Pico/carthw/svp/svp.c

   1 #include "../../PicoInt.h"
   2
   3 svp_t *svp = NULL;
   4
   5 void PicoSVPInit(void)
   6 {
   7         void *tmp;
   8
   9         elprintf(0xffff, "SVP init");
  10
  11         tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
  12         if (tmp == NULL)
  13         {
  14                 elprintf(EL_STATUS, "OOM for SVP data");
  15                 return;
  16         }
  17
  18         Pico.rom = tmp;
  19         svp = (void *) ((char *)tmp + 0x200000);
  20         memset(svp, 0, sizeof(*svp));
  21
  22         // init ok, setup hooks..
  23         PicoRead16Hook = PicoSVPRead16;
  24         PicoWrite8Hook = PicoSVPWrite8;
  25         PicoWrite16Hook = PicoSVPWrite16;
  26         PicoDmaHook = PicoSVPDma;
  27 }
  28
  29
  30 void PicoSVPReset(void)
  31 {
  32         elprintf(0xffff, "SVP reset");
  33
  34         ssp1601_reset(&svp->ssp1601);
  35 }
  36
  37
  38 int PicoSVPDma(unsigned int source, unsigned short **srcp, unsigned short **limitp)
  39 {
  40         if ((source & 0xfe0000) == 0x300000)
  41         {
  42                 elprintf(EL_VDPDMA|0xffff, "SVP DmaSlow from %06x", source);
  43                 source &= 0x1fffe;
  44                 *srcp = (unsigned short *)(svp->ram + source);
  45                 *limitp = (unsigned short *)(svp->ram + sizeof(svp->ram));
  46                 return 1;
  47         }
  48
  49         return 0;
  50 }
  51