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
  22
  23 static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
  24 {
  25         if ((source & 0xfe0000) == 0x300000)
  26         {
  27                 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
  28                 source &= 0x1fffe;
  29                 source -= 2;
  30                 *srcp = (unsigned short *)(svp->dram + source);
  31                 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
  32                 return 1;
  33         }
  34
  35         return 0;
  36 }
  37
  38
  39 void PicoSVPInit(void)
  40 {
  41         void *tmp;
  42
  43         elprintf(EL_SVP, "SVP init");
  44
  45         tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
  46         if (tmp == NULL)
  47         {
  48                 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
  49                 return;
  50         }
  51
  52         Pico.rom = tmp;
  53         svp = (void *) ((char *)tmp + 0x200000);
  54         memset(svp, 0, sizeof(*svp));
  55
  56         // init ok, setup hooks..
  57         PicoRead16Hook = PicoSVPRead16;
  58         PicoWrite8Hook = PicoSVPWrite8;
  59         PicoWrite16Hook = PicoSVPWrite16;
  60         PicoDmaHook = PicoSVPDma;
  61         PicoResetHook = PicoSVPReset;
  62         PicoLineHook = PicoSVPLine;
  63 }
  64