[picodrive.git] / Pico / carthw / svp / svp.c

// The SVP chip emulator

// (c) Copyright 2008, Grazvydas "notaz" Ignotas
// Free for non-commercial use.

// For commercial use, separate licencing terms must be obtained.


#include "../../PicoInt.h"

svp_t *svp = NULL;
int PicoSVPCycles = 1000; // cycles/line

/* save state stuff */
typedef enum {
	CHUNK_IRAM = CHUNK_CARTHW,
	CHUNK_DRAM,
	CHUNK_SSP
} chunk_name_e;

static carthw_state_chunk svp_states[] =
{
	{ CHUNK_IRAM, 0x800,                 NULL },
	{ CHUNK_DRAM, sizeof(svp->dram),     NULL },
	{ CHUNK_SSP,  sizeof(svp->ssp1601),  NULL },
	{ 0,          0,                     NULL }
};


static void PicoSVPReset(void)
{
	elprintf(EL_SVP, "SVP reset");

	memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
	ssp1601_reset(&svp->ssp1601);
}


static void PicoSVPLine(int count)
{
	// ???
	ssp1601_run(PicoSVPCycles * count);

	// test mode
	//if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
}


static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
{
	if (source < Pico.romsize) // Rom
	{
		source -= 2;
		*srcp = (unsigned short *)(Pico.rom + (source&~1));
		*limitp = (unsigned short *)(Pico.rom + Pico.romsize);
		return 1;
	}
	else if ((source & 0xfe0000) == 0x300000)
	{
		elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
		source &= 0x1fffe;
		source -= 2;
		*srcp = (unsigned short *)(svp->dram + source);
		*limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
		return 1;
	}
	else
		elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);

	return 0;
}


void PicoSVPInit(void)
{
	void *tmp;

	elprintf(EL_SVP, "SVP init");

	tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
	if (tmp == NULL)
	{
		elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
		return;
	}

	Pico.rom = tmp;
	svp = (void *) ((char *)tmp + 0x200000);
	memset(svp, 0, sizeof(*svp));

	// init ok, setup hooks..
	PicoRead16Hook = PicoSVPRead16;
	PicoWrite8Hook = PicoSVPWrite8;
	PicoWrite16Hook = PicoSVPWrite16;
	PicoDmaHook = PicoSVPDma;
	PicoResetHook = PicoSVPReset;
	PicoLineHook = PicoSVPLine;

	// save state stuff
	svp_states[0].ptr = svp->iram_rom;
	svp_states[1].ptr = svp->dram;
	svp_states[2].ptr = &svp->ssp1601;
	carthw_chunks = svp_states;
}
Commit	Line	Data
	1	// The SVP chip emulator
	2
	3	// (c) Copyright 2008, Grazvydas "notaz" Ignotas
	4	// Free for non-commercial use.
	5
	6	// For commercial use, separate licencing terms must be obtained.
	7
	8
	9	#include "../../PicoInt.h"
	10
	11	svp_t *svp = NULL;
	12	int PicoSVPCycles = 1000; // cycles/line
	13
	14	/* save state stuff */
	15	typedef enum {
	16	CHUNK_IRAM = CHUNK_CARTHW,
	17	CHUNK_DRAM,
	18	CHUNK_SSP
	19	} chunk_name_e;
	20
	21	static carthw_state_chunk svp_states[] =
	22	{
	23	{ CHUNK_IRAM, 0x800, NULL },
	24	{ CHUNK_DRAM, sizeof(svp->dram), NULL },
	25	{ CHUNK_SSP, sizeof(svp->ssp1601), NULL },
	26	{ 0, 0, NULL }
	27	};
	28
	29
	30	static void PicoSVPReset(void)
	31	{
	32	elprintf(EL_SVP, "SVP reset");
	33
	34	memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
	35	ssp1601_reset(&svp->ssp1601);
	36	}
	37
	38
	39	static void PicoSVPLine(int count)
	40	{
	41	// ???
	42	ssp1601_run(PicoSVPCycles * count);
	43
	44	// test mode
	45	//if (Pico.m.frame_count == 13) PicoPad[0] \|= 0xff;
	46	}
	47
	48
	49	static int PicoSVPDma(unsigned int source, int len, unsigned short srcp, unsigned short limitp)
	50	{
	51	if (source < Pico.romsize) // Rom
	52	{
	53	source -= 2;
	54	srcp = (unsigned short )(Pico.rom + (source&~1));
	55	limitp = (unsigned short )(Pico.rom + Pico.romsize);
	56	return 1;
	57	}
	58	else if ((source & 0xfe0000) == 0x300000)
	59	{
	60	elprintf(EL_VDPDMA\|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
	61	source &= 0x1fffe;
	62	source -= 2;
	63	srcp = (unsigned short )(svp->dram + source);
	64	limitp = (unsigned short )(svp->dram + sizeof(svp->dram));
	65	return 1;
	66	}
	67	else
	68	elprintf(EL_VDPDMA\|EL_SVP\|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
	69
	70	return 0;
	71	}
	72
	73
	74	void PicoSVPInit(void)
	75	{
	76	void *tmp;
	77
	78	elprintf(EL_SVP, "SVP init");
	79
	80	tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
	81	if (tmp == NULL)
	82	{
	83	elprintf(EL_STATUS\|EL_SVP, "OOM for SVP data");
	84	return;
	85	}
	86
	87	Pico.rom = tmp;
	88	svp = (void ) ((char )tmp + 0x200000);
	89	memset(svp, 0, sizeof(*svp));
	90
	91	// init ok, setup hooks..
	92	PicoRead16Hook = PicoSVPRead16;
	93	PicoWrite8Hook = PicoSVPWrite8;
	94	PicoWrite16Hook = PicoSVPWrite16;
	95	PicoDmaHook = PicoSVPDma;
	96	PicoResetHook = PicoSVPReset;
	97	PicoLineHook = PicoSVPLine;
	98
	99	// save state stuff
	100	svp_states[0].ptr = svp->iram_rom;
	101	svp_states[1].ptr = svp->dram;
	102	svp_states[2].ptr = &svp->ssp1601;
	103	carthw_chunks = svp_states;
	104	}
	105