM(madr);
 226
 227 #ifdef PSXDMA_LOG
 228         PSXDMA_LOG("*** DMA6 OT *** %x addr = %x size = %x\n", chcr, madr, bcr);
 229 #endif
 230
 231         if (chcr == 0x11000002) {
 232                 if (mem == NULL) {
 233 #ifdef CPU_LOG
 234                         CPU_LOG("*** DMA6 OT *** NULL Pointer!!!\n");
 235 #endif
 236                         HW_DMA6_CHCR &= SWAP32(~0x01000000);
 237                         DMA_INTERRUPT(6);
 238                         return;
 239                 }
 240
 241                 // already 32-bit size
 242                 words = bcr;
 243
 244                 while (bcr--) {
 245                         *mem-- = SWAP32((madr - 4) & 0xffffff);
 246                         madr -= 4;
 247                 }
 248                 mem++; *mem = 0xffffff;
 249
 250                 //GPUOTCDMA_INT(size);
 251                 // halted
 252                 psxRegs.cycle += words;
 253                 GPUOTCDMA_INT(16);
 254                 return;
 255         }
 256 #ifdef PSXDMA_LOG
 257         else {
 258                 // Unknown option
 259                 PSXDMA_LOG("*** DMA6 OT - unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
 260         }
 261 #endif
 262
 263         HW_DMA6_CHCR &= SWAP32(~0x01000000);
 264         DMA_INTERRUPT(6);
 265 }
 266
 267 void gpuotcInterrupt()
 268 {
 269         if (HW_DMA6_CHCR & SWAP32(0x01000000))
 270         {
 271                 HW_DMA6_CHCR &= SWAP32(~0x01000000);
 272                 DMA_INTERRUPT(6);
 273         }
 274 }