| 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 | if (!(PicoOpt&0x20000)) |
| 37 | ssp1601_dyn_reset(&svp->ssp1601); |
| 38 | } |
| 39 | |
| 40 | |
| 41 | static void PicoSVPLine(int count) |
| 42 | { |
| 43 | // ??? |
| 44 | if (PicoOpt&0x20000) |
| 45 | ssp1601_run(PicoSVPCycles * count); |
| 46 | else |
| 47 | ssp1601_dyn_run(PicoSVPCycles * count); |
| 48 | |
| 49 | // test mode |
| 50 | //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff; |
| 51 | } |
| 52 | |
| 53 | |
| 54 | static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) |
| 55 | { |
| 56 | if (source < Pico.romsize) // Rom |
| 57 | { |
| 58 | source -= 2; |
| 59 | *srcp = (unsigned short *)(Pico.rom + (source&~1)); |
| 60 | *limitp = (unsigned short *)(Pico.rom + Pico.romsize); |
| 61 | return 1; |
| 62 | } |
| 63 | else if ((source & 0xfe0000) == 0x300000) |
| 64 | { |
| 65 | elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len); |
| 66 | source &= 0x1fffe; |
| 67 | source -= 2; |
| 68 | *srcp = (unsigned short *)(svp->dram + source); |
| 69 | *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram)); |
| 70 | return 1; |
| 71 | } |
| 72 | else |
| 73 | elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len); |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | |
| 79 | void PicoSVPInit(void) |
| 80 | { |
| 81 | void *tmp; |
| 82 | |
| 83 | elprintf(EL_SVP, "SVP init"); |
| 84 | |
| 85 | tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp)); |
| 86 | if (tmp == NULL) |
| 87 | { |
| 88 | elprintf(EL_STATUS|EL_SVP, "OOM for SVP data"); |
| 89 | return; |
| 90 | } |
| 91 | |
| 92 | Pico.rom = tmp; |
| 93 | svp = (void *) ((char *)tmp + 0x200000); |
| 94 | memset(svp, 0, sizeof(*svp)); |
| 95 | |
| 96 | // init SVP compiler |
| 97 | if (!(PicoOpt&0x20000)) { |
| 98 | if (ssp1601_dyn_init()) return; |
| 99 | } |
| 100 | |
| 101 | // init ok, setup hooks.. |
| 102 | PicoRead16Hook = PicoSVPRead16; |
| 103 | PicoWrite8Hook = PicoSVPWrite8; |
| 104 | PicoWrite16Hook = PicoSVPWrite16; |
| 105 | PicoDmaHook = PicoSVPDma; |
| 106 | PicoResetHook = PicoSVPReset; |
| 107 | PicoLineHook = PicoSVPLine; |
| 108 | |
| 109 | // save state stuff |
| 110 | svp_states[0].ptr = svp->iram_rom; |
| 111 | svp_states[1].ptr = svp->dram; |
| 112 | svp_states[2].ptr = &svp->ssp1601; |
| 113 | carthw_chunks = svp_states; |
| 114 | } |
| 115 | |