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 "../../PicoInt.h"
12 int PicoSVPCycles = 1000; // cycles/line
14 /* save state stuff */
16 CHUNK_IRAM = CHUNK_CARTHW,
21 static carthw_state_chunk svp_states[] =
23 { CHUNK_IRAM, 0x800, NULL },
24 { CHUNK_DRAM, sizeof(svp->dram), NULL },
25 { CHUNK_SSP, sizeof(svp->ssp1601), NULL },
30 static void PicoSVPReset(void)
32 elprintf(EL_SVP, "SVP reset");
34 memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
35 ssp1601_reset(&svp->ssp1601);
39 static void PicoSVPLine(int count)
42 ssp1601_run(PicoSVPCycles * count);
45 //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
49 static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
51 if (source < Pico.romsize) // Rom
54 *srcp = (unsigned short *)(Pico.rom + (source&~1));
55 *limitp = (unsigned short *)(Pico.rom + Pico.romsize);
58 else if ((source & 0xfe0000) == 0x300000)
60 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
63 *srcp = (unsigned short *)(svp->dram + source);
64 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
68 elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
74 void PicoSVPInit(void)
78 elprintf(EL_SVP, "SVP init");
80 tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
83 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
88 svp = (void *) ((char *)tmp + 0x200000);
89 memset(svp, 0, sizeof(*svp));
91 // init ok, setup hooks..
92 PicoRead16Hook = PicoSVPRead16;
93 PicoWrite8Hook = PicoSVPWrite8;
94 PicoWrite16Hook = PicoSVPWrite16;
95 PicoDmaHook = PicoSVPDma;
96 PicoResetHook = PicoSVPReset;
97 PicoLineHook = PicoSVPLine;
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;