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 "../../pico_int.h"
  10 #include "compiler.h"
  11 #if defined(__linux__) && defined(ARM)
  12 #include <sys/mman.h>
  13 #endif
  14
  15 svp_t *svp = NULL;
  16 int PicoSVPCycles = 850; // cycles/line, just a guess
  17 static int svp_dyn_ready = 0;
  18
  19 /* save state stuff */
  20 typedef enum {
  21         CHUNK_IRAM = CHUNK_CARTHW,
  22         CHUNK_DRAM,
  23         CHUNK_SSP
  24 } chunk_name_e;
  25
  26 static carthw_state_chunk svp_states[] =
  27 {
  28         { CHUNK_IRAM, 0x800,                 NULL },
  29         { CHUNK_DRAM, sizeof(svp->dram),     NULL },
  30         { CHUNK_SSP,  sizeof(svp->ssp1601) - sizeof(svp->ssp1601.drc),  NULL },
  31         { 0,          0,                     NULL }
  32 };
  33
  34
  35 static void PicoSVPReset(void)
  36 {
  37         elprintf(EL_SVP, "SVP reset");
  38
  39         memcpy(svp->iram_rom + 0x800, Pico.rom + 0x800, 0x20000 - 0x800);
  40         ssp1601_reset(&svp->ssp1601);
  41 #ifndef PSP
  42         if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready)
  43                 ssp1601_dyn_reset(&svp->ssp1601);
  44 #endif
  45 }
  46
  47
  48 static void PicoSVPLine(void)
  49 {
  50         int count = 1;
  51 #if defined(ARM) || defined(PSP)
  52         // performance hack
  53         static int delay_lines = 0;
  54         delay_lines++;
  55         if ((Pico.m.scanline&0xf) != 0xf && Pico.m.scanline != 261 && Pico.m.scanline != 311)
  56                 return;
  57         count = delay_lines;
  58         delay_lines = 0;
  59 #endif
  60
  61 #ifndef PSP
  62         if ((PicoOpt&POPT_EN_SVP_DRC) && svp_dyn_ready)
  63                 ssp1601_dyn_run(PicoSVPCycles * count);
  64         else
  65 #endif
  66         {
  67                 ssp1601_run(PicoSVPCycles * count);
  68                 svp_dyn_ready = 0; // just in case
  69         }
  70
  71         // test mode
  72         //if (Pico.m.frame_count == 13) PicoPad[0] |= 0xff;
  73 }
  74
  75
  76 static int PicoSVPDma(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp)
  77 {
  78         if (source < Pico.romsize) // Rom
  79         {
  80                 source -= 2;
  81                 *srcp = (unsigned short *)(Pico.rom + (source&~1));
  82                 *limitp = (unsigned short *)(Pico.rom + Pico.romsize);
  83                 return 1;
  84         }
  85         else if ((source & 0xfe0000) == 0x300000)
  86         {
  87                 elprintf(EL_VDPDMA|EL_SVP, "SVP DmaSlow from %06x, len=%i", source, len);
  88                 source &= 0x1fffe;
  89                 source -= 2;
  90                 *srcp = (unsigned short *)(svp->dram + source);
  91                 *limitp = (unsigned short *)(svp->dram + sizeof(svp->dram));
  92                 return 1;
  93         }
  94         else
  95                 elprintf(EL_VDPDMA|EL_SVP|EL_ANOMALY, "SVP FIXME unhandled DmaSlow from %06x, len=%i", source, len);
  96
  97         return 0;
  98 }
  99
 100
 101 void PicoSVPInit(void)
 102 {
 103 #if defined(__linux__) && defined(ARM)
 104         int ret;
 105         ret = munmap(tcache, SSP_DRC_SIZE);
 106         printf("munmap tcache: %i\n", ret);
 107 #endif
 108 }
 109
 110
 111 static void PicoSVPShutdown(void)
 112 {
 113 #if defined(__linux__) && defined(ARM)
 114         // also unmap tcache
 115         PicoSVPInit();
 116 #endif
 117 }
 118
 119
 120 void PicoSVPStartup(void)
 121 {
 122         void *tmp;
 123
 124         elprintf(EL_STATUS, "SVP startup");
 125
 126         tmp = realloc(Pico.rom, 0x200000 + sizeof(*svp));
 127         if (tmp == NULL)
 128         {
 129                 elprintf(EL_STATUS|EL_SVP, "OOM for SVP data");
 130                 return;
 131         }
 132
 133         //PicoOpt &= ~0x20000;
 134         Pico.rom = tmp;
 135         svp = (void *) ((char *)tmp + 0x200000);
 136         memset(svp, 0, sizeof(*svp));
 137
 138 #if defined(__linux__) && defined(ARM)
 139         tmp = mmap(tcache, SSP_DRC_SIZE, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_SHARED|MAP_ANONYMOUS, -1, 0);
 140         printf("mmap tcache: %p, asked %p\n", tmp, tcache);
 141 #endif
 142
 143         // init SVP compiler
 144         svp_dyn_ready = 0;
 145 #ifndef PSP
 146         if (PicoOpt&POPT_EN_SVP_DRC) {
 147                 if (ssp1601_dyn_startup()) return;
 148                 svp_dyn_ready = 1;
 149         }
 150 #endif
 151
 152         // init ok, setup hooks..
 153         PicoCartMemSetup = PicoSVPMemSetup;
 154         PicoDmaHook = PicoSVPDma;
 155         PicoResetHook = PicoSVPReset;
 156         PicoLineHook = PicoSVPLine;
 157         PicoCartUnloadHook = PicoSVPShutdown;
 158
 159         // save state stuff
 160         svp_states[0].ptr = svp->iram_rom;
 161         svp_states[1].ptr = svp->dram;
 162         svp_states[2].ptr = &svp->ssp1601;
 163         carthw_chunks = svp_states;
 164         PicoAHW |= PAHW_SVP;
 165 }
 166
 167