Pico/carthw/svp/svp.c

   1 #include "../../PicoInt.h"
   2
   3 svp_t *svp = NULL;
   4
   5 static void PicoSVPReset(void)
   6 {
   7         elprintf(EL_SVP, "SVP reset");
   8
   9         memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
  10         ssp1601_reset(&svp->ssp1601);
  11 }
  12
  13
  14 static void PicoSVPLine(void)
  15 {
  16         // ???
  17         // OSC_NTSC / 3.0 / 60.0 / 262.0 ~= 1139
  18         // OSC_PAL  / 3.0 / 50.0 / 312.0 ~= 1137
  19         ssp1601_run(800);
  20
  21         // test mode
  22         //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
  23 }
  24
  25
  26 static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
  27 {
  28         if ((source & 0xfe0000) == 0x300000)
  29         {
  30                 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
  31                 source &= 0x1fffe;
  32                 source -= 2;
  33                 *srcp = (unsigned short *)(svp->dram + source);
  34                 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
  35                 return 1;
  36         }
  37         else
  38                 elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
  39
  40         return 0;
  41 }
  42
  43
  44 void PicoSVPInit(void)
  45 {
  46         void *tmp;
  47
  48         elprintf(EL_SVP, "SVP init");
  49
  50         tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
  51         if (tmp == NULL)
  52         {
  53                 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
  54                 return;
  55         }
  56
  57         Pico.rom = tmp;
  58         svp = (void *) ((char *)tmp + 0x200000);
  59         memset(svp, 0, sizeof(*svp));
  60
  61         // init ok, setup hooks..
  62         PicoRead16Hook = PicoSVPRead16;
  63         PicoWrite8Hook = PicoSVPWrite8;
  64         PicoWrite16Hook = PicoSVPWrite16;
  65         PicoDmaHook = PicoSVPDma;
  66         PicoResetHook = PicoSVPReset;
  67         PicoLineHook = PicoSVPLine;
  68 }
  69