Pico/carthw/svp/svp.c

   1 #include "../../PicoInt.h"
   2
   3 svp_t *svp = NULL;
   4 int PicoSVPCycles = 800; // cycles/line
   5
   6 static void PicoSVPReset(void)
   7 {
   8         elprintf(EL_SVP, "SVP reset");
   9
  10         memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
  11         ssp1601_reset(&svp->ssp1601);
  12 }
  13
  14
  15 static void PicoSVPLine(int count)
  16 {
  17         // ???
  18         // OSC_NTSC / 3.0 / 60.0 / 262.0 ~= 1139
  19         // OSC_PAL  / 3.0 / 50.0 / 312.0 ~= 1137
  20         ssp1601_run(PicoSVPCycles * count);
  21
  22         // test mode
  23         //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
  24 }
  25
  26
  27 static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
  28 {
  29         if ((source & 0xfe0000) == 0x300000)
  30         {
  31                 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
  32                 source &= 0x1fffe;
  33                 source -= 2;
  34                 *srcp = (unsigned short *)(svp->dram + source);
  35                 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
  36                 return 1;
  37         }
  38         else
  39                 elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
  40
  41         return 0;
  42 }
  43
  44
  45 void PicoSVPInit(void)
  46 {
  47         void *tmp;
  48
  49         elprintf(EL_SVP, "SVP init");
  50
  51         tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
  52         if (tmp == NULL)
  53         {
  54                 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
  55                 return;
  56         }
  57
  58         Pico.rom = tmp;
  59         svp = (void *) ((char *)tmp + 0x200000);
  60         memset(svp, 0, sizeof(*svp));
  61
  62         // init ok, setup hooks..
  63         PicoRead16Hook = PicoSVPRead16;
  64         PicoWrite8Hook = PicoSVPWrite8;
  65         PicoWrite16Hook = PicoSVPWrite16;
  66         PicoDmaHook = PicoSVPDma;
  67         PicoResetHook = PicoSVPReset;
  68         PicoLineHook = PicoSVPLine;
  69 }
  70