| 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 | #include "compiler.h" |
| 11 | #ifdef __GP2X__ |
| 12 | #include <sys/mman.h> |
| 13 | #endif |
| 14 | |
| 15 | svp_t *svp = NULL; |
| 16 | int PicoSVPCycles = 850; // cycles/line, just a guess |
| 17 | static int svp_dyn_ready = 0; |
| 18 | |
| 19 | /* save state stuff */ |
| 20 | typedef enum { |
| 21 | CHUNK_IRAM = CHUNK_CARTHW, |
| 22 | CHUNK_DRAM, |
| 23 | CHUNK_SSP |
| 24 | } chunk_name_e; |
| 25 | |
| 26 | static carthw_state_chunk svp_states[] = |
| 27 | { |
| 28 | { CHUNK_IRAM, 0x800, NULL }, |
| 29 | { CHUNK_DRAM, sizeof(svp->dram), NULL }, |
| 30 | { CHUNK_SSP, sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc), NULL }, |
| 31 | { 0, 0, NULL } |
| 32 | }; |
| 33 | |
| 34 | |
| 35 | static void PicoSVPReset(void) |
| 36 | { |
| 37 | elprintf(EL_SVP, "SVP reset"); |
| 38 | |
| 39 | memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800); |
| 40 | ssp1601_reset(&svp->ssp1601); |
| 41 | #ifndef PSP |
| 42 | if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready) |
| 43 | ssp1601_dyn_reset(&svp->ssp1601); |
| 44 | #endif |
| 45 | } |
| 46 | |
| 47 | |
| 48 | static void PicoSVPLine(int count) |
| 49 | { |
| 50 | #ifndef PSP |
| 51 | if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready) |
| 52 | ssp1601_dyn_run(PicoSVPCycles * count); |
| 53 | else |
| 54 | #endif |
| 55 | { |
| 56 | ssp1601_run(PicoSVPCycles * count); |
| 57 | svp_dyn_ready = 0; // just in case |
| 58 | } |
| 59 | |
| 60 | // test mode |
| 61 | //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff; |
| 62 | } |
| 63 | |
| 64 | |
| 65 | static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) |
| 66 | { |
| 67 | if (source < Pico.romsize) // Rom |
| 68 | { |
| 69 | source -= 2; |
| 70 | *srcp = (unsigned short *)(Pico.rom + (source&~1)); |
| 71 | *limitp = (unsigned short *)(Pico.rom + Pico.romsize); |
| 72 | return 1; |
| 73 | } |
| 74 | else if ((source & 0xfe0000) == 0x300000) |
| 75 | { |
| 76 | elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len); |
| 77 | source &= 0x1fffe; |
| 78 | source -= 2; |
| 79 | *srcp = (unsigned short *)(svp->dram + source); |
| 80 | *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram)); |
| 81 | return 1; |
| 82 | } |
| 83 | else |
| 84 | elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len); |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | |
| 90 | void PicoSVPInit(void) |
| 91 | { |
| 92 | #ifdef __GP2X__ |
| 93 | int ret; |
| 94 | ret = munmap(tcache, SSP_DRC_SIZE); |
| 95 | printf("munmap tcache: %i\n", ret); |
| 96 | #endif |
| 97 | } |
| 98 | |
| 99 | |
| 100 | static void PicoSVPShutdown(void) |
| 101 | { |
| 102 | #ifdef __GP2X__ |
| 103 | // also unmap tcache |
| 104 | PicoSVPInit(); |
| 105 | #endif |
| 106 | } |
| 107 | |
| 108 | |
| 109 | void PicoSVPStartup(void) |
| 110 | { |
| 111 | void *tmp; |
| 112 | |
| 113 | elprintf(EL_SVP, "SVP init"); |
| 114 | |
| 115 | tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp)); |
| 116 | if (tmp == NULL) |
| 117 | { |
| 118 | elprintf(EL_STATUS|EL_SVP, "OOM for SVP data"); |
| 119 | return; |
| 120 | } |
| 121 | |
| 122 | //PicoOpt &= ~0x20000; |
| 123 | Pico.rom = tmp; |
| 124 | svp = (void *) ((char *)tmp + 0x200000); |
| 125 | memset(svp, 0, sizeof(*svp)); |
| 126 | |
| 127 | #ifdef __GP2X__ |
| 128 | tmp = mmap(tcache, SSP_DRC_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0); |
| 129 | printf("mmap tcache: %p, asked %p\n", tmp, tcache); |
| 130 | #endif |
| 131 | |
| 132 | // init SVP compiler |
| 133 | svp_dyn_ready = 0; |
| 134 | #ifndef PSP |
| 135 | if (PicoOpt&POPT_EN_SVP_DRC) { |
| 136 | if (ssp1601_dyn_startup()) return; |
| 137 | svp_dyn_ready = 1; |
| 138 | } |
| 139 | #endif |
| 140 | |
| 141 | // init ok, setup hooks.. |
| 142 | PicoRead16Hook = PicoSVPRead16; |
| 143 | PicoWrite8Hook = PicoSVPWrite8; |
| 144 | PicoWrite16Hook = PicoSVPWrite16; |
| 145 | PicoDmaHook = PicoSVPDma; |
| 146 | PicoResetHook = PicoSVPReset; |
| 147 | PicoLineHook = PicoSVPLine; |
| 148 | PicoCartUnloadHook = PicoSVPShutdown; |
| 149 | |
| 150 | // save state stuff |
| 151 | svp_states[0].ptr = svp->iram_rom; |
| 152 | svp_states[1].ptr = svp->dram; |
| 153 | svp_states[2].ptr = &svp->ssp1601; |
| 154 | carthw_chunks = svp_states; |
| 155 | PicoAHW |= PAHW_SVP; |
| 156 | } |
| 157 | |
| 158 | |