pcsxr-1.9.92

1 files changed, 174 insertions, 0 deletions

diff --git a/libpcsxcore/psxdma.c b/libpcsxcore/psxdma.c
new file mode 100644
index 0000000..f59f268
--- /dev/null
+++ b/libpcsxcore/psxdma.c
@@ -0,0 +1,174 @@
+/***************************************************************************
+ *   Copyright (C) 2007 Ryan Schultz, PCSX-df Team, PCSX team              *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA.           *
+ ***************************************************************************/
+
+/*
+* Handles PSX DMA functions.
+*/
+
+#include "psxdma.h"
+
+// Dma0/1 in Mdec.c
+// Dma3   in CdRom.c
+
+void spuInterrupt() {
+	HW_DMA4_CHCR &= SWAP32(~0x01000000);
+	DMA_INTERRUPT(4);
+}
+
+void psxDma4(u32 madr, u32 bcr, u32 chcr) { // SPU
+	u16 *ptr;
+	u32 size;
+
+	switch (chcr) {
+		case 0x01000201: //cpu to spu transfer
+#ifdef PSXDMA_LOG
+			PSXDMA_LOG("*** DMA4 SPU - mem2spu *** %x addr = %x size = %x\n", chcr, madr, bcr);
+#endif
+			ptr = (u16 *)PSXM(madr);
+			if (ptr == NULL) {
+#ifdef CPU_LOG
+				CPU_LOG("*** DMA4 SPU - mem2spu *** NULL Pointer!!!\n");
+#endif
+				break;
+			}
+			SPU_writeDMAMem(ptr, (bcr >> 16) * (bcr & 0xffff) * 2);
+			SPUDMA_INT((bcr >> 16) * (bcr & 0xffff) / 2);
+			return;
+
+		case 0x01000200: //spu to cpu transfer
+#ifdef PSXDMA_LOG
+			PSXDMA_LOG("*** DMA4 SPU - spu2mem *** %x addr = %x size = %x\n", chcr, madr, bcr);
+#endif
+			ptr = (u16 *)PSXM(madr);
+			if (ptr == NULL) {
+#ifdef CPU_LOG
+				CPU_LOG("*** DMA4 SPU - spu2mem *** NULL Pointer!!!\n");
+#endif
+				break;
+			}
+			size = (bcr >> 16) * (bcr & 0xffff) * 2;
+			SPU_readDMAMem(ptr, size);
+			psxCpu->Clear(madr, size);
+			break;
+
+#ifdef PSXDMA_LOG
+		default:
+			PSXDMA_LOG("*** DMA4 SPU - unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
+			break;
+#endif
+	}
+
+	HW_DMA4_CHCR &= SWAP32(~0x01000000);
+	DMA_INTERRUPT(4);
+}
+
+void psxDma2(u32 madr, u32 bcr, u32 chcr) { // GPU
+	u32 *ptr;
+	u32 size;
+
+	switch(chcr) {
+		case 0x01000200: // vram2mem
+#ifdef PSXDMA_LOG
+			PSXDMA_LOG("*** DMA2 GPU - vram2mem *** %x addr = %x size = %x\n", chcr, madr, bcr);
+#endif
+			ptr = (u32 *)PSXM(madr);
+			if (ptr == NULL) {
+#ifdef CPU_LOG
+				CPU_LOG("*** DMA2 GPU - vram2mem *** NULL Pointer!!!\n");
+#endif
+				break;
+			}
+			size = (bcr >> 16) * (bcr & 0xffff);
+			GPU_readDataMem(ptr, size);
+			psxCpu->Clear(madr, size);
+			break;
+
+		case 0x01000201: // mem2vram
+#ifdef PSXDMA_LOG
+			PSXDMA_LOG("*** DMA 2 - GPU mem2vram *** %x addr = %x size = %x\n", chcr, madr, bcr);
+#endif
+			ptr = (u32 *)PSXM(madr);
+			if (ptr == NULL) {
+#ifdef CPU_LOG
+				CPU_LOG("*** DMA2 GPU - mem2vram *** NULL Pointer!!!\n");
+#endif
+				break;
+			}
+			size = (bcr >> 16) * (bcr & 0xffff);
+			GPU_writeDataMem(ptr, size);
+			GPUDMA_INT(size / 4);
+			return;
+
+		case 0x01000401: // dma chain
+#ifdef PSXDMA_LOG
+			PSXDMA_LOG("*** DMA 2 - GPU dma chain *** %x addr = %x size = %x\n", chcr, madr, bcr);
+#endif
+			GPU_dmaChain((u32 *)psxM, madr & 0x1fffff);
+			break;
+
+#ifdef PSXDMA_LOG
+		default:
+			PSXDMA_LOG("*** DMA 2 - GPU unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
+			break;
+#endif
+	}
+
+	HW_DMA2_CHCR &= SWAP32(~0x01000000);
+	DMA_INTERRUPT(2);
+}
+
+void gpuInterrupt() {
+	HW_DMA2_CHCR &= SWAP32(~0x01000000);
+	DMA_INTERRUPT(2);
+}
+
+void psxDma6(u32 madr, u32 bcr, u32 chcr) {
+	u32 *mem = (u32 *)PSXM(madr);
+
+#ifdef PSXDMA_LOG
+	PSXDMA_LOG("*** DMA6 OT *** %x addr = %x size = %x\n", chcr, madr, bcr);
+#endif
+
+	if (chcr == 0x11000002) {
+		if (mem == NULL) {
+#ifdef CPU_LOG
+			CPU_LOG("*** DMA6 OT *** NULL Pointer!!!\n");
+#endif
+			HW_DMA6_CHCR &= SWAP32(~0x01000000);
+			DMA_INTERRUPT(6);
+			return;
+		}
+
+		while (bcr--) {
+			*mem-- = SWAP32((madr - 4) & 0xffffff);
+			madr -= 4;
+		}
+		mem++; *mem = 0xffffff;
+	}
+#ifdef PSXDMA_LOG
+	else {
+		// Unknown option
+		PSXDMA_LOG("*** DMA6 OT - unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
+	}
+#endif
+
+	HW_DMA6_CHCR &= SWAP32(~0x01000000);
+	DMA_INTERRUPT(6);
+}
+