[pcsx_rearmed.git] / libpcsxcore / psxdma.c

/***************************************************************************
 *   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"
#include "gpu.h"

// Dma0/1 in Mdec.c
// Dma3   in CdRom.c

void spuInterrupt() {
	if (HW_DMA4_CHCR & SWAP32(0x01000000))
	{
		HW_DMA4_CHCR &= SWAP32(~0x01000000);
		DMA_INTERRUPT(4);
	}
}

void psxDma4(u32 madr, u32 bcr, u32 chcr) { // SPU
	u16 *ptr;
	u32 words;

	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;
			}
			words = (bcr >> 16) * (bcr & 0xffff);
			SPU_writeDMAMem(ptr, words * 2, psxRegs.cycle);
			HW_DMA4_MADR = SWAPu32(madr + words * 4);
			SPUDMA_INT(words / 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;
			}
			words = (bcr >> 16) * (bcr & 0xffff);
			SPU_readDMAMem(ptr, words * 2, psxRegs.cycle);
			psxCpu->Clear(madr, words);

			HW_DMA4_MADR = SWAPu32(madr + words * 4);
			SPUDMA_INT(words / 2);
			return;

#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);
}

// Taken from PEOPS SOFTGPU
static inline boolean CheckForEndlessLoop(u32 laddr, u32 *lUsedAddr) {
	if (laddr == lUsedAddr[1]) return TRUE;
	if (laddr == lUsedAddr[2]) return TRUE;

	if (laddr < lUsedAddr[0]) lUsedAddr[1] = laddr;
	else lUsedAddr[2] = laddr;

	lUsedAddr[0] = laddr;

	return FALSE;
}

static u32 gpuDmaChainSize(u32 addr) {
	u32 size;
	u32 DMACommandCounter = 0;
	u32 lUsedAddr[3];

	lUsedAddr[0] = lUsedAddr[1] = lUsedAddr[2] = 0xffffff;

	// initial linked list ptr (word)
	size = 1;

	do {
		addr &= 0x1ffffc;

		if (DMACommandCounter++ > 2000000) break;
		if (CheckForEndlessLoop(addr, lUsedAddr)) break;

		// # 32-bit blocks to transfer
		size += psxMu8( addr + 3 );

		// next 32-bit pointer
		addr = psxMu32( addr & ~0x3 ) & 0xffffff;
		size += 1;
	} while (!(addr & 0x800000)); // contrary to some documentation, the end-of-linked-list marker is not actually 0xFF'FFFF
                                  // any pointer with bit 23 set will do.

	return size;
}

void psxDma2(u32 madr, u32 bcr, u32 chcr) { // GPU
	u32 *ptr;
	u32 words;
	u32 size;

	switch (chcr) {
		case 0x01000200: // vram2mem
#ifdef PSXDMA_LOG
			PSXDMA_LOG("*** DMA2 GPU - vram2mem *** %lx addr = %lx size = %lx\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;
			}
			// BA blocks * BS words (word = 32-bits)
			words = (bcr >> 16) * (bcr & 0xffff);
			GPU_readDataMem(ptr, words);
			psxCpu->Clear(madr, words);

			HW_DMA2_MADR = SWAPu32(madr + words * 4);

			// already 32-bit word size ((size * 4) / 4)
			GPUDMA_INT(words / 4);
			return;

		case 0x01000201: // mem2vram
#ifdef PSXDMA_LOG
			PSXDMA_LOG("*** DMA 2 - GPU mem2vram *** %lx addr = %lx size = %lx\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;
			}
			// BA blocks * BS words (word = 32-bits)
			words = (bcr >> 16) * (bcr & 0xffff);
			GPU_writeDataMem(ptr, words);

			HW_DMA2_MADR = SWAPu32(madr + words * 4);

			// already 32-bit word size ((size * 4) / 4)
			GPUDMA_INT(words / 4);
			return;

		case 0x01000401: // dma chain
#ifdef PSXDMA_LOG
			PSXDMA_LOG("*** DMA 2 - GPU dma chain *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
#endif

			size = GPU_dmaChain((u32 *)psxM, madr & 0x1fffff);
			if ((int)size <= 0)
				size = gpuDmaChainSize(madr);
			HW_GPU_STATUS &= ~PSXGPU_nBUSY;

			// we don't emulate progress, just busy flag and end irq,
			// so pretend we're already at the last block
			HW_DMA2_MADR = SWAPu32(0xffffff);

			// Tekken 3 = use 1.0 only (not 1.5x)

			// Einhander = parse linked list in pieces (todo)
			// Final Fantasy 4 = internal vram time (todo)
			// Rebel Assault 2 = parse linked list in pieces (todo)
			// Vampire Hunter D = allow edits to linked list (todo)
			GPUDMA_INT(size);
			return;

#ifdef PSXDMA_LOG
		default:
			PSXDMA_LOG("*** DMA 2 - GPU unknown *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
			break;
#endif
	}

	HW_DMA2_CHCR &= SWAP32(~0x01000000);
	DMA_INTERRUPT(2);
}

void gpuInterrupt() {
	if (HW_DMA2_CHCR & SWAP32(0x01000000))
	{
		HW_DMA2_CHCR &= SWAP32(~0x01000000);
		DMA_INTERRUPT(2);
	}
	HW_GPU_STATUS |= PSXGPU_nBUSY; // GPU no longer busy
}

void psxDma6(u32 madr, u32 bcr, u32 chcr) {
	u32 words;
	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;
		}

		// already 32-bit size
		words = bcr;

		while (bcr--) {
			*mem-- = SWAP32((madr - 4) & 0xffffff);
			madr -= 4;
		}
		mem++; *mem = 0xffffff;

		//GPUOTCDMA_INT(size);
		// halted
		psxRegs.cycle += words;
		GPUOTCDMA_INT(16);
		return;
	}
#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);
}

void gpuotcInterrupt()
{
	if (HW_DMA6_CHCR & SWAP32(0x01000000))
	{
		HW_DMA6_CHCR &= SWAP32(~0x01000000);
		DMA_INTERRUPT(6);
	}
}
Commit	Line	Data
	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	}