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 = 1000; // cycles/line
  17
  18 /* save state stuff */
  19 typedef enum {
  20         CHUNK_IRAM = CHUNK_CARTHW,
  21         CHUNK_DRAM,
  22         CHUNK_SSP
  23 } chunk_name_e;
  24
  25 static carthw_state_chunk svp_states[] =
  26 {
  27         { CHUNK_IRAM, 0x800,                 NULL },
  28         { CHUNK_DRAM, sizeof(svp->dram),     NULL },
  29         { CHUNK_SSP,  sizeof(svp->ssp1601),  NULL },
  30         { 0,          0,                     NULL }
  31 };
  32
  33
  34 static void PicoSVPReset(void)
  35 {
  36         elprintf(EL_SVP, "SVP reset");
  37
  38         memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
  39         ssp1601_reset(&svp->ssp1601);
  40         if (!(PicoOpt&0x20000))
  41                 ssp1601_dyn_reset(&svp->ssp1601);
  42 }
  43
  44
  45 static void PicoSVPLine(int count)
  46 {
  47         if (PicoOpt&0x20000)
  48                 ssp1601_run(PicoSVPCycles * count);
  49         else
  50                 ssp1601_dyn_run(PicoSVPCycles * count);
  51
  52         // test mode
  53         //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
  54 }
  55
  56
  57 static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
  58 {
  59         if (source < Pico.romsize) // Rom
  60         {
  61                 source -= 2;
  62                 *srcp = (unsigned short *)(Pico.rom + (source&~1));
  63                 *limitp = (unsigned short *)(Pico.rom + Pico.romsize);
  64                 return 1;
  65         }
  66         else if ((source & 0xfe0000) == 0x300000)
  67         {
  68                 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
  69                 source &= 0x1fffe;
  70                 source -= 2;
  71                 *srcp = (unsigned short *)(svp->dram + source);
  72                 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
  73                 return 1;
  74         }
  75         else
  76                 elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
  77
  78         return 0;
  79 }
  80
  81
  82 void PicoSVPInit(void)
  83 {
  84 #ifdef __GP2X__
  85         int ret;
  86         ret = munmap(tcache, TCACHE_SIZE);
  87         printf("munmap tcache: %i\n", ret);
  88 #endif
  89 }
  90
  91
  92 static void PicoSVPShutdown(void)
  93 {
  94 #ifdef __GP2X__
  95         // also unmap tcache
  96         PicoSVPInit();
  97 #endif
  98 }
  99
 100
 101 void PicoSVPStartup(void)
 102 {
 103         void *tmp;
 104
 105         elprintf(EL_SVP, "SVP init");
 106
 107         tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
 108         if (tmp == NULL)
 109         {
 110                 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
 111                 return;
 112         }
 113
 114         Pico.rom = tmp;
 115         svp = (void *) ((char *)tmp + 0x200000);
 116         memset(svp, 0, sizeof(*svp));
 117
 118 #ifdef __GP2X__
 119         tmp = mmap(tcache, TCACHE_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
 120         printf("mmap tcache: %p, asked %p\n", tmp, tcache);
 121 #endif
 122
 123         // init SVP compiler
 124         if (!(PicoOpt&0x20000)) {
 125                 if (ssp1601_dyn_startup()) return;
 126         }
 127
 128         // init ok, setup hooks..
 129         PicoRead16Hook = PicoSVPRead16;
 130         PicoWrite8Hook = PicoSVPWrite8;
 131         PicoWrite16Hook = PicoSVPWrite16;
 132         PicoDmaHook = PicoSVPDma;
 133         PicoResetHook = PicoSVPReset;
 134         PicoLineHook = PicoSVPLine;
 135         PicoCartUnloadHook = PicoSVPShutdown;
 136
 137         // save state stuff
 138         svp_states[0].ptr = svp->iram_rom;
 139         svp_states[1].ptr = svp->dram;
 140         svp_states[2].ptr = &svp->ssp1601;
 141         carthw_chunks = svp_states;
 142 }
 143
 144