1 /***************************************************************************
2 * Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team *
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. *
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. *
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 ***************************************************************************/
21 * Handles PSX DMA functions.
31 if (HW_DMA4_CHCR & SWAP32(0x01000000))
33 HW_DMA4_CHCR &= SWAP32(~0x01000000);
38 void psxDma4(u32 madr, u32 bcr, u32 chcr) { // SPU
43 case 0x01000201: //cpu to spu transfer
45 PSXDMA_LOG("*** DMA4 SPU - mem2spu *** %x addr = %x size = %x\n", chcr, madr, bcr);
47 ptr = (u16 *)PSXM(madr);
50 CPU_LOG("*** DMA4 SPU - mem2spu *** NULL Pointer!!!\n");
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);
60 case 0x01000200: //spu to cpu transfer
62 PSXDMA_LOG("*** DMA4 SPU - spu2mem *** %x addr = %x size = %x\n", chcr, madr, bcr);
64 ptr = (u16 *)PSXM(madr);
67 CPU_LOG("*** DMA4 SPU - spu2mem *** NULL Pointer!!!\n");
71 words = (bcr >> 16) * (bcr & 0xffff);
72 SPU_readDMAMem(ptr, words * 2, psxRegs.cycle);
73 psxCpu->Clear(madr, words);
75 HW_DMA4_MADR = SWAPu32(madr + words * 4);
76 SPUDMA_INT(words / 2);
81 PSXDMA_LOG("*** DMA4 SPU - unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
86 HW_DMA4_CHCR &= SWAP32(~0x01000000);
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;
95 if (laddr < lUsedAddr[0]) lUsedAddr[1] = laddr;
96 else lUsedAddr[2] = laddr;
103 static u32 gpuDmaChainSize(u32 addr) {
105 u32 DMACommandCounter = 0;
108 lUsedAddr[0] = lUsedAddr[1] = lUsedAddr[2] = 0xffffff;
110 // initial linked list ptr (word)
116 if (DMACommandCounter++ > 2000000) break;
117 if (CheckForEndlessLoop(addr, lUsedAddr)) break;
119 // # 32-bit blocks to transfer
120 size += psxMu8( addr + 3 );
122 // next 32-bit pointer
123 addr = psxMu32( addr & ~0x3 ) & 0xffffff;
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.
131 void psxDma2(u32 madr, u32 bcr, u32 chcr) { // GPU
137 case 0x01000200: // vram2mem
139 PSXDMA_LOG("*** DMA2 GPU - vram2mem *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
141 ptr = (u32 *)PSXM(madr);
144 CPU_LOG("*** DMA2 GPU - vram2mem *** NULL Pointer!!!\n");
148 // BA blocks * BS words (word = 32-bits)
149 words = (bcr >> 16) * (bcr & 0xffff);
150 GPU_readDataMem(ptr, words);
151 psxCpu->Clear(madr, words);
153 HW_DMA2_MADR = SWAPu32(madr + words * 4);
155 // already 32-bit word size ((size * 4) / 4)
156 GPUDMA_INT(words / 4);
159 case 0x01000201: // mem2vram
161 PSXDMA_LOG("*** DMA 2 - GPU mem2vram *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
163 ptr = (u32 *)PSXM(madr);
166 CPU_LOG("*** DMA2 GPU - mem2vram *** NULL Pointer!!!\n");
170 // BA blocks * BS words (word = 32-bits)
171 words = (bcr >> 16) * (bcr & 0xffff);
172 GPU_writeDataMem(ptr, words);
174 HW_DMA2_MADR = SWAPu32(madr + words * 4);
176 // already 32-bit word size ((size * 4) / 4)
177 GPUDMA_INT(words / 4);
180 case 0x01000401: // dma chain
182 PSXDMA_LOG("*** DMA 2 - GPU dma chain *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
185 size = GPU_dmaChain((u32 *)psxM, madr & 0x1fffff);
187 size = gpuDmaChainSize(madr);
188 HW_GPU_STATUS &= SWAP32(~PSXGPU_nBUSY);
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);
194 // Tekken 3 = use 1.0 only (not 1.5x)
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)
205 PSXDMA_LOG("*** DMA 2 - GPU unknown *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
210 HW_DMA2_CHCR &= SWAP32(~0x01000000);
214 void gpuInterrupt() {
215 if (HW_DMA2_CHCR & SWAP32(0x01000000))
217 HW_DMA2_CHCR &= SWAP32(~0x01000000);
220 HW_GPU_STATUS |= SWAP32(PSXGPU_nBUSY); // GPU no longer busy
223 void psxDma6(u32 madr, u32 bcr, u32 chcr) {
225 u32 *mem = (u32 *)PSXM(madr);
228 PSXDMA_LOG("*** DMA6 OT *** %x addr = %x size = %x\n", chcr, madr, bcr);
231 if (chcr == 0x11000002) {
234 CPU_LOG("*** DMA6 OT *** NULL Pointer!!!\n");
236 HW_DMA6_CHCR &= SWAP32(~0x01000000);
241 // already 32-bit size
245 *mem-- = SWAP32((madr - 4) & 0xffffff);
248 *++mem = SWAP32(0xffffff);
250 //GPUOTCDMA_INT(size);
252 psxRegs.cycle += words;
259 PSXDMA_LOG("*** DMA6 OT - unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
263 HW_DMA6_CHCR &= SWAP32(~0x01000000);
267 void gpuotcInterrupt()
269 if (HW_DMA6_CHCR & SWAP32(0x01000000))
271 HW_DMA6_CHCR &= SWAP32(~0x01000000);