1 // The SVP chip emulator
3 // (c) Copyright 2008, Grazvydas "notaz" Ignotas
4 // Free for non-commercial use.
6 // For commercial use, separate licencing terms must be obtained.
9 #include "../../pico_int.h"
13 int PicoSVPCycles = 850; // cycles/line, just a guess
14 static int svp_dyn_ready = 0;
16 /* save state stuff */
18 CHUNK_IRAM = CHUNK_CARTHW,
23 static carthw_state_chunk svp_states[] =
25 { CHUNK_IRAM, 0x800, NULL },
26 { CHUNK_DRAM, sizeof(svp->dram), NULL },
27 { CHUNK_SSP, sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc), NULL },
32 static void PicoSVPReset(void)
34 elprintf(EL_SVP, "SVP reset");
36 memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
37 ssp1601_reset(&svp->ssp1601);
39 if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready)
40 ssp1601_dyn_reset(&svp->ssp1601);
45 static void PicoSVPLine(void)
48 #if defined(ARM) || defined(PSP)
50 static int delay_lines = 0;
52 if ((Pico.m.scanline&0xf) != 0xf && Pico.m.scanline != 261 && Pico.m.scanline != 311)
59 if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready)
60 ssp1601_dyn_run(PicoSVPCycles * count);
64 ssp1601_run(PicoSVPCycles * count);
65 svp_dyn_ready = 0; // just in case
69 //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
73 static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
75 if (source < Pico.romsize) // Rom
78 *srcp = (unsigned short *)(Pico.rom + (source&~1));
79 *limitp = (unsigned short *)(Pico.rom + Pico.romsize);
82 else if ((source & 0xfe0000) == 0x300000)
84 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
87 *srcp = (unsigned short *)(svp->dram + source);
88 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
92 elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
98 void PicoSVPInit(void)
103 void PicoSVPStartup(void)
107 elprintf(EL_STATUS, "SVP startup");
109 tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
112 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
116 //PicoOpt &= ~0x20000;
118 svp = (void *) ((char *)tmp + 0x200000);
119 memset(svp, 0, sizeof(*svp));
124 if (PicoOpt & POPT_EN_SVP_DRC) {
125 if (ssp1601_dyn_startup())
131 // init ok, setup hooks..
132 PicoCartMemSetup = PicoSVPMemSetup;
133 PicoDmaHook = PicoSVPDma;
134 PicoResetHook = PicoSVPReset;
135 PicoLineHook = PicoSVPLine;
138 svp_states[0].ptr = svp->iram_rom;
139 svp_states[1].ptr = svp->dram;
140 svp_states[2].ptr = &svp->ssp1601;
141 carthw_chunks = svp_states;