[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"

#ifndef min
#define min(a, b) ((b) < (a) ? (b) : (a))
#endif
#ifndef PSXDMA_LOG
#define PSXDMA_LOG(...)
#endif

// 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
	u32 words, words_max = 0, words_copy;
	u16 *ptr;

	madr &= ~3;
	ptr = getDmaRam(madr, &words_max);
	if (ptr == INVALID_PTR)
		log_unhandled("bad dma4 madr %x\n", madr);

	words = words_copy = (bcr >> 16) * (bcr & 0xffff);
	if (words_copy > words_max) {
		log_unhandled("bad dma4 madr %x bcr %x\n", madr, bcr);
		words_copy = words_max;
	}

	switch (chcr) {
		case 0x01000201: //cpu to spu transfer
			PSXDMA_LOG("*** DMA4 SPU - mem2spu *** %x addr = %x size = %x\n", chcr, madr, bcr);
			if (ptr == INVALID_PTR)
				break;
			SPU_writeDMAMem(ptr, words_copy * 2, psxRegs.cycle);
			HW_DMA4_MADR = SWAPu32(madr + words_copy * 2);
			SPUDMA_INT(words * 4);
			return;

		case 0x01000200: //spu to cpu transfer
			PSXDMA_LOG("*** DMA4 SPU - spu2mem *** %x addr = %x size = %x\n", chcr, madr, bcr);
			if (ptr == INVALID_PTR)
				break;
			SPU_readDMAMem(ptr, words_copy * 2, psxRegs.cycle);
			psxCpu->Clear(madr, words_copy);

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

		default:
			log_unhandled("*** DMA4 SPU - unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
			break;
	}

	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, madr_next, *madr_next_p, size;
	u32 words, words_left, words_max, words_copy;
	int do_walking;

	madr &= ~3;
	switch (chcr) {
		case 0x01000200: // vram2mem
			PSXDMA_LOG("*** DMA2 GPU - vram2mem *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
			ptr = getDmaRam(madr, &words_max);
			if (ptr == INVALID_PTR) {
				log_unhandled("bad dma2 madr %x\n", madr);
				break;
			}
			// BA blocks * BS words (word = 32-bits)
			words = words_copy = (bcr >> 16) * (bcr & 0xffff);
			if (words > words_max) {
				log_unhandled("bad dma2 madr %x bcr %x\n", madr, bcr);
				words_copy = words_max;
			}
			GPU_readDataMem(ptr, words_copy);
			psxCpu->Clear(madr, words_copy);

			HW_DMA2_MADR = SWAPu32(madr + words_copy * 4);

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

		case 0x01000201: // mem2vram
			PSXDMA_LOG("*** DMA 2 - GPU mem2vram *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
			words = words_left = (bcr >> 16) * (bcr & 0xffff);
			while (words_left > 0) {
				ptr = getDmaRam(madr, &words_max);
				if (ptr == INVALID_PTR) {
					log_unhandled("bad2 dma madr %x\n", madr);
					break;
				}
				words_copy = min(words_left, words_max);
				GPU_writeDataMem(ptr, words_copy);
				words_left -= words_copy;
				madr += words_copy * 4;
			}

			HW_DMA2_MADR = SWAPu32(madr);

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

		case 0x01000401: // dma chain
			PSXDMA_LOG("*** DMA 2 - GPU dma chain *** %lx addr = %lx size = %lx\n", chcr, madr, bcr);
			// when not emulating walking progress, end immediately
			madr_next = 0xffffff;

			do_walking = Config.GpuListWalking;
			if (do_walking < 0)
				do_walking = Config.hacks.gpu_slow_list_walking;
			madr_next_p = do_walking ? &madr_next : NULL;

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

			HW_GPU_STATUS &= SWAP32(~PSXGPU_nBUSY);
			HW_DMA2_MADR = SWAPu32(madr_next);

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

			// Einhander = parse linked list in pieces (todo)
			// Rebel Assault 2 = parse linked list in pieces (todo)
			GPUDMA_INT(size);
			return;

		default:
			log_unhandled("*** DMA 2 - GPU unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
			break;
	}

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

void gpuInterrupt() {
	if (HW_DMA2_CHCR == SWAP32(0x01000401) && !(HW_DMA2_MADR & SWAP32(0x800000)))
	{
		u32 size, madr_next = 0xffffff;
		size = GPU_dmaChain((u32 *)psxM, HW_DMA2_MADR & 0x1fffff, &madr_next);
		HW_DMA2_MADR = SWAPu32(madr_next);
		GPUDMA_INT(size);
		return;
	}
	if (HW_DMA2_CHCR & SWAP32(0x01000000))
	{
		HW_DMA2_CHCR &= SWAP32(~0x01000000);
		DMA_INTERRUPT(2);
	}
	HW_GPU_STATUS |= SWAP32(PSXGPU_nBUSY); // GPU no longer busy
}

void psxDma6(u32 madr, u32 bcr, u32 chcr) {
	u32 words, words_max;
	u32 *mem;

	PSXDMA_LOG("*** DMA6 OT *** %x addr = %x size = %x\n", chcr, madr, bcr);

	if (chcr == 0x11000002) {
		mem = getDmaRam(madr, &words_max);
		if (mem == INVALID_PTR) {
			log_unhandled("bad6 dma madr %x\n", madr);
			HW_DMA6_CHCR &= SWAP32(~0x11000000);
			DMA_INTERRUPT(6);
			return;
		}

		// already 32-bit size
		words = bcr;

		while (bcr-- && mem > (u32 *)psxM) {
			*mem-- = SWAP32((madr - 4) & 0xffffff);
			madr -= 4;
		}
		*++mem = SWAP32(0xffffff);

		//GPUOTCDMA_INT(size);
		// halted
		psxRegs.cycle += words;
		GPUOTCDMA_INT(16);
		return;
	}
	else {
		// Unknown option
		log_unhandled("*** DMA6 OT - unknown *** %x addr = %x size = %x\n", chcr, madr, bcr);
	}

	HW_DMA6_CHCR &= SWAP32(~0x11000000);
	DMA_INTERRUPT(6);
}

void gpuotcInterrupt()
{
	if (HW_DMA6_CHCR & SWAP32(0x01000000))
	{
		HW_DMA6_CHCR &= SWAP32(~0x11000000);
		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	#ifndef min
	28	#define min(a, b) ((b) < (a) ? (b) : (a))
	29	#endif
	30	#ifndef PSXDMA_LOG
	31	#define PSXDMA_LOG(...)
	32	#endif
	33
	34	// Dma0/1 in Mdec.c
	35	// Dma3 in CdRom.c
	36
	37	void spuInterrupt() {
	38	if (HW_DMA4_CHCR & SWAP32(0x01000000))
	39	{
	40	HW_DMA4_CHCR &= SWAP32(~0x01000000);
	41	DMA_INTERRUPT(4);
	42	}
	43	}
	44
	45	void psxDma4(u32 madr, u32 bcr, u32 chcr) { // SPU
	46	u32 words, words_max = 0, words_copy;
	47	u16 *ptr;
	48
	49	madr &= ~3;
	50	ptr = getDmaRam(madr, &words_max);
	51	if (ptr == INVALID_PTR)
	52	log_unhandled("bad dma4 madr %x\n", madr);
	53
	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;
	58	}
	59
	60	switch (chcr) {
	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)
	64	break;
	65	SPU_writeDMAMem(ptr, words_copy * 2, psxRegs.cycle);
	66	HW_DMA4_MADR = SWAPu32(madr + words_copy * 2);
	67	SPUDMA_INT(words * 4);
	68	return;
	69
	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)
	73	break;
	74	SPU_readDMAMem(ptr, words_copy * 2, psxRegs.cycle);
	75	psxCpu->Clear(madr, words_copy);
	76
	77	HW_DMA4_MADR = SWAPu32(madr + words_copy * 4);
	78	SPUDMA_INT(words * 4);
	79	return;
	80
	81	default:
	82	log_unhandled("* DMA4 SPU - unknown * %x addr = %x size = %x\n", chcr, madr, bcr);
	83	break;
	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, madr_next, madr_next_p, size;
	133	u32 words, words_left, words_max, words_copy;
	134	int do_walking;
	135
	136	madr &= ~3;
	137	switch (chcr) {
	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);
	143	break;
	144	}
	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;
	150	}
	151	GPU_readDataMem(ptr, words_copy);
	152	psxCpu->Clear(madr, words_copy);
	153
	154	HW_DMA2_MADR = SWAPu32(madr + words_copy * 4);
	155
	156	// already 32-bit word size ((size * 4) / 4)
	157	GPUDMA_INT(words / 4);
	158	return;
	159
	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);
	167	break;
	168	}
	169	words_copy = min(words_left, words_max);
	170	GPU_writeDataMem(ptr, words_copy);
	171	words_left -= words_copy;
	172	madr += words_copy * 4;
	173	}
	174
	175	HW_DMA2_MADR = SWAPu32(madr);
	176
	177	// already 32-bit word size ((size * 4) / 4)
	178	GPUDMA_INT(words / 4);
	179	return;
	180
	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;
	185
	186	do_walking = Config.GpuListWalking;
	187	if (do_walking < 0)
	188	do_walking = Config.hacks.gpu_slow_list_walking;
	189	madr_next_p = do_walking ? &madr_next : NULL;
	190
	191	size = GPU_dmaChain((u32 *)psxM, madr & 0x1fffff, madr_next_p);
	192	if ((int)size <= 0)
	193	size = gpuDmaChainSize(madr);
	194
	195	HW_GPU_STATUS &= SWAP32(~PSXGPU_nBUSY);
	196	HW_DMA2_MADR = SWAPu32(madr_next);
	197
	198	// Tekken 3 = use 1.0 only (not 1.5x)
	199
	200	// Einhander = parse linked list in pieces (todo)
	201	// Rebel Assault 2 = parse linked list in pieces (todo)
	202	GPUDMA_INT(size);
	203	return;
	204
	205	default:
	206	log_unhandled("* DMA 2 - GPU unknown * %x addr = %x size = %x\n", chcr, madr, bcr);
	207	break;
	208	}
	209
	210	HW_DMA2_CHCR &= SWAP32(~0x01000000);
	211	DMA_INTERRUPT(2);
	212	}
	213
	214	void gpuInterrupt() {
	215	if (HW_DMA2_CHCR == SWAP32(0x01000401) && !(HW_DMA2_MADR & SWAP32(0x800000)))
	216	{
	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);
	220	GPUDMA_INT(size);
	221	return;
	222	}
	223	if (HW_DMA2_CHCR & SWAP32(0x01000000))
	224	{
	225	HW_DMA2_CHCR &= SWAP32(~0x01000000);
	226	DMA_INTERRUPT(2);
	227	}
	228	HW_GPU_STATUS \|= SWAP32(PSXGPU_nBUSY); // GPU no longer busy
	229	}
	230
	231	void psxDma6(u32 madr, u32 bcr, u32 chcr) {
	232	u32 words, words_max;
	233	u32 *mem;
	234
	235	PSXDMA_LOG("* DMA6 OT * %x addr = %x size = %x\n", chcr, madr, bcr);
	236
	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);
	242	DMA_INTERRUPT(6);
	243	return;
	244	}
	245
	246	// already 32-bit size
	247	words = bcr;
	248
	249	while (bcr-- && mem > (u32 *)psxM) {
	250	*mem-- = SWAP32((madr - 4) & 0xffffff);
	251	madr -= 4;
	252	}
	253	*++mem = SWAP32(0xffffff);
	254
	255	//GPUOTCDMA_INT(size);
	256	// halted
	257	psxRegs.cycle += words;
	258	GPUOTCDMA_INT(16);
	259	return;
	260	}
	261	else {
	262	// Unknown option
	263	log_unhandled("* DMA6 OT - unknown * %x addr = %x size = %x\n", chcr, madr, bcr);
	264	}
	265
	266	HW_DMA6_CHCR &= SWAP32(~0x11000000);
	267	DMA_INTERRUPT(6);
	268	}
	269
	270	void gpuotcInterrupt()
	271	{
	272	if (HW_DMA6_CHCR & SWAP32(0x01000000))
	273	{
	274	HW_DMA6_CHCR &= SWAP32(~0x11000000);
	275	DMA_INTERRUPT(6);
	276	}
	277	}