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.
28 #define min(a, b) ((b) < (a) ? (b) : (a))
31 #define PSXDMA_LOG(...)
38 if (HW_DMA4_CHCR & SWAP32(0x01000000))
40 HW_DMA4_CHCR &= SWAP32(~0x01000000);
45 void psxDma4(u32 madr, u32 bcr, u32 chcr) { // SPU
46 u32 words, words_max = 0, words_copy;
50 ptr = getDmaRam(madr, &words_max);
51 if (ptr == INVALID_PTR)
52 log_unhandled("bad dma4 madr %x\n", madr);
54 words = words_copy = (bcr >> 16) * (bcr & 0xffff);
55 if (words_copy > words_max) {
56 log_unhandled("bad dma4 madr %x bcr %x\n", madr, bcr);
57 words_copy = words_max;
61 case 0x01000201: //cpu to spu transfer
62 PSXDMA_LOG("*** DMA4 SPU - mem2spu *** %x addr = %x size = %x\n", chcr, madr, bcr);
63 if (ptr == INVALID_PTR)
65 SPU_writeDMAMem(ptr, words_copy * 2, psxRegs.cycle);
66 HW_DMA4_MADR = SWAPu32(madr + words_copy * 2);
67 SPUDMA_INT(words * 4);
70 case 0x01000200: //spu to cpu transfer
71 PSXDMA_LOG("*** DMA4 SPU - spu2mem *** %x addr = %x size = %x\n", chcr, madr, bcr);
72 if (ptr == INVALID_PTR)
74 SPU_readDMAMem(ptr, words_copy * 2, psxRegs.cycle);
75 psxCpu->Clear(madr, words_copy);
77 HW_DMA4_MADR = SWAPu32(madr + words_copy * 4);
78 SPUDMA_INT(words * 4);
82 log_unhandled("*** 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
132 u32 *ptr, madr_next, *madr_next_p, size;
133 u32 words, words_left, words_max, words_copy;
138 case 0x01000200: // vram2mem
139 PSXDMA_LOG("*** DMA2 GPU - vram2mem *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
140 ptr = getDmaRam(madr, &words_max);
141 if (ptr == INVALID_PTR) {
142 log_unhandled("bad dma2 madr %x\n", madr);
145 // BA blocks * BS words (word = 32-bits)
146 words = words_copy = (bcr >> 16) * (bcr & 0xffff);
147 if (words > words_max) {
148 log_unhandled("bad dma2 madr %x bcr %x\n", madr, bcr);
149 words_copy = words_max;
151 GPU_readDataMem(ptr, words_copy);
152 psxCpu->Clear(madr, words_copy);
154 HW_DMA2_MADR = SWAPu32(madr + words_copy * 4);
156 // already 32-bit word size ((size * 4) / 4)
157 GPUDMA_INT(words / 4);
160 case 0x01000201: // mem2vram
161 PSXDMA_LOG("*** DMA 2 - GPU mem2vram *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
162 words = words_left = (bcr >> 16) * (bcr & 0xffff);
163 while (words_left > 0) {
164 ptr = getDmaRam(madr, &words_max);
165 if (ptr == INVALID_PTR) {
166 log_unhandled("bad2 dma madr %x\n", madr);
169 words_copy = min(words_left, words_max);
170 GPU_writeDataMem(ptr, words_copy);
171 words_left -= words_copy;
172 madr += words_copy * 4;
175 HW_DMA2_MADR = SWAPu32(madr);
177 // already 32-bit word size ((size * 4) / 4)
178 GPUDMA_INT(words / 4);
181 case 0x01000401: // dma chain
182 PSXDMA_LOG("*** DMA 2 - GPU dma chain *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
183 // when not emulating walking progress, end immediately
184 madr_next = 0xffffff;
186 do_walking = Config.GpuListWalking;
188 do_walking = Config.hacks.gpu_slow_list_walking;
189 madr_next_p = do_walking ? &madr_next : NULL;
191 size = GPU_dmaChain((u32 *)psxM, madr & 0x1fffff, madr_next_p);
193 size = gpuDmaChainSize(madr);
195 HW_GPU_STATUS &= SWAP32(~PSXGPU_nBUSY);
196 HW_DMA2_MADR = SWAPu32(madr_next);
198 // Tekken 3 = use 1.0 only (not 1.5x)
200 // Einhander = parse linked list in pieces (todo)
201 // Rebel Assault 2 = parse linked list in pieces (todo)
206 log_unhandled("*** DMA 2 - GPU unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
210 HW_DMA2_CHCR &= SWAP32(~0x01000000);
214 void gpuInterrupt() {
215 if (HW_DMA2_CHCR == SWAP32(0x01000401) && !(HW_DMA2_MADR & SWAP32(0x800000)))
217 u32 size, madr_next = 0xffffff;
218 size = GPU_dmaChain((u32 *)psxM, HW_DMA2_MADR & 0x1fffff, &madr_next);
219 HW_DMA2_MADR = SWAPu32(madr_next);
223 if (HW_DMA2_CHCR & SWAP32(0x01000000))
225 HW_DMA2_CHCR &= SWAP32(~0x01000000);
228 HW_GPU_STATUS |= SWAP32(PSXGPU_nBUSY); // GPU no longer busy
231 void psxDma6(u32 madr, u32 bcr, u32 chcr) {
232 u32 words, words_max;
235 PSXDMA_LOG("*** DMA6 OT *** %x addr = %x size = %x\n", chcr, madr, bcr);
237 if (chcr == 0x11000002) {
238 mem = getDmaRam(madr, &words_max);
239 if (mem == INVALID_PTR) {
240 log_unhandled("bad6 dma madr %x\n", madr);
241 HW_DMA6_CHCR &= SWAP32(~0x11000000);
246 // already 32-bit size
249 while (bcr-- && mem > (u32 *)psxM) {
250 *mem-- = SWAP32((madr - 4) & 0xffffff);
253 *++mem = SWAP32(0xffffff);
255 //GPUOTCDMA_INT(size);
257 psxRegs.cycle += words;
263 log_unhandled("*** DMA6 OT - unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
266 HW_DMA6_CHCR &= SWAP32(~0x11000000);
270 void gpuotcInterrupt()
272 if (HW_DMA6_CHCR & SWAP32(0x01000000))
274 HW_DMA6_CHCR &= SWAP32(~0x11000000);