Pico/carthw/svp/svp.c

   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 = 820; // 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         if ((PicoOpt&0x20000) && svp_dyn_ready)
  42                 ssp1601_dyn_reset(&svp->ssp1601);
  43 }
  44
  45
  46 static void PicoSVPLine(int count)
  47 {
  48         if ((PicoOpt&0x20000) && svp_dyn_ready)
  49                 ssp1601_dyn_run(PicoSVPCycles * count);
  50         else {
  51                 ssp1601_run(PicoSVPCycles * count);
  52                 svp_dyn_ready = 0; // just in case
  53         }
  54
  55         // test mode
  56         //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
  57 }
  58
  59
  60 static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
  61 {
  62         if (source < Pico.romsize) // Rom
  63         {
  64                 source -= 2;
  65                 *srcp = (unsigned short *)(Pico.rom + (source&~1));
  66                 *limitp = (unsigned short *)(Pico.rom + Pico.romsize);
  67                 return 1;
  68         }
  69         else if ((source & 0xfe0000) == 0x300000)
  70         {
  71                 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
  72                 source &= 0x1fffe;
  73                 source -= 2;
  74                 *srcp = (unsigned short *)(svp->dram + source);
  75                 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
  76                 return 1;
  77         }
  78         else
  79                 elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
  80
  81         return 0;
  82 }
  83
  84
  85 void PicoSVPInit(void)
  86 {
  87 #ifdef __GP2X__
  88         int ret;
  89         ret = munmap(tcache, SSP_DRC_SIZE);
  90         printf("munmap tcache: %i\n", ret);
  91 #endif
  92 }
  93
  94
  95 static void PicoSVPShutdown(void)
  96 {
  97 #ifdef __GP2X__
  98         // also unmap tcache
  99         PicoSVPInit();
 100 #endif
 101 }
 102
 103
 104 void PicoSVPStartup(void)
 105 {
 106         void *tmp;
 107
 108         elprintf(EL_SVP, "SVP init");
 109
 110         tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
 111         if (tmp == NULL)
 112         {
 113                 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
 114                 return;
 115         }
 116
 117         //PicoOpt &= ~0x20000;
 118         Pico.rom = tmp;
 119         svp = (void *) ((char *)tmp + 0x200000);
 120         memset(svp, 0, sizeof(*svp));
 121
 122 #ifdef __GP2X__
 123         tmp = mmap(tcache, SSP_DRC_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
 124         printf("mmap tcache: %p, asked %p\n", tmp, tcache);
 125 #endif
 126
 127         // init SVP compiler
 128         svp_dyn_ready = 0;
 129         if (PicoOpt&0x20000) {
 130                 if (ssp1601_dyn_startup()) return;
 131                 svp_dyn_ready = 1;
 132         }
 133
 134         // init ok, setup hooks..
 135         PicoRead16Hook = PicoSVPRead16;
 136         PicoWrite8Hook = PicoSVPWrite8;
 137         PicoWrite16Hook = PicoSVPWrite16;
 138         PicoDmaHook = PicoSVPDma;
 139         PicoResetHook = PicoSVPReset;
 140         PicoLineHook = PicoSVPLine;
 141         PicoCartUnloadHook = PicoSVPShutdown;
 142
 143         // save state stuff
 144         svp_states[0].ptr = svp->iram_rom;
 145         svp_states[1].ptr = svp->dram;
 146         svp_states[2].ptr = &svp->ssp1601;
 147         carthw_chunks = svp_states;
 148 }
 149
 150